JPH11242111A - Composition for color filter protective film, substrate with color filter, method for producing the same, and liquid crystal display device - Google Patents

Abstract

(57) [Problem] To provide a composition for a color filter protective film which has good flatness and adhesion, facilitates liquid management of the composition for a protective film, and is easy to handle. SOLUTION: This composition contains (A) a photopolymerizable polyfunctional (meth) acrylate monomer and oligomer, (B) a non-acrylic epoxy group-containing resin, (C) a silane coupling agent, and (D) water. A) / (B) = 50 / 50-95
/ 5, and an external amount of 0.3 to 5 parts by weight of water is added to 100 parts by weight of the composition excluding the solvent and water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a composition for a color filter protective film, a substrate with a color filter, a method for producing the same, and a liquid crystal display device.

[0002]

2. Description of the Related Art In recent years, light-receiving display elements such as liquid crystal display elements have been remarkable as being able to replace CRTs (cathode ray tubes) which have occupied the mainstream of conventional display devices because of their features such as thinness, lightness and low power consumption. Shows progress. In order to colorize this display element and obtain display performance closer to CRT,
A color filter is indispensable, and various materials and methods have been proposed so far.

[0003] For example, a pigment is dispersed in a photosensitive resin in advance and patterned by a photolithography method. A so-called pigment dispersion method, a substrate using an inorganic or organic pigment or dye, screen, offset, gravure printing or the like is used. There are a printing method, an electrodeposition method and the like in which a pattern is formed directly on the upper surface.

[0004] However, these substrates with color filters have a problem that thickness unevenness usually occurs in each color and a film thickness step between the colors (generally 0.1 μm or more). Such uneven thickness and steps between colors tend to cause problems such as inability to obtain a sufficient contrast ratio and gradation when such a substrate with a color filter is used as one electrode substrate of a liquid crystal display element.

In particular, in recent years, liquid crystal display elements such as STN type liquid crystal display elements and IPS type liquid crystal display elements using a multiple line simultaneous selection driving method have been improved in response speed, and the thickness unevenness and color have been increased more than before. There is an increasing demand for reducing the level difference. In particular, the step between colors is 0.05 μm
Hereinafter, more preferably, a thickness of 0.02 μm or less is required.

In such a color filter, a transparent protective film is often formed on the colored layer for the purpose of protecting the colored layer. Such a protective film also has a function of flattening the coloring layer. Therefore, it is important to use a protective film having a high flattening function. Other properties required for the protective film include adhesion to a transparent electrode (such as ITO) formed thereon, patterning by etching, appropriate hardness, adhesion to glass, and a seal used for a liquid crystal display element. And adhesion to the agent.

Several materials have been proposed for such a protective film for a color filter, and are roughly classified into epoxy-based, acrylic-based, polyimide / polyamide-based, and silicone-based materials.

[0008] Acrylic resins are disclosed in JP-A-61-171.
No. 24, JP-A-61-141401, JP-A-62-89022, etc., which are generally excellent in flatness and heat resistance, but have good adhesion to a glass substrate and a transparent electrode. Have poor adhesiveness and the solvent resistance tends to be insufficient. Examples of the epoxy type include, for example, JP-A-7-188392 and JP-A-7-188392.
Although it is described at the back of -188383, etc., although the adhesion with the glass substrate and the adhesion with the transparent electrode are excellent, the flatness,
There was a problem that heat resistance was easily lacking.

Therefore, the present inventors have disclosed in Japanese Patent Laid-Open No. 6-2949.
07, a system in which epoxy and acrylic are mixed, that is, (A) a photopolymerized polyfunctional (meth) acrylate monomer and / or oligomer, (B) a non-acrylic epoxy group-containing resin, (C) a photopolymerization initiator, and (D) A protective film composition consisting of epoxy curing agent was proposed. According to the present composition, a protective film having characteristics having both advantages, that is, having excellent flatness and heat resistance of an acrylic resin, and excellent heat resistance and adhesion of a substrate to an epoxy resin. Can be obtained.

[0010]

However, in the above-mentioned epoxy and acrylic mixed systems, the mixing ratio for simultaneously exhibiting the advantages of the respective resins is narrow, and in particular, both of the flatness and the adhesion to the substrate are not necessarily improved. Sufficient characteristics could not be obtained. Specifically, increasing the ratio of the acrylic component, which is particularly effective for flatness, results in poor adhesion to the substrate and adhesion to the transparent electrode, and the ratio of the epoxy component effective for adhesion to the substrate. When the number of layers increases, the flatness tends to be lost.

In order to further solve this problem, Japanese Unexamined Patent Publication No.
In 294907, by adding the (E) silane coupling agent in addition to the four components (A) to (D), the ratio of the acrylic component can be increased without losing the adhesion to the substrate. It also proposes. However, even when the protective film is formed on the color filter manufactured by the pigment dispersion method, the unevenness of the surface is 0.03.
０．１0.10 μm, which is beginning to be insufficient with recent liquid crystal display devices in which high-speed response and multi-gradation are progressing.

For this reason, flatness and adhesion are good,
There has been a demand for a composition for a protective film, in which the liquid composition of the composition for a protective film is easy and easy to handle.

[0013]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems, and as a result, by forming a protective film obtained by curing a specific composition, the present invention has been achieved. It was found to be extremely effective.

That is, the present invention comprises the following components (A), (B), (C) and (D), and the main component (A)
And the weight ratio of (B) is (A) / (B) = 50 / 50-
95/5, wherein 0.3 to 5 parts by weight of water is added in an external amount relative to 100 parts by weight of the composition excluding the solvent and water. . (A) Photopolymerizable polyfunctional (meth) acrylate monomer and / or oligomer (B) Non-acrylic epoxy group-containing resin (C) Silane coupling agent (D) Water

Further, there is provided a composition for a color filter protective film, wherein an epoxy curing agent is further added to the non-acrylic epoxy group-containing resin 100 in a weight ratio of 3 to 90.

Further, in a substrate with a color filter having a substrate, a colored layer formed on the substrate, and a protective film formed thereon, the protective film is formed by curing the composition for a color filter protective film. A substrate provided with a color filter is provided.

Further, in the method of manufacturing a substrate with a color filter in which a colored layer is formed on a substrate and a protective film is formed thereon, the composition for a color filter protective film is supplied onto the colored layer and then irradiated with light. And then heating the composition for a color filter protective film to provide a method for producing a substrate with a color filter.

A liquid crystal display, wherein the substrate with a color filter or the substrate with a color filter manufactured by the method for producing the substrate with a color filter is used as at least one substrate constituting a liquid crystal display element. An element is provided.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The composition for a color filter protective film of the present invention comprises the following components (A), (B), (C) and (D).
including. (A) Photopolymerizable polyfunctional (meth) acrylate monomer and / or oligomer (B) Non-acrylic epoxy group-containing resin (C) Silane coupling agent (D) Water The resin components (A) and ( The weight ratio of (B) is (A) / (B) = 50/50 to 95/5.

The photopolymerizable polyfunctional (meth) acrylate of the component (A) in the present invention is an ultraviolet ray. Monomers or oligomers having a plurality of carbon-carbon unsaturated bonds at their terminals or side chains, such as acryloyl groups and methacryloyl groups, which are photosensitive groups that can be polymerized or cross-linked by irradiation with light such as visible light. The molecular weight is preferably about 100 to 1,000.

Specific examples of the polyfunctional (meth) acrylate monomer include 1,3-butanediol di (meth) acrylate, 1,4-butanediol di (meth) acrylate,
1,6-hexanediol di (meth) acrylate, diethylene diol di (meth) acrylate, neopentyl glycol di (meth) acrylate, hydroxypiparic acid ester neopentyl glycol di (meth) acrylate, tripropylene glycol di (meth) acrylate Acrylate, trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol hexa (meth) acrylate and the like are exemplified. The oligomer may be any one containing these monomers as a single component or a copolymer component.

As the non-acrylic epoxy group-containing resin of the component (B), a photopolymerizable epoxy group-free resin having no acrylic group is used. Specifically, alicyclic epoxy resin, phenol novolak type epoxy resin, cresol novolak type epoxy resin, bisphenol A
Epoxy resin, bisphenol F epoxy resin, glycidylamine epoxy resin, brominated epoxy resin,
There are epoxy-modified silicone resin, epoxy-modified melamine resin, epoxy-modified melamine resin, epoxy-modified urethane resin, and the like.

The non-acrylicity of the resin of the component (B) means that the resin does not substantially have a photopolymerizable (meth) acrylate group. That is, the non-acrylic epoxy group-containing resin has substantially no photocurability. Among these, an alicyclic epoxy resin is particularly preferable from the viewpoint of light resistance and transparency.

The photopolymerizable polyfunctional (meth) acrylate monomer and / or oligomer as the component (A),
The mixing ratio of each other with the non-acrylic epoxy group-containing resin as the component (B) is (A) 50 to 95 parts by weight by weight.
(B) It is in the range of 5 to 50 parts by weight. If the blending ratio of the component (A) is too high, the flatness is good, but the adhesion to the substrate tends to decrease. If the blending ratio of the component (A) is too low, the flatness tends to be impaired. More preferably, it is within the range of (A) 60 to 80 parts by weight and (B) 20 to 40 parts by weight.

The following are examples of the silane coupling agent of the component (C). γ-glycidoxypropyltrimethoxysilane, β- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, γ-aminopropyltrimethoxysilane, γ-methacryloxypropyltrimethoxysilane and the like. The amount of the silane coupling agent to be added is an amount based on 100 parts by weight of the solvent to be diluted (reactive diluents described below are not included in this, the same applies hereinafter) and the component (D) excluding water. 0.1 to 20 parts by weight, more preferably 1 to 10 parts by weight. By adding a silane coupling agent, moisture resistance is improved,
In particular, the adhesion to glass is significantly improved.

The water of the component (D) is a component that appropriately promotes the hydrolysis reaction of the silane coupling agent, and is the main component of the composition for a protective film of the present invention (A) and (B). Both the flatness and adhesiveness of the resin can be sufficiently enhanced. The amount of water to be added is 0.3 to 5 parts by weight, more preferably 0.5 to 2 parts by weight, based on 100 parts by weight of the composition excluding the solvent to be diluted and the water. In particular, 0.5 to 1.5 times the equivalent of the silane coupling agent is preferable.

If the amount of water is less than the above range, the hydrolysis reaction of the silane coupling agent is not sufficiently promoted, so that the adhesion to the substrate tends to be insufficient. In some cases, the dissolved liquid becomes cloudy or the viscosity increases sharply after blending, thereby shortening the pot life.

As the protective film composition of the present invention, a photopolymerization initiator can be added. Examples of the photopolymerization initiator include 2-hydroxy-2-methyl-1-phenylpropan-1-one, benzoin isobutyl ether, benzophenone, biacetyl, benzyl, benzoyl, benzyldimethylketal, tetramethylthiuram sulfide, and di- tert-butyl peroxide,
1-hydroxycyclohexyl phenyl ketone, 1-
(4-Isopropylphenyl) -2-hydroxy-2-
Methylpropan-1-one, thioxanthone, methylthioxanthone, 2-chlorothioxanthone and the like can be used.

The addition amount of the photopolymerization initiator is 0.1 to 20 parts by weight based on 100 parts by weight of the composition excluding the solvent to be diluted and water as the component (D). Further, a suitable sensitizer such as 4,4-bis (diethylamino) benzophenone to the photopolymerization initiator benzophenone may be added.

As the protective film composition of the present invention, an epoxy curing agent of the component (E) can be further added. As the epoxy curing agent, an acid anhydride curing agent, an aromatic polyamine curing agent, an aliphatic polyamine curing agent, a cycloaliphatic polyamine curing agent, a polyamide curing agent, or the like can be used. By adding an epoxy curing agent, it is possible to prevent the moisture and heat resistance from becoming unstable due to a change in another composition.

The amount of the epoxy curing agent added is preferably 3 parts by weight or more and 90 parts by weight or less, more preferably 70 parts by weight or less, based on 100 parts by weight of the epoxy resin. When an acid anhydride-based curing agent is used as the epoxy curing agent, Lewis bases such as 2-ethyl-4-methylimidazole may be further added as a curing accelerator.

In the protective film composition of the present invention, a reactive diluent may be further added as the component (F). Examples of the reactive diluent include acrylic type such as acrylic acid and methacrylic acid, epoxy type such as alicyclic epoxy diluent (Celoxide 3000 manufactured by Daicel Chemical Industries), and (meth) acrylic monomer having an alicyclic epoxy group (Daicel "CYCLOMER M-100", "CYC
LOMERA-200 "," CELOXIDE 2000 "
And the like.

The protective film composition according to the present invention includes:
If necessary, various additives such as an antioxidant, a light stabilizer, a photopolymerization inhibitor, an antifoaming agent, and a leveling agent can be added.

Further, in order to increase the hardness of the cured film, the above composition is prepared by adding inorganic particles such as silica sol and alumina sol in an amount of 0 to 100 parts by weight of the composition excluding the solvent for diluting and water. 30 parts by weight, preferably about 1 to 10 parts by weight can be added. Further, by adding these sols, the effect of the silane coupling agent as an adhesion aid to the substrate can be enhanced.

The thickness of the color filter protective film formed from the composition for a protective film of the present invention is about 1 to 100 μm after curing. If it is thinner than this, the flattening performance is insufficient, and if it is thicker than this, transparency may be insufficient, cracks or the like may easily occur, and the strength may be reduced. In particular, when the thickness is 1.3 to 20 μm, and more preferably 2 to 5 μm, sufficient flatness can be obtained, which is preferable.

The composition for a protective film is supplied so as to form a film on the substrate on which the colored layer is formed. As a method for forming the colored layer, known methods such as a pigment dispersion method, an offset printing method, an electrodeposition method, a dyeing method, and an ink jet method can be used. The pattern of the color filter is not particularly limited. For example, a stripe pattern,
Any of a mosaic pattern and a delta pattern may be used.

A light shielding pattern such as a black matrix may be formed between the patterns of the colored layer. The black matrix may be formed by patterning a black photosensitive resist by a photolithography method in addition to the deposition method of metal chromium or the like. May be done. This light shielding pattern may be provided in the same plane as the colored layer, between the colored layer and the substrate, or on the colored layer.

In the present invention, the composition for a protective film is supplied onto the substrate on which the colored layer has been formed as described above to form a film. As the film forming method, a known method for forming a thin film using a usual coater such as a roll coater, an air knife coater, a blade coater, a rod coater, a bar coater, or a spin coater, or various printing machines can be used.

When supplying the composition for a protective film, it is usually used as a solution diluted in a solvent in order to improve fluidity. As the solvent, a general organic solvent in which each component other than the inorganic substance particles of the present invention is soluble can be used. For example, acetone, methyl ethyl ketone, ketones such as methyl isobutyl ketone, ethylene glycol, polyhydric alcohols and ethers such as ethylene glycol monomethyl ether acetate, ethylene glycol dimethyl ether acetate, diethylene glycol monomethyl ether acetate, polyethylene glycol monoethyl ether acetate, and the like. Organic solvents can be used.

These solvents may be used alone or as a mixture of two or more. Although the solid content concentration in the organic solvent solution also depends on the film forming method, it is usually sufficient that the concentration is 20 to 80% by weight. The optimum concentration may be determined experimentally according to the film forming method. However, the higher the solid concentration, the better the flatness. Although it depends on the method, it is usually preferable that the content be 40 to 80% by weight.

The substrate used in the present invention includes:
There is no particular limitation. For example, polyethylene terephthalate, polyester, diacetate, polycarbonate,
Examples thereof include an organic sheet such as polyether sulfone and a transparent substrate such as various glass plates. The thickness of the substrate is selected depending on the purpose, and is not particularly limited. When a glass substrate is used for a liquid crystal display device, a thickness of about 0.3 to 1.5 mm is usually used.

Hereinafter, a method for manufacturing an electrode substrate with a color filter according to the present invention will be described in the case where the pigment dispersion method is employed. First, a light-shielding layer called a black matrix is formed on a transparent substrate such as glass or plastic. This light-shielding layer is provided in a TFT-type liquid crystal display element in order to maintain the characteristics of the transistor or to prevent a decrease in contrast ratio. It should just be formed.

In a simple matrix drive represented by an STN type liquid crystal display element, the contrast ratio of these elements is originally lower than that of a TFT type, and a black matrix is omitted in order to pursue cost reduction. Or, it is often formed by superposition of three primary colors, or formed by a colored resist. Next, a colored resist containing a pigment such as a pigment and a photosensitive resin is applied to the substrate, exposed through a photomask having a predetermined pattern shape, and then unexposed portions are removed by development to form a colored layer pattern. To form At the time of exposure, a polyvinyl alcohol layer or the like may be used in combination with the colored resist layer as an oxygen barrier film. This operation is further repeated twice with another color to form a color filter of three primary colors.

On this, a layer made of the composition for a protective film is formed by the above-mentioned film forming method. The curing of the composition layer may be performed by irradiating an active energy ray such as an ultraviolet ray, a visible light ray, an electron beam or the like such as a high pressure mercury lamp or a xenon lamp. Patterning and irradiation may be performed through a photomask, and an unexposed portion may be removed with a solvent or the like to form a pattern.

Next, an electrode layer is formed on the protective film. The electrode layer is generally made of a metal such as aluminum or chromium, or a transparent conductive film such as indium tin oxide (ITO) or tin oxide, but is not limited thereto. Also, the electrode layer may be patterned corresponding to the display,
When used as a common electrode, it may be a solid electrode. The method for forming the electrode layer is not particularly limited, but from the viewpoint of making the film thickness uniform, an evaporation method, a sputtering method, or the like is preferably used.

In the present invention, an insulating film such as SiO ₂ or TiO ₂ , an active element such as a TFT, a MIM, a thin film diode, a retardation film, a polarizing film, a reflection film, A film, a photoconductive film, or the like may be formed.

Further, in the case of a liquid crystal display element, an alignment film is formed on the substrate with electrodes as necessary. This may be obtained by rubbing an organic resin film of polyamide, polyimide, polyvinyl alcohol, or the like, may be formed by oblique deposition of SiO or the like, or may be used by applying a vertical alignment agent.

Further, as a method of manufacturing a liquid crystal display element, a commonly used method can be employed. That is,
One of the pair of substrates is the electrode substrate with a color filter, the other is an appropriately patterned electrode substrate, a liquid crystal alignment film is formed on the substrate as needed, and then the pair of substrates is The sides are opposed to each other, the peripheral portion is sealed, and the liquid crystal is sealed therein. This allows
A color liquid crystal display having high definition can be obtained.

When the substrate with a color filter of the present invention is viewed from the viewpoint of application, a substrate of a liquid crystal display element, a combination with a cathode ray tube, a light receiving surface of an image pickup tube and the like can be mentioned. Further, in the present invention, since a color filter having extremely small thickness unevenness can be obtained, the present invention is preferable for a liquid crystal display device in which the precision of substrate spacing is strict.

[0050]

Examples 1 to 17 First, a chromium film was formed to a thickness of 100 nm on a transparent glass substrate by magnetron sputtering. After forming a pattern with a photosensitive resist thereon using a photomask, the chromium film was etched to form a light shielding pattern.

Next, a red photosensitive coloring agent was coated, and the photosensitive coloring agent was exposed thereon using a photomask, followed by etching to form a colored layer having a red pattern. Similarly, green and blue colored patterns were sequentially formed between the light shielding patterns as colored layers.

Next, as compositions for the protective film, Tables 1 to 4
A solution was prepared by dissolving the described compositions (Examples 1 to 8 were Examples and Examples 9 to 17 were Comparative Examples) in propylene glycol monomethyl ether acetate to a solid content concentration of 50% by weight. In addition, since the solvent contains a small amount of water (approximately 0.1 wt%) even in the solvent, the amount of water is also described. Examples 9 to 14 are examples in which the amount of water is almost only the water contained in the solvent and water is not actively added.

The turbidity / turbidity of the prepared liquid was confirmed with a point light, and those with white turbidity / turbidity were evaluated as x, and those not observed were evaluated as ○. Furthermore, the pot life was evaluated. The pot life is measured by measuring the viscosity of the liquid immediately after the preparation and 24 hours after the preparation. The case where the viscosity of the liquid is increased by 20% or more compared to the time immediately after the preparation is x, and the case where the viscosity is increased by 10 to 20% is ％. The case where it increased by less than 10% was evaluated as ○.

These compositions were applied to the entire surface of the substrate on which the colored layer had been formed, using a spin coater so that the thickness of the cured protective film was 2.0 μm. Thereafter, using a high-pressure mercury lamp, 2000 mJ / cm ² (wavelength 365 n
m) was irradiated. Further, it was heated at 200 ° C. for 30 minutes to be completely cured.

With respect to the substrate with a color filter manufactured by the above method, the surface roughness before and after the formation of the protective film on the colored layer was examined using a surface roughness meter. Regarding the adhesion to glass, each of the substrates on which the cured film was formed was immersed in boiling water for 5 hours, and then subjected to a grid test. This test was repeated 10 times, and all of the 10 tests showed no peeling at all. ○ During 10 tests, peeling was observed for 1 to 3 tests. △ During 10 tests When peeling was observed in four or more tests, it was evaluated as x.

Tables 1 to 4 show the results of each evaluation. In Example 17, the film was not formed because the liquid became cloudy and the viscosity increased greatly. Of the epoxy resins in the table, CN is a cresol novolak type epoxy resin (molecular weight: 915, epoxy equivalent: 210 g / eq), and PN is a phenol novolak type epoxy resin (epoxy equivalent: 175)
g / eq) and EH are alicyclic epoxy resins (“EHPE3150” (manufactured by Daicel Chemical Industries, Ltd., epoxy equivalent 170 to 20).
0 g / eq)).

In the polyfunctional acrylates, PA is pentaerythritol triacrylate, TA is trimethylolpropane triacrylate, and CA is cyanuric acrylate.

Further, among the epoxy curing agents, MH is methylhexahydrophthalic anhydride and TMA is trimellitic anhydride. Also, 2-ethyl-4-methylimidazole is used as an epoxy curing catalyst, 2-hydroxy-2-methyl-1-phenylpropan-1-one is used as a sensitizer, and γ-glycidyl is used as a silane coupling agent. Xypropyltrimethoxysilane was used, and a silicone-based leveling agent was used.

[0059]

[Table 1]

[0060]

[Table 2]

[0061]

[Table 3]

[0062]

[Table 4]

Example 18 A conductive film made of ITO was formed on the substrate with a color filter manufactured in Example 6, and was patterned in a stripe shape.
A first substrate was formed by forming a polyimide alignment film by rubbing. A second substrate was formed by forming a conductive film of ITO on a glass substrate, patterning the conductive film in a stripe shape, and forming a polyimide alignment film by rubbing.

The two substrates were sealed around the periphery to form empty cells, a nematic liquid crystal was sealed therein, and the injection port was sealed to form an STN type liquid crystal display cell. A retardation plate and a polarizing plate were arranged on both sides of the cell, and an STN liquid crystal display device was produced. With this liquid crystal display device, color display with less unevenness was obtained.

[0065]

According to the present invention, (A) a photopolymerizable polyfunctional (meth) acrylate monomer and / or oligomer;
It contains (B) a non-acrylic epoxy group-containing resin, (C) a silane coupling agent and (D) water, and the weight ratio of the main components (A) and (B) is (A) / (B) = 50/50. ~ 95
/ 5, and an external amount of 0.3 to 5 parts by weight of water is added to 100 parts by weight of the composition excluding the solvent and water. As a result, a composition for a protective film having good flatness, good adhesion, easy management of a liquid for the composition for a protective film, and easy handling can be obtained.

The present invention can be applied to various applications within a range that does not impair the effects of the present invention.

Claims (5)

[Claims] (1) The following components (A) and (B):
(C) and (D), wherein the weight ratio of the main components (A) and (B) is (A) / (B) = 50/50 to 95/5,
A composition for a color filter protective film, wherein 0.3 to 5 parts by weight of water is added in an external amount to 100 parts by weight of a composition excluding a solvent and water. (A) Photopolymerizable polyfunctional (meth) acrylate monomer and / or oligomer (B) Non-acrylic epoxy group-containing resin (C) Silane coupling agent (D) Water 2. The composition for a color filter protective film according to claim 1, wherein an epoxy curing agent is further added in a weight ratio of 3 to 90 with respect to 100 of the non-acrylic epoxy group-containing resin. 3. A substrate, a coloring layer formed on the substrate,
A substrate with a color filter having a protective film formed thereon, wherein the protective film is obtained by curing the composition for a color filter protective film according to claim 1 or 2. . 4. A method for producing a substrate with a color filter, comprising forming a colored layer on a substrate and forming a protective film thereon, supplying the composition for a color filter protective film according to claim 1 or 2 onto the colored layer. After that, the composition for a color filter protective film is cured by irradiating light and then heating to produce a substrate with a color filter. 5. A substrate with a color filter according to claim 3 or a substrate with a color filter manufactured by the method for producing a substrate with a color filter according to claim 4 is used as at least one substrate constituting a liquid crystal display element. A liquid crystal display device characterized by the above-mentioned.