JP2006126387A - Black coloring material for black matrix, black composition for black matrix, black matrix and color filter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a black coloring material for a black matrix, from which the black matrix having excellent surface smoothness, an excellent light shielding property and high optical density can be obtained, to provide a black coloring material-containing black composition for the black matrix, to provide another black composition for the black matrix, which is obtained from the black coloring material-containing black composition and to which photosensitivity is imparted and to provide a coating film forming material-containing color filter obtained from the black coloring material-containing black composition for the black matrix or the photosensitive black composition for the black matrix. <P>SOLUTION: This black coloring material for the black matrix consists of black composite granular powder obtained by coating at least a part of the surface of a carbon black particle with a surface finishing agent and making a pigment derivative and/or an organic pigment exist on the surface of the surface finishing agent-coated carbon black particle. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a black colored material for black matrix which can obtain a black matrix having a high optical density and excellent surface smoothness and light shielding property, a black composition for black matrix containing the black colored material for black matrix, Provided is a black composition for black matrix provided with photosensitivity obtained from the black composition, a black composition for black matrix, or a color filter comprising a coating film formed from the black composition for photosensitive black matrix. To do.

  In the current information society, various information devices such as personal computers are prevalent regardless of business use, personal use, and home use, and a display is always incorporated in the terminal. In particular, since portable information devices are required to be light and space-saving, liquid crystal display elements (LCD) are used and colorization is progressing.

  A color liquid crystal display (LCD) has three primary colors of R (red), G (green), and B (blue) or three primary colors of C (cyan), Y (yellow), and M (magenta) on a glass substrate. It is obtained by forming a regularly arranged color filter layer and a black matrix layer for light shielding.

  The black matrix layer 1) improves the display contrast by blocking the backlight light other than the pixels, 2) prevents color mixing of adjacent pixels and prevents color purity degradation, and 3) TFTs caused by photocurrent. 4) to prevent a decrease in contrast due to reflection of background light on the display surface.

  With the recent improvement in image quality of liquid crystal display elements (LCDs), higher performance is also required for the black matrix layer. To achieve the above objectives, a high light-shielding rate, low reflectance, and fine pattern properties are required. It is requested.

  So far, for the purpose of improving the dispersion stability in the paint, an organic dye derivative or the like has been wet-treated (Patent Documents 1 and 2) or dry-processed (Patent Document 3) on the surface of carbon black. Yes.

JP 2000-313837 A JP 2004-224947 A JP 2004-224948 A

  A black coloring material for black matrix, which is excellent in surface smoothness and light-shielding property and can obtain a black matrix having a high optical density, is currently most demanded, but has not yet been obtained.

  Patent Documents 1 and 2 describe wet treatment of an organic dye derivative or the like on the surface of carbon black. However, when the treatment is performed in a solvent, the compatibility between the solvent and the surface of carbon black is described. In order to treat a sufficient amount of the organic dye derivative, an excess of the organic dye derivative is necessary, which is disadvantageous from the viewpoint of industrial and environmental impact. Moreover, since the desorption rate from the particle surface is high and effective dispersion in the black composition for black matrix cannot be expected, it is difficult to obtain a black matrix having sufficient surface smoothness and optical density.

  Further, Patent Document 3 describes that an organic dye derivative or the like is dry-treated on the surface of carbon black, but only carbon black and an organic dye derivative are physically mixed. As shown in the examples, it is difficult to obtain a black matrix having sufficient surface smoothness and optical density because the removal rate from the particle surface is high and the dispersibility in the black composition for black matrix is reduced. .

  Therefore, it is a technical object of the present invention to obtain a black coloring material for a black matrix which is excellent in surface smoothness and light shielding properties and which can obtain a black matrix having a high optical density.

  As a result of intensive studies to solve the above-mentioned problems, the present inventors have found that at least a part of the particle surface of the carbon black particle powder is coated with the surface treatment agent, and the pigment derivative and the surface treatment agent-coated surface are coated with the surface treatment agent. It has been found that a black matrix excellent in surface smoothness and optical density can be obtained by using black composite particle powder characterized by the presence of an organic pigment as a coloring material for black matrix. It came.

  That is, according to the present invention, at least a part of the particle surface of the carbon black particle powder is coated with a surface treatment agent, and a pigment derivative and / or an organic pigment is present on the particle surface of the surface treatment agent-coated carbon black particle. A black coloring material for a black matrix, comprising black composite particle powder (Invention 1).

  The present invention also provides a black composite particle powder in which at least a part of the particle surface of the carbon black particle powder is coated with a surface treatment agent, and a pigment derivative is present on the particle surface of the surface treatment agent-coated carbon black particle. This is a black coloring material for a black matrix (Invention 2).

The present invention also provides that at least a part of the particle surface of the carbon black particle powder is coated with a surface treatment agent, and the surface of the surface treatment agent-coated carbon black particle is coated with a phthalocyanine derivative or a CIE Lab color space display system. It is a black coloring material for black matrix characterized by comprising black composite particle powder in which an organic pigment having an L ^* value of 40 or less and a chroma C ^* value of 30 or less is present (Invention 3).

  Further, the present invention is a black composition for black matrix obtained by dispersing the black coloring material for black matrix of the present invention 1 to 3 in a solvent (Invention 4).

  Further, the present invention is the black composition for black matrix, wherein the black composition for black matrix of the present invention 4 contains a transparent resin having at least one acidic group and / or latent acidic group. (Invention 5).

  Further, the present invention is characterized in that the black composition for a black matrix according to the present invention 5 contains a photo radical polymerization initiator and a polyfunctional monomer having two or more ethylenically unsaturated double bonds. This is a black composition for black matrix to which photosensitivity is imparted (Invention 6).

  Further, the present invention is a black composition for black matrix imparted with photosensitivity, characterized in that the black composition for black matrix according to the present invention 5 contains a photoacid generator (Invention 7). .

  Further, the present invention is a black matrix comprising the black composition for black matrix according to any one of the present inventions 5 to 7 (present invention 8).

  Further, the present invention is a color filter comprising a coating film formed of the black composition for a black matrix according to any one of the present inventions 5 to 7 (present invention 9).

  The black coloring material for black matrix according to the present invention is suitable as a black coloring material for black matrix because of its excellent dispersibility in the vehicle and high coloring power.

  The black composition for black matrix in the present invention is suitable as a black composition for black matrix because a black matrix having a high optical density can be obtained by using the black coloring material for black matrix.

  Since the color filter in the present invention uses a black matrix having a high optical density, it is suitable as a color filter having a high contrast.

  The configuration of the present invention will be described in more detail as follows.

  First, the black coloring material for black matrix according to the present invention will be described.

  In the black coloring material for black matrix according to the present invention, at least a part of the surface of the carbon black particles as the core particle powder is coated with the surface treatment agent, and the surface treatment agent-coated particles and / or the carbon black particles. It is composed of composite particles in which organic pigments or pigment derivatives are present on the surface of the particles.

  As the carbon black particle powder in the present invention, furnace black, channel black, acetylene black, thermal black and the like can be used.

  The particle shape of the carbon black may be any shape such as a spherical shape, a granular shape, a polyhedral shape, a needle shape, a spindle shape, a rice granular shape, a flake shape, a scale shape, and a plate shape.

  The particle size of the carbon black is preferably an average particle size of 0.001 to 2.0 μm, more preferably 0.005 to 1.5 μm, and still more preferably 0.01 to 1.0 μm.

  When the average particle diameter exceeds 2.0 μm, the resulting black coloring material for black matrix becomes coarse particles, which is not preferable because coloring power and hiding power are reduced. In general, the upper limit of the film thickness of the black matrix is about 2.0 μm, and when the particle diameter is larger than that, the surface becomes rough, which is not preferable.

BET specific surface area of the carbon black is at 0.5m ² / g~500m ² / g or more, preferably 0.75m ² / g~400m ² / g, more preferably 1.0m ² / g~300m ² / g.

The blackness of the carbon black in the present invention has an L ^* value of 33.0 or less, preferably 32.0 or less, more preferably 31.0 or less.

The hiding power of carbon black in the present invention is preferably 2,000 cm ² / g or more, more preferably 2,500 cm ² / g or more, and still more preferably 3,000 cm ² / g or more.

  At least a part of the surface of the carbon black particles used in the present invention is coated with a surface treatment agent. Any surface treatment agent may be used as long as it can attach a pigment derivative and / or an organic pigment to the surface of the carbon black particles. Examples of the surface treatment agent include alkoxysilane, fluoroalkylsilane, and silane coupling. An organic silicon compound such as an agent and organopolysiloxane, a coupling agent such as titanate, aluminate and zirconate, a low molecular or high molecular surfactant and the like are preferably used. More preferred are organosilicon compounds such as alkoxysilanes, fluoroalkylsilanes, silane coupling agents, and organopolysiloxanes.

  Examples of organosilicon compounds include methyltriethoxysilane, dimethyldiethoxysilane, phenyltriethoxysilane, diphenyldiethoxysilane, methyltrimethoxysilane, dimethyldimethoxysilane, phenyltrimethoxysilane, diphenyldimethoxysilane, ethyltriethoxysilane, and propyl. Alkoxysilanes such as triethoxysilane, butyltriethoxysilane, isobutyltrimethoxysilane, hexyltriethoxysilane, octyltriethoxysilane and decyltriethoxysilane, trifluoropropyltrimethoxysilane, tridecafluorooctyltrimethoxysilane, heptadeca Fluorodecyltrimethoxysilane, trifluoropropyltriethoxysilane, heptadecafluorodecyltriethoxysilane And fluoroalkylsilanes such as tridecafluorooctyltriethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, γ-aminopropyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane, γ-mercaptopropyltrimethoxysilane, Silane coupling such as γ-methacryloyloxypropyltrimethoxysilane, N- (β-aminoethyl) -γ-aminopropyltrimethoxysilane, γ-glycidoxypropylmethyldimethoxysilane, γ-chloropropyltrimethoxysilane Agents, organopolysiloxanes such as polysiloxane, methyl hydrogen polysiloxane, and modified polysiloxane.

  Titanate coupling agents include isopropyl tristearoyl titanate, isopropyl tris (dioctyl pyrophosphate) titanate, isopropyl tri (N-aminoethylaminoethyl) titanate, tetraoctyl bis (ditridecyl phosphate titanate, tetra (2,2 diallyl) Examples include oxymethyl-1-butyl) bis (ditridecyl) phosphate titanate, bis (dioctylpyrophosphate) oxyacetate titanate, and bis (dioctylpyrophosphate) ethylene titanate.

  Examples of the aluminate coupling agent include acetoalkoxy aluminum diisopropylate, aluminum diisopropoxy monoethyl acetoacetate, aluminum trisethyl acetoacetate, aluminum trisacetylacetonate and the like.

  Examples of the zirconate coupling agent include zirconium tetrakisacetylacetonate, zirconium dibutoxybisacetylacetonate, zirconium tetrakisethylacetoacetate, zirconium tribotoxymonoethylacetoacetate, zirconium tributoxyacetylacetonate and the like.

  Examples of the low molecular surfactant include alkylbenzene sulfonate, dioctyl sulfone succinate, alkylamine acetate, alkyl fatty acid salt and the like. Examples of the polymeric surfactant include polyvinyl alcohol, polyacrylate, carboxymethylcellulose, acrylic acid-maleate copolymer, and olefin-maleate copolymer.

  The coating amount of the surface treatment agent is preferably 0.02 to 5.0% by weight in terms of a metal element contained in the surface treatment agent with respect to carbon black. More preferably, it is 0.03-3.0 weight%, More preferably, it is 0.05-2.0 weight%. If it is less than 0.02% by weight, it is difficult to attach 0.05 parts by weight or more of the pigment derivative and / or organic pigment to 100 parts by weight of carbon black. Since a pigment derivative and / or an organic pigment can be attached in an amount of 0.05 to 50 parts by weight with respect to 100 parts by weight of carbon black at a coating amount of up to 5.0% by weight, there is no meaning to coat more than necessary.

  As the organic pigment in the present invention, generally used are red organic pigments, blue organic pigments, yellow organic pigments, green organic pigments, orange organic pigments, brown organic pigments and purple organics which are used as colorants. Various organic pigment particle powders such as pigments can be used.

Among various organic pigments, red organic pigments include azo pigments such as brilliant carmine and permanent red, condensed azo pigments such as condensed azo red, and diaminoanthraquinonyl red, quinacridone red, thioindigo red, perylene red, and perinone red. , Condensed polycyclic pigments such as isoindoline red and diketopyrrolopyrrole red can be used. As the blue organic pigment, phthalocyanine pigments such as metal-free phthalocyanine blue, phthalocyanine blue and fast sky blue, condensed polycyclic pigments such as indanthrone blue and indigo blue, and alkali blue can be used. Examples of yellow organic pigments include monoazo pigments such as Hansa Yellow, disazo pigments such as benzidine yellow and permanent yellow, condensed azo pigments such as condensed azo yellow, anthrapyrimidine yellow, isoindolinone yellow, isoindoline yellow, and quinophthalone yellow. These condensed polycyclic pigments can be used. As the green organic pigment, a phthalocyanine pigment such as phthalocyanine green can be used. Examples of orange organic pigments include azo pigments such as permanent orange, resol fast orange, pyrazolone orange, and balkan fast orange, and many condensation products such as quinacridone, perinone orange, isoindolinone orange, isoindoline orange, and diketopyrrolopyrrole orange. Cyclic pigments can be used. As the brown organic pigment, azo pigments such as permanent brown, para brown and benzimidazolone brown and condensed polycyclic pigments such as thioindigo brown can be used. As the purple organic pigment, azo pigments such as fast violet and condensed polycyclic pigments such as unsubstituted quinacridone, dioxazine violet and perylene violet can be used. In consideration of the blackness of the black coloring material obtained for black matrix, the L ^* value in the CIE Lab color space display system is preferably 70.0 or less, more preferably 50.0 or less, still more preferably 40. 0 or less. For the same reason, the saturation C ^* value is preferably 40.0 or less, more preferably 30.0 or less, and even more preferably 20.0 or less.

  As the pigment derivative in the present invention, a compound obtained by introducing a substituent into the pigment skeleton of an organic pigment can be used.

  Organic pigments that are the main skeleton include phthalocyanine pigments, cyclidone, anthraquinone, perylene, perinone, indigo, dioxazine, quinophthalone, isoindolinone, isoindoline, diketopyrrolopyrrole, etc. Examples thereof include condensed polycyclic pigments and azo pigments.

Examples of the substituent of the pigment derivative include a sulfonic acid group, a carboxyl group, a phosphoric acid group, an alkylamino group, and a phthalimide group. _{Specifically, -SO 3 M, -OSO 3 M} , -COOM, -P = O (OM) 2 ( wherein, M represents a hydrogen atom or a lithium, potassium, an alkali metal such as sodium), - NR ₁ R ₂ , a side chain amine having a terminal group of —NR ₁ R ₂ R ₃ ⁺ X ^— , a main chain amine represented by> NR ₁ R ₂ ⁺ X ⁻ (wherein R ₁ , R ₂ , R ₃ represents a hydrogen atom or a hydrocarbon group, and X ⁻ represents a halogen element ion such as fluorine, chlorine, bromine or iodine, or an inorganic / organic ion).

  Specifically, Solsperse 5000 (trade name), Solsperse 12000 (trade name), Solsperse 22000 (trade name) (above, manufactured by Avicia Co., Ltd.), EFKA 6745 (trade name), which are phthalocyanine derivatives and azo pigment derivatives. ), EFKA 6750 (trade name) (above, manufactured by Fuka Additives) and the like can be suitably used. For the same reason as organic pigments, phthalocyanine derivatives are more preferable.

  Considering the blackness of the black coloring material obtained for black matrix, it is preferable to use a phthalocyanine derivative having an acidic substituent, and more preferably a phthalocyanine derivative having a sulfonic acid group as a substituent.

  The adhesion amount of the pigment derivative and / or organic pigment in the present invention varies depending on the surface area of the core particle powder, but is 0.05 to 50 parts by weight as a total amount of the pigment derivative and the organic pigment with respect to 100 parts by weight of the core particle powder. Yes, preferably 0.1 to 40 parts by weight, more preferably 0.2 to 30 parts by weight. When the amount is less than 0.05 parts by weight, the amount of the pigment derivative and the organic pigment covering the particle surface of the core particle is too small, and it is difficult to obtain the black composite particle powder that is the object of the present invention. When the amount exceeds 50 parts by weight, there are too many pigment derivatives and organic pigments relative to the core particle powder, so that dispersibility and dispersion stability in the black composition are lowered.

  The particle shape and particle size of the black coloring material for black matrix according to the present invention greatly depend on the particle shape and particle size of carbon black, which is the core particle, and have a particle form similar to the core particle.

  That is, the average particle diameter of the black coloring material for black matrix according to the present invention is preferably 0.001 to 2.0 μm, more preferably 0.005 to 1.5 μm, still more preferably 0.01 to 1.0 μm. is there.

  When the average particle diameter exceeds 2.0 μm, the particle size is too large, and the coloring power and the hiding power are reduced, which is not preferable. In general, the upper limit of the film thickness of the black matrix is about 2.0 μm, and when the particle diameter is larger than that, the surface becomes rough, which is not preferable. When the average particle size is less than 0.001 μm, dispersion in the vehicle may be difficult.

  The particle shape of the black coloring material for the black matrix according to the present invention may be any shape such as spherical shape, granular shape, polyhedron shape, needle shape, spindle shape, rice grain shape, flake shape, flake shape and plate shape. .

BET specific surface area value of the black matrix for black coloring material according to the present invention is preferably 0.5m ² / g~500m ² / g, more preferably 0.75m ² / g~400m ² / g, still more preferably 1 It is 0.0 m < ² > / g-300 m < ² > / g. When the BET specific surface area value is less than 0.5 m ² / g, the particles are coarse and the coloring power and the hiding power are lowered, which is not preferable.

The blackness of the black coloring material for black matrix according to the present invention has an L ^* value of 29.0 or less, preferably 28.0 or less, and more preferably 27.0 or less. When the L ^* value exceeds 29.0, the brightness is too high, and it is difficult to obtain a black matrix having a high optical density.

The hiding power of the black coloring material for black matrix according to the present invention is preferably 4,000 cm ² / g or more, more preferably 5,000 cm ² / g or more, still more preferably 6,000 cm ² / g or more, most preferably It is 7,000 cm ² / g or more. When the hiding power is less than 4,000 cm ² / g, it is difficult to obtain a black matrix having excellent light shielding properties.

  The removal rate of the pigment derivative or organic pigment of the black coloring material for black matrix according to the present invention is preferably 20% or less, more preferably 15% or less, and even more preferably 10% or less in the evaluation method described later. . When the desorption rate of the pigment derivative or organic pigment exceeds 20%, the desorption rate from the surface of the carbon black particles is high, and effective dispersion in the black composition for the black matrix cannot be expected. When used as a black matrix, it becomes difficult to obtain sufficient optical density and surface smoothness.

  Next, the black composition for black matrix according to the present invention will be described.

  The black composition for black matrix according to the present invention is constituted by dispersing the black coloring material for black matrix according to the present invention in a solvent, further comprising a transparent resin having at least one acidic group, Further, in order to impart photosensitivity, it is configured to contain a photopolymerization initiator and a polyfunctional monomer having two or more ethylenically unsaturated double bonds or a photoacid generator.

  Below, the compound and composition which comprise the black composition for black matrices concerning this invention are demonstrated in detail.

  The black composition for black matrix which concerns on this invention 4 contains the said black coloring material for black matrix, and a solvent. If necessary, a dispersant or the like may be added.

<Solvent>
As a solvent in the present invention, a black coloring material for black matrix and a transparent resin, and further a polyfunctional monomer having two or more ethylenically unsaturated double bonds, a photopolymerization initiator and a photoacid generator are dissolved or dispersed. And what can be volatilized and removed after application | coating can be used suitably. For example, water; aromatic hydrocarbons such as toluene and xylene; ketones such as methyl ethyl ketone and cyclohexanone; amides such as N, N-dimethylformamide, N, N-dimethylacetamide and N-methylpyrrolidone; ethylene glycol monomethyl ether; Ether alcohols such as ethylene glycol monoethyl ether, diethylene glycol monomethyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether; ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate, propylene glycol monomethyl ether acetate, propylene glycol monoethyl Ether acetates such as ether acetate; ethyl acetate, butyl acetate, isoacetic acid Chill, acetic esters such as methyl lactate ester; lactate ethyl ester, lactic esters such as lactic acid propyl ester, ethylene carbonate, propylene carbonate, and cyclic esters such as γ- butyrolactone. These solvents can be used alone or in combination of two or more.

  The proportion of the solvent used in the present invention is 5 to 90% by weight, preferably 10 to 80% by weight, based on the total amount of the black coloring material for black matrix, the transparent resin, and the polyfunctional monomer and photopolymerization initiator. is there. If it is less than 5% by weight, it is difficult to form a uniform film because of its high viscosity. When it is 90% by weight or more, the coating film becomes thin, and it becomes difficult to obtain a black matrix having a sufficient optical density.

<Dispersant>
Examples of the dispersant in the present invention include anionic surfactants such as ammonium lauryl sulfate and polyoxyethylene alkyl ether sulfate triethanolamine, cationic surfactants such as stearylamine acetate and lauryltrimethylammonium chloride, lauryldimethylamine oxide, and lauryl. One or more amphoteric surfactants such as carboxymethylhydroxyethylimidazolium betaine, and nonionic surfactants such as polyoxyethylene lauryl ether, polyoxyethylene stearyl ether, and sorbitan monostearate can be used. .

  In particular, when the solvent is water, anionic surfactants, nonionic surfactants, cationic surfactants, sodium naphthalene sulfonate formalin condensates, acetylene glycol dispersants and the like can be suitably used as the dispersant. .

  The viscosity of the black composition for black matrix according to the present invention 4 is preferably 0.5 to 800 mPa · s. When the viscosity exceeds 800 mPa · s, uniform coating becomes difficult. When it is less than 0.5 mPa · s, the coating film becomes too thin, which is not preferable.

  Further, the light transmittance at a wavelength of 555 nm of the black film obtained by using the black composition for black matrix according to the present invention 4 is preferably 2.0% or less in a film thickness range of 0.3 to 0.4 μm. More preferably, it is 1.5% or less.

  The black composition for black matrix according to the present invention 5 is obtained by adding a transparent resin to the black composition for black matrix of the present invention 4.

<Transparent resin>
The transparent resin in the present invention may be any resin as long as it satisfies the conditions that it is soluble in an alkali developer, does not have an absorption band in the visible wavelength region, and has film-forming ability. Examples of the transparent resin for this purpose include a polymer substituted with one or more acidic groups, or a polymer having one or more latent acidic groups that are converted into acidic groups by a deprotection reaction due to the action of an acid. The acidic group in the present invention is a phenolic hydroxyl group and a carboxyl group, and the amount introduced thereof may be appropriately adjusted depending on the solubility in an alkaline aqueous solution.

  Examples of the polymer having a phenolic hydroxyl group include novolak resins and 4-hydroxystyrene homopolymers and copolymers.

  The transparent resin having a carboxyl group is preferably a vinyl copolymer of an ethylenically unsaturated monomer and another copolymerizable unsaturated monomer. Examples of the monomer having a carboxyl group include acrylic acid, methacrylic acid, 2-acryloyloxyethyl phthalate, 2-acryloyloxypropyl phthalate, maleic acid, maleic anhydride, itaconic acid, and itaconic anhydride. Can do. Other monomers that copolymerize with these carboxyl group-containing monomers include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, butyl (meth) acrylate, and (meth) acrylic acid. Cyclohexyl, isobornyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, benzyl (meth) acrylate, phenyl (meth) acrylate, 2- (meth) acrylate 2- Ethoxyethyl, 2-phenoxyethyl (meth) acrylate, 2- (N, N-dimethylamino) ethyl (meth) acrylate, glycidyl (meth) acrylate, (meth) acrylonitrile, (meth) acrylamide, meta (a ) Cloyl morpholide, N-methylmaleimide, N-phenylmale De, N- cyclohexyl maleimide, styrene, 4-vinyl toluene, vinyl acetate, may be may be mentioned vinyl methyl ether, is not limited thereto.

  The molar ratio of the carboxyl group-containing monomer in the transparent resin is 0.005 to 0.5, preferably 0.05 to 0.4. When the copolymer has a molar ratio of less than 0.005, the solubility in an aqueous alkali solution is reduced, and background staining in patterning is likely to occur. On the other hand, at a molar ratio exceeding 0.5, when alkali development is performed after the coating film made of the resulting photosensitive composition is exposed, the insolubilized exposed portion swells, resulting in a decrease in resolution or coating. The smoothness of the film surface is impaired. The weight average molecular weight of the transparent resin is 2000 to 500000, preferably 3000 to 300000.

  As a transparent resin containing a carboxyl group, a polyamic acid obtained by a polyaddition reaction of tetracarboxylic dianhydride and diamine can be used. Examples of tetracarboxylic dianhydrides include 1,2,3,4-cyclobutanetetracarboxylic dianhydride, 1,2,3,4-cyclopentanetetracarboxylic dianhydride, 1,2,3,4 -Cyclopentanetetracarboxylic dianhydride, 1,2,4,5-bicyclehexene tetracarboxylic dianhydride, 3,3 ', 4,4'-benzophenone tetracarboxylic dianhydride, pyromellitic acid 2 Anhydride, 3,3 ′, 4,4′-diphenylsulfonetetracarboxylic dianhydride, 3,3 ′, 4,4′-biphenyltetracarboxylic dianhydride, and the like are exemplified, but are not limited thereto. It is not a thing. Moreover, 1 type (s) or 2 or more types can be used for these dianhydrides. Examples of diamines to be reacted with these dianhydrides include ethylenediamine, 1,3-diaminocyclohexane, 1,4-diaminocyclohexane, 4,4′-diaminodiphenyl ether, 3,4′-diaminodiphenyl ether, and 4,4′-diamino. Diphenylmethane, 3,3′-diaminodiphenylmethane, 4,4′-diaminodiphenylsulfone, 3,3′-diaminodiphenylsulfone, m-phenylenediamine, p-phenylenediamine, 2,4-diaminotoluene, 2,5-diamino Although toluene etc. can be mentioned, it is not limited to these.

  The synthesis of the polyamic acid is performed by a known method of tetracarboxylic dianhydride and diamine in a polar organic solvent, and the degree of polymerization of the polyamic acid can be adjusted by the mixing molar ratio.

  A transparent resin having a latent acidic group is a polymer having a substituent that generates a carboxyl group or a phenolic hydroxyl group by the catalytic action of an acid generated from a photoacid generator, and is used in an alkali developable chemically amplified photoresist. Base polymers can be utilized (see CP Wong, edited by Polymers for Electronic and Photonic Applications, Academic Press, p. 67 (1993)). For example, cyclohexyl (meth) acrylate, tert-butyl (meth) acrylate, tert-amyl (meth) acrylate, 1,1-dimethylbenzyl (meth) acrylate, 1-ethoxyethyl (meth) acrylate, and (meth) acrylic acid Copolymers with other acrylate monomers containing, homopolymers such as 4- (tert-butoxycarbonyloxy) styrene, 4- (1-methoxyethoxy) styrene, 4- (1-ethoxyethoxy) styrene, or 4-hydroxy Mention may be made of copolymers with styrene.

  The mixing ratio of the transparent resin substituted with these acidic groups and / or latent acidic groups with respect to the black coloring material for the black matrix is usually 5 to 500 parts by weight with respect to 100 parts by weight of the black coloring material for the black matrix. The amount is preferably 7 to 300 parts by weight. When the mixing ratio of the transparent resin is less than 5 parts by weight, the film forming property and alkali developability are deteriorated. When the amount exceeds 500 parts by weight, the pigment concentration relatively decreases, so that it is difficult to obtain a uniform film thickness by increasing the film thickness in order to ensure the optical density as a black matrix.

  The viscosity of the black composition for black matrix according to the present invention 5 is preferably 0.5 to 1000 mPa · s. If the viscosity exceeds 1000 mPa · s, uniform coating becomes difficult. When it is less than 0.5 mPa · s, the coating film becomes too thin, which is not preferable.

  The optical density (OD value) of the black matrix produced using the black composition for black matrix according to the present invention 5 is 3.00 or more, preferably 3.30 or more, more preferably 3.60 or more. The glossiness is preferably 80% or more, more preferably 85% or more, still more preferably 90% or more, and the surface roughness Ra is preferably 8.0 nm or less, more preferably 7%. .5 nm or less, still more preferably 7.0 nm or less.

  The black composition for a black matrix according to the present invention 6 is obtained by adding a photo-radical polymerization initiator and a polyfunctional monomer having two or more ethylenically unsaturated double bonds to the black composition for a black matrix according to the present invention 5 Made up of.

  The black composition for black matrix according to the present invention 7 comprises a black composition for black matrix according to the present invention 5 added with a photoacid generator.

<Polyfunctional monomer having two or more ethylenically unsaturated double bonds>
As the polyfunctional monomer having two or more ethylenically unsaturated double bonds in the present invention, ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, trimethyleneethylene glycol di (meth) acrylate, tetramethylene glycol di (Meth) acrylate, pentamethylene glycol di (meth) acrylate, hexamethylene glycol di (meth) acrylate, neopentyl glycol di (meth) acrylate, pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, stearic acid Modified pentaerythritol meta (a) acrylate, trimethylolpropane tri (meth) acrylate, tris (acryloyloxyethyl) isocyanurate, dipen Polyfunctional monomers such as dipentaerythritol hexa acrylate. Furthermore, the acrylate oligomer etc. which are obtained from a polyester resin, an epoxy resin, a urethane resin, a silicon resin etc. are mentioned.

  A monofunctional monomer can be mixed with these polyfunctional monomers. Monofunctional monomers include methoxytriethylene glycol (meth) acrylate, 2-hydroxy-3-phenoxypropyl (meth) acrylate, 2-acryloyloxyethyl succinate, 2-acryloyloxyethyl phthalate, 2-acryloyloxy And propyl phthalate. These monofunctional monomers are 0 to 80% by weight, preferably 0 to 40% by weight, based on 100 parts by weight of the polyfunctional monomer. When the monofunctional monomer is mixed beyond this range, when the exposed film is subjected to an alkali development treatment, the film is partially peeled or the resolution is lowered.

  The polyfunctional monomer in the present invention is preferably mixed with a vinyl copolymer having a carboxyl group, among the above-described transparent resins. The usage ratio of the polyfunctional monomer is 5 to 300 parts by weight, more preferably 10 to 200 parts by weight, based on 100 parts by weight of the transparent resin. When the mixing ratio of the polyfunctional monomer is less than 5 parts by weight, a part of the coating film after alkali development is peeled off or the resolution is lowered. When the mixing ratio exceeds 300 parts by weight, the alkali developability deteriorates, causing problems such as background contamination and film residue in unexposed areas.

<Photopolymerization initiator>
The photopolymerization initiator in the present invention is a substance that efficiently generates radical species by light irradiation, and this initiates polymerization of the above-described polyfunctional monomer to form a crosslinked structure, and is a transparent resin having an acidic group. A negative image is provided by a decrease in alkali solubility. Examples of the photopolymerization initiator include ketone compounds, triazine compounds having a trichloromethyl group, electron transfer initiators, and the like. Polymerization initiators that generate radical species by ultraviolet rays in the range of 200 to 450 nm include Selected.

  Examples of ketone photopolymerization initiators include 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxy-1-benzoylcyclohexane, 2-morpholino-2-methyl-1-phenylpropane-1- ON, 2-morpholino-2-methyl-1- (4-methoxyphenyl) propan-1-one, 2-morpholino-2-methyl-1- (4-methylthiophenyl) propan-1-one, 2-benzyl- 2-dimethylamino-1- (4-morpholinophenyl) butan-1-one, 2-phenyl-2,2-dimethoxy-1- (4-methylthiophenyl) ethane-1-one, diphenylmesitylenephosphine oxide, phenacyltetra Examples include methylenesulfonium hexafluorophosphate.

  Examples of triazine derivatives having a trichloromethyl group include 2- (4-methoxy-β-styryl) -bis (4,6-trichloromethyl) -s-triazine, 1-phenyl-3,5-bis (trichloromethyl)- s-triazine, 1- (4-chlorophenyl) -3,5-bis (trichloromethyl) -s-triazine, 1- (4-methoxyphenyl) -3,5-bis (trichloromethyl) -s-triazine, 1 -(4-butoxyphenyl) -3,5-bis (trichloromethyl) -s-triazine, 1- (3,4-methylenedioxyphenyl) -3,5-bis (trichloromethyl) -s-triazine, 1 -(3,4-dimethoxyphenyl) -3,5-bis (trichloromethyl) -s-triazine, 1- (4-methoxynaphthyl-1) -3,5-bis ( Lichloromethyl) -s-triazine, 1- {2- (4-methoxyphenyl) ethenyl} -3,5-bis (trichloromethyl) -s-triazine, 1- {2- (2-methoxyphenyl) ethenyl} -3 , 5-bis (trichloromethyl) -s-triazine, 1- {2- (3,4-dimethoxyphenyl) ethenyl} -3,5-bis (trichloromethyl) -s-triazine, 1- {2- (3 -Chloro-4-methoxyphenyl) ethenyl} -3,5-bis (trichloromethyl) -s-triazine, 1- (biphenyl-1) -3,5-bis (trichloromethyl) -s-triazine and the like. .

  The electron transfer type initiator comprises a radical generator and a sensitizer as an electron accepting compound or an electron donating compound. Examples of the electron-accepting compound include the trichloromethyl-substituted triazine derivatives, 2,2′-bis (2-chlorophenyl) -4,4 ′, 5,5′phenylbiimidazole, and 2,2′-bis (2,4 -Dichlorophenyl) -4,4 ′, 5,5′phenylbiimidazole, 2,2′-bis (2-chlorophenyl) -4,4 ′, 5,5′tetrakis (4-ethoxycarbonylphenyl) biimidazole, etc. Examples include iodonium salts such as biimidazole compounds, diphenyliodonium hexafluorophosphate, bis (4-tert-butylphenyl) iodonium hexafluorophosphate, (4-methoxyphenyl) (4-octyloxyphenyl) iodonium hexafluorophosphate, and the like. . As the sensitizer, 9,10-dimethylanthracene, 9,10-diphenylanthracene, 9,10-bis (phenylethynyl) anthracene, 1,8-dimethyl-9,10-bis (phenylethynyl) anthracene, 9, Examples include 10-dimethoxyanthracene, 9,10-diethoxyanthracene, 9,10-dipropoxyanthracene, 9,10-dibutoxyanthracene, thioxanthone, isopropylthioxanthone, 4,4′-bis (diethylamino) benzophenone. Furthermore, a photopolymerization initiator composed of an electron donating compound and a sensitizer can be used. Examples of the electron donor include p-dimethylaminobenzoate and diethanolamine, and a thioxanthone derivative is preferably used as the sensitizer. One or more of the above sensitizers can be used in combination with the electron accepting compound or electron donating compound.

<Photo acid generator>
As the photoacid generator in the present invention, a compound having an absorption in the range of 200 to 430 nm is used among chemical amplification type photoresists and compounds used for photocationic polymerization (edited by Organic Electronics Materials Research Group, “Imaging”). Organic materials for use ", Bunshin Publishing (1993), pages 187 to 192), onium cation compounds, halogen-containing compounds that generate hydrohalic acid, and sulfonated compounds that generate sulfonic acid. Examples of onium salts include p-phenylthiophenyldiphenylsulfonium, phenacyltetramethylenesulfonium, phenacyldimethylsulfonium, (2-naphthylcarbonylmethyl) tetramethylenesulfonium, phenyl (4-methoxyphenyl) iodonium, phenyl {4- (tert - butyl) phenyl} iodonium, (4- bis {4- (tert-butyl) phenyl} iodonium, bis (4-dodecylphenyl) _BF of iodonium ^{_{4 -, PF 6 -, AsF}} 6 -, SbF 6 -, CH ₃ SO ₃ ⁻ , CF ₃ SO ₃ ⁻ , perfluorobutane sulfonate, benzene sulfonate, p-toluene sulfonate, and (C ₆ F ₅ ) ₄ B ^- salt. -(3 4-dimethoxyphenyl) -3,5-bis (trichloromethyl) -s-triazine, 1- (4-methoxynaphthyl-1) -3,5-bis (trichloromethyl) -s-triazine, 1- {2- (4-methoxyphenyl) ethenyl} -3,5-bis (trichloromethyl) -s-triazine, 1- {2- (2-methoxyphenyl) ethenyl} -3,5-bis (trichloromethyl) -s-triazine 1- {2- (3,4-dimethoxyphenyl) ethenyl} -3,5-bis (trichloromethyl) -s-triazine, 1- {2- (3-chloro-4-methoxyphenyl) ethenyl} -3 , 5-bis (trichloromethyl) -s-triazine, 1- (biphenyl-1) -3,5-bis (trichloromethyl) -s-triazine, 1- (4-hydroxybiphenyl) -1) -3,5-bis (trichloromethyl) -s-triazine, 1- (4-methoxybiphenyl-1) -3,5-bis (trichloromethyl) -s-triazine, and the like. Examples of the acid generator to be generated include N-trifluoromethanesulfonyloxydiphenylmaleimide, Np-toluenesulfonyloxysuccinimide, N-camphorsulfonyloxysuccinimide, N-trifluoromethanesulfonyloxysuccinimide, N-perfluorobutane Sulfonyloxyphthalimide, Np-toluenesulfonyloxy-1,8-naphthalenecarboximide, N-camphorsulfonyloxy-1,8-naphthalenecarboximide, N-trifluoromethanesulfonyloxy-1,8-naphthalenecarboxyimi , N- perfluorobutane sulfonyloxy-1,8-naphthalene dicarboximide and the like.

  These photoacid generators can be used alone or in the presence of a sensitizer shown below. Sensitizers include 9-methylanthracene, 9,10-dimethylanthracene, 9,10-diphenylanthracene, 9,10-dimethoxyanthracene, 9,10-diethoxyanthracene, 9,10-dipropoxyanthracene, 9, Examples include 10-dibutoxyanthracene, 1-methylpyrene, thioxanthone derivatives, and the like.

  The viscosity of the black composition for black matrix according to the present invention 6 and 7 is preferably 0.5 to 1000 mPa · s. If the viscosity exceeds 1000 mPa · s, uniform coating becomes difficult. When it is less than 0.5 mPa · s, the coating film becomes too thin, which is not preferable.

  The optical density (OD value) of the black matrix produced using the black composition for black matrix according to the present invention 6 and 7 is 3.00 or more, preferably 3.30 or more, more preferably 3.60 or more. is there. The glossiness is preferably 80% or more, more preferably 85% or more, still more preferably 90% or more, and the surface roughness Ra is preferably 8.0 nm or less, more preferably 7%. .5 nm or less, still more preferably 7.0 nm or less.

  Next, a color filter using the black coloring material for black matrix according to the present invention will be described.

  The color filter according to the present invention comprises a black matrix layer formed on a transparent substrate, and organic pigments such as R (red), G (green), and B (blue) for color display dispersed in a resin. It is comprised from a transparent coloring layer or / and a transparent conductive film (ITO). In addition, you may form a transparent protective film on a colored layer as needed. In the case of a display device in which liquid crystal is driven by a lateral electric field, the ITO transparent conductive film can be omitted.

  As the organic pigment in the present invention, organic pigments exhibiting red, green, blue or cyan, magenta and yellow colors can be used. In order to improve the spectral characteristics of the organic pigment, an organic pigment having another hue such as a purple organic pigment which is a complementary color of blue may be used in combination.

  Red organic pigments include quinacridone pigments such as quinacridone red, azo pigments such as permanent red, condensed azo pigments such as condensed azo red, vat dyes such as dianthraquinonyl red, diketopyrrolopyrrole pigments, and the like Perylene pigments such as perylene red can be used. As the green organic pigment, a phthalocyanine pigment such as phthalocyanine green can be used. As the blue organic pigment, phthalocyanine pigments such as metal-free phthalocyanine blue, phthalocyanine blue, and fast sky blue, and alkali blue can be used. As the yellow organic pigment, monoazo pigments such as Hansa Yellow, disazo pigments such as benzidine yellow and permanent yellow, condensed azo pigments such as condensed azo yellow, and isoindoline pigments such as isoindoline yellow can be used. As the purple organic pigment, a dioxazine pigment such as dioxazine violet can be used. The organic pigment used in the present invention is not limited to the pigments exemplified above. In order to obtain higher transparency, an organic-inorganic composite pigment in which the organic pigment is attached to the surface of white inorganic fine particles may be used.

  The color filter according to the present invention has a light transmittance of 80% or more, preferably 83% or more, and more preferably 86% or more in the transmission region of each color. Further, the contrast is preferably 1,600 or more, more preferably 1,800 or more, and even more preferably 2,000 or more.

  Next, the manufacturing method of the black coloring material for black matrices concerning this invention is described.

  The black coloring material for a black matrix according to the present invention is a mixture of carbon black and a surface treatment agent, and at least a part of the carbon black particle surface is coated with the surface treatment agent, and then the carbon coated with the surface treatment agent. It can be obtained by mixing black with a pigment derivative and / or an organic pigment.

  In the present invention, the coating of the surface of the carbon black particles with the surface treatment agent is performed by mechanically mixing and stirring the carbon black and the surface treatment agent or the solution of the surface treatment agent. Mixing and stirring may be performed mechanically while spraying. Almost all of the added surface treatment agent is coated on the surface of the carbon black particles.

  As a device for mixing and stirring carbon black and a surface treatment agent, and mixing and stirring pigment derivatives and / or organic pigments and carbon black whose surface is coated with a surface treatment agent, a shear force is applied to the powder layer. In particular, a device capable of simultaneously performing shearing, spatula and compression, for example, a wheel-type kneader, a ball-type kneader, a blade-type kneader, or a roll-type kneader can be used. A wheel kneader can be used more effectively.

  Examples of the wheel type kneader include edge runners (synonymous with “mix muller”, “simpson mill”, “sand mill”), multi-mal, stotz mill, wet pan mill, conner mill, ring muller, etc. Are edge runners, multi-mals, stotz mills, wet pan mills and ring mullers, more preferably edge runners. Examples of the ball kneader include a vibration mill. Examples of the blade-type kneader include a Henschel mixer, a planetary mixer, and a nauter mixer. Examples of the roll-type kneader include an extruder.

  The condition during mixing and stirring of the carbon black and the surface treatment agent was such that the line load was 19.6 to 1960 N / cm (2 to 200 Kg / cm so that the surface treatment agent was coated as uniformly as possible on the particle surface of the carbon black. ), Preferably 98 to 1470 N / cm (10 to 150 Kg / cm), more preferably 147 to 980 N / cm (15 to 100 Kg / cm), and the treatment time is 5 minutes to 24 hours, preferably 10 minutes to 20 hours. Adjust it within the range. The stirring speed may be adjusted in the range of 2 to 2000 rpm, preferably 5 to 1000 rpm, more preferably 10 to 800 rpm.

  The addition amount of the surface treatment agent is preferably 0.15 to 45 parts by weight with respect to 100 parts by weight of carbon black. With an addition amount of 0.15 to 45 parts by weight, 0.5 to 50 parts by weight of a pigment derivative and / or an organic pigment can be present with respect to 100 parts by weight of carbon black.

  After the surface treatment agent is coated on the surface of the carbon black particles, a pigment derivative and / or an organic pigment is added and mixed and stirred to attach or coat the pigment derivative and / or organic pigment on the surface of the surface treatment agent-coated carbon black particles. . If necessary, drying or heat treatment and / or pulverization / classification may be performed.

  The pigment derivative and / or the organic pigment is added in small portions over a period of time, particularly 5 minutes to 24 hours, preferably 5 minutes to 20 hours, or with respect to 100 parts by weight of carbon black. It is preferable to add 5 to 25 parts by weight of the pigment derivative and / or the organic pigment in portions until a desired addition amount is obtained. Moreover, when adding a pigment derivative and an organic pigment, you may mix a pigment derivative and an organic pigment previously, and you may add separately. When adding separately, either may be first.

  The condition during mixing and stirring is such that the linear load is 19.6 to 1960 N / cm (2 to 200 Kg / cm), preferably 98 to 1470 N so that the pigment derivative and / or the organic pigment is present as uniformly as possible on the particle surface. / Cm (10 to 150 Kg / cm), more preferably 147 to 980 N / cm (15 to 100 Kg / cm), treatment time is suitably 5 minutes to 24 hours, preferably 10 minutes to 20 hours. do it. In addition, what is necessary is just to adjust process conditions suitably in the range of stirring speed 2-2000rpm, Preferably 5-1000rpm, More preferably, it is 10-800rpm.

  The addition amount of the pigment derivative and / or the organic pigment is 0.05 to 50 parts by weight, preferably 0.1 to 40 parts by weight, more preferably 100 parts by weight of carbon black as the total amount of the pigment derivative and the organic pigment. Is 0.2 to 30 parts by weight. When the addition amount of the pigment derivative and / or the organic pigment is out of the above range, the intended black coloring material for black matrix cannot be obtained.

  In the case of performing drying or heat treatment, the heating temperature is usually preferably 40 to 150 ° C, more preferably 60 to 120 ° C, and the heating time is preferably 10 minutes to 12 hours, more preferably 30 minutes to 3 hours. .

  As an apparatus for pulverizing the obtained black coloring material for black matrix, it is preferable to use a fine pulverizer or an ultrafine pulverizer, such as a roller mill, an impact pulverizer, a ball mill, a stirring mill, a jet pulverizer, etc. Is preferably used. Jet crushers and impact crushers can be used more effectively.

  Examples of the jet pulverizer include a swirl type jet mill and a fluidized bed type jet mill, and a fluidized bed type jet mill is preferable. Examples of the impact pulverizer include a hammer mill, a pin mill, a screen mill, a turbo mill, and a centrifugal classification mill, and a pin mill is preferable. Examples of the roller mill include a ring roller mill and a centrifugal roller mill. Examples of the ball mill include a rolling ball mill, a vibration ball mill, and a planetary mill. Examples of the agitation mill include an agitation tank type mill, a flow tube type mill and an annular mill.

  As an apparatus for classifying the black coloring material for the black matrix after pulverization, a dry classifier is preferably used. For example, a gravity classifier, an inertia classifier, a centrifugal classifier, or the like is preferably used. Centrifugal classifier can be used more effectively.

  Examples of the centrifugal classifier include cyclone, clacyclon, startevant type, micron separator, turboplex, tabo classifier, super separator, dispersion separator, etc., preferably turboplex and micron separator. As the gravity classifier, there are a horizontal flow type, a vertical flow type, and an inclined flow type. As the inertia classifier, there are a linear type, a curved type, and an inclined type.

  Next, a method for producing the black composition for black matrix according to the present invention will be described.

  In order to produce the black composition for black matrix of the present invention 4, the black coloring material for black matrix and the dispersing agent are mixed and dispersed in the solvent. For mixing / dispersing, a ball mill, a bead mill, a sand mill, an edge runner, a two or three roll mill, an extruder, a high-speed impact mill, or the like can be used. As the grinding media used in the grinding mill, steel beads, glass beads, ceramic beads, etc. can be used depending on the material of the mill, and the size is preferably in the range of 0.01 to 10 mm, 0.03 A range of ˜3 mm is more preferable. The grinding temperature is not particularly limited and may be in the range from room temperature to the boiling point of the solvent.

  In order to prepare the black composition for black matrix of the present invention 5, a transparent resin having an acidic group or a transparent resin having a latent acidic group may be dissolved in the black composition of the present invention 4. Alternatively, the black coloring material for black matrix can be mixed and dispersed using a solvent in which a transparent resin having an acidic group or a transparent resin having a latent acidic group is previously dissolved.

  In order to prepare the black composition for black matrix imparted with photosensitivity according to the present invention 6, the black composition containing the transparent resin having an acidic group according to the present invention 5 is added to the photopolymerization initiator and the ethylenically unsaturated dimer. A polyfunctional monomer having two or more heavy bonds may be added and mixed. In this case, if necessary, a solvent can be added to adjust the pigment concentration, viscosity, and the like. Furthermore, a curing accelerator such as a polymerization inhibitor and 2-mercaptobienimidazole can be used as necessary.

  In order to prepare the black composition for black matrix imparted with photosensitivity according to the present invention 7, a photoacid generator is added to and mixed with the black composition containing the transparent resin having a latent acidic group according to the present invention 5. do it.

  Next, a method for producing a color filter according to the present invention will be described.

  The color filter according to the present invention is prepared by applying a transparent coloring composition composed of R (red), G (green), and B (blue) for color display on a transparent substrate on which a black matrix pattern is formed, and then pre-baking. The solvent is sufficiently removed by the treatment to obtain a colored coating film. In the case of a colored coating film not imparted with photosensitivity, a positive photoresist layer capable of alkali development is provided on the film to obtain a coating film having a two-layer structure. As the alkali developable positive photoresist, a quinonediazide-based photoresist is preferably used. The colored coating film is irradiated with light through a photomask and then developed with an alkaline aqueous solution. Since the exposed portion of the coating film coated with the positive photoresist layer becomes alkali-soluble, the exposed colored layer is also etched with an alkaline solution to form a colored positive image. Next, the photoresist layer is selectively removed with a solvent to obtain a colored pattern. On the other hand, in the case of a photosensitive transparent coloring composition to which a photopolymerization initiator and a polyfunctional monomer are added, a coating film prepared therefrom is used as it is as a colored photosensitive layer. Similarly, if alkali development is performed after exposure through a photomask, the exposed portion is insolubilized and a negative colored pattern can be obtained. For the development treatment, an immersion method, a spray method, a paddle method, a shower method, or the like is used. After alkali development, the substrate is washed with water and dried.

  As a transparent substrate for producing a color filter, polycarbonate, polyester, polyamide, polyimide, polyamideimide, or the like can be used in addition to silica glass. A silicon substrate can also be used for manufacturing a solid-state imaging device. In order to apply the transparent coloring composition onto these transparent substrates, methods such as spin coating, cast coating, roll coating, and screen printing can be appropriately used. Although the thickness of a coating film is dependent also on the density | concentration of the organic pigment in a transparent coloring composition, it is 0.1-10 micrometers, Preferably it is 0.2-5.0 micrometers.

  As the alkaline developer, an aqueous solution of sodium carbonate, potassium carbonate, sodium hydroxide, potassium hydroxide, tetramethylammonium hydroxide or the like is preferable. Methanol, ethanol, isopropyl alcohol, a surfactant and the like can also be added to the alkaline aqueous solution.

<Action>
The most important point in the present invention is that at least a part of the particle surface of the carbon black particle powder is coated with a surface treatment agent, and the surface of the surface treatment agent-coated carbon black particle has a pigment derivative and / or an organic pigment. This is the fact that a black matrix obtained by using a black coloring material for black matrix having excellent surface smoothness and light-shielding property and having a high optical density.

  As a reason why the black matrix obtained using the black composition for black matrix according to the present invention has a high optical density, the present inventor considers as follows. When the fine carbon black that normally behaves as an aggregate due to the fine particles is the black coloring material for black matrix according to the present invention, the pigment derivative and / or the organic pigment is a carbon black surface treatment agent. By being firmly attached or coated on the coating layer, a high dispersibility improving effect can be obtained without the pigment derivative and / or the organic pigment being detached from the particle surface. Therefore, the black coloring material for black matrix according to the present invention is uniformly dispersed without aggregation in the black composition for black matrix, and the content of the black coloring material per unit volume in the black matrix may be increased. it can.

  Hereinafter, the present invention will be described in detail with reference to examples.

  The average particle diameter of each particle powder was measured by measuring the particle diameter of 350 particles shown in the electron micrograph, and the average value was shown.

  The specific surface area value was indicated by a value measured by the BET method.

  The coating amount of the surface treatment agent coated on the surface of the carbon black particles uses “fluorescence X-ray analyzer 3063M type” (manufactured by Rigaku Corporation) for the metal elements contained in each surface treatment agent, The measurement was performed according to “General X-ray fluorescence analysis rules” of JIS K0119.

  The coating amount of the organic pigment and pigment derivative coated on the surface of the carbon black particles is determined by measuring the carbon amount using a “Horiba Metal Carbon / Sulfur Analyzer EMIA-2200” (manufactured by Horiba, Ltd.). Asked.

  The desorption rate (%) of the pigment derivative and / or the organic pigment adhered or coated on the surface of the carbon black particles was indicated by the value obtained by the following method. The closer the organic pigment / pigment derivative desorption rate (%) is to 0, the smaller the amount of desorption of the pigment derivative and / or organic pigment from the particles.

  2 g of the measured particle powder and 20 ml of propylene glycol monomethyl ether acetate were placed in a 50 ml Erlenmeyer flask, subjected to ultrasonic dispersion for 60 minutes, and then allowed to stand for 3 days to allow the measured particle powder to settle and collect the supernatant. . Next, the light transmittance of the obtained supernatant was measured using “Self-recorded photoelectric spectrophotometer UV-2100” (Shimadzu Corporation), and each pigment derivative or each organic pigment in propylene glycol monomethyl ether acetate calculated in advance. From the calibration curve of the concentration of light and the light transmittance, the concentration of the detached pigment derivative and / or organic pigment present in propylene glycol monomethyl ether acetate is calculated, and the value obtained according to the following formula 1 is the organic pigment / pigment derivative The desorption rate (%).

<Equation 1>
Desorption rate of pigment derivative / organic pigment (%) = {(Wa-We) / Wa} × 100
Wa: Carbon black pigment derivative and / or organic pigment adhesion amount We: Carbon black pigment derivative and / or organic pigment adhesion amount after desorption test

The blackness of the black coloring material for carbon black and black matrix is obtained by kneading 0.5 g of a sample and 0.5 ml of castor oil with a Hoover type Mahler to form a paste, adding 4.5 g of clear lacquer to this paste, kneading and coating An application piece (coating thickness: about 30 μm) coated on a cast coated paper using a 150 μm (6 mil) applicator was prepared, and “spectral colorimeter CM-3610d” (manufactured by Minolta Co., Ltd.) was prepared. ) And measured by the lightness L ^* value in the CIE Lab color space display system.

The hue of the organic pigment was kneaded with 0.5 g of a sample and 0.5 ml of castor oil with a Hoover type Mahler to form a paste, and 4.5 g of clear lacquer was added to the paste, and the mixture was kneaded and coated to 150 μm on the clear film ( 6 mil) is applied using an applicator (coating thickness: about 30 μm), and a standard white plate is used as the back for the applied piece, “spectral colorimeter CM-3610d” (manufactured by Minolta Co., Ltd.) The color index L ^* value, a ^* value, b ^* value and C ^* value in the CIE Lab color space display system were used. The C ^* value represents saturation and can be obtained according to the following formula 2.

<Equation 2>
C ^* value = ((a ^* value) ² + (b ^* value) ² ) ^1/2

  The hiding power of the black coloring material for carbon black and black matrix was shown by the value obtained according to the cryptometer method of JIS K 5101 8.2 using the primary color enamel produced according to the method described below.

Production of primary color enamel:
10 g of the above sample powder, 16 g of amino alkyd resin and 6 g of thinner were mixed and added to a 140 ml glass bottle together with 90 g of 3 mmφ glass beads, and then mixed and dispersed for 45 minutes with a paint shaker, and then 50 g of amino alkyd resin was added. Further, it was dispersed with a paint shaker for 5 minutes to produce a primary color enamel.

The viscosity of the black composition for black matrix was determined by measuring the viscosity at 25 ° C. of the obtained composition using “E-type viscometer EMD-R” (manufactured by Tokyo Keiki Co., Ltd.), and the shear rate D = 1. The value is shown at 92 sec ⁻¹ .

  The optical density of the black matrix is obtained by printing a black composition for black matrix prepared on the basis of the formulation described later on a non-alkali glass substrate, and measuring the light transmittance at 555 nm of the obtained black matrix layer by referring to “Self-recorded photoelectric spectrophotometer UV -2100 "(manufactured by Shimadzu Corporation), and after calculating the optical density OD value according to the following formula 3, it was converted to the optical density (OD value) per 1 μm of film thickness.

<Equation 3>
Optical density (OD value) = log (1 / T)
T: Light transmittance at 555 nm (%)

  The glossiness of the black matrix was indicated by the glossiness at an incident angle of 60 ° using the “Glossmeter UGV-5D” (manufactured by Suga Test Instruments Co., Ltd.). It shows that the dispersibility of the black composition for black matrices which mix | blended the black coloring material for black matrices is excellent, so that glossiness is high.

  The surface roughness Ra of the black matrix was determined by measuring the centerline average roughness using “Surfcom-575A” (manufactured by Tokyo Seimitsu Co., Ltd.).

  The light transmittance of the black film obtained by using the black coloring material (I) for the black matrix was determined by using a black film produced by the method described later, and the light transmittance at a wavelength of 555 nm, as described in “Self-recording photoelectric spectrophotometer”. It measured using "UV-2100" (made by Shimadzu Corporation).

  For the light transmittance of the color filter, the light transmittance of each wavelength of 620 nm, 540 nm, and 460 nm was measured using a color filter produced by the method described below, and “Self-recorded photoelectric spectrophotometer UV-2100” (manufactured by Shimadzu Corporation) ).

  The contrast of the color filter is the brightness when the color filter produced by the method described later is sandwiched between two polarizing plates on the backlight and the direction of the polarizing plate is parallel (A) and crossed. (B) was measured and indicated as (A) / (B).

<Manufacture of black coloring material for black matrix>
Example 1-1
Carbon black particles 1 (type: carbon black, particle shape: granular, average particle diameter 0.084 μm, BET specific surface area value 30.6 m ² / g, blackness L ^* value 27.15, hiding power 11,100 cm ² / g ) To 5.0 kg, 25 g of methyl hydrogen polysiloxane (trade name: TSF484: manufactured by GE Toshiba Silicone Co., Ltd.) is added to carbon black while operating the edge runner, and a linear load of 588 N / cm (60 Kg / cm). The mixture was stirred for 30 minutes. The stirring speed at this time was 22 rpm.

  Next, 200 g of pigment derivative 1 (kind: phthalocyanine derivative, functional group: sulfonic acid group) is added over 30 minutes while operating the edge runner, and further for 60 minutes with a linear load of 588 N / cm (60 Kg / cm). After mixing and stirring to adhere or coat the pigment derivative, heat treatment was performed at 105 ° C. for 60 minutes using a dryer to obtain a black coloring material for a black matrix. The stirring speed at this time was 22 rpm.

The obtained black coloring material for black matrix was granular particles having an average particle diameter of 0.084 μm. The BET specific surface area value was 25.8 m ² / g, the blackness L ^* value was 26.76, the hiding power was 12,300 cm ² / g, and the desorption rate of the pigment derivative was 1.6%. The coating amount of siloxane was 0.21% by weight in terms of Si, and the amount of adhering pigment derivative was 2.63% by weight in terms of C (corresponding to 4 parts by weight with respect to 100 parts by weight of carbon black). It was.

<Production of black composition (I) for black matrix>
Example 2
The black coloring material for black matrix, the dispersant (basic comb type polymer) and propylene glycol monomethyl ether acetate were dispersed using a bead mill at the following composition ratio to obtain a black composition (I) for black matrix.

100.0 parts by weight of black coloring material for black matrix,
50.0 parts by weight of a dispersant (basic comb type polymer),
(Product name: Solsperse 24000: manufactured by Avicia Corporation)
Phthalocyanine pigment derivative 10.0 parts by weight,
(Product name: Solsperse 5000: manufactured by Avicia Co., Ltd.)
340.0 parts by weight of propylene glycol monomethyl ether acetate.

  The viscosity of the obtained black composition for black matrix (I) was 7.6 mPa · s.

  Next, in order to evaluate the light transmittance, 120.0 parts by weight of propylene glycol monomethyl ether acetate is further added to the black composition for black matrix (I) and dispersed using a bead mill, and then a non-alkali glass substrate. The film was spin-coated on (thickness 0.7 mm) and prebaked at 90 ° C. for 4 minutes using a hot plate.

  The resulting black film had a light transmittance of 0.82% at 555 nm.

<Production of black composition (II) for black matrix>
Example 3
The black composition for black matrix (I) and the methyl methacrylate / methacrylic acid copolymer were dispersed using a sand grinder at the following composition ratio, and the obtained kneaded product was filtered through a 5 μm glass filter.

Black composition for black matrix (I) 500.0 parts by weight,
Methyl methacrylate / methacrylic acid copolymer 100.0 parts by weight.

  The viscosity of the obtained black composition for black matrix (II) was 5.8 mPa · s.

<Preparation of black matrix (II)>
The black composition for black matrix (II) was spin-coated on a non-alkali glass substrate (thickness 0.7 mm), prebaked at 90 ° C. for 4 minutes using a hot plate, and then positively coated on the film. A type photoresist was applied and dried by heating at 80 ° C. for 20 minutes to obtain a resist film. Using an ultrahigh pressure mercury lamp 2.50 kW, exposure was performed with a light amount of 400 mJ / cm ² . Next, after developing with an aqueous sodium carbonate solution, the photoresist layer that became unnecessary was peeled off with methyl cellosolve acetate. Further, the obtained black film was heat-treated at 250 ° C. for 30 minutes in a nitrogen atmosphere to obtain a black matrix (II).

  The obtained black matrix (II) had an optical density (OD) of 3.92, a glossiness of 102%, and a surface roughness Ra of 5.8 nm.

<Production of black composition (III) for black matrix>
Example 4-1
The black composition for black matrix (II), dipentaerythritol pentaacrylate and a polymerization initiator (2- (4-methoxy-β-styryl) -bis (4,6-trichloromethyl) -s-triazine) are as follows: The mixture was dispersed using a sand grinder at a ratio, and the obtained kneaded product was filtered through a 1 μm glass filter.

480.0 parts by weight of black composition for black matrix (II),
100.0 parts by weight of dipentaerythritol pentaacrylate,
2- (4-Methoxy-β-styryl) -bis (4,6-trichloromethyl) -s-triazine 5.0 parts by weight.

  The resulting black composition (III) for black matrix had a viscosity of 10.3 mPa · s.

<Preparation of black matrix (III)>
1. The black composition (III) for black matrix is spin-coated on a non-alkali glass substrate (thickness 0.7 mm), prebaked at 90 ° C. for 4 minutes using a hot plate, Using 50 kW, pattern exposure was performed with a light amount of 400 mJ / cm ² . Next, development was performed with an aqueous sodium carbonate solution to remove the unexposed photoresist layer, and the resulting colored film was heat-treated at 250 ° C. for 30 minutes in a nitrogen atmosphere to obtain a black matrix (III). .

  The obtained black matrix (III) had an optical density (OD) of 3.96, a glossiness of 105%, and a surface roughness Ra of 5.6 nm.

<Production of black composition (IV) for black matrix>
Example 5
The black composition for black matrix (II), dipentaerythritol pentaacrylate and a polymerization initiator (p-phenylthiophenyldiphenylsulfonium trifluoroacetate) were dispersed using a sand grinder at the following composition ratio, and the resulting kneaded product Was filtered through a 1 μm glass filter.

480.0 parts by weight of black composition for black matrix (II),
100.0 parts by weight of dipentaerythritol pentaacrylate,
p-Phenylthiophenyldiphenylsulfonium trifluoroacetate
5.0 parts by weight.

  The viscosity of the obtained black composition for black matrix (IV) was 10.5 mPa · s.

<Preparation of black matrix (IV)>
A black matrix (IV) was obtained in the same manner as the black matrix (III) except that the black composition (IV) for black matrix was used as the black composition for black matrix.

  The obtained black matrix (IV) had an optical density (OD) of 3.93, a glossiness of 103%, and a surface roughness Ra of 5.8 nm.

<Production of color filter>
Example 6-1
On a black matrix (III) formed on a non-alkali glass substrate (thickness 0.7 mm), a transparent black composition (G) produced by the composition described later is spin-coated, and a hot plate is placed at 90 ° C. for 4 minutes. After pre-baking, pattern exposure was performed using an ultra-high pressure mercury lamp 2.50 kW with a light amount of 400 mJ / cm ² . Next, development with an aqueous solution of sodium carbonate is performed to remove the unexposed portion of the photoresist layer, and the resulting colored film is further heated at 250 ° C. for 30 minutes in a nitrogen atmosphere to form a pattern of the colored film (G). Obtained.

  Then, similarly, the pattern of each colored film was formed using the transparent black composition (B) and the transparent black composition (R).

  The transmittance of the obtained color filter was 92.7% at a wavelength of 620 nm, 91.0% at a wavelength of 540 nm, 90.2% at a wavelength of 460 nm, and the contrast was 2,240.

<Manufacture of transparent black composition (G)>
The color pigment G-1, propylene glycol monomethyl ether acetate and a dispersant (basic comb type polymer) were kneaded using a three-roll mill at the following composition ratio.

Color pigment G-1 100.0 parts by weight,
50.0 parts by weight of propylene glycol monomethyl ether acetate,
20.0 parts by weight of a dispersant (basic comb type polymer),
(Product name: Solsperse 24000: manufactured by Avicia Corporation).

  To the obtained kneaded product, 230.0 parts by weight of propylene glycol monomethyl ether acetate was further added and dispersed using a bead mill to obtain a transparent black composition (IG).

  The transparent black composition (IG) and methyl methacrylate / methacrylic acid copolymer were dispersed using a sand grinder at the following composition ratio to obtain a transparent black composition (II-G).

400.0 parts by weight of a transparent black composition (IG),
Methyl methacrylate / methacrylic acid copolymer 100.0 parts by weight.

  The transparent black composition (II-G), dipentaerythritol pentaacrylate and the polymerization initiator 2- (4-methoxy-β-styryl) -bis (4,6-trichloromethyl) -s-triazine were used in the following composition ratios. A transparent black composition (G) was obtained by dispersing using a sand grinder and filtering the resulting kneaded product with a 1 μm glass filter.

480.0 parts by weight of transparent black composition (II-G),
100.0 parts by weight of dipentaerythritol pentaacrylate,
2- (4-Methoxy-β-styryl) -bis (4,6-trichloromethyl) -s-triazine 5.0 parts by weight.

<Manufacture of transparent black composition (B)>
A transparent black composition (B) was obtained in the same manner as the transparent black composition (G) except that the color pigment B-1 was used as the color pigment.

<Manufacture of transparent black composition (R)>
A transparent black composition (R) was obtained in the same manner as the transparent black composition (G) except that the color pigment R-1 was used as the color pigment.

  According to the said Examples 1-6, the black coloring material for black matrices, the black composition for black matrices, and the color filter were produced. Various characteristics of each production condition and the obtained coloring material, black composition and color filter are shown.

Carbon black 1-5:
Carbon black having the characteristics shown in Table 1 was prepared as the core particle powder.

Organic pigment:
An organic pigment having various characteristics shown in Table 2 was prepared as the organic pigment.

Pigment derivatives 1-3:
Pigment derivatives having various properties shown in Table 3 were prepared as pigment derivatives.

Examples 1-2 to 1-7, Comparative Example 1:
Types and amounts of additives in the coating process with the surface treatment agent, line load and time of edge runner treatment, types and addition amounts of organic pigments and pigment derivatives in the adhesion or coating process of pigment derivatives and / or organic pigments, edge runners A black coloring material for a black matrix was obtained in the same manner as in Example 1-1 except that the line load and time for the treatment were variously changed.

  The production conditions at this time are shown in Table 4, and the characteristics of the black coloring material obtained for the black matrix are shown in Table 5.

Comparative Example 2 (Japanese Unexamined Patent Application Publication No. 2004-224948 Example 1 Additional Test)
Example 1 70.0 g of Printex 25 (manufactured by Degussa: BET specific surface area 46 m ² / g) and 3.5 g of a sulfonated phthalocyanine derivative were charged in a 1 L dry-type attritor and dispersed with SUS304 beads as a medium for 30 minutes. To obtain a dry-treated carbon black.

  Various characteristics of the obtained black particle powder are shown in Table 5.

<Black Matrix>
Examples 4-2 to 4-7, Comparative Examples 3 to 9:
A black composition for black matrix was obtained in the same manner as the black composition (III) for black matrix of Example 4-1 except that the type of black coloring material for black matrix was variously changed.

  Table 6 shows the production conditions, the black composition for black matrix obtained, and various characteristics of the black matrix.

<Color filter>

Color pigment:
Color pigments having various properties shown in Table 7 were prepared as the color pigments.

  The color pigments B-2, G-2, and R-2 are obtained by a method described in JP 2002-356625 A, in which an organic pigment is attached to the particle surface of white inorganic particle powder via a paste. be able to.

Examples 6-2 to 6-10, Comparative Examples 10 to 16:
A color filter was obtained in the same manner as in the color filter of Example 6-1 except that the type of black matrix and the type of color pigment were variously changed.

  Table 8 shows the manufacturing conditions and various characteristics of the obtained color filter.

Claims (9)

At least a part of the particle surface of the carbon black particle powder is coated with a surface treatment agent, and is composed of a black composite particle powder in which a pigment derivative and / or an organic pigment is present on the particle surface of the surface treatment agent-coated carbon black particle. A black coloring material for black matrix characterized by the above. It is characterized by comprising a black composite particle powder in which at least a part of the particle surface of the carbon black particle powder is coated with a surface treatment agent and a pigment derivative is present on the particle surface of the surface treatment agent-coated carbon black particle. Black coloring material for black matrix. At least a part of the particle surface of the carbon black particle powder is coated with a surface treatment agent, and the surface of the surface treatment agent-coated carbon black particle has an L ^* value of 40 in the phthalocyanine derivative or CIE Lab color space display system. A black coloring material for a black matrix, comprising a black composite particle powder in which an organic pigment having a saturation C ^* value of 30 or less is present. 4. A black composition for black matrix comprising the black coloring material for black matrix according to claim 1 dispersed in a solvent. The black composition for black matrix according to claim 4, comprising a transparent resin having at least one acidic group and / or latent acidic group. The black composition for a black matrix according to claim 5 is provided with photosensitivity characterized by containing a photo radical polymerization initiator and a polyfunctional monomer having two or more ethylenically unsaturated double bonds. Black composition for black matrix. A black composition for black matrix to which photosensitivity is imparted, wherein the black composition for black matrix according to claim 5 contains a photoacid generator. A black matrix comprising the black composition for a black matrix according to any one of claims 5 to 7. A color filter comprising a coating film formed of the black composition for a black matrix according to any one of claims 5 to 7.