JPH10153862A - Photosensitive colored composition for color filter and color filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To develop an excellent photopolymerization initiator and to provide the photosensitive colored composition containing it for the color filter and this color filter by using the photopolymerization initiator comprising a specified compound and an aromatic ketone compound and an amine compound. SOLUTION: This photopolymerization initiator comprises the first component of the compound of the formula and the second component of the aromatic ketone and the third component of the amine compound usually in a proportion of 100 pts.wt. of the first component and 50-500 pts.wt. of the second component and 5-100 pts.wt. of the third component, thus permitting this photosensitive colored composition to be high in sensitivity and good in film hardenability and high in adhesion to a substrate, and further good in the storage stability of the materials, and superior in photosensitive characteristics. The use of carbon black as a pigment permits the obtained photosensitive resin composition for forming the black matrix for the color filter low in reflectance and high in resolution to be obtained at low cost.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photosensitive coloring composition useful for producing a color filter (hereinafter referred to as CF) used for a display for a color liquid crystal or a CCD image sensor, and a method for using the photosensitive coloring composition. About the CF that was.

[0002]

2. Description of the Related Art Conventionally, in a display driven by a liquid crystal, in particular, in order to perform a color display, it is necessary to use C
It goes without saying that F is the most important member. The structure is slightly different depending on the TFT, STN and TN type, but 1) black (Bk) portion for light shielding, 2) red (R), green (G), blue (B) for color display on the glass surface. 3) a transparent film for holding a color matrix, and 4) a transparent electrode film for driving a liquid crystal.

[0003] Various methods have been devised to construct the CF matrix of these layers.
At present, four types, namely, a dyeing method, a pigment dispersion method, a printing method, and an electrodeposition method, have been put into practical use. However, technologies specific to quality performance and cost reduction are being studied in each system.

[0004] Conventionally, the method of forming CF using a pigment is roughly classified into two methods. The first method is to apply a coating obtained by dispersing a pigment in a vehicle such as an acrylic resin with a dispersant or the like to a glass substrate, dry the coating, and then apply and dry a photosensitive resist material (positive resist) thereon. After exposure using a mask, development is performed to form a resist pattern, the colored layer in a portion having no resist pattern is removed by etching, and a colored film pattern is obtained. A color pattern is completed, and this operation is repeated as many times as necessary to form a CF made of RGB.

[0005] A second method is to add a photopolymerization initiator (or a photosensitizer) and a photosensitive resin component to a pigmented coloring composition to make the composition photosensitive, and to prepare the colored photosensitive composition. This is a method of coating, drying, exposing and developing on a substrate to obtain a colored pattern. In this case, the photosensitive agent includes a bis azide compound and a diazo compound, and the photopolymerization initiator includes acetophenone, benzyl dimethyl ketal, and the like. The ultraviolet light is absorbed by the pigment even when the coating layer made of the composition is exposed, and the photosensitivity of the coating layer is low. Therefore, there is a problem that considerable light energy and light irradiation time are required until the coating layer is completely cured.

However, a large number of substances that generate radicals by light have hitherto been found, and their action mechanisms are various. Generally, a two-component photopolymerization initiator is often used. However, a disadvantage in this case is that before the generated radicals work effectively for polymerization, radicals are trapped in the other component used in combination, or the generated radicals are caught (recombined) with each other, and eventually. Often show only the same degree of cure as the single polymerization initiator system. However, if a multi-component initiator can be found, there is an advantage that the material selection range is significantly wider than that of a single-component initiator. However, at present, when the three-component initiator is used as described above, there are few specific examples showing the combined effect.

[0007]

Among them, for example,
J.Potopolymer.Sci.Technol. 1990,2,147. And Makromol.C
hem.1991,192,1307. However, these examples are a combination of ketones, amines, and onium salts, and lack the stability at the time of photopolymerization, and further require light transmittance especially for CF applications, and use glass as a substrate. Therefore, when the above onium salt is used as a photopolymerization initiator, the main working wavelength of the onium salt coincides with the main working wavelength of the glass, so that the photopolymerization is performed by blocking the working light on the substrate. Poor compatibility.

[0008] From such a viewpoint, there is a need for a photopolymerization initiator which has a long radical life and is efficient even though it is a three-component system. In this way, the process is simple when producing CF with high sensitivity, making full use of the ability of the photopolymerization initiator,
There is a need for a technique for producing good CF having excellent light resistance, heat resistance and resolution, and development of a photopolymerization initiator that exhibits a high-efficiency curing action on a photosensitive resin component. Accordingly, an object of the present invention is to provide a photosensitive coloring composition for CF and CF using the photopolymerization initiator, together with the development of the above-mentioned excellent photopolymerization initiator.

[0009]

The above object is achieved by the present invention described below. That is, the present invention provides a coloring agent, a photosensitive resin component containing an organic polymer and a photopolymerizable monomer, a photopolymerization initiator and a photosensitive coloring composition for CF containing a solvent as a main component, wherein the photopolymerization initiator is Is a ternary photopolymerization initiator obtained by combining a compound of the following formula 1 (first component), an aromatic ketone (second component) and an amine compound (third component). And a CF formed from the composition. (Equation 1)

According to the present invention, as the photopolymerization initiator in the photosensitive coloring composition for CF, the tertiary photopolymerization initiator includes: 1) a high quantum efficiency for generating an initiating species (radical or cationic species); 2) The wavelength of the irradiation light source matches the absorption band of the initiator. 3) High thermal stability and no dark reaction. 4) Good compatibility with monomers and polymers. 5) Discoloration and yellowing of the photocured film. And 6) excellent safety and economy. Therefore, even if the coloring agent in the photosensitive coloring composition for CF is a pigment, and the coating layer in which light is absorbed by the pigment, radicals generated from the photopolymerization initiator sufficiently photo-cure the photosensitive component. High sensitivity and C
An F pattern can be formed.

[0011]

Next, the present invention will be described in more detail with reference to preferred embodiments. The present invention is characterized in that a photopolymerization initiator system obtained by combining the first to third components is used as a photopolymerization initiator of the photosensitive coloring composition for CF. The first component is a compound of the following formula 1. (Equation 1)

The aromatic ketones as the second component to be combined with the first component are carbonyl compounds, dicarbonyl compounds, and acetophenone compounds which are well-known photopolymerization initiators. Specifically, as carbonyl compounds, Benzophenone, Photocure81 (sunko), Epacur
e TZT, 2,4,6-trimethylbenzophenone, methyl-O-ben
zoylbenzoate, 4-phenyl benzophennone, 4 (4-methylph
enyl thio) phenylethanone, 3,3'-dimethyl-4-methoxyb
enzophenone, 4- (1,3-acryloyl-1,4,7,10,13-penta oxa
tridecyl) benzophenone, 3,3 ', 4,4'-tetra (t-buthyl pe
(roxycarbonyl) benzophenone, 4-benzoyl-N, N, N-trimeth
yl benzene methanammonium chloride, Kayacure ITX, K
ayacure DETX, Kayacure CTX, Kayacure REDETX, Kayac
ure QTX, Esacure X15, 2-benzoylmethylene-3-methyln
aphthio (1.2-d) thiazoline and the like.

As the dicarbonyl compound, benzi
l, 2-ethyl antraquinone, 9,10-phenanthreneqinone,
methyl-α-oxo benzeneacetate, Trigonal P121 (AKZO)
And the like. Also, as the acetophenone compound,
(Ciba-Geigy) Darocure1173, Darocure1116, Irgacure29
59, Irgacure184, Irgacure500, Darocure4665, Irgacur
e369 and the like.

The following compounds are exemplified as the amine compound as the third component, but the present invention is not limited to the following compounds.

The proportion of the first to third components used is usually 50 to 500 parts by weight of the second component, 5 to 100 parts by weight of the third component, preferably 100 to 100 parts by weight of the first component. 100 parts by weight of the component, 100 to 3 parts of the second component
00 parts by weight, and 10 to 50 parts by weight of the third component.
When the use amount of the second component is too large, the absorption wavelength of the first component or the second component is hindered, and there is a problem of solubility of the second component in a solvent when the composition is prepared. When formed into a coating film, the second component is unsatisfactory in that it recrystallizes and causes surface roughness of the coating film. On the other hand, if the amount of the second component is too small, the amount of radicals generated from the catalyst system is reduced. It is unsatisfactory in that it causes a decrease in the photosensitivity of the composition. On the other hand, if the amount of the third component is too large, an amine odor may be generated from the composition, or the composition may exhibit hot yellowing due to the presence of excess amine reactants dispersed in the composition. On the other hand, if the amount of the third component is too small, hydrogen is not sufficiently extracted from the second component, and radical generation of the catalyst system cannot be performed smoothly. It is unsatisfactory in that the light sensitivity of the object is lowered.

In order that the wavelength distribution of the type of exposure light source for curing the composition can be more widely used, C
When the sensitivity of the photosensitive coloring composition for F is required to be improved, it is preferable to use another sensitizing dye in combination with these sensitizing dyes. As the other sensitizing dye, for example, 5-nitroacenaphtene manufactured by Shinko Giken, 1-
nitropyrene, N-acetyl-4-nitro-1-aminonaphthalene,
N-phenylthioacrydone, S-151, S-161, S-
171, S-181, S-142, S-152, S-1
62, S-172, S-182, NK manufactured by Nippon Kogaku Dyestuffs
-1342, NK-3798, NK-1473, NKX
-846, NKX-1319, NKX-1595, NK
X-653, NKX-1658, NKX-2990, N
KX-3906 and the like. These sensitizing dyes
It is preferable to use 0.1 to 10% by weight based on the photosensitive resin component constituting the photosensitive coloring composition for CF.

Further, a conventionally known photopolymerization initiator may be used in combination with the photopolymerization initiator used in the present invention. For example, a compound which generates free radicals by the energy of ultraviolet light, Benzoin, benzophenone derivatives such as benzophenone, or derivatives thereof such as esters, xanthone and thioxanthone derivatives, chlorosulfonyl and chloromethyl polynuclear aromatic compounds as halogen-containing compounds, chloromethyl heterocyclic compounds, chloromethylbenzophenones, triazines,
There are fluorenones, haloalkanes, redox couples of a photoreducing dye and a reducing agent, organic sulfur compounds, peroxides, and the like, and these can be used alone or in combination of two or more. When used in combination, it is preferable that the absorption spectral characteristics of the tertiary photopolymerization initiator used in the present invention are not alienated.

In order to further improve the photosensitivity of the photosensitive coloring composition for CF, it is preferable to use a styryl compound or a coumarin compound as a sensitizing dye. As 2- (p
-Dimethylaminostyryl) quinoline, 2- (p-diethylaminostyryl) quinoline, 4- (p-dimethylaminostyryl) quinoline, 4- (p-diethylaminostyryl) quinoline, 2- (p-dimethylaminostyryl) -3, 3-3H indole, 2- (p-diethylaminostyryl) -3,3-3H indole, 2- (p-
Dimethylaminostyryl) benzoxazole, 2-
(P-diethylaminostyryl) benzoxazole,
2- (p-dimethylaminostyryl) benzimidazole, 2- (p-diethylaminostyryl) benzimidazole and the like can be mentioned.

The coumarin compounds include 7-diethylamino-4-methylcoumarin, 7-ethylamino-
4-trifluoromethylcoumarin, 4,6-diethylamino-7-ethylaminocoumarin, 3- (2-benzimidazolyl) -7-N, N-diethylaminocoumarin,
7-diethylaminocyclopenta (c) coumarin, 7-
Amino-4-trifluoromethylcoumarin, 1,2,2
3,4,5,3H, 6H, 10H-tetrahydro-8-
Trifluoromethyl (1) benzopyrano- (9,9A,
1-gh) -quinolizin-10-one, 7-ethylamino-6-methyl-4-trifluoromethylcoumarin,
1,2,3,4,5,3H, 6H10H-tetrahydro-9-carbethoxy (1) benzopyrano (9,9a, 1
-Gh) -quinolizin-10-one and the like.

When another photopolymerization initiator or a sensitizing dye is used in combination with the photopolymerization initiator system used in the present invention, the absorption spectral characteristics of the photosensitive coloring composition for CF are not impaired by the combined use. Specific examples of the photopolymerization initiator which does not inhibit the absorption spectral characteristics of the composition include, for example, chloromethylbenzophenone, 9,10-anthraquinone, 2-methyl-9,10-anthraquinone Chlorosulfonylanthraquinone, chloromethylanthraquinone, 9,10-phenanthrenequinone, xanthone,
Chloroxanthone, thioxanthone, chlorothioxanthone, 2,4-diethylthioxanthone and the like can be mentioned.

In the photosensitive coloring composition for CF of the present invention, it is preferable to use a pigment as a coloring agent. As the pigment to be used, any of the known pigments used in conventional CF production may be used. can do. Specifically, for example, as organic pigments, phthalocyanine-based, azo-based, condensed azo-based, anthraquinone-based, perinone-perylene-based, indigo-based, thioindigo-based, isoindolinone-based, azomethine-based, azomethineazo-based, dioxazine-based Quinacridone type, aniline black type, triphenylmethane type, carbon black and the like. Among them, a particularly preferred pigment is C.I.
I. No. 9, C.I. I. No. 97, C.I. I. No. 1
22, C.I. I. No. 123, C.I. I. No. 149,
C. I. No. 168, C.I. I. No. 177, C.I.
I. No. 180, C.I. I. No. 192, C.I. I. N
o. 215 etc. as green (green). I. No.
7, C.I. I. No. 36, as blue (blue): C.I.
I. No. 15, C.I. I. No. 22, C.I. I. No.
60, C.I. I. No. 64 and the like.

Further, a pigment may be used in combination with a plurality of pigments, not alone.
It is necessary to perform spectral correction of the photosensitive coloring composition for use. In this case, a color index (The Society of Dyers and Colou
rists), which are classified as pigments. C. I. Pigment Yellow 24, C.I.
I. Pigment Yellow 31, C.I. I. Pigment yellow 53, C.I. I. Pigment Yellow 8
3, C.I. I. Pigment Orange 43, C.I. I. Pigment Red 105, C.I. I. Pigment Red 149, C.I. I. Pigment Red 176,
C. I. Pigment Red 177, C.I. I. Pigment Violet 14, C.I. I. Pigment Vi
olet 29, C.I. I. Pigment Blue 15, C.I.
I. Pigment Blue 15: 3, C.I. I. Pigment Blue 22, C.I. I. Pigment Blue 28, C.I.
I. Pigment Green 15, C.I. I. Pigment
Green 25, C.I. I. Pigment Green 36,
C. I. Pigment Brown 28, C.I. I. Pigment Black 1, C.I. I. Pigment Black 7 and the like.

Further, in the present invention, these pigments can be used in the form of an aqueous filter cake or an aqueous suspension in addition to a dry fine powder. The pigment used is
It is preferable to carry out a dispersion treatment in advance with a dispersant and / or an organic polymer described below.

The photosensitive coloring composition for CF of the present invention may further contain a pigment dispersant, if necessary. As the dispersant for the pigment, a wide range of dispersants can be appropriately selected and used. For example, a surfactant, an intermediate for a pigment, an intermediate for a dye, solsperse, and the like are used. The composition ratio at the time of dispersion is not particularly limited,
The amount of the pigment added to the organic polymer described below is 50 to 150.
% By weight, and the dispersant is about 1 to 10% by weight of the pigment. However, the dispersant must function to uniformly disperse the pigment used in the photosensitive coloring composition for CF and prevent aggregation of the pigment. Accordingly, the dispersant itself must not inhibit the various physical properties of the CF to be produced, and further, it is necessary to select the CF in consideration of the heat resistance and the yellowing of the CF.

Further, the amount of the organic polymer used in the present invention is
A range of about 3 to 40 parts by weight, preferably about 5 to 30 parts by weight, per 100 parts by weight of pigment is preferred. The organic polymer used in the present invention functions as a developing property of a colored film forming a pixel in an alkaline developer, a film forming material, a viscosity modifier of a photosensitive coloring composition for CF, and a dispersion stabilizer of a pigment. As the organic polymer suitably used for such a purpose, from a wide variety of organic polymers, the pigment dispersibility is good, and the compatibility with the photopolymerizable monomer and the photopolymerization initiator is good. An organic polymer having good alkali developability, solubility in organic solvents, strength, substrate adhesion, softening temperature, and the like is selected.

Specific examples include acrylic resins, polyester resins, unsaturated polyester resins, photosensitive monomers having (meth) acryloyl groups, and oligomers. Furthermore, polymethacrylic acid ester or its partial hydrolyzate, polyvinyl acetate or its hydrolyzate, polyvinyl phenol, phenol novolak, polystyrene, polyvinyl butyral, polychloroprene, polyvinyl chloride, chlorinated polyethylene, chlorinated polypropylene, polyvinyl Pyrrolidone, a copolymer of styrene and maleic anhydride or a half ester thereof, acrylic acid, acrylic acid ester, methacrylic acid, methacrylic acid ester, acrylamide, selected from a group of copolymerizable monomers such as acrylonitrile, the glass transition point is 35
And a copolymer having a temperature of at least ℃.

Among these, particularly preferred polymers are a copolymer of (meth) acrylic acid and (meth) acrylic acid ester, a styrene / maleic anhydride copolymer, and a reaction product of the copolymer and an alcohol. And a tertiary copolymer of acrylic acid, styrene and benzyl (meth) acrylate. The copolymerization ratio of the tertiary copolymer is arbitrary,
For example, when the preferable range is 100 mol in total,
(Meth) acrylic acid about 20-40 mol, styrene about 25
~ 45 mol, and about 10 benzyl (meth) acrylates
５０50 mol of copolymer. The copolymer also has a purpose of stabilizing the pigment in the photosensitive coloring composition together with the above-mentioned dispersant, and its molecular weight is preferably in the range of about 10,000 to 70,000. In order to impart a suitable alkali developability, the acid value is preferably in the range of about 60 to 200 mgKOH / g.

If the copolymerization ratio and acid value of the tertiary copolymer are not well-balanced, the pattern is resolved after the exposure and development of the coating layer comprising the photosensitive coloring composition for CF, but the alkali developing Intense study is made that small wrinkles and cracks occur on the resolution pattern surface due to lack of resistance to the solution, and the rapid penetration of the alkali developing solution from this will eventually cause the colored layer to peel from the glass substrate surface I understood the result.

The polyfunctional (meth) acrylate monomer which is an example of a photopolymerizable monomer used as a photosensitive resin component of the photosensitive coloring composition for CF of the present invention is a CF of the present invention.
The main component of the photosensitive coloring composition for, for example,
Ethylene glycol (meth) acrylate, diethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, dipropylene glycol di (meth) acrylate, polyethylene glycol di (meth) acrylate, polypropylene glycol di (meth) acrylate, hexane di (meth) ) Acrylate, neopentyl glycol di (meth) acrylate,
Glycerin di (meth) acrylate, glycerin tri (meth) acrylate, glycerin tetra (meth) acrylate, tetratrimethylolpropane tri (meth)
Acrylate, dipentaerythritol hexa (meth)
Acrylates and the like can be mentioned, and these components are used alone or as a mixture.

It is preferable that these polyfunctional (meth) acrylate monomers contain at least one kind of trifunctional or higher-functional monomer, and the content thereof is about 30 to 95% by weight of the polyfunctional (meth) acrylate monomer. It is. In addition, these polyfunctional (meth) acrylate monomers include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, butyl (meth) acrylate, pentyl (meth) acrylate, ethylhexyl ( Monofunctional monomers such as (meth) acrylate, styrene, methylstyrene and N-vinylpyrrolidone can be added.

Specific examples of the solvent used in the present invention include alcohol solvents such as methyl alcohol, ethyl alcohol, n-propyl alcohol, and i-propyl alcohol; cellosolve solvents such as methoxy alcohol and ethoxy alcohol; Ethoxyethanol, carbitol solvents such as ethoxyethoxyethanol, ethyl acetate, butyl acetate, methyl methoxypropionate,
Ethyl solvents such as ethyl ethoxypropionate and ethyl lactate; ketone solvents such as acetone, methyl isobutyl ketone and cyclohexanone; cellosolve acetate solvents such as methoxyethyl acetate, ethoxyethyl acetate, ethyl cellosolve acetate, methoxyethoxyethyl acetate, ethoxy Carbitol acetate solvents such as ethoxyethyl acetate, ether solvents such as diethyl ether, ethylene glycol dimethyl ether, diethylene glycol dimethyl ether, tetrahydrofuran, N, N-dimethylformamide;
Aprotic amide solvents such as N, N-dimethylacetamide and N-methylpyrrolidone; lactone solvents such as γ-butyrolactone; unsaturated hydrocarbon solvents such as benzene, toluene, xylene and naphthalene; n-heptane;
Organic solvents such as saturated hydrocarbon solvents such as hexane and n-octane are exemplified.

Of these solvents, cellosolve acetate solvents such as methoxyethyl acetate, ethoxyethyl acetate and ethyl cellosolve acetate; carbitol acetate solvents such as methoxyethoxyethyl acetate, ethoxyethoxyethyl acetate; ethylene glycol dimethyl ether; diethylene glycol dimethyl ether , Ether solvents such as propylene glycol diethyl ether, methyl methoxypropionate,
Ester solvents such as ethyl ethoxypropionate and ethyl lactate are preferred.

In the photosensitive coloring composition for CF of the present invention, the proportion of the pigment in the composition is about 40 to 75% by weight of the solid content of the composition, preferably about 45 to 70% by weight.
% By weight. If the amount of the pigment is less than about 40% by weight, the coloring power of each colored film (pixel) is insufficient, and it is difficult to display a clear image. On the other hand, when the amount of the pigment exceeds about 75% by weight, the light transmittance of each colored film becomes insufficient. Since various optical properties such as coloring power and translucency vary depending on the type, particle size, dispersion state, and the like of the pigment, R, G, B, and B
The amount to be used is determined according to the physical properties of the specific pigment selected as k. The criterion for determining the amount used is such that the light transmittance of the formed colored film is about 80 to 90%. However, in the case of Bk, translucency is not required.

The light transmittance of each colored film is measured by placing a measurement sample between two polarizing plates and determining the luminance when the polarization axis is parallel and when the polarization axis is vertical. The measurement wavelength of the light beam is 61 for the R part.
The measurement was performed at 0 nm, the part G was 540 nm, and the part B was 450 nm. Further, with respect to Bk, O.D. D. It was measured as a value. The thickness of the CF sample was about 1.5 μm.

The amount of the polyfunctional (meth) acrylate monomer constituting the photosensitive coloring composition for CF of the present invention is about 20 to 60% by weight in the film forming composition other than the pigment.
, Preferably about 30-50% by weight. When the amount of the polyfunctional (meth) acrylate monomer is less than about 20% by weight, various physical strengths such as the adhesive strength and heat resistance of the formed colored film are insufficient. If the content exceeds about 60% by weight, the stability of the photosensitive coloring composition for CF decreases, and the flexibility of the formed colored film becomes insufficient.

Further, in order to improve the dissolving property of the photosensitive coloring composition for CF in a developing solution, the above ratio is necessary. If the ratio is out of this range, the pattern is resolved, but the monomer curing speed is high. Scum and whiskers occur around the colored pattern. In addition, the same phenomenon occurs if the ratio between the organic polymer and the monomer is not optimized,
As a result of various studies, it has been found that in extreme cases, re-adhesion of the colored film caused by partial swelling and peeling occurs, which hinders accurate pattern formation of the colored film.

The amount of the organic polymer constituting the photosensitive coloring composition for CF of the present invention is a proportion occupying about 5 to 80% by weight, preferably about 10% by weight, of the film-forming composition other than the pigment.占 め る 60% by weight. When the amount of the organic polymer is less than about 5% by weight, the applicability of the photosensitive coloring composition for CF to a substrate is reduced, and the developability of the formed colored film in an alkali developing solution is insufficient. When the adhesion strength and flexibility of the colored film to be formed are insufficient, on the other hand, when the organic polymer exceeds about 80% by weight, the film loss of the colored film after post-baking increases, In some cases, the film hardness becomes insufficient due to an increase in the uncured amount, and the film hardness becomes insufficient.

The amount of the photopolymerization initiator constituting the photosensitive coloring composition for CF of the present invention is a proportion occupying about 5 to 35% by weight in the film-forming composition other than the pigment, and preferably about 5 to 35% by weight. It is a ratio occupying 10 to 30% by weight. When the amount of the photopolymerization initiator is less than about 5% by weight, the sensitivity of the photosensitive coloring composition for CF decreases, and the adhesion and flexibility of the formed colored film become insufficient. There is.

The photopolymerization initiator may be added from the beginning to the resin composition comprising the polyfunctional (meth) acrylate monomer and the organic polymer in which the pigment is sufficiently dispersed. When the composition is stored for a relatively long period, it is preferable to disperse or dissolve the photopolymerization initiator in the resin composition immediately before use. The photosensitive coloring composition for CF according to the present invention contains the above-mentioned components as essential components. However, various organic solvents are used for the purpose of adjusting the applicability, sensitivity, cross-link density and the like of the photosensitive coloring composition for CF. Additives known in the art such as various polymers, sensitizers, and chain transfer agents can be added as needed.

The photosensitive coloring composition for CF of the present invention is prepared by mixing each of the above-mentioned components and an appropriate organic solvent, for example, by dispersing with a paint shaker, a bead mill, a sand grind mill, a ball mill, an attritor mill, a two-roll mill or the like. It is obtained by dispersing using a machine. Obtained CF
The photosensitive coloring composition for use is in the form of a coating liquid or ink in which an organic solvent is used as a medium, and may be diluted with an organic solvent immediately before use, if necessary.

Further, at this time, anionic pigment dispersants such as polycarboxylic acid type polymer activators, polysulfonic acid type polymer activators, and nonionic pigment dispersants such as polyoxyethylene / polyoxypropylene block polymers are dispersed. Agents, anthraquinone-based, perylene-based, phthalocyanine-based, quinacridone-based organic dyes such as amino groups, carboxyl groups, sulfonic acid groups, carboxylic acid amide groups, and the like, when a derivative of an organic dye having a substituent introduced therein is added,
This is preferable because the dispersibility and dispersion stability of the pigment are improved. These pigment dispersants and organic dye derivatives are preferably used in an amount of 50 parts by weight or less based on 100 parts by weight of the pigment.

Using the above-described photosensitive coloring composition for CF, C
The method of forming the pattern of F may be a conventionally known method. For example, the photosensitive coloring composition of R, G, B and Bk is spin-coated on a transparent substrate in an appropriate order, a low-speed rotation coater or a roll coater. Or a full coat using a knife coater, etc., or a full print by various printing methods or a partial print slightly larger than the pattern, and after pre-drying, closely contact the photomask, ultra-high pressure mercury lamp, high pressure mercury lamp, metal halide lamp, Deep ultraviolet light,
The pattern is printed by exposing and curing using a light source such as a visible light laser.

Next, the coating film irradiated with the light is applied to an aqueous alkali solution (an aqueous solution of a base such as an alkali metal carbonate such as sodium carbonate, an alkali metal hydroxide such as sodium hydroxide, or an organic alkali such as tetramethylammonium hydroxide). , Organic solvents (organic halides such as trichloroethylene, perchloroethylene, and methylene chloride; ketones such as methyl isobutyl ketone and cyclohexanone; and esters such as ethyl cellosolve acetate)
Develop and wash in running or shower water to dissolve uncured portions. Repeat this process for each color. By performing post-baking as necessary, a CF pattern can be formed.

[0044]

Next, the present invention will be described more specifically with reference to examples. Example 1 As a transparent substrate, a low expansion glass (manufactured by Corning Incorporated) washed with a neutral detergent, washed with water, degreased, ozone and light washed was used. The following were used as the blue pigment dispersion.・ C. I. Pigment Blue 15 + C.I. I. Pigment Violet 23 10.0 g ・ Benzyl methacrylate-styrene-acrylic acid copolymer 3.0 g (copolymerization ratio 1: 1: 1, molecular weight about 30,000 (molecular weight distribution Mw / Mn = 1.7)) ・ Dispersant Disperbyk161 (manufactured by BYK-Chemie) 1.0 g ・ Polyethylene glycol monomethylethyl acetate (PGMEA) 70.0 g
A dilution solvent was added, and the mixture was dispersed with a paint shaker, a bead mill or the like to obtain a pigment dispersion.

• Pigment dispersion liquid (blue) 84.0 g • Benzyl methacrylate-styrene-acrylic acid copolymer 5.0 g (copolymerization ratio 1: 1: 1, molecular weight about 30,000 (molecular weight distribution Mw / Mn = 1) .7)) Solid content 40% (3-methoxybutyl acetate solution))-Trimethylolpropane triacrylate (Nippon Kayaku) 7.0 g-DPHA (dipentaerythritol hexaacrylate, Nippon Kayaku) 2.0 g- BZQ (Formula 1, manufactured by Aldrich) + Irgacure 369 (2-hydroxy-2-methyl-1-phenylpropan-1-one, manufactured by Ciba Geigy) + 2,2- (methylamino) diethanol (Aldrich, 2) -Abbreviation for MDEA): Mixing ratio 0.5: 1: 0.1 (weight ratio) 3.0 g ・ Ethyl cellosolve acetate 40.0 g The components were mixed by mixing and dispersed with a paint shaker and a bead mill to obtain a photosensitive coloring composition for CF of the present invention.

The pigment dispersed particle diameter in the above-mentioned photosensitive coloring composition for CF should be 0.5 μm or less in d ₅₀ (d ₅₀ represents a dispersed particle diameter showing a 50% average distribution of the whole particle size distribution width). Dispersed. Check the particle size and particle size distribution by Nikkiso Co., Ltd.
The measurement was performed using a Microtrac UPA particle size analyzer manufactured by KK. Further, only the pigment was changed as described below, and the others were the same as in the above, and the C, R, G, B and Bk colors of the present invention were used.
A photosensitive coloring composition for F was obtained.

(Pigments used)

The photosensitive coloring composition for CF was applied to a glass substrate to a thickness of 1.0 μm by spin coating. The film thickness was measured with a deck tack device using a stylus method. After applying the photosensitive coloring composition for CF, pre-baking is performed at about 100 ° C. for 3 minutes in a CR dryer, and subsequently, from 50 to 1,000 mJ / cm ² by an aligner through a mask having a fine line pattern. The pixel pattern was printed by changing the exposure amount. The measurement of light energy was performed using a thin ultraviolet light meter made by Ushio.

In the development, an unexposed film was dissolved in a 0.1% by weight aqueous solution of KOH (developer temperature: 23 to 25 ° C.) using an automatic developing apparatus, and then washed with water. The development showed a uniform dissolution type (the same applies to the photosensitive coloring composition for CF of each color of R, G, B and Bk). Further, the dissolution rate of this unexposed film was 110 mg per minute per minute in 1 liter of developer under the conditions of the present developer. After confirming the pattern fine line with a microscope, post-baking was performed at 200 ° C for 60 hours.
Minutes. This operation was performed for each of RGB and Bk. About 100m sensitivity for R, G and B colors
J / cm ² or less and about 230 mJ / cm ² for Bk
Met. Regarding the light sensitivity, the optical density is increased by 0.15 for each step with the optical density of 0.05 as the first step.
Evaluation was performed using a one-step tablet. The formed pattern thin line has no scum etc. and the edge shape is normal,
The line-and-space pattern was resolved at 1.0 μm for red, 1.5 μm for green, 1.2 μm for blue, and 2.5 μm or less for black. Furthermore, the film loss rate after post-baking is 10%.
It was confirmed that:

Example 2 (Comparison of Sensitivity) (Study on Optimization of Initiator Chemical Species) Only the chemical species of the photopolymerization initiator of Example 1 was changed. Otherwise, a CF was formed in the same manner as in Example 1, and evaluation was performed in the same manner. In the evaluation, the development characteristics were particularly emphasized, and the substrate adhesion, which also affects the apparent sensitivity, was also evaluated. The results are shown in the following Table 1 (unless otherwise specified, the results are for the B pigment dispersion). Regarding the substrate adhesion, the measured cured film was cut into a square of 100 mm square using a cutter or the like.
For the individual, in the test by cellophane adhesive peeling, ８５, 85 or more than the number of squares remaining on the substrate surface without peeling
75 or more was evaluated as 、, 60 or more as Δ, and less than 60 as ×. Regarding the surface roughness of the colored cured film, when the pixels after development were reflected and observed by a microscope equipped with a polarizing filter, x was given when whitening due to visual field confusion or the like was observed, and o was given when no surface scattering was observed.

Table 1-1 The abbreviations in the above table have the following meanings. (Ratio) ··· comparative example (actual) ··· example Irgaguer (I-) 184 ··· 1-hydroxy-cyclohexylphenyl-ketone, manufactured by Ciba-Geigy I-369 ··· 2-benzyl-2-dimethylamino −
1- (4-morpholino-phenyl) butanone-1, TAZ-110... CAS No. [42573-5
7-9], Midori Chemical's Michler's ketone: trade name S-112, Shinko Giken's 2-MDEA: 2,2 '-(methylamino) diethanol

Table 1-2

[0053] The pattern thin line had no scum or the like and the edge shape was normal, and each color was resolved as follows. Red is 0.8 μm (colored film dissolution rate 110 mg), green is 1.2 μm (colored film dissolution rate 120 mg, sensitivity is about 80 mJ / cm ² ), and blue is 1. 1 μm (colored film dissolution rate 100 mg, sensitivity about 80 m
J / cm ² ) or less, the line and space pattern was resolved. Furthermore, the film loss rate after post-baking is 10%.
It was confirmed that:

In the system using Bk, the light-shielding property was absolutely high and the sensitivity was lowered, but the sensitivity was improved by the combined use of a photosensitizer. In this case, it was confirmed that addition of 0.1 to 0.3% by weight of an acridine dye, an anthracene dye, a coumarin dye or an amine as a sensitizing dye further has a photopolymerization promoting effect.

[0055]

As described above, according to the present invention,
The photosensitive coloring composition for CF of the present invention has high sensitivity, good film curability, and high substrate adhesion. Further, the storage stability of the material is good, and the material has good photosensitive characteristics. When the pigment is carbon black, a photosensitive resin composition for forming a black matrix for CF, which is low in cost and has low reflectance and high resolution, can be obtained. Furthermore, CF can be produced by applying the photolithography method. By using the CF, a liquid crystal color display having higher quality and higher durability can be obtained.

Further, the colored film made of the photosensitive coloring composition for CF of the present invention is formed into a colored pattern by a solution development type in a dilute aqueous alkali developing solution of about 0.1%, and the developed pattern in the developing step is formed. This is a photosensitive coloring composition for CF, which enables control of the removal time and enables highly reliable CF processing.

Claims (8)

[Claims] 1. A photosensitive color composition for a color filter comprising a colorant, a photosensitive resin component containing an organic polymer and a photopolymerizable monomer, a photopolymerization initiator and a solvent as main components. Is a ternary photopolymerization initiator obtained by combining a compound represented by the following formula 1, an aromatic ketone, and an amine compound. (Equation 1) 2. The compound of the formula 1, the aromatic ketone and the amine compound are used in an amount of 50 to 500 parts by weight of the aromatic ketone and 5 to 100 parts by weight of the amine compound per 100 parts by weight of the compound of the formula 1. The photosensitive coloring composition for a color filter according to claim 1, which is: 3. The photosensitive coloring composition for a color filter according to claim 1, further comprising a sensitizing dye. 4. The photosensitive coloring composition for a color filter according to claim 3, wherein the sensitizing dye is at least one selected from a coumarin compound and a styryl compound. 5. The photosensitive coloring composition for a color filter according to claim 1, further comprising a dispersant. 6. A photopolymerizable monomer comprising at least one kind of 3
The photosensitive coloring composition for a color filter according to claim 1, further comprising a functional or higher acrylate monomer. 7. An organic polymer comprising (meth) acrylic acid in an amount of 20 to 40% by weight of all monomers and an acid value of 60 to 2%.
The photosensitive coloring composition for a color filter according to claim 1, which is an acrylic acid-based copolymer of 00 mgKOH / g. 8. A color filter formed from the photosensitive coloring composition for a color filter according to claim 1.