JP2002040230A - Color filter and manufacturing method thereof - Google Patents

Abstract

(57) [Problem] In a color filter having no light-shielding portion, the precision, which is a problem when a color filter is manufactured by a printing method, is easily changed into a pattern shape by the printing method and the surface wettability. It is an object of the present invention to provide a color filter which can be mass-produced with high accuracy by improving a combination with a photocatalyst-containing layer which can be produced, and a method of manufacturing the same. SOLUTION: A transparent substrate, a pixel portion in which a plurality of colors are provided in a predetermined pattern by a printing method using a relief printing plate, a lithographic printing plate, a stencil printing plate or an intaglio printing plate on the transparent substrate, and a pixel portion provided for forming the pixel portion. The above object is provided by providing a color filter comprising at least a photocatalyst and a binder, and a photocatalyst-containing layer in which wettability is changed so that a contact angle with a liquid is reduced by irradiation of energy. To achieve.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color filter suitable for a color liquid crystal display, which is obtained by coloring a pixel portion by a printing method using letterpress, planographic, stencil or intaglio, and a method of manufacturing the same. .

[0002]

2. Description of the Related Art In recent years, with the development of personal computers, especially portable personal computers, the demand for liquid crystal displays, especially color liquid crystal displays, has been increasing. However, since the color liquid crystal display is expensive, there is an increasing demand for cost reduction, and in particular, there is a high demand for cost reduction for color filters having high specific gravity.

Such a color filter usually has three primary color patterns of red (R), green (G), and blue (B), and has electrodes corresponding to respective pixels of R, G, and B. Is turned on and off, the liquid crystal operates as a shutter, and light passes through each pixel of R, G, and B to perform color display.

A conventional color filter manufacturing method includes, for example, a dyeing method. In this dyeing method, first, a water-soluble polymer material, which is a material for dyeing, is formed on a glass substrate, and this is patterned into a desired shape by a photolithography process, and the obtained pattern is immersed in a dyeing bath. To obtain a colored pattern. This is repeated three times to form R, G, and B color filter layers.

Another method is a pigment dispersion method. In this method, first, a photosensitive resin layer in which a pigment is dispersed is formed on a substrate, and a monochromatic pattern is obtained by patterning the photosensitive resin layer. This process is further repeated three times to form R, G, and B color filter layers.

Still other methods include an electrodeposition method and a method of dispersing a pigment in a thermosetting resin, performing R, G, and B printing three times, and then thermosetting the resin. it can. However, in any of the methods, the same process must be repeated three times in order to color the three colors of R, G, and B, which increases the cost and reduces the yield due to the repeated processes. There's a problem.

On the other hand, attempts have been made to manufacture color filters by a printing method. Although the production by the printing method is a method suitable for mass production, there is a problem that the color filter obtained by printing is inferior to the method using photolithography described above in terms of accuracy.

In such a color filter, a light-shielding portion called a black matrix is usually formed at a portion corresponding to a boundary portion of a pixel portion. This light-shielding portion is usually formed on the color filter side, but may be provided on the substrate side arranged to face this color filter when used as a liquid crystal panel. In the case where the light-shielding portion is formed on the opposite substrate side, a color filter without the light-shielding portion is manufactured. The above-described problem is a serious problem not only in a color filter having a light-shielding portion but also in a color filter without such a light-shielding portion.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and in a color filter having no light-shielding portion, the accuracy which is a problem when manufacturing a color filter by a printing method is described. A color filter capable of mass-producing a color filter with improved accuracy by combining a printing method and a photocatalyst-containing layer capable of easily changing the surface wettability into a pattern, and a method for manufacturing the same The main purpose is to provide.

[0010]

In order to achieve the above object, according to the present invention, there is provided the present invention, wherein a transparent substrate and a plurality of colors are formed on the transparent substrate by a printing method using letterpress, planographic, stencil or intaglio. A pixel portion provided in a predetermined pattern, and provided for forming the pixel portion, at least a photocatalyst and a binder, and the wettability changes so that a contact angle with a liquid is reduced by irradiation of energy. A color filter comprising: a photocatalyst-containing layer.

As described above, the present invention is characterized in that a pixel portion is formed by a printing method, and a photocatalyst-containing layer is formed in order to form the pixel portion. Therefore, since the change in the wettability of the photocatalyst-containing layer can be used, the pixel portion can be accurately formed even when the printing method is used. Therefore, even when the printing method is used, it is possible to provide a high-quality color filter free from problems such as color omission and color unevenness.

In this case, the photocatalyst-containing layer may be formed on the transparent substrate, and the pixel portion may be provided on the photocatalyst-containing layer. . With such a configuration,
The wettability of the photocatalyst-containing layer in the portion where the pixel portion is provided in advance may be an ink-philic region having a small contact angle with the liquid, and the photocatalyst-containing layer in the other portion may be an ink-repellent region with a large contact angle with the liquid. it can. By coloring the portion of the lipophilic region where the pixel portion is provided by various printing methods, the ink adheres only to the lipophilic region having a small contact angle with the liquid, so that the ink spreads uniformly over the entire pixel portion, There is no ink-free area or uneven color in the pixel portion, and no ink adheres to other ink-repellent areas.

Further, as described in claim 3, it is preferable that the distance between the pixel portions is 2 μm or less. Since the color filter of the present invention is of a type in which a black matrix (light shielding portion) is not formed, it is necessary to use the color filter in combination with a black matrix provided on a substrate on the backlight side in order to actually use the liquid crystal filter. There is. At this time, if the distance between the pixel units is large, unless the positional accuracy with the substrate on the backlight side on which the black matrix is formed is kept high, the backlight transmits between the pixel units and so-called color loss occurs. there is a possibility.
Therefore, the distance between the pixel portions is preferably as small as possible, and specifically, is preferably 2 μm or less. In addition, by reducing the distance between the pixel portions in this manner, it is possible to obtain smoothness of the coloring layer including the pixel portions.

Further, as described in claim 4, an ink-repellent convex portion may be formed on the photocatalyst containing layer at a boundary portion of the pixel portion. By forming the ink-repellent convex portions as described above, when forming the pixel portions by applying ink by various printing methods, the ink-repellent convex portions are formed at the boundary portions of the pixel portions, so that the colored portions are colored. In this case, it is preferable because problems such as mixing of ink do not occur.

On the other hand, in the present invention, as described in claim 5, a pixel portion may be formed on the transparent substrate, and the photocatalyst containing layer may be provided at a boundary portion of the pixel portion. .

In this case, the wettability of the boundary portion of the pixel portion on the photocatalyst-containing layer is set as an ink-repellent region having a contact angle with the liquid larger than that of the pixel portion forming portion on the transparent substrate on which the pixel portion is formed. This makes it difficult for the ink to move beyond the boundary of the pixel portion having ink repellency when the portion where the pixel portion is provided (pixel portion forming portion) is colored by various printing methods. A color filter free from inconvenience such as color mixing can be provided. Thereafter, the photocatalyst-containing layer at the boundary of the pixel portion is formed as an ink-philic region having a small contact angle with the liquid, so that there is no problem in covering the entire protective layer, and a high-quality color filter can be obtained. Is obtained.

In this case, it is preferable that the wettability on the transparent substrate is less than 10 degrees as a contact angle with a liquid having a surface tension of 40 mN / m. When ink is applied to the pixel portion forming portion on the transparent substrate by various printing methods, the ink is uniformly distributed in the pixel portion forming portion,
This is because it is possible to suppress the possibility of causing a problem such as uneven color.

In the color filter according to any one of the first to sixth aspects, as described in the seventh aspect, the photocatalyst containing layer contains fluorine, and the photocatalyst containing layer contains fluorine. The photocatalyst-containing layer is preferably formed such that when the layer is irradiated with energy, the action of the photocatalyst causes the fluorine content on the surface of the photocatalyst-containing layer to be lower than before the energy irradiation.

Thus, the color filter of the present invention is
Since the fluorine content of the energy-irradiated portion on the photocatalyst-containing layer formed on the transparent substrate is configured to decrease, a pattern consisting of the portion having a reduced fluorine content is formed by pattern irradiation with energy. can do. When the fluorine content is reduced, the portion becomes a region having higher ink affinity compared with other portions, so that only the portion where the pixel portion and the like are formed can be easily set as the ink affinity region. A color filter can be manufactured.

Further, in the color filter according to the seventh aspect, as described in the eighth aspect, energy irradiation onto the photocatalyst-containing layer is performed to reduce the fluorine content at the portion where the fluorine content is reduced. It is preferable that the fluorine content of the portion not irradiated with the energy is 100 or less, where 100 is the fluorine content.

As described above, when the fluorine content in the portion having a low fluorine content formed by irradiating the energy on the photocatalyst-containing layer is 100, the fluorine content in the portion not irradiated with the energy is 100. At 10
If it is below, it is possible to cause a great difference in ink affinity between the energy irradiated portion and the non-irradiated portion. Therefore, by forming the pixel portions and the like in the photocatalyst containing layer on which such a pattern is formed, it becomes possible to accurately form the pixel portions and the like only in the ink-philic region where the fluorine content is reduced, and with high accuracy A color filter can be manufactured.

The photocatalyst contained in the photocatalyst containing layer is
As described in claim 9, titanium oxide (Ti
O_Two), Zinc oxide (ZnO), tin oxide (SnO)_Two), J
Strontium titanate (SrTiO_Three), Oxidized tongue
Ten (WO_Three), Bismuth oxide (Bi)_TwoO_Three), And acid
Iron fossil (Fe_TwoO_Three) One or more selected from
Preferably, it is a substance. In particular, claim 10
Like titanium oxide (TiO _Two)
No. This is because the band gap energy of titanium oxide is
Highly effective as a photocatalyst and chemically stable
Because it is non-toxic and readily available.

In the case where the photocatalyst described in claim 10 is a color filter in which the photocatalyst is titanium oxide, as described in claim 11, the content of fluorine in the unirradiated portion on the surface of the photocatalyst containing layer is X When analyzed and quantified by linear photoelectron spectroscopy, it is preferable to have a photocatalyst-containing layer in which the fluorine element is contained on the surface of the photocatalyst-containing layer at a ratio of 500 or more, when the titanium element is 100. .

When the fluorine (F) element in such an amount is contained, the ink repellency of the non-irradiated portion is sufficient, and the portion of the fluorine (F) element content reduced by the energy irradiation is reduced. This is because when a pattern is formed and a pixel portion or the like is formed here, the ink or the like does not protrude to a portion other than the portion where the pixel portion is formed, and a color filter can be manufactured more accurately.

On the other hand, in the color filter according to any one of the first to eleventh aspects, the binder which is another component constituting the photocatalyst containing layer is as described in the twelfth aspect. It is preferably an organopolysiloxane having a fluoroalkyl group.

In the color filter of the present invention, various methods can be used as a method for containing a fluorine element in the photocatalyst-containing layer. However, by using an organopolysiloxane having a fluoroalkyl group as a binder, it can be easily prepared. This is because the fluorine element can be contained in the photocatalyst-containing layer, and the content can be easily reduced by irradiation with energy.

[0027] Similarly, in the color filter described in any one of the first to eleventh aspects, the binder which is another component constituting the photocatalyst containing layer is as described in the thirteenth aspect. In the formula, Y _n SiX _(4-n) (where Y represents an alkyl group, a fluoroalkyl group, a vinyl group, an amino group, a phenyl group or an epoxy group;
Represents an alkoxyl group or a halogen. n is an integer from 0 to 3. ) Is preferably an organopolysiloxane that is one or more hydrolytic condensates or cohydrolytic condensates of the silicon compound represented by the formula (1).

In the color filter according to the thirteenth aspect, as described in the fourteenth aspect, among the silicon compounds constituting the organopolysiloxane,
0.01 mol% of a silicon compound containing a fluoroalkyl group
It is preferable that the above is included.

As described above, when the silicon compound containing a fluoroalkyl group is contained in an amount of 0.01 mol% or more, the surface of the photocatalyst-containing layer contains a sufficient amount of elemental fluorine. Since the difference in wettability between the ink-philic region on the photocatalyst-containing layer in which the content of the element is reduced and the ink-repellent region on the surface of the photocatalyst-containing layer where energy has not been irradiated can be increased, the ink-philic region is This is because when forming a pixel portion or the like, ink or the like can be accurately adhered without protruding into the ink-repellent region, and a high-quality color filter can be manufactured.

In the present invention, the contact angle with a liquid having a surface tension of 40 mN / m on the photocatalyst-containing layer is 10 degrees or more in a part where energy is not irradiated, and 10 degrees in a part where energy is irradiated. It is preferably less than (claims 15 and 31).
Since the portion that is not irradiated with energy is a portion that requires ink repellency, if the contact angle with a liquid having a surface tension of 40 mN / m is less than 10 degrees, the ink repellency is not sufficient. It is not preferable because ink or the like may remain. If the contact angle with the liquid having a surface tension of 40 mN / m is 10 degrees or more, the spread of the ink or the like in this portion may be poor, and color loss in the pixel portion may occur. This is because the like may occur.

Further, in the invention described in any one of claims 1 to 15, as described in claim 16 (claim 33), the pixel portion is provided on the transparent substrate. It is preferable that the pixel portion is provided with a plurality of colors in a predetermined pattern by a printing method using an intaglio. This is because it is preferable to form the pixel portion by a printing method using an intaglio in relation to the viscosity of ink that can be used.

[0032] In the invention described in claim 16 (claim 33), as described in claim 17 (claim 34), the viscosity of the ink used for coloring in the printing system is 0.1. It is preferably in the range of 1 to 10 poise. If the viscosity is larger than the above range, even if the ink is printed in the ink-philic region forming the pixel portion, the ink cannot sufficiently spread in the ink-philic region,
This is because there is a possibility of causing a defect such as color missing or the like, and if the viscosity is smaller than the above range, the printability may be poor.

In the present invention, as described in claim 18 (claim 35), the pixel portion colored by the printing method is a pixel portion colored by a printing method using aqueous ink. Claim 19 (claim 36)
As described in above, the pixel portion may be colored by a printing method using oil-based ink. This is because whether to use oil-based ink or water-based ink is appropriately determined in consideration of printing characteristics, suitability for wettability on the photocatalyst-containing layer, and the like.

In the invention described in claim 18 (claim 35) or claim 19 (claim 36), as described in claim 20 (claim 37), coloring is performed by the printing method. It is preferable that the pixel portion is a pixel portion colored by a printing method using a UV curable ink. In the present invention, it is preferable that the pixel portion colored by the printing method is a pixel portion colored by a printing method using a UV curable ink. By using a UV-curable ink, after forming a pixel portion by coloring by a printing method, by irradiating UV, the ink can be quickly cured, and can be immediately sent to the next process. Is preferred.

A liquid crystal panel having the above-described color filter and a substrate opposed thereto and provided with a light-shielding portion, and obtained by enclosing a liquid crystal compound between the two substrates, has a structure as described above. There is an advantage of the color filter, that is, there is no color omission or color unevenness in the pixel portion, and it is advantageous in terms of cost (claim 38).

Further, according to the present invention, in order to achieve the above-mentioned object, (1) the wettability of the irradiated portion by energy irradiation on the transparent substrate decreases in the direction in which the contact angle with the liquid decreases. Providing a changing photocatalyst-containing layer; and (2) exposing the pixel portion to a pixel portion forming portion, which is a portion on the photocatalyst-containing layer provided on the transparent substrate, which is a portion for forming a pixel portion, by applying energy in a pattern. Forming a pixel portion, and (3) forming a pixel portion by coloring the exposed portion for the pixel portion by a printing method using letterpress, lithographic, stencil, or intaglio. Provide a manufacturing method.

As described above, in the method for producing a color filter of the present invention, a photocatalyst-containing layer is provided on a transparent substrate, and the photocatalyst-containing layer is irradiated with energy, so that the contact angle of the energy-irradiated portion with the liquid is reduced. A reduced exposure portion for a pixel portion can be formed. The pixel portion can be easily formed by coloring the exposed portion for the pixel portion by various printing methods. Therefore, even on a transparent substrate on which a light-shielding portion is not provided, a pixel portion can be provided at low cost by using various printing methods.

Further, according to the present invention, as described in claim 22, after forming the above-mentioned pixel portion exposure portion, the pixel portion is colored by a printing method using a relief, planographic, stencil or intaglio plate to form a pixel portion. (A) forming a first pixel portion exposure portion by pattern-irradiating energy to a part of a pixel portion formation portion, which is a portion where the pixel portion on the photocatalyst-containing layer is formed, on the photocatalyst-containing layer; b) The first pixel portion exposure portion is colored by a printing method using a relief printing plate, a lithographic printing plate, a stencil printing plate or an intaglio printing plate.
Forming a pixel portion; and (c) forming a second pixel portion exposure portion by exposing the pixel portion formation portion on the photocatalyst-containing layer, which is a portion where the remaining pixel portion is formed, to (d) The second pixel portion exposure portion may be colored by a printing method using letterpress, planographic, stencil, or intaglio to form a second pixel portion.

When the pixel portion is formed in a state where the light-shielding portion is not formed on the transparent substrate, the pixel portion cannot be used as a partition when coloring the pixel portion. Therefore,
In the case where the pixel portion is formed by coloring the exposed portion for the pixel portion, which is an ink-philic region by energy irradiation, by various printing methods,
In the case where the distance between the exposed portions for the pixel portion is small, that is, when the width of the ink-repellent region that has not been exposed is narrow, the ink of the pixel portion adjacent to and beyond the ink-repellent region is mixed at the time of forming the pixel portion. Possibilities arise. Therefore, when forming the pixel portion, it is desirable to form the pixel portion as far as possible from each other. As described above, first, the first
If the method of forming the second pixel portion after forming the pixel portion is adopted, for example, when forming the first pixel portion, it is possible to pattern-irradiate energy so that every other pixel portion is formed. Thus, adjacent pixel units can be separated from each other when the first pixel unit is formed. As described above, the first pixel portion exposure portion is formed in a state having a relatively wide ink-repellent region between the coloring regions, and the first pixel portion exposure portion is colored by various printing methods to form the ink of the adjacent pixel portion. This eliminates the possibility that the inconvenience of mixing is caused. Exposure is again performed between the first pixel portions provided in this manner to form an exposure portion for the second pixel portion, and by using a variety of printing methods to color the color portion, a color filter free from defects such as mixing of inks is formed. Can be formed. Also,
In a color filter without a light-shielding part,
In some cases, a pixel having no gap between pixel portions is required. In such a case, it is necessary to use a method in which the formation of the pixel portion described above is necessarily performed twice.

Further, in the present invention, as described in claim 23, before forming the exposure section for the pixel section,
A projection exposure section for forming the ink repellent projection may be formed, and the ink repellency projection may be formed in the exposure section for projection using a resin composition. By forming the ink-repellent convex portions in this way, for example, when the ink-repellent convex portions are formed around the region where the pixel portion is formed, the ink flows out around the color filter and the ink flows out accurately. This makes it possible to prevent such a problem that a pixel portion cannot be formed in a pixel. In the present invention, it is particularly preferable that the ink-repellent convex portion is formed between the pixel portions. By doing so, the problem described above, that is, the problem that the inks of the adjacent pixel portions are mixed, is less likely to occur.

Furthermore, in the present invention, as described in claim 25, (1) a photocatalyst-containing layer in which the wettability of an irradiated portion is changed in a direction in which the contact angle with a liquid is reduced by irradiating energy on a transparent substrate. And (2) forming a pixel portion on the transparent substrate by a printing method using a relief, planographic, stencil, or intaglio plate at the boundary of the pixel portion forming portion, where the pixel portion is formed. Forming a portion, and a method of manufacturing a color filter.

According to this method, first, the photocatalyst-containing layer is provided on the transparent substrate at the boundary of the pixel portion forming portion. When a material having a higher contact angle with a liquid than the surface of the transparent substrate before irradiation with energy is used for the photocatalyst-containing layer,
The pixel portion forming portion between the photocatalyst containing layer and the pixel portion forming portion becomes an ink-philic region having a smaller contact angle with the liquid than the boundary portion where the photocatalyst containing layer is formed, and the boundary portion with the pixel portion forming portion becomes an ink-repellent region. . Therefore, the next step, letterpress,
When the ink is applied to the pixel portion forming portion, which is the ink-philic region, by a printing method using a lithographic plate, a stencil, or an intaglio, the attached ink does not move beyond the boundary portion, which is the ink-repellent region. Therefore, in the production of the color filter, problems such as color mixing of the inks hardly occur.

Further, in this case, the wettability on the transparent substrate is set at a surface tension of 40 mN.
/ M of the liquid is preferably less than 10 degrees. In this way, by making the wettability on the transparent substrate ink-philic, the ink spreads evenly and evenly when the ink is applied on the transparent substrate by various printing methods, so that color unevenness and color omission are caused. Does not occur, and a high-quality color filter can be provided.

In the present invention, the energy for irradiating and exposing the photocatalyst-containing layer to light is usually light including ultraviolet light as described in claim 27. Claim 2 when performing
As described in 8, the photocatalytic reaction initiation energy and the reaction rate increasing energy are used as the energy,
The exposed portion may be formed by irradiating the portion irradiated with the photocatalytic reaction initiation energy with the reaction speed increasing energy.

In this method, a photocatalytic reaction initiation energy is applied to a photocatalyst-containing layer, and a reaction speed increasing energy is applied in a pattern in a region where the photocatalytic reaction initiation energy is applied to form a pattern of an exposed portion. It is. That is, since the formation of a pattern by photolithographic irradiation, which has been proposed by the inventors and the like, uses a photocatalytic reaction initiation energy such as the ultraviolet light, the apparatus is expensive, difficult to handle, and furthermore, cannot output continuously. In some cases. However, in this method, a photocatalytic reaction initiation energy such as ultraviolet rays is added, and a pattern is formed by using a reaction speed increasing energy such as infrared rays in a region where the photocatalytic reaction initiation energy is added. In forming a pattern, there is an advantage that a reaction speed increasing energy such as an infrared laser which is relatively inexpensive and easy to handle can be used.

In the present invention, when the two energies of the photocatalytic reaction initiation energy and the reaction rate increasing energy are used, as described in claim 29, the photocatalytic reaction initiation energy is light including ultraviolet light. It is preferable that the energy for increasing the reaction rate is heat energy. This is because, in the present invention, titanium dioxide is suitably used as a photocatalyst, but ultraviolet light is preferable as the photocatalytic reaction initiation energy in view of the band gap of the titanium dioxide. In addition, it is preferable that the energy for increasing the reaction rate is heat, and it is preferable that the heat energy is applied by an infrared laser. This is because the method using an infrared laser is relatively inexpensive and easy to handle.

In the present invention, as described in claim 32, in the case of coloring in the printing method, the relief printing is performed such that the width of the ink adhered by the printing method is smaller than the width of the pixel portion to be formed. , Planographic, stencil or intaglio patterns are preferably formed. The area to attach is
This is because it is better in terms of accuracy to make the area smaller than the area where the pixel portion is formed and to form so that the attached ink spreads over the ink-philic area.

[0048]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail. First, a color filter will be described, and then a method of manufacturing the color filter will be described.

A. First, the color filter of the present invention will be described in detail. The color filter of the present invention is a transparent substrate, a relief plate, a lithographic plate, a pixel portion provided with a predetermined pattern of a plurality of colors by a printing method using a stencil or intaglio on the transparent substrate, and to form the pixel portion And a photocatalyst-containing layer provided at least comprising a photocatalyst and a binder, the wettability of which is changed so that a contact angle with a liquid is reduced by energy irradiation.

The present invention is characterized in that a photocatalyst containing layer provided for forming a pixel portion as described above is provided. Therefore, the pixel portion can be easily formed by various printing methods by changing the wettability of the photocatalyst-containing layer, so that a high-quality color filter can be obtained at low cost. Here, to form a pixel portion means to position the pixel portion on a transparent substrate.

Hereinafter, the color filter of the present invention having such a photocatalyst-containing layer will be described in detail using embodiments.

1. First Embodiment The first embodiment of the present invention relates to a color filter in which the photocatalyst-containing layer is formed on the transparent substrate, and the pixel portion is provided at a predetermined position on the photocatalyst-containing layer. This is an example of a color filter formed by positioning a pixel portion with a photocatalyst-containing layer.

As described above, in the present embodiment, in the color filter having no light-shielding portion, the pixel portion is provided on the photocatalyst-containing layer capable of changing the wettability. Therefore, the wettability of the portion where the pixel portion is provided in advance is set as the ink-philic region where the contact angle with the liquid is small,
The other portion can be an ink-repellent region having a large contact angle with the liquid. By coloring the pixel portion forming portion where the pixel portion is provided by various printing methods, the ink adheres only to the ink-philic region having a small contact angle with the liquid, so that the pixel portion is formed on the transparent substrate on which the light shielding portion is not formed. However, evenly, the ink spreads evenly over the entire pixel portion, and there is no ink-free area or color unevenness in the pixel portion, and the ink does not adhere to other ink-repellent areas.

An example of such a color filter of the first embodiment will be described with reference to the drawings.

FIG. 1 shows an example of the color filter of this embodiment. The color filter 1 is formed on a photocatalyst containing layer 3 provided on a transparent substrate 2 and further on this photocatalyst containing layer 3. It is composed of three color pixel sections 4 of red (R), green (G), and blue (B). In the color filter of the present embodiment, a protective layer may be provided on the pixel portion 4 as necessary.

In the color filter of this embodiment,
It is preferable that the distance between the pixel portions 4 is small. This is because the color filter of the present invention is of a type in which a black matrix (light-shielding portion) is not formed. Therefore, in order to actually use the liquid crystal filter, the color filter is used together with the black matrix provided on the substrate on the backlight side. There is a need to. At this time, if the distance between the pixel units is large, unless the positional accuracy with the substrate on the backlight side on which the black matrix is formed is kept high, the backlight transmits between the pixel units and so-called color loss occurs. It is possible and not preferable.

Further, by reducing the distance between the pixel portions as described above, there is an advantage that the smoothness of the colored layer formed of the pixel portions can be obtained. In the present embodiment, specifically, the distance between the pixel portions is preferably 2 μm or less, particularly preferably 1 μm or less. If necessary, there is no gap between the pixel portions. Is also good.

FIG. 2 shows another example of the color filter of the present embodiment. As in the example shown in FIG. 1, the photocatalyst containing layer 3 provided on the transparent substrate 2 and the photocatalyst containing layer 3 and a pixel section 4 formed on the pixel section 3, and an ink-repellent convex section 5 having ink repellency is formed between the pixel sections 4. As described above, since the ink-repellent convex portions 5 are formed in the color filter 1 of this example, when the ink is adhered to the pixel portion forming portion by various printing methods, the ink-repellent convex portions 5 are formed. Since no ink flows out, a color filter having a pixel portion that does not mix with other color inks can be obtained.

Hereinafter, each part constituting the color filter of this embodiment will be described.

(Photocatalyst-Containing Layer) The photocatalyst-containing layer 5 is a layer whose wettability changes so that the contact angle with a liquid is reduced by irradiation of energy. As described above, the wettability is reduced so that the contact angle with the liquid is reduced by the exposure (in the present invention, not only the irradiation of light but also the irradiation of energy). By providing a changing photocatalyst containing layer, it is possible to easily change the wettability by performing energy pattern irradiation or the like, and to form a pattern of an ink-philic region having a small contact angle with a liquid, for example, a pixel portion. Only the portion where is formed can be easily made the ink-philic region. Therefore, a color filter can be manufactured efficiently, which is advantageous in cost. In this case, as the energy in this case, light including ultraviolet light is usually used.

Here, the ink-philic region is a region where the contact angle with the liquid is small and has good wettability with various printing inks. Further, the ink-repellent region is a region having a large contact angle with a liquid and a region having poor wettability with various printing inks and the like.

The photocatalyst-containing layer has a contact angle of not less than 10 degrees with a liquid having a surface tension of 40 mN / m, preferably a contact angle of not less than 10 degrees with a liquid having a surface tension of 30 mN / m in the unexposed portion. In particular, the contact angle with a liquid having a surface tension of 20 mN / m is preferably 10 degrees or more. This is because the unexposed portion is a portion that requires ink repellency in the present invention, so if the contact angle with the liquid is small, the ink repellency is not sufficient, and ink may remain. This is not preferable because the property is generated.

In the photocatalyst-containing layer, the contact angle with a liquid decreases when exposed to light, and the contact angle with a liquid having a surface tension of 40 mN / m is less than 10 degrees, preferably a surface tension of 50 mN / m.
/ M of liquid has a contact angle of 10 degrees or less, especially a surface tension of 60
It is preferable that the layer has a contact angle with the liquid of mN / m of 10 degrees or less. If the contact angle of the exposed portion with the liquid is high, the spread of the ink in this portion may be inferior, and color missing or the like may occur in the pixel portion.

Here, the contact angle with the liquid mentioned here is determined by measuring the contact angle with a liquid having various surface tensions using a contact angle measuring device (CA-Z type manufactured by Kyowa Interface Science Co., Ltd.). After dropping, measure when equilibrium is reached, and from the results,
Alternatively, the result is obtained as a graph. In this measurement, wetting index standard solutions manufactured by Junsei Chemical Co., Ltd. were used as liquids having various surface tensions.

The photocatalyst-containing layer of the present invention preferably comprises at least a photocatalyst and a binder. With such a layer, the critical surface tension can be increased by the action of a photocatalyst by light irradiation, and the contact angle with the liquid can be reduced.

The action mechanism of a photocatalyst represented by titanium oxide as described later in such a photocatalyst containing layer is as follows.
Although not always clear, carriers generated by light irradiation change the chemical structure of organic matter by direct reaction with nearby compounds or by active oxygen species generated in the presence of oxygen and water. It is believed that.

In the photocatalyst-containing layer used in the present invention, the photocatalyst changes the wettability of the exposed portion by utilizing the action of oxidation and decomposition of an organic group or an additive which is a part of the binder, thereby improving the ink affinity. Thus, a large difference in wettability with the non-exposed portion can be caused. Therefore, by improving the receptivity (ink-affinity) and repellency (ink-repellency) with various printing inks, it is possible to obtain a color filter of good quality and advantageous in cost.

When such a photocatalyst-containing layer is used in the present invention, the photocatalyst-containing layer contains at least a photocatalyst and fluorine, and the fluorine content on the surface of the photocatalyst-containing layer is more than that of the photocatalyst-containing layer. The photocatalyst-containing layer may be formed such that when the energy is irradiated, the photocatalyst-containing layer is reduced by the action of the photocatalyst as compared with before the energy irradiation.

In a color filter having such a characteristic, by irradiating a pattern with energy,
It is possible to easily form a pattern composed of a portion having a low fluorine content. Here, fluorine has an extremely low surface energy, so that the surface of a substance containing a large amount of fluorine has a smaller critical surface tension. Therefore, the critical surface tension of the portion having a low fluorine content is larger than the critical surface tension of the portion having a high fluorine content. This means that a portion having a low fluorine content is an ink-philic region compared to a portion having a high fluorine content. Therefore, forming a pattern composed of a portion having a smaller fluorine content than the surrounding surface forms a pattern of the ink-philic region within the ink-repellent region.

Therefore, when such a photocatalyst-containing layer is used, the pattern of the ink-philic region can be easily formed in the ink-repellent region by irradiating the pattern with energy. It is possible to easily form a pixel portion or the like only in the active region, and a high-quality color filter can be obtained.

As described above, the content of fluorine contained in the fluorine-containing photocatalyst containing layer is determined by the fact that the fluorine content in the ink-philic region formed by irradiation with energy and having a low fluorine content is irradiated with energy. When the fluorine content of the unexposed portion is 100, it is preferably 10 or less, more preferably 5 or less, and particularly preferably 1 or less.

By setting it within such a range, it is possible to cause a great difference in the ink affinity between the energy irradiated portion and the non-irradiated portion. Therefore, by forming a pixel portion or the like in such a photocatalyst containing layer, it becomes possible to accurately form a pixel portion or the like only in an ink-philic region having a reduced fluorine content, and to obtain a color filter with high accuracy. Because it can be. In addition, this reduction rate is based on weight.

For the measurement of the fluorine content in the photocatalyst-containing layer, various commonly used methods can be used. For example, X-ray photoelectron spectroscopy (X-ray photoelectron spectroscopy) can be used.
oelectron Spectroscopy, ESCA (Electron Spectroscop
y for Chemical Analysis). ), Any method capable of quantitatively measuring the amount of fluorine on the surface, such as X-ray fluorescence analysis and mass spectrometry.

The photocatalyst used in the present invention includes, for example, titanium oxide (TiO ₂ ), zinc oxide (ZnO), tin oxide (SnO ₂ ), strontium titanate (SrTiO ₃ ), and tungsten oxide (W) which are known as optical semiconductors.
O ₃ ), bismuth oxide (Bi ₂ O ₃ ), and iron oxide (F
e ₂ O ₃ ), and one or more of them may be used in combination.

In the present invention, titanium oxide is particularly preferably used because it has a high band gap energy, is chemically stable, has no toxicity, and is easily available. Titanium oxide includes anatase type and rutile type, and both can be used in the present invention, but anatase type titanium oxide is preferable. Anatase type titanium oxide has an excitation wavelength of 380 nm or less.

Examples of such anatase type titanium oxide include anatase type titania sol of peptized hydrochloric acid (STS-02 (average particle size: 7 nm) manufactured by Ishihara Sangyo Co., Ltd.)
ST-K01 manufactured by Ishihara Sangyo Co., Ltd., anatase titania sol of nitric acid peptization type (TA-15 (average particle size: 12 nm) manufactured by Nissan Chemical Industries, Ltd.) and the like can be mentioned.

The smaller the particle size of the photocatalyst is, the more effective the photocatalytic reaction takes place. It is preferable that the average particle size is 50 nm or less, and it is particularly preferable to use a photocatalyst having a mean particle size of 20 nm or less. In addition, the smaller the particle size of the photocatalyst is, the smaller the surface roughness of the formed photocatalyst-containing layer is. It is preferable that the particle size of the photocatalyst exceeds 100 nm. It is not preferable because the ink repellency of the non-exposed portion of the containing layer is reduced, and the expression of ink affinity in the exposed portion is insufficient.

As described above, the color filter of the present invention contains fluorine on the surface of the photocatalyst-containing layer, and the surface of the photocatalyst-containing layer is irradiated with energy in a pattern to reduce the fluorine content on the surface of the photocatalyst-containing layer. Thus, a color filter obtained by forming a pattern of an ink-philic region in the ink-repellent region and forming a pixel portion or the like on the pattern may be used. Even in this case, it is preferable to use titanium dioxide as described above as a photocatalyst,
When the content of fluorine contained in the photocatalyst containing layer when titanium dioxide is used is analyzed and quantified by X-ray photoelectron spectroscopy, the titanium (Ti) element is 10%.
When it is set to 0, it is preferable that the fluorine (F) element is contained on the surface of the photocatalyst containing layer at a ratio of 500 or more, preferably 800 or more, particularly preferably 1200 or more.

When fluorine (F) is contained in the photocatalyst-containing layer to this extent, the critical surface tension on the photocatalyst-containing layer can be sufficiently reduced, so that the ink repellency on the surface can be ensured. Pattern, the fluorine content can be reduced, so that the difference in wettability with the ink-philic region on the surface in the pattern portion can be increased, and the quality of the finally obtained color filter can be improved. It is.

Further, in such a color filter, the fluorine content in the ink-affinity region formed by pattern irradiation of energy is such that the fluorine (F) element is 50 or less when the titanium (Ti) element is 100. , Preferably 20 or less, particularly preferably 10 or less.

If the content of fluorine in the photocatalyst-containing layer can be reduced to this extent, sufficient ink-affinity for forming a pixel portion or the like can be obtained, and the above-mentioned portion of the energy-unirradiated portion can be obtained. Due to the difference in wettability from ink repellency, a pixel portion and the like can be formed with high accuracy, and a color filter with good quality can be obtained.

In the present invention, the binder used in the photocatalyst-containing layer preferably has a high binding energy such that the main skeleton is not decomposed by the photoexcitation of the photocatalyst. For example, (1) chloro or alkoxy by a sol-gel reaction or the like is used. Examples thereof include organopolysiloxanes that exhibit great strength by hydrolyzing and polycondensing silanes and the like, and (2) organopolysiloxanes obtained by crosslinking reactive silicones having excellent water repellency and oil repellency.

In the case of the above (1), the general formula: Y _n SiX _(4-n) (where Y represents an alkyl group, a fluoroalkyl group, a vinyl group, an amino group, a phenyl group or an epoxy group,
X represents an alkoxyl group, an acetyl group or a halogen. n is an integer from 0 to 3. ) Is preferably an organopolysiloxane that is one or more hydrolytic condensates or cohydrolytic condensates of the silicon compound represented by the formula (1). Here, the carbon number of the group represented by Y is preferably in the range of 1 to 20, and the alkoxy group represented by X is preferably a methoxy group, an ethoxy group, a propoxy group, or a butoxy group. preferable.

Specifically, methyltrichlorosilane, methyltribromosilane, methyltrimethoxysilane, methyltriethoxysilane, methyltriisopropoxysilane, methyltri-t-butoxysilane; ethyltrichlorosilane, ethyltribromosilane, ethyltrichlorosilane Methoxysilane, ethyltriethoxysilane, ethyltriisopropoxysilane, ethyltri-t-butoxysilane; n
-Propyltrichlorosilane, n-propyltribromosilane, n-propyltrimethoxysilane, n-propyltriethoxysilane, n-propyltriisopropoxysilane, n-propyltri-t-butoxysilane; n-
Hexyltrichlorosilane, n-hexyltribromosilane, n-hexyltrimethoxysilane, n-hexyltriethoxysilane, n-hexyltriisopropoxysilane, n-hexyltri-t-butoxysilane; n-decyltrichlorosilane, n-decyltribromosilane,
n-decyltrimethoxysilane, n-decyltriethoxysilane, n-decyltriisopropoxysilane, n-
Decyltri-t-butoxysilane; n-octadecyltrichlorosilane, n-octadecyltribromosilane, n
-Octadecyltrimethoxysilane, n-octadecyltriethoxysilane, n-octadecyltriisopropoxysilane, n-octadecyltri-t-butoxysilane; phenyltrichlorosilane, phenyltribromosilane, phenyltrimethoxysilane, phenyltriethoxysilane, phenyl Triisopropoxysilane, phenyltri-t-butoxysilane; tetrachlorosilane, tetrabromosilane, tetramethoxysilane, tetraethoxysilane, tetrabutoxysilane, dimethoxydiethoxysilane; dimethyldichlorosilane, dimethyldibromosilane, dimethyldimethoxysilane , Dimethyldiethoxysilane; diphenyldichlorosilane, diphenyldibromosilane, diphenyldimethoxysilane, diphenyldiethoxysilane Phenyl methyldichlorosilane,
Phenylmethyldibromosilane, phenylmethyldimethoxysilane, phenylmethyldiethoxysilane; trichlorohydrosilane, tribromohydrosilane, trimethoxyhydrosilane, triethoxyhydrosilane, triisopropoxyhydrosilane, tri-t-butoxyhydrosilane; vinyltrichlorosilane, vinyltribromo Silane, vinyltrimethoxysilane, vinyltriethoxysilane, vinyltriisopropoxysilane, vinyltrit
-Butoxysilane; trifluoropropyltrichlorosilane, trifluoropropyltribromosilane, trifluoropropyltrimethoxysilane, trifluoropropyltriethoxysilane, trifluoropropyltriisopropoxysilane, trifluoropropyltri-t-butoxysilane; γ- Glycidoxypropylmethyldimethoxysilane, γ-glycidoxypropylmethyldiethoxysilane, γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropyltriethoxysilane, γ
Glycidoxypropyltriisopropoxysilane, γ
-Glycidoxypropyltri-t-butoxysilane; γ-
Methacryloxypropylmethyldimethoxysilane, γ
-Methacryloxypropylmethyldiethoxysilane,
γ-methacryloxypropyltrimethoxysilane, γ
-Methacryloxypropyltriethoxysilane, γ-
Methacryloxypropyltriisopropoxysilane,
γ-methacryloxypropyltri-t-butoxysilane; γ-aminopropylmethyldimethoxysilane, γ-
Aminopropylmethyldiethoxysilane, γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, γ-aminopropyltriisopropoxysilane, γ-aminopropyltri-t-butoxysilane;
γ-mercaptopropylmethyldimethoxysilane, γ-
Mercaptopropylmethyldiethoxysilane, γ-mercaptopropyltrimethoxysilane, γ-mercaptopropyltriethoxysilane, γ-mercaptopropyltriisopropoxysilane, γ-mercaptopropyltri-t-butoxysilane; β- (3,4-epoxy Cyclohexyl) ethyltrimethoxysilane, β- (3,4-epoxycyclohexyl) ethyltriethoxysilane; and their partial hydrolysates; and mixtures thereof, can be used.

As the binder, a polysiloxane containing a fluoroalkyl group can be particularly preferably used. Specifically, one or more hydrocondensation products of the following fluoroalkylsilanes, co-hydrolysis Examples thereof include condensates, and those generally known as a fluorine-based silane coupling agent can be used.

CF ₃ (CF ₂ ) ₃ CH ₂ CH ₂ Si (OC
H ₃ ) ₃ ; CF ₃ (CF ₂ ) ₅ CH ₂ CH ₂ Si (OC
H ₃ ) ₃ ; CF ₃ (CF ₂ ) ₇ CH ₂ CH ₂ Si (OC
H ₃ ) ₃ ; CF ₃ (CF ₂ ) ₉ CH ₂ CH ₂ Si (OC
_{H 3) 3; (CF 3} ) 2 CF (CF 2) 4 CH 2 CH 2 Si (O
CH ₃ ) ₃ ; (CF ₃ ) ₂ CF (CF ₂ ) ₆ CH ₂ CH ₂ Si
(OCH ₃ ) ₃ ; (CF ₃ ) ₂ CF (CF ₂ ) ₈ CH ₂ CH ₂ S
i (OCH ₃ ) ₃ ; CF ₃ (C ₆ H ₄ ) C ₂ H ₄ Si (OC
_{H 3) 3; CF 3 (} CF 2) 3 (C 6 H 4) C 2 H 4 Si (OC
H ₃ ) ₃ ; CF ₃ (CF ₂ ) ₅ (C ₆ H ₄ ) C ₂ H ₄ Si (OC
_{H 3) 3; CF 3 (} CF 2) 7 (C 6 H 4) C 2 H 4 Si (OC
H ₃ ) ₃ ; CF ₃ (CF ₂ ) ₃ CH ₂ CH ₂ SiCH ₃ (OCH
₃ ) ₂ ; CF ₃ (CF ₂ ) ₅ CH ₂ CH ₂ SiCH ₃ (OC
H ₃ ) ₂ ; CF ₃ (CF ₂ ) ₇ CH ₂ CH ₂ SiCH ₃ (OCH
₃ ) ₂ ; CF ₃ (CF ₂ ) ₉ CH ₂ CH ₂ SiCH ₃ (OC
H ₃ ) ₂ ; (CF ₃ ) ₂ CF (CF ₂ ) ₄ CH ₂ CH ₂ SiCH
₃ (OCH ₃ ) ₂ ; (CF ₃ ) ₂ CF (CF ₂ ) ₆ CH ₂ CH ₂
SiCH ₃ (OCH ₃ ) ₂ ; (CF ₃ ) ₂ CF (CF ₂ ) ₈ C
H ₂ CH ₂ SiCH ₃ (OCH ₃ ) ₂ ; CF ₃ (C ₆ H ₄ ) C ₂
H ₄ SiCH ₃ (OCH ₃ ) ₂ ; CF ₃ (CF ₂ ) ₃ (C
₆ H ₄ ) C ₂ H ₄ SiCH ₃ (OCH ₃ ) ₂ ; CF ₃ (CF ₂ ) ₅
(C ₆ H ₄ ) C ₂ H ₄ SiCH ₃ (OCH ₃ ) ₂ ; CF ₃ (CF
_{2) 7 (C 6 H 4} ) C 2 H 4 SiCH 3 (OCH 3) 2; CF
₃ (CF ₂ ) ₃ CH ₂ CH ₂ Si (OCH ₂ CH ₃ ) ₃ ; CF ₃
(CF ₂ ) ₅ CH ₂ CH ₂ Si (OCH ₂ CH ₃ ) ₃ ; CF
₃ (CF ₂ ) ₇ CH ₂ CH ₂ Si (OCH ₂ CH ₃ ) ₃ ; CF _{3
(CF 2) 9 CH 2 CH} 2 Si (OCH 2 CH 3) 3; and _{CF 3 (CF 2) 7 SO} 2 N (C 2 H 5) C 2 H 4 CH 2 Si
(OCH ₃ ) ₃

By using a polysiloxane having a fluoroalkyl group as described above as a binder,
The ink repellency of the non-exposed part of the photocatalyst containing layer is greatly improved,
It exhibits a function of preventing the adhesion of inks for various printing methods.

The reactive silicone of the above (2) includes compounds having a skeleton represented by the following general formula.

[0089]

Embedded image

Here, n is an integer of 2 or more, and R ¹ ,
R ² is a substituted or unsubstituted alkyl, alkenyl, aryl or cyanoalkyl group having 1 to 10 carbon atoms, and 40% or less of the whole is vinyl, phenyl or halogenated phenyl in a molar ratio. Further, those in which R ¹ and R ² are methyl groups are preferred because the surface energy is minimized, and the molar ratio of the methyl groups is preferably 60% or more. Further, the chain terminal or the side chain has at least one or more reactive group such as a hydroxyl group in the molecular chain.

In addition, a stable organosilicon compound which does not undergo a cross-linking reaction such as dimethylpolysiloxane may be mixed with the above-mentioned organopolysiloxane in a binder.

In the color filter of the present invention, various binders such as organopolysiloxane can be used for the photocatalyst-containing layer. In the present invention,
As described above, fluorine is contained in the photocatalyst containing layer containing such a binder and a photocatalyst, and fluorine is reduced on the surface of the photocatalyst containing layer by irradiating energy with a pattern. A region may be formed. At this time, it is necessary to contain fluorine in the photocatalyst containing layer, but as a method of containing fluorine in the photocatalyst containing layer containing such a binder, for a binder having usually a high binding energy,
Examples thereof include a method of bonding a fluorine compound with a relatively weak binding energy, and a method of mixing a fluorine compound bonded with a relatively weak binding energy into a photocatalyst-containing layer. By introducing fluorine by such a method, when energy is irradiated, first, a fluorine bonding site having a relatively small binding energy is decomposed, and thereby fluorine can be removed from the photocatalyst containing layer. is there.

The first method, that is, a method of binding a fluorine compound to a binder having a high binding energy with a relatively weak binding energy, is a method of introducing a fluoroalkyl group as a substituent into the organopolysiloxane. And the like.

For example, as a method for obtaining an organopolysiloxane, as described in (1) above, chloro or alkoxysilane is hydrolyzed or polycondensed by a sol-gel reaction or the like to obtain an organopolysiloxane exhibiting a large strength. be able to. Here, in this method, the general formula as described _{above: Y n SiX (4-n} ) ( wherein, Y represents an alkyl group, fluoroalkyl group, vinyl group, amino group, phenyl group or epoxy group ,
X represents an alkoxyl group, an acetyl group or a halogen. n is an integer from 0 to 3. ) Is obtained by subjecting one or more silicon compounds represented by the formula (1) to hydrolysis-condensation or co-hydrolysis condensation to obtain an organopolysiloxane. In this general formula, the organopolysiloxane has a fluoroalkyl group as a substituent Y. By synthesizing using a silicon compound, an organopolysiloxane having a fluoroalkyl group as a substituent can be obtained. When an organopolysiloxane having such a fluoroalkyl group as a substituent is used as a binder, a portion of carbon bonds of the fluoroalkyl group is decomposed by the action of the photocatalyst in the photocatalyst containing layer when energy is irradiated. Therefore, it is possible to reduce the fluorine content in the portion where the surface of the photocatalyst-containing layer is irradiated with energy.

The silicon compound having a fluoroalkyl group used at this time is not particularly limited as long as it has a fluoroalkyl group. However, the silicon compound having at least one fluoroalkyl group and Has a carbon number of 4 to 30, preferably 6 to 20,
Particularly preferably, a silicon compound having 6 to 16 is suitably used. Specific examples of such a silicon compound are as described above, and among them, the silicon compound having a fluoroalkyl group having 6 to 8 carbon atoms, that is, fluoroalkylsilane is preferable.

In the present invention, such a silicon compound having a fluoroalkyl group is mixed with the above-mentioned silicon compound having no fluoroalkyl group, and a co-hydrolyzed condensate thereof is used as the organopolysiloxane. Alternatively, one or more silicon compounds having such a fluoroalkyl group may be used, and a hydrolyzed condensate or co-hydrolyzed condensate thereof may be used as the organopolysiloxane.

In the organopolysiloxane having a fluoroalkyl group thus obtained, the silicon compound having the fluoroalkyl group is present in an amount of 0.01 mol% or more, preferably, of the silicon compounds constituting the organopolysiloxane. Preferably, it is contained in an amount of 0.1 mol% or more.

When the fluoroalkyl group is contained to this extent, the ink repellency on the photocatalyst-containing layer can be increased, and the difference in wettability from the portion that has been made ink-philic by irradiation of energy can be increased. Because you can do it.

In the method shown in the above (2), an organopolysiloxane is obtained by crosslinking a reactive silicone having excellent water repellency and oil repellency. By making one or both of R ¹ and R ^{2 in} the compound a fluorine-containing substituent such as a fluoroalkyl group, fluorine can be contained in the photocatalyst-containing layer, and energy irradiation is performed. In this case, the portion of the fluoroalkyl group having a lower binding energy than the siloxane bond is decomposed, so that the content of fluorine on the surface of the photocatalyst-containing layer can be reduced by energy irradiation.

On the other hand, in the latter case, that is, as a method of introducing a fluorine compound bonded with energy lower than the binding energy of the binder, for example, when introducing a low molecular weight fluorine compound, for example, a fluorine-based surfactant is used. And a method of introducing a fluorine compound having a high molecular weight, such as a method of mixing a fluorine resin having high compatibility with the binder resin.

In the present invention, the photocatalyst-containing layer may contain a surfactant in addition to the above-mentioned photocatalyst and binder. More specifically, NIKK manufactured by Nikko Chemicals Co., Ltd.
Hydrocarbons such as OLBL, BC, BO, and BB series, ZONYL FSN and FSO manufactured by DuPont, Surflon S-141 and 145 manufactured by Asahi Glass Co., Ltd., and Megafax F-141 manufactured by Dainippon Ink and Chemicals, Inc. 144, Neos Co., Ltd. manufactured by Fategent F-200, F251, Daikin Industries, Ltd. Unidyne DS-401, 402,
Examples include fluorine-based or silicone-based nonionic surfactants such as Florad FC-170 and 176 manufactured by 3M Co., Ltd., and a cationic surfactant, an anionic surfactant, and an amphoteric surfactant are used. You can also.

Further, in addition to the above-mentioned surfactants, the photocatalyst-containing layer contains polyvinyl alcohol, unsaturated polyester, acrylic resin, polyethylene, diallyl phthalate, ethylene propylene diene monomer, epoxy resin, phenol resin, polyurethane, melamine resin. , Polycarbonate, polyvinyl chloride, polyamide, polyimide, styrene butadiene rubber, chloroprene rubber, polypropylene, polybutylene, polystyrene, polyvinyl acetate, polyester, polybutadiene, polybenzimidazole, polyacrylonitrile, oligomers such as epichlorohydrin, polysulfide, polyisoprene, A polymer or the like can be contained.

The content of the photocatalyst in the photocatalyst containing layer is 5 to 5.
It can be set in the range of 60% by weight, preferably 20 to 40% by weight. Further, the thickness of the photocatalyst-containing layer is 0.1 mm.
It is preferably in the range of 05 to 10 μm, particularly preferably,
It is 0.1 to 0.2 μm.

The photocatalyst-containing layer can be formed by dispersing a photocatalyst and a binder, if necessary, in a solvent together with other additives to prepare a coating solution, and applying the coating solution. As the solvent to be used, alcohol-based organic solvents such as ethanol and isopropanol are preferable. The coating can be performed by a known coating method such as spin coating, spray coating, dip coating, roll coating, and bead coating. When an ultraviolet-curable component is contained as a binder, the photocatalyst-containing layer can be formed by irradiating ultraviolet rays and performing a curing treatment.

(Pixel Section) In the first embodiment,
As shown in FIGS. 1 and 2, the pixel portion 6 is provided on the photocatalyst containing layer 5. In the first embodiment, the photocatalyst-containing layer is exposed to light, and a pixel portion is formed in a predetermined pattern using a plurality of colors of ink in various ink-philic regions in which the contact angle with the liquid is low. . Normally, the pixel part is
It is formed of three colors of red (R), green (G), and blue (B). The coloring pattern and the coloring area in this pixel portion can be set arbitrarily.

The first embodiment is characterized in that the pixel section 4 is provided on the photocatalyst containing layer 3 as shown in FIGS. 1 and 2. In this embodiment, a pixel portion is formed in a predetermined pattern using a plurality of colors of ink by various printing methods in the ink-philic region exposed to light in the photocatalyst-containing layer and having a low contact angle with a liquid.
The normal pixel portion is formed with three colors of red (R), green (G), and blue (B). Coloring pattern in this pixel portion,
The coloring area can be set arbitrarily. In the color filter of the present invention, no light-shielding portion (black matrix) exists between the pixel portions. Therefore, it is considered that there is a case where a gap exists between the pixel portions and a case where the pixel portions are continuously provided. In the present embodiment, any type may be used. Further, as shown in FIG. 2, an ink repellent convex portion may be provided.

[0107] Inks of various printing methods for forming such a pixel portion are largely classified into aqueous and oily inks.
In the present invention, any ink can be used. Further, for each drying mechanism, an ink of an oxidation polymerization type, an evaporation drying type, a heat polymerization type, a light / radiation polymerization, or the like can be used.

In the present invention, it is particularly preferable to use UV curable ink. By using a UV curable ink, after forming a pixel portion by coloring by various printing methods, by irradiating UV, the ink can be quickly cured and can be immediately sent to the next step.
Therefore, a color filter can be efficiently manufactured.

Such a UV-curable ink contains a prepolymer, a monomer, a photoinitiator and a colorant as main components. As the prepolymer, polyester acrylate, polyurethane acrylate, epoxy acrylate, polyether acrylate, oligoacrylate, alkyd acrylate, polyol acrylate,
Any of prepolymers such as silicon acrylate can be used without any particular limitation.

Examples of the monomer include vinyl monomers such as styrene and vinyl acetate; monofunctional acrylic monomers such as n-hexyl acrylate and phenoxyethyl acrylate; diethylene glycol diacrylate, 1,6-hexanediol diacrylate, hydroxypiperate ester neopentyl Polyfunctional acrylic monomers such as glycol diacrylate, trimethylolpropane triacrylate, and dipentaerythrol hexaacrylate can be used. The above prepolymer and monomer may be used alone or in combination of two or more.

The photopolymerization initiators include isobutyl benzoin ether, isopropyl benzoin ether, benzoin ethyl ether, benzoin methyl ether, 1-phenyl-1,2-propadione-2-oxime, 2,2-
Dimethoxy-2-phenylacetophenone, benzyl,
Hydroxycyclohexylphenyl ketone, diethoxyacetophenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, benzophenone, chlorothioxanthone, 2-chlorothioxanthone, isopropylthioxanthone, 2-methylthioxanthone, chlorine-substituted benzophenone, halogen-substituted Those which can obtain desired curing characteristics and recording characteristics can be selected and used from alkyl-allyl ketones and the like. In addition, if necessary, a photoinitiating auxiliary such as an aliphatic amine or an aromatic amine; a photosensitizer such as thioxanthone may be added.

In the present invention, a printing method using an intaglio is preferably used in consideration of the viscosity of the ink used. This is for the following reason. That is,
In the printing method using the intaglio, the viscosity of the ink used is lower than that in the printing method using other letterpress, lithographic or stencil printing. The color filter of the present invention is a high-quality color filter without color loss by uniformly extending and spreading the ink in the ink-philic region, and therefore it is preferable that the viscosity of the ink is somewhat low. Therefore, in the present invention, a printing method using an intaglio is preferable.

In the present invention, the viscosity of the ink used in the printing method using such an intaglio is in the range of 0.1 to 10 poise, particularly in the range of 0.1 to 5 poise, and especially 0.1 to 10 poise. It is preferable to use an ink within the range of 1 poise. If the viscosity of the ink is larger than the above range,
When ink is attached to the ink-philic region by a printing method, it is not preferable because the ink hardly spreads and spreads in the ink-philic region and a problem such as color omission may occur. On the other hand, when the viscosity is lower than the above range, there is a possibility that a problem occurs in printability and the like, which is not preferable.

(Transparent Substrate) In the first embodiment of the present invention, a photocatalyst containing layer 3 is provided on a transparent substrate 2 as shown in FIGS.

The transparent substrate is not particularly limited as long as it has been conventionally used for a color filter. For example, a flexible substrate such as quartz glass, Pyrex (registered trademark) glass, or a synthetic quartz plate is used. A transparent rigid material having no flexibility, or a transparent flexible material having flexibility such as a transparent resin film or an optical resin plate can be used. Of these, Corning 7059 glass is a material having a low coefficient of thermal expansion, excellent dimensional stability and workability in high-temperature heat treatment, and is an alkali-free glass containing no alkali component in the glass. It is suitable for a color filter for a color liquid crystal display device according to the method. In the present invention, a transparent substrate is usually used as a transparent substrate, but a reflective substrate or a substrate colored white can also be used. Further, as the transparent substrate, a substrate which has been subjected to surface treatment for preventing alkali elution, imparting a gas barrier property or other purposes as necessary may be used.

(Ink-Repellent Convex Portions) In the first embodiment of the present invention, as shown in FIG. The composition of such an ink-repellent convex portion is a resin composition having an ink-repellent property.
There is no particular limitation. It is not necessary to be particularly transparent, and it may be colored. For example, a resin material that is used for a black matrix (light shielding portion) and does not contain a black material can be used. Specifically, a composition in which one or more aqueous resins such as polyacrylamide, polyvinyl alcohol, gelatin, casein, and cellulose are mixed, or an O / W emulsion-type resin composition such as a reactive silicone And the like. In the present invention, a photocurable resin is preferably used for reasons such as easy handling and easy curing. Further, since the ink repellent projections are preferably as strong as the ink repellency, the surface thereof may be treated with an ink repellent such as a silicone compound or a fluorine-containing compound.

The height of the ink-repellent convex portions in the first embodiment is somewhat high because it is provided for preventing color mixing of ink when coloring by various printing methods as described above. However, in consideration of the overall flatness when a color filter is used, the thickness is preferably close to the thickness of the pixel portion. More specifically, although it differs depending on the amount of ink to be sprayed, it is usually 0.
It is preferable that the thickness be in the range of 1 to 2 μm.

(Protective Layer) Although not shown in FIGS. 1 and 2, a protective layer may be formed on the surface of the color filter 1 if necessary. This protective layer is provided to flatten the color filter and prevent the components contained in the pixel portion or the pixel portion and the photocatalyst containing layer from being eluted into the liquid crystal layer.

The thickness of the protective layer can be set in consideration of the light transmittance of the material used, the surface condition of the color filter, and the like. For example, the thickness can be set in the range of 0.1 to 2.0 μm. it can. The protective layer can be formed using, for example, a known transparent photosensitive resin, a two-component curable transparent resin, or the like having a light transmittance required for the transparent protective layer.

(Viscoelastic Layer) In this embodiment, a viscoelastic layer may be formed between the photocatalyst-containing layer and the transparent substrate. By forming the viscoelastic layer in this manner, when forming the pixel portion by the printing method, the transfer accuracy is improved, and the quality of the obtained color filter can be improved.

The material for forming the viscoelastic layer used in this embodiment preferably has a loss tangent tan δ in the range of 0.01 to 0.2. When the loss tangent tan δ is smaller than the above range, the elastic component increases, so that the restoring force immediately after the viscoelastic layer separates from the intaglio etc. is large, and the shape and dimensional stability of the printed pattern are good, but the viscoelasticity is good. Since the followability of the layer to the intaglio plate or the like is reduced, a non-contact portion with the ink is generated, which is not preferable because a hollow defect in which the ink does not normally adhere tends to occur. On the other hand, loss tangent tanδ
Is larger than the above range, the viscous component increases, contrary to the case where the loss tangent tan δ is small, in contrast to the case where the viscoelastic layer has a small restoring force immediately after leaving the intaglio etc. It is not preferable because the shape and dimensional stability of the print pattern are reduced.

The complex elastic modulus of the viscoelastic layer is 10
It is preferably ⁶ to 10 ⁷ dyne / cm ² . If the complex elastic modulus is smaller than the above range, the acceptability of ink from an intaglio plate or the like is reduced, and printing failure is likely to occur. On the other hand, when the complex elastic modulus is larger than the above range, the ink receiving speed is increased, but the followability of the ink to the intaglio and the like is reduced, and the hollow defect is likely to occur.

The material for forming such a viscoelastic layer is not particularly limited as long as it is a material having the above-mentioned physical properties, but it is a composition containing an acrylic copolymer or a silicone copolymer. Is preferred.

Examples of the acrylic copolymer which can be used for the viscoelastic layer include stearyl (meth) acrylate,
Examples thereof include n-butyl (meth) acrylate, lauryl (meth) acrylate, 2-ethylhexyl (meth) acrylate, and 2-hydroxyethyl (meth) acrylate. In addition, (meth) acrylate means one containing at least one of acrylate and methacrylate. The molecular weight of these acrylic copolymers is 100,000 to 800,0 in weight average molecular weight.
It is preferably within the range of 00.

On the other hand, the silicone copolymer which can be used for the viscoelastic layer is dimethylpolysiloxane and at least one selected from butyl acrylate, 2-ethylhexyl acrylate, butyl methacrylate, 2-isocyanatoethyl and methacrylate. One type of copolymer, dimethylpolysiloxane, methylphenylpolysiloxane, or methylfluoropolysiloxane can be used. The molecular weight of these silicone copolymers is 100,00 in terms of weight average molecular weight.
It is preferable that it is in the range of 0 to 1,000,000.

This viscoelastic layer is particularly suitable when the printing method is a printing method using an intaglio. Further, in this embodiment, the pixel portion is formed between the photocatalyst containing layer and the transparent substrate. However, in the embodiment described later, when the pixel portion is formed directly on the transparent substrate, the viscoelastic A layer may be formed, and a pixel portion may be formed thereon by various printing methods.

[0127] 2. Second Embodiment The second embodiment of the present invention is a color filter in which a pixel portion is formed on a transparent substrate, and a photocatalyst containing layer is provided at a boundary portion of the pixel portion. This is another example of a color filter formed by positioning a pixel portion.

FIG. 3 shows an example of the second embodiment. The color filter 1 has a transparent substrate 2, a pixel portion 4 provided on the transparent substrate 2, and a photocatalyst containing layer 3 provided between the pixel portions 4, and if necessary. A protection layer (not shown) may be formed on the pixel portion 4 and the photocatalyst containing layer 3.

The feature of this embodiment is that the photocatalyst containing layer 3 is formed only at the boundary between the pixel portions 4 formed on the transparent substrate 2, and the pixel portions 4 are formed directly on the transparent plate 2. There is in the point. Thus, in the second embodiment,
Since the photocatalyst containing layer 3 is formed only at the boundary portion of the pixel portion 4, when stimulus is applied to the photocatalyst containing layer 3 to change wettability, the stimulus may be applied over the entire surface.
There is no need to stimulate in a pattern. Therefore,
This has the effect that the steps after the formation of the photocatalyst containing layer can be simplified.

In this embodiment, since the pixel portion 4 is formed directly on the transparent substrate 2 as described above, the transparent substrate 2 is preferably ink-philic. In particular, in the case where the photocatalyst containing layer 3 is formed in a pattern and then the pixel portion 4 is formed in the pixel portion forming portion therebetween, the photocatalyst containing layer 3 which is an ink-repellent region before the wettability changes is transparent. It is preferable that the pixel portion 4 is formed on the substrate 2 as an ink-philic region. Therefore, in the second embodiment, the wettability on the transparent substrate 2 is 40 mN / m in surface tension.
Is preferably less than 10 degrees, more preferably 5 degrees or less, particularly preferably 1 degree or less.

As described above, the transparent substrate whose surface is the ink-philic region is formed of a material having ink-philicity.
The surface of the material may be surface-treated so as to be ink-philic, or a material in which an ink-philic layer is formed on a transparent substrate. However, the present embodiment is not particularly limited.

An example of the surface treatment of the material to be ink-philic is an ink-philic surface treatment by plasma treatment using argon, water, or the like. Examples thereof include a silica film formed by a sol-gel method of tetraethoxysilane.

In this case, the viscoelastic layer may be formed on a transparent substrate. In this case, the wettability of the surface of the viscoelastic layer may be similar to the wettability of the transparent substrate. preferable.

The materials other than the transparent substrate 2 used in this embodiment, that is, the materials such as the photocatalyst containing layer 3, the pixel portion 4, the protective layer, and the viscoelastic layer are the same as those of the first embodiment. The description is omitted here because it is the same.

B. Next, a method of manufacturing a color filter will be described with reference to the following embodiments.

[0136] 1. Third Embodiment The third embodiment of the present invention is a manufacturing method for manufacturing the color filter according to the first embodiment of the present invention. (1) Wetting of an irradiated portion on a transparent substrate by energy irradiation Providing a photocatalyst-containing layer whose properties change in a direction in which the contact angle with the liquid decreases; and (2) a pixel-portion-forming portion that is a portion for forming a pixel portion on the photocatalyst-containing layer provided on the transparent substrate. Forming an exposed portion for a pixel portion by pattern irradiation with energy, and (3) forming a pixel portion by coloring the exposed portion for a pixel portion by a printing method using a relief printing plate, a planographic printing plate, a stencil printing plate or an intaglio printing plate. And a process.

(Explanation of Each Step) FIG. 4 is for explaining the third embodiment of the present invention. In this example, as shown in FIG. 4A, first, the photocatalyst containing layer 6 is formed on the transparent substrate 2. This photocatalyst containing layer 6 is formed by dispersing a photocatalyst and a binder as described above in a solvent together with other additives as necessary to prepare a coating solution,
After the application of the coating solution, the photocatalyst is firmly fixed in a binder by advancing hydrolysis and polycondensation reactions, thereby forming a coating. The solvent used is preferably an alcoholic organic solvent such as ethanol or isopropyl alcohol, and the coating can be performed by a known coating method such as spin coating, spray coating, dip coating, roll coating, or bead coating.

Next, a pattern is irradiated with energy using a photomask 7 to the pixel portion forming portion on the photocatalyst containing layer 6.
The exposure unit 8 for the pixel unit is formed. This exposure unit 8 for the pixel unit
Is a portion of the photocatalyst containing layer 6 where the contact angle with the liquid is reduced by the action of the photocatalyst, and forms an ink-philic region (FIG. 4B).

Using the printing device, for example, an intaglio 9 or the like, the exposure portion 8 for the pixel portion, which has become the ink-philic region by the energy irradiation, is formed in the exposure portion 8 for the pixel portion thus formed.
The ink 10 is adhered to the inside and colored red, green, and blue, respectively (FIG. 4C). In this case, since the inside of the exposure unit 8 for the pixel portion is an ink-philic region having a small contact angle with the liquid due to the irradiation of energy as described above, the ink 10 attached by the intaglio 9 is exposed to the light for the pixel portion. It spreads uniformly in the part 8. In addition, since the region of the photocatalyst-containing layer that has not been exposed is an ink-repellent region, the ink is repelled and removed in this region.

The printing apparatus used in the present invention is not particularly limited.
The printing method may be stencil printing or intaglio printing, or the printing method may be direct printing or offset, and the pressing method may be flat pressure, circular pressure, or rotary printing.

However, as described in the section of the color filter, it is preferable that the viscosity of the ink used is somewhat low in order to obtain the advantages of the present invention. Therefore, a printing method using an intaglio using a relatively low ink is preferred. Is preferred.

The viscosity of the ink used in the printing method using the intaglio is in the range of 0.1 to 10 poise, particularly in the range of 0.1 to 5 poise, and especially 0.1 to 1 poise. It is preferably within the range of poise.

Further, as described above, the ink 1
When 0 is attached, it is preferable that the width of the ink 10 is smaller than the width of the pixel unit 4, that is, the width of the pixel unit exposure unit 8. By reducing the width of the ink adhered in this way, the adhered ink can be gradually spread in the pixel portion exposure unit 8 to form a uniform pixel portion, and by reducing the width, printing can be performed. This is because it is possible to allow a margin for the positioning accuracy.

Thus, the pixel portion 4 is formed by solidifying the ink adhered in the pixel portion exposure portion 8 (FIG. 4D). In the present invention, the solidification of the ink is performed by various methods depending on the type of the ink used. For example, in the case of a water-soluble ink, the water is removed by heating or the like to be solidified.

In consideration of the ink solidification step, it is preferable that the ink used in the present invention is a UV curable ink. This is because the UV curable ink can quickly solidify the ink by irradiating the UV, so that the manufacturing time of the color filter can be shortened.

In this embodiment, a step of forming the viscoelastic layer described in the section of the color filter on the transparent substrate may be further provided.

As described above, since the ink in the pixel portion exposure section 8 spreads uniformly, when the pixel portion 4 is formed by solidifying such ink, a color filter without color loss or color unevenness is obtained. Can be formed.

(Another Example of Pixel Part Forming Method) In the above example, the pixel part 4 may be formed by one-time irradiation of energy and attachment of ink to the exposed part. In the aspect, the distance between the exposure units for the pixel units, which are the ink-philic regions irradiated with energy when the ink is applied, is short. Therefore, there is a possibility that a problem such as mixing of ink may occur when forming the pixel portion. As a method of avoiding such a problem, there is a method of performing energy irradiation and pixel formation at least twice as shown in FIG.

In this method, first, the photocatalyst-containing layer 6 is formed on the transparent substrate 2 as in the third embodiment (FIG. 5A). Next, energy is similarly irradiated using a photomask. In the above-described example, the photomask is designed so as to form the exposure portions for the pixel portions corresponding to all the pixel portions. The photomask 7 'is designed so that every other pixel portion is formed, and the first pixel portion exposure portion 11 is formed in the photocatalyst containing layer 6 using the photomask 7' (FIG. 5B )). Then, the exposure unit 11 for the first pixel unit, which has become the ink-philic region by the energy irradiation by the printing apparatus, for example, the intaglio 9,
The ink 10 is adhered to the inside and colored, and this is cured to form the first pixel portion 12 (FIG. 5C). The energy irradiation and coloring of the pixel portion using the printing apparatus are performed in the same manner as in the first example except for the shape of the photomask 7 '.

The first pixel portion 12 formed here is
It is preferable that the pixel portion itself be ink-repellent in order to prevent the second coloration of ink on the pixel portion by the printing device, and that the surface of the pixel portion be treated with an ink-repellent agent such as a silicone compound or a fluorine-containing compound. May be processed.

FIG. 6A shows the transparent substrate 2 on which the first pixel portion 12 is formed. For example, red (R), green (G),
In the case of forming pixel portions of three colors of blue and blue (B), FIG.
As shown in (A), the first red pixel portion (R
1) is formed, and then the first green pixel portion (G1) is skipped to form the first blue pixel portion (B1).
The second green pixel portion (G2) is formed by skipping the second red pixel portion (R2). As described above, the first pixel units 12 are formed every other first. An example of the photomask 7 used at this time is shown in FIG. 7 (A-1) or (B-1).

Next, the entire surface of the photocatalyst containing layer 6 on which the first pixel portion 12 is formed is irradiated with energy again. Note that the energy may be irradiated over the entire surface as described above, or the energy may be pattern-irradiated again using a photomask. Such a photomask for the second irradiation of the energy pattern is designed so as to form the second pixel portion exposure portion 13 between the first pixel portions 12, for example, as shown in FIG. 2) or a photomask as shown in (B-2) is used.

By irradiating the energy over the entire surface in this manner, energy is irradiated also on portions other than the first pixel portion exposure portion 11 to become ink-philic regions (FIG. 5).
(D)).

Then, the ink 10 is adhered to the ink-philic region by a printing device such as an intaglio 9 and colored, and the ink 10 is cured to form the second pixel portion 14. This second pixel section 1
Although 4 is illustrated as being formed at a distance from the first pixel unit in the drawing, it is formed so as to actually fill the space between the first pixel units 12. The exposure and coloring of the pixel portion using the printing apparatus are performed in the same manner as in the above-described example.

FIG. 6B shows a state in which the second pixel portion is also formed as described above. By forming the second pixel portion 14 so as to fill the space between the first pixel portions 12, three color pixel portions arranged in the order of red (R), green (G), and blue (B) from the left are formed. .

[0156] Finally, a color filter is formed by forming a protective layer on the pixel portion. It can be said that it is preferable to form the pixel portion twice in this manner for the following reasons.

In the case where the pixel portion is formed in a state where the light-shielding portion is not formed on the transparent substrate as in the above-described example, the light-shielding portion cannot be used as a partition. Therefore,
In the case where the pixel portion is formed by coloring the exposed portion for the pixel portion, which is an ink-philic region by energy irradiation, by various printing methods,
When the distance between the exposure portions for the pixel portion is small, that is, when the width of the ink-repellent region that is not irradiated with the energy is narrow, the ink of the pixel portion adjacent to and beyond the ink-repellent region is mixed when forming the pixel portion. The possibility arises. Therefore, when forming the pixel portion, it is desirable to form the pixel portion as far as possible from each other. In the above-described method for forming the pixel portion, when the first pixel portion 12 is formed,
Since energy pattern irradiation is performed so that every other pixel portion is formed, adjacent pixel portions formed for the first time can be separated from each other. In this manner, the first region having a relatively large ink-repellent region between the first region is formed.
Since it is possible to form the exposure portion 11 for the pixel portion,
When coloring is performed by the printing device 9 such as the intaglio 9, there is no possibility that the inconvenience of mixing the inks 10 of the adjacent pixel portions occurs. Next, the entire surface or the pattern is irradiated again with energy between the first pixel portions 12, and a portion between the first pixel portions 12 is made ink-philic, and the ink is mixed with the printing device 9 such as the intaglio 9. Not
Thus, a color filter free from defects such as color unevenness can be formed.

Further, according to this method, the distance between the pixel portions can be reduced or eliminated, so that a colored layer (an aggregate of pixel portions) having excellent smoothness can be formed. Note that when a pixel portion needs to be provided continuously, it is necessary to use such a method.

In the above-described method for forming a pixel portion, a photomask used when the second energy irradiation is pattern irradiation is, as shown in FIG. 7B-2, a region where the first pixel portion is formed. The whole may be exposed so that all the ink-repellent areas between the first pixel sections 12 are made ink-philic areas. Alternatively, as shown in FIG. A predetermined portion may be exposed to be a second pixel portion.

In the second energy irradiation, when irradiation is performed on the entire surface or by using a photomask as shown in FIG. 7B-2, a pixel portion obtained is as shown in FIG.
As shown in (1), there is no gap between the pixel portions, and they are formed continuously. In the case where a photomask as shown in FIG. 7A-2 is used, an ink-repellent region can be left between pixel portions. A color filter having voids can be formed. In the present invention, any method may be used, and the obtained color filter may be any type.

In the above-described method, every other one of the pixel portions 6 is formed in the first time. However, the present invention is not limited to this. If so, it may be changed depending on the shape of the pixel portion of the color filter, such as a staggered shape. In the above description, the pixel portion is formed twice. However, if necessary, the pixel portion may be formed three or more times.

(Regarding the method of forming the ink-repellent convex portions) In the present invention, the ink-repellent convex portions may be formed before forming the pixel portion. This is because, for example, when this ink-repellent convex portion is formed around the pixel portion region where the pixel portion is formed, the ink flows out around the color filter and the pixel portion cannot be formed accurately. This is because a failure can be prevented.

Such an ink-repellent convex portion is formed by forming a convex-portion exposed portion for forming an ink-repellent convex portion before forming the above-described pixel portion exposed portion. Is formed by forming an ink-repellent convex portion using a resin composition. As a photomask for forming such an exposed portion for a convex portion, for example, FIG. 7 (C-1) or (D-1)
The following can be mentioned. By exposing the photocatalyst-containing layer using these photomasks, first, an exposed portion for a convex portion is formed. In the case where the above-described photomask of FIG. 7 (C-1) is used, the exposing portion for a convex portion is formed with an exposing portion for a convex portion at an upper end side and a lower end side of a region where a pixel portion is formed. In the case where the photomask shown in (D-1) is used, a projection exposure portion is formed so as to surround a region where a pixel portion is formed. Next, by adhering and curing the resin composition on the exposed portion for the convex portion,
Ink-repellent convex portions can be formed.

After forming such ink-repellent convex portions,
A first pixel portion is formed using a photomask shown in the above-described method for forming a pixel portion (eg, FIG. 7C-2 or FIG. 7D-2), and then (A-2) or (B-2) The second pixel portion is formed by the photomask shown in FIG. ), A pixel portion is formed and a color filter is formed.

In the present invention, the area in which the ink-repellent convex portions are provided may be formed on the upper and lower sides of the pixel portion region or around the pixel portion region. It may be formed between pixel portions.

A process for forming such an ink-repellent convex portion will be described with reference to FIG. A member having the photocatalyst containing layer 6 formed so as to cover the transparent substrate 2 is prepared in the same manner as in the third embodiment shown in FIG.
(A)), energy is irradiated through the ink-repellent convex portion mask 15. In this manner, by irradiating the pattern with the energy through the mask for the ink-repellent convex portion, the exposed portion 16 for the ink-repellent convex portion is formed on the photocatalyst containing layer 6 on the boundary portion of the pixel portion. (B)).

The ink-repellent convex portion ink 17 such as a UV-curable resin monomer is adhered to the ink-repellent convex portion exposure section 16 by a printing device such as an intaglio plate 9 (FIG. 8).
(C)). The method of applying the ink for the ink-repellent convex portions is not limited to a method using a printing apparatus, and for example, a method using an ink-jet device or another method such as dip coating can also be used.

Then, the ink repellent convex ink 17 is cured by UV irradiation or the like, whereby the photocatalyst containing layer 6 is cured.
The ink-repellent convex portions 5 are formed on the surface (FIG. 8C).

By irradiating the entire surface or the pattern with energy from the photocatalyst containing layer 6 side to the member having the ink repellent protrusions 5 formed on the photocatalyst containing layer 6 in this manner, the ink repellent protrusions are formed. All the portions other than the portion where 5 is formed, or only the pixel portion forming portion is exposed to become a pixel portion exposing portion (FIG. 8D), and thereafter, in the same manner as described above, this portion is exposed. The pixel portion 4 is formed by depositing and curing the ink 10 using a printing device such as an intaglio 9 or the like, and the color filter 1 provided with the ink-repellent convex portion 5 can be manufactured (FIG. 8E )).

According to this method, since the photocatalyst-containing layer between the pixel portions is irradiated with energy in a pattern to provide the exposure for the ink-repellent convex portions, the ink-repellent convex portions can be formed with an arbitrary width. Therefore, the mask 15 for the ink-repellent convex portions is used.
Can be adjusted to adjust the width between the pixel portions.

In this embodiment, the ink-repellent convex portions are formed by changing the wettability of the photocatalyst-containing layer. However, the present invention is not limited to this. For example, the ink-repellent convex portions are formed by photolithography or the like. It may be provided with an ink convex portion.

(Irradiation Energy) In the present invention, as the energy for irradiating the photocatalyst-containing layer, light including ultraviolet light can be used. As a light source including such ultraviolet light, for example, a mercury lamp, a metal halide lamp, a xenon lamp, and the like can be given. The wavelength of light used for this exposure can be set within a range of 400 nm or less, preferably 380 nm or less, and the irradiation amount of light at the time of exposure is such that the exposed portion becomes less ink-friendly due to the action of a photocatalyst. The irradiation dose required for expression can be set.

When pattern irradiation is required when irradiating energy, it can be performed by pattern irradiation through a photomask using the above-described light source. Alternatively, a laser such as excimer or YAG may be used. It is also possible to use a method of drawing and irradiating in a pattern by using. However, such a method may have a problem that the apparatus is expensive, difficult to handle, and that continuous output cannot be performed.

Therefore, in the present invention, the photocatalytic reaction initiation energy is applied to the photocatalyst-containing layer, and the reaction speed increasing energy is applied in a pattern to the region where the photocatalytic reaction initiation energy is applied, thereby forming an ink-philic region. May be formed. By forming a pattern using such an energy irradiation method, it is possible to use a relatively inexpensive and easy-to-handle reaction speed increasing energy such as an infrared laser when forming a pattern, and thereby, as described above. This is because no problem occurs.

The reason why the pattern of the ink-affinity region having changed wettability can be formed by applying such energy is as follows. That is, first, the photocatalytic reaction of the photocatalyst with the photocatalyst containing layer is started by applying the photocatalytic reaction start energy to the region where the pattern is formed. Then, the reaction rate increasing energy is added to the region where the photocatalytic reaction start energy is added. By adding the reaction rate increasing energy in this manner, the photocatalytic reaction start energy is already added, and the reaction in the photocatalyst-containing layer in which the reaction is started by the catalytic action of the photocatalyst is rapidly promoted. Then, by applying the reaction rate increasing energy for a predetermined time, the change in the property in the property changing layer is changed to a desired range, and the pattern to which the reaction rate increasing energy is added is changed to the wettability-changed ink-philic area. It can be a pattern.

A. Regarding photocatalytic reaction initiation energy The photocatalytic reaction initiation energy used in this energy irradiation method refers to the energy at which a photocatalyst initiates a catalytic reaction for changing the characteristics of a compound in a photocatalyst-containing layer.

[0177] The amount of the photocatalytic reaction initiation energy added here is an amount that does not cause a sudden change in wettability in the photocatalyst-containing layer. If the amount of photocatalytic reaction initiation energy added is small, it is not preferable because the sensitivity in forming a pattern by adding the reaction rate increasing energy is unfavorable. The degree of change in the properties of the containing layer becomes too large, and the difference from the region to which the reaction rate increasing energy is added becomes unclear, which is not preferable. The amount of energy to be added is determined by performing preliminary experiments and the like on the amount of energy to be added and the amount of change in wettability in the photocatalyst-containing layer in advance.

The photocatalytic reaction initiation energy in this method is not particularly limited as long as it is an energy capable of initiating the photocatalytic reaction, but light is particularly preferred.

In the photocatalyst used in the present invention, the wavelength of light for initiating a catalytic reaction differs depending on the band gap. For example, if cadmium sulfide is 496 nm,
In the case of iron oxide, visible light of 539 nm is used, and in the case of titanium dioxide, ultraviolet light of 388 nm is used. Therefore, any light, whether visible light or ultraviolet light, can be used in the present invention. However, as described above, since the bandgap energy is high, it is effective as a photocatalyst, and titanium dioxide is preferably used as a photocatalyst because it is chemically stable, has no toxicity, and is easily available. It is preferable that the light includes ultraviolet light that initiates a catalytic reaction of titanium. In particular,
It is preferable that ultraviolet light in a range of 400 nm or less, preferably 380 nm or less is included.

Examples of the light source of light containing such ultraviolet light include various ultraviolet light sources such as a mercury lamp, a metal halide lamp, a xenon lamp, and an excimer lamp.

In the present invention, the range in which the photocatalytic reaction initiation energy is applied may be a part of the photocatalyst containing layer. For example, the photocatalytic reaction initiation energy is applied in a pattern, and the reaction rate increasing energy described later is also increased. It is also possible to form a pattern of an ink-philic region in which wettability has been changed by adding it in a pattern. However, for reasons such as simplification and simplification of the process, this photocatalytic reaction initiation energy is used to form a pattern. It is preferable to apply the reaction speed increasing energy in a pattern to the region where the photocatalytic reaction initiation energy is applied over the entire surface in such a manner as to form a pattern of the ink-philic region on the photocatalyst containing layer. Is preferable.

B. Next, the reaction rate increasing energy used in this method will be described. The reaction rate increasing energy used in this method refers to energy for increasing the reaction rate of a reaction that changes the wettability of the photocatalyst-containing layer initiated by the photocatalytic reaction initiation energy. In the present invention, any energy can be used as long as it has such an effect,
Among them, it is preferable to use heat energy.

The method for applying such thermal energy to the photocatalyst-containing layer in a pattern is not particularly limited as long as it can form a pattern by heat on the photocatalyst-containing layer. A method using a heat-sensitive head can be used. As such an infrared laser, for example, an infrared YAG laser (1064n) having an advantage of having high directivity and a long irradiation distance is used.
m) and a diode laser (LED; 830 nm, 1064 nm, 110) having an advantage of being relatively inexpensive.
0 nm), a semiconductor laser, a He-Ne laser, a carbon dioxide laser, and the like.

In this method, by applying the above-described photocatalytic reaction initiation energy, the photocatalyst is activated to start a change in wettability due to a catalytic reaction in the photocatalyst-containing layer, and a portion where the change in wettability occurs is generated. The reaction rate increase energy is added to the reaction area to promote the catalytic reaction, and the difference in the reaction rate between the region where the reaction speed increase energy is added and the region where the reaction speed increase energy is not added is used to change the pattern of the ink-philic region. Can be formed.

[0185] 2. Fourth Embodiment The fourth embodiment of the present invention is a manufacturing method for manufacturing the color filter according to the second embodiment of the present invention. (1) Wetting of an irradiated portion on a transparent substrate by energy irradiation Providing a photocatalyst-containing layer whose property changes in a direction in which the contact angle with the liquid decreases in a boundary portion of a pixel portion forming portion where a pixel portion is formed; and (2) a pixel portion on the transparent substrate Forming a pixel portion by a printing method using a relief printing plate, planographic printing plate, stencil printing plate, or intaglio printing plate in the formation portion. It has.

This method will be described with reference to FIG. First, the photocatalyst containing layer 6 is formed in a pattern only on the boundary portion of the pixel portion forming portion where the pixel portion is formed on the transparent substrate 2 (FIG. 9A). As a method of forming the photocatalyst-containing layer in a pattern as described above, for example, a method of forming a photolithographic method using a photosensitive sol-gel solution, a method of printing, and the like can be given.

In the transparent substrate 2 on which the photocatalyst containing layer 6 formed as described above is formed, on the portion where the photocatalyst containing layer 6 is not formed (pixel portion forming portion), the ink is applied by using a printing device such as an intaglio 9 or the like. 10 (FIG. 9B). At this time, the wettability of the surface of the transparent substrate 2 is considered to be ink-philic compared to the wettability of the surface of the photocatalyst containing layer 6. Therefore, when forming the pixel portion 6, the pixel portion is formed by adhering only to the pixel portion forming portion on the transparent substrate 2 without adhering the ink 10 on the photocatalyst containing layer exhibiting ink repellency. Then, the pixel portion 4 is formed between the photocatalyst containing layers 6 by curing the attached ink (FIG. 9C).

As described above, after the pixel section 4 is formed, the side on which the pixel section 4 is formed is irradiated with energy (FIG. 9D), whereby the photocatalyst containing layer 6 becomes ink-philic. This facilitates formation of a protective layer (not shown) provided as needed.

In the present embodiment, since the ink 10 adheres directly to the transparent substrate 2, it is preferable that the transparent substrate 2 is an ink-philic region as described above. Specifically, the surface tension is 40 mN / m as the contact angle with the liquid
The contact angle with a liquid having a surface tension of 40 mN / m is preferably 5 degrees or less, more preferably 1 degree or less. in this way,
This is because, by making the transparent substrate 2 an ink-philic region, the ink 14 is uniformly distributed on the transparent substrate, and problems such as color unevenness do not occur.

In this case, the viscoelastic layer described above may be formed on the transparent substrate 2 and the pixel portion may be formed on the viscoelastic layer by a printing method.

In this embodiment, the irradiation energy, the printing device, and the various inks are the same as those in the third embodiment described above, and the description thereof will be omitted.

C. A color liquid crystal panel is obtained by combining a color filter obtained in this manner with a counter substrate having a black matrix (light shielding portion) facing the color filter and sealing a liquid crystal compound therebetween. It is formed. The color liquid crystal panel obtained in this manner has the advantage of the color filter of the present invention, that is, the advantage that there is no color omission or color fading and the cost is advantageous.

Note that the present invention is not limited to the above embodiment. The above embodiment is an exemplification, and has substantially the same configuration as the technical idea described in the scope of the claims of the present invention. It is included in the technical scope of the invention.

[0194]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to Examples.

[Example 1] 1. Formation of Photocatalyst-Containing Layer 30 g of isopropyl alcohol and 0.4 g of MF-160E (manufactured by Tochem Products Inc.) whose main components are fluoroalkylsilane and 3 g of trimethoxymethylsilane (TSL8113 manufactured by Toshiba Silicone Co., Ltd.) 20 g of ST-K01 (produced by Ishihara Sangyo Co., Ltd.), which is an aqueous dispersion of titanium oxide as a photocatalyst, was mixed and stirred at 100 ° C. for 20 minutes. This was diluted three times with isopropyl alcohol to obtain a photocatalyst-containing layer composition.

The above composition was applied on a transparent substrate made of soda glass by a spin coater and dried at 150 ° C. for 10 minutes to form a transparent photocatalyst-containing layer (thickness 0.2 μm).

[0197] 2. Confirmation of formation of ink-philic region by exposure A mercury lamp (wavelength 365) was applied to this photocatalyst-containing layer through a mask.
pattern exposure at 70 mW / cm ² for 50 seconds to form an exposed portion, and the contact angle between the non-exposed portion and the exposed portion and the liquid was measured. In the non-exposed area, a contact angle with a liquid having a surface tension of 30 mN / m (manufactured by Junsei Chemical Co., Ltd., ethylene glycol monoethyl ether) was measured using a contact angle measuring device (CA-Z type manufactured by Kyowa Interface Science Co., Ltd.). As a result of measurement (30 seconds after the droplet was dropped from the micro syringe), it was 30 °. In the exposed portion, a surface tension of 5
As a result of similarly measuring the contact angle with a liquid of 0 mN / m (manufactured by Junsei Chemical Co., Ltd., wetting index standard solution No. 50),
7 degrees. As described above, it was confirmed that the exposed portion became the ink-philic region, and that pattern formation was possible due to the difference in wettability between the exposed portion and the non-exposed portion.

[0198] 3. Next, a photocatalyst containing a photocatalyst is formed on the same transparent substrate as described above.
A layer was formed. (Corresponding to FIG. 5A) This photocatalyst containing layer
From the photo provided with the open pattern shown in FIG. 7 (B-1).
Exposure with a mercury lamp (wavelength 365 nm) through a mask
(70mW / cm ^TwoIlluminance for 50 seconds) and the first pixel
The exposed part for the part is placed in the ink-philic area (with a surface tension of 50 mN / m).
(Converted to a contact angle with liquid of 7 degrees or less) (FIG. 5)
(Equivalent to (B)).

A red ink (color mosaic CR-7001), which is a UV curable ink manufactured by Fuji Film Ohlin, was applied to the exposed portion for the first pixel portion using a gravure printing machine. Then, after pre-baking at 90 ° C. for 5 minutes, UV exposure was performed for 3 seconds at 10 mW / cm ² (365 nm) using a xenon lamp, followed by heat treatment at 200 ° C. for 10 minutes. Similarly, a first pixel portion was formed by adhering green ink (color mosaic CG-7001) and blue ink (blue: color mosaic CB-7001).

[0200] 4. Formation of Second Pixel Part Next, exposure was performed with a mercury lamp (wavelength 365 nm) (at an illuminance of 70 mW / cm ² for 50 seconds) through a photomask provided with an opening pattern shown in FIG. The exposed portion for the two pixel portion is set in the ink-philic region (surface tension 50 mN / m
(Converted to a contact angle of 7 degrees or less with the liquid) (FIG. 5).
(Equivalent to (D)). Then, similarly to the formation of the first pixel portion, a second pixel portion was formed between the first pixel portions (FIG. 5).
(E), FIG. 6 (B)).

5. Formation of Protective Layer As a protective layer, a two-component mixed type thermosetting agent (SS7265 manufactured by Nippon Synthetic Rubber Co., Ltd.) is applied by a spin coater and cured at 200 ° C. for 30 minutes to form a protective layer. I got The obtained color filter was of high quality with no color loss or uneven color in the pixel portion despite no light-shielding portion.

Example 2 A photocatalyst-containing layer was formed in the same manner as in Example 1. Next, an ink-repellent convex portion was formed on the photocatalyst-containing layer as follows.

First, a UV-curable resin (ester acrylate resin: manufactured by Arakawa Chemical Industries, trade name: AQ-11) 10
g, 0.5 g of a curing initiator (trade name: Irgacure 184, manufactured by Ciba Specialty Chemicals) and 1.25 g of distilled water were stirred and mixed for 3 minutes to obtain an ink-repellent resin composition for convex portions.

Next, FIG. 7 is formed on the formed photocatalyst-containing layer.
Exposure was performed in the same manner as in Example 1 through a photomask provided with the opening pattern shown in (C-1), and the wettability was changed to obtain an exposed portion for a convex portion. Then, the above-described resin composition for ink-repellent convex portions was applied to the exposed portion for convex portions by a dip coater at 5 cm / sec. After applying at the speed of, UV exposure,
A 1.7 μm thick ink-repellent convex portion was formed.

A first photomask was prepared in the same manner as in Example 1 except that a photomask having an opening pattern shown in FIG. 7C-2 was used on the photocatalyst-containing layer on which the ink-repellent convex portions were formed. A pixel portion was formed.

Next, as shown in FIG.
A second pixel portion was formed in the same manner as in Example 1 except that a photomask having an opening pattern for exposing between pixel portions was used, and a protective layer was formed in the same manner as in Example 1.

Since the color filter thus obtained has the ink-repellent convex portions, there is no problem that ink flows out around the color filter and a pixel portion cannot be formed accurately. Example 1
Similarly, it was of high quality without color loss or uneven color in the pixel portion.

[Embodiment 3] 1. Formation of Photocatalyst-Containing Layer 3 g of isopropyl alcohol, fluoroalkylsilane (manufactured by Tochem Products Ltd .; MF-160E (trade name), N- [3- (trimethoxysilyl) propyl] -N
0.014 g of ethyl perfluorooctanesulfonamide in isopropyl ether (50% by weight), 2 g of titanium oxide sol (manufactured by Ishihara Sangyo Co., Ltd .; STS-01 (trade name)), silica sol (manufactured by Nippon Synthetic Rubber Co., Ltd .; Glasca) 0.6 g of HPC7002 (trade name) and alkylalkoxysilane (manufactured by Nippon Synthetic Rubber Co., Ltd .; HPC)
402II (trade name)) at 100 ° C.
Stirred for 0 minutes. This solution was coated on a 0.7 mm-thick non-alkali glass substrate by spin coating to obtain a 0.15 μm-thick photocatalyst-containing layer.

[0209] 2. Confirmation of formation of ink-philic region by exposure and reduction of fluorine amount 70 mW / cm ² (365 n) on the surface of this photocatalyst-containing layer by means of an ultra-high pressure mercury lamp through a lattice-shaped photomask.
m) by irradiating with ultraviolet light for 2 minutes, and measuring the contact angle with respect to n-octane (surface tension 21 mN / m) using a contact angle measuring device (CA-Z type manufactured by Kyowa Interface Science).
The unexposed part was 52 degrees, while the exposed part was 0 degrees.

The unexposed and exposed portions were subjected to elemental analysis using an X-ray photoelectron spectrometer (ESCALAB220-I-XL, manufactured by VGSientific). Quantitative calculation by Shary's back-round correction and Scofield's relative sensitivity coefficient correction shows the results obtained as relative values by weight when titanium (Ti) is 100, where the unexposed portion is titanium (Ti). Fluorine (F) 1279 with respect to 100, whereas fluorine (F) 6 with respect to titanium (Ti) 100 in the exposed portion.

From these results, it was found that the exposure of the photocatalyst-containing layer reduced the proportion of fluorine on the surface of the photocatalyst-containing layer, thereby changing the surface from ink-repellent to ink-philic.

[0212]

The present invention is characterized in that a pixel portion is formed by a printing method, and a photocatalyst containing layer is formed to form the pixel portion. Therefore, the change in wettability of the photocatalyst-containing layer can be used,
Even when the printing method is used, the pixel portion can be formed with high accuracy. Therefore, even when the printing method is used, it is possible to provide a high-quality color filter free from problems such as color omission and color unevenness.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view illustrating an example of a color filter according to a first embodiment of the present invention.

FIG. 2 is a schematic sectional view illustrating another example of the color filter of the first embodiment of the present invention.

FIG. 3 is a schematic sectional view illustrating an example of a color filter according to a second embodiment of the present invention.

FIG. 4 is a process chart for explaining a method of manufacturing a color filter according to a third embodiment of the present invention.

FIG. 5 is a process chart for explaining another example of the method for manufacturing a color filter according to the third embodiment of the present invention.

6 is a schematic plan view showing a first pixel portion and a second pixel portion in the manufacturing method shown in FIG.

FIG. 7 is a schematic plan view showing an example of a photomask used in the method for manufacturing a color filter of the present invention.

FIG. 8 is a process chart for explaining another example of the method of manufacturing the color filter according to the third embodiment of the present invention.

FIG. 9 is a process chart for explaining a method of manufacturing a color filter according to a fourth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Color filter 2 ... Transparent substrate 3 ... Photocatalyst containing layer 4 ... Pixel part 5 ... Ink-repellent convex part 6 ... Photocatalyst containing layer

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[Submission date] August 3, 2000 (2008.3.3)

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 ──────────────────────────────────────────────────続 き Continuing on the front page (72) The inventor, Manabu Yamamoto 1-1-1, Ichigaya-Kagacho, Shinjuku-ku, Tokyo Inside Dai Nippon Printing Co., Ltd. No. 1 Inside Dai Nippon Printing Co., Ltd. (72) Inventor Toyohiko Tanaka 1-1-1, Ichigaya Kagamachi, Shinjuku-ku, Tokyo F-term inside Dai Nippon Printing Co., Ltd. 2H048 BA02 BA11 BA58 BA60 BA66 BB02 BB07 BB14 BB24 BB44 2H091 FA02Y FB04 FB13 FC13 FC23 FD04 GA03 GA16 LA15 4F100 AA17C AA18C AA21C AA23C AA25C AA28C AG00 AK52C AR00A AR00C BA03 BA10A BA10B CC00B CC02B DD01C EH462 EJ542 GB41B05B05B41B05B41BJB

Claims (38)

[Claims] 1. A transparent substrate, a pixel portion provided with a plurality of colors in a predetermined pattern on the transparent substrate by a printing method using letterpress, planographic, stencil, or intaglio, and a pixel portion provided for forming the pixel portion. And a photocatalyst-containing layer comprising at least a photocatalyst and a binder, and having a photocatalyst-containing layer whose wettability changes so that the contact angle with a liquid is reduced by energy irradiation. 2. The color filter according to claim 1, wherein the photocatalyst-containing layer is formed on the transparent substrate, and the pixel portion is provided on the photocatalyst-containing layer. 3. The color filter according to claim 2, wherein a distance between the pixel units is 2 μm or less. 4. The color filter according to claim 2, wherein an ink-repellent convex portion is formed on the photocatalyst containing layer at a boundary portion of the pixel portion. 5. The color filter according to claim 1, wherein a pixel portion is formed on said transparent substrate, and said photocatalyst containing layer is provided at a boundary portion of said pixel portion. 6. The wettability on the transparent substrate has a surface tension of 4.
The color filter according to claim 5, wherein a contact angle with a liquid of 0 mN / m is less than 10 degrees. 7. The photocatalyst-containing layer contains fluorine, and when the photocatalyst-containing layer is irradiated with energy, the action of the photocatalyst lowers the fluorine content on the surface of the photocatalyst-containing layer as compared to before the energy irradiation. The color filter according to any one of claims 1 to 6, wherein the photocatalyst-containing layer is formed so as to perform the above operation. 8. Irradiating energy on the photocatalyst-containing layer, the fluorine content in a portion where the fluorine content is reduced is 10 or less when the fluorine content in a portion not irradiated with energy is 100. The color filter according to claim 7, wherein the color filter is provided. 9. The method according to claim 1, wherein the photocatalyst is titanium oxide (Ti).
O ₂ ), zinc oxide (ZnO), tin oxide (SnO ₂ ), strontium titanate (SrTiO ₃ ), tungsten oxide (WO ₃ ), bismuth oxide (Bi ₂ O ₃ ), and iron oxide (Fe ₂ O ₃ ) The color filter according to any one of claims 1 to 8, wherein the color filter is one or more substances selected from the group consisting of: 10. The photocatalyst is titanium oxide (TiO ₂ ).
The color filter according to claim 9, wherein 11. Quantifying the content of fluorine in an unirradiated portion of the surface of the photocatalyst-containing layer by X-ray photoelectron spectroscopy, when the Ti element is 100, the fluorine element is 500 or more. The color filter according to claim 10, further comprising a photocatalyst-containing layer in which the elemental fluorine is contained on the surface of the photocatalyst-containing layer at a certain ratio. 12. The color filter according to claim 1, wherein the binder is an organopolysiloxane having a fluoroalkyl group. 13. The method according to claim 12, wherein the binder is Y _n SiX _(4-n) (where Y represents an alkyl group, a fluoroalkyl group, a vinyl group, an amino group, a phenyl group or an epoxy group;
Represents an alkoxyl group or a halogen. n is an integer from 0 to 3. 12. An organopolysiloxane which is one or more hydrolytic condensates or co-hydrolytic condensates of the silicon compound represented by the formula (1). The color filter according to 1. 14. The color filter according to claim 13, wherein 0.01% by mole or more of a silicon compound containing a fluoroalkyl group is contained in the silicon compound constituting the organopolysiloxane. 15. A contact angle with a liquid having a surface tension of 40 mN / m on the photocatalyst-containing layer is 10 degrees or more in a portion not irradiated with energy and less than 10 degrees in a portion irradiated with energy. The color filter according to any one of claims 1 to 14, wherein: 16. The pixel unit according to claim 1, wherein the pixel unit is a pixel unit in which a plurality of colors are provided in a predetermined pattern on the transparent substrate by a printing method using an intaglio.
The color filter according to claim 5. 17. The method according to claim 16, wherein the pixel portion formed by the printing method using the intaglio is a pixel portion formed by ink having a viscosity in a range of 0.1 to 10 poise. The color filter described. 18. The pixel portion colored by the printing method, wherein the pixel portion is colored by a printing method using an aqueous ink. The color filter according to 1. 19. The pixel portion colored by the printing method according to claim 1, wherein the pixel portion is colored by a printing method using oil-based ink. The color filter according to 1. 20. The color filter according to claim 18, wherein the pixel portion colored by the printing method is a pixel portion colored by a printing method using a UV curable ink. . 21. A step of (1) providing a photocatalyst-containing layer on the transparent substrate, the wettability of an irradiated portion being changed by energy irradiation in a direction in which a contact angle with a liquid decreases, and (2) providing a photocatalyst-containing layer on the transparent substrate. A step of irradiating energy to the pixel portion forming portion, which is a portion for forming the pixel portion on the photocatalyst containing layer, to form an exposure portion for the pixel portion; and (3) a relief printing process for the exposure portion for the pixel portion; Coloring by a printing method using a lithographic plate, a stencil plate or an intaglio plate to form a pixel portion. 22. After forming the exposure portion for the pixel portion, the step of forming a pixel portion by coloring the portion by a printing method using a relief printing plate, a lithographic printing plate, a stencil printing plate or an intaglio printing plate includes the steps of: (B) forming a first pixel portion exposure portion by irradiating energy to a part of the pixel portion formation portion, which is a portion forming the pixel portion, to form a first pixel portion exposure portion; A step of forming a first pixel portion by coloring using a lithographic, stencil, or intaglio printing method, and (c) exposing a pixel portion forming portion, which is a portion of the photocatalyst-containing layer, to form a remaining pixel portion. Forming an exposure part for the second pixel part by using
22. (d) coloring the exposed portion for the second pixel portion by a printing method using a relief printing plate, planographic printing plate, stencil printing plate, or intaglio printing to form a second pixel portion. Manufacturing method of color filter. 23. Before forming the exposure portion for the pixel portion,
22. An ink-repellent convex portion for forming an ink-repellent convex portion, wherein a convex portion is formed by using a resin composition in the convex portion exposed portion. Item 23. The method for producing a color filter according to item 22. 24. The method for manufacturing a color filter according to claim 23, wherein said ink-repellent convex portions are formed between said pixel portions. (1) A photocatalyst-containing layer whose wettability of an irradiated portion changes in a direction in which a contact angle with a liquid is reduced by energy irradiation on a transparent substrate is formed in a pixel portion where a pixel portion is formed. And (2) forming a pixel portion in the pixel portion forming portion on the transparent substrate by a printing method using letterpress, planographic, stencil, or intaglio. Manufacturing method of color filter. 26. The method for producing a color filter according to claim 25, wherein the wettability on the transparent substrate is less than 10 degrees as a contact angle with a liquid having a surface tension of 40 mN / m. 27. The method according to claim 2, wherein the energy applied to the photocatalyst-containing layer is light including ultraviolet light.
The method for producing a color filter according to any one of claims 1 to 26. 28. An energy applied to the photocatalyst-containing layer is a photocatalytic reaction start energy and a reaction speed increasing energy, and the portion irradiated with the photocatalytic reaction start energy is irradiated with the reaction speed increasing energy to thereby form an exposed portion. 3. The method of claim 2, wherein
The method for producing a color filter according to any one of claims 1 to 26. 29. The method according to claim 28, wherein the photocatalytic reaction initiation energy is light including ultraviolet light, and the reaction speed increasing energy is heat energy. 30. The method according to claim 29, wherein the thermal energy is applied by an infrared laser. 31. A contact angle with a liquid having a surface tension of 40 mN / m on the photocatalyst-containing layer is 10 degrees or more in a portion not irradiated with energy and less than 10 degrees in a portion irradiated with energy. The method for manufacturing a color filter according to any one of claims 21 to 30, characterized in that: 32. A pattern of relief printing, planographic printing, stencil printing or intaglio printing is formed such that the width of the ink adhered by the printing method is smaller than the width of the pixel portion to be formed at the time of coloring by the printing method. 3. The method according to claim 2, wherein
The method for producing a color filter according to any one of claims 1 to 31. 33. The method according to claim 21, wherein the coloring of the pixel portion forming portion by a printing method is coloring by a printing method using an intaglio. A method for producing the color filter as described above. 34. The method for producing a color filter according to claim 33, wherein the viscosity of the ink used for coloring in the printing method is in the range of 0.1 to 10 poise. 35. A relief printing plate, a lithographic printing plate,
35. The color filter according to any one of claims 21 to 34, wherein the coloring in a printing method using a stencil or an intaglio is a coloring in a printing method using an aqueous ink. Law. 36. A relief printing plate, a lithographic printing plate,
35. The color filter according to any one of claims 21 to 34, wherein the coloring in a printing method using a stencil or an intaglio is coloring by a printing method using an oil-based ink. Law. 37. A relief printing plate, a lithographic printing plate,
37. The method for producing a color filter according to claim 35, wherein the coloring in a printing method using a stencil or an intaglio is coloring by a printing method using a UV curable ink. 38. A color filter according to any one of claims 1 to 20, wherein the color filter faces the color filter,
And a substrate provided with a light-shielding portion, wherein a liquid crystal compound is sealed between the two substrates.