JP2021064015A - Colored composition for color filter, color filter and display device - Google Patents

Abstract

To provide a colored composition for a color filter, which achieves reduction in film thickness of a color filter, induces little parallax color mixing and shows excellent color reproducibility of pixels, and the like, to provide a colored composition for a color filter using a coloring material dispersion that can disperse a coloring material in a good state upon producing a colored layer and that is less likely to deteriorate with time, and to provide a colored composition for a color filter, which gives little development residue and is less likely to cause water stains.SOLUTION: The colored composition for a color filter comprises a coloring material, a solvent, a polymerization initiator and an alkali-soluble resin. The total mass of calcium (Ca) and iron (Fe) contained in the colored composition is 120 ppm by mass or less with respect to the whole colored composition. The alkali-soluble resin has a hydrocarbon ring. A color filter using the above colored composition is also provided.SELECTED DRAWING: None

Description

The present invention relates to a coloring composition for a color filter, and more specifically, a coloring composition for a color filter, which defines the total content of a specific metal element and contains an alkali-soluble resin having a hydrocarbon ring, and a coloring composition for a color filter. It relates to the color filter obtained by using them.
When producing a coloring composition for a color filter, a coloring material liquid is used. In the present specification, a "color material dispersion" in which a color material such as a pigment or a dye is dispersed in a solvent and a "color material solution" in which a color material such as a dye is dissolved in a solvent. Are collectively called "color material liquid".

A color filter used for a display or the like generally has a transparent substrate, a colored layer, a light-shielding portion, and the like, and examples of the method for forming the colored layer include a pigment dispersion method, a dyeing method, an electrodeposition method, and a printing method. Among them, the pigment dispersion method is widely used in terms of spectral characteristics, durability, pattern shape, accuracy, and the like (Patent Documents 1 and 2).

In recent years, with the development of displays, the demand for liquid crystal displays, organic EL displays, etc. has been increasing, and along with this, the performance of these displays has been improved by improving color rendering properties, contrast, brightness, color reproducibility, etc. Is strongly desired.

Furthermore, in recent years, due to the high definition of tablets, smartphones, etc., the black matrix has become thinner, and the phenomenon of parallax mixing, in which the colors of adjacent pixels appear to be mixed when the display is viewed from the side, has become a particular problem. ing.
In order to solve this problem, it is required to reduce the film thickness of the color filter, and specifically, for example, it is required to achieve a film thickness of about 50% to 70% of the conventional film thickness.
On the other hand, as for the reproduction color of the pixel, high color rendering in the chromaticity range defined as "adobe RGB standard" and "DCI standard"("DCI" is Digital Cinema Initiatives) is required.

Therefore, in order to reduce the film thickness of the color filter and increase the color rendering of the pixels, it is necessary to increase the density of the coloring material of the coloring composition for the color filter.

However, if an attempt is made to increase the colorant concentration of the coloring composition for a color filter or the coloring material liquid used therein, it becomes difficult to disperse and dissolve the coloring material well in the first place, and stability over time cannot be obtained. There was a case.
Further, as the density of the coloring material increases, the components required for patterning to form pixels are relatively reduced, and good developability cannot be obtained (development speed is low; development residue is large; etc.). was there.

That is, even if a coloring composition for a color filter that can be dispersed and dissolved at a high concentration and has excellent color performance can be produced, there has been a problem that it is difficult to achieve both developability at the time of manufacturing a color filter.

On the other hand, Patent Documents 3 to 6 are known as those that specify the content of metal elements in a color filter or a coloring composition for producing a color filter.

Patent Document 3 defines the total amount of ^{sodium ion (Na +} ) and potassium ion (K ⁺ ) contained in the pixels of R (red), G (green), B (blue) and BK (black). As a result, a technique for preventing contamination of a liquid crystal element or a semiconductor element close to a color filter is disclosed.
Patent Document 4 discloses a technique for achieving high shading rate and low surface reflectance by defining the total amount of sodium (Na) and potassium (K) in a resin coated with carbon black for a black matrix. Has been done.

Patent Document 5 describes a pigment dispersion liquid in which the electrical conductivity is specified and the respective contents of sodium (Na), potassium (K), and magnesium (Mg) are specified, and the pigment dispersion liquid is used. The color filter thus obtained is said to have good display stability because it has an excellent voltage holding ratio.
In Patent Document 6, C.I. I. ^{An organic pigment composition for a color filter in which the contents of sodium ion (Na +} ), potassium ion (K ⁺ ), and magnesium ion (Mg ⁺ ) contained in Pigment Green 58 are specified is described, and the organic pigment composition for a color filter is used. The color filter thus obtained is said to have excellent display responsiveness.

However, since the color material liquid for color filters for displays requires extremely high dispersion and dissolution, the above-mentioned technology is not yet sufficient, and further improvement is desired to solve the above-mentioned problems. It was rare.
In particular, high-definition color mixing has become a problem, and high color rendering of pixels has been required. In recent years, it has become necessary to reduce the film thickness of color filters. A coloring composition for a color filter having excellent performance in terms of properties, various image characteristics, developability at the time of producing a color filter, and the like has been desired.

JP-A-2007-133131 JP-A-2009-244617 Japanese Unexamined Patent Publication No. 7-198928 Japanese Unexamined Patent Publication No. 9-07173 JP-A-2009-007432 Japanese Unexamined Patent Publication No. 2014-119487

The present invention has been made in view of the above background technology, and the problems thereof are that the film thickness of the color filter is reduced, the difference color mixing when the display is viewed from the side is small, and the color reproduction of the pixels is also improved. It is an object of the present invention to provide a coloring composition for a color filter having excellent characteristics such as achieving high color rendering in a constant chromaticity range.
In addition, the coloring material of the coloring composition for a color filter can be satisfactorily dispersed and dissolved, and the coloring composition for a color filter is excellent in viscosity stability and developability (high development speed and small amount of development residue). It is to provide things.

As a result of intensive studies to achieve the above object, the present inventor has found that sodium (Na) and potassium (K), which are contained in a color material liquid for a color filter or a coloring composition for a color filter, are extremely common. Metal elements other than metal elements such as "calcium (Ca), iron (Fe)" (hereinafter, the inside of the parentheses may be referred to as "first specific metal element"), "magnesium (Mg), aluminum". (Al), Chromium (Cr) ”(Hereinafter, the inside of the parentheses may be referred to as“ second specific metal element ”. In addition,“ first specific metal element ”and“ second specific metal element ”are collectively referred to. Therefore, it has been found that by reducing the content of "specific metal element"), a coloring composition for a color filter and a color filter in which the above-mentioned problems are unexpectedly solved can be obtained.

In addition, the present inventor has "specified metal elements"("first specified metal elements" and "second specified metals" mixed from solvents, process water, device members, etc. used in the process of manufacturing coloring materials. When there is an "element") (especially when there is a "first specified metal element"), the initial viscosity of the coloring material liquid during the production of the coloring material liquid becomes high, the stability over time becomes poor, and the development time becomes long. , It was found that an appropriate pattern and good pixels could not be obtained.
Then, by reducing the mixing of "specific metal elements" in the coloring materials, solvents, etc., which are the raw materials for the color material liquid for color filters (in particular, the mixing of "specific metal elements" in the coloring materials is reduced. As a result, it has been found that a coloring composition for a color filter and a color filter that solve the above problems can be obtained.

Further, when the coloring composition contains a large amount of the specific metal element, not only the development time becomes long, but also the development residue increases, and water stains are likely to occur. In particular, when the density of the coloring material is high, such a tendency becomes strong.
The present inventor can reduce the amount of development residue and suppress the occurrence of water stains by reducing the mixing of the specific metal element and further using an alkali-soluble resin having a hydrocarbon ring as the alkali-soluble resin. We have found that we can do this, and have completed the present invention.

That is, the present invention is a coloring composition containing a coloring material, a solvent, a polymerization initiator and an alkali-soluble resin, and the total mass of calcium (Ca) and iron (Fe) contained in the coloring composition is the said. Provided is a coloring composition for a color filter, which is 120% by mass or less with respect to the entire coloring composition, and the alkali-soluble resin has a hydrocarbon ring.

The present invention also provides a color filter characterized by having a colored layer which is a cured product of the above-mentioned coloring composition for a color filter.

The present invention also provides a display device having the above-mentioned color filter.

As described above, by avoiding the mixing of extremely common metal elements such as sodium (Na) and potassium (K), contamination of liquid crystal elements and semiconductor elements close to the color filter can be prevented, and the inclusion of the metal in the pigment coating resin. Technology that specifies the amount to achieve high shading rate and low surface reflectance, or specifies the content of the metal in the color filter to increase the voltage retention rate and improve display stability and display responsiveness. Are known.
That is, there are known techniques for reducing common metal elements and improving specific optical and electrical properties that are directly caused by the inclusion of the metal.

However, the content of the specific metal element (particularly, the first specific metal element) is defined, and the mode (high concentration, etc.) and physical properties (low viscosity, dispersion stability, etc.) are determined at the stage of the coloring material liquid. There is no known technique for improving and using it to finally obtain a good color filter.

That is, by defining the content of "calcium (Ca), iron (Fe)" (first specific metal element), further, "magnesium (Mg), aluminum (Al), chromium (Cr)" (the first (Ii) By specifying the content of (specific metal element), a color material solution with low viscosity (appropriate viscosity) and excellent dispersion stability and solubility can be obtained even at a high color material concentration, and as a result, image characteristics and image characteristics can be obtained. It is not known that a color filter having excellent development characteristics can be obtained.

In recent years, in order to solve the above-mentioned problems, it has been required to reduce the film thickness of the color filter, and on the other hand, the reproduction color of the pixel is also required to have high color performance in a certain chromaticity range. By using a coloring composition for a filter, a lowering of the film thickness of the color filter is achieved, less parallax color mixing is achieved, high color performance is achieved, and a coloring composition for a color filter and a color filter having excellent developability in patterning are provided. can do.

Hereinafter, the present invention will be described, but the present invention is not limited to the following specific forms, and can be arbitrarily modified within the scope of the technical idea.

The "coloring composition for a color filter" of the present invention is a coloring composition containing a coloring material, a solvent, a polymerization initiator and an alkali-soluble resin, and contains calcium (Ca) and iron (Fe) contained in the coloring composition. ) Is 120 mass ppm or less with respect to the entire coloring composition.
For example, a color filter color material liquid containing a color material and a solvent and having a total mass of calcium (Ca) and iron (Fe) of 180 mass ppm or less with respect to the entire color material liquid for the color filter is used. This makes it easy to prepare a coloring composition for a color filter in which the total mass of calcium (Ca) and iron (Fe) is within such a range.
In the present invention, "color material liquid for color filter" may be simply abbreviated as "color material liquid", and "coloring composition for color filter" may be simply abbreviated as "coloring composition". is there.

<Color material>
In the present invention, the coloring material may be any material capable of developing a desired color when the colored layer of the color filter is formed, and is not particularly limited, and examples thereof include various inorganic pigments, organic pigments, dyes, and the like. May be used alone or in combination of two or more.
Among them, organic pigments are preferably used because they have high color development and high heat resistance.

<< Inorganic pigment >>
Specific examples of the inorganic pigment used in the present invention include titanium oxide, barium sulfate, calcium carbonate, zinc white, lead sulfate, yellow lead, zinc yellow, red iron oxide (III), cadmium red, ultramarine blue, and dark blue. , Chromium oxide green, cobalt green, amber, titanium black, synthetic iron black, carbon black and the like.

<< Organic Pigments >>
The organic pigment used in the present invention is a coloring pigment (including an achromatic pigment such as black), and is not particularly limited as long as it can develop a desired color as an organic pigment for a color filter. Here, "for the color filter" includes all for coloring the color filter, such as for the pixel portion and the black matrix portion.

Further, as the organic pigment used in the present invention, a rake pigment that can be dispersed by binding various substituents to a dye or insolubilizing it in a solvent by using a known rake formation (chlorination) method. Can also be mentioned.

Here, the organic pigments include achromatic pigments such as white, black, and gray, and specifically, blue pigments, green pigments, red pigments, yellow pigments, purple pigments, orange pigments, brown pigments, and black pigments. Pigments of various colors such as pigments can be used.
Since the pigment dispersion liquid in the present invention is used as a color filter material, it is mainly a blue pigment, a green pigment, a red pigment, and a black pigment. Is also used.
Among the above, blue pigments, green pigments, red pigments, yellow pigments, purple pigments and the like are preferable from the viewpoint of exhibiting the above-mentioned effects of the present invention.

Specific examples of organic pigments are shown below by pigment numbers. The following "CI" means a color index.

Examples of the red pigment include C.I. I. Pigment Red 1, 2, 3, 4, 5, 6, 7, 8, 9, 12, 14, 15, 16, 17, 21, 22, 23, 31, 32, 37, 38, 41, 47, 48, 48: 1, 48: 2, 48: 3, 48: 4, 49, 49: 1, 49: 2, 50: 1, 52: 1, 52: 2, 53, 53: 1, 53: 2, 53: 3, 57, 57: 1, 57: 2, 58: 4, 60, 63, 63: 1, 63: 2, 64, 64: 1, 68, 69, 81, 81: 1, 81: 2, 81: 3, 81: 4, 83, 88, 90: 1, 101, 101: 1, 104, 108, 108: 1, 109, 112, 113, 114, 122, 123, 144, 146, 147, 149, 151, 166, 168, 169, 170, 172, 173, 174, 175, 176, 177, 178, 179, 181, 184, 185, 187, 188, 190, 193, 194, 200, 202, 206, 207, 208, 209, 210, 214, 216, 220, 221, 224, 230, 231, 232, 233, 235, 236, 237, 238, 239, 242, 243, 245, 247, 249, 250, 251, 253, 254, 255, 256, 257, 258, 259, 260, 262, 263, 264, 265, 266, 267, 268, 269, 270, 271, 272, 273, 274, 275, 276 and the like.
Among these, preferably, C.I. I. Pigment Red 48: 1, 122, 168, 177, 202, 206, 207, 209, 224, 242, 254 and the like, and C.I. I. Pigment Red 177, 209, 224, 254 and the like.

Examples of the blue pigment include C.I. I. Pigment Blue 1, 1: 2, 9, 14, 15, 15: 1, 15: 2, 15: 3, 15: 4, 15: 6, 16, 17, 19, 25, 27, 28, 29, 33, 35, 36, 56, 56: 1, 60, 61, 61: 1, 62, 63, 66, 67, 68, 71, 72, 73, 74, 75, 76, 78, 79 and the like can be mentioned.
Among these, preferably, C.I. I. Pigment Blue 15, 15: 1, 15: 2, 15: 3, 15: 4, 15: 6, and the like, and C.I. I. Pigment blue 15: 6 and the like.

Examples of the green pigment include C.I. I. Pigment Greens 1, 2, 4, 7, 8, 10, 13, 14, 15, 17, 18, 19, 26, 36, 45, 48, 50, 51, 54, 55, 58, 59 and the like.
Among these, preferably, C.I. I. Pigment Green 7, 36, 58, 59 and the like.

Examples of the yellow pigment include C.I. I. Pigment Yellow 1, 1: 1, 2, 3, 4, 5, 6, 9, 10, 12, 13, 14, 16, 17, 24, 31, 32, 34, 35, 35: 1, 36, 36: 1,37,37: 1,40,41,42,43,48,53,55,61,62,62: 1,63,65,73,74,75,81,83,87,93,94, 95, 97, 100, 101, 104, 105, 108, 109, 110, 111, 116, 117, 119, 120, 126, 127, 127: 1, 128, 129, 133, 134, 136, 138, 139, 142, 147, 148, 150, 151, 153, 154, 155, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 172, 173, 174, 175, 176, 180, 181, 182, 183, 184, 185, 188, 189, 190, 191, 191: 1, 192, 193, 194, 195, 196, 197, 198, 199, 200, 202, 203, 204, 205, 206, 207, 208, 213 and the like can be mentioned.
Among these, preferably C.I. I. Pigment Yellow 83, 117, 129, 138, 139, 150, 154, 155, 180, 185, 213 and the like, and C.I. I. Pigment Yellow 83, 138, 139, 150, 180, 185 and the like.

Examples of the orange pigment include C.I. I. Pigment Orange 1, 2, 5, 13, 16, 17, 19, 20, 21, 22, 23, 24, 34, 36, 38, 39, 43, 46, 48, 49, 61, 62, 64, 65, 67, 68, 69, 70, 71, 72, 73, 74, 75, 77, 78, 79 and the like can be mentioned.
Among these, preferably, C.I. I. Pigment Orange 38, 71 and the like.

As the purple pigment, C.I. I. Pigment Violet 1, 1: 1, 2, 2: 2, 3, 3: 1, 3: 3, 5, 5: 1, 14, 15, 16, 19, 23, 25, 27, 29, 31, 32, Examples thereof include 37, 39, 42, 44, 47, 49 and 50.
Among these, preferably C.I. I. Pigment Violet 19, 23 and the like, with particular preference being C.I. I. Pigment Violet 23 and the like.

In the present invention, one type of the above pigment may be used, or two or more types may be used.
Further, when the color material liquid in the present invention is a color material liquid for a black matrix of a color filter, a black pigment can be used as the color material.
Examples of the black pigment include carbon black.
Further, the achromatic organic pigment such as black may be the achromatic pigment alone or may be mixed with a coloring pigment such as red, green or blue.

From the viewpoint of chemical structure and light transmission spectrum, preferred organic pigments in the present invention are anthraquinone pigments such as Pigment Red 177; diketopyrrolopyrrole pigments such as Pigment Red 254; and azomethine pigments such as Pigment Yellow 150. Azo pigments such as Pigment Yellow 138; Dioxazine pigments such as Pigment Violet 23; Phthalocyanine pigments such as Pigment Blue 15: 6; Benzimidazolone pigments such as Pigment Yellow 180; Kinoxalin pigments such as Pigment Yellow 213; Kinacridone Pigments; isoindolin pigments; isoindolinone pigments; indanslen pigments; perylene pigments; and the like.

In particular, from the viewpoint of exhibiting the effects of the present invention, the organic pigment (coloring material) is one or more selected from the group consisting of anthraquinone pigments, diketopyrrolopyrrole pigments, azo pigments, quinophthalone pigments, dioxazine pigments and phthalocyanine pigments. It is particularly preferable that it is an organic pigment.

In the present invention, one kind or two or more kinds of organic pigments (coloring materials) having the same chemical structure skeleton, that is, the same system may be used in the system. Further, two or more kinds may be used across the system. It may also be a mixed crystal.

Since organic pigments having the above-mentioned chemical structure are often used as organic pigments (coloring materials) for color filters, a coloring material dispersion liquid having a high concentration is often required, and dispersibility by a specific metal element is required. In addition, since the specific metal element is likely to be mixed in the manufacturing process, the above-mentioned effect of the present invention is particularly likely to be exhibited.
Specifically, for example, Pigment Red 254, Pigment Red 177, Pigment Yellow 150, Pigment Yellow 185, Pigment Yellow 138, Pigment Yellow 139, Pigment Blue 15: 6, Pigment Violet 23, Pigment Green 58 or Pigment Green 59 are described above. Especially preferred for reasons.

Further, as the organic pigment in the present invention, a rake pigment in which the dye is insolubilized by using a known rake formation (chlorination) method can also be used.
The dye used as a raw material for the rake pigment can be appropriately selected from conventionally known dyes. Examples of such dyes include azo dyes, metal complex salt azo dyes, anthraquinone dyes, triphenylmethane dyes, xanthene dyes, cyanine dyes, naphthoquinone dyes, quinoneimine dyes, methine dyes, and phthalocyanine dyes. Examples thereof include dyes, perinone dyes, and dipyrromethene dyes.

Among these, as the dye used as a raw material for the lake pigment, a xanthene dye (xanthene acid dye) is preferable because of its high heat resistance. As the xanthene-based acid dye, it is preferable to have a compound represented by the following general formula (II), that is, a rhodamine-based acid dye.

［一般式（ＩＩ）中、Ｒ^Ｉ〜Ｒ^ＩＶは、それぞれ独立に、水素原子、アルキル基、アリール基、又はヘテロアリール基を表し、Ｒ^ＩとＲ^ＩＩＩ、Ｒ^ＩＩとＲ^ＩＶが結合して環構造を形成してもよい。Ｒ^Ｖは、酸性基、Ｘは、ハロゲン原子を表す。ｍは０〜５の整数を表す。一般式（ＩＩ）は酸性基を１個以上有するものであり、ｎは０以上の整数である。］

[In the general formula ^{(II), R} I ~R ^IV are each independently a hydrogen atom, an alkyl group, an aryl group, or a heteroaryl group, ^{R I} and ^{R III,} by bonding ^{R II} and ^{R IV} A ring structure may be formed. ^RV represents an acidic group and X represents a halogen atom. m represents an integer from 0 to 5. The general formula (II) has one or more acidic groups, and n is an integer of 0 or more. ]

The alkyl group in R ^I to R ^IV is not particularly limited. For example, a linear or branched alkyl group having 1 to 20 carbon atoms which may have a substituent may be mentioned, and among them, a linear or branched alkyl group having 1 to 8 carbon atoms is preferable. , A linear or branched alkyl group having 1 to 5 carbon atoms is more preferable. The substituent that the alkyl group may have is not particularly limited, and examples thereof include an aryl group, a halogen atom, a hydroxyl group and the like, and examples of the substituted alkyl group include a benzyl group and the like, and further, a substituent. It may have a halogen atom or an acidic group.
Aryl group in R ^I to R ^IV is not particularly limited. For example, an aryl group having 6 to 20 carbon atoms which may have a substituent may be mentioned, and among them, a phenyl group and a naphthyl group which may have a substituent are preferable. Heteroaryl groups in R ^I to R ^IV are have a substituent include a heteroaryl group which may 5 to 20 carbon atoms, as a hetero atom, a nitrogen atom, an oxygen atom, a sulfur atom, etc. are preferable.
Examples of the substituent which the aryl group or the heteroaryl group may have include an alkyl group having 1 to 5 carbon atoms, a halogen atom, an acidic group, a hydroxyl group, an alkoxy group, a carbamoyl group, a carboxylic acid ester group and the like. ..
^{Incidentally,} R I ^{to R IV} may be be the same or different.

Specific examples of the acidic group or a salt thereof, a carboxyl group (-COOH), a carboxylato group (-COO ^-), carboxylate (. -COOM, where M is a metal atom), a sulfonato group (-SO ₃ ⁻ ), sulfo group (-SO ₃ H), sulfonic acid base (-SO ₃ M, where M represents a metal atom) and the like, among which sulfonate group (-SO ₃ ⁻ ) and sulfo group It is preferable to have at least one of (-SO ₃ H) or a sulfonic acid base (-SO _{3 M).} Examples of the metal atom M include a sodium atom and a potassium atom.

As the compound represented by the general formula (II), acid red 50, acid red 52, acid red 289, acid violet 9, acid violet 30, acid blue 19 and the like are preferable from the viewpoint of increasing the brightness.
From the viewpoint of heat resistance, a compound having a betaine structure in which m = 1 and n = 0 is preferable in the general formula (II).
Further, among them, m = 1 and n = 0, ^RI and R ^II are independently alkyl groups or aryl groups, respectively, and R ^III and R ^IV are independently aryl groups or heteroaryl groups, respectively. This is preferable from the viewpoint that a colored layer having excellent brightness and light resistance can be formed.
The method for producing the compound represented by the general formula (II) is not particularly limited, and can be obtained by referring to, for example, Japanese Patent Application Laid-Open No. 2010-21198.

As the metal lake coloring material of the xanthene acid dye, a material containing a metal atom is used as a lake agent. By using a rake agent containing a metal atom, the heat resistance of the coloring material is increased. As such a rake agent, a rake agent containing a metal atom that becomes a divalent or higher metal cation is preferable.

As a guide, if the amount of the rake pigment dissolved in 10 g of the solvent (or mixed solvent) is 10 mg or less, the rake pigment (dye) can be dispersed in the solvent (or mixed solvent). Can be determined.

<< Acid dye derivative >>
It is preferable that the organic pigment in the present invention contains an acidic dye derivative because the above-mentioned effect of the present invention can be easily exerted. When an acidic dye derivative is used, it can be finely dispersed, and when used for a color filter, it has high dispersion stability, high contrast, high light transmittance, high brightness, and a coloring material. It is preferable because a dispersion liquid can be obtained.
Further, when the acidic dye derivative is used, the effect of reducing the specific metal element in the present invention is more exerted, and the above effect can be synergistically exerted.

Here, the "acidic dye derivative" refers to a dye derivative having an acidic group in its chemical structure, and is particularly preferably composed of anthraquinone pigment, diketopyrrolopyrrole pigment, azo pigment, quinophthalone pigment, dioxazine pigment and phthalocyanine pigment. A pigment derivative having one or more pigment skeletons selected from the group and having an acidic group.
Among the acidic dye derivatives, the quinophthalone dye derivative, which has a pigment skeleton of a quinophthalone pigment and has an acidic group, is more preferable in terms of improving dispersibility.

As the acidic group of the acidic dye derivative, at least one selected from the group consisting of a sulfo group, a sulfonamide group, a carboxy group, and a metal salt or an ammonium salt of the functional group is preferable.
The average amount of acidic groups introduced into one molecule of the pigment is not particularly limited, but is preferably 0.5 to 5, more preferably 0.6 to 4, and particularly 0.7 to 3.5. preferable.
By introducing an acidic group, fine dispersion becomes possible, and when used for a color filter, a color having advantages such as high dispersion stability, high contrast, high light transmittance, and high brightness. It is preferable because a material dispersion liquid can be obtained, and by reducing the specific metal element, a synergistic effect can be obtained and the effect can be further obtained.

The organic pigment in the present invention preferably contains a pigment and an acidic pigment derivative. The acidic dye derivative interacts with the pigment and is adsorbed or incorporated on the surface of the pigment when the pigment particles are produced.
Further, by adsorbing on the surface of the pigment, the surface of the pigment is acidified, the affinity with the pigment dispersant is enhanced as compared with the organic pigment itself, and the pigment dispersant acts as an intermediary.
Further, the acidic dye derivative that interacts with the basic dispersant is adsorbed on the pigment surface, so that the basic dispersant can be efficiently positioned on the pigment surface. This enables fine dispersion and dispersion stabilization, which is excellent when used for a color filter.

The content of the acidic dye derivative in the whole organic pigment in the present invention is not particularly limited, but is preferably 0.5 to 30 parts by mass and 1 to 15 parts by mass with respect to 100 parts by mass of the pigment. Is more preferable, and 2 to 10 parts by mass is particularly preferable.
When it is set to the above lower limit value or more, stable dispersion and fine dispersion are possible, and a synergistic effect with the above-mentioned reduction of the specific metal element is obtained. Can be suppressed.

In the present invention, as the organic pigment, one kind or two or more kinds of the above acidic dye derivatives may be used, and one kind or two or more kinds of the above acidic dye derivatives may be used for one kind of pigment. Good.

The acidic dye derivative may be added to the dispersion of the pigment particles at any stage, but in consideration of adsorbing or incorporating the acidic dye derivative on the surface of the pigment, a step of producing the pigment. It can also be added to the pigment in the above, for example, during the step of synthesizing the pigment, during the step of solvent salt milling the pigment with a kneader or the like, during the step of the treatment after the step, the pigment is dry-ground with an attritor or the like. It can be added during the process, during the dispersed process, during the process of post-dispersion processing, and the like.
It can be added to a good solvent or a poor solvent in the reprecipitation method, or can be added after the pigment particles are precipitated or when the pigment particles are concentrated or redispersed thereafter.

According to the present invention, further, since the dispersant is a (salt-type) basic block-type dispersant or a (salt-type) basic graft-type dispersant, which will be described later, the salt-forming site thereof is a pigment and particularly. The main chain and side chains of the polymer dispersant, which have strong adsorptivity to acidic dye derivatives adsorbed on the pigment surface and have affinity for solvents, improve the dispersibility of the pigment dispersion for color filters. As a result, the concentration of the organic pigment can be increased, the viscosity can be reduced, the change over time of the pigment dispersion can be suppressed, and as a result, the developability in the evaluation of the coloring composition for a color filter is improved.

<< Dye >>
In the present invention, the dye can also be used as a coloring material. As a specific example of the dye, the same dye as the above-mentioned "dye which is a raw material of a rake pigment" can be used.

As a guide, if the amount of the dye dissolved in 10 g of the solvent (or mixed solvent) is 10 mg or less, the dye can be dispersed in the solvent (or mixed solvent), and the color material dispersion liquid should be used. Can be done.
A dye that dissolves in excess of 10 mg with respect to 10 g of a solvent (or a mixed solvent) can be dissolved in a solvent to form a coloring material solution, which can be used as a coloring composition for a color filter.

<< Particle size of coloring material >>
The particle size of the coloring material is not particularly limited, but is preferably 30 nm to 500 nm, more preferably 40 nm to 300 nm, and particularly preferably 50 nm to 200 nm.
If the particle size is too small, the dispersibility and resolubility are lowered, and the workability may be lowered due to contamination by fine powder and the like.
On the other hand, if the particle size is too large, dispersibility, dispersion stability, light resistance, etc. deteriorate, and the effect of reducing the content of specific metal elements such as calcium (Ca) and iron (Fe) is less likely to appear. The effects of the present invention may not be achieved, and in particular, good contrast may not be obtained.

Here, the "resolubility" means the property that the solid content of the coloring composition for a color filter once dried is dissolved again in the solvent. For example, if a coloring composition for a color filter adheres to the tip of a die lip when coating with a die coater, solidification is generated by drying when the drying speed is high, but the solidified product is colored when coating is resumed. If it is not easily dissolved in the coloring composition for a filter, a part of the solidified substance on the die lip is peeled off and easily adheres to the coloring layer of the color filter, which causes foreign matter defects.

<Dispersant>
The coloring composition for a color filter of the present invention may contain a dispersant, if necessary.
The dispersant in the present invention can be appropriately selected from known dispersants and used, for example, cationic, anionic, nonionic, amphoteric, silicone-based, fluorine-based and other surfactants; polymers. Dispersant; A low molecular weight dispersant or the like can be used. Of these, polymer dispersants (including polymer surfactants) are preferable because they can be dispersed uniformly and finely.

Examples of the polymer dispersant include polymer dispersants such as modified polyurethane, modified polyacrylate, modified polyester, and modified polyamide.
Specifically, (co) polymers of "unsaturated carboxylic acid ester such as (meth) acrylic acid ester"; (part) of "(co) polymer of unsaturated carboxylic acid such as (meth) acrylic acid" ) Amine salts, (partial) ammonium salts or (partial) alkylamine salts; (co) polymers of "unsaturated carboxylic acid esters such as (meth) acrylic acid esters with primary, secondary or tertiary amino groups" , A (partial) salt of the amino group of the (co) polymer, a (partial) acid-modified product of the amino group of the (co) polymer; (Co) polymers of "esters" and their modifications; polyurethanes; unsaturated polyamides; polysiloxanes; long-chain polyaminoamide phosphates; by reaction of poly (lower alkyleneimines) with free carboxy group-containing polyesters The obtained amides and salts thereof; and the like can be mentioned.

<< Polymer Dispersant and Low Molecular Dispersant >>
The "dispersant" in the present invention is not particularly limited, and a known polymer dispersant or low molecular dispersant can be used to disperse the coloring material.

Examples of the polymer dispersant include a random dispersant composed of a random (co) polymer; a block dispersant composed of a block copolymer; and a pendant as a side chain in places with respect to the main chain (like a branch). ) A graft-type dispersant composed of a graft (co) polymer or the like to which a repeating unit is bonded; and the like.
Further, a salt-type dispersant in which at least a part of the constituent units of the (co) polymer has a salt structure is also preferable. Such a salt type applies to all of the above random type dispersants, block type dispersants and graft type dispersants, and they are preferably used.

Examples of the polymer dispersant include (co) polymers of unsaturated carboxylic acid esters such as poly (meth) acrylic acid ester; and (co) polymers of unsaturated carboxylic acid such as poly (meth) acrylic acid. (Partial) amine salts, (partial) ammonium salts and (partial) alkylamine salts; (co) polymers of hydroxyl group-containing unsaturated carboxylic acid esters such as hydroxyl group-containing poly (meth) acrylic acid esters and their modifications; polyurethanes Unsaturated polyamides; Polysiloxanes; Long-chain polyaminoamide phosphates; Amides obtained by the reaction of poly (lower alkyleneimine) with free carboxy group-containing polyesters, salts thereof, and polyester groups on the side chains ( Meta) acrylate copolymers and the like can be mentioned.

Among them, poly (meth) acrylate, sodium maleate-olefin copolymer, terminal carboxy group-containing polyester (for example, Japanese Patent Publication No. 54-34009, etc.); tetrakis (2-hydroxyalkyl) ethylenediamine is used as a starting material. Polyester having an acidic group and / or a basic group (Japanese Patent Laid-Open No. 2-245231, etc.); Macromonomer (oligomer having a polymerizable unsaturated group at one end), a monomer having a hydroxyl group, and a monomer containing a carboxy group are copolymerized. (Japanese Patent Laid-Open No. 8-259876, etc.); A copolymer obtained by copolymerizing a macromonomer (an oligomer having a polymerizable unsaturated group at one end) and a monomer having a nitrogen atom (Japanese Patent Laid-Open No. 8). 10-339949 (No. 10-339949, etc.)) and the like are preferable.

Examples of the low molecular weight dispersant include an anionic compound having a sulfonic acid group, a carboxylic acid group, etc.; a cationic compound having an aliphatic amine salt, a quaternary ammonium salt, etc.; a nonionic compound having a hydroxyl group, an oxyethylene chain, etc. Sex compounds; polymer compounds; and the like.
Specific examples thereof include sorbitan fatty acid esters, polyoxyethylene alkylamines, alkyldiamines, alkanolamine derivatives (US Pat. No. 3,536,510) and the like.

Among the dispersants, the polymer dispersant is preferable, and among the polymer dispersants, the basic block type dispersant and / or the basic graft type dispersant is functionally separated from the color material adsorption site and the solvent affinity site. In addition to the "total content of calcium (Ca) and iron (Fe)" and "total content of calcium (Ca) and iron (Fe)" described later, magnesium (Mg) and aluminum (Al) are further added. By setting the "total content of calcium (Cr) and calcium (Cr)" to a certain value or less, there is a synergistic effect with the effects of the present invention such as dispersion stability, colored image quality, and developability. It is preferable because it has a synergistic effect when used in combination.

Here, "the dispersant is a basic block type dispersant and / or a basic graft type dispersant" means that the dispersant is a basic block type dispersant, and that the dispersant is a basic graft type dispersant. Either that it is a basic block type dispersant and a basic graft type dispersant in combination, or that it is a dispersant that is both a basic block type dispersant and a basic graft type dispersant at the same time. Also means. Moreover, the combined use of a dispersant that is neither a basic block type dispersant nor a basic graft type dispersant is not excluded.

<< Basic block type dispersant >>
The "basic block-type dispersant" is a monomer having a basic group such as an amino group, a monoalkylamino group, a dialkylamino group, an amide group; a salt thereof; a trialkylammonium group; or the like (hereinafter, "a monomer"". (Abbreviated as) and a dispersant composed of a block copolymer of another monomer different from the monomer (hereinafter, abbreviated as “b monomer”), which may be a binary copolymer and may be of 3 or more elements. It may be a copolymer. The "a monomer" also includes those in which the above "alkyl" is paraphrased as "aryl", "aralkyl", "alkenyl" and the like.

Examples of the a monomer include a (meth) acrylate compound containing a quaternary ammonium base and / or a secondary or tertiary amino group in which hydrogen bonded to nitrogen may be substituted with a substituent or a salt thereof. Preferably, it is particularly preferably a tertiary amino group and / or a quaternary ammonium base.

［一般式（１）中、Ｒ^１は水素原子又はメチル基、Ａは２価の連結基、Ｒ^２及びＲ^３は、それぞれ独立して、水素原子又はヘテロ原子を含んでもよい炭化水素基を表し、Ｒ^２及びＲ^３が互いに結合して環構造を形成してもよい。］ As the a-monomer, a monomer having a structural unit represented by the following general formula (1) or a salt type of the structural unit represented by the following general formula (1) (described later) is more preferable. That is, in the present invention, the above-mentioned color material liquid for a color filter in which the dispersant is a basic block copolymer containing a structural unit represented by the following general formula (1) or a salt type thereof is preferable.

[In the general formula (1), R ¹ is a hydrogen atom or a methyl group, A is a divalent linking group, and R ² and R ³ are each independently a hydrocarbon group which may contain a hydrogen atom or a hetero atom. Represented, R ² and R ³ may be combined with each other to form a ring structure. ]

Specifically, the salt is formed by forming a tertiary amino group such as a unit forming a basic block copolymer with an acid such as a sulfonic acid compound or a phosphoric acid compound. Can be mentioned.
In addition, a tertiary amino group such as dimethylaminoethyl (meth) acrylate, which is a unit for forming a basic block copolymer, may be converted into a quaternary ammonium salt by an aryl halide, an aralkyl halide or the like.

When the a monomer gives a repeating unit represented by the general formula (1), a compound that reacts with an amino group after being appropriately copolymerized with another polymerizable monomer, for example, a sulfonic acid compound or phosphorus. An acid compound such as an acid compound or a carboxylic acid compound; a halogen compound such as aryl halide, alkyl halide, aralkyl halide; or the like may be reacted to obtain a part or all of the quaternary ammonium salt.

Examples of the sulfonic acid compound include compounds represented by the following general formula (2). That is, as the salt-formed compound, the block copolymer is a compound represented by the following general formula (2) in which at least a part of nitrogen of the structural unit represented by the above general formula (1) becomes a cation. The above-mentioned color material liquid for a color filter, which is a salt-type block copolymer in which one or more compounds selected from the group consisting of anions form salts, is preferable.

［一般式（２）において、Ｒ^ａは、炭素数１〜２０の直鎖、分岐鎖若しくは環状のアルキル基；置換基を有してもよいビニル基、フェニル基若しくはベンジル基又は−Ｏ−Ｒ^ｅを表し、Ｒ^ｅは、炭素数１〜２０の直鎖、分岐鎖若しくは環状のアルキル基；置換基を有してもよいビニル基、フェニル基若しくはベンジル基；又は炭素数１〜４のアルキレン基を介した（メタ）アクリロイル基を表す。］

[In the general formula (2), ^Ra is a linear, branched or cyclic alkyl group having 1 to 20 carbon atoms; a vinyl group, a phenyl group or a benzyl group which may have a substituent or —OR. represents ^e, R ^e is, having 1 to 20 carbon atoms straight chain, branched chain or cyclic alkyl group; substituent optionally a vinyl group which may have a phenyl group or a benzyl group; or an alkylene of 1 to 4 carbon atoms Represents a (meth) acryloyl group via a group. ]

Examples of the above-mentioned "halogen compounds such as aryl halides, alkyl halides, and aralkyl halides" include compounds represented by the following general formula (3). That is, as the salt-formed compound, the block copolymer is a compound represented by the following general formula (3) in which at least a part of the nitrogen of the structural unit represented by the above general formula (1) becomes a cation. The above-mentioned color material liquid for a color filter, which is a salt-type block copolymer in which one or more compounds selected from the group consisting of anions form salts, is preferable.

［一般式（３）において、Ｒ^ｂ、Ｒ^ｂ’及びＲ^ｂ”は、それぞれ独立に、水素原子；酸性基若しくはそのエステル基；置換基を有してもよい炭素数１〜２０の、直鎖、分岐鎖若しくは環状のアルキル基；置換基を有してもよいビニル基、フェニル基若しくはベンジル基；又は−Ｏ−Ｒ^ｆを表し、Ｒ^ｆは、置換基を有してもよい、炭素数１〜２０の直鎖、分岐鎖若しくは環状のアルキル基；置換基を有してもよい、ビニル基、フェニル基若しくはベンジル基；又は炭素数１〜４のアルキレン基を介した（メタ）アクリロイル基を表し、Ｘは、塩素原子、臭素原子又はヨウ素原子を表す。］
一般式（３）中のＸが、カウンターアニオン（Ｘ⁻）となり塩を形成する。

[In the general formula (3), R ^b , R ^b'and R ^{b "} are independently having a hydrogen atom; an acidic group or an ester group thereof; a direct group having 1 to 20 carbon atoms which may have a substituent. Chain, branched or cyclic alkyl group; may have a substituent, a vinyl group, a phenyl group or a benzyl group; or —OR ^f , where R ^f may have a substituent, a carbon. Linear, branched or cyclic alkyl groups of number 1 to 20; may have substituents, vinyl, phenyl or benzyl group; or (meth) acryloyl via an alkylene group of 1 to 4 carbons. Represents a group, where X represents a chlorine atom, a bromine atom or an iodine atom.]
X in the general formula (3) becomes a counter anion (X ⁻ ) and forms a salt.

Examples of the phosphoric acid compound include compounds represented by the following general formula (4). That is, as the salt-formed compound, the block copolymer is a compound represented by the following general formula (4) in which at least a part of the nitrogen of the structural unit represented by the above general formula (1) becomes a cation. The above-mentioned color material liquid for a color filter, which is a salt-type block copolymer in which one or more compounds selected from the group consisting of anions form salts, is preferable.

［一般式（４）において、Ｒ^ｃ及びＲ^ｄは、それぞれ独立に、水素原子；水酸基；炭素数１〜２０の、直鎖、分岐鎖若しくは環状のアルキル基；置換基を有してもよい、ビニル基、フェニル基若しくはベンジル基；又は−Ｏ−Ｒ^ｇを表し、Ｒ^ｇは、炭素数１〜２０の、直鎖、分岐鎖若しくは環状のアルキル基；置換基を有してもよい、ビニル基、フェニル基若しくはベンジル基；又は炭素数１〜４のアルキレン基を介した（メタ）アクリロイル基を表す。ただし、Ｒ^ｃ及びＲ^ｄの少なくとも１つは炭素原子を含む。］

[In the general formula (4), R ^c and R ^d may each independently have a hydrogen atom; a hydroxyl group; a linear, branched or cyclic alkyl group having 1 to 20 carbon atoms; a substituent. , Vinyl group, phenyl group or benzyl group; or —OR ^g ; R ^g may have a linear, branched or cyclic alkyl group having 1 to 20 carbon atoms; It represents a vinyl group, a phenyl group or a benzyl group; or a (meth) acryloyl group via an alkylene group having 1 to 4 carbon atoms. However, ^{at least one of R c} and R ^d contains a carbon atom. ]

Specific examples of the a monomer include a dialkylaminoalkyl ester of (meth) acrylic acid, a diarylaminoalkyl ester of (meth) acrylic acid, a dialalkylaminoalkyl ester of (meth) acrylic acid, and (meth) acrylic acid. Dialkenylaminoalkyl esters of the above, salts thereof and the like. Examples of the compound used for forming "these salts" include compounds represented by the above general formulas (2) to (4).

More specifically, for example, tertiary amino group-containing compounds such as dimethylaminoethyl (meth) acrylate, dimethylaminopropyl (meth) acrylate, diethylaminoethyl (meth) acrylate, diethylaminopropyl (meth) acrylate; these tertiary aminos. Salts of group-containing compounds; amides such as N-methylol (meth) acrylamide, N, N-dimethyl (meth) acrylamide, N, N-dimethylaminoethyl (meth) acrylamide, N, N-dimethylaminopropyl (meth) acrylamide, etc. Classes; quaternary ammonium group-containing compounds such as (meth) acryloylaminopropyltrimethylammonium chloride, (meth) acryloyloxyethyltrimethylammonium chloride, (meth) acryloyloxyethyltriethylammonium chloride, (meth) acryloyloxyethylbenzyldimethylammonium chloride. Salt; etc.

Particularly preferred are dimethylaminoethyl (meth) acrylate, dimethylaminoethyl (meth) acrylate sulfonate, dimethylaminoethyl (meth) acrylate phenylphosphonate, (meth) acryloyloxyethyl benzyl dimethylammonium chloride and the like. Be done.

When the basic block copolymer in which the a monomer is (co) polymerized or a salt-type dispersant thereof is used for a color filter, fine dispersion and dispersion stabilization become possible, and the concentration of the colorant is increased. However, good dispersion stability can be maintained. That is, it is possible to increase the concentration of the color material dispersion liquid and the coloring composition, and to improve the color rendering, thinning, contrast, good developability, good resolubility, etc. of the color filter obtained by using the same. Due to the synergistic effect of limiting the content of the specific metal element, the above-mentioned effect of the present invention is likely to be exhibited.

The coloring material is firmly adsorbed on the nitrogen moiety contained in the a monomer (preferably the structural unit represented by the general formula (1)) to have excellent dispersibility of the coloring material, and is also firmly adsorbed on the nitrogen moiety. The color material surrounded by the dispersant is easily washed away while being adsorbed on the dispersant during development, and the color material is not left behind on the base material, and the generation of residue is easily suppressed.
Similarly, the coloring material that is firmly adsorbed on the nitrogen portion and surrounded by the dispersant is easily washed away while being adsorbed on the dispersant by the resoluble solvent.

Examples of the b-monomer include acrylates such as benzyl (meth) acrylate, 2-hydroxy-3-phenoxypropyl (meth) acrylate and phenoxyethyl (meth) acrylate; and styrenes such as styrene as aromatic group-containing monomers. Vinyl ethers such as phenylvinyl ether; and the like.
Furthermore, methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) acrylate, butyl (meth) acrylate, octyl (meth) acrylate, (meth) acrylic. Examples thereof include (meth) acrylic acid ester-based monomers such as 2-ethylhexyl acid, glycidyl (meth) acrylate, and hydroxyethyl (meth) acrylate; vinyl acetate; acrylonitrile; and allyl group-containing compounds such as allyl alkyl ether.

As the b monomer, a carboxy group-containing monomer is also preferable. The carboxy group-containing monomer refers to a monomer containing a copolymerizable unsaturated double bond and a carboxy group.
Examples of the carboxy group-containing monomer include (meth) acrylic acid, vinyl benzoic acid, maleic acid, maleic acid monoalkyl ester, fumaric acid, itaconic acid, crotonic acid, cinnamic acid, and (meth) acrylic acid dimer. ..
Further, an addition reaction product of a monomer having a hydroxyl group such as 2-hydroxyethyl (meth) acrylate and a cyclic anhydride such as maleic anhydride, phthalic anhydride, or cyclohexanedicarboxylic acid anhydride; ω-carboxy- Polycaprolactone mono (meth) acrylate and the like can also be mentioned.
Further, as a precursor of the carboxy group, a carboxy group-containing monomer using an acid anhydride such as maleic anhydride, itaconic anhydride, or citraconic anhydride can also be mentioned.
Among them, (meth) acrylic acid is particularly preferable from the viewpoint of copolymerizability, cost, solubility and the like.

A comprehensive reason for selecting the b-monomer is that it has an affinity for a solvent, and can be finely dispersed and stabilized, especially when used for a color filter.

Assuming that the polymerization block containing a monomer or a salt thereof is "A" and the polymerization block containing b monomer is "B", the basic block type dispersant in the present invention is an AB block copolymer, A-. It may be any of a BA block copolymer, a BAB block copolymer, an ABAB block copolymer, and a block copolymer of more than that, but the AB block is preferable. It is a copolymer.

In a block copolymer containing a monomer or a salt thereof, the block portion containing the a monomer or its salt is adsorbed on the coloring material, and the block portion not containing the a monomer or its salt has an affinity for the solvent. , The dispersibility of the coloring material can be improved.

The weight average molecular weight (Mw) of the basic block copolymer in the present invention is not particularly limited, but is preferably in the range of 500 to 100,000, more preferably in the range of 1,000 to 30,000, and 3,000. It is particularly preferably in the range of ~ 20000, and most preferably in the range of 4000-15000.
Within the above range, it is possible to achieve both "wetting property for uniformly dispersing the coloring material" and dispersion stability. Further, when the colorant dispersant of the present application is used as a component of the coloring composition, if the upper limit is not more than the above value, the viscosity of the dispersion liquid does not become too high, and the developability and resolution do not deteriorate. On the other hand, when the lower limit is equal to or higher than the above value, sufficient dispersibility can be obtained.

Here, the weight average molecular weight (Mw) is determined as a standard polystyrene-equivalent value by gel permeation chromatography (GPC).
The weight average molecular weight (Mw) of the basic block copolymer was measured using HLC-8120GPC manufactured by Toso Co., Ltd., and N-methylpyrrolidone containing 0.01 mol / L lithium bromide as an elution solvent. The polystyrene standards for calibration curves are Mw377400, 210500, 96000, 50400, 20650, 10850, 5460, 2930, 1300, 580 (above, Easi PS-2 series manufactured by Polymer Laboratories) and Mw1090000 (manufactured by Toso Co., Ltd.). , The measurement column was TSK-GEL ALPHA-M x 2 (manufactured by Toso Co., Ltd.).

The amine value is not particularly limited, but is preferably 15 to 200 mgKOH / g, more preferably 30 to 150 mgKOH / g, and particularly preferably 40 to 130 mgKOH / g.
If the amine value is too small, sufficient dispersion stability cannot be obtained, and if it is too large, the solubility in a solvent decreases.
The amine value can be determined by JIS-K7237.

The acid value is preferably 0 to 50 mgKOH / g, more preferably 1 to 30 mgKOH / g, and particularly preferably 2 to 18 mgKOH / g. Within this range, the developability is excellent. Further, when the acid value is not more than the above upper limit, "resist pattern peeling" is unlikely to occur.

When the molecular weight, amine value or acid value is in the above range, it is easy to disperse, good dispersion stability can be maintained even if the colorant concentration is increased, developability is good, and the content of a specific metal element is limited. The above-mentioned effect of the present invention is likely to be exhibited by the synergistic effect with the above.
As a result, the color display obtained by using the color material dispersion liquid becomes a display having high contrast, high light transmittance, and high brightness.

<< Basic graft type dispersant >>
The "basic graft-type dispersant" refers to a basic dispersant composed of a (co) polymer in which a repeating unit is bonded to the main chain as a side chain.
Specifically, a side chain is synthesized first and then (co) polymerized, that is, a macromonomer having a polymerization unsaturated group at one end (repeatedly having a polymerizable unsaturated group at one end). Examples thereof include a dispersant composed of a (co) polymer containing an oligomer having a unit as a polymerization component.
In addition, a dispersant consisting of a (co) polymer in which a main chain is first synthesized and then a repeating unit (like a branch) is bonded to a pendant as a side chain in some places with respect to the main chain is used. Can be mentioned.

The basicity of the "basic graft-type dispersant" may be imparted in any way, but it is preferable that the basicity is imparted by copolymerizing a nitrogen atom-containing monomer having basicity.
The basic monomer to be copolymerized is not particularly limited, and specific examples thereof include the "a monomer" described in the section of the "basic block type dispersant".

The "macromonomer having a polymerizable group unsaturated group at one end" is not particularly limited, and known ones can be used.
The polymerization component constituting the repeating unit in the macromonomer is not particularly limited, but specifically, for example, a styrene-based monomer such as styrene or α-methylstyrene; methyl (meth) acrylate, (meth) acrylic. Ethyl acetate, n-propyl (meth) acrylate, isopropyl (meth) acrylate, butyl (meth) acrylate, octyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, glycidyl (meth) acrylate, benzyl (meth) (Meta) acrylic acid ester-based monomers such as meta) acrylate and hydroxyethyl (meth) acrylate; (meth) acrylamide, N-methylolacrylamide, N, N-dimethylacrylamide, N, N-dimethylaminoethylacrylamide and the like (meth) ) Acrylamide monomer; vinyl acetate; acrylonitrile; allyl group-containing compound such as allyl alkyl ether; and the like. The macromonomer in the present invention preferably has a unit in which the above-mentioned polymerization component is polymerized.

In the "basic graft-type dispersant", in addition to the above-mentioned "macromonomer having a polymerizable group unsaturated group at one end" and "basic monomer to be copolymerized", other polymerizable monomers are copolymerized. May be good.
The "other polymerizable monomer" is not particularly limited, and specific examples thereof include the "b monomer" described in the section of the "basic block type dispersant".

The introduction rate of the macromonomer is not particularly limited, but it is preferable that the macromonomer is introduced at an average ratio of 0.1 to 20 in 100 repeating units of the main chain, and 0.3 to 10 are introduced. It is particularly preferred that it be introduced in proportion.

The molecular weight of the basic graft-type dispersant in the present invention is not particularly limited, but the polystyrene-equivalent weight average molecular weight (Mw) is usually 1000 to 100,000, preferably 2000 to 40,000, more preferably 3000 to 30000, and particularly preferably. Is 4,000 to 25,000, more preferably 5,000 to 20,000.
Within the above range, it is easy to disperse, and it is possible to make fine dispersion in the "final dispersion step when preparing the color material dispersion liquid" and to shorten the dispersion time. As a result, the color display obtained by using the color material dispersion liquid becomes a display having high contrast, high light transmittance, and high brightness.

<< Commercial product >>
In the present invention, the commercially available product used as a dispersant is not limited, and specifically, for example, EFKA-4046, EFKA-4047, EFKA polymer 10, EFKA polymer 400, EFKA polymer 401, EFKA polymer 4300, EFKA Polymer 4310, EFKA Polymer 4320, EFKA Polymer 4330 (above, manufactured by BASF Japan Co., Ltd.), Disperbyk111, Disperbyk161, Disperbyk165, Disperbyk167, Disperbyk167, Disperbyk182, Disperbyk182, Disperbyk2000, SOLSPERSE24000, SOLSPERSE27000, SOLSPERSE28000 (all manufactured by Lubrizol), Azisper (registered trademark) PB821, PB822 (manufactured by Ajinomoto Fine Techno Co., Ltd.) and the like.

<Solvent>
The solvent of the coloring material liquid in the present invention is not particularly limited, and known ones are used.

Specifically, for example, alcohols such as methanol, ethanol and propanol; ethers such as tetrahydrofuran; propylene glycol monomethyl ether, propylene glycol dimethyl ether, propylene glycol methyl ethyl ether, propylene glycol monoethyl ether, propylene glycol diethyl ether and the like. Alkylene glycol ethers; diethylene glycol monomethyl ether, diethylene glycol dimethyl ether, diethylene glycol ethyl methyl ether, diethylene glycol monoethyl ether, diethylene glycol diethyl ether, dipropylene glycol monomethyl ether, dipropylene glycol dimethyl ether, dipropylene glycol methyl ethyl ether, dipropylene glycol monoethyl ether , Dialkylene glycol ethers such as dipropylene glycol diethyl ether; trialkylene glycol ethers such as tripropylene glycol monomethyl ether, tripropylene glycol dimethyl ether, tripropylene glycol methyl ethyl ether, tripropylene glycol monoethyl ether and tripropylene glycol diethyl ether. Classes; alkylene glycol monoalkyl ether acetates such as ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate; dipropylene glycol monomethyl ether acetate, dipropylene glycol monoethyl ether Dialkylene glycol monoalkyl ether acetates such as acetate; trialkylene glycol monoalkyl ether acetates such as tripropylene glycol monomethyl ether acetate and tripropylene glycol monoethyl ether acetate; aromatic hydrocarbons such as toluene and xylene; methyl ethyl ketone, Ketones such as methylpropyl ketone, methyl amyl ketone, cyclopentanone, cyclohexanone, 4-hydroxy-4-methyl-2-pentanone, methyl isobutyl ketone; ethyl 2-hydroxypropionate, 2-hydroxy-2-methylpropionic acid Methyl, ethyl 2-hydroxy-2-methylpropionate, butyl 3-methoxyacetate, 3-methyl- Butyl 3-methoxy-3-methyl-1-butyl acetate, ethyl ethoxyacetate, ethyl hydroxyacetate, methyl 2-hydroxy-2-methylbutanoate, methyl 3-methoxypropionate, 3-methoxypropionate Esters such as ethyl, methyl 3-ethoxypropionate, ethyl 3-ethoxypropionate, methyl 2-hydroxypropanate, ethyl acetate, butyl acetate, methyl lactate, ethyl lactate, isoamyl acetate; and the like can be mentioned.
These solvents may be used alone or in combination of two or more.

Among them, in particular, propylene glycol monoethyl ether acetate, propylene glycol monomethyl ether acetate, ethyl 3-ethoxypropionate, butyl 3-methoxyacetate, butyl 3-methyl-3-methoxyacetate (3-methoxy-3-methyl-1-). Butyl acetate), diethylene glycol ethyl methyl ether, propylene glycol monomethyl ether, and methyl 2-hydroxypropanoate are preferable.

Further, from the viewpoint of developability, resolubility and the like, it is also preferable to use a mixed solvent containing two or more kinds of solvents.

When a mixed solvent is used, the first solvent is a glycol ether acetate solvent for reasons such as high safety; moderate volatility; good dispersibility due to moderate solubility; etc. (The above-mentioned alkylene glycol monoalkyl ether acetates, dialkylene glycol monoalkyl ether acetates, trialkylene glycol monoalkyl ether acetates, etc.) are preferably used. Among them, ethylene glycol monomethyl ether acetate or propylene glycol monomethyl ether acetate having a boiling point (meaning the boiling point at atmospheric pressure; the same applies hereinafter) of less than 150 ° C. is more preferable, and propylene glycol monomethyl ether acetate (PGMEA) is particularly preferable. ..

As the second solvent (solvent other than the first solvent), a solvent having an alcoholic hydroxyl group (hereinafter, may be referred to as an "alcoholic solvent") or a solvent having a boiling point of 150 ° C. or higher is preferable.
The second solvent may be used alone or in combination of two or more.

When an alcohol solvent is used as the second solvent, the dispersibility becomes good and the resolubility becomes good. In addition, it has high polarity and is excellent in dissolving dyes.
Examples of alcohol solvents include propylene glycol monomethyl ether (boiling point 121 ° C.), 3-methoxy-3-methyl-1-butanol (boiling point 174 ° C.), diacetone alcohol (boiling point 166 ° C.), and ethyl lactate (boiling point 151 ° C.). ) Etc. can be mentioned.

When a mixed solvent is used, the content of the alcohol-based solvent is preferably 10% by mass or less, more preferably 5% by mass or less, and further preferably 2% by mass or less in the total solvent. Further, 0.1% by mass or more is preferable, 0.3% by mass or more is more preferable, and 1% by mass or more is further preferable.
When it is within the above range, the solubility of the dispersant becomes good, and the dissolution of the dispersant in the first solvent is not hindered, so that the dispersion stability becomes good.

When the first solvent is a solvent having a boiling point of less than 150 ° C., if a solvent having a boiling point of 150 ° C. or higher is used as the second solvent, uneven drying is less likely to occur and the resolubility is improved.
Examples of solvents having a boiling point of 150 ° C. or higher include diethylene glycol ethyl methyl ether (boiling point 179 ° C.), 3-methoxy-3-methyl-1-butyl acetate (boiling point 188 ° C.), ethyl 3-ethoxypropionate (boiling point 170 ° C.). , 3-Methoxybutyl acetate (butyl 3-methoxyacetate) (boiling point 172 ° C.) and the like.

When a mixed solvent is used, the content of the solvent having a boiling point of 150 ° C. or higher is preferably 30% by mass or less, more preferably 20% by mass or less, still more preferably 15% by mass or less in the total solvent. Further, 1% by mass or more is preferable, 3% by mass or more is more preferable, and 5% by mass or more is further preferable.
Within the above range, uneven drying is unlikely to occur, and the drying time does not become too long, resulting in good productivity.

Further, by using an alcohol solvent and a solvent having a boiling point of 150 ° C. or higher in combination as the second solvent, the resolubility becomes extremely good and uneven drying is less likely to occur.
In this case, the content ratio (mass basis) of the solvent having a boiling point of 150 ° C. or higher with respect to the alcohol-based solvent is preferably 0.1 or more and 25 or less, more preferably 0.3 or more and 20 or less, and particularly preferably 0.5 or more and 10 or less. ..

The boiling point of the above-mentioned "solvent having a boiling point of 150 ° C. or higher" is preferably 240 ° C. or lower, and particularly preferably 200 ° C. or lower, from the viewpoint that the drying time does not become too long.

<Other ingredients>
The coloring material liquid may contain other components such as an alkali-soluble resin described later as long as the effects of the present invention are not impaired.

<Content ratio>
In the color material liquid for a color filter in the present invention, the content ratios of the color material, the dispersant and the solvent are not particularly limited, but the following are preferable.
The dispersant is preferably 5 to 200 parts by mass, more preferably 10 to 150 parts by mass, particularly preferably 15 to 100 parts by mass, and most preferably 20 to 60 parts by mass with respect to 100 parts by mass of the coloring material.
Further, the color material is preferably 3 to 40 parts by mass, more preferably 5 to 35 parts by mass, and particularly preferably 7 to 30 parts by mass with respect to 100 parts by mass of the color material liquid.

With the above-mentioned "content ratio of color material and dispersant", the color material is easily dispersed, excellent dispersion stability can be obtained, a color material dispersion liquid having a high color material concentration can be obtained, and the dispersion time can be shortened. It will be possible.
As a result, the color filter obtained by using the color material dispersion liquid exhibits the above-mentioned effects, can achieve high color rendering, high contrast, thin film, has high light transmittance, and becomes a high-luminance display.

Further, the above-mentioned "content ratio of coloring material and solvent" is excellent in dispersibility, dispersion stability, solubility and the like, and is adjusted to a suitable viscosity. When a colored composition is obtained by containing an alkali-soluble resin (and preferably a polymerizable polyfunctional compound), the content ratio thereof can be easily adjusted to an optimum value, which is preferable.

<Dispersion method>
The above-mentioned coloring material is dispersed and contained in a solvent in the presence of a dispersant. The effect of the present invention is particularly exhibited when it is wet-dispersed and contained.

In the present invention, the dispersion time is not particularly limited, but 0.01 to 50 hours is preferable, 0.02 to 30 hours is more preferable, and 0.05 to 10 hours is preferable so that the dispersion particle size of the coloring material is preferable. Time is particularly preferred.

<Content of specific metal element in color material liquid>
The color material liquid for a color filter in the present invention is characterized in that the total mass of calcium (Ca) and iron (Fe) contained in the color material liquid is 180 mass ppm or less with respect to the entire color material liquid. To do.
The total mass of calcium (Ca) and iron (Fe) is preferably as small as possible without considering cost and the like, but specifically, it is preferably 140 mass ppm or less with respect to the entire coloring material liquid. It is more preferably 70 mass ppm or less, particularly preferably 30 mass ppm or less, still more preferably 15 mass ppm or less, and most preferably 5 mass ppm or less.

When the "total mass of calcium (Ca) and iron (Fe) contained in the color material liquid" is not more than the above upper limit, it can be dispersed well even if the concentration of the color material contained in the color material liquid is increased, and even with time. A color material liquid for a color filter can be obtained in which dispersion stability is well maintained and deterioration with time is not likely to occur despite a high color material concentration.

Further, when a coloring composition for a color filter is produced using a coloring material liquid in which "the total mass of calcium (Ca) and iron (Fe) contained in the coloring material liquid" is equal to or less than the above upper limit, the coloring composition is contained. The color density can be increased, and as a result, a color filter that achieves a high color density even with a low film thickness can be obtained.
By using such a color material liquid, it is possible to obtain a coloring composition or a color filter which can achieve a low film thickness of the color filter, reduce parallax color mixing, achieve high color rendering, and have excellent developability in patterning.

In the coloring composition of the present invention obtained by using the coloring material liquid having a limited amount of metal, the concentration of the coloring material can be increased, good dispersion performance, dispersion stability performance, and solubility can be obtained, and at the time of manufacturing a color filter. Good developability is achieved. That is, for example, in the unexposed portion, the composition in the coloring composition is easily dissolved together with the coloring material in an alkaline developer.

The lower limit of the "total mass of calcium (Ca) and iron (Fe) contained in the coloring material liquid" is not particularly limited, but is preferably 1 mass ppm or more, and particularly preferably 3 mass ppm or more. If it is at least the above lower limit, it is sufficient to improve the dispersibility / solubility and the developability, so that the cost required for excessive removal of the metal element is not required.

Further, in the color material liquid for a color filter in the present invention, the total mass of magnesium (Mg), aluminum (Al) and chromium (Cr) contained in the color material liquid is 200 mass ppm with respect to the entire color material liquid. The following is preferable.
The total mass of magnesium (Mg), aluminum (Al), and chromium (Cr) contained in the coloring material liquid is more preferably 140% by mass or less, particularly preferably 60% by mass or less, based on the entire coloring material liquid. More preferably, it is 20 mass ppm or less.

Further, the total mass of magnesium (Mg) and chromium (Cr) contained in the coloring material liquid is preferably 200 mass ppm or less, more preferably 140 mass ppm or less, and 60 mass ppm or less. Is particularly preferable, and more preferably 20 mass ppm or less.
When it is not more than the above upper limit, the above-mentioned effect of the present invention is particularly exhibited.

"The total mass of calcium (Ca) and iron (Fe) contained in the color material liquid" is not more than the above upper limit, and "magnesium (Mg), aluminum (Al) and chromium (Cr) contained in the color material liquid" When the "total mass of" is not more than the above upper limit, the color material can be dispersed even better even if the concentration of the color material contained in the color material liquid is increased, the dispersion stability is further maintained even with time, and the concentration of the color material is high. Despite this, a color material liquid for a color filter that is less likely to deteriorate over time can be obtained.

The "total mass of calcium (Ca) and iron (Fe) contained in the coloring material liquid" is preferably not more than the above upper limit, and the calcium (Ca) is preferably 160% by mass or less with respect to the entire coloring material liquid. , 100 mass ppm or less is more preferable, 60 mass ppm or less is particularly preferable, and 30 mass ppm or less is further preferable.
Further, the "total mass of calcium (Ca) and iron (Fe) contained in the coloring material liquid" is not more than the above upper limit, and the iron (Fe) is 30% by mass or less with respect to the entire coloring material liquid. Is preferable, 20 mass ppm or less is more preferable, 10 mass ppm or less is particularly preferable, and 5 mass ppm or less is further preferable.
When it is not more than the above upper limit, the above-mentioned effect of the present invention is particularly exhibited.

The "total mass of calcium (Ca) and iron (Fe) contained in the coloring material liquid" is not more than the above upper limit, and "calcium (Ca), iron (Fe) and magnesium (Mg) contained in the coloring material liquid". The total mass of aluminum (Al) and chromium (Cr) is preferably 290 mass ppm or less, more preferably 260 mass ppm or less, particularly preferably 190 mass ppm or less, and 100 mass by mass, based on the entire coloring material liquid. It is more preferably ppm or less, and most preferably 50 mass ppm or less.
When it is not more than the above upper limit, the above-mentioned effect of the present invention is particularly exhibited.

Further, the "total mass of calcium (Ca), iron (Fe), magnesium (Mg) and chromium (Cr) contained in the coloring material liquid" is preferably 290 mass ppm or less with respect to the entire coloring material liquid. 260 mass ppm or less is more preferable, 190 mass ppm or less is particularly preferable, 100 mass ppm or less is further preferable, and 50 mass ppm or less is most preferable.
When it is not more than the above upper limit, the above-mentioned effect of the present invention is particularly exhibited.

<Principle of action>
The principle of action that exerts the above-mentioned effects of the present invention, such as improvement of dispersion stability, does not limit the scope of the invention, but is considered as follows.
That is, when a large amount of calcium (Ca), iron (Fe), or the specific metal element is present in the vicinity of the coloring material, it is presumed that the adsorption of the dispersant on the coloring material is inhibited. Further, it is presumed that the dispersant or the acidic dye derivative cannot contribute to the improvement of the dispersibility by forming a salt with the specific metal element by the salt-type dispersant or the acidic dye derivative that contributes to the improvement of the dispersibility. ..

In addition, the effect on the decrease in dispersibility is that divalent or higher cations such as cations of specific metal elements are more important than monovalent cations such as ^{sodium ion (Na +} ) and potassium ion (K ^+). It is possible that the size is larger. The larger the valence of the metal cation, the higher the effect on the cohesiveness. Therefore, "The upper limit of the total mass of Ca and Fe, which are metal elements having a valence of 2 or more, and the same, both of them. It is also considered that the "dispersion stability" was improved as a result of suppressing the "upper limit of the total mass of Mg, Al and Cr, which are metal elements having a valence of divalent or higher".
Further, it is more preferable to suppress the content of Fe, which is a metal element that gives a trivalent cation, more preferably, Al, which is a metal element that also gives a trivalent cation while suppressing the content of Fe. It is also considered that suppressing the content of Cr and Cr had a great influence on the improvement of dispersion stability.

Therefore, when the content of the specific metal element is small as specified in the present invention, it is presumed that the above-mentioned obstacles are unlikely to occur, and therefore the dispersibility and the developability described later are improved.

<Method of reducing the content of specific metal elements in the coloring material liquid>
The coloring material liquid in the present invention contains at least a coloring material and a solvent, but the specific metal element is brought in from the coloring material, the solvent and the like which are the raw materials of the coloring material liquid. It can also be mixed from equipment used for stirring, mixing, dispersion and the like. Therefore, it is preferable to prevent the metal from being mixed in from the raw materials and the apparatus.
In particular, since the amount of the specific metal element brought in from the coloring material is large, it is more preferable to remove the specific metal element from the coloring material.
Furthermore, it is particularly preferable to reduce the amount of the specific metal element from the coloring material to be blended, and when an acidic dye derivative is used, from those colorants.

The method for removing the specific metal element in the coloring material is not particularly limited, and the specific metal element may be removed in the manufacturing process of the coloring material, or the specific metal element is removed from the manufactured coloring material by a specific removing method. May be good.

Among the coloring materials, the dye manufacturing process and the method of removing the specific metal element from the manufactured coloring material include a recrystallization method, a dialysis method, a salting out method, an ion exchange resin method, column chromatography, and paper chromatography. Can be mentioned. The recrystallization method is preferable from the viewpoint of cost.
Further, among the manufactured coloring materials, the method for removing the specific metal element from the pigment is preferably cleaning with a liquid such as alcohol or water, but in terms of cost, the cleaning method with water (hereinafter, simply abbreviated as "water washing"). In some cases) is mentioned as a particularly preferable one.

In addition to "washing with liquid" such as "washing with water", the members of the manufacturing equipment in the color material manufacturing process are made of metal such as iron, stainless steel, or other iron-containing metal; chrome-plated member; etc. It is preferable not to use one.
"Members of manufacturing equipment" include media such as balls in ball mills and beads in bead mills; inner walls of coloring material manufacturing containers, dispersion containers, surface treatment containers, drying containers, filtration containers, etc.; members of crushers; Members; etc.

The removing method is particularly preferably washing with water. The water washing may be carried out by suspending the coloring material in water and suspending it by a batch method, or by using running water and treating it by a continuous method.

The amount of the specific metal element contained in the coloring material used in the coloring material liquid in the present invention can be achieved by adjusting or optimizing the following.
That is, as a means for reducing the amount of the specific metal element contained in the coloring material, the content of the specific metal element contained in the flush water used is reduced (demineralized water in which the amount of the metal is sufficiently reduced is used). ), The washing is performed by a continuous method using running water, the number of washings is increased when the washing is a batch method, the amount of flushing water is increased relative to the amount of coloring material in both the continuous method and the batch method, and the temperature of the flushing water The pH of the washing water is adjusted, the stirring device for washing with water is optimized, the washing time is lengthened, and the like.

Of these, a batch method in which the number of washings with water is increased, a continuous method using running water, or a method in which the temperature of the washing water is raised is particularly preferable.
The temperature of the washing water is more preferably in the range of 20 ° C. to 80 ° C. from the viewpoint of efficiently removing a predetermined metal, particularly preferably in the range of 30 ° C. to 70 ° C., and further preferably in the range of 40 ° C. to 60 ° C. ..
Among them, a continuous method using running water or the like is preferable, and in that case, the amount of running water used is preferably 30 parts by mass to 40,000 parts by mass, and 40 parts by mass to 20,000 parts by mass with respect to 1 part by mass of the coloring material. More preferably, 50 parts by mass to 10000 parts by mass is particularly preferable, and 60 parts by mass to 5000 parts by mass is further preferable.

Deionized water used for washing is made from raw water treated with strongly acidic or weakly acidic cation exchange resins, strongly basic or weakly basic anion exchange resins, ion exchange membranes, chelate resins, activated carbon, antibacterial activated carbon, etc. It is preferably obtained by treating at least one selected, preferably two or more of the above-mentioned treatment agents in combination, or by distilling (under reduced pressure).

The washing with water is not particularly limited, but the coloring material produced by a known method is suspended in the deionized water, and a vacuum filter, a belt press, a centrifuge, a nutche funnel, etc. are used. Using, continuous method of continuously supplying deionized water for continuous cleaning, stirring of filter press, homogenizer (high pressure or low pressure homogenizer, ultrasonic homogenizer, etc.), sand mill, ball mill, roll mill, magnetic stirrer, etc. A batch method of washing while dispersing the coloring material with a machine is preferable.

Above all, in order to reduce the mixing of metals such as calcium (Ca), iron (Fe), magnesium (Mg), aluminum (Al), and chromium (Cr) from the materials and media used, high-pressure or low-pressure homogenizers, ultra-ultrasonic A homogenizer such as an ultrasonic homogenizer is more preferable, and an ultrasonic homogenizer is particularly preferable from the viewpoint of reducing the amount of the specific metal element mixed in and reducing the cost.

Further, when washing while dispersing the coloring material using the above-mentioned stirrer, it is also preferable to continuously supply water and treat with running water by a continuous method. That is, it is also preferable to use the above-mentioned stirrer in combination with the continuous method in order to reduce the specific metal element.

In the cleaning step, impurities such as metal salts, free metals, and other inorganic salts in the coloring material are extracted into the deionized water. After washing, the suspension is filtered to remove impurities extracted in deionized water as a filtrate.
Next, the wet cake of the coloring material obtained above was suspended in deionized water again, and if necessary, a washing treatment was performed several times in the same step as above, and impurities were removed as a filtrate each time. It is preferable to dry the finally obtained wet cake of the coloring material to obtain a coloring material for blending in the coloring material liquid. From the viewpoint of the balance between the cleaning effect and the cost, the above-mentioned "several times" is preferably 2 to 50 times, more preferably 3 to 40 times, particularly preferably 4 to 30 times, and further preferably 5 to 20 times. The (particularly) preferable mass of the total deionized water used for 1 part by mass of the coloring material is the same as in the case of the above-mentioned "continuous method using running water".

That is, in a preferred embodiment of washing with water, the coloring material is washed by a batch method or a continuous method while dispersing the coloring material in water using a stirrer of "high pressure or low pressure homogenizer, sand mill, ball mill, roll mill, magnetic stirrer, etc." After filtration, the mixture is suspended in fresh water, washed with water, and in the case of the batch method, the above steps are repeated a plurality of times, and the mixture is filtered and dried.

The electrical conductivity of the final filtrate of the washing step is preferably 20 μS / cm or less (particularly preferably 0.05 μS / cm to 5 μS / cm). If the above-mentioned electric conductivity exceeds the above-mentioned range, the coloring material may be insufficiently washed with water, and the coloring material liquid in which the amount of the above-mentioned specific metal element is reduced to the above-mentioned range of the present invention may not be produced. ..
That is, it can be obtained by using the coloring material by repeating the washing treatment to a level comparable to the electrical conductivity of the deionized water used for washing the coloring material and making the impurities in the coloring material almost zero. The coloring material liquid exerts the above-mentioned effect of the present invention.

Further, the final cleaning step of the coloring material used for preparing the coloring material liquid in the present invention can also be confirmed by ICP (Inductively Coupled Plasma) emission spectroscopic analysis of the filtrate. The ICP measurement of the filtrate is carried out in the same manner in the method described in Measurement Example <Quantification of Metal in Color Material Solution> in the Example, in which the "color material solution" in the measurement example is replaced with the "filtrate".

The content of both calcium (Ca) and iron (Fe) in the final filtrate of the washing step is preferably not more than the detection limit, and calcium (Ca), iron (Fe), magnesium (Mg), and so on. It is more preferable that both aluminum (Al) and chromium (Cr) are below the detection limit, and calcium (Ca), iron (Fe), magnesium (Mg), aluminum (Al), chromium (Cr), sodium ( It is particularly preferable that both Na) and potassium (K) are below the detection limit.
Here, the detection limit in the measurement method of the present invention (ICP (Inductively Coupled Plasma) emission spectroscopic analysis) is less than 0.01 ppm.

When the "content by ICP measurement" or "electrical conductivity of the filtrate" of each metal atom which is an impurity in the above-mentioned filtrate exceeds the above-mentioned upper limit value, the content of the above-mentioned predetermined metal in the coloring material liquid is high. Since it may not fall within the scope of the present invention described above, a color material solution having a high color material concentration may not be prepared with a low viscosity (optimal viscosity), or dispersion stability may not be achieved.
Therefore, when preparing the coloring material, it is preferable to repeat the washing treatment until the content of the specific metal element in the filtrate and the electrical conductivity of the filtrate are within the above numerical ranges.

<Aspect of color material dispersion liquid>
The average dispersed particle size of the coloring material in the coloring material dispersion liquid in the present invention is not particularly limited, but is preferably 8 nm to 150 nm, more preferably 10 nm to 100 nm, and particularly preferably 12 nm to 70 nm.
Here, the average dispersed particle size of the colored material in the colored material dispersion liquid (hereinafter, may be simply abbreviated as "average dispersed particle size") is the color material dispersed in a dispersion medium containing at least a solvent. The dispersed particle size of the particles, which is measured by a laser light scattering particle size distribution meter. For the measurement of the particle size by the laser light scattering particle size distribution meter, the color material dispersion is appropriately diluted with the solvent used in the color material dispersion to a concentration that can be measured by the laser light scattering particle size distribution meter (for example, 1000). Measured at 23 ° C. by a dynamic light scattering method using a laser light scattering particle size distribution meter (for example, a nanotrack particle size distribution measuring device UPA-EX150 manufactured by Nikkiso Co., Ltd.). The average dispersed particle size here is the volume average particle size.

If the average dispersed particle size is too small, the light resistance may decrease, while if the average dispersed particle size is too large, the display using the color filter obtained by using the colorant dispersion has a contrast. It may be low, the light transmittance may be low, or the display may not be high-brightness.

After dispersion, it is preferable to filter with a filter of usually 0.05 μm to 10 μm, preferably 0.1 μm to 5 μm or the like to obtain the color material dispersion liquid in the present invention.

<Coloring composition for color filters>
The coloring material liquid in the present invention can be suitably used for a color filter material, a coloring composition for a color filter, a coloring composition for a color filter, a liquid crystal display material, an organic EL display material, and the like. In particular, it is useful as a coloring composition for a color filter.
The present invention is a coloring composition containing the coloring material liquid for a color filter, a polymerization initiator and an alkali-soluble resin according to the present invention, and the calcium (Ca) and iron (Fe) contained in the coloring composition. A coloring composition for a color filter, characterized in that the total mass is 120% by mass or less with respect to the entire coloring composition.
The alkali-soluble resin has a polymerizable functional group, and only the polymerizable functional group of the alkali-soluble resin may be polymerized, but the coloring composition for a color filter further contains a polymerizable polyfunctional compound. It is also preferable.

The coloring composition for a color filter of the present invention exhibits the above-mentioned effects of the present invention.

<< Alkali-soluble resin >>
The alkali-soluble resin of the present invention is not particularly limited as long as it has a hydrocarbon ring, and can be used as long as it can be suitably developed with an alkaline developer.
The alkali-soluble resin is preferably a copolymer containing a monomer having an acid group as a copolymerization component. Further, the polymer may have an acid group introduced later.

Here, as the monomer having an acid group, a monomer having a carboxy group such as (meth) acrylic acid and itaconic acid (methylenesuccinic acid); a monomer having a phenolic hydroxyl group such as 4-hydroxyphenylmaleimide; Monomers having a carboxylic acid anhydride group such as itaconic anhydride; and the like.

Further, the alkali-soluble resin in the present invention is strong as a result of introducing a radically polymerizable double bond, which improves the sensitivity, the coloring composition is image-exposed and photocured, and the unexposed portion is developed. It is preferable from the viewpoint that a good coating film can be formed.
To introduce a radically polymerizable double bond, for example, after (co) polymerization of a monomer capable of introducing a radically polymerizable double bond after polymerization, a radically polymerizable double bond as described later is introduced into a side chain. To do.
Examples of such a "monomer capable of introducing a radically polymerizable double bond after polymerization" include a monomer having a carboxy group such as (meth) acrylic acid and itaconic acid; and a carboxylic acid anhydride such as maleic anhydride and itaconic anhydride. Monomers having a group; and the like.

Compounds used to introduce radically polymerizable double bonds include "epoxide groups" such as glycidyl (meth) acrylate, 3,4-epoxycyclohexylmethyl (meth) acrylate, o- or m- or p-vinylbenzyl glycidyl ether. And a compound having a "radical polymerizable double bond".
A radically polymerizable double bond is introduced by reacting the acid group of the "monomer capable of introducing a radically polymerizable double bond after polymerization" with the epoxy group of the compound having "an epoxy group and a radically polymerizable double bond". The obtained alkali-soluble resin is obtained.

In addition to the above, a monomer copolymerizable with these can be used for the alkali-soluble resin, and an ethylenically unsaturated double bond is used as the monomer (hereinafter, abbreviated as “other monomer”). Examples thereof include styrene-based monomers such as styrene and α-methylstyrene; methyl (meth) acrylate, ethyl (meth) acrylate (meth) n-propyl acrylate, (meth). (Meta) such as isopropyl acrylate, butyl (meth) acrylate, octyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, glycidyl (meth) acrylate, benzyl (meth) acrylate, hydroxyethyl (meth) acrylate, etc. Acrylate-based monomers; (meth) acrylamide-based monomers such as (meth) acrylamide, N-methylolacrylamide, N, N-dimethylacrylamide, N, N-dimethylaminoethylacrylamide, etc .; vinyl acetate; acrylonitrile; allylalkyl ether, etc. Allyl group-containing compounds; maleimide-based monomers such as benzyl maleimide and N-phenyl maleimide; and the like are copolymerized.

The above-mentioned "monomer having an acid group", "monomer capable of introducing a radically polymerizable double bond after polymerization", "compound used for introducing a radically polymerizable double bond" and "other monomer" are used. In some cases, one or more of them are used, respectively, and are subjected to (co) polymerization or reaction.

The acid value of the alkali-soluble resin in the present invention is not particularly limited, but is preferably 30 to 200 mgKOH / g, more preferably 40 to 150 mgKOH / g, and particularly preferably 50 to 120 mgKOH / g.
When the upper limit of the acid value is not more than the above value, sufficient adhesion to the substrate can be obtained, and when the lower limit is not more than the above value, sufficient alkali developability can be obtained.

The molecular weight of the alkali-soluble resin in the present invention is not particularly limited, but the polystyrene-equivalent weight average molecular weight (Mw) is usually 3000 to 25000, preferably 4000 to 20000, and particularly preferably 5000 to 15000.
When the upper limit of the weight average molecular weight (Mw) is not more than the above value, the compatibility with other constituents is improved, the developability is improved, and the viscosity is not too high. On the other hand, when the lower limit is equal to or higher than the above value, the adhesion to the substrate is improved.

The alkali-soluble resin in the present invention is indispensable to have a hydrocarbon ring from the viewpoint of excellent adhesion of the colored layer and the like. By having a hydrocarbon ring, which is a bulky group, in the alkali-soluble resin, shrinkage during curing is suppressed, peeling from the substrate is alleviated, and substrate adhesion is improved. Further, the present inventors have found that the solvent resistance of the obtained colored layer, particularly the swelling of the colored layer, is suppressed by using an alkali-soluble resin having a hydrocarbon ring. Although the action is unclear, the inclusion of a bulky hydrocarbon ring in the colored layer suppresses the movement of molecules in the colored layer, resulting in higher strength of the coating film and suppression of swelling due to the solvent. It is presumed to be.

Further, when the alkali-soluble resin has a hydrocarbon ring, the development residue can be suppressed and the occurrence of water stains can be suppressed.

Examples of such a hydrocarbon ring include a cyclic aliphatic hydrocarbon ring which may have a substituent, an aromatic ring which may have a substituent, and a combination thereof. May have a substituent such as a carbonyl group, a carboxyl group, an oxycarbonyl group, or an amide group.

Specific examples of hydrocarbon rings include aliphatic hydrocarbons such as cyclopropane, cyclobutane, cyclopentane, cyclohexane, norbornane, tricyclo [5.2.1.0 (2,6)] decane (dicyclopentane), and adamantan. Rings; aromatic rings such as benzene, naphthalene, anthracene, phenanthrene, and fluorene; chain polycycles such as biphenyl, terphenyl, diphenylmethane, triphenylmethane, and stilben, and cardo structures represented by the following general formula (5). Can be mentioned.

When the hydrocarbon ring contains an aliphatic ring, it is preferable because the heat resistance and adhesion of the colored layer are improved and the brightness of the obtained colored layer is improved.
Further, when the cardo structure represented by the general formula (5) is contained, the curability of the colored layer is improved and the solvent resistance (suppression of NMP swelling) is improved, which is particularly preferable.

The alkali-soluble resin preferably has a crosslinked cyclic aliphatic group, which is an aliphatic group having a structure in which two or more rings share two or more atoms.
Specific examples of the crosslinked cyclic aliphatic group include norbornyl group, isobornyl group, adamantyl group, tricyclodecyl group, dicyclopentenyl group, dicyclopentanyl group, tricyclopentenyl group, tricyclopentanyl group and tricyclo. Pentaziene group, dicyclopentadiene group; a group in which a part of these groups is substituted with a substituent can be mentioned.
Examples of the substituent include an alkyl group, a cycloalkyl group, an alkylcycloalkyl group, a hydroxyl group, a ketone group, a nitro group, an amine group, a halogen atom and the like.

The lower limit of the number of carbon atoms of the crosslinked cyclic aliphatic group is preferably 5 or more, and particularly preferably 7 or more, from the viewpoint of compatibility with other materials and solubility in an alkaline developer. The upper limit is preferably 12 or less, and particularly preferably 10 or less.

Further, the alkali-soluble resin preferably has a maleimide structure represented by the following general formula (6).

［一般式（６）において、Ｒ^Ｍは、置換されていてもよい環状構造を有する炭化水素基である。］

[In the general formula (6), ^RM is a hydrocarbon group having a cyclic structure which may be substituted. ]

When the alkali-soluble resin has a maleimide structure represented by the general formula (6), it has a nitrogen atom in the hydrocarbon ring, so that the compatibility with the above-mentioned basic block type dispersant and basic graft type dispersant is very high. Therefore, the development speed is extremely high, and the development residue tends to be extremely small.

In the general formula (6), as R ^M, aliphatic substituted or hydrocarbon groups include an aromatic hydrocarbon group which may be substituted.
Examples of the former include a cyclopentyl group, a cyclohexyl group, a cyclooctyl group and the like.
Examples of the latter include a phenyl group, a methylphenyl group, an ethylphenyl group, a dimethylphenyl group, a diethylphenyl group, a methoxyphenyl group, a benzyl group, a hydroxyphenyl group, a naphthyl group and the like.

Further, it is particularly preferable that the alkali-soluble resin has both the maleimide structure represented by the general formula (6) and the hydrocarbon ring from the viewpoint of reducing the development residue.

Further, the alkali-soluble resin preferably has a structural unit represented by the following general formula (7).

［一般式（７）において、Ｘは、水素原子又はメチル基である。また、Ｙは下記一般式（８）で表されるフェノキシエチル構造を有する基である。］

[In the general formula (7), X is a hydrogen atom or a methyl group. Further, Y is a group having a phenoxyethyl structure represented by the following general formula (8). ]

［一般式（８）において、ｎは、１〜８の整数である。］

[In the general formula (8), n is an integer of 1 to 8. ]

In the present invention, n in the general formula (8) is preferably 1 to 4, and particularly preferably 2-phenoxyethyl (meth) acrylate in which n is 1.
By using the above-mentioned compound, the development residue is better and the resolubility is improved.

In the case of an alkali-soluble resin containing an aliphatic ring, if the developing speed is appropriate, the compatible dispersant and the coloring material are developed together, so that the development residue tends to be small.

In the alkali-soluble resin used in the present invention, it is easier to adjust the amount of each structural unit by using an acrylic copolymer having a structural unit having a hydrocarbon ring in addition to the structural unit having a carboxyl group. It is preferable because it is easy to improve the function of the structural unit by increasing the amount of the structural unit having a hydrocarbon ring.
The acrylic copolymer having a structural unit having a carboxyl and the above-mentioned hydrocarbon ring shall be prepared by using an ethylenically unsaturated monomer having a hydrocarbon ring as the above-mentioned "other copolymerizable monomer". Can be done.
Examples of the ethylenically unsaturated monomer having a hydrocarbon ring include cyclohexyl (meth) acrylate, dicyclopentanyl (meth) acrylate, adamantyl (meth) acrylate, isobornyl (meth) acrylate, benzyl (meth) acrylate, and phenoxyethyl. Examples thereof include (meth) acrylate, styrene, N-phenylmaleimide, N-benzylmaleimide, and N-cyclohexylmaleimide. Phenoxyethyl (meth) acrylate, cyclohexyl (meth) acrylate, and dicyclo Pentanyl (meth) acrylate, adamantyl (meth) acrylate, benzyl (meth) acrylate, styrene, and N-phenylmaleimide are preferable, and phenoxyethyl (meth) acrylate and styrene are particularly preferable.

In the present invention, the alkali-soluble resin in the coloring composition has a hydrocarbon ring, but in the alkali-soluble resin, a structural unit having a hydrocarbon ring (hereinafter, may be referred to as a "hydrocarbon-containing ring structural unit"). When two or more kinds of hydrogen is contained, the effect of the present invention may be synergistically produced, which is preferable.
"In the alkali-soluble resin, two or more kinds of constituent units having a hydrocarbon ring are contained" means that the coloring composition contains an alkali-soluble resin having two or more kinds of hydrocarbon-containing ring constituent units (described later). Coloring Composition Preparation Examples 26 to 28) When an alkali-soluble resin having two or more kinds of hydrocarbon rings (at least two kinds of alkali-soluble resins have different constituent units from each other) is contained in the coloring composition (described later). It may be any of the coloring composition preparation example 30) of. A plurality of alkali-soluble resins having two or more hydrocarbon-containing ring constituent units may be used in combination.

<< Polymerizable polyfunctional compound >>
The polymerizable polyfunctional compound is not particularly limited, and a known polymerizable polyfunctional compound is used.
The "polymerizable polyfunctional compound" is not particularly limited as long as it has two or more polymerizable functional groups in one molecule, and is, for example, polyester (meth) acrylate, polyether (meth) acrylate, or urethane. Polyfunctional (meth) acrylates such as (meth) acrylate and epoxy (meth) acrylate; polyfunctional allyl compounds such as diallyl phthalate and triallyl isocyanurate; and the like can be mentioned.

Among these, specific examples of the polyether (meth) acrylate include the following.
Examples of the bifunctional (meth) acrylate include linear alkanediol di (meth) acrylates such as 1,4-butanediol di (meth) acrylate and 1,6-hexanediol di (meth) acrylate; diethylene glycol di (meth) acrylate. ) Acrylate, polyethylene glycol # 200 di (meth) acrylate, dipropylene glycol di (meth) acrylate, tripropylene glycol di (meth) acrylate, polypropylene glycol # 400 di (meth) acrylate; pentaerythritol di (meth) acrylate, etc. Partial (meth) acrylic acid ester of trivalent or higher alcohol; bisphenol di (meth) acrylate such as bisphenol A di (meth) acrylate, bisphenol F di (meth) acrylate; neopentyl glycol di (meth) acrylate; etc. Can be mentioned.

Examples of the trifunctional (meth) acrylate include glycerin tri (meth) acrylate, glycerin PO-modified tri (meth) acrylate, trimethylolpropane tri (meth) acrylate, trimethylolpropane EO-modified tri (meth) acrylate, and trimethylolpropane. PO-modified tri (meth) acrylate, isocyanuric acid EO-modified tri (meth) acrylate, isocyanuric acid EO-modified ε-caprolactone-modified tri (meth) acrylate, 1,3,5-triacryloyl hexahydro-s-triazine, pentaerythritol tri Examples thereof include (meth) acrylate and dipentaerythritol tri (meth) acrylate tripropionate.

Examples of the tetrafunctional or higher functional (meth) acrylate include pentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, succinic acid-modified dipentaerythritol penta (meth) acrylate, and pentaerythritol tri (meth) acrylate. Examples thereof include succinic acid modified products, dipentaerythritol penta (meth) acrylate monopropionate, dipentaerythritol hexa (meth) acrylate, tetramethylol ethanetetra (meth) acrylate, and oligoester tetra (meth) acrylate.

One of these polyfunctional monomers may be used alone, or two or more thereof may be used in combination. For example, a polyfunctional monomer having a carboxy group and a polyfunctional monomer having no carboxy group may be used in combination. Succinic acid-modified product of pentaerythritol tri (meth) acrylate having a carboxy group and succinic acid-modified product of dipentaerythritol penta (meth) acrylate having a carboxy group from the viewpoint of improving heat resistance and adhesion. Things and the like are preferable.

<< Polymerization Initiator >>
Examples of the polymerization initiator include a thermal polymerization initiator and a photopolymerization initiator.
The photopolymerization initiator is not particularly limited, and known ones conventionally used for radical polymerization can be used. In particular, it is preferable to use one that is generally used for manufacturing a color filter.

Specifically, such a photopolymerization initiator is a compound that generates a free radical by the energy of ultraviolet rays, and is a benzoin derivative; a benzophenone derivative; a xanthone derivative such as xanthone, diethylthioxanthone, or isopropylthioxanthone, or a thioxanthone derivative; Irgacure OXE-01, Irgacure OXE-02 (above, manufactured by BASF Japan); oxime ester compounds such as ADEKA OPT-N-1919 (manufactured by Asahi Denka); chlorosulfonyl, chloromethyl polynuclear aromatic compound, chloromethyl heterocycle Examples thereof include halogen-containing compounds such as formula compounds and chloromethylbenzophenones; triazines; fluorenones; haloalkanes; redox couples of photoreducing dyes and reducing agents; organic sulfur compounds; peroxides; and the like.

Specific examples of the photopolymerization initiator include aromatic ketone compounds such as Michler ketone, 4,4'-bisdiethylaminobenzophenone, 4-methoxy-4'-dimethylaminobenzophenone, 2-ethylanthraquinone, and phenanthrene; benzoin. Benzoin ether compounds such as methyl ether, benzoin ethyl ether and benzoin phenyl ether; benzoin compounds such as methyl benzoin and ethyl benzoin; 2- (o-chlorophenyl) -4,5-phenylimidazole dimer, 2- (o-chlorophenyl) ) -4,5-di (m-methoxyphenyl) imidazole dimer, 2- (o-fluorophenyl) -4,5-diphenylimidazole dimer, 2- (o-methoxyphenyl) -4,5- Biimidazole compounds such as diphenylimidazole dimer, 2,4,5-triarylimidazole dimer, 2- (o-chlorophenyl) -4,5-di (m-methylphenyl) imidazole dimer; 2- Benzyl-2-dimethylamino-1- (4-morpholinophenyl) -butanone, 2-trichloromethyl-5-styryl-1,3,4-oxadiazole, 2-trichloromethyl-5- (p-cyanostyryl) ) -1,3,4-oxadiazole, 2-trichloromethyl-5- (p-methoxystyryl) -1,3,4-oxadiazole and other halomethylthiazole compounds; 2,4-bis (trichloromethyl) ) -6-p-methoxystyryl-s-triazine, 2,4-bis (trichloromethyl) -6- (1-p-dimethylaminophenyl-1,3-butadienyl) -s-triazine, 2-trichloromethyl- 4-Amino-6-p-methoxystyryl-s-triazine, 2- (naphth-1-yl) -4,6-bis-trichloromethyl-s-triazine, 2- (4-ethoxy-naphth-1-yl) ) -4,6-bis-Trichloromethyl-s-triazine, 2- (4-butoxy-naphtho-1-yl) -4,6-bis-trichloromethyl-s-triazine and other halomethyl-s-triazine compounds 2,2-Dimethoxy-1,2-diphenylethane-1-one, 2-methyl-1- [4- (methylthio) phenyl] -2-morpholinopropanone, 1,2-benzyl-2-dimethylamino- 1- (4-morpholinophenyl) -butanone-1,1-hydroxy-cyclohexyl-phenylketone, methyl benzoyl benzoate, 4-benzo Il-4'-methyldiphenylsulfide, benzylmethylketal, dimethylaminobenzoate, isoamyl p-dimethylaminobenzoate, 2-n-butoxyethyl-4-dimethylaminobenzoate, 2-chlorothioxanthone, 2,4-diethylthioxanthone, 2,4-Dimethylthioxanthone, isopropylthioxanthone, etanone, 1- [9-ethyl-6- (2-methylbenzoyl) -9H-carbazole-3-yl] -1- (o-acetyloxime), 4-benzoyl- Methyldiphenyl sulfide, 1-hydroxy-cyclohexyl-phenylketone, 2-benzyl-2- (dimethylamino) -1- [4- (4-morpholinyl) phenyl] -1-butanone, 2- (dimethylamino)- 2-[(4-Methylphenyl) methyl] -1- [4- (4-morpholinyl) phenyl] -1-butanone, α-dimethoxy-α-phenylacetophenone, phenylbis (2,4,6-trimethylbenzoyl) Examples thereof include phosphine oxide, 2-methyl-1- [4- (methylthio) phenyl] -2- (4-morpholinyl) -1-propanol, 1,2-octadione and the like.

Further, a photopolymerization initiator having a tertiary amine structure can be preferably used. Since the photopolymerization initiator having a tertiary amine structure has a tertiary amine structure which is an oxygen quencher in the molecule, radicals generated from the photopolymerization initiator are less likely to be deactivated by oxygen, and the sensitivity can be improved. It has the advantage of being able to.
Examples of commercially available photopolymerization initiators having a tertiary amine structure include Irgacure 907, Irgacure 369 (above, manufactured by BASF Japan Ltd.), and HiCure ABP (manufactured by Kawaguchi Pharmaceutical Co., Ltd.).

<<< Oxime Ester-based Photopolymerization Initiator >>>
The coloring composition for a color filter of the present invention preferably contains an oxime ester-based photopolymerization initiator.
When an oxime ester-based photopolymerization initiator is used when preparing a coloring composition for a color filter, the sensitivity (residual film ratio) of the coloring composition is improved.

Oxime ester-based photopolymerization initiators are JP-A-2000-80068, JP-A-2001-233842, JP-A-2010-527339, JP-A-2010-527338, JP-A-2013-041153, International Publication No. 2015/036910. Etc. can be appropriately selected from the compounds described in the above.

Commercially available oxime ester-based photopolymerization initiators include Irgacure OXE-01, Irgacure OXE-02, Irgacure OXE-03, Irgacure OXE-04 (above, manufactured by BASF), ADEKA OPT-N-1919, and ADEKA ARCULS. Examples include NCI-930, ADEKA ARKULS NCI-831 (above, manufactured by ADEKA), TR-PBG-304, TR-PBG-326, TR-PBG-3057 (above, manufactured by Joshu Powerful Electronics New Materials Co., Ltd.). ..
Of these, Irgacure OXE-03, Irgacure OXE-04, ADEKA OPT-N-1919, ADEKA ARCLUDS NCI-930, ADEKA ARKULUS NCI-831, and TR-PBG-304 are particularly preferable because of their high sensitivity.

Specific compound names of the oxime ester-based photopolymerization initiator include the following compounds, that is, compounds of the following formulas (A1) and (B1) to (B7).

The oxime ester-based photopolymerization initiator may be used alone or in combination of two or more.

<<< Other Photopolymerization Initiators >>>
In addition to the oxime ester-based photopolymerization initiator, the coloring composition for a color filter of the present invention further comprises an α-aminoketone-based photopolymerization initiator, a biimidazole-based photopolymerization initiator, a thioxanthone-based photopolymerization initiator, and acylphos. It may contain a fin oxide-based photopolymerization initiator or the like.

The α-aminoketone-based photopolymerization initiator has the property of curing the middle part from the surface of the coating film and easily suppresses the deep-curability of the coating film. It is preferable because it has a high tendency to improve the property.
Examples of the α-aminoketone-based photopolymerization initiator include 2-methyl-1- (4-methylthiophenyl) -2-morpholinopropane-1-one (for example, Irgacure 907, manufactured by BASF) and 2-benzyl-2. -(Dimethylamino) -1- (4-morpholinophenyl) -1-butanone (eg, Irgacure 369, manufactured by BASF), 2- (dimethylamino) -2-[(4-methylphenyl) methyl] -1- [4- (4-morpholinyl) phenyl] -1-butanone (Irgacure 379EG, manufactured by BASF) and the like can be mentioned.
The α-aminoketone-based photopolymerization initiator may be used alone or in combination of two or more, among which 2-methyl-1- (4-methylthiophenyl) -2-morpholinopropane-1-one and , 2-Benzyl-2- (dimethylamino) -1- (4-morpholinophenyl) -1-butanone is preferably used in combination because the residual film ratio is improved.

The biimidazole-based photopolymerization initiator has a property of curing the deep part of the coating film, and easily suppresses the coating film surface curability. When combined with the compound represented by the oxime ester-based photopolymerization initiator, the coating film surface It is preferable because it has a high tendency to improve curability.
Examples of the biimidazole-based photopolymerization initiator include 2,2'-bis (2-chlorophenyl) -4,4', 5,5'-tetrakis (4-ethoxycarbonylphenyl) -1,2'-biimidazole. , 2,2'-bis (2-bromophenyl) -4,4', 5,5'-tetrakis (4-ethoxycarbonylphenyl) -1,2'-biimidazole, 2,2'-bis (2- Chlorophenyl) -4,4', 5,5'-tetraphenyl-1,2'-biimidazole, 2,2'-bis (2,4-dichlorophenyl) -4,4', 5,5'-tetraphenyl -1,2'-biimidazole, 2,2'-bis (2,4,6-trichlorophenyl) -4,4', 5,5'-tetraphenyl-1,2'-biimidazole, 2,2 '-Bis (2-bromophenyl) -4,4', 5,5'-Tetraphenyl-1,2'-biimidazole, 2,2'-bis (2,4-dibromophenyl) -4,4' , 5,5'-Tetraphenyl-1,2'-biimidazole, 2,2'-bis (2,4,6-tribromophenyl) -4,4', 5,5'-tetraphenyl-1, 2'-biimidazole and the like can be mentioned.
The biimidazole-based photopolymerization initiator may be used alone or in combination of two or more, and among them, it is preferable to use it in combination with a mercapto compound described later from the viewpoint of improving the coating film curability.
Further, it is preferable to use the oxime ester-based photopolymerization initiator in combination with the biimidazole-based photopolymerization initiator and the α-aminoketone-based photopolymerization initiator from the viewpoint of improving the residual film ratio and linearity.
"Improved linearity" means that the colored layer is formed in a straight line with less unevenness at the end of the colored layer formed in the developing step after the coloring composition is applied.

Examples of the thioxanthone-based photopolymerization initiator include 2,4-isopropylthioxanthone, 2,4-diethylthioxanthone, 1-chloro-4-propoxythioxanthone, 2,4-dichlorothioxanthone and the like.
The thioxanthone-based photopolymerization initiator may be used alone or in combination of two or more, and among them, the use of 2,4-isopropylthioxanthone and 2,4-diethylthioxanthone improves the transfer of radical generation. Is preferable.
Further, it is preferable to use the oxime ester-based photopolymerization initiator in combination with the thioxanthone-based photopolymerization initiator and the α-aminoketone-based photopolymerization initiator from the viewpoint of improving the residual film ratio.

Although the acylphosphine oxide-based photopolymerization initiator has a property of less yellowing due to heat, the sensitivity is generally low and sufficient curability may not be obtained. However, the oxime ester-based photopolymerization initiator is described above. When combined with, it is preferable because it tends to improve the overall coating film curability.
Examples of the acylphosphine oxide-based photopolymerization initiator include benzoyl-diphenylphosphine oxide, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, 2,3,5,6-tetramethylbenzoyl-diphenylphosphine oxide, 3 , 4-Dimethylbenzoyl-diphenylphosphine oxide, 2,4,6-trimethylbenzoyl-phenylethoxyphosphine oxide, bis (2,4,6-trimethylbenzoyl) -phenylphosphine oxide, bis (2,6-dimethoxybenzoyl)- Examples thereof include 2,4,4-trimethyl-pentylphosphine oxide and bis (2,6-dimethylbenzoyl) -ethylphosphine oxide.
The acylphosphine oxide-based photopolymerization initiator may be used alone or in combination of two or more, and among them, bis (2,4,6-trimethylbenzoyl) -phenylphosphine oxide is used to cure the coating film. It is preferable from the viewpoint of improving the property.

<<< Mercapto Compound >>>
The coloring composition of the present invention preferably contains a mercapto compound. Since the mercapto compound has the property of receiving radicals from radicals with a slow reaction and accelerating the reaction, it is possible to promote the surface hardening of the coating film and suppress the occurrence of water stains.
In addition, water stain refers to this phenomenon in which traces of water stains are generated after alkaline development and rinsing with pure water. Such water stains disappear after post-baking, so there is no problem as a product, but there is a problem that it is detected as unevenness abnormality in the appearance inspection of the patterning surface after development, and it is not possible to distinguish between normal products and abnormal products. Occurs. Therefore, if the inspection sensitivity of the inspection device is lowered in the visual inspection, the yield of the final color filter product is lowered as a result, which causes a problem.

Examples of the mercapto compound include 2-mercaptobenzothiazole, 2-mercaptobenzoxazole, 2-mercaptobenzoimidazole, 2-mercapto-5-methoxybenzothiazole, 2-mercapto-5-methoxybenzoimidazole, and 3-mercaptopropionic acid. , Methyl 3-mercaptopropionate, ethyl 3-mercaptopropionate, octyl 3-mercaptopropionate, 1,4-bis (3-mercaptobutylyloxy) butane, 1,3,5-tris (3-mercaptobutyloxy) Ethyl) -1,3,5-triazine-2,4,6 (1H, 3H, 5H) -trione, trimethylpropanthris (3-mercaptopropionate), pentaerythritoltetrakis (3-mercaptobutyrate), Examples thereof include pentaerythritol tetrakis (3-mercaptopropionate), dipentaerythritol hexakis (3-mercaptopropionate), tetraethylene glycolbis (3-mercaptopropionate) and the like.

In particular, a polyfunctional mercapto compound having two or more mercapto groups (-SH groups) in one molecule has a high crosslink density and is extremely excellent in suppressing water stains.
Specific examples of the polyfunctional mercapto compound include 1,4-bis (3-mercaptobutylyloxy) butane and 1,3,5-tris (3-mercaptobutyloxyethyl) -1,3,5-triazine-2. , 4,6 (1H, 3H, 5H) -trione, trimethylolpropanthris (3-mercaptopropionate), pentaerythritol tetrakis (3-mercaptobutyrate), pentaerythritol tetrakis (3-mercaptopropionate), Examples thereof include dipentaerythritol hexakis (3-mercaptopropionate) and tetraethylene glycol bis (3-mercaptopropionate).

Further, a secondary mercapto compound having a secondary mercapto group in which the carbon atom to which the mercapto group is bonded is a secondary carbon atom is preferable because a good water stain suppressing effect can be easily maintained even after long-term storage. Further, it is more preferable that the polyfunctional secondary mercapto compound has two or more secondary mercapto groups in one molecule.

By adding an alkali-soluble resin having a hydrocarbon ring to the coloring composition for a color filter and further using a mercapto compound in combination, the effect of suppressing the occurrence of water stains becomes extremely excellent synergistically.

The mercapto compound may be used alone or in combination of two or more.
When two or more kinds are used in combination, it is preferable that the polyfunctional mercapto compound and / or the secondary mercapto compound is contained therein, and it is particularly preferable that the polyfunctional secondary mercapto compound is contained.

In the coloring composition for a color filter of the present invention, the total content of the mercapto compound is not particularly limited as long as the effect of the present invention is not impaired, but is preferably with respect to the total solid content of the coloring composition for a color filter. It is in the range of 0.2% by mass or more and 7% by mass or less, more preferably 0.5% by mass or more and 5% by mass or less.
Within the above range, the occurrence of water stains can be effectively suppressed.

The total content of the photopolymerization initiator used in the coloring composition for a color filter of the present invention is not particularly limited as long as the effect of the present invention is not impaired, but is based on the total solid content of the coloring composition for a color filter. It is preferably in the range of 0.1% by mass or more and 16.0% by mass or less, and more preferably 1.0% by mass or more and 12.0% by mass or less. If this content is less than the above lower limit, photocuring does not proceed sufficiently, and the exposed portion may be eluted during development, which may impair the effect of the present invention. On the other hand, if it is more than the above upper limit, the obtained coloring is obtained. The yellowing of the layer may become stronger and the brightness may decrease.
In the present invention, the solid content is anything other than the above-mentioned solvent, and also includes a liquid polyfunctional monomer and the like.

The content of the oxime ester-based photopolymerization initiator used in the coloring composition for a color filter of the present invention is preferably 0.1% by mass or more and 8.0% by mass or less with respect to the total solid content of the coloring composition. More preferably, it is in the range of 0.5% by mass or more and 6.0% by mass or less. If this content is less than the above lower limit value, the effect of the present invention may be impaired, while if it is more than the above upper limit value, the yellowing of the obtained colored layer may become strong and the brightness may decrease.

When the oxime ester-based photopolymerization initiator and other photopolymerization initiator are used in combination as the photopolymerization initiator used in the present invention, the content of the oxime ester-based photopolymerization initiator is the coloring composition of the present invention. Of the total 100 parts by mass of the photopolymerization initiator used in the product, it is preferably 5 parts by mass or more, more preferably 10 parts by mass or more, further preferably 20 parts by mass or more, and 30 parts by mass. It is even more preferable that the amount is more than one part.
On the other hand, the content of the oxime ester-based photopolymerization initiator is 100 parts by mass in total of the photopolymerization initiator used in the coloring composition of the present invention from the viewpoint of sufficiently exerting the effect of being used in combination with other photopolymerization initiators. It is preferably 90 parts by mass or less, and more preferably 80 parts by mass or less.

As the photopolymerization initiator used in the present invention, at least one selected from an α-aminoketone-based photoinitiator, a biimidazole-based photoinitiator, a thioxanthone-based photoinitiator, and an acylphosphine oxide-based photoinitiator. When seeds are contained, the total content thereof is preferably 0.4% by mass or more and 4.0% by mass or less, more preferably 0.6% by mass or more, based on the total solid content of the coloring composition. It is in the range of 0% by mass or less.

When the α-aminoketone-based photopolymerization initiator and the biimidazole-based photopolymerizer and / or the thioxanthone-based photopolymerization initiator are combined as the photopolymerization initiator used in the present invention, the α-aminoketone-based photopolymerization initiator is used. The ratio of the biimidazole-based photopolymerization initiator and / or the thioxanthone-based photopolymerization initiator is 100 parts by mass of the α-aminoketone-based photopolymerization initiator and / or the thioxanthone-based photopolymerization initiator. The polymerization initiator is preferably 5 parts by mass or more and 60 parts by mass or less, and more preferably 10 parts by mass or more and 40 parts by mass or less from the viewpoint of achieving both coating film curability and pattern shape.

The photopolymerization initiator used in the present invention is not limited to one type, and two or more types may be used in combination.

<< Content ratio >>
The content ratio of the alkali-soluble resin and the polymerizable polyfunctional compound in the coloring composition of the present invention is not particularly limited, but is polymerized with respect to 100 parts by mass of the alkali-soluble resin from the viewpoint of sensitivity, resolution and developability. The sex polyfunctional compound is preferably 0 to 500 parts by mass, more preferably 10 to 300 parts by mass, and particularly preferably 20 to 200 parts by mass.
The alkali-soluble resin is preferably 5 to 80% by mass, more preferably 10 to 40% by mass, based on the total solid content of the coloring composition. Further, the polymerizable polyfunctional compound is preferably 5 to 60% by mass, more preferably 10 to 40% by mass, based on the total amount of the solid content.

From the viewpoint of sensitivity, resolution and developability, the content ratio of the polymerization initiator is usually 3 to 50 parts by mass, preferably 7 to 40 parts by mass, particularly preferably 10 to 10 parts by mass with respect to 100 parts by mass of the polymerizable polyfunctional compound. It is 35 parts by mass.

The coloring material is preferably 3 to 65% by mass, more preferably 6 to 55% by mass, and particularly preferably 10 to 45% by mass with respect to the total solid content of the coloring composition.
Within this range, the above-mentioned effects of the present invention are likely to be exhibited, and in particular, the coloring power, sensitivity, resolution and developability are good. In particular, when the color material liquid of the present invention is used, the concentration of the color material can be increased up to the above upper limit, and therefore, the excellent color filter as described above can be manufactured.

The content of the solvent is preferably in the range of 55 to 95% by mass, particularly preferably in the range of 65 to 88% by mass, based on the total amount of the coloring composition containing the solvent. ..
When the content of the solvent is within the above range, the coating property can be made excellent.

<< Other ingredients >>
Further, if necessary, the coloring composition may include, for example, a surfactant for improving wettability, a leveling agent, a silane coupling agent for improving adhesion, an adhesion accelerator, an antifoaming agent, and an anti-ultraviolet agent. It can contain an antioxidant, an antioxidant, an ultraviolet absorber, a polymerization inhibitor, a chain transfer agent and the like.

<< Content of specific metal element in coloring composition >>
The coloring composition for a color filter of the present invention is the coloring composition containing the coloring material liquid, the polymerization initiator and the alkali-soluble resin according to the present invention, and is contained in the coloring composition of calcium (Ca) and iron. The total mass of (Fe) is 120 mass ppm or less with respect to the entire coloring composition.

The total mass of calcium (Ca) and iron (Fe) contained in the coloring composition is preferably as small as possible without considering the cost, but is preferably 90 mass ppm or less with respect to the entire coloring composition. 50 mass ppm or less is more preferable, 20 mass ppm or less is particularly preferable, 10 mass ppm or less is further preferable, and 3 mass ppm or less is most preferable.
When it is not more than the above upper limit, the developability is good while maintaining the dispersion stability, so that the concentration of the colorant in the coloring composition and the concentration of the colorant in the solid content of the coloring composition can be increased. As a result, it is possible to obtain a color filter that realizes a high color density even with a low film thickness.

The coloring composition within the above-mentioned metal content range can obtain good dispersion performance, dispersion stability performance, and solubility, and also exhibits good developability during the production of a color filter.

The lower limit of the "total mass of calcium (Ca) and iron (Fe) contained in the coloring composition" is not particularly limited, but is preferably 0.5 mass ppm or more, and particularly preferably 1 mass ppm or more. When it is at least the above lower limit, the developability is sufficiently good, so that the cost required for removing the metal element is not excessively applied.

Further, the total mass of magnesium (Mg), aluminum (Al) and chromium (Cr) contained in the coloring composition is preferably 135 mass ppm or less with respect to the entire coloring composition. That is, the total mass of calcium (Ca) and iron (Fe) contained in the coloring composition is 120 mass ppm or less with respect to the entire coloring composition, and magnesium (Mg) and aluminum (Al) are added. The total mass of chromium (Cr) is preferably 135 mass ppm or less with respect to the entire coloring composition.
By preparing a coloring composition for a color filter using the coloring material liquid of the present invention, it is easy to prepare an excellent coloring composition within the above-mentioned metal content range.

The total mass of magnesium (Mg), aluminum (Al), and chromium (Cr) contained in the coloring composition is more preferably 60 mass ppm or less, particularly preferably 30 mass ppm or less, and further preferably 30 mass ppm or less. , 20 mass ppm or less.
When it is not more than the above upper limit, the above-mentioned effect of the present invention is particularly exhibited.

Further, the total mass of magnesium (Mg) and chromium (Cr) contained in the coloring composition is preferably 135 mass ppm or less, more preferably 60 mass ppm or less, and more preferably 30 mass ppm or less. Is particularly preferable, and more preferably 20 mass ppm or less.
When it is not more than the above upper limit, the above-mentioned effect of the present invention is particularly exhibited.

Further, the "total mass of calcium (Ca) and iron (Fe) contained in the coloring composition" is not more than the above upper limit, and "calcium (Ca), iron (Fe) and magnesium (containing in the coloring composition"). The total mass of Mg), aluminum (Al) and chromium (Cr) is preferably 200 mass ppm or less, more preferably 150 mass ppm or less, particularly preferably 100 mass ppm or less, based on the entire coloring composition. 50 mass ppm or less is more preferable, and 15 mass ppm or less is most preferable.
When it is not more than the above upper limit, the above-mentioned effect of the present invention is particularly exhibited.

Further, the "total mass of calcium (Ca) and iron (Fe) contained in the coloring composition" is not more than the above upper limit, and "calcium (Ca), iron (Fe) and magnesium (contained in the coloring composition"). The total mass of Mg) and chromium (Cr) is preferably 200 mass ppm or less, more preferably 150 mass ppm or less, particularly preferably 100 mass ppm or less, and 50 mass ppm or less with respect to the entire coloring composition. More preferably, 15 mass ppm or less is most preferable.
When it is not more than the above upper limit, the above-mentioned effect of the present invention is particularly exhibited.

<< Principle of action >>
The present invention is not limited to the range to which the following principle of action applies, but if the total mass of calcium (Ca) and iron (Fe) contained in the coloring composition (or the total mass of specific metal elements) is too large. The principle of action in which dispersion stability / solubility deteriorates, developability deteriorates, development time becomes long, and development residue is generated is presumed as follows.

That is, for example, the nitrogen moiety contained in the a monomer (preferably the structural unit represented by the general formula (1)) in the dispersant is adsorbed on the coloring material to improve the dispersibility of the coloring material, and the dispersion thereof. It is considered that the coloring material firmly surrounded by the agent is easily washed away while being adsorbed on the dispersant during development, and the generation of the residue derived from the coloring material is suppressed on the substrate.
However, if the total mass of calcium (Ca) and iron (Fe) or the total mass of the specific metal element is too large in the vicinity of the coloring material (if the total mass of calcium (Ca), iron (Fe) or the specific metal element is too large). , Adsorption of the dispersant to the coloring material is hindered, or the salt-type dispersant or acidic dye derivative that contributes to the improvement of dispersibility cannot contribute to the improvement of dispersibility by interacting with the specific metal element. It is thought that.

Further, if the total mass of the specific metal elements is too large, as described above, the coloring material is not suitably surrounded by the dispersant. Therefore, during development, the “coloring material preferably surrounded by the dispersant” is used. It is considered that the form makes it difficult for the developer to flow together with the developing solution, and a residue derived from the coloring material is likely to be generated on the substrate (development failure is likely to occur).

The coloring composition exhibits developability because it contains an alkali-soluble resin, but the above-mentioned "salt-type dispersant that does not suitably surround the coloring material" reduces the developability. Is also possible. Further, the influence of cations of a specific metal element having a valence of 2 or more on the alkali-soluble resin is also considered.
The effect on the decrease in developability is that divalent or higher cations (divalent) such as cations of specific metal elements are more important than monovalent cations such as ^{sodium ion (Na +} ) and potassium ion (K ^+). It is considered that the total amount of the above cations only and the content including trivalent cations) may be larger.

Therefore, it is considered that the coloring composition obtained by using the color material dispersion liquid having good dispersibility stability has good developability.

<< Preparation of coloring composition for color filter >>
In the preparation of the coloring composition of the present invention, at least an alkali-soluble resin and a polymerization initiator are blended with the coloring material, and if necessary, a polymerizable polyfunctional compound and "other components" are blended. Further, if necessary, it can be carried out by a method of further blending and mixing a solvent.
Since the coloring composition of the present invention is used by producing a coloring material liquid in advance, it is possible to effectively prevent agglomeration of the coloring material and uniformly disperse it.

Further, the color material liquid in the present invention can be set to a high color material concentration while maintaining a suitable viscosity range, suitable dispersion stability and solubility, and thus was obtained by using the color material liquid in the present invention. The coloring composition of the present invention can also achieve a high colorant concentration while maintaining a suitable viscosity range, suitable dispersion stability and solubility.

<Color filter>
A color filter usually has a transparent substrate, a light-shielding portion, and a colored layer. The color filter obtained by using the coloring composition of the present invention can realize high colorant density, high color rendering property, high contrast and the like, and is excellent in developability at the time of manufacturing a color filter.

<< Colored layer >>
The colored layer may be formed by curing the above-mentioned coloring composition of the present invention, and is not particularly limited, but is usually formed in the opening of the light-shielding portion on the transparent substrate described later, and the coloring composition. It is composed of three or more coloring patterns depending on the type of coloring material contained in the object.
The arrangement of the colored layers is not particularly limited, and may be, for example, a general arrangement such as a stripe type, a mosaic type, a triangle type, or a 4-pixel arrangement type. Further, the width, area and the like of the colored layer can be arbitrarily set.

The thickness of the colored layer is controlled by adjusting the coating method, coating conditions, solid content concentration of the coloring composition, viscosity, etc., but is usually in the range of 1 to 5 μm.
When the coloring material liquid of the present invention or the coloring composition of the present invention is used, a thin film (for example, up to 80 to 50%) with respect to the conventional thickness depends on the composition due to the high concentration of the coloring material in the solid content. It is possible to change. As a result, it exhibits the effects of high color rendering, no color mixing, high resolubility, less foreign matter generation, and high productivity.

The colored layer can be formed, for example, by the following method.
First, the above-mentioned coloring composition of the present invention is applied onto a transparent substrate described later by using a coating means such as a spray coating method, a dip coating method, a bar coating method, a roll coating method, a spin coating method, and a die coating method. , Form a wet coating.
Next, the wet coating film is dried using a hot plate, an oven, or the like, and then exposed to the wet coating film through a mask having a predetermined pattern to photopolymerize the alkali-soluble resin and the polymerizable polyfunctional compound.
Examples of the light source used for exposure include ultraviolet rays such as a low-pressure mercury lamp, a high-pressure mercury lamp, an ultra-high-pressure mercury lamp, and a metal halide lamp, and an electron beam.
In addition, heat treatment may be performed in order to accelerate the polymerization reaction after exposure.

Next, a coating film is formed in a desired pattern by developing with a developing solution to dissolve and remove the unexposed portion. As the developing solution, a solution in which an alkali is usually dissolved in water or a water-soluble solvent is used. The coloring material liquid and the coloring composition in the present invention are extremely excellent in developability.
After the development treatment, the developer is usually washed and the cured coating film of the resin composition is dried to form a colored layer. After the development treatment, a heat treatment may be performed to sufficiently cure the coating film.

<< Shading part >>
The light-shielding portion of the color filter is formed in a pattern on a transparent substrate described later.
The pattern shape of the light-shielding portion is not particularly limited, and examples thereof include a striped shape and a matrix shape.
Examples of the light-shielding portion include a black color material dispersed or dissolved in a binder resin; a metal thin film such as chromium and chromium oxide. This metal thin film may be a CrOx film (x is an arbitrary number) and a Cr film in which two layers are laminated.

When the light-shielding portion is obtained by dispersing or dissolving a black colorant in a binder resin, examples of the method for forming the light-shielding portion include a photolithography method using a resin composition for the light-shielding portion, a printing method, and an inkjet. The law etc. can be mentioned.

Further, in the above case, when the photolithography method is used as the method for forming the light-shielding portion, the binder resin is, for example, reactive with acrylate-based, methacrylate-based, polyvinyl chloride-based, or cyclized rubber-based. A photosensitive resin having a vinyl group is used.
In this case, the resin composition for the light-shielding portion containing a black pigment such as carbon black or titanium black as a pigment (coloring material) and a photosensitive resin includes a photopolymerization initiator, a sensitizer, a coatability improver, and a development improvement. Agents, cross-linking agents, polymerization inhibitors, plasticizers, flame retardants and the like may be added.

On the other hand, when the light-shielding portion is a metal thin film, as a method for forming the light-shielding portion, for example, a resist pattern obtained by forming a vacuum-deposited metal thin film by a vapor deposition method, a sputtering method or the like on the metal thin film by a photolithography method is masked. Examples include a method of metal etching.

The film thickness of the light-shielding portion is set to about 0.05 to 0.4 μm in the case of a metal thin film, and 0.5 to 0.5 to 0.5 in the case of a black colorant dispersed or dissolved in a binder resin. It is set at about 3 μm.

<< Transparent substrate >>
The transparent substrate in the color filter may be a substrate that is transparent to visible light, and is not particularly limited, and a transparent substrate used in a general color filter can be used. Specific examples thereof include non-flexible transparent rigid materials such as quartz glass, non-alkali glass, and synthetic quartz plates, and flexible transparent flexible materials such as transparent resin films and optical resin plates. Be done.
The thickness of the transparent substrate is not particularly limited, but a transparent substrate of, for example, about 100 μm to 1 mm can be used depending on the application.
In addition to the transparent substrate, light-shielding portion, and colored layer, the color filter of the present invention may have, for example, an overcoat layer, a transparent electrode layer, an alignment film, a columnar spacer, or the like. ..

<Display device>
Another aspect of the present invention is a display device having the above-mentioned color filter. The display device is not particularly limited, and examples thereof include a liquid crystal display and an organic EL display.
The color filter obtained by using the coloring composition containing the coloring material liquid in the present invention is suitably used for display display devices such as liquid crystal displays and organic EL displays.
The application of the color filter to a liquid crystal display or an organic EL display is usually performed by a known method.

Hereinafter, the present invention will be described in more detail with reference to experimental examples, but the present invention is not limited to these experimental examples as long as the gist thereof is not exceeded.
The coloring composition preparation examples 11 to 19 will be referred to below as reference examples.

Preparation Example 1
<Preparation of Dispersant A (Dispersant Solution A)>
<< Synthesis of Block Copolymer A >>
A 500 mL 4-port separable flask was depressurized and dried, and then the inside was replaced with argon (Ar).
While flowing argon, add 100 g of dehydrated tetrahydrofuran (THF), 2.0 g of methyltrimethylsilyldimethylketen acetal, 0.15 mL of a 1 M acetonitrile solution of tetrabutylammonium-3-chlorobenzoate (TBACB), and 0.2 g of mesitylene and stir. And mixed.
36.7 g of methyl methacrylate was added dropwise thereto over 45 minutes using a dropping funnel. Since heat was generated as the reaction proceeded, the temperature was kept below 40 ° C. by cooling with ice. After 1 hour, 13.3 g of dimethylaminoethyl methacrylate (DMAEMA) was added dropwise as the "a monomer" over 15 minutes. After reacting for 1 hour, 5 g of methanol was added to stop the reaction.

The solvent was removed under reduced pressure to obtain block copolymer A.
The mass average molecular weight determined by GPC measurement (NMP, LiBr10 mM) was 6000. The amine value was 95 mgKOH / g.
The obtained block copolymer A was dissolved in propylene glycol monomethyl ether acetate (PGMEA) to prepare a 60% by mass block copolymer solution.

<< Step of salting block copolymer (step of preparing basic block type dispersant) >>
Next, in a 100 mL round bottom flask, 5.0 parts by mass of the block copolymer solution obtained above was mixed with 23.76 parts by mass of PGMEA, and phenylphosphonic acid (Tokyo Kasei (Tokyo Kasei)), which is a salt-forming component, was mixed. (Manufactured by Co., Ltd.) was added in an amount of 0.94 parts by mass (0.5 mol equivalent to the DMAEMA unit of the block copolymer), and the mixture was stirred at a reaction temperature of 40 ° C. for 2 hours to obtain "Dispersant A". , Appropriately diluted with PGMEA to prepare a "dispersant solution A" having a solid content of 20% by mass.

Preparation Example 2
<Preparation of Dispersant B (Dispersant Solution B)>
<< Synthesis of Block Copolymer B >>
Add 250 parts by mass of dehydrated tetrahydrofuran (THF) and 0.6 parts by mass of lithium chloride to a 500 mL round bottom 4-port separable flask equipped with a cooling tube, addition funnel, nitrogen inlet, mechanical stirrer, and digital thermometer. , Sufficient nitrogen substitution was performed.
After cooling the reaction flask to -60 ° C, 4.9 parts by mass of butyllithium (15% by mass hexane solution), 1.1 parts by mass of diisopropylamine, and 1.0 part by mass of methyl isobutyrate were injected using a syringe. ..

As the "b monomer", 2.2 parts by mass of 1-ethoxyethyl methacrylate (EEMA), 18.7 parts by mass of 2-hydroxyethyl methacrylate (HEMA), and 12.8 parts by mass of 2-ethylhexyl methacrylate (EHMA). , 13.7 parts by mass of n-butyl methacrylate (BMA), 9.5 parts by mass of benzyl methacrylate (BzMA), and 17.5 parts by mass of methyl methacrylate (MMA) over 60 minutes using an addition funnel. Dropped.
After 30 minutes, 26.7 parts by mass of the "a monomer" dimethylaminoethyl methacrylate (DMAEMA) was added dropwise over 20 minutes.

After reacting for 30 minutes, 1.5 parts by mass of methanol was added to stop the reaction. The obtained precursor block copolymer THF solution was reprecipitated in hexane, purified by filtration and vacuum drying, and diluted with PGMEA to obtain a solid content of 30% by mass.
32.5 parts by mass of water was added, the temperature was raised to 100 ° C. and the reaction was carried out for 7 hours to deprotect the structural unit derived from EEMA to obtain a structural unit derived from methacrylic acid (MAA).
The obtained block copolymer PGMEA solution is reprecipitated in hexane, filtered, and purified by vacuum drying, and "A block containing the structural unit represented by the general formula (1)" and "carboxy group-containing monomer". A block copolymer B containing the derived structural unit and having a solvent-friendly B block was obtained.

The acid value of block copolymer B was 8 mgKOH / g, and the Tg was 38 ° C.
When the obtained block copolymer B was confirmed by GPC (gel permeation chromatography), the weight average molecular weight Mw was 7730. The amine value was 95 mgKOH / g.

<< Step of salting block copolymer (step of preparing basic block type dispersant) >>
Next, salt formation was carried out in the same manner as in Preparation Example 1 to prepare "dispersant B", which was further diluted with PGMEA to prepare "dispersant solution B" having a solid content of 20% by mass.
Similar to Preparation Example 1, 0.5 molar equivalent of phenylphosphonic acid (manufactured by Tokyo Kasei Co., Ltd.), which is a salt-forming component, was added to "DMAEMA unit which is a monomer" of block copolymer B.

Preparation Example 3
<Purification of organic pigments>
Put 2.0 parts by mass of the organic pigment (R-1) shown in Table 1 and 100 parts by mass of ion-exchanged water in a beaker, and stir with an ultrasonic homogenizer for 10 minutes by a batch method while keeping the temperature at 30 ° C. Filtration was performed using filter paper.
Manufacturing and sales company: ADVANTEC
Product name: FIKTER PAPER QUANTITAIVE ASHLESS
Standard: 5C, 150mm (100CIRCLES)

The method of performing the above washing (washing with water) twice is referred to as "purification method 1" (color material dispersion preparation example 1), and the method of performing the washing (water washing) 20 times is referred to as "purification method 2" (color material dispersion preparation example 2). ), The method of performing 30 times was referred to as "purification method 3" (color material dispersion liquid preparation example 3, color material dispersion liquid preparation example 9).

Further, using 2.0 parts by mass of the organic pigment (R-1) shown in Table 1, and using a Nutche funnel, 30,000 parts by mass of total ion-exchanged water was continuously flowed for 15 minutes and suctioned by a continuous method. It was washed by filtration (washed with water). Then, filtration was performed using the above filter paper.
The temperature of the flowed ion-exchanged water was 30 ° C. This method was referred to as "purification method 4" (color material dispersion liquid preparation example 4).

Purified organic pigments were prepared using purification methods 1-4.
No purification of organic pigments was carried out for Color Material Dispersion Liquid Preparation Examples 5 to 8 and Color Material Dispersion Liquid Preparation Examples 101 to 103.
Using the obtained (purified) organic pigments, color material dispersions were prepared as in the following Color Material Dispersion Preparation Examples 1 to 9 and Color Material Dispersion Preparation Examples 101 to 103.

Preparation Example 4
<(4-1) Synthesis of resin 1>
A mixture of 40 parts by mass of BzMA, 15 parts by mass of MMA, 25 parts by mass of MAA, and 3 parts by mass of AIBN was placed in a polymerization tank containing 150 parts by mass of PGMEA under a nitrogen stream at 100 ° C. Dropped over time. After completion of the dropping, the mixture was further heated at 100 ° C. for 3 hours to obtain a polymer solution.
The weight average molecular weight of the polymer in this polymer solution was 7,000.

Next, 20 parts by mass of GMA, 0.2 parts by mass of triethylamine, and 0.05 parts by mass of p-methoxyphenol were added to the obtained polymer solution, and the mixture was heated at 110 ° C. for 10 hours to obtain the main chain. Resin 1 was synthesized by reacting the carboxy group of methacrylic acid with the epoxy group of GMA.
During the reaction, air was bubbled into the reaction solution to prevent polymerization of GMA. The reaction was followed by measuring the acid value of the solution.

The obtained resin 1 is a resin in which a side chain having an ethylenic double bond is introduced into the main chain of a polymer formed by copolymerization of BzMA, MMA and MAA using GMA, and has a solid content of 40 mass. %, The acid value was 74 mgKOH / g, and the weight average molecular weight was 12000.

<< Abbreviated name >>
BzMA Benzyl Methacrylate MMA Methyl Methacrylate MAA Methacrylic Acid GMA Glycidyl Methacrylate AIBN Azobisisobutyronitrile PGMEA Propylene Glycol Monomethyl Ether Acetate

<(4-2) Synthesis of resin 2>
Resin 2 was obtained in the same manner as in (4-1) above except that 40 parts by mass of cyclohexyl methacrylate was used instead of 40 parts by mass of BzMA.
The obtained resin 2 had a solid content of 40% by mass, an acid value of 74 mgKOH / g, and a weight average molecular weight of 12000.

<(4-3) Synthesis of resin 3>
In the above (4-1), the resin 3 was obtained in the same manner as in the above (4-1) except that 40 parts by mass of styrene was used instead of 40 parts by mass of BzMA.
The obtained resin 3 had a solid content of 40% by mass, an acid value of 74 mgKOH / g, and a weight average molecular weight of 12000.

<Synthesis of (4-4) resin 4>
In the above (4-1), the resin 4 was obtained in the same manner as in the above (4-1) except that 40 parts by mass of dicyclopentanyl methacrylate was used instead of 40 parts by mass of BzMA.
The obtained resin 4 had a solid content of 40% by mass, an acid value of 74 mgKOH / g, and a weight average molecular weight of 12000.

<Synthesis of (4-5) resin 5>
Resin 5 was obtained in the same manner as in (4-1) above except that 40 parts by mass of N-phenylmaleimide (Tokyo Chemical Industry Co., Ltd.) was used instead of 40 parts by mass of BzMA in (4-1) above. ..
The obtained resin 5 had a solid content of 40% by mass, an acid value of 74 mgKOH / g, and a weight average molecular weight of 12000.

<Synthesis of (4-6) resin 6>
In (4-1) above, except that "20 parts by mass of styrene and 20 parts by mass of N-phenylmaleimide (Tokyo Chemical Industry Co., Ltd.)" were used instead of "40 parts by mass of BzMA". Resin 6 was obtained in the same manner as in 4-1).
The obtained resin 6 had a solid content of 40% by mass, an acid value of 74 mgKOH / g, and a weight average molecular weight of 12000.

<Synthesis of (4-7) resin 7>
Resin 7 was obtained in the same manner as in (4-1) above except that 40 parts by mass of phenoxyethyl methacrylate was used instead of 40 parts by mass of BzMA.
The obtained resin 7 had a solid content of 40% by mass, an acid value of 74 mgKOH / g, and a weight average molecular weight of 12000.

<Synthesis of (4-8) resin 8>
Resin 8 was obtained in the same manner as in (4-1) above except that 40 parts by mass of hydroxyethyl methacrylate was used instead of 40 parts by mass of BzMA in (4-1).
The obtained resin 8 had a solid content of 40% by mass, an acid value of 74 mgKOH / g, and a weight average molecular weight of 12000.

Preparation Example 5
<Synthesis of acidic dye derivative>
374.76 parts by mass of fuming sulfuric acid having a sulfur trioxide content of 11% by mass was stirred while cooling to 10 ° C., and 74.96 parts by mass of Pigment Yellow 138 was added. Then, the mixture was stirred at 90 ° C. for 6 hours. The obtained reaction solution was added to 1600 parts by mass of ice water, stirred for 15 minutes, and then the precipitate was filtered.
The obtained wet cake was washed 3 times with 800 parts by mass of demineralized water. The washed wet cake was vacuum dried at 80 ° C. to obtain a yellow pigment sulfonated derivative which is an acidic pigment derivative. The molecular weight was measured by TOF-MS, and it was confirmed that the product was a synthetic object.

<Preparation of color material liquid>
Color Material Dispersion Liquid Preparation Example 1
16.7 parts by mass of "PGMEA solution having a solid content of 40% by mass of resin 1 (BzMA / MMA / MAA / GMA = 40/15/25/20 (mass ratio), weight average molecular weight 12000)" obtained in Preparation Example 4. , 8.1 parts by mass of dispersant solution A and 62.2 parts by mass of PGMEA were stirred and mixed with a dissolver to uniformly dissolve.

To this solution, 12.7 parts by mass of the (purified) organic pigment obtained in Preparation Example 3 and 0.3 parts by mass of the acidic dye derivative obtained in Preparation Example 5 were added, and the zirconia beads 100 having a particle size of 2.0 mm were added. The mass portion was placed in a mayonnaise bottle and shaken with a paint shaker (manufactured by Asada Iron Works Co., Ltd.) for 1 hour as preliminary crushing.
Next, 200 parts by mass of zirconia beads having a particle size of 2.0 mm were taken out, and 200 parts by mass of zirconia beads having a particle size of 0.1 mm were added. Was prepared.

Color Material Dispersion Liquid Preparation Examples 2-7, 9
The coloring material and the dispersant were changed as shown in Table 1, and the (purified) organic pigments obtained in Preparation Example 3 were used in the same manner as in Preparation Example 1 of the coloring material dispersion liquid. Color material dispersions of 2 to 7 and 9 were prepared. In the coloring material dispersion liquid preparation examples 5 to 8, the organic pigment itself used is not washed with water because the content of the specific metal element is small.

Color Material Dispersion Liquid Preparation Example 8
The coloring material was changed to (G-1) as shown in Table 1, and the dispersant A (dispersant solution A) was changed to BYK21116 (basic block type dispersant manufactured by Big Chemie Japan Co., Ltd.) (dispersant in terms of solid content). A green color material dispersion was prepared in the same manner as in Preparation Examples 1 to 7 of the color material dispersion except that A and the dispersant B were used in the same mass). In the color material dispersion liquid preparation example 8, the organic pigment (G-1) used itself is not washed with water because the content of the specific metal element is small.

Color Material Dispersion Liquid Preparation Example 10
To a flask, 1000 parts by mass of methanol was added to 100 parts by mass of Acid Red 289 (AR289; xanthene dye, manufactured by Tokyo Kasei Co., Ltd.) purified by the above-mentioned "Purification Method 4" and dissolved in a magnetic stirrer. After confirming the dissolution, 29.9 parts by mass of concentrated hydrochloric acid was added and stirred to use the sulfonate contained in AR289 as a sulfo group. Further, 1000 parts by mass of PGMEA was added to this solution. Then, 276 parts by mass of the dispersant A was added and stirred. Then, a reflux condenser was connected, the temperature was raised to 80 ° C. in a water bath, and the reaction was carried out for 4 hours after reaching 80 ° C. Then, methanol was distilled off at 45 ° C. in a water bath by an evaporator, 1000 parts by mass of PGMEA was added, and the mixture was left to cool at room temperature for 16 hours. Next, the precipitate was filtered off, the filtrate was washed with about 100 parts by mass of PGMEA, the obtained filtrate was collected, and the color material dispersion liquid of Preparation Example 10 in which the dye was uniformly dispersed was used. Obtained.
The particle size distribution was measured using a Microtrack UPA particle size distribution meter (manufactured by Nikkiso Co., Ltd.). The evaluation was performed with a 50% average particle size, and the result of volume conversion (MV) was 78 nm.

Color material solution preparation example 11
A coloring material solution was prepared by dissolving 21.3 parts by mass of the dye (Y-2) (CI solvent yellow 162) in 100 parts by mass of diacetone alcohol. The dye (Y-2) used was purified by a recrystallization method using a mixed solvent of water and acetone (water: acetone = 50: 50 by mass ratio), and filtered.

Color Material Dispersion Liquid Preparation Examples 101-103
Color material dispersion liquid except that the coloring material was changed as shown in Table 1 and "an organic pigment that is not a purified organic pigment purified as in Preparation Example 3" was used (except that the organic pigment was not purified). Color material dispersions The color material dispersions of Preparation Examples 101 to 103 were prepared in the same manner as in Preparation Example 1.

<Preparation of coloring composition for color filter>
Coloring Composition Preparation Examples 11-19, 111-113
Coloring composition preparation examples 11 to 19 use the coloring material dispersions of coloring material dispersion preparation examples 1 to 9, respectively, and coloring composition preparation examples 111 to 113 are the colors of the coloring material dispersion preparation examples 101 to 103, respectively. Using the material dispersion, the solid content concentration was adjusted with PGMEA as needed, and each component was mixed with the composition shown below to prepare a coloring composition for a color filter.

-Coloring material dispersion prepared in Coloring Material Dispersion Preparation Examples 1 to 9 and Coloring Material Dispersion Preparation Examples 101 to 103 (solid content: 21.3% by mass): 52.7 parts by mass and coloring material dispersion, respectively. The same resin as the resin 1 used in Preparation Example 1 was used as the "alkali-soluble resin", and the alkali-soluble resin: 3.04 parts by mass, polymerizable polyfunctional compound (manufactured by Toa Synthetic Co., Ltd., Aronix M-403, photocured). (Sex polyfunctional monomer): 2.84 parts by mass, photopolymerization initiator (BASF, Irgacure 907, photopolymerization initiator): 0.89 parts by mass, surfactant (manufactured by DIC Co., Ltd., Megafuck) F-559): 0.03 parts by mass, PGMEA: 40.5 parts by mass, silane coupling agent (manufactured by Shinetsu Silicone Co., Ltd., KBM-503): 0.2 parts by mass

Coloring Composition Preparation Example 21
A coloring composition for a color filter was prepared in the same manner as in the case of the coloring composition preparation example 17, except that the following (change 1) and (change 2) were changed in the coloring composition preparation example 17.

(Change 1)
Instead of "photopolymerization initiator (BASF, Irgacure 907, photopolymerization initiator): 0.89 parts by mass", the following photopolymerization initiator and mercapto compound were used.
-Photopolymerization initiator (ADEKA, NCI-831): 0.36 parts by mass-Photopolymerization initiator (BASF, Irgacure 369): 0.27 parts by mass-Photopolymerization initiator (BASF, Irgacure) 907): 0.27 parts by mass ・ Pentaerythritol tetrakis (3-mercaptopropionate) (manufactured by SC Organic Chemistry Co., Ltd., PEMP): 0.18 parts by mass

(Change 2)
As a solvent, instead of "PGMEA 40.5 parts by mass", "PGMEA 27.9 parts by mass and 3-methoxy-3-methyl-1-butyl acetate (trade name: Solfit AC, manufactured by Kuraray) 12.6 parts by mass" It was used.

Coloring Composition Preparation Examples 22-26, 32
A coloring composition for a color filter was prepared in the same manner as in the case of the coloring composition preparation example 21 except that the alkali-soluble resin was changed as shown in Table 3.

Coloring Composition Preparation Examples 27-28
A coloring composition for a color filter was prepared in the same manner as in the case of the coloring composition preparation example 26, except that the mercapto compound was changed as shown in Table 3.

Coloring Composition Preparation Example 29
A coloring composition for a color filter was prepared in the same manner as in Preparation Example 21 of the coloring composition except that pentaerythritol tetrakis (3-mercaptopropionate) was not used.

Coloring Composition Preparation Example 30
A coloring composition for a color filter was prepared in the same manner as in the case of the coloring composition preparation example 21 except that a mixture of the resin 3 and the resin 5 was used as the alkali-soluble resin instead of the resin 1.
Resin 3: Resin 5 = 50:50 (mass ratio) was used.

Coloring Composition Preparation Example 31
The same as in the case of the coloring composition preparation example 21 except that the coloring material dispersion prepared in the coloring material dispersion preparation example 10 was used instead of the coloring material dispersion prepared in the coloring material dispersion preparation example 7. , A coloring composition for a color filter was prepared.

Coloring Composition Preparation Example 33
In the coloring composition preparation example 21, a coloring composition for a color filter was prepared in the same manner as in the case of the coloring composition preparation example 21, except that the photopolymerization initiator was changed as shown in Table 3.

Coloring Composition Preparation Example 34
Color material solution The color was prepared in the same manner as in Preparation Example 21 except that the color material solution prepared in Preparation Example 11 was used instead of the color material dispersion prepared in Preparation Example 7. A coloring composition for a filter was prepared.

Coloring Composition Preparation Example 121
A coloring composition for a color filter was prepared in the same manner as in the case of Coloring Composition Preparation Example 27, except that the alkali-soluble resin was changed as shown in Table 3.

Coloring Composition Preparation Example 122
In the coloring composition preparation example 111, the coloring composition for a color filter is prepared in the same manner as in the case of the coloring composition preparation example 111, except that the following (change 1') and the above-mentioned (change 2) are changed. Prepared.

(Change 1')
Instead of "photopolymerization initiator (BASF, Irgacure 907, photopolymerization initiator): 0.89 parts by mass", the following photopolymerization initiator was used.
-Photopolymerization initiator (ADEKA, NCI-831): 0.36 parts by mass-Photopolymerization initiator (BASF, Irgacure 369): 0.27 parts by mass-Photopolymerization initiator (BASF, Irgacure) 907): 0.27 parts by mass

Measurement example <Quantification of metal in color material solution>
Using an ICP (Inductively Coupled Plasma) emission spectroscopic analyzer (Varian, Vista-PRO), calcium (Ca), iron (Fe), magnesium (Ca), iron (Fe), magnesium (color material dispersion liquid or color material solution) in the color material solution (color material dispersion liquid or color material solution) The contents of Mg), aluminum (Al) and chromium (Cr) were quantified.
The measurement sample was prepared as follows. That is, about 1 g (0.5 to 1.5 g) of the coloring material liquid is precisely weighed, heated on a burner and in an electric furnace (700 ° C.), incinerated, and then aqua regia is added to make it hot. Heated on a plate to dissolve.
The obtained solution was diluted with ultrapure water to make a total of 50.000 g as a measurement sample.

The detection limit of ICP emission spectroscopic analysis in the present invention is less than 0.01 ppm.
“0 mass ppm” in Tables 1 to 3 indicates that rounded to the nearest “1” is “0”, that is, less than 0.5 mass ppm. Since the measurement sample is diluted about 50 times as described above, "0" in the table therefore indicates that it is below the above detection limit of the measuring device.

Evaluation example <Evaluation method of "dispersion stability" of color material dispersion liquid>
Color material dispersion The color material dispersion prepared in the preparation example was stored at room temperature (25 ° C.), and the viscosities were measured 1 day and 1 month after the preparation. The viscosity was measured at 25.0 ± 1.0 ° C. using a vibration viscometer (VM-200T2 manufactured by SEKONIC Corporation), and the value 30 seconds after the start of measurement was adopted.

<< Judgment Criteria >>
The viscosity after 1 day of preparation was compared with the viscosity after storage for 1 month, and the determination was made as follows.
AA: Viscosity change exceeds 3% and within 5% A: Viscosity change exceeds 3% and within 5% B: Viscosity change exceeds 5% and within 7% C: Viscosity change exceeds 7% and within 10% D: Viscosity Change exceeds 10%

The results are shown in Table 1. If the change in viscosity is within 7%, that is, if the "dispersion stability" is "B" or more, the stability is excellent and it is evaluated to be at a practical level.

<Evaluation method of "optical characteristics" of coloring composition for color filter>
The coloring composition obtained in each coloring composition preparation example is put on a glass substrate (manufactured by NH Techno Glass Co., Ltd., "NA35") using a spin coater to obtain a desired color (red coloring layer:) after post-baking. The coating was applied so that x = 0.650 with a C light source, the green colored layer: y = 0.450, and the yellow colored layer: y = 0.500). After heat-drying on a hot plate at 80 ° C. for 3 minutes ^{, ultraviolet rays of 60 mJ / cm 2} were irradiated using an ultra-high pressure mercury lamp, and then post-baked in a clean oven at 230 ° C. for 25 minutes.

The contrast, chromaticity (x, y), and brightness (Y) of the obtained colored film were measured. The contrast was measured using a "contrast measuring device CT-1B" manufactured by Tsubosaka Electric Co., Ltd., and the chromaticity and brightness were measured using a "microscopic differential light measuring device OSP-SP200" manufactured by Olympus Corporation.
The results are shown in Tables 2-5.

<< Judgment Criteria >>
The contrast is evaluated to be excellent if the red colored layer is 12,000 or more, the green colored layer is 18,000 or more, and the yellow colored layer is 10,000 or more.

<Evaluation method of "drying unevenness" of coloring composition for color filter>
A coloring composition for a color filter was applied to a glass substrate using a die coater, and then vacuum-baked until the degree of vacuum reached 0.2 torr to form a coating film having a film thickness of 2.0 μm. Then, the obtained substrate was observed using an interference fringe inspection lamp (Na lamp), and the presence or absence of drying unevenness generated in the coating film was visually evaluated.

<< Judgment Criteria >>
AA: No uneven drying is observed.
A: Slight drying unevenness is observed.
B: Many uneven drying is observed.

<Evaluation method 1 (development speed) of "developability" of coloring composition for color filter>
The coloring composition for a color filter obtained in each coloring composition preparation example was applied onto a glass substrate using a spin coater, and then dried at 80 ° C. for 3 minutes using a hot plate.
^{This colored layer is exposed to ultraviolet rays of 60 mJ / cm 2} using an ultra-high pressure mercury lamp via an independent fine line pattern photomask having a line width of 1 μm to 100 μm, whereby a thickness of 2.0 μm is obtained on a glass substrate. A colored layer was formed.

Next, a 0.05 mass% potassium hydroxide (KOH) aqueous solution was used as a developing solution for spin development, contacted with the developing solution, and then washed with pure water for development treatment, pattern formation, and developability. Was evaluated.

In the above development process, the time until the unexposed portion was dissolved and removed was measured. The completion of development was visually observed, and the development time was determined according to the following criteria.

<< Judgment Criteria >>
AA: Less than 40 seconds A: 40 seconds or more and less than 60 seconds B: 60 seconds or more and less than 80 seconds C: 80 seconds or more and less than 120 seconds D: 120 seconds or more

The results are shown in Tables 2-3.
If the development time is less than 40 seconds (AA), the "development speed" is particularly excellent, and if the development time is 40 seconds or more and less than 60 seconds (A), the "development speed" is more excellent and the development time is better. If it is 60 seconds or more and less than 80 seconds (B), the "development speed" is excellent, and all of AA, A, and B are good and are judged to be at a practical level.
On the other hand, if the development time is 80 seconds or more (C, D), the "development speed" is inferior and it is determined that the development time is not at a practical level.

<Evaluation method 2 of "developability" of coloring composition for color filter (development residue)>
The photosensitive coloring resin composition for a color filter obtained in each coloring composition preparation example was applied onto a glass substrate using a spin coater, and then dried at 60 ° C. for 3 minutes using a hot plate. A colored layer having a thickness of 2.5 μm was formed. The glass plate on which the colored layer was formed was shower-developed for 60 seconds using a 0.05 mass% potassium hydroxide aqueous solution as an alkaline developer. After visually observing the unexposed portion (50 mm × 50 mm) of the glass substrate after the formation of the colored layer, wipe it off sufficiently with a lens cleaner (manufactured by Toray Industries, Inc., trade name Toraysee MK Clean Cloth) soaked in ethanol. The degree of coloring of the lens cleaner was visually observed.

<< Judgment Criteria >>
AA: No development residue was visually confirmed and the lens cleaner was not colored at all. A: No development residue was visually confirmed and the lens cleaner was slightly colored. B: Development residue was slightly confirmed visually. C: The development residue was visually confirmed and the coloring of the lens cleaner was confirmed.

The results are shown in Tables 2-3.
If the above determination result is A, B or C, it can be practically used, but if the determination result is B, and further A, the effect is more excellent.

<Evaluation method of "resolubility" of coloring composition for color filter>
The tip of a glass substrate having a width of 0.5 cm and a length of 10 cm was immersed in a coloring composition for a color filter and applied to a portion of the glass substrate having a length of 1 cm. The pulled glass substrate was placed in a constant temperature and humidity chamber so that the glass surface was horizontal, and dried at a temperature of 23 ° C. and a humidity of 80% RH for 30 minutes. Next, the glass substrate to which the dried coating film was attached was immersed in PGMEA for 15 seconds. At this time, the redissolved state of the dry coating film was visually discriminated and evaluated. The results are also shown in Table 3.

<< Judgment Criteria >>
AA: The dry coating film is completely dissolved A: A thin piece of the dry coating film is formed in the solvent, and the thin section is eventually dissolved B: A thin piece of the dry coating film is formed in the solvent and the solution is colored C: In the solvent Any AA, A or B in which flakes of the dry coating film are formed and the solution is not colored can be used without any problem in practical use.

<Evaluation method of "water stain" of coloring composition for color filter>
The coloring composition for a color filter obtained in each coloring composition preparation example is applied onto a glass substrate using a spin coater to form a colored layer having a thickness of 1.6 μm after post-baking, and then hot. A colored layer was formed on the glass substrate by drying the glass at 60 ° C. for 3 minutes using a plate and ^{irradiating the entire surface with ultraviolet rays of 60 mJ / cm 2 using an ultrahigh pressure mercury lamp without using a photomask.} Next, spin-development using 0.05 wt% potassium (KOH) as a developing solution, indirect solution in the developing solution for 60 seconds, and then washing with pure water for development treatment, and rotating the washed substrate for 10 seconds to add water. Immediately after centrifugation, the contact angle of pure water was measured as shown below to evaluate water stains.
To measure the contact angle of pure water, 1.0 μL of pure water is dropped on the surface of the colored layer immediately after the water is centrifugally removed, and the static contact angle 10 seconds after the drip is measured according to the θ / 2 method. I measured it. The measuring device was a contact angle meter DM 500 manufactured by Kyowa Interface Science Co., Ltd..

<< Judgment Criteria >>
AAA: Contact angle 90 degrees or more AA: Contact angle 85 degrees or more and less than 90 degrees A: Contact angle 80 degrees or more and less than 85 degrees B: Contact angle 65 degrees or more and less than 80 degrees C: Contact angle 50 degrees or more and less than 65 degrees D: Contact If the angle is less than 50 degrees and the water stain evaluation standard is B or more, it can be used practically, but if the evaluation result is A, the water stain generation suppressing effect is high, and if it is AA or AAA, the water stain generation suppressing effect is extremely high. ..

The color materials in Table 1 are as follows. The same applies to Tables 2 and 3.
"R-1" (organic pigment): C.I. I. It is R177, and is a chromoftal red A3B manufactured by BASF.
"R-2" (organic pigment): C.I. I. It is R177, and is a chromoftal red A2B manufactured by BASF.
"R-3" (organic pigment): C.I. I. It is R177, and is Irgazine Red A2BN manufactured by BASF.
"R-4" (organic pigment): C.I. I. It is R177, and is FAST RED A3B manufactured by Yuri Kako Co., Ltd.
"Y-1" (organic pigment): C.I. I. It is Y138, and is Paliotor Yellow K0961HD manufactured by BASF.
"G-1" (organic pigment): C.I. I. It is G58, and is FASTOGEN Green A110 manufactured by DIC Corporation.
"V-1" (dye): C.I. I. Acid Red 289, AR289 manufactured by Tokyo Kasei Co., Ltd.
"Y-2" (dye): C.I. I. Solvent Yellow 162, NEPTUN YELLOW 075 manufactured by BASF.

The contents of sodium (Na) and potassium (K) are not shown in Table 1, but were almost the same in all the examples.
Although not shown in Table 1, in the coloring material dispersion liquid preparation examples 1 to 9, the initial viscosity of the color material dispersion liquid was as low as 20 mPa · s or less, which was within the practical range.
The viscosity was measured at 25.0 ± 1.0 ° C. using a vibration viscometer (VM-200T2 manufactured by SEKONIC). If the viscosity of the color material dispersion is 20 mPa · s or less, it is within the practical range.

In Table 3, the photopolymerization initiator is as follows.
"NCI-831": Oxime ester-based photopolymerization initiator (manufactured by ADEKA Corporation)
"Irg369": α-aminoketone-based photopolymerization initiator (Irgacure 369, manufactured by BASF)
"Irg907": α-aminoketone-based photopolymerization initiator (Irgacure 907, manufactured by BASF)

<Results on color material dispersion>
As can be seen from Table 1, the total mass of calcium (Ca) and iron (Fe) contained in the color filter color material dispersion liquid is 180 mass ppm or less with respect to the entire color filter color material dispersion liquid. In each of the dispersion liquid preparation examples, the dispersion stability was judged as "AA", "A" or "B", which was a practical level.
On the other hand, in each of the color material dispersion preparation examples in which the total mass of calcium (Ca) and iron (Fe) is more than 180 mass ppm with respect to the entire color filter dispersion liquid, the dispersion stability is "C". Or it was a "D" judgment and did not reach the practical level.
It was also found that the above results can be said regardless of the type of coloring material. Further, even if the total concentration of calcium (Ca) and iron (Fe) is lowered by washing (color material dispersion preparation examples 1 to 4, 9), even if the total concentration is low from the beginning (color material dispersion preparation). Examples 5-8) showed that the dispersion stability was high. It was also found that the above tendency can be said regardless of the type of coloring material.

Further, before washing with water, the total concentration of calcium (Ca) and iron (Fe) is more than 180 mass ppm with respect to the entire color material dispersion liquid for the color filter, and the dispersion stability is judged as "C". Liquid Preparation Example 101 A Color Material Dispersion Solution Preparation Example in which the total concentration of calcium (Ca) and iron (Fe) in the color material dispersion liquid was reduced to 180 mass ppm or less by washing the "organic pigment (R-1) of Liquid Preparation Example 101" with water. In all of 1 to 4 and 9, the dispersibility was judged to be "A" or "AA".

When the number of washings (washing with water) was increased, the dispersion stability was improved (color material dispersion preparation examples 1 to 3), and when the washing (washing with water) was performed by the continuous method, the dispersion stability was excellent (color material dispersion preparation example 4). ).
Further, when the color material dispersion liquid preparation example 3 and the color material dispersion liquid preparation example 9 in which the color material (organic pigment) and the purification method are unified and only the dispersant is changed are compared, both of them are judged as "AA". The color material dispersion preparation example 9 using the dispersant B was superior in dispersion stability to the color material dispersion preparation example 3 using the dispersant A.

<Results on coloring composition for color filter>
Further, as can be seen from Table 2, the total mass of calcium (Ca) and iron (Fe) contained in the coloring composition for a color filter is 120% by mass or less with respect to the entire coloring composition for a color filter. In each of the product preparation examples, the development speed was judged as "AA", "A" or "B", and was excellent or at a practical level. In addition, all the coloring compositions were excellent in stability.
On the other hand, in each of the colored composition preparation examples in which the total mass of calcium (Ca) and iron (Fe) is more than 120 mass ppm with respect to the entire colored composition for the color filter, the developing speed is "C" or "D". It was a judgment and did not reach the practical level. It was also found that the above tendency can be said regardless of the type of coloring material.

Further, comparing the coloring composition preparation example 13 in which the coloring material (organic pigment) and the purification method are unified and only the dispersant is changed and the coloring composition preparation example 19, the coloring composition preparation example 19 using the dispersant B is compared. The development speed was better than that of the colored composition preparation example 13 using the dispersant A, and the judgment was "AA".

As can be seen from Table 3, when a coloring composition containing an alkali-soluble resin having a hydrocarbon ring is used after reducing the specific metal element (coloring composition preparation examples 21 to 34), all of them are development residues. In addition, the occurrence of water stains tends to be suppressed. In particular, in the case of a coloring composition containing an alkali-soluble resin having a maleimide structure represented by the general formula (6) (coloring composition preparation examples 25 to 28, 30), the development residue could be extremely reduced. ..
Further, when the coloring composition contained the mercapto compound (coloring composition preparation examples 21 to 28), the occurrence of water stains could be suppressed as compared with the case where the coloring composition did not contain the mercapto compound (coloring composition preparation example 29).
In the coloring composition Preparation Example 122 containing a large amount of the first specific metal element (Ca and Fe), uneven drying occurred, the development speed was slow, and the development residue was large.

Since the coloring composition in which the specific metal content of the present invention is defined has a high colorant concentration and a low viscosity, it is possible to reduce the film thickness of the color filter, and therefore it is widely used in the manufacture of various displays and the like. Is to be done.

Claims (20)

A coloring composition containing a coloring material, a solvent, a polymerization initiator and an alkali-soluble resin, wherein the total mass of calcium (Ca) and iron (Fe) contained in the coloring composition is based on the entire coloring composition. The alkali-soluble resin has a hydrocarbon ring, the solvent contains a glycol ether acetate solvent as the first solvent, and the boiling point is 172 ° C. or higher and 200 as the second solvent. A coloring composition for a color filter, which comprises a solvent of ℃ or less. The coloring composition for a color filter according to claim 1, wherein the content of the solvent having a boiling point of 172 ° C. or higher and 200 ° C. or lower is 1% by mass or more and 30% by mass or less in the total solvent. The solvent having a boiling point of 172 ° C. or higher and 200 ° C. or lower is at least one selected from the group consisting of diethylene glycol ethyl methyl ether, 3-methoxy-3-methyl-1-butyl acetate, and 3-methoxybutyl acetate. The coloring composition for a color filter according to claim 1 or 2. Further, any one of claims 1 to 3, wherein the total mass of magnesium (Mg) and chromium (Cr) contained in the coloring composition is 135 mass ppm or less with respect to the entire coloring composition. The coloring composition for a color filter according to. Further, claims 1 to 4, wherein the total mass of magnesium (Mg), aluminum (Al), and chromium (Cr) contained in the coloring composition is 135 mass ppm or less with respect to the entire coloring composition. The coloring composition for a color filter according to any one of the claims. The coloring composition for a color filter according to any one of claims 1 to 5, wherein the alkali-soluble resin has an acid value of 30 to 200 mgKOH / g. The coloring composition for a color filter according to any one of claims 1 to 6, wherein the alkali-soluble resin has a maleimide structure represented by the following general formula (6).

[In the general formula (6), ^RM is a hydrocarbon group having a cyclic structure which may be substituted. ] The coloring composition for a color filter according to any one of claims 1 to 7, wherein the alkali-soluble resin has a crosslinked cyclic aliphatic group. The coloring composition for a color filter according to any one of claims 1 to 8, wherein the alkali-soluble resin has a styrene constituent unit. The coloring composition for a color filter according to any one of claims 1 to 9, wherein the alkali-soluble resin has a structural unit represented by the following general formula (7).

[In the general formula (7), X is a hydrogen atom or a methyl group. Further, Y is a group having a phenoxyethyl structure represented by the following general formula (8). ]

[In the general formula (8), n is an integer of 1 to 8. ] The coloring composition for a color filter according to any one of claims 1 to 10, wherein the alkali-soluble resin has two or more structural units having a hydrocarbon ring. The claim according to any one of claims 1 to 11, wherein two or more kinds of alkali-soluble resins having a hydrocarbon ring are contained, and at least two kinds of alkali-soluble resins have different constituent units from each other. Coloring composition for color filters. The coloring composition for a color filter according to any one of claims 1 to 12, which contains an oxime ester-based photopolymerization initiator. Claim 1 containing one or more compounds selected from the group consisting of an α-aminoketone-based photopolymerization initiator, a biimidazole-based photopolymerization initiator, a thioxanthone-based photopolymerization initiator, and an acylphosphine oxide-based photopolymerization initiator. The coloring composition for a color filter according to any one of claims 13. The coloring composition for a color filter according to any one of claims 1 to 14, which contains a mercapto compound. The coloring composition for a color filter according to any one of claims 1 to 15, which contains a dispersant containing a structural unit represented by the following general formula (1).

[In the general formula (1), R ¹ is a hydrogen atom or a methyl group, A is a divalent linking group, and R ² and R ³ are each independently a hydrocarbon group which may contain a hydrogen atom or a hetero atom. Represented, R ² and R ³ may be combined with each other to form a ring structure. ] At least a part of the structural units represented by the general formula (1) in the dispersant is represented by the following general formulas (2) to (4) so that the nitrogen of the structural unit becomes ammonium ions. The coloring composition for a color filter according to claim 16, which is a structural unit formed by binding one or more compounds selected from the group consisting of the above compounds to form a salt.

[In the general formula (2), ^Ra has a linear, branched or cyclic alkyl group having 1 to 20 carbon atoms; may have a substituent, a vinyl group, a phenyl group or a benzyl group; or −. represents O-R ^e, R ^e is, having 1 to 20 carbon atoms, straight-chain, branched or cyclic alkyl group; which may have a substituent, a vinyl group, a phenyl group or a benzyl group; or a carbon number Represents a (meth) acryloyl group via 1 to 4 alkylene groups. ]

[In the general formula (3), R ^b , R ^b'and R ^{b "} are independently having a hydrogen atom; an acidic group or an ester group thereof; a direct group having 1 to 20 carbon atoms which may have a substituent. Chain, branched or cyclic alkyl group; may have a substituent, a vinyl group, a phenyl group or a benzyl group; or —OR ^f , where R ^f may have a substituent, a carbon. Linear, branched or cyclic alkyl groups of number 1 to 20; may have substituents, vinyl, phenyl or benzyl group; or (meth) acryloyl via an alkylene group of 1 to 4 carbons. Represents a group, where X represents a chlorine atom, a bromine atom or an iodine atom.]

[In the general formula (4), R ^c and R ^d may each independently have a hydrogen atom; a hydroxyl group; a linear, branched or cyclic alkyl group having 1 to 20 carbon atoms; a substituent. , Vinyl group, phenyl group or benzyl group; or —OR ^g ; R ^g may have a linear, branched or cyclic alkyl group having 1 to 20 carbon atoms; It represents a vinyl group, a phenyl group or a benzyl group; or a (meth) acryloyl group via an alkylene group having 1 to 4 carbon atoms. However, ^{at least one of R c} and R ^d contains a carbon atom. ] Any one of claims 1 to 17, wherein the coloring material is one or more organic pigments selected from the group consisting of anthraquinone pigments, diketopyrrolopyrrole pigments, azo pigments, quinophthalone pigments, dioxazine pigments and phthalocyanine pigments. The coloring composition for a color filter according to the claim. A color filter having a colored layer which is a cured product of the coloring composition for a color filter according to any one of claims 1 to 18. A display device having the color filter according to claim 19.