JP2010134419A - Radiation-sensitive composition for colored layer formation, color filter and color liquid crystal display element - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radiation-sensitive composition for colored layer formation which enables formation of pixels with a high contrast ratio and excels also in storage stability. <P>SOLUTION: The radiation-sensitive composition for colored layer formation includes (A) a colorant, (B) a dispersant, (C) an alkali-soluble resin, (D) a polyfunctional monomer, (E) a photopolymerization initiator, and (F) a solvent, wherein the composition includes a copolymer having a repeating unit represented by formula (1), a repeating unit represented by formula (2) and a repeating unit represented by formula (3) as the dispersant (B). <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a radiation-sensitive composition for forming a colored layer, a color filter, and a color liquid crystal display element. More specifically, the present invention relates to a transmissive or reflective color liquid crystal display device, a color image pickup tube element, an organic EL display element, an electronic A radiation-sensitive composition used for forming a colored layer useful for a color filter used for paper or the like, a color filter including a colored layer formed using the radiation-sensitive composition, and a color including the color filter The present invention relates to a liquid crystal display element.

  As a method for forming a color filter using a colored radiation-sensitive composition, a coating film of a colored radiation-sensitive composition is formed on a substrate or a substrate on which a light-shielding layer having a desired pattern has been previously formed. A method of obtaining pixels of each color by irradiating radiation through a photomask having a pattern (hereinafter referred to as “exposure”), developing and dissolving and removing unexposed portions, and then post-baking (Patent Document 1) Patent Document 2) is known.

A liquid crystal display device having such a color filter is required to have a high contrast, and as a result, the pigment contained in the colored radiation-sensitive composition tends to become finer. It is known that it is effective to use a dispersant to stably disperse the atomized pigment. In Patent Document 3 and Patent Document 4, it is proposed to use a dispersant composed of a block having a quaternary ammonium base and a block not having a quaternary ammonium base in order to improve the dispersion stability of the pigment. . However, even with such a dispersant, it has been difficult to realize the recent demand for higher contrast. That is, in order to stably disperse the finely divided pigment, a large amount of dispersant must be used, and as a result, development with an alkali developer becomes difficult, and conversely, if the amount of dispersant used is reduced, sufficient There is a problem that a high contrast ratio cannot be obtained, and the storage stability of the colored radiation-sensitive composition is deteriorated.
From the background as described above, there is a strong demand for the development of a radiation-sensitive composition that can form pixels with a high contrast ratio and is excellent in storage stability.

JP-A-2-144502 JP-A-3-53201 JP 2004-182787 A JP 2004-287366 A

The objective of this invention is providing the radiation sensitive composition for colored layer formation which can form a pixel with high contrast ratio, and was excellent also in storage stability.
Furthermore, the objective of this invention is providing the color filter which comprises the colored layer formed from the said radiation sensitive composition, and the color liquid crystal display element which comprises the said color filter.

  In view of such circumstances, the present inventors have conducted extensive research and found that the above problems can be solved by using a dispersant having a specific structure, and have completed the present invention.

That is, the present invention contains (A) a colorant, (B) a dispersant, (C) an alkali-soluble resin, (D) a polyfunctional monomer, (E) a photopolymerization initiator, and (F) a solvent. A radiation-sensitive composition for forming a colored layer comprising:
As the dispersant (B), a copolymer having a repeating unit represented by the following formula (1), a repeating unit represented by the following formula (2), and a repeating unit represented by the following formula (3) (hereinafter referred to as “dispersing agent”) And a radiation-sensitive composition for forming a colored layer, which is characterized by containing a "specific dispersant".
Here, “radiation” as used in the present invention means those including visible light, ultraviolet light, far ultraviolet light, electron beam, X-ray and the like.

Further, the present invention is a colorant dispersion containing a colorant, a dispersant and a solvent,
As the dispersant, a copolymer having a repeating unit represented by the following formula (1), a repeating unit represented by the following formula (2) and a repeating unit represented by the following formula (3) is contained. A colorant dispersion characterized by the above is provided.

(In the formula ^(1), R 1 ~R ³ are independently of each other hydrogen atom, or have a substituent group which may chain or cyclic a hydrocarbon group, among R ¹ to R ³ Two or more may be bonded to each other to form a cyclic structure, R ⁴ represents a hydrogen atom or a methyl group, X represents a divalent linking group, and Y ⁻ represents a counter anion.)

(In the formula (2), R ⁵ and R ⁶ each independently represent a hydrogen atom or a chain or cyclic hydrocarbon group which may have a substituent, and R ⁵ and R ⁶ are And may be bonded to form a cyclic structure, R ⁷ represents a hydrogen atom or a methyl group, and Z represents a divalent linking group.)

(In the formula (3), R ⁸ represents a chain or cyclic alkyl group which may have a substituent, an aryl group which may have a substituent, or an aralkyl which may have a substituent. And R ⁹ represents a hydrogen atom or a methyl group.)

  The present invention also provides a color filter comprising a colored layer formed using the radiation-sensitive composition for forming a colored layer, and a color liquid crystal display device comprising the color filter.

The radiation-sensitive composition of the present invention can form pixels with a high contrast ratio, and is excellent in storage stability.
The color filter of the present invention is extremely useful for, for example, a transmissive or reflective color liquid crystal display device, a color imaging tube element, a color sensor, an organic EL display element, and electronic paper.

Hereinafter, the present invention will be described in detail.
Radiation-sensitive composition for forming colored layer The “colored layer” in the radiation-sensitive composition for forming a colored layer of the present invention (hereinafter sometimes simply referred to as “radiation-sensitive composition”) is used for a color filter. Means a layer composed of pixels and / or black matrix.
Hereafter, the structural component of the radiation sensitive composition for colored layer formation of this invention is demonstrated.

-(A) Colorant-
The (A) colorant in the present invention is not particularly limited as long as it has colorability, and colors and materials can be appropriately selected according to the use of a color filter or the like. Specifically, any of pigments, dyes, and natural pigments can be used as the colorant, but organic pigments and inorganic pigments are preferred because color filters are required to have heat resistance.
Examples of the organic pigment include compounds classified as pigments in the color index (CI; issued by The Society of Dyers and Colorists), specifically, the following color index (CI). Names can be mentioned.

C. I. Pigment yellow 12, C.I. I. Pigment yellow 13, C.I. I. Pigment yellow 14, C.I. I. Pigment yellow 17, C.I. I. Pigment yellow 20, C.I. I. Pigment yellow 24, C.I. I. Pigment yellow 31, C.I. I. Pigment yellow 55, C.I. I. Pigment yellow 83, C.I. I. Pigment yellow 93, C.I. I. Pigment yellow 109, C.I. I. Pigment yellow 110, C.I. I. Pigment yellow 138, C.I. I. Pigment yellow 139, C.I. I. Pigment yellow 150, C.I. I. Pigment yellow 153, C.I. I. Pigment yellow 154, C.I. I. Pigment yellow 155, C.I. I. Pigment yellow 166, C.I. I. Pigment yellow 168, C.I. I. Pigment yellow 180, C.I. I. Pigment yellow 211;

C. I. Pigment orange 5, C.I. I. Pigment orange 13, C.I. I. Pigment orange 14, C.I. I. Pigment orange 24, C.I. I. Pigment orange 34, C.I. I. Pigment orange 36, C.I. I. Pigment orange 38, C.I. I. Pigment orange 40, C.I. I. Pigment orange 43, C.I. I. Pigment orange 46, C.I. I. Pigment orange 49, C.I. I. Pigment orange 61, C.I. I. Pigment orange 64, C.I. I. Pigment orange 68, C.I. I. Pigment orange 70, C.I. I. Pigment orange 71, C.I. I. Pigment orange 72, C.I. I. Pigment orange 73, C.I. I. Pigment orange 74;

C. I. Pigment red 1, C.I. I. Pigment red 2, C.I. I. Pigment red 5, C.I. I. Pigment red 17, C.I. I. Pigment red 31, C.I. I. Pigment red 32, C.I. I. Pigment red 41, C.I. I. Pigment red 122, C.I. I. Pigment red 123, C.I. I. Pigment red 144, C.I. I. Pigment red 149, C.I. I. Pigment red 166, C.I. I. Pigment red 168, C.I. I. Pigment red 170, C.I. I. Pigment red 171, C.I. I. Pigment red 175, C.I. I. Pigment red 176, C.I. I. Pigment red 177, C.I. I. Pigment red 178, C.I. I. Pigment red 179, C.I. I. Pigment red 180, C.I. I. Pigment red 185, C.I. I. Pigment red 187, C.I. I. Pigment red 202, C.I. I. Pigment red 206, C.I. I. Pigment red 207, C.I. I. Pigment red 209, C.I. I. Pigment red 214, C.I. I. Pigment red 220, C.I. I. Pigment red 221, C.I. I. Pigment red 224, C.I. I. Pigment red 242, C.I. I. Pigment red 243, C.I. I. Pigment red 254, C.I. I. Pigment red 255, C.I. I. Pigment red 262, C.I. I. Pigment red 264, C.I. I. Pigment red 272;

C. I. Pigment violet 1, C.I. I. Pigment violet 19, C.I. I. Pigment violet 23, C.I. I. Pigment violet 29, C.I. I. Pigment violet 32, C.I. I. Pigment violet 36, C.I. I. Pigment violet 38;
C. I. Pigment blue 15, C.I. I. Pigment blue 15: 3, C.I. I. Pigment blue 15: 4, C.I. I. Pigment blue 15: 6, C.I. I. Pigment blue 60, C.I. I. Pigment blue 80;
C. I. Pigment green 7, C.I. I. Pigment green 36, C.I. I. Pigment green 58;
C. I. Pigment brown 23, C.I. I. Pigment brown 25;
C. I. Pigment black 1, C.I. I. Pigment Black 7.

  In the present invention, the organic pigment can be purified and used by a recrystallization method, a reprecipitation method, a solvent washing method, a sublimation method, a vacuum heating method, or a combination thereof.

  Examples of the inorganic pigment include, for example, titanium oxide, barium sulfate, calcium carbonate, zinc white, lead sulfate, yellow lead, zinc yellow, red bean curd (red iron oxide (III)), cadmium red, ultramarine blue, bitumen, and chromium oxide. Examples include green, cobalt green, amber, titanium black, synthetic iron black, and carbon black.

These colorants may be used by modifying the particle surface with a polymer, if desired. Examples of the polymer that modifies the particle surface of the pigment include the polymers described in JP-A-8-259876, various commercially available polymers or oligomers for dispersing pigments, and the like. As the polymer coating method on the carbon black surface, for example, methods described in JP-A-9-71733, JP-A-9-95625, JP-A-9-124969, and the like can be employed.
The colorants can be used alone or in admixture of two or more.

When the radiation-sensitive composition of the present invention is used for the formation of a pixel, since the pixel is required to have a high-definition color, (A) the colorant is preferably a colorant with high color developability. Organic pigments are preferably used.
On the other hand, when the radiation-sensitive composition of the present invention is used for forming a black matrix, since the black matrix is required to have a light-shielding property, an organic pigment or carbon black is preferably used as the colorant (A).

  In the present invention, the content of (A) the colorant is a radiation-sensitive composition from the viewpoint of forming a pixel having excellent transparency and color purity, or a black matrix having excellent light-shielding properties, and securing developability. The total solid content is preferably 5 to 70% by mass, more preferably 5 to 60% by mass. Here, solid content is components other than the solvent mentioned later. In addition, the radiation-sensitive composition of the present invention is excellent in storage stability even when the content of the colorant is 30% by mass or more in the total solid content of the radiation-sensitive composition.

-(B) Dispersant-
The dispersant (B) used in the radiation-sensitive composition of the present invention is a specific dispersant, that is, a repeating unit having a quaternary ammonium base represented by the above formula (1) (hereinafter referred to as “repeating unit (1)”). A repeating unit having an amino group represented by the above formula (2) (hereinafter sometimes referred to as “repeating unit (2)”), and a meta unit represented by the above formula (3) (meta ) It contains a copolymer having a repeating unit derived from an acrylate monomer (hereinafter sometimes referred to as “repeat unit (3)”). In the present specification, “(meth) acryl”, “(meth) acrylate” and the like mean “acryl or methacryl”, “acrylate or methacrylate” and the like, for example, “(meth) acrylic acid” It shall mean “acrylic acid or methacrylic acid”.

As R < ¹ > -R < ³ > in the said Formula (1), the C1-C4 alkyl group which may have a substituent, and the C7-C16 aralkyl group which may have a substituent are mentioned. More preferred are methyl group, ethyl group, propyl group, butyl group and benzyl group.
Moreover, as R < ⁵ > and R < ⁶ > in the said Formula (2), the C1-C4 alkyl group which may have a substituent is more preferable, and a methyl group, an ethyl group, a propyl group, and a butyl group are especially preferable. preferable.

Of the substituents on the hydrocarbon group represented by R ^{1 to} R ^{3 in} the above formula (1) and R ^{5 to} R ⁶ in the above formula (2), the substituent on the chain hydrocarbon group includes halogen An atom, an alkoxy group, a benzoyl group, a hydroxyl group, etc. are mentioned. Examples of the substituent on the cyclic hydrocarbon group include a chain alkyl group, a halogen atom, an alkoxy group, and a hydroxyl group. The chain hydrocarbon groups represented by R ^{1 to} R ⁶ include both straight and branched chains.

In the above formula (1), examples of the cyclic structure formed by bonding two or more of R ^{1 to} R ³ to each other include, for example, a 5- to 7-membered nitrogen-containing heterocyclic monocycle or two of these condensed. The condensed ring is mentioned. The nitrogen-containing heterocycle preferably has no aromaticity, more preferably a saturated ring. Specific examples include the following.

(In the formula (I), R is any one of R ^{1 to} R ^3. )
These cyclic structures may further have a substituent.

In the above formula (2), examples of the cyclic structure in which R ⁵ and R ⁶ are bonded to each other include a 5- to 7-membered nitrogen-containing heterocyclic monocycle or a condensed ring formed by condensing two of these. It is done. The nitrogen-containing heterocycle preferably has no aromaticity, more preferably a saturated ring. Specific examples include the following.

  These cyclic structures may further have a substituent.

In the above formulas (1) and (2), examples of the divalent linking groups X and Z include, for example, a methylene group, an alkylene group having 2 to 10 carbon atoms, an arylene group, a —CONH—R ¹³ — group, —COO—. R ¹⁴ -group (where R ¹³ and R ¹⁴ are a single bond, a methylene group, an alkylene group having 2 to 10 carbon atoms, or an ether group (alkyloxyalkyl group) having 2 to 10 carbon atoms). And preferably a —COO—R ¹⁴ — group. In the above formula (1), Y ⁻ of the counter anion includes Cl ⁻ , Br ⁻ , I ⁻ , ClO ₄ ⁻ , BF ₄ ⁻ , CH ₃ COO ⁻ , PF ₆ ^{− and the} like.

The R ⁸ in the formula (3), chain alkyl group having 1 to 8 carbon atoms, an aryl group having 6 to 14 carbon atoms, an aralkyl group 7-16 carbon atoms preferably a methyl group, an ethyl group, a propyl Group, butyl group, 2-ethylhexyl group, phenyl group, benzyl group and phenylethyl group are particularly preferred.
Examples of the substituent on the alkyl group represented by R ⁸ include a halogen atom and an alkoxy group. Examples of the substituent on the aryl group or aralkyl group include a chain alkyl group, a halogen atom, and an alkoxy group. The linear alkyl group represented by R ⁸ includes both linear and branched chains.

  The specific dispersant may further have a repeating unit derived from a (meth) acrylic acid ester monomer represented by the following formula (4) (hereinafter sometimes referred to as “repeating unit (4)”). preferable. Such a repeating unit is considered to enhance the compatibility of the specific dispersant with a binder component such as a solvent and further improve the dispersion stability of the colorant.

(In the formula (4), R ¹⁰ represents an ethylene or propylene group, R ¹¹ represents an alkyl group having 1 to 5 carbon atoms, R ¹² represents a hydrogen atom or a methyl group, n represents an integer from 1 to 20 Is shown.)

R ¹¹ in the above formula (4) is preferably a methyl group, an ethyl group, a propyl group, or a butyl group. N is preferably 1 to 10, and more preferably 1 to 5.

  The specific dispersant may have a repeating unit other than the repeating unit (1), the repeating unit (2), the repeating unit (3), and the repeating unit (4). Examples of such repeating units include styrene monomers such as styrene and α-methylstyrene; (meth) acrylate monomers such as (meth) acrylic acid chloride; (meth) acrylamide, N- (Meth) acrylamide monomers such as methylolacrylamide; vinyl acetate; acrylonitrile; allyl glycidyl ether, crotonic acid glycidyl ether; and repeating units derived from monomers such as N-methacryloylmorpholine.

  In the specific dispersant, the copolymerization ratio of the repeating unit (1) is preferably 10 to 60% by mass, more preferably 20 to 50% by mass in all the repeating units. The copolymerization ratio of the repeating unit (2) is preferably 1 to 30% by mass and more preferably 2 to 20% by mass in all the repeating units. The copolymerization ratio of the repeating unit (3) is preferably 30 to 80% by mass and more preferably 40 to 70% by mass in all the repeating units. The copolymerization ratio of the repeating unit (4) is preferably 1 to 30% by mass and more preferably 2 to 20% by mass in all the repeating units. By copolymerizing each repeating unit at such a ratio, a colored composition having excellent dispersibility can be obtained.

  The specific dispersant is not particularly limited as long as it has the repeating unit (1) to the repeating unit (3), but has a repeating unit (1) and a repeating unit (2) from the viewpoint of further improving dispersibility. It is preferable that it is a block copolymer which has A block and B block which does not have a repeating unit (1) and a repeating unit (2) but has a repeating unit (3). The block copolymer is preferably an AB block copolymer or a BAB block copolymer. By introducing not only a quaternary ammonium base but also an amino group into the A block, surprisingly, the dispersing ability of the dispersant is significantly improved. Moreover, it is preferable that B block has a repeating unit (4) further.

  In the A block, the repeating unit (1) and the repeating unit (2) may be contained in any form of random copolymerization and block copolymerization. In addition, the repeating unit (1) and the repeating unit (2) may be contained in two or more kinds in one A block. In that case, each repeating unit is randomly copolymerized in the A block. It may be contained in any form of block copolymerization. The copolymerization ratio of repeating unit (1) / repeating unit (2) in the A block is preferably 99/1 to 50/50, more preferably 95/5 to 70/30 (mass ratio).

  A repeating unit other than the repeating unit (1) and the repeating unit (2) may be contained in the A block. Examples of such a repeating unit include the aforementioned (meth) acrylic acid ester-based units. Examples include a repeating unit derived from a monomer. The content of the repeating unit other than the repeating unit (1) and the repeating unit (2) in the A block is preferably 0 to 50% by mass, more preferably 0 to 20% by mass. Most preferably it is not contained in the block.

  In the B block, the repeating unit (3) and the repeating unit (4) may be contained in any form of random copolymerization and block copolymerization. When the specific dispersant is a B-A-B block copolymer, the B1 block having the repeating unit (3) and not having the repeating unit (4), the repeating unit (4) and the repeating unit A B1-A-B2 block copolymer having a B2 block not having (3) may be used. In addition, the repeating unit (3) and the repeating unit (4) may be contained in two or more types in one B block, in which case each repeating unit is randomly copolymerized in the B block, It may be contained in any form of block copolymerization. The copolymerization ratio of repeating unit (3) / repeating unit (4) in the B block is preferably 99/1 to 50/50, more preferably 99/1 to 80/20 (mass ratio). The same applies to the B1 block / B2 block ratio.

  A repeating unit other than the repeating unit (3) and the repeating unit (4) may be contained in the B block. Examples of such a repeating unit include styrene monomers such as styrene and α-methylstyrene. (Meth) acrylate monomers such as (meth) acrylic acid chloride; (meth) acrylamide monomers such as (meth) acrylamide and N-methylolacrylamide; vinyl acetate; acrylonitrile; allyl glycidyl ether, croton Examples include acid glycidyl ether; repeating units derived from monomers such as N-methacryloylmorpholine. The content of the repeating unit other than the repeating unit (3) and the repeating unit (4) in the B block is preferably 0 to 50% by mass, more preferably 0 to 20% by mass. Most preferably it is not contained in the block.

  Whether the specific dispersant is an A-B block copolymer or a B-A-B block copolymer, the A block / B block ratio constituting the copolymer is from the viewpoint of dispersibility. It is preferable that it is 10 / 90-70 / 30, especially 25 / 75-55 / 45 (mass ratio).

  Further, the acid value of the specific dispersant is preferably lower from the viewpoint of dispersibility, and particularly preferably 0 mgKOH / g. Here, the acid value represents the number of mg of KOH necessary for neutralizing 1 g of the solid content of the dispersant.

  The molecular weight of the specific dispersant is preferably in the range of 1000 to 30,000 in terms of polystyrene-converted weight average molecular weight (hereinafter sometimes referred to as “Mw”). If the Mw is less than 1,000, the dispersion stability may be lowered. On the other hand, if it exceeds 30,000, the developability may be lowered, or dry foreign matter may be easily generated during coating by the slit nozzle method. is there.

  The specific dispersant can be produced by a known method. However, when the specific dispersant is a block copolymer, for example, it can be produced by living polymerization of the monomer for introducing each repeating unit. Can do. Examples of the living polymerization method include JP-A-9-62002, JP-A-2002-31713, and P.I. Lutz, P.M. Masson et al, Polym. Bull. 12, 79 (1984), B.R. C. Anderson, G.M. D. Andrews et al, Macromolecules, 14, 1601 (1981), K. et al. Hatada, K .; Ute, et al, Polym. J. et al. 17, 977 (1985), 18, 1037 (1986), Koichi right hand, Koichi Hatada, polymer processing, 36, 366 (1987), Toshinobu Higashimura, Mitsuo Sawamoto, Polymer Journal, 46, 189 (1989), M.M. Kuroki, T .; Aida, J .; Am. Chem. Soc, 109, 4737 (1987), Takuzo Aida, Shohei Inoue, Synthetic Organic Chemistry, 43, 300 (1985), D.C. Y. Sogoh, W .; R. Known methods described in Hertler et al, Macromolecules, 20, 1473 (1987) and the like can be employed.

  Examples of the monomer for introducing the repeating unit (1) used in producing the specific dispersant include (meth) acryloylaminopropyltrimethylammonium chloride, (meth) acryloyloxyethyltrimethylammonium chloride, and (meth) acryloyloxy. Examples thereof include ethyl triethylammonium chloride, (meth) acryloyloxyethyl (4-benzoylbenzyl) dimethylammonium bromide, (meth) acryloyloxyethylbenzyldimethylammonium chloride, (meth) acryloyloxyethylbenzyldiethylammonium chloride and the like. Examples of the monomer for introducing the repeating unit (2) include dimethylaminoethyl (meth) acrylate, diethylaminoethyl (meth) acrylate, dimethylaminopropyl (meth) acrylate, diethylaminopropyl (meth) acrylate, and the like. In the repeating unit (1), after polymerizing the monomer for introducing the repeating unit (2), the polymer is reacted with a halogenated hydrocarbon compound such as benzyl chloride to partially quaternize the amino group. Can also be introduced.

  Examples of the monomer for introducing the repeating unit (3) include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, isopropyl (meth) acrylate, butyl (meth) acrylate, 2- Examples include ethylhexyl (meth) acrylate, phenyl (meth) acrylate, cyclohexyl (meth) acrylate, dicyclopentanyl (meth) acrylate, isobornyl (meth) acrylate, benzyl (meth) acrylate, and phenylethyl (meth) acrylate. Examples of the monomer for introducing the repeating unit (4) include polyethylene glycol (n = 1-5) methyl ether (meth) acrylate, polyethylene glycol (n = 1-5) ethyl ether (meth) acrylate, polyethylene glycol. (N = 1-5) propyl ether (meth) acrylate, polypropylene glycol (n = 1-5) methyl ether (meth) acrylate, polypropylene glycol (n = 1-5) ethyl ether (meth) acrylate, polypropylene glycol (n = 1-5) Propyl ether (meth) acrylate and the like.

  In the present invention, other dispersants can be used in combination with the specific dispersant. Examples of the other dispersing agent include Disperbyk-161, Disperbyk-162, Disperbyk-165, Disperbyk-167, Disperbyk-170, Disperbyk-182, Disperbyk-2000, Disperbyk-2001 (above, manufactured by Kick B) Commercial products such as Solsperse 24000, Solsperse 76500 (manufactured by Lubrizol Corp.), Addisper PB821, Addispar PB822, Addisper PB823, Addisper PB824, Addisper PB827 (Ajinomoto Fine Techno Co., Ltd.), and the like.

  In the present invention, the content of the dispersant is not particularly limited, but is preferably 0.5 to 70 parts by weight, more preferably 5 to 50 parts by weight, with respect to 100 parts by weight of the colorant (A). Especially preferably, it is 5-30 mass parts. Further, the content ratio of the specific dispersant is preferably 25% by mass or more, more preferably 50% by mass or more with respect to the total amount of the specific dispersant and the other dispersant. By incorporating a dispersant in such a manner, a pixel having a high contrast ratio can be formed, and a radiation-sensitive composition excellent in storage stability and developability can be obtained.

-(C) Alkali-soluble resin-
The (C) alkali-soluble resin contained in the radiation-sensitive composition of the present invention is not particularly limited as long as it is soluble in an alkali developer used in the development processing step when forming the colored layer. Although not intended, it is usually a polymer having an acidic functional group such as a carboxyl group or a phenolic hydroxyl group. Among these, those containing a polymer having a carboxyl group (hereinafter sometimes referred to as “carboxyl group-containing polymer”) are preferred, and in particular, an ethylenically unsaturated monomer having one or more carboxyl groups ( Hereinafter, it may be referred to as “unsaturated monomer (c1)”) and another copolymerizable ethylenically unsaturated monomer (hereinafter referred to as “unsaturated monomer (c2)”). ) Is preferred.

As the unsaturated monomer (c1), for example,
Unsaturated carboxylic acids such as (meth) acrylic acid, crotonic acid, α-chloroacrylic acid, cinnamic acid;
Unsaturated dicarboxylic acids such as maleic acid, maleic anhydride, fumaric acid, itaconic acid, itaconic anhydride, citraconic acid, citraconic anhydride, mesaconic acid or anhydrides thereof;
Mono [(meth) acryloyloxyalkyl] of polyvalent carboxylic acids such as succinic acid mono [2- (meth) acryloyloxyethyl] and phthalic acid mono [2- (meth) acryloyloxyethyl] ester;
Examples thereof include mono (meth) acrylates of polymers having a carboxy group and a hydroxyl group at both ends, such as ω-carboxypolycaprolactone mono (meth) acrylate.
An unsaturated monomer (c1) can be used individually or in mixture of 2 or more types.
In the present invention, the unsaturated monomer (c1) is preferably (meth) acrylic acid, succinic acid mono [2- (meth) acryloyloxyethyl], ω-carboxypolycaprolactone mono (meth) acrylate, Particularly preferred is (meth) acrylic acid.
These unsaturated monomers (c1) can be used alone or in admixture of two or more.

  In the copolymer of the unsaturated monomer (c1) and the unsaturated monomer (c2), the copolymerization ratio of the unsaturated monomer (c1) is preferably 5 to 50% by mass, more preferably 10 to 10%. 40% by mass. In this case, if the copolymerization ratio is less than 5% by mass, the solubility of the resulting radiation-sensitive composition in an alkali developer tends to decrease, whereas if it exceeds 50% by mass, the solubility in an alkali developer tends to be low. When the development is performed with an alkaline developer, the pixel tends to be peeled off from the substrate and the film surface of the pixel is liable to become rough.

Moreover, as an unsaturated monomer (c2), for example,
Maleimide:
N-phenylmaleimide, N-o-hydroxyphenylmaleimide, Nm-hydroxyphenylmaleimide, Np-hydroxyphenylmaleimide, N-benzylmaleimide, N-cyclohexylmaleimide, N-succinimidyl-3-maleimidobenzoate, N- N-substituted maleimides such as succinimidyl-4-maleimidobutyrate, N-succinimidyl-6-maleimidocaproate, N-succinimidyl-3-maleimidopropionate, N- (acridinyl) maleimide;
Styrene, α-methylstyrene, o-vinyltoluene, m-vinyltoluene, p-vinyltoluene, p-chlorostyrene, o-methoxystyrene, m-methoxystyrene, p-methoxystyrene, o-vinylphenol, m-vinyl Phenol, p-vinylphenol, p-hydroxy-α-methylstyrene, o-vinylbenzylmethyl ether, m-vinylbenzylmethyl ether, p-vinylbenzylmethyl ether, o-vinylbenzylglycidyl ether, m-vinylbenzylglycidyl ether , Aromatic vinyl compounds such as p-vinylbenzyl glycidyl ether;
Indenes such as indene and 1-methylindene;

Methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, i-propyl (meth) acrylate, n-butyl (meth) acrylate, i-butyl (meth) acrylate, sec-butyl (meth) Acrylate, t-butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 2-hydroxybutyl ( (Meth) acrylate, 3-hydroxybutyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, allyl (meth) acrylate, benzyl (meth) acrylate, cyclohexyl (meth) acrylate, phenyl (meth) acrylate 2-methoxyethyl (meth) acrylate, 2-phenoxyethyl (meth) acrylate, methoxydiethylene glycol (meth) acrylate, methoxytriethylene glycol (meth) acrylate, methoxypropylene glycol (meth) acrylate, methoxydi Propylene glycol (meth) acrylate, isobornyl (meth) acrylate, tricyclo [5.2.1.0 ^2,6 ] decan-8-yl (meth) acrylate, 2-hydroxy-3-phenoxypropyl (meth) acrylate, Unsaturated carboxylic acid esters such as glycerol mono (meth) acrylate, 4-hydroxyphenyl (meth) acrylate, ethylene oxide modified (meth) acrylate of paracumylphenol;

Unsaturated carboxylic acid glycidyl esters such as glycidyl (meth) acrylate;
Carboxylic acid vinyl esters such as vinyl acetate, vinyl propionate, vinyl butyrate, vinyl benzoate;
Other unsaturated ethers such as vinyl methyl ether, vinyl ethyl ether, allyl glycidyl ether;
Vinyl cyanide compounds such as (meth) acrylonitrile, α-chloroacrylonitrile, vinylidene cyanide;
Unsaturated amides such as (meth) acrylamide, α-chloroacrylamide, N-2-hydroxyethyl (meth) acrylamide;
Aliphatic conjugated dienes such as 1,3-butadiene, isoprene, chloroprene;
Examples thereof include a macromonomer having a mono (meth) acryloyl group at the end of a polymer molecular chain such as polystyrene, polymethyl (meth) acrylate, poly-n-butyl (meth) acrylate, and polysiloxane.
These unsaturated monomers (c2) can be used alone or in admixture of two or more.

  In the present invention, as the unsaturated monomer (c2), N-position substituted maleimide, aromatic vinyl compound, unsaturated carboxylic acid ester, and macromonomer having a mono (meth) acryloyl group at the end of the polymer molecular chain. In particular, N-phenylmaleimide, N-cyclohexylmaleimide, styrene, α-methylstyrene, p-hydroxy-α-methylstyrene, methyl (meth) acrylate, n-butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate 2-hydroxyethyl (meth) acrylate, allyl (meth) acrylate, benzyl (meth) acrylate, glycerol mono (meth) acrylate, 4-hydroxyphenyl (meth) acrylate, ethylene oxide modified (meth) acrylate of paracumylphenol, Po Restyrene macromonomer and polymethyl methacrylate macromonomer are preferred.

  In the present invention, it is disclosed in, for example, JP-A-5-19467, JP-A-6-230212, JP-A-7-207211, JP-A-11-140144, JP-A-2008-181095, and the like. As described above, a carboxyl group-containing polymer having a polymerizable unsaturated bond such as a (meth) acryloyl group in the side chain can be used as the alkali-soluble resin.

Mw measured by gel permeation chromatography (GPC, elution solvent: tetrahydrofuran) of the alkali-soluble resin in the present invention is usually 1,000 to 45,000, preferably 3,000 to 20,000. If Mw is too small, the remaining film rate of the resulting film may be reduced, pattern shape, heat resistance, etc. may be impaired, and electrical characteristics may be deteriorated. On the other hand, if Mw is too large, resolution may be reduced. In addition, the pattern shape may be damaged, and dry foreign matter may be easily generated during application by the slit nozzle method.
In addition, the ratio (Mw / Mn) of Mw of the alkali-soluble resin in the present invention to the polystyrene-equivalent number average molecular weight (hereinafter referred to as “Mn”) measured by gel permeation chromatography (GPC, elution solvent: tetrahydrofuran) is , Preferably 1.0 to 5.0, more preferably 1.0 to 3.0.

  The alkali-soluble resin in the present invention is obtained by, for example, using an unsaturated monomer as a constituent component of 2,2′-azobisisobutyronitrile, 2,2′-azobis (2,4- (Dimethylvaleronitrile) and 2,2′-azobis (4-methoxy-2,4-dimethylvaleronitrile) can be produced by polymerization in the presence of a radical polymerization initiator.

  Moreover, the alkali-soluble resin in the present invention includes, for example, 2,2′-azobisisobutyronitrile and 2,2′-azobis (2,4-dimethylvaleronitrile) as unsaturated compounds as constituent components. , Radical polymerization initiators such as 2,2′-azobis (4-methoxy-2,4-dimethylvaleronitrile), and pyrazole-1-dithiocarboxylic acid cyano (dimethyl) methyl ester, pyrazole-1-dithiocarboxylate benzyl Ester, tetraethylthiuram disulfide, bis (pyrazol-1-ylthiocarbonyl) disulfide, bis (3-methyl-pyrazol-1-ylthiocarbonyl) disulfide, bis (4-methyl-pyrazol-1-ylthiocarbonyl) disulfide, Bis (5-methyl-pyrazol-1-ylthiocarbonyl) di In the presence of a molecular weight regulator that acts as an iniferter such as rufide, bis (3,4,5-trimethyl-pyrazol-1-ylthiocarbonyl) disulfide, bis (pyrrol-1-ylthiocarbonyl) disulfide, bisthiobenzoyl disulfide In the inert solvent, the reaction temperature is usually 0 to 150 ° C., preferably 50 to 120 ° C., and can be produced by living radical polymerization.

  Further, the alkali-soluble resin in the present invention is a method in which each unsaturated monomer as a constituent component is radicalized in a suitable solvent in the presence of the radical polymerization initiator and a polyvalent thiol compound that acts as a chain transfer agent. It can be produced by polymerization. Here, the polyvalent thiol compound means a compound having two or more thiol groups in one molecule, for example, trimethylolpropane tris (3-mercaptopropionate), pentaerythritol tetrakis (3-mercaptopropio). Nate), tetraethylene glycol bis (3-mercaptopropionate), dipentaerythritol hexakis (3-mercaptopropionate), pentaerythritol tetrakis (thioglycolate), 1,4-bis (3-mercaptobutyryl) Oxy) butane, pentaerythritol tetrakis (3-mercaptobutyrate), 1,3,5, -tris (3-mercaptobutyloxyethyl) -1,3,5-triazine-2,4,6 (1H, 3H , 5H) -trione and the like.

The alkali-soluble resin in the present invention can be purified through a reprecipitation method using two or more organic solvents having different polarities after radical polymerization of an unsaturated monomer as described above. That is, after removing insoluble impurities from the solution in a good solvent after polymerization by filtration or centrifugation as necessary, a large amount (usually 5 to 10 times the volume of the polymer solution) of a precipitant (poor) Purification by pouring into the solvent) and reprecipitation of the copolymer. At that time, of the impurities remaining in the polymer solution, impurities soluble in the precipitant remain in the liquid phase and are separated from the purified alkali-soluble resin.
Examples of the good solvent / precipitant combination used in this reprecipitation method include diethylene glycol monomethyl ether acetate / n-hexane, methyl ethyl ketone / n-hexane, diethylene glycol monomethyl ether acetate / n-heptane, and methyl ethyl ketone / n-heptane. Can be mentioned.

  In the present invention, the content of the (C) alkali-soluble resin is preferably 10 to 1,000 parts by mass, particularly preferably 20 to 500 parts by mass with respect to 100 parts by mass of the (A) colorant. In this case, if the content of the alkali-soluble resin is less than 10 parts by mass, for example, the alkali developability may decrease, or a residue or background stain may occur on the substrate or the light shielding layer in the unexposed area. On the other hand, when the amount exceeds 1,000 parts by mass, the colorant concentration relatively decreases, and it may be difficult to achieve the target color density as a thin film.

-(D) polyfunctional monomer-
The (D) polyfunctional monomer in the present invention is a monomer having two or more polymerizable unsaturated bonds.
As such a polyfunctional monomer, for example,
Di (meth) acrylates of alkylene glycols such as ethylene glycol and propylene glycol;
Di (meth) acrylates of polyalkylene glycols such as polyethylene glycol and polypropylene glycol;
Poly (meth) acrylates of trihydric or higher polyhydric alcohols such as glycerin, trimethylolpropane, pentaerythritol, dipentaerythritol and their dicarboxylic acid modified products;
Oligo (meth) acrylates such as polyester, epoxy resin, urethane resin, alkyd resin, silicone resin, spirane resin;
Di (meth) acrylates of both end hydroxyl polymers such as both end hydroxypoly-1,3-butadiene, both end hydroxypolyisoprene;
Examples include tris [2- (meth) acryloyloxyethyl] phosphate, isocyanuric acid ethylene oxide-modified triacrylate, poly (meth) acrylate having a urethane structure, poly (meth) acrylate having a caprolactone structure, and the like.

Among these polyfunctional monomers, poly (meth) acrylates of trihydric or higher polyhydric alcohols and their dicarboxylic acid-modified products, poly (meth) acrylates having a urethane structure, and poly (meth) having a caprolactone structure. ) Acrylate is preferred. Examples of poly (meth) acrylates of trihydric or higher polyhydric alcohols and their modified dicarboxylic acids include trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, pentaerythritol triacrylate, pentaerythritol trimethacrylate, pentaerythritol tetraacrylate. , Pentaerythritol tetramethacrylate, dipentaerythritol pentaacrylate, dipentaerythritol pentamethacrylate, dipentaerythritol hexaacrylate, dipentaerythritol hexamethacrylate, monoesterified product of pentaerythritol triacrylate and succinic acid, pentaerythritol trimethacrylate and succinic acid Monoesterified product with dipentaerythritol Monoesterified products of acrylate and succinic acid, and monoesterified products of dipentaerythritol pentamethacrylate and succinic acid are preferred, and in particular, trimethylolpropane triacrylate, pentaerythritol triacrylate, dipentaerythritol pentaacrylate, dipentaerythritol Monoesterified products of hexaacrylate, pentaerythritol triacrylate and succinic acid and monoesterified products of dipentaerythritol pentaacrylate and succinic acid have high strength of the colored layer, excellent surface smoothness of the colored layer, and unexposed This is preferable in that ground stains, film residues, and the like are hardly generated on the substrate and the light shielding layer.
The said polyfunctional monomer can be used individually or in mixture of 2 or more types.

  The content of the (D) polyfunctional monomer in the present invention is preferably 5 to 500 parts by mass, particularly preferably 20 to 300 parts by mass with respect to 100 parts by mass of the (C) alkali-soluble resin. In this case, when the content of the polyfunctional monomer is less than 5 parts by mass, the strength and surface smoothness of the pixel tend to be reduced. On the other hand, when the content exceeds 500 parts by mass, for example, alkali developability is reduced. In addition, background stains, film residue, etc. tend to occur on the unexposed portion of the substrate or on the light shielding layer.

In the present invention, a part of the polyfunctional monomer can be replaced with a monofunctional monomer having one polymerizable unsaturated bond.
Examples of the monofunctional monomer include divalent or higher polyvalent carboxylic acids such as succinic acid mono [2- (meth) acryloyloxyethyl] and phthalic acid mono [2- (meth) acryloyloxyethyl]. Mono (meth) acrylate of a polymer having a carboxy group and a hydroxyl group at both ends, such as mono [(meth) acryloyloxyalkyl] ester of acid, ω-carboxypolycaprolactone mono (meth) acrylate, and N- (meth) In addition to acryloylmorpholine, N-vinylpyrrolidone, N-vinyl-ε-caprolactam, commercially available products include M-5600 (trade name, manufactured by Toagosei Co., Ltd.).
These monofunctional monomers can be used alone or in admixture of two or more.

  The content ratio of the monofunctional monomer in the present invention is preferably 90% by mass or less, more preferably 50% by mass or less, with respect to the total of the polyfunctional monomer and the monofunctional monomer. In this case, when the use ratio of the monofunctional monomer exceeds 90% by mass, the strength and surface smoothness of the pixel tend to be lowered.

-(E) Photopolymerization initiator-
The (E) photopolymerization initiator used in the present invention is obtained by exposure to radiation such as visible light, ultraviolet light, far ultraviolet light, electron beam, and X-ray, and the (D) polyfunctional monomer and optionally used monomer. It is a compound that generates an active species capable of initiating polymerization of a functional monomer.
Examples of such photopolymerization initiators include thioxanthone compounds, acetophenone compounds, biimidazole compounds, triazine compounds, O-acyloxime compounds, onium salt compounds, benzoin compounds, benzophenone compounds, α -A diketone type compound, a polynuclear quinone type compound, a diazo type compound, an imide sulfonate type compound etc. can be mentioned.

  In the present invention, the photopolymerization initiator can be used alone or in admixture of two or more. As the photopolymerization initiator, thioxanthone compounds, acetophenone compounds, biimidazole compounds, triazine compounds , At least one selected from the group of O-acyloxime compounds is preferred.

Among the preferable photopolymerization initiators in the present invention, specific examples of the thioxanthone compounds include thioxanthone, 2-methylthioxanthone, 2-isopropylthioxanthone, 4-isopropylthioxanthone, 2-dodecylthioxanthone, 2,4-dimethylthioxanthone, 2 , 4-diethylthioxanthone, 2,4-diisopropylthioxanthone, 2-chlorothioxanthone and the like.
Of these thioxanthone compounds, 2-methylthioxanthone, 2-isopropylthioxanthone, 4-isopropylthioxanthone, and 2,4-diethylthioxanthone are preferable.
The thioxanthone compounds can be used alone or in admixture of two or more.

Specific examples of the acetophenone compound include 2-hydroxy-2-methyl-1-phenylpropan-1-one, 2-methyl-1- [4- (methylthio) phenyl] -2-morpholinopropane- 1-one, 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) butan-1-one, 2- (4-methylbenzyl) -2- (dimethylamino) -1- (4-morpho And linophenyl) butan-1-one, 1-hydroxycyclohexyl phenyl ketone, 2,2-dimethoxy-1,2-diphenylethane-1-one, 1,2-octanedione, and the like.
Among these acetophenone compounds, in particular, 2-methyl-1- [4- (methylthio) phenyl] -2-morpholinopropan-1-one, 2-benzyl-2-dimethylamino-1- (4-morpho Linophenyl) butan-1-one, 2- (4-methylbenzyl) -2- (dimethylamino) -1- (4-morpholinophenyl) butan-1-one, and the like are preferable.
The acetophenone compounds can be used alone or in admixture of two or more.

  Specific examples of the biimidazole compound include 2,2′-bis (2-chlorophenyl) -4,4 ′, 5,5′-tetrakis (4-ethoxycarbonylphenyl) -1,2′-bi Imidazole, 2,2′-bis (2-bromophenyl) -4,4 ′, 5,5′-tetrakis (4-ethoxycarbonylphenyl) -1,2′-biimidazole, 2,2′-bis (2 -Chlorophenyl) -4,4 ', 5,5'-tetraphenyl-1,2'-biimidazole, 2,2'-bis (2,4-dichlorophenyl) -4,4', 5,5'-tetra Phenyl-1,2′-biimidazole, 2,2′-bis (2,4,6-trichlorophenyl) -4,4 ′, 5,5′-tetraphenyl-1,2′-biimidazole, 2, 2'-bis (2-bromophenyl) -4,4 ', 5,5'-tetrafe 1,2′-biimidazole, 2,2′-bis (2,4-dibromophenyl) -4,4 ′, 5,5′-tetraphenyl-1,2′-biimidazole, 2,2 ′ -Bis (2,4,6-tribromophenyl) -4,4 ', 5,5'-tetraphenyl-1,2'-biimidazole and the like can be mentioned.

Among these biimidazole compounds, 2,2′-bis (2-chlorophenyl) -4,4 ′, 5,5′-tetraphenyl-1,2′-biimidazole, 2,2′-bis (2 , 4-dichlorophenyl) -4,4 ′, 5,5′-tetraphenyl-1,2′-biimidazole, 2,2′-bis (2,4,6-trichlorophenyl) -4,4 ′, 5 , 5′-tetraphenyl-1,2′-biimidazole and the like are preferable, and in particular, 2,2′-bis (2-chlorophenyl) -4,4 ′, 5,5′-tetraphenyl-1,2′- Biimidazole is preferred.
The biimidazole compounds can be used alone or in admixture of two or more.

In the present invention, when a biimidazole compound is used as a photopolymerization initiator, it is preferable to use a hydrogen donor described below in combination because the sensitivity can be further improved.
The “hydrogen donor” as used herein means a compound that can donate a hydrogen atom to a radical generated from a biimidazole compound by exposure.
As the hydrogen donor in the present invention, mercaptan compounds, amine compounds and the like defined below are preferable.

The mercaptan-based compound is a compound having a benzene ring or a heterocyclic ring as a mother nucleus and having one or more, preferably 1 to 3, more preferably 1 to 2, mercapto groups directly bonded to the mother nucleus (hereinafter referred to as “ Mercaptan-based hydrogen donor ").
The amine compound is a compound having a benzene ring or a heterocyclic ring as a mother nucleus and having 1 or more, preferably 1 to 3, more preferably 1 to 2 amino groups directly bonded to the mother nucleus (hereinafter referred to as “ Amine-based hydrogen donor ").
These hydrogen donors can also have a mercapto group and an amino group at the same time.

Hereinafter, the hydrogen donor will be described more specifically.
The mercaptan-based hydrogen donor can have one or more benzene rings or heterocyclic rings, and can have both a benzene ring and a heterocyclic ring. When two or more of these rings are present, It may or may not be formed.
In addition, when the mercaptan hydrogen donor has two or more mercapto groups, one or more of the remaining mercapto groups are substituted with an alkyl, aralkyl or aryl group as long as at least one free mercapto group remains. Furthermore, as long as at least one free mercapto group remains, a structural unit in which two sulfur atoms are bonded via a divalent organic group such as an alkylene group, or two sulfur atoms are It can have structural units linked in the form of disulfides.
Furthermore, the mercaptan-based hydrogen donor may be substituted with a carboxyl group, an alkoxycarbonyl group, a substituted alkoxycarbonyl group, a phenoxycarbonyl group, a substituted phenoxycarbonyl group, a nitrile group, or the like at a place other than the mercapto group.

Specific examples of such mercaptan hydrogen donors include 2-mercaptobenzothiazole, 2-mercaptobenzoxazole, 2-mercaptobenzoimidazole, 2,5-dimercapto-1,3,4-thiadiazole, 2-mercapto- 2,5-dimethylaminopyridine and the like can be mentioned.
Of these mercaptan-based hydrogen donors, 2-mercaptobenzothiazole and 2-mercaptobenzoxazole are preferable, and 2-mercaptobenzothiazole is particularly preferable.

In addition, the amine hydrogen donor can have one or more benzene rings or heterocyclic rings, and can have both a benzene ring and a heterocyclic ring. A ring may or may not be formed.
In the amine-based hydrogen donor, one or more of the amino groups may be substituted with an alkyl group or a substituted alkyl group, and a carboxyl group, an alkoxycarbonyl group, a substituted alkoxycarbonyl group, a phenoxy group may be substituted at a position other than the amino group. It may be substituted with a carbonyl group, a substituted phenoxycarbonyl group, a nitrile group or the like.

Specific examples of such amine-based hydrogen donors include 4,4′-bis (dimethylamino) benzophenone, 4,4′-bis (diethylamino) benzophenone, 4-diethylaminoacetophenone, 4-dimethylaminopropiophenone, Examples thereof include ethyl-4-dimethylaminobenzoate, 4-dimethylaminobenzoic acid, 4-dimethylaminobenzonitrile and the like.
Among these amine hydrogen donors, 4,4′-bis (dimethylamino) benzophenone and 4,4′-bis (diethylamino) benzophenone are preferable, and 4,4′-bis (diethylamino) benzophenone is particularly preferable.
The amine-based hydrogen donor has a function as a sensitizer even in the case of a photopolymerization initiator other than a biimidazole compound.

In the present invention, hydrogen donors can be used alone or in admixture of two or more. However, one or more mercaptan hydrogen donors and one or more amine hydrogen donors are used in combination. It is preferable that the formed colored layer does not easily fall off from the substrate during development, and the strength and sensitivity of the colored layer are high.
Specific examples of the combination of a mercaptan hydrogen donor and an amine hydrogen donor include 2-mercaptobenzothiazole / 4,4′-bis (dimethylamino) benzophenone, 2-mercaptobenzothiazole / 4,4′-bis. (Diethylamino) benzophenone, 2-mercaptobenzoxazole / 4,4′-bis (dimethylamino) benzophenone, 2-mercaptobenzoxazole / 4,4′-bis (diethylamino) benzophenone and the like, and more preferable combinations 2-mercaptobenzothiazole / 4,4′-bis (diethylamino) benzophenone, 2-mercaptobenzoxazole / 4,4′-bis (diethylamino) benzophenone, and a particularly preferred combination is 2-mercaptobenzothiazole / 4 4'-bis (diethylamino) benzophenone.
The weight ratio of mercaptan hydrogen donor to amine hydrogen donor in the combination of mercaptan hydrogen donor and amine hydrogen donor is usually 1: 1 to 1: 4, preferably 1: 1 to 1: 3.

  In the present invention, the content when the hydrogen donor is used in combination with the biimidazole compound is preferably 0.01 to 40 parts by mass, more preferably 100 parts by mass of the total of (D) polyfunctional monomers. Is 1 to 30 parts by mass, particularly preferably 1 to 20 parts by mass. In this case, if the content of the hydrogen donor is less than 0.01 parts by mass, the effect of improving the sensitivity tends to decrease. On the other hand, if the content exceeds 40 parts by weight, the formed colored layer peels off from the substrate during development. It tends to be easy to do.

  The amine-based hydrogen donor can function as a sensitizer when used in combination with a photopolymerization initiator other than a biimidazole compound such as an acetophenone compound. When an amine hydrogen donor is used as a sensitizer, the content thereof is usually 300 parts by mass or less, preferably 200 parts by mass or less, based on 100 parts by mass of a photopolymerization initiator other than a biimidazole compound. The amount is preferably 100 parts by weight or less. However, if the content is too small, it is difficult to obtain a sufficient effect. Therefore, the lower limit of the content is preferably 2 parts by weight, and more preferably 5 parts by weight.

  Specific examples of the triazine compound include 2,4,6-tris (trichloromethyl) -s-triazine, 2-methyl-4,6-bis (trichloromethyl) -s-triazine, 2- [2 -(5-methylfuran-2-yl) ethenyl] -4,6-bis (trichloromethyl) -s-triazine, 2- [2- (furan-2-yl) ethenyl] -4,6-bis (trichloro Methyl) -s-triazine, 2- [2- (4-diethylamino-2-methylphenyl) ethenyl] -4,6-bis (trichloromethyl) -s-triazine, 2- [2- (3,4-dimethoxy) Phenyl) ethenyl] -4,6-bis (trichloromethyl) -s-triazine, 2- (4-methoxyphenyl) -4,6-bis (trichloromethyl) -s-triazine, 2- (4- Triazine-based compounds having a halomethyl group such as xystyryl) -4,6-bis (trichloromethyl) -s-triazine, 2- (4-n-butoxyphenyl) -4,6-bis (trichloromethyl) -s-triazine Can be mentioned.

Of these triazine compounds, 2- [2- (3,4-dimethoxyphenyl) ethenyl] -4,6-bis (trichloromethyl) -s-triazine is particularly preferable.
The triazine compounds can be used alone or in admixture of two or more.

  Specific examples of the O-acyloxime compounds include 1,2-heptanedione, 1- [4- (phenylthio) phenyl]-, 2- (O-benzoyloxime), 1,2-octane. Dione, 1- [4- (phenylthio) phenyl]-, 2- (O-benzoyloxime), 1,2-octanedione, 1- [4- (benzoyl) phenyl]-, 2- (O-benzoyloxime) , Ethanone, 1- [9-ethyl-6- (2-methylbenzoyl) -9H-carbazol-3-yl]-, 1- (O-acetyloxime), ethanone, 1- [9-ethyl-6- ( 3-methylbenzoyl) -9H-carbazol-3-yl]-, 1- (O-acetyloxime), ethanone, 1- (9-ethyl-6-benzoyl-9H-carbazol-3-yl) , 1- (O-acetyloxime), ethanone, 1- [9-ethyl-6- (2-methyl-4-tetrahydrofuranylbenzoyl) -9H-carbazol-3-yl]-, 1- (O-acetyloxime ), Ethanone, 1- [9-ethyl-6- (2-methyl-4-tetrahydropyranylbenzoyl) -9H-carbazol-3-yl]-, 1- (O-acetyloxime), ethanone, 1- [ 9-ethyl-6- (2-methyl-5-tetrahydrofuranylbenzoyl) -9H-carbazol-3-yl]-, 1- (O-acetyloxime), ethanone, 1- [9-ethyl-6- (2 -Methyl-5-tetrahydropyranylbenzoyl) -9H-carbazol-3-yl]-, 1- (O-acetyloxime), ethanone, 1- [9-ethyl-6- {2-me 4- (2,2-dimethyl-1,3-dioxolanyl) benzoyl} -9H-carbazol-3-yl]-, 1- (O-acetyloxime), ethanone, 1- [9-ethyl-6- (2-Methyl-4-tetrahydrofuranylmethoxybenzoyl) -9H-carbazol-3-yl]-, 1- (O-acetyloxime), ethanone, 1- [9-ethyl-6- (2-methyl-4-) Tetrahydropyranylmethoxybenzoyl) -9H-carbazol-3-yl]-, 1- (O-acetyloxime), ethanone, 1- [9-ethyl-6- (2-methyl-5-tetrahydrofuranylmethoxybenzoyl)- 9H-carbazol-3-yl]-, 1- (O-acetyloxime), ethanone, 1- [9-ethyl-6- (2-methyl-5-tetrahydropyrani) Lmethoxybenzoyl) -9H-carbazol-3-yl]-, 1- (O-acetyloxime), ethanone, 1- [9-ethyl-6- {2-methyl-4- (2,2-dimethyl-1) , 3-Dioxolanyl) methoxybenzoyl} -9H-carbazol-3-yl]-, 1- (O-acetyloxime) and the like.

Among these O-acyloxime compounds, in particular, 1,2-octanedione, 1- [4- (phenylthio) phenyl]-, 2- (O-benzoyloxime), ethanone, 1- [9-ethyl- 6- (2-methylbenzoyl) -9H-carbazol-3-yl]-, 1- (O-acetyloxime), ethanone, 1- [9-ethyl-6- (2-methyl-4-tetrahydrofuranylmethoxybenzoyl) ) -9H-carbazol-3-yl]-, 1- (O-acetyloxime), ethanone, 1- [9-ethyl-6- {2-methyl-4- (2,2-dimethyl-1,3- Dioxolanyl) methoxybenzoyl} -9H-carbazol-3-yl]-, 1- (O-acetyloxime) and the like are preferable.
The O-acyloxime compounds can be used alone or in admixture of two or more.

  In this invention, 0.01-120 mass parts is preferable with respect to 100 mass parts of (C) polyfunctional monomers, and, as for content of a photoinitiator, 1-100 mass parts is especially preferable. In this case, if the content of the photopolymerization initiator is less than 0.01 parts by mass, curing by exposure becomes insufficient, and it may be difficult to obtain a color filter in which pixel patterns are arranged according to a predetermined arrangement. On the other hand, if it exceeds 120 parts by mass, the formed pixel pattern tends to be easily peeled off from the substrate during development.

-(F) Solvent-
Although the radiation sensitive composition of this invention contains the said (A)-(E) component and the additive mentioned later, normally, a solvent is mix | blended and it prepares as a liquid composition.
The solvent is appropriately selected as long as it can disperse or dissolve the components (A) to (E) and additive components described later, and does not react with these components and has appropriate volatility. Can be used.

As such a solvent, for example,
Ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol mono-n-propyl ether, ethylene glycol mono-n-butyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol mono-n-propyl ether, diethylene glycol mono-n- Butyl ether, triethylene glycol monomethyl ether, triethylene glycol monoethyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol mono-n-propyl ether, propylene glycol mono-n-butyl ether, dipropylene glycol monomethyl ether, di Propylene glycol mono Chirueteru, dipropylene glycol mono -n- propyl ether, dipropylene glycol mono -n- butyl ether, tripropylene glycol monomethyl ether, tripropylene glycol monoethyl (poly) alkylene glycol monoalkyl ethers such as ether;

Ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate, diethylene glycol monomethyl ether acetate, diethylene glycol monoethyl ether acetate, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, 3-methoxybutyl acetate, 3-methyl-3-methoxy (Poly) alkylene glycol monoalkyl ether acetates such as butyl acetate;
Other ethers such as diethylene glycol dimethyl ether, diethylene glycol methyl ethyl ether, diethylene glycol diethyl ether, tetrahydrofuran;
Ketones such as methyl ethyl ketone, cyclohexanone, 2-heptanone, 3-heptanone;

Diacetates such as propylene glycol diacetate, 1,3-butylene glycol diacetate, 1,6-hexanediol diacetate;
Lactic acid alkyl esters such as methyl lactate and ethyl lactate;
Ethyl 2-hydroxy-2-methylpropionate, methyl 3-methoxypropionate, ethyl 3-methoxypropionate, methyl 3-ethoxypropionate, ethyl 3-ethoxypropionate, ethyl ethoxyacetate, ethyl hydroxyacetate, 2-hydroxy Methyl 3-methylbutanoate, 3-methyl-3-methoxybutylpropionate, ethyl acetate, n-propyl acetate, i-propyl acetate, n-butyl acetate, i-butyl acetate, n-amyl formate, i-acetate -Amyl, n-butyl propionate, ethyl butyrate, n-propyl butyrate, i-propyl butyrate, n-butyl butyrate, methyl pyruvate, ethyl pyruvate, n-propyl pyruvate, methyl acetoacetate, ethyl acetoacetate, 2 -Other esters such as ethyl oxobutanoate;
Aromatic hydrocarbons such as toluene and xylene;
Examples include amides or lactams such as N, N-dimethylformamide, N, N-dimethylacetamide, and N-methylpyrrolidone.

Among these solvents, from the viewpoint of solubility, pigment dispersibility, coatability, etc., propylene glycol monomethyl ether, propylene glycol monoethyl ether, ethylene glycol monomethyl ether acetate, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, 3-methoxybutyl acetate, diethylene glycol dimethyl ether, diethylene glycol methyl ethyl ether, cyclohexanone, 2-heptanone, 3-heptanone, 1,3-butylene glycol diacetate, 1,6-hexanediol diacetate, ethyl lactate, 3-methoxypropionic acid Ethyl, methyl 3-ethoxypropionate, ethyl 3-ethoxypropionate, 3-methyl-3-methoxybutyl Pioneto acetate n- butyl acetate i- butyl, formic acid n- amyl acetate, i- amyl, n- butyl propionate, ethyl butyrate, i- propyl butyrate n- butyl, ethyl pyruvate and the like are preferable.
The said solvent can be used individually or in mixture of 2 or more types.

Further, together with the solvent, benzyl ethyl ether, di-n-hexyl ether, acetonyl acetone, isophorone, caproic acid, caprylic acid, 1-octanol, 1-nonanol, benzyl acetate, ethyl benzoate, diethyl oxalate, maleic acid A high boiling point solvent such as diethyl, γ-butyrolactone, ethylene carbonate, propylene carbonate, ethylene glycol monophenyl ether acetate may be used in combination.
The high boiling point solvents can be used alone or in admixture of two or more.

  The content of the solvent is not particularly limited, but from the viewpoint of applicability, stability, etc. of the resulting radiation-sensitive composition, the total concentration of each component excluding the solvent of the composition is usually An amount of 5 to 50% by mass is preferable, and an amount of 10 to 40% by mass is particularly preferable.

Although the radiation sensitive composition of this invention contains the said (A)-(F) component, it can further contain an additive as needed.
Examples of additives include fillers such as glass and alumina; polymer compounds such as polyvinyl alcohol and poly (fluoroalkyl acrylates); nonionic surfactants, cationic surfactants, anionic surfactants Surfactant such as an agent; vinyltrimethoxysilane, vinyltriethoxysilane, vinyltris (2-methoxyethoxy) silane, N- (2-aminoethyl) -3-aminopropylmethyldimethoxysilane, N- (2-aminoethyl) ) -3-Aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, 2- (3,4-epoxycyclohexyl) ethyltri Methoxysilane, 3-chloropropylmethyldimethyl Adhesion promoters such as xysilane, 3-chloropropyltrimethoxysilane, 3-methacryloyloxypropyltrimethoxysilane, 3-mercaptopropyltrimethoxysilane; 2,2-thiobis (4-methyl-6-tert-butylphenol), Antioxidants such as 2,6-di-t-butylphenol; UV absorbers such as 2- (3-t-butyl-5-methyl-2-hydroxyphenyl) -5-chlorobenzotriazole and alkoxybenzophenones; poly Anticoagulant such as sodium acrylate; malonic acid, adipic acid, itaconic acid, citraconic acid, fumaric acid, mesaconic acid, 2-aminoethanol, 3-amino-1-propanol, 5-amino-1-pentanol, 3 -Amino-1,2-propanediol, 2-amino-1,3-propanediol, - it can be given residue improving agents such as amino-1,2-butanediol.

In the present invention, the radiation-sensitive composition can be prepared by an appropriate method. For example, the radiation-sensitive composition can be prepared by mixing together with additives to which components (A) to (F) can be optionally added. . A more preferable method for preparing the radiation-sensitive composition includes (A) a coloring agent in (F) a solvent, in the presence of (B) a dispersing agent and, if necessary, a dispersing aid. Along with a part of the components, for example, using a bead mill, a roll mill, etc., mixed and dispersed while pulverizing to obtain a colorant dispersion, and in this colorant dispersion, (C) to (E) and, if necessary, Furthermore, the method of preparing by adding an additional solvent and additive and mixing can be mentioned.
Examples of the dispersion aid include pigment derivatives, and specific examples include copper phthalocyanine, diketopyrrolopyrrole, and sulfonic acid derivatives of quinophthalone.

Color filter The color filter of the present invention comprises a colored layer formed from the radiation-sensitive composition of the present invention.
The method for forming the color filter of the present invention will be described below.
First, on the surface of the substrate, if necessary, a radiation-sensitive composition in which a light shielding layer (black matrix) is formed so as to partition a pixel forming portion, and a red pigment, for example, is dispersed on the substrate. After applying the liquid composition of the product, pre-baking is performed to evaporate the solvent and form a coating film. Next, the coating film is exposed through a photomask, and then developed using an alkali developer to dissolve and remove the unexposed portions of the coating film, and then post-baked to form a red pixel pattern. A pixel array arranged in an array is formed.
Then, using the liquid composition of each radiation-sensitive composition in which a green or blue pigment is dispersed, each liquid composition is coated, pre-baked, exposed, developed, and post-baked in the same manner as described above. By sequentially forming the pixel array and the blue pixel array on the same substrate, a color filter in which the pixel arrays of the three primary colors of red, green, and blue are arranged on the substrate is obtained. However, in the present invention, the order of forming the pixels of each color is not limited to the above.
The black matrix can be formed using a black radiation-sensitive composition in the same manner as in the pixel formation.

Examples of the substrate used when forming the pixel and / or the black matrix include glass, silicon, polycarbonate, polyester, aromatic polyamide, polyamideimide, and polyimide.
In addition, these substrates may be subjected to appropriate pretreatment such as chemical treatment with a silane coupling agent or the like, plasma treatment, ion plating, sputtering, gas phase reaction method, vacuum deposition, etc., if desired.
When applying a liquid composition of a radiation sensitive composition to a substrate, an appropriate application such as a spray method, a roll coating method, a spin coating method (spin coating method), a slit die coating method, a bar coating method, an ink jet method, etc. Although a method can be employed, a spin coating method and a slit die coating method are particularly preferable.
The coating thickness is usually 0.1 to 10 μm, preferably 0.2 to 8.0 μm, particularly preferably 0.2 to 6.0 μm as the film thickness after drying.

As the radiation used when forming the pixel and / or the black matrix, for example, visible light, ultraviolet light, far ultraviolet light, electron beam, X-ray or the like can be used, but the wavelength is in the range of 190 to 450 nm. Some radiation is preferred.
Exposure of the radiation is generally preferred 10~10,000J / m ^2.
Examples of the alkali developer include sodium carbonate, sodium hydroxide, potassium hydroxide, tetramethylammonium hydroxide, choline, 1,8-diazabicyclo- [5.4.0] -7-undecene, An aqueous solution such as 5-diazabicyclo- [4.3.0] -5-nonene is preferred.
An appropriate amount of a water-soluble organic solvent such as methanol or ethanol, a surfactant, or the like can be added to the alkaline developer. In addition, it is usually washed with water after alkali development.
As a development processing method, a shower development method, a spray development method, a dip (immersion) development method, a paddle (liquid accumulation) development method, or the like can be applied. The development conditions are preferably 5 to 300 seconds at room temperature.

  Since the color filter of the present invention thus obtained has a high contrast ratio, it is extremely useful particularly for a color liquid crystal surface element represented by TV.

Color liquid crystal display element The color liquid crystal display element of the present invention comprises the color filter of the present invention.
The color liquid crystal display element of the present invention can have an appropriate structure. For example, the color filter is formed on a substrate different from the driving substrate on which the thin film transistor (TFT) is arranged, and the driving substrate and the substrate on which the color filter is formed are opposed to each other with a liquid crystal layer interposed therebetween. Further, a substrate in which a color filter is formed on the surface of a driving substrate on which a thin film transistor (TFT) is disposed, and a substrate in which an ITO (indium oxide doped with tin) electrode is formed are a liquid crystal layer. It is also possible to adopt a structure that is opposed to each other. The latter structure has the advantage that the aperture ratio can be remarkably improved, and a bright and high-definition liquid crystal display element can be obtained.

  Hereinafter, the embodiment of the present invention will be described more specifically with reference to examples. However, the present invention is not limited to the following examples.

Dispersant analysis Dispersant B1
Dispersant B1 is a commercial product of a pigment wetting and dispersing agent, and is a propylene glycol methyl ether acetate / butyl cellosolve = 1/1 (mass ratio) solution of a modified acrylic block copolymer (solid content concentration 40% by mass, Acid value = 0). A block having a repeating unit derived from methacryloyloxyethylbenzyldimethylammonium chloride and dimethylaminoethyl methacrylate by dispersing pyrolysis GC-MS, FT-IR measurement and proton NMR, methyl methacrylate, butyl methacrylate, 2-ethylhexyl It was confirmed to be a block copolymer (A / B = 38/62) composed of B block having repeating units derived from methacrylate, benzyl methacrylate and triethylene glycol ethyl ether methacrylate. Mw was 2700. The copolymerization ratio of each repeating unit was methacryloyloxyethylbenzyldimethylammonium chloride / dimethylaminoethyl methacrylate / methyl methacrylate / butyl methacrylate / 2-ethylhexyl methacrylate / benzyl methacrylate / triethylene glycol ethyl ether methacrylate = 34/4/16/17. / 12/10/7 (mass ratio).

Dispersant b1
Dispersant b1 is a commercial product of a pigment wetting and dispersing agent, and is a propylene glycol methyl ether acetate / butyl cellosolve = 1/1 (mass ratio) solution of a modified acrylic block copolymer (solid content concentration 40% by mass, Acid value = 0). According to pyrolysis GC-MS, FT-IR, and proton NMR measurement, the dispersant b1 has an A block having a repeating unit derived from methacryloyloxyethylbenzyldimethylammonium chloride, methyl methacrylate, butyl methacrylate, 2-ethylhexyl methacrylate, benzyl methacrylate and It was confirmed to be a block copolymer (A / B = 16/84) consisting of a B block having a repeating unit derived from triethylene glycol ethyl ether methacrylate. Mw was 4400. The copolymerization ratio of each repeating unit was methacryloyloxyethylbenzyldimethylammonium chloride / methyl methacrylate / butyl methacrylate / 2-ethylhexyl methacrylate / benzyl methacrylate / triethylene glycol ethyl ether methacrylate = 16/16/15/18/29/6 ( Mass ratio).

Dispersant synthesis Dispersant B2
A flask equipped with a condenser and a stirrer was charged with 1.0 part by weight of AIBN (2,2′-azobisisobutyronitrile) and 186 parts by weight of propylene glycol monomethyl ether acetate, followed by 27 parts by weight of methyl methacrylate and butyl methacrylate. 27 parts by mass, 21 parts by mass of 2-ethylhexyl methacrylate, 18 parts by mass of benzyl methacrylate and 3.6 parts by mass of cumyldithiobenzoate were charged, and the atmosphere was replaced with nitrogen for 30 minutes. Thereafter, the mixture was gently stirred to raise the temperature of the reaction solution to 60 ° C., and this temperature was maintained for 24 hours to perform living radical polymerization.
Next, a solution obtained by dissolving 1.0 part by mass of AIBN and 35 parts by mass of dimethylaminoethyl methacrylate in 70 parts by mass of propylene glycol monomethyl ether acetate and replacing with nitrogen for 30 minutes is added to this reaction solution, and living radical polymerization is performed at 60 ° C. for 24 hours. As a result, a solution of the block copolymer was obtained.
To the obtained block copolymer solution, 25 parts by mass of benzyl chloride and 50 parts by mass of propylene glycol monomethyl ether were added and reacted at 80 ° C. for 2 hours to obtain a solution containing the dispersant B2. Dispersant B2 comprises an A block having repeating units derived from methacryloyloxyethylbenzyldimethylammonium chloride and dimethylaminoethyl methacrylate, and a B block having repeating units derived from methyl methacrylate, butyl methacrylate, 2-ethylhexyl methacrylate and benzyl methacrylate. A block copolymer. As a result of proton NMR measurement, the copolymerization ratio of each repeating unit was methacryloyloxyethylbenzyldimethylammonium chloride / dimethylaminoethyl methacrylate / methyl methacrylate / butyl methacrylate / 2-ethylhexyl methacrylate / benzyl methacrylate = 34/4/18/18 / 14/12 (mass ratio).

Dispersant b2
A flask equipped with a condenser and a stirrer was charged with 1.0 part by weight of AIBN and 186 parts by weight of propylene glycol monomethyl ether acetate, followed by 27 parts by weight of methyl methacrylate, 27 parts by weight of butyl methacrylate, 19 parts by weight of 2-ethylhexyl methacrylate, and benzyl methacrylate. 16 parts by mass, 16 parts by mass of triethylene glycol ethyl ether methacrylate and 3.6 parts by mass of cumyldithiobenzoate were charged, and the atmosphere was replaced with nitrogen for 30 minutes. Thereafter, the mixture was gently stirred to raise the temperature of the reaction solution to 60 ° C., and this temperature was maintained for 24 hours to perform living radical polymerization.
Next, a solution obtained by dissolving 1.0 part by mass of AIBN and 54 parts by mass of dimethylaminoethyl methacrylate in 108 parts by mass of propylene glycol monomethyl ether acetate and replacing with nitrogen for 30 minutes is added to this reaction solution, and living at 60 ° C. for 24 hours. A solution containing the dispersant b2 was obtained by radical polymerization.
Dispersant b2 is composed of an A block having repeating units derived from dimethylaminoethyl methacrylate and a B block having repeating units derived from methyl methacrylate, butyl methacrylate, 2-ethylhexyl methacrylate, benzyl methacrylate, and triethylene glycol ethyl ether methacrylate. It is a block copolymer. As a result of proton NMR measurement, the copolymerization ratio of each repeating unit was dimethylaminoethyl methacrylate / methyl methacrylate / butyl methacrylate / 2-ethylhexyl methacrylate / benzyl methacrylate / triethylene glycol ethyl ether methacrylate = 34/17/17/12/10. / 10 (mass ratio).

Preparation of colorant dispersion Preparation Example 1
(A) C.I. I. Pigment Red 254 (manufactured by Ciba Specialty Chemicals, trade name BK-CF) is 15 parts by mass, (B) 3 parts by mass of a dispersant B1 as a specific dispersant (in terms of solid content), and propylene glycol monomethyl as a solvent Using a mixed solvent of ether acetate / propylene glycol monoethyl ether = 90/10 (mass ratio) so that the solid content concentration becomes 20% by mass, the mixture is mixed and dispersed by a bead mill for 12 hours to obtain a colorant dispersion (M-1 ) Was prepared.

Preparation Examples 2-13
Colorant dispersions (M-2) to (M-15) were prepared in the same manner as in Preparation Example 1, except that the colorant and dispersant were changed as shown in Table 1 in Preparation Example 1.

  In Table 1, “R254” means C.I. I. Pigment Red 254, “R177” is C.I. I. Pigment Red 177, “Y150” is C.I. I. Pigment Yellow 150, “Y139” means C.I. I. Pigment Yellow 139, “G36” is C.I. I. Pigment Green 36, “B15; 6” means C.I. I. Pigment Blue 15; 6, “V23” means C.I. I. Each means pigment violet 23;

(C) Synthesis of alkali-soluble resin Synthesis Example 1
A flask equipped with a condenser and a stirrer was charged with 2 parts by mass of 2,2′-azobisisobutyronitrile and 200 parts by mass of propylene glycol monomethyl ether acetate, followed by 15 parts by mass of methacrylic acid and 20 parts by mass of N-phenylmaleimide. , 55 parts by mass of benzyl methacrylate, 10 parts by mass of styrene and 3 parts by mass of 2,4-diphenyl-4-methyl-1-pentene (trade name: NOFMER MSD, manufactured by NOF Corporation) as a molecular weight regulator, Replaced. Thereafter, the mixture was gently stirred to raise the temperature of the reaction solution to 80 ° C., and this temperature was maintained for 5 hours for polymerization to obtain a resin solution (solid content concentration = 33% by mass). The obtained resin was Mw = 16,000 and Mn = 7,000. This resin solution is referred to as “resin solution (P1)”.

Example 1
Preparation of Radiation Sensitive Composition Colorant Dispersion (M-1) 100 parts by mass, (C) 10 parts by mass of resin solution (P1) as alkali-soluble resin (in terms of solid content), (D) polyfunctional monomer 15 parts by mass of dipentaerythritol hexaacrylate, and (E) 4 parts by mass of 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) butan-1-one as a photopolymerization initiator and 4,4′- Bis (diethylamino) benzophenone (1 part by mass) and propylene glycol monomethyl ether acetate as a solvent (F) were mixed to prepare a liquid composition (CR1) having a solid content concentration of 22% by mass.
The liquid composition (CR1) was evaluated according to the following procedure. The evaluation results are shown in Table 2.

Evaluation of chromaticity characteristics and contrast Three liquid compositions (CR1) were formed on a soda glass substrate on which a SiO ₂ film for preventing elution of sodium ions was formed on the surface by using a spin coater and varying the number of rotations. After coating, pre-baking was performed on a hot plate at 90 ° C. for 4 minutes to form three coating films having different film thicknesses.
Next, after these substrates were cooled to room temperature, the coating film was exposed to radiation containing wavelengths of 365 nm, 405 nm, and 436 nm at an exposure dose of 400 J / m ² using a high-pressure mercury lamp. Thereafter, a developing solution composed of a 0.04 mass% potassium hydroxide aqueous solution at 23 ° C. was discharged onto these substrates at a developing pressure of 1 kgf / cm ² (nozzle diameter 1 mm) to perform shower development for 1 minute. Thereafter, the substrate was washed with ultrapure water, air-dried, and then post-baked in a clean oven at 220 ° C. for 30 minutes to form a cured film for evaluation.

Using the color analyzer (MCPD2000 manufactured by Otsuka Electronics Co., Ltd.), the chromaticity coordinate value (x, y) and the stimulus value in the CIE color system with a C light source and a 2-degree visual field for the three cured films obtained. (Y) was measured.
Further, the substrate on which the cured film is formed is sandwiched between two deflecting plates, and the front deflecting plate is rotated while irradiating with a fluorescent lamp (wavelength range of 380 to 780 nm) from the back side, and the luminance meter LS-100 (Minolta) The maximum value and the minimum value of the transmitted light intensity were measured. A value obtained by dividing the maximum value by the minimum value was defined as the contrast ratio. From the measurement result, the contrast ratio at the chromaticity coordinate value x = 0.650 was obtained. The evaluation results are shown in Table 2.

Evaluation of Storage Stability The viscosity of the liquid composition (CR1) on the day of preparation was measured using an E-type viscometer manufactured by Tokyo Keiki. The liquid composition (CR1) was filled in a light-shielding glass container and allowed to stand at 23 ° C. for 14 days in a sealed state, and then the viscosity was measured again using an E-type viscometer manufactured by Tokyo Keiki. At this time, the increase rate of the viscosity after standing with respect to the viscosity on the day of preparation is calculated. When the increase rate is less than 5%, “◯”, when 5% or more and less than 10%, “Δ”, 10% or more Cases were evaluated as “x”. The evaluation results are shown in Table 2.

Examples 2-7 and Comparative Examples 1-8
Liquid compositions (CR2) to (CR15) were prepared in the same manner as in Example 1, except that the type of the colorant dispersion was changed as shown in Table 2 in Example 1.
Next, evaluation was performed in the same manner as in Example 1 except that the liquid compositions (CR2) to (CR15) were used in place of the liquid composition (CR1). Regarding the red liquid compositions (CR2) to (CR4), (CR8) to (CR11) and (CR14), the contrast ratio at the chromaticity coordinate value x = 0.650 is set to the green liquid composition (CR5 ), (CR7), (CR12), and (CR15), the chromaticity coordinate value y = 0.600, and the blue liquid compositions (CR6) and (CR13), the chromaticity coordinate value y = The contrast ratio at 0.080 was determined for each. The evaluation results are shown in Table 2.

Evaluation of developability After applying the liquid compositions (CR1) to (CR15) on a soda glass substrate on which a SiO ₂ film for preventing elution of sodium ions is formed on the surface using a spin coater, Pre-baking was performed for 4 minutes on a hot plate to form a coating film having a thickness of 2.5 μm.
Next, after cooling these substrates to room temperature, a high-pressure mercury lamp is used and a coating film is irradiated with radiation containing wavelengths of 365 nm, 405 nm, and 436 nm through a striped photomask at an exposure dose of 1,000 J / m ² . And exposed. Thereafter, a developing solution composed of a 0.04 mass% potassium hydroxide aqueous solution at 23 ° C. was discharged onto these substrates at a developing pressure of 1 kgf / cm ² (nozzle diameter 1 mm) to perform shower development for 1 minute.
As a result, for the liquid compositions (CR1) to (CR13) and (CR15), it was possible to form a striped pixel pattern on the substrate, but for the liquid composition (CR14), the unexposed substrate. A development residue was generated on the top, and a stripe pixel pattern could not be formed.

Claims (7)

(A) Colorant, (B) Dispersant, (C) Alkali-soluble resin, (D) Multifunctional monomer, (E) Photopolymerization initiator, and (F) Colored layer formation feeling A radiation composition comprising:
As the dispersant (B), a copolymer having a repeating unit represented by the following formula (1), a repeating unit represented by the following formula (2) and a repeating unit represented by the following formula (3) is contained. A radiation-sensitive composition for forming a colored layer.

(In the formula ^(1), R 1 ~R ³ are independently of each other hydrogen atom, or have a substituent group which may chain or cyclic a hydrocarbon group, among R ¹ to R ³ Two or more may be bonded to each other to form a cyclic structure, R ⁴ represents a hydrogen atom or a methyl group, X represents a divalent linking group, and Y ⁻ represents a counter anion.)

(In the formula (2), R ⁵ and R ⁶ each independently represent a hydrogen atom or a chain or cyclic hydrocarbon group which may have a substituent, and R ⁵ and R ⁶ are And may be bonded to form a cyclic structure, R ⁷ represents a hydrogen atom or a methyl group, and Z represents a divalent linking group.)

(In the formula (3), R ⁸ good chain may have a substituent or cyclic alkyl group, an optionally substituted aryl group, or optionally substituted aralkyl And R ⁹ represents a hydrogen atom or a methyl group.) The radiation-sensitive composition for forming a colored layer according to claim 1, wherein the copolymer further has a repeating unit represented by the following formula (4).

(In the formula (4), R ¹⁰ represents an ethylene or propylene group, R ¹¹ represents an alkyl group having 1 to 5 carbon atoms, R ¹² represents a hydrogen atom or a methyl group, n represents an integer from 1 to 20 Is shown.)   The copolymer has an A block having a repeating unit represented by the formula (1) and a repeating unit represented by the formula (2), a repeating unit represented by the formula (1), and the formula (1). The feeling for forming a colored layer according to claim 1, which is a block copolymer having no repeating unit represented by 2) and having a B block having a repeating unit represented by the formula (3). Radiation composition.   The radiation-sensitive composition for forming a colored layer according to claim 3, wherein the B block further has a repeating unit represented by the formula (4).   The color filter provided with the colored layer formed using the radiation sensitive composition for colored layer formation of any one of Claims 1-4.   A color liquid crystal display device comprising the color filter according to claim 5. A colorant dispersion containing a colorant, a dispersant and a solvent,
It contains a copolymer having a repeating unit represented by the following formula (1), a repeating unit represented by the following formula (2) and a repeating unit represented by the following formula (3) as the dispersant. Characteristic colorant dispersion.

(In the formula ^(1), R 1 ~R ³ are independently of each other hydrogen atom, or have a substituent group which may chain or cyclic a hydrocarbon group, among R ¹ to R ³ Two or more may be bonded to each other to form a cyclic structure, R ⁴ represents a hydrogen atom or a methyl group, X represents a divalent linking group, and Y ⁻ represents a counter anion.)

(In the formula (2), R ⁵ and R ⁶ each independently represent a hydrogen atom or a chain or cyclic hydrocarbon group which may have a substituent, and R ⁵ and R ⁶ are binding to which may form a cyclic structure .R ⁷ represents a hydrogen atom or a methyl group, Z is a divalent linking group.)

(In the formula (3), R ⁸ represents a chain or cyclic alkyl group which may have a substituent, an aryl group which may have a substituent, or an aralkyl which may have a substituent. And R ⁹ represents a hydrogen atom or a methyl group.)