JP2009084418A - Pigment dispersion composition and photo-curing composition dispersion for color filter using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pigment dispersion composition capable of improving display characteristics of a color filter used for liquid crystal displays etc., to provide a photo-curing composition dispersion for the color filter prepared from the composition, to provide, in particular, particularly the pigment dispersion composition capable of affording a high contrast of the color filter and achieving good display characteristics in the liquid crystal displays and to further provide the photo-curing composition dispersion for the color filter obtained by the composition. <P>SOLUTION: The pigment dispersion composition comprises organic pigment nano-particles having ≤50 nm number-average particle diameter of primary particles and 1.0-2.0 ratio of the volume-average particle diameter to the number-average particle diameter ([volume-average particle diameter]/[number-average particle diameter]), and a graft polymer having repeating units containing at least an organic dye residue in the backbone chain. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a pigment dispersion composition and a photocurable composition dispersion for a color filter obtained thereby.

  As nanotechnology, for example, research for reducing the size of particles to a range of 10 to 100 nm and applying them to various applications has been vigorously advanced. It is intended to bring out new properties that could not be predicted in the past due to the effects that are manifested for the first time by using nanometer size. On the other hand, in the field of organic pigments, for example, research and development of paints, printing inks, electrophotographic toners, inkjet inks, color filters, and the like are underway. In particular, for color filters and inkjet inks, efforts have been made to improve performance using fine chemical technology, and the results are expected.

  Regarding color filters, thinning is desired. As a result, it is possible to achieve high performance such as high pixel count of image-related devices such as liquid crystal display devices, digital cameras, and CCD sensors. In recent years, organic pigments are used in place of dyes as color materials for color filters in consideration of weather resistance, heat resistance, and the like. The thickness of a color filter using a pigment greatly depends on the particle diameter of the pigment. In other words, the development of good pigment fine particles is the key to improving the performance of image-related equipment. Specifically, pigment fine particles having a nanometer size level and monodispersed and stable are required. Then, a new manufacturing method for manufacturing a color filter using an ink jet technique has been studied. As a result, it is expected that the degree of freedom of design is remarkably improved and the production efficiency is greatly improved.

  Here, regarding the method for refining organic particles, it has been common to use a disperser such as a roll mill, a ball mill, an attritor, etc., but recently, a gas phase method, a liquid phase method, laser ablation. Laws are being studied. Among these, the liquid phase method has attracted attention as a method for producing organic particles having excellent simplicity and productivity. Specifically, a method is disclosed in which a pigment solution and a poor solvent are mixed to precipitate nanoparticles, and a predetermined polymer compound or the like is contained therein (see Patent Documents 1 to 4).

  By the way, it is known to use various dispersants in order to obtain a pigment dispersion or a colored photosensitive composition having excellent fluidity and dispersibility. The dispersant can be broadly classified into a polymer dispersant and a low molecular weight compound dispersant. Examples of the polymer dispersant include polyacrylates, sodium maleate olefin copolymers, and terminal carboxyl group-containing polyesters (Patent Documents). 5) Polyester having an acidic group and / or basic group starting from tetrakis (2-hydroxyalkyl) ethylenediamine (Patent Document 6), a macromonomer (an oligomer having an ethylenically unsaturated group at the terminal), a hydroxyl group Known are a monomer having a carboxyl group, a carboxyl group-containing monomer, and a copolymer composed of four other monomers (Patent Document 7).

  In addition, a polymer dispersant in which an organic dye and a polymer are combined is presented. By strengthening the interaction between the organic dye contained in the polymer dispersant and the pigment particles, the polymer dispersant is adsorbed on the pigment particles. Is promoted to improve the dispersibility of the pigment dispersion or the like (Patent Document 8). However, in these dispersants, organic dyes and polymers are bonded using functional groups that are randomly present in the polymer, so that the dye is randomly introduced into the polymer and the affinity between the polymer part and the dispersion solvent. May decrease, and it may be difficult to secure a sufficient adsorption layer necessary for stabilizing the dispersion. In addition, when the amount of organic dye or heterocyclic ring introduced into the polymer increases, the solubility in the dispersion solvent decreases, and it may be difficult to sufficiently secure the adsorption layer necessary for stabilizing the dispersion. .

For the purpose of solving these problems, there has been proposed a polymer dispersant having improved solubility in a dispersion solvent by introducing an organic dye or a heterocyclic ring at the end of the polymer (Patent Document 9). However, in these dispersants, the organic dye or heterocyclic ring is introduced only at the end of the polymer, so there are few adsorption sites on the pigment particles, and on the contrary, the adsorption is inhibited, and an adsorption layer necessary for dispersion stabilization is formed. It is considered difficult to secure enough. In addition, a copolymer containing a macromonomer (an oligomer having an ethylenically unsaturated group at the terminal) is useful for a colored photosensitive composition as a material such as a color filter or a color proof, and the copolymer containing the macromonomer is useful. It is disclosed that a pigment dispersion having a small pigment particle size and excellent dispersion stability can be obtained by using a coalescence (Patent Document 10). However, in the copolymer containing the macromonomer, if it can be strongly adsorbed to the pigment, an adsorption layer necessary for dispersion stabilization can be secured sufficiently, but since the adsorption power to the pigment is weak and insufficient, Even if the agent is used alone, it may not be used alone, and must be used in combination with other dispersants, or may not exhibit sufficient dispersion stability at high contrast. In particular, when a fine pigment is used, a pigment dispersion excellent in dispersibility and fluidity of the pigment and a colored photosensitive composition have not been provided yet.
International Publication No. WO2006 / 121016 Pamphlet JP 2004-43776 A JP 2007-23169 A JP 2007-119586 A Japanese Patent Publication No.54-34009 JP-A-2-245231 JP-A-8-259876 JP 63-175080 A JP-A-9-77987 JP-A-7-140654

  An object of this invention is to provide the pigment dispersion composition which can improve the display characteristic of the color filter used for a liquid crystal display device etc., and the photocurable composition dispersion for color filters obtained by it. In particular, it is an object of the present invention to provide a pigment dispersion composition that can increase the contrast of a color filter and achieve good display characteristics in a liquid crystal display device, and a photocurable composition dispersion for a color filter obtained thereby.

The above problems have been achieved by the following means.
(1) The number average particle diameter of the primary particles is 50 nm or less, and the ratio of the number average particle diameter to the volume average particle diameter ([volume average particle diameter] / [number average particle diameter]) is 1.0 to 2. A pigment dispersion composition comprising: 0 organic pigment nanoparticles; and a graft polymer having a repeating unit containing at least an organic dye residue in the main chain.
(2) The graft polymer is a copolymer composed at least of a polymerizable monomer component having an organic dye residue and a polymerizable oligomer component having an ethylenically unsaturated double bond at the terminal. The pigment dispersion composition according to claim 1.
(3) The pigment dispersion composition according to claim 1 or 2, wherein the main chain or side chain of the graft polymer is a polymer further containing a monomer having an acid group as a repeating unit.
(4) A photocurable composition for a color filter comprising the pigment dispersion composition according to any one of (1) to (3), a photopolymerizable compound, and a photopolymerization initiator.

  The pigment dispersion composition of the present invention and the photocurable composition dispersion for color filters obtained thereby improve the display characteristics of color filters used in liquid crystal display devices and the like. In particular, the color filter has a high contrast and an excellent effect of realizing good display characteristics in the liquid crystal display device is achieved.

Hereinafter, the present invention will be described in detail.
The organic pigment used in the pigment dispersion composition of the present invention is not limited in hue. For example, a perylene compound pigment, a perinone compound pigment, a quinacridone compound pigment, a quinacridone quinone compound pigment, an anthraquinone compound pigment, and an anthrone compound Pigment, benzimidazolone compound pigment, disazo condensation compound pigment, disazo compound pigment, azo compound pigment, indanthrone compound pigment, phthalocyanine compound pigment, triarylcarbonium compound pigment, dioxazine compound pigment, aminoanthraquinone compound pigment, diketopyrrolopyrrole Compound pigments, thioindigo compound pigments, isoindoline compound pigments, isoindolinone compound pigments, pyranthrone compound pigments, isoviolanthrone compound pigments, and mixtures thereof.

  Among these, a quinacridone compound pigment, a diketopyrrolopyrrole compound pigment, a dioxazine compound pigment, a phthalocyanine compound pigment, or an azo compound pigment is preferable, and a diketopyrrolopyrrole compound pigment or a dioxazine compound pigment is more preferable.

More specifically, for example, C.I. I. Pigment red 190 (C.I. No. 71140), C.I. I. Pigment red 224 (C.I. No. 71127), C.I. I. Perylene pigments such as CI Pigment Violet 29 (C.I. No. 71129); I. Pigment orange 43 (C.I. No. 71105), or C.I. I. Perinone pigments such as CI Pigment Red 194 (C.I. No. 71100); I. Pigment violet 19 (C.I. No. 73900), C.I. I. Pigment violet 42, C.I. I. Pigment red 122 (C.I. No. 73915), C.I. I. Pigment red 192, C.I. I. Pigment red 202 (C.I. No. 73907), C.I. I. Pigment Red 207 (C.I. No. 73900, 73906) or C.I. I. Pigment Red 209 (C.I. No. 73905), a quinacridone pigment, C.I. I. Pigment red 206 (C.I. No. 73900/73920), C.I. I. Pigment orange 48 (C.I. No. 73900/73920), or C.I. I. Quinacridone quinone pigments such as CI Pigment Orange 49 (C.I. No. 73900/73920); I. Anthraquinone pigments such as CI Pigment Yellow 147 (C.I. No. 60645); I. Anthanthrone pigments such as CI Pigment Red 168 (C.I. No. 59300); I. Pigment brown 25 (C.I. No. 12510), C.I. I. Pigment violet 32 (C.I. No. 12517), C.I. I. Pigment yellow 180 (C.I. No. 21290), C.I. I. Pigment yellow 181 (C.I. No. 11777), C.I. I. Pigment orange 62 (C.I. No. 11775), or C.I. I. Benzimidazolone pigments such as CI Pigment Red 185 (C.I. No. 12516); I. Pigment yellow 93 (C.I. No. 20710), C.I. I. Pigment yellow 94 (C.I. No. 20038), C.I. I. Pigment yellow 95 (C.I. No. 20034), C.I. I. Pigment yellow 128 (C.I. No. 20037), C.I. I. Pigment yellow 166 (C.I. No. 20035), C.I. I. Pigment orange 34 (C.I. No. 21115), C.I. I. Pigment orange 13 (C.I. No. 21110), C.I. I. Pigment orange 31 (C.I. No. 20050), C.I. I. Pigment red 144 (C.I. No. 20735), C.I. I. Pigment red 166 (C.I. No. 20730), C.I. I. Pigment red 220 (C.I. No. 20055), C.I. I. Pigment red 221 (C.I. No. 20065), C.I. I. Pigment red 242 (C.I. No. 20067), C.I. I. Pigment red 248, C.I. I. Pigment red 262, or C.I. I. Disazo condensation pigments such as CI Pigment Brown 23 (C.I. No. 20060); I. Pigment yellow 13 (C.I. No. 21100), C.I. I. Pigment yellow 83 (C.I. No. 21108), or C.I. I. Disazo pigments such as CI Pigment Yellow 188 (C.I. No. 21094); I. Pigment red 187 (C.I. No. 12486), C.I. I. Pigment red 170 (C.I. No. 12475), C.I. I. Pigment yellow 74 (C.I. No. 11714), C.I. I. Pigment yellow 150 (C.I. No. 48545), C.I. I. Pigment red 48 (C.I. No. 15865), C.I. I. Pigment red 53 (C.I. No. 15585), C.I. I. Pigment orange 64 (C.I. No. 12760), or C.I. I. Azo pigments such as C.I. Pigment Red 247 (C.I. No. 15915), C.I. I. Indanthrone pigments such as CI Pigment Blue 60 (C.I. No. 69800); I. Pigment green 7 (C.I. No. 74260), C.I. I. Pigment Green 36 (C.I. No. 74265), Pigment Green 37 (C.I. No. 74255), Pigment Blue 16 (C.I. No. 74100), C.I. I. Phthalocyanine pigments such as CI Pigment Blue 75 (C.I. No. 74160: 2) or 15 (C.I. No. 74160); I. Pigment blue 56 (C.I. No. 42800), or C.I. I. Triarylcarbonium pigments such as CI Pigment Blue 61 (C.I. No. 42765: 1); I. Pigment violet 23 (C.I. No. 51319) or C.I. I. Dioxazine pigments such as CI Pigment Violet 37 (C.I. No. 51345); I. Aminoanthraquinone pigments such as CI Pigment Red 177 (C.I. No. 65300); I. Pigment red 254 (C.I. No. 56110), C.I. I. Pigment Red 255 (C.I. No. 561050), C.I. I. Pigment red 264, C.I. I. Pigment red 272 (C.I. No. 561150), C.I. I. Pigment orange 71, or C.I. I. Diketopyrrolopyrrole pigments such as C.I. Pigment Orange 73; I. Thioindigo pigments such as CI Pigment Red 88 (C.I. No. 7313); I. Pigment yellow 139 (C.I. No. 56298), C.I. I. Pigment Orange 66 (C.I. No. 48210) and the like, isoindoline pigments such as C.I. I. Pigment yellow 109 (C.I. No. 56284), or C.I. I. Pigment Orange 61 (C.I. No. 11295) and other isoindolinone pigments, C.I. I. Pigment Orange 40 (C.I. No. 59700), or C.I. I. Pyranthrone pigments such as CI Pigment Red 216 (C.I. No. 59710), or C.I. I. And isoviolanthrone pigments such as CI Pigment Violet 31 (60010).
In the pigment dispersion composition of the present invention, two or more kinds of organic pigments or solid solutions of organic pigments can be used in combination.

The organic pigment nanoparticles contained in the dispersion composition of the present invention have a number average particle size of primary particles of 50 nm or less and a ratio of the number average particle size to the volume average particle size ([volume average particle size] / [Number average particle size]) is in the range of 1.0 to 2.0. In the present invention, the values of the volume average particle size and the number average particle size are defined as values obtained by measuring the particle size of 250 particles with a scanning electron microscope. Specifically, the number average particle diameter is obtained by dividing the sum of the diameters of individual particles by the total number of particles in a set of particles, and is represented by the following formula (I).
Formula (I)
Number average particle size dn = Σfidi / Σfi
fi: Number of particles having a particle size di (fraction)
On the other hand, the volume average particle diameter is an average particle diameter weighted by the particle volume, and in a set of particles, the sum of the diameter of each particle multiplied by the volume of the particle is divided by the total volume of the particle. It is represented by the following formula (II).
Formula (II)
Volume average particle diameter dv = Σfidi ⁴ / Σfidi ³
fi: Number of particles having a particle size di (fraction)

  As the relationship between the volume average particle size and the number average particle size, the volume average particle size dv is equal to or larger than the number average particle size dn (volume average particle size ≧ number average particle size). is there. Therefore, in a set of particles having the same particle size, both values are equal, and the ratio of the volume average particle size dv to the number average particle size dn (volume average particle size dv / number average particle size dn) is 1. It becomes. Further, the larger the ratio between the volume average particle diameter dv and the number average particle diameter dn, the wider the particle size distribution. The volume average particle number and the number average particle size are described in Soichi Muroi, “Polymer Latex Chemistry”, Polymer Publishing Association, page 119.

  Such organic pigment nanoparticles are not limited, but are compatible with an organic pigment solution in which an organic pigment is dissolved in a good solvent (first solvent) and the good solvent. It is preferable to use nanoparticles of organic pigment deposited by mixing with a solvent that becomes a poor solvent (second solvent). Details of this method can be referred to the descriptions in Japanese Patent Application Laid-Open No. 2007-23169 and Japanese Patent Application No. 2006-129714. Hereinafter, specific embodiments of the fine particle precipitation will be described.

  The good solvent (first solvent) is not particularly limited as long as it can dissolve the organic pigment and is compatible with or uniformly mixed with the poor solvent (second solvent). The solubility of the organic pigment in the first solvent is preferably 0.2% by mass or more, and more preferably 0.5% by mass or more. Although there is no particular upper limit to the solubility, it is practical that the solubility is 50% by mass or less in consideration of a commonly used organic pigment.

  As for the compatibility of the first solvent and the second solvent, the amount of the first solvent dissolved in the second solvent is preferably 30% by mass or more, and more preferably 50% by mass or more. There is no particular upper limit on the amount of the first solvent dissolved in the second solvent, but it is practical to mix them in an arbitrary ratio.

  Although it does not specifically limit as a 1st solvent, An organic acid (For example, formic acid, dichloroacetic acid, methanesulfonic acid etc.), an organic base (For example, diazabicycloundecene (DBU), tetrabutylammonium hydroxide, sodium methoxide) Etc.), aqueous solvents (for example, water, hydrochloric acid, sodium hydroxide aqueous solution), alcohol solvents (for example, methanol, ethanol, n-propanol, etc.), ketone solvents (for example, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, etc.) , Ether solvents (eg, tetrahydrofuran, propylene glycol monomethyl ether, propylene glycol monomethyl ether acetate, etc.), sulfoxide solvents (eg, dimethyl sulfoxide, hexamethylene sulfoxide, sulfolane, etc.) Ester solvents (for example, ethyl acetate, n-butyl acetate, ethyl lactate, etc.), amide solvents (for example, N, N-dimethylformamide, 1-methyl-2-pyrrolidone, etc.), aromatic hydrocarbon solvents ( For example, toluene, xylene, etc.), aliphatic hydrocarbon solvents (for example, octane), nitrile solvents (for example, acetonitrile), halogen solvents (for example, carbon tetrachloride, dichloromethane, etc.), ionic liquids (for example, And 1-ethyl-3-methylimidazolium tetrafluoroborate), a carbon disulfide solvent, or a mixture thereof.

  The second solvent is not particularly limited, but the solubility of the organic pigment in the second solvent is preferably 0.02% by mass or less, and more preferably 0.01% by mass or less. Although there is no particular lower limit to the solubility of the organic pigment in the second solvent, 0.0001% by mass or more is practical in consideration of a commonly used organic pigment. Although there is no particular lower limit to the solubility of the organic pigment in the second solvent, 0.001% by mass or more is practical in consideration of a commonly used polymer compound.

  Although it does not specifically limit as a 2nd solvent, An aqueous solvent (for example, water, hydrochloric acid, sodium hydroxide aqueous solution), an alcoholic solvent (for example, methanol, ethanol, n-propanol, etc.), a ketone solvent (for example, methyl ethyl ketone) , Methyl isobutyl ketone, cyclohexanone, etc.), ether solvents (eg, tetrahydrofuran, propylene glycol monomethyl ether, propylene glycol monomethyl ether acetate, etc.), sulfoxide solvents (eg, dimethyl sulfoxide, hexamethylene sulfoxide, sulfolane, etc.), ester solvents (Eg, ethyl acetate, acetic acid-n-butyl, ethyl lactate, etc.), amide solvents (eg, N, N-dimethylformamide, 1-methyl-2-pyrrolidone, etc.), aromatic hydrocarbon solvents ( For example, toluene, xylene, etc.), aliphatic hydrocarbon solvents (eg, octane, etc.), nitrile solvents (eg, acetonitrile, etc.), halogen solvents (eg, carbon tetrachloride, dichloromethane, etc.), ionic liquids (eg, And 1-ethyl-3-methylimidazolium tetrafluoroborate), a carbon disulfide solvent, or a mixture thereof.

  Although there are some common ones listed as specific examples of the first solvent and those listed as the second solvent, the same ones as the first solvent and the second solvent are not combined. For each organic pigment employed, the solubility in the first solvent is preferably sufficiently higher than the solubility in the second solvent. For the pigment, for example, the solubility difference is preferably 0.2% by mass or more, and more preferably 0.5% by mass or more. There is no particular upper limit to the difference in solubility between the first solvent and the second solvent, but it is practical that the difference is 50% by mass or less in consideration of a commonly used organic pigment.

  The state of the second solvent is not particularly limited, and a range from normal pressure to subcritical and supercritical conditions can be selected. The temperature at normal pressure is preferably −30 to 100 ° C., more preferably −10 to 60 ° C., and particularly preferably 0 to 30 ° C. The viscosity of the organic pigment solution is preferably 0.5 to 100.0 mPa · s, and more preferably 1.0 to 50.0 mPa · s.

  When mixing the organic pigment solution and the second solvent, either of them may be added and mixed. However, the organic pigment solution is preferably jetted into the second solvent and mixed, and in this case, the second solvent is mixed. Is preferably in a stirred state. The stirring speed is preferably 100 to 10,000 rpm, more preferably 150 to 8000 rpm, and particularly preferably 200 to 6000 rpm. A pump or the like may be used for the addition, or it may not be used. Moreover, although addition in a liquid or addition outside a liquid may be sufficient, addition in a liquid is more preferable. Further, it is preferable to continuously supply the liquid into the liquid through a supply pipe. The inner diameter of the supply pipe is preferably 0.1 to 200 mm, more preferably 0.2 to 100 mm. As a speed | rate supplied into a liquid from a supply pipe | tube, 1-1000 ml / min is preferable and 5-5000 ml / min is more preferable.

The mixing ratio of the organic pigment solution and the second solvent is preferably 1/50 to 2/3, more preferably 1/40 to 1/2, and particularly preferably 1/20 to 3/8.
The particle concentration in the liquid when the organic pigment fine particles are deposited is not particularly limited, but the organic pigment fine particles are preferably in the range of 10 to 40,000 mg, more preferably in the range of 20 to 30000 mg with respect to 1000 ml of the solvent. Especially preferably, it is the range of 50-25000 mg.

  In the pigment dispersion composition of the present invention, the pigment content is not particularly limited, but is preferably 2 to 30% by mass, and more preferably 4 to 20% by mass.

  The dispersion composition of the present invention contains a graft polymer having a repeating unit containing at least an organic dye residue in the main chain. The graft polymer only needs to have a repeating unit containing at least an organic dye residue in the main chain (main chain), and the main chain may contain other monomers as copolymerized units.

The mass average molecular weight (Mw) of the graft polymer is preferably 3000 to 100,000, and more preferably 5000 to 50000. When the mass average molecular weight (Mw) is less than 3000, it is difficult to prevent aggregation of the pigment, and the viscosity may increase. Moreover, when the said mass mean molecular weight (Mw) exceeds 100,000, the solubility to an organic solvent may be insufficient and a viscosity may rise. In addition, the said mass mean molecular weight (Mw) is a polystyrene conversion mass mean molecular weight measured by gel permeation chromatography (carrier: tetrahydrofuran).
The side chain of the graft polymer is not particularly limited, but the number of carbon atoms in one side chain is preferably 40 to 600, and more preferably 50 to 500. The number of side chains in the graft polymer is not particularly limited, but is preferably 1 to 10.

  Preferred examples of the graft polymer include polystyrene, polyethylene oxide, polypropylene oxide, poly (meth) acrylic acid ester, polycaprolactone, and the like, but the structural unit represented by the following general formula (1) is represented by a side chain ( A graft polymer having at least a branch) is more preferable.

一般式（１）中、Ｒ^１は、水素原子または炭素原子数１〜８のアルキル基を表し、Ｑはシアノ基、炭素原子数６〜３０のアリール基、または−ＣＯＯＲ^２（ここで、Ｒ^２は水素原子、炭素原子数１〜２２のアルキル基、炭素原子数６〜３０のアリール基を表す。）を表す。

In General Formula (1), R ¹ represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms, Q is a cyano group, an aryl group having 6 to 30 carbon atoms, or —COOR ² (where R 1 ² represents a hydrogen atom, an alkyl group having 1 to 22 carbon atoms, or an aryl group having 6 to 30 carbon atoms.

In the general formula (1), when the group represented by R ¹ is an alkyl group, an alkyl group having 1 to 6 carbon atoms is preferable, and a methyl group is particularly preferable. This alkyl group may have a substituent, and examples of the substituent of the alkyl group include a halogen atom, a carboxyl group, an alkoxycarbonyl group, and an alkoxy group. Specific examples of such an alkyl group include a methyl group, an ethyl group, a hexyl group, an octyl group, a trifluoromethyl group, a carboxymethyl group, and a methoxycarbonylmethyl group. Of such R ¹ , a hydrogen atom and a methyl group are preferable.

  In the general formula (1), when the group represented by Q is an aryl group, an aryl group having 6 to 20 carbon atoms is preferable, and an aryl group having 6 to 12 carbon atoms is particularly preferable. This aryl group may have a substituent, and examples of the substituent of the aryl group include a halogen atom, an alkyl group, an alkoxy group, and an alkoxycarbonyl group. Specific examples of such aryl groups include phenyl, naphthyl, tolyl, xylyl, propylphenyl, butylphenyl, octylphenyl, dodecylphenyl, methoxyphenyl, ethoxyphenyl, butoxy. Examples thereof include a phenyl group, a decyloxyphenyl group, a chlorophenyl group, a dichlorophenyl group, a bromophenyl group, a methoxycarbonylphenyl group, an ethoxycarbonylphenyl group, and a butoxycarbonylphenyl group. Among such aryl groups, an aryl group substituted with an unsubstituted aryl group, a halogen atom, an alkyl group, or an alkoxy group is preferable, and an aryl group substituted with an unsubstituted aryl group or an alkyl group is particularly preferable.

When the group represented by Q in the general formula (1) is —COOR ² and the group represented by R ² is an alkyl group, the alkyl group may have a substituent. When R ² is an alkyl group, an alkyl group having 1 to 12 carbon atoms is preferable, and an alkyl group having 1 to 8 carbon atoms is particularly preferable. Examples of the substituent for the alkyl group include a halogen atom, an alkenyl group, an aryl group, a hydroxyl group, an alkoxy group, an alkoxycarbonyl group, an amino group, an acylamino group, and a carbamoyl group. Specific examples of such alkyl groups include methyl, ethyl, propyl, butyl, heptyl, hexyl, octyl, decyl, dodecyl, tridecyl, tetradecyl, hexadecyl, octadecyl. Group, 2-chloroethyl group, 2-bromoethyl group, 2-methoxycarbonylethyl group, 2-methoxyethyl group, 2-bromopropyl group, 2-butenyl group, 2-pentenyl group, 3-methyl-2-pentenyl group, 2-hexenyl group, 4-methyl-2-hexenyl group, benzyl group, phenethyl group, 3-phenylpropyl group, naphthylmethyl group, 2-naphthylethyl group, chlorobenzyl group, bromobenzyl group, methylbenzyl group, ethylbenzyl Group, methoxybenzyl group, dimethylbenzyl group, dimethoxybenzyl group, cyclohexyl Group, 2-cyclohexylethyl group, 2-cyclopentylethyl group, bicyclo [3.2.1] oct-2-yl group, 1-adamantyl group, dimethylaminopropyl group, acetylaminoethyl group, N, N-dibutyl An aminocarbamoylmethyl group etc. are mentioned. Among such alkyl groups, an unsubstituted alkyl group, a halogen atom, an aryl group, or an alkyl group substituted with a hydroxyl group is preferred, and an unsubstituted alkyl group is particularly preferred.

When the group represented by Q in the general formula (1) is —COOR ² and the group represented by R ² is an aryl group, the aryl group may have a substituent. When R ² is an aryl group, an aryl group having 6 to 20 carbon atoms is preferable, and an aryl group having 6 to 12 carbon atoms is particularly preferable. Examples of the substituent for the aryl group include a halogen atom, an alkyl group, an alkenyl group, an alkoxy group, an alkoxycarbonyl group, and an acylamino group. Specific examples of such aryl groups include phenyl, naphthyl, tolyl, xylyl, propylphenyl, butylphenyl, octylphenyl, dodecylphenyl, methoxyphenyl, ethoxyphenyl, butoxy. Phenyl group, decyloxyphenyl group, chlorophenyl group, dichlorophenyl group, bromophenyl group, methoxycarbonylphenyl group, ethoxycarbonylphenyl group, butoxycarbonylphenyl group, acetamidophenyl group, propioamidophenyl group, dodeciloylamidophenyl group, Etc. Among such aryl groups, an aryl group substituted with an unsubstituted aryl group, a halogen atom, an alkyl group, or an alkoxy group is preferable, and an aryl group substituted with an alkyl group is particularly preferable.

Among such R ² , a hydrogen atom and an alkyl group having 1 to 22 carbon atoms are preferable, and a hydrogen atom and an alkyl group having 1 to 12 carbon atoms are particularly preferable.

  Specific examples of the branch of the graft polymer having at least the structural unit represented by the general formula (1) in the branch include polymethyl (meth) acrylate, poly-n-butyl (meth) acrylate, poly- i-butyl (meth) acrylate, poly (methyl (meth) acrylate-co-benzyl (meth) acrylate), poly (methyl (meth) acrylate-co-styrene), poly (methyl (meth) acrylate-co- (meta) ) Acrylic acid), poly (methyl (meth) acrylate-co-acrylonitrile) and the like.

  Any method may be used for the synthesis of the graft polymer having at least the structural unit represented by the general formula (1) in the branch. For example, a polymer reaction between a linear polymer having no graft chain and a graft chain component, or graft copolymerization of “a monomer containing an organic dye residue constituting a main chain” and “a polymerizable oligomer constituting a side chain”. Although it can synthesize | combine by superposition | polymerization etc., the latter is preferable from a viewpoint of control of the graft chain at the time of synthesis | combination. Specific examples include copolymerization with a macromonomer having at least the structural unit represented by the general formula (1) and an ethylenically unsaturated monomer copolymerizable.

  The trunk chain or the side chain may contain an acidic monomer and other monomers as copolymerized units as necessary.

  As content of the said copolymerization unit in the said graft copolymer, "the said polymerizable oligomer" is 50-99 mass%, Preferably it is 60-98 mass%, "The monomer which has the said organic pigment residue" "Is 50 to 1% by mass, preferably 40 to 2% by mass.

  If the content of the polymerizable oligomer is less than 50% by mass, a steric repulsion effect as a pigment dispersant cannot be obtained, and it becomes difficult to prevent aggregation of the pigment, and the solubility in the dispersion solvent is reduced. , It becomes difficult to secure a sufficient adsorption layer necessary for stabilizing the dispersion, and when it exceeds 99% by mass, the proportion of the monomer having the organic dye residue and / or the heterocyclic ring decreases, and the adsorption ability to the pigment. May decrease and the dispersibility may not be fully exhibited. If the content of the monomer having the organic dye residue is less than 1% by mass, the adsorption ability to the pigment may be reduced and the dispersibility may not be sufficiently exhibited. Therefore, the steric repulsion effect as a pigment dispersant may not be obtained, and the aggregation of the pigment may not be sufficiently prevented. Also, the solubility in the dispersion solvent is reduced, and the dispersion is stabilized. It may be difficult to ensure a sufficient adsorption layer. Moreover, when using the other monomer copolymerizable with these, as the content of this other monomer, the inside of the range of 1-49 mass% is preferable.

The polymerizable oligomer (hereinafter sometimes referred to as “macromonomer”) is an oligomer having a group having an ethylenically unsaturated double bond at the terminal. In the present invention, among the polymerizable oligomers, it is preferable to have a group having the ethylenically unsaturated double bond only at one of both ends of the oligomer.
Of the macromonomers having at least the structural unit represented by the general formula (1), preferred are those represented by the following general formula (2).

一般式（２）中、Ｒ^３は、水素原子または炭素原子数１〜８のアルキル基を表し、水素原子、メチル基が特に好ましい。Ｗは単結合または、

In General Formula (2), R ³ represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms, and a hydrogen atom and a methyl group are particularly preferable. W is a single bond or

（Ｚ_１、Ｚ_２は水素原子、ハロゲン原子、炭素原子数１〜６のアルキル基、シアノ基、ヒドロキシル基を表し、Ｚ_３は水素原子、炭素原子数１〜１８のアルキル基、炭素原子数６〜２０のアリール基を表す。）等の原子団から選ばれた単独の連結基もしくは任意の組合せで構成された連結基を表し、特に−ＣＯＯ−、フェニレンが好ましい。Ａは、前記した一般式（１）で表される構成単位を少なくとも有する基を表す。
このような一般式（２）で表されるマクロモノマーの具体的な例としては、

(Z ₁ and Z ₂ represent a hydrogen atom, a halogen atom, an alkyl group having 1 to 6 carbon atoms, a cyano group, and a hydroxyl group, and Z ₃ represents a hydrogen atom, an alkyl group having 1 to 18 carbon atoms, and the number of carbon atoms. Represents an aryl group of 6 to 20), and represents a single linking group selected from an atomic group such as), or a linking group composed of any combination, and —COO— and phenylene are particularly preferable. A represents a group having at least the structural unit represented by the general formula (1).
As a specific example of the macromonomer represented by the general formula (2),

が挙げられる（Ａは、前記一般式（２）におけるＡと同義である）。

(A is synonymous with A in the general formula (2)).

  The molecular weight of the polymerizable oligomer is preferably a polystyrene-equivalent number average molecular weight (Mn) of 1000 to 20000, more preferably 2000 to 15000. If the number average molecular weight is less than 1000, the steric repulsion effect as a pigment dispersant may not be sufficient, and if it exceeds 20000, it may take time to adsorb to the pigment due to the steric effect.

Specific examples of the polymerizable oligomer include poly-2hydroxyethyl (meth) acrylate, polystyrene polymer, polymethyl (meth) acrylate, poly-n-butyl (meth) acrylate, poly-i-butyl (meth) acrylate, and the like. And a polymer having a (meth) acryloyl group bonded to one molecular end.
The polymerizable oligomer may be a commercially available product or may be appropriately synthesized. Examples of the commercially available product include a one-end methacryloylated polystyrene oligomer (Mn = 6000, trade name: AS-6). , Manufactured by Toa Gosei Chemical Co., Ltd.), one-end methacryloylated polymethyl methacrylate oligomer (Mn = 6000, trade name: AA-6, manufactured by Toa Gosei Chemical Co., Ltd.), one-end methacryloylated poly-n-butyl Acrylate oligomer (Mn = 6000, trade name: AB-6, manufactured by Toa Gosei Chemical Co., Ltd.), single-end methacryloylated polymethyl methacrylate / 2-hydroxyethyl methacrylate oligomer (Mn = 7000, trade name: AA-714) Toa Gosei Chemical Co., Ltd.), one-end methacryloylated polybutyl methacrylate / -Hydroxyethyl methacrylate oligomer (Mn = 7000, trade name: 707S, manufactured by Toa Gosei Chemical Co., Ltd.), single-end methacryloylated poly 2-ethylhexyl methacrylate / 2-hydroxyethyl methacrylate oligomer (Mn = 7000, trade name: AY) -707S, AY-714S, manufactured by Toa Gosei Chemical Co., Ltd.), and the like.

  A preferred specific example of the polymerizable oligomer in the present invention is at least one oligomer selected from a polymer of alkyl (meth) acrylate and a copolymer of alkyl (meth) acrylate and polystyrene, A number average molecular weight is 1000-20000, and what has a (meth) acryloyl group at the terminal is mentioned.

  In the present invention, the “organic dye residue” refers to the remaining part from which a specific structural site of the organic dye mother nucleus is removed, and means a partial skeleton contained in the organic dye mother nucleus. In the present invention, the organic dye residue preferably has a function of adsorbing with the pigment coexisting in the composition, and the organic dye residue itself may or may not be colored. The organic dye residue is preferably (i) a substituent having 1 or 2 or more heteroatoms and 1 or 2 or more aromatic rings, or (ii) a substituent having 2 or more aromatic rings. In particular, (i-i) a substituent having two or more heteroatoms and having one or more aromatic rings, or (i-ii) a substituent having one heteroatom and having two or more aromatic rings It is preferable that The type of the organic dye compound is not particularly limited, but in the present invention, a phthalocyanine compound, an insoluble azo compound, an azo lake compound, an anthraquinone compound, a quinacridone compound, a dioxazine compound, a diketopyrrolopyrrole compound, an anthracidine compound, an anthrone compound, Indanthrone compounds, flavanthrone compounds, perinone compounds, perylene compounds, thioindigo compounds, pyranthrone compounds, isoindolinone compounds, isoindoline compounds, quinophthalone compounds, such as thiophene, furan, xanthene, pyrrole, pyrroline, pyrrolidine, Dioxolane, pyrazole, pyrazoline, pyrazolidine, imidazole, oxazole, thiazole, oxadiazole, triazole, thiadiazole, pyra , Pyridine, piperidine, dioxane, morpholine, pyridazine, pyrimidine, piperazine, triazine, trithiane, isoindoline, isoindolinone, benzimidazolone, benzothiazole, succinimide, phthalimide, naphthalimide, hydantoin, indole, quinoline, carbazole, acridine, It preferably has a heterocyclic structure such as acridone or anthraquinone, and benzimidazolone, naphthalimide, carbazole and acridone are particularly preferred.

  Specific examples of the organic dye residue are given below, but the present invention is not limited thereto. These organic dye residues may further have a substituent, and examples of the substituent include a halogen atom, an alkyl group, an aryl group, and an acylamino group.

  As the monomer having an organic dye residue, a compound represented by the following general formula (3) is suitable.

In the general formula (3), R ⁴ represents a hydrogen atom or a methyl group. R ⁵ represents a single bond or a divalent hydrocarbon group having 1 to 10 carbon atoms. The hydrocarbon group may have a substituent and may be bonded via an ether or ester bond in the middle. Specifically, an alkylene such as (CH ₂ ) ₁ (wherein 1 is an integer of 1 to 10), a branched alkylene such as isopropylidene, a cyclic alkylene such as cyclohexylene, an aromatic ring such as phenylene, toluylene, xylylene, and naphthylene. Group having an ether bond such as (C ₂ H ₄ O) _m , (C ₃ H ₆ O) _n (m is an integer of 1 to 5, n is an integer of 1 to 3), (CH ₂ ) p ¹ -OCO- _(CH ^{2) p} 2 ^{_{and, (CH 2) p 1 -COO-}} (CH 2) be through an ester bond such as ^{p 2 (p} 1 + ^{p 2} is an integer from 1 to 9), further carbon-carbon double bond, which through a triple bond, and a combination thereof can be mentioned, _{(CH 2)} alkylene, such as _l (l is an integer of from 1 to 10), branched alkylene such as _{isopropylidene, (C} 2 _{H 4 ) M, (C 3 H 6} O) is via an ether bond, such as _n (m is an integer of from 1 to 5, n represents an integer of 1 to 3) are preferred.

  In the general formula (3), P represents an organic dye residue. The P is not particularly limited as long as it is an organic dye residue selected from the organic dye group, and specific examples thereof include the same as the specific examples of the organic dye residue described above. Among these, benzimidazolone, naphthalimide, carbazole, and acridone are preferable.

In the general formula (3), X ¹ represents —O—, —CO—, —COO—, —OCO—, —CONH—, —NHCO—, phenylene, and —COO—, —CONH—, and phenylene represent preferable.

In the general formula (3), X ² represents —O—, —N (R ⁶ ) —, —N (R ⁷ ) CON (R ⁸ ) —, —N (R ⁹ ) COO—, —OCON (R ¹⁰ )-. In X ² , R ^{6 to} R ¹⁰ each independently represent a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, or a phenyl group.

Specific examples of the monomer having the organic dye residue (Exemplary Compounds 1-1 to 1-13) are shown below, but the present invention is not limited thereto, and for example, R in the general formula (3) ⁴ , combinations of R ⁵ , X ¹ , X ² and P are also included as appropriate.

  The trunk portion of the graft polymer may have other repeating units in addition to the repeating unit containing the organic dye residue. The other repeating units are (meth) acrylic acid, (meth) acrylic acid esters, vinyl esters, (meth) acrylamides upon copolymerization of the polymerizable macromonomer and the monomer having an organic dye residue. , Styrenes, vinyl ethers, vinyl ketones, maleimides, (meth) acrylonitrile, and the like can be contained by coexistence and polymerization. These monomers may be used independently and may use 2 or more types together.

  Examples of (meth) acrylic acid esters include methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) acrylate, and n-butyl (meth) acrylate. , Isobutyl (meth) acrylate, t-butyl (meth) acrylate, amyl (meth) acrylate, n-hexyl (meth) acrylate, cyclohexyl (meth) acrylate, t-butylcyclohexyl (meth) acrylate, (Meth) acrylic acid 2-ethylhexyl, (meth) acrylic acid t-octyl, (meth) acrylic acid dodecyl, (meth) acrylic acid octadecyl, (meth) acrylic acid acetoxyethyl, (meth) acrylic acid 4-hydroxybutyl, 2-methoxyethyl (meth) acrylate, 2-ethoxyethyl (meth) acrylate, 2- (2-methoxyethoxy) ethyl (meth) acrylate, 2-chloroethyl (meth) acrylate, diethylene glycol monomethyl ether (meth) acrylate, diethylene glycol monoethyl ether (meth) acrylate, triethylene glycol (meth) acrylate Monomethyl ether, (meth) acrylic acid triethylene glycol monoethyl ether, (meth) acrylic acid polyethylene glycol monomethyl ether, (meth) acrylic acid polyethylene glycol monoethyl ether, (meth) acrylic acid nonylphenoxy polyethylene glycol, (meth) acrylic Examples include dicyclopentenyl acid, dicyclopentenyloxyethyl (meth) acrylate, and dicyclopentanyl (meth) acrylate.

Examples of vinyl esters include vinyl acetate, vinyl chloroacetate, vinyl propionate, vinyl butyrate, vinyl methoxyacetate and the like.
(Meth) acrylamides include (meth) acrylamide, N-methyl (meth) acrylamide, N-ethyl (meth) acrylamide, N-propyl (meth) acrylamide, N-isopropyl (meth) acrylamide, and Nn-butyl. Acrylic (meth) amide, Nt-butyl (meth) acrylamide, N-cyclohexyl (meth) acrylamide, N- (2-methoxyethyl) (meth) acrylamide, N, N-dimethyl (meth) acrylamide, N, N -Diethyl (meth) acrylamide, (meth) acryloylmorpholine, diacetone acrylamide, N-methylol acrylamide, N-hydroxyethyl acrylamide, vinyl (meth) acrylamide, N, N-diallyl (meth) acrylamide, N-allyl (meth) Ak Ruamido and the like.

  Examples of styrenes include styrene, methyl styrene, dimethyl styrene, trimethyl styrene, ethyl styrene, isopropyl styrene, butyl styrene, hydroxy styrene, methoxy styrene, butoxy styrene, acetoxy styrene, chloro styrene, dichloro styrene, bromo styrene, chloromethyl Examples include styrene, methyl vinylbenzoate, and α-methylstyrene.

  Examples of vinyl ethers include methyl vinyl ether, ethyl vinyl ether, 2-chloroethyl vinyl ether, hydroxyethyl vinyl ether, propyl vinyl ether, butyl vinyl ether, hexyl vinyl ether, octyl vinyl ether, methoxyethyl vinyl ether, and the like.

  Examples of vinyl ketones include methyl vinyl ketone, ethyl vinyl ketone, propyl vinyl ketone, and phenyl vinyl ketone.

  In the pigment dispersion composition of the present invention, the content of the graft polymer compound is not particularly limited, but is preferably 10 to 70% by mass with respect to the total solid content of the pigment dispersion composition. More preferably, it is mass%.

An example of a graft polymer having a repeating unit containing at least an organic dye residue in the backbone is shown in the following general formula G, but the present invention is not limited to this. Here, the graft polymer represented by the general formula G has repeating units G1 to G3, and X ¹ , X ² , R ³ , R ⁴ , R ⁵ , A, and P are represented by the general formulas (2) and ( Same as in 3). R ¹¹ is a hydrogen atom or an alkyl group having 1 to 8 carbon atoms, and R ¹² is a hydrogen atom, an alkyl group having 1 to 22 carbon atoms, or an aryl group having 6 to 30 carbon atoms. a is 50 to 99% by mass, b is 1 to 50% by mass, and c is 0 to 40% by mass.

  In the present invention, other polymers and various dispersing agents can be used together with the graft polymer compound. Although it does not restrict | limit in particular in this invention, A pigment derivative type compound is mentioned as what is used preferably.

  The pigment dispersion composition of the present invention preferably contains at least one solvent. The solvent is not particularly limited, but is preferably an organic solvent, and examples thereof include the solvent described in the section of “photocurable composition” described later.

  In the pigment dispersion composition of the present invention, the number average particle size of the primary particles described above is 50 nm or less, and (volume average particle size) / (number average particle size) is 1.0 to 2.0. It preferably contains organic pigment nanoparticles and a graft polymer having a repeating unit containing at least an organic dye residue in the backbone, and further contains a solvent. In addition to these, it contains other components as necessary. May be.

The pigment dispersion composition of the present invention can be used, for example, for forming a multicolored colored image on a substrate such as a paint, printing ink (printing ink), a color display board using the same, or a color proof, and in particular. It can be suitably used for the production of color filters used in color liquid crystal displays, solid-state imaging devices and the like.
The organic pigment nanoparticles of the present invention are preferably subjected to a predetermined treatment / operation in the dispersion composition to form a soft aggregate of nanoparticles. Here, soft agglomeration is an agglomeration that is weak enough to be redispersed as necessary, and the soft agglomerates are sometimes called flocs. In this way, for example, organic pigment fine particles precipitated in an aqueous dispersion composition can be quickly separated by filtration or the like. Then, the separated soft agglomerates are redispersed in an organic solvent suitable for the production of a color filter together with a graft polymer having a repeating unit containing at least an organic dye residue in the main chain, thereby efficiently dispersing an organic solvent-based dispersion composition It can be. That is, when the mixed solvent of the good solvent and the poor solvent is an aqueous solvent, the dispersion medium (continuous phase) can be switched by efficiently replacing it with a third solvent made of an organic solvent. In the present invention, the dispersion composition is used to mean not only a liquid composition (dispersion) but also a semi-solid or solid composition. The average particle size of the aggregate is not particularly limited, but is preferably 1 to 1000 μm, more preferably 5 to 100 μm in view of the filterability described above.

  The photocurable composition of the present invention comprises at least the pigment dispersion composition of the present invention described above, an alkali-soluble resin, a photopolymerizable compound, and a photopolymerization initiator. May be included. Since this photocurable composition contains at least one of the aforementioned graft-type polymer compounds as a pigment dispersant, the pigment is kept in a good dispersion state in the composition, and good color characteristics can be obtained. When a color filter is configured, high contrast can be obtained. Hereinafter, each component will be described in detail.

  The photocurable composition of the present invention is constituted by using at least one pigment dispersion composition. The details of the pigment dispersion composition of the present invention constituting the photocurable composition are as described above. The content of the pigment dispersion composition in the photocurable composition is preferably such that the pigment content is in the range of 5 to 70% by mass with respect to the total solid content (mass) of the photocurable composition. More preferably, the pigment content is in the range of 15 to 60% by mass. When the content of the pigment dispersion composition is within the above range, the color density is sufficient and effective in securing excellent color characteristics.

  The photocurable composition of the present invention preferably contains at least one alkali-soluble resin. The alkali-soluble resin is a high molecular polymer, and at least one group that promotes alkali solubility in a molecule (preferably a molecule having an acrylic copolymer or a styrene copolymer as a main chain) (for example, It can be suitably selected from alkali-soluble resins having a carboxyl group, a phosphate group, a sulfonate group and the like. Of these, more preferred are those which are soluble in an organic solvent and can be developed with a weak alkaline aqueous solution.

For the production of the alkali-soluble resin, for example, a method by radical polymerization can be applied. Polymerization conditions such as temperature, pressure, type and amount of radical initiator, type of solvent, etc. when producing an alkali-soluble resin by radical polymerization can be easily set by those skilled in the art, and the conditions are determined experimentally. It can also be done.
As said high molecular polymer, the polymer which has carboxylic acid in a side chain is preferable. For example, JP-A-59-44615, JP-B-54-34327, JP-B-58-12777, JP-B-54-25957, JP-A-59-53836, JP-A-59-71048 As described, methacrylic acid copolymer, acrylic acid copolymer, itaconic acid copolymer, crotonic acid copolymer, maleic acid copolymer, partially esterified maleic acid copolymer, etc., and side chain Examples thereof include acidic cellulose derivatives having a carboxylic acid, polymers obtained by adding an acid anhydride to a polymer having a hydroxyl group, and high molecular polymers having a (meth) acryloyl group in the side chain.

Specifically, a copolymer of (meth) acrylic acid and another monomer copolymerizable therewith is preferable as the alkali-soluble resin.
Examples of other monomers copolymerizable with (meth) acrylic acid include (meth) acrylic acid esters, crotonic acid esters, vinyl esters, maleic acid diesters, fumaric acid diesters, and itaconic acid diesters. (Meth) acrylamides, styrenes, vinyl ethers, vinyl ketones, olefins, maleimides, (meth) acrylonitrile and the like.

Of these, benzyl (meth) acrylate / (meth) acrylic acid copolymers and multi-component copolymers consisting of benzyl (meth) acrylate / (meth) acrylic acid / other monomers are particularly suitable.
In addition, those obtained by copolymerizing 2-hydroxyethyl methacrylate are also useful. The polymer can be used by mixing in an arbitrary amount.

In addition to the above, (meth) acrylate 2-hydroxypropyl / polystyrene macromonomer / benzyl methacrylate / methacrylic acid copolymer, 2-hydroxy-3-phenoxypropyl acrylate / Polymethyl methacrylate macromonomer / benzyl methacrylate / methacrylic acid copolymer, 2-hydroxyethyl methacrylate / polystyrene macromonomer / methyl methacrylate / methacrylic acid copolymer, 2-hydroxyethyl methacrylate / polystyrene macromonomer / methacrylic acid Examples include benzyl / methacrylic acid copolymer.
In addition, (meth) acrylic resins having an allyl group, a vinyl ester group and a carboxyl group in the side chain, and a double chain in the side chain described in JP-A Nos. 2000-187322 and 2002-62698 Alkali-soluble resins and alkali-soluble resins having an amide group in the side chain described in JP-A No. 2001-242612 are preferred because of their excellent balance of film strength, sensitivity, and developability.

The mass average molecular weight of the alkali-soluble resin that can be used in the present invention is preferably 5,000 or more, more preferably 10,000 to 300,000, and the number average molecular weight is preferably 1,000 or more. Yes, more preferably in the range of 2,000-250,000. The polydispersity (mass average molecular weight / number average molecular weight) is preferably in the range of 1.1 to 10, more preferably in the range of 1.2 to 5.
These alkali-soluble resins may be random polymers, block polymers, graft polymers or the like.

The alkali-soluble resin that can be used in the present invention can be synthesized by a conventionally known method. Solvents used in the synthesis include, for example, tetrahydrofuran, ethylene dichloride, cyclohexanone, methyl ethyl ketone, acetone, methanol, ethanol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, 2-methoxyethyl acetate, diethylene glycol dimethyl ether, 1-methoxy. Examples include 2-propanol, 1-methoxy-2-propyl acetate, N, N-dimethylformamide, N, N-dimethylacetamide, toluene, ethyl acetate, methyl lactate, ethyl lactate, dimethyl sulfoxide, and water. These solvents are used alone or in combination of two or more.
Examples of the radical polymerization initiator used when synthesizing the alkali-soluble resin that can be used in the present invention include known compounds such as an azo initiator and a peroxide initiator.

  As content in the photocurable composition of alkali-soluble resin, 1-20 mass% is preferable with respect to the total solid of this composition, More preferably, it is 2-15 mass%, Most preferably, it is 3 ˜12% by mass.

  The photocurable composition of the present invention contains at least one photopolymerizable compound. The photopolymerizable compound that can be used in the present invention is an addition-polymerizable compound having at least one ethylenically unsaturated double bond, and a compound having at least one terminal ethylenically unsaturated bond, preferably two or more. Chosen from. Such a compound group is widely known in the industrial field, and can be used without any particular limitation in the present invention. These have chemical forms such as monomers, prepolymers, i.e. dimers, trimers and oligomers, or mixtures thereof and copolymers thereof. Examples of monomers and copolymers thereof include unsaturated carboxylic acids (for example, acrylic acid, methacrylic acid, itaconic acid, crotonic acid, isocrotonic acid, maleic acid, etc.), and esters and amides thereof. In this case, an ester of an unsaturated carboxylic acid and an aliphatic polyhydric alcohol compound, or an amide of an unsaturated carboxylic acid and an aliphatic polyvalent amine compound is used. In addition, an addition reaction product of an unsaturated carboxylic acid ester or amide having a nucleophilic substituent such as a hydroxyl group, amino group or mercapto group with a monofunctional or polyfunctional isocyanate or epoxy, and monofunctional or polyfunctional A dehydration condensation reaction product with a functional carboxylic acid is also preferably used. Further, an addition reaction product of an unsaturated carboxylic acid ester or amide having an electrophilic substituent such as an epoxy group or an epoxy group with a monofunctional or polyfunctional alcohol, amine or thiol, a halogen group or In addition, a substitution reaction product of an unsaturated carboxylic acid ester or amide having a leaving substituent such as a tosyloxy group and a monofunctional or polyfunctional alcohol, amine or thiol is also suitable. As another example, it is also possible to use a group of compounds substituted with unsaturated phosphonic acid, styrene, vinyl ether or the like instead of the unsaturated carboxylic acid.

  Also, urethane acrylates such as those described in JP-A-51-37193, JP-B-2-32293, and JP-B-2-16765, JP-B-58-49860, JP-B-56-17654, Urethane compounds having an ethylene oxide skeleton described in JP-B-62-39417 and JP-B-62-39418 are also suitable. Further, by using addition polymerizable compounds having an amino structure or a sulfide structure in the molecule described in JP-A-63-277653, JP-A-63-260909, and JP-A-1-105238, It is possible to obtain a photopolymerizable composition excellent in the photosensitive speed.

  Other examples include polyester acrylates, epoxy resins and (meth) acrylic acid as described in JP-A-48-64183, JP-B-49-43191, JP-B-52-30490, and JP-A-52-30490. Mention may be made of polyfunctional acrylates and methacrylates such as reacted epoxy acrylates. Further, specific unsaturated compounds described in JP-B-46-43946, JP-B-1-40337 and JP-B-1-40336, vinylphosphonic acid compounds described in JP-A-2-25493, and the like can also be mentioned. . In some cases, a structure containing a perfluoroalkyl group described in JP-A-61-22048 is preferably used. Furthermore, Journal of Japan Adhesion Association vol. 20, no. 7, pages 300 to 308 (1984), which are introduced as photocurable monomers and oligomers, can also be used.

About these addition polymerizable compounds, the details of usage, such as the structure, single use or combination, addition amount, etc., can be arbitrarily set according to the performance design of the final photosensitive material. For example, it is selected from the following viewpoints.
From the viewpoint of sensitivity, a structure having a large unsaturated group content per molecule is preferable, and in many cases, a bifunctional or higher functionality is preferable. Further, in order to increase the strength of the image area, that is, the cured film, those having three or more functionalities are preferable. A method of adjusting both sensitivity and strength by using a compound) is also effective. From the viewpoint of curing sensitivity, it is preferable to use a compound containing two or more (meth) acrylic acid ester structures, more preferably a compound containing three or more, and most preferably a compound containing four or more. preferable. Moreover, it is preferable to contain an EO modified body from a viewpoint of hardening sensitivity and the developability of an unexposed part. Moreover, it is preferable to contain a urethane bond from a viewpoint of hardening sensitivity and exposure part intensity | strength.
Also, the selection and use method of the addition polymerization compound is important for the compatibility and dispersibility with other components in the polymerizable layer (for example, alkali-soluble resin, initiator, colorant (pigment, dye, etc.)). For example, the compatibility may be improved by using a low-purity compound or a combination of two or more kinds, and a specific structure for the purpose of improving the adhesion of a substrate, an overcoat layer described later, etc. May also be selected.

  From the above viewpoints, bisphenol A diacrylate, modified bisphenol A diacrylate EO, trimethylolpropane triacrylate, trimethylolpropane tri (acryloyloxypropyl) ether, trimethylolethane triacrylate, tetraethylene glycol diacrylate, pentaerythritol diacrylate Acrylate, pentaerythritol triacrylate, pentaerythritol tetraacrylate, dipentaerythritol tetraacrylate, dipentaerythritol pentaacrylate, dipentaerythritol hexaacrylate, sorbitol triacrylate, sorbitol tetraacrylate, sorbitol pentaacrylate, sorbitol hexaacrylate, tri (acryloyloxy D (I) Isocyanurate, pentaerythritol tetraacrylate EO modified product, dipentaerythritol hexaacrylate EO modified product, etc. are mentioned as preferable ones. Also, as commercially available products, urethane oligomer UAS-10, UAB-140 (Sanyo Kokusaku Pulp Co., Ltd.) Made), DPHA-40H (made by Nippon Kayaku Co., Ltd.), UA-306H, UA-306T, UA-306I, AH-600, T-600, AI-600 (made by Kyoeisha).

Among them, bisphenol A diacrylate EO modified product, pentaerythritol triacrylate, pentaerythritol tetraacrylate, dipentaerythritol pentaacrylate, dipentaerythritol hexaacrylate, tri (acryloyloxyethyl) isocyanurate, pentaerythritol tetraacrylate EO modified product, Dipentaerythritol hexaacrylate EO modified products such as DPHA-40H (manufactured by Nippon Kayaku Co., Ltd.), UA-306H, UA-306T, UA-306I, AH-600, T-600, AI-600 are commercially available products. (Manufactured by Kyoeisha) is more preferred.
The photopolymerizable compound can be used in combination of two or more, in addition to being used alone.

As content in the photocurable composition of a photopolymerizable compound, it is preferable that it is 1-90 mass% with respect to the total solid of this composition, and it is more preferable that it is 5-80 mass%. More preferably, it is 10-70 mass%. When the content of the photopolymerizable compound is within the above range, the curing reaction can be sufficiently performed.
In particular, when the photocurable composition of the present invention is used for forming a colored pattern for a color filter, the content is preferably 5 to 50% by mass, more preferably 7 to 40% by mass. The content is preferably 10 to 35% by mass.

  The photocurable composition of the present invention contains at least one photopolymerization initiator. The photopolymerization initiator in the present invention is a compound that is decomposed by light and initiates and accelerates polymerization of a compound containing an ethylenically unsaturated bond, which will be described later, and has absorption in a wavelength region of 300 to 500 nm. Is preferred. Moreover, a photoinitiator can be used individually or in combination of 2 or more types.

  Examples of the photopolymerization initiator include organic halogenated compounds, oxydiazole compounds, carbonyl compounds, ketal compounds, benzoin compounds, acridine compounds, organic peroxide compounds, azo compounds, coumarin compounds, azide compounds, metallocene compounds, hexaaryls. Examples include rubiimidazole compounds, organic boric acid compounds, disulfonic acid compounds, oxime ester compounds, onium salt compounds, and acylphosphine (oxide) compounds.

  Specific examples of the organic halogenated compound include Wakabayashi et al., “Bull Chem. Soc Japan” 42, 2924 (1969), US Pat. No. 3,905,815, Japanese Patent Publication No. 46-4605, JP 48-36281, JP 55-3070, JP 60-239736, JP 61-169835, JP 61-169837, JP 62-58241, JP 62 -212401, JP-A-63-70243, JP-A-63-298339, M.S. P. Examples include compounds described in Hutt “Journal of Heterocyclic Chemistry” 1 (No 3), (1970) ”, and in particular, oxazole compounds substituted with a trihalomethyl group and s-triazine compounds.

  Examples of the carbonyl compound include benzophenone derivatives, acetophenone derivatives, and thioxanthone derivatives.

  Examples of the ketal compound include benzyl methyl ketal and benzyl-β-methoxyethyl ethyl acetal.

  Examples of the benzoin compound include benzoin isopropyl ether, benzoin isobutyl ether, benzoin methyl ether, and methyl o-benzoylbenzoate.

  Examples of the acridine compound include 9-phenylacridine, 1,7-bis (9-acridinyl) heptane, and the like.

  Examples of the organic peroxide compound include trimethylcyclohexanone peroxide, acetylacetone peroxide, 1,1-bis (tert-butylperoxy) -3,3,5-trimethylcyclohexane, 3,3 ′, 4,4′- Tetra- (t-hexylperoxycarbonyl) benzophenone, 3,3 ′, 4,4′-tetra- (p-isopropylcumylperoxycarbonyl) benzophenone, carbonyldi (t-butylperoxydihydrogen diphthalate), carbonyl And di (t-hexylperoxydihydrogen diphthalate).

  Examples of the azo compound include azo compounds described in JP-A-8-108621.

  Examples of the coumarin compound include 3-methyl-5-amino-((s-triazin-2-yl) amino) -3-phenylcoumarin, 3-chloro-5-diethylamino-((s-triazin-2-yl). ) Amino) -3-phenylcoumarin, 3-butyl-5-dimethylamino-((s-triazin-2-yl) amino) -3-phenylcoumarin, and the like.

  Examples of the azide compound include organic azide compounds described in U.S. Pat. No. 2,848,328, U.S. Pat. No. 2,852,379 and U.S. Pat. No. 2,940,553, 2,6-bis (4-azidobenzylidene) -4-ethyl. And cyclohexanone (BAC-E).

  Examples of the metallocene compound include JP-A-59-152396, JP-A-61-151197, JP-A-63-41484, JP-A-2-249, JP-A-2-4705, Examples thereof include various titanocene compounds described in JP-A-5-83588, and iron-arene complexes described in JP-A-1-304453 and JP-A-1-152109.

  As the hexaarylbiimidazole compound, for example, JP-B-6-29285, US Pat. Nos. 3,479,185, 4,311,783, 4,622,286, etc. And various compounds described in the above.

  Examples of the organic borate compound include JP-A-62-143044, JP-A-62-1050242, JP-A-9-188585, JP-A-9-188686, JP-A-9-188710, JP-A-2000. -131837, Japanese Patent Application Laid-Open No. 2002-107916, Japanese Patent No. 2764769, Japanese Patent Application No. 2000-310808, etc., and Kunz, Martin “Rad Tech '98. Proceeding April 19-22, 1998, Chicago”. Organic borate salts described in JP-A-6-157623, JP-A-6-175564, JP-A-6-175561, and organic boron oxosulfonium complexes, JP-A-6-175554 Publication, JP-A-6-175553 The organic boron iodonium complex described in JP-A-9-188710, the organic boron phosphonium complex described in JP-A-9-188710, JP-A-6-348011, JP-A-7-128785, JP-A-7-140589, JP-A-7- Specific examples include organoboron transition metal coordination complexes such as those described in Japanese Patent No. 306527 and Japanese Patent Laid-Open No. 7-292014.

  Examples of the disulfone compound include compounds described in JP-A No. 61-166544 and Japanese Patent Application No. 2001-132318.

  Examples of oxime ester compounds include J.M. C. S. Perkin II (1979) 1653-1660), J. MoI. C. S. Perkin II (1979) 156-162, Journal of Photopolymer Science and Technology (1995) 202-232, Japanese Patent Application Laid-Open No. 2000-66385, Japanese Patent Application Laid-Open No. 2000-80068, Japanese Patent Application Publication No. 2004-534797 Compounds and the like.

  Examples of onium salt compounds include S.I. I. Schlesinger, Photogr. Sci. Eng. 18, 387 (1974), T .; S. Bal et al, Polymer, 21, 423 (1980), diazonium salts described in U.S. Pat. No. 4,069,055, ammonium salts described in JP-A-4-365049, U.S. Pat. No. 4,069, No. 055, No. 4,069,056, phosphonium salts described in European Patent Nos. 104 and 143, U.S. Pat. Nos. 339,049 and 410,201, JP Examples include iodonium salts described in JP-A No. -150848 and JP-A-2-296514.

  Examples of the acylphosphine (oxide) compound include Irgacure 819, Darocur 4265, Darocur TPO and the like manufactured by Ciba Specialty Chemicals.

  As content in the photocurable composition of a photoinitiator, it is preferable that it is 0.1-50 mass% with respect to the total solid of this composition, More preferably, it is 0.5-30 mass. %, Particularly preferably 1 to 20% by mass. Within this range, good sensitivity and pattern formability can be obtained.

Next, components other than the above will be described.
In general, the pigment dispersion composition and photocurable composition of the present invention can be suitably prepared using a solvent together with the above components.
Examples of the solvent include esters such as ethyl acetate, n-butyl acetate, isobutyl acetate, amyl formate, isoamyl acetate, isobutyl acetate, butyl propionate, isopropyl butyrate, ethyl butyrate, butyl butyrate, alkyl esters, methyl lactate, and lactic acid. Ethyl, methyl oxyacetate, ethyl oxyacetate, butyl oxyacetate, methyl methoxyacetate, ethyl methoxyacetate, butyl methoxyacetate, methyl ethoxyacetate, ethyl ethoxyacetate, and methyl 3-oxypropionate and ethyl 3-oxypropionate 3-oxypropionic acid alkyl esters (for example, methyl 3-methoxypropionate, ethyl 3-methoxypropionate, methyl 3-ethoxypropionate, ethyl 3-ethoxypropionate), and 2-oxypropion 2-oxypropionic acid alkyl esters such as methyl, ethyl 2-oxypropionate, and propyl 2-oxypropionate (eg, methyl 2-methoxypropionate, ethyl 2-methoxypropionate, propyl 2-methoxypropionate, Methyl 2-ethoxypropionate, ethyl 2-ethoxypropionate, methyl 2-oxy-2-methylpropionate, ethyl 2-oxy-2-methylpropionate, methyl 2-methoxy-2-methylpropionate, 2-ethoxy 2-methyl methyl propionate), and methyl pyruvate, ethyl pyruvate, propyl pyruvate, methyl acetoacetate, ethyl acetoacetate, methyl 2-oxobutanoate, ethyl 2-oxobutanoate and the like;
Ethers such as diethylene glycol dimethyl ether, tetrahydrofuran, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, methyl cellosolve acetate, ethyl cellosolve acetate, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, propylene glycol monomethyl ether acetate (herein) Among them, also referred to as “1-methoxy-2-propyl acetate”), propylene glycol monoethyl ether acetate, propylene glycol monopropyl ether acetate, etc .;
Ketones such as methyl ethyl ketone, cyclohexanone, 2-heptanone, 3-heptanone;
Aromatic hydrocarbons such as toluene, xylene and the like can be mentioned.

Of these, methyl 3-ethoxypropionate, ethyl 3-ethoxypropionate, ethyl cellosolve acetate, ethyl lactate, diethylene glycol dimethyl ether, butyl acetate, methyl 3-methoxypropionate, 2-heptanone, cyclohexanone, ethyl carbitol acetate, butyl Carbitol acetate, propylene glycol monomethyl ether acetate and the like are suitable.
You may use a solvent in combination of 2 or more types besides using it independently.

  The photocurable composition of the present invention may contain a sensitizer for the purpose of improving the radical generation efficiency of the radical initiator and increasing the photosensitive wavelength. As the sensitizer that can be used in the present invention, those that sensitize the above-mentioned photopolymerization initiator by an electron transfer mechanism or an energy transfer mechanism are preferable.

  In the pigment dispersion composition or the photocurable composition of the present invention, if necessary, a fluorine-based organic compound, a thermal polymerization inhibitor, a colorant, a photopolymerization initiator, other fillers, the above general formula (1) Alternatively, various additives such as a polymer compound other than the polymer compound represented by (2) and the alkali-soluble resin, a surfactant, an adhesion promoter, an antioxidant, an ultraviolet absorber, an aggregation inhibitor, and a thermal polymerization inhibitor Can be contained.

Next, a color filter and a manufacturing method thereof will be described.
The color filter preferably has a colored pattern on the support using the photocurable composition of the present invention. Hereinafter, the color filter will be described in detail through its manufacturing method.

  A method for producing a color filter includes a step of forming a photosensitive film by applying the photocurable composition of the present invention directly or via another layer (hereinafter referred to as “photosensitive film forming step” as appropriate). Abbreviated), a pattern exposure (exposed through a mask) of the formed photosensitive film (hereinafter abbreviated as “exposure process” as appropriate), and development of the exposed photosensitive film. And a step of forming a colored pattern (hereinafter abbreviated as “development step” as appropriate).

  In the photosensitive film forming step, the photocurable composition of the present invention is applied (applied) directly or on a substrate having another layer to form a photosensitive film. Examples of the substrate that can be used in this step include soda glass, Pyrex (registered trademark) glass, quartz glass, and those in which a transparent conductive film is attached to these substrates, photoelectric sensors used in image sensors, and the like. Examples include a conversion element substrate such as a silicon substrate and a complementary metal oxide semiconductor (CMOS). These substrates may have black stripes that separate pixels. Further, if necessary, an undercoat layer (other layers) may be provided on these substrates for improving adhesion to the upper layer, preventing diffusion of substances, or flattening the substrate surface.

  As a coating method of the photocurable composition of the present invention on the substrate, various coating methods such as slit coating, ink jet method, spin coating, cast coating, roll coating, screen printing method and the like can be applied. As a coating film thickness of a photocurable composition, 0.1-10 micrometers is preferable, 0.2-5 micrometers is more preferable, 0.2-3 micrometers is further more preferable. The photosensitive film coated on the substrate can be dried (prebaked) at a temperature of 50 ° C. to 140 ° C. for 10 to 300 seconds using a hot plate, an oven, or the like.

In the exposure step, the photosensitive film formed in the photosensitive film forming step is exposed through a mask having a predetermined mask pattern, that is, pattern exposure is performed. In this step, only the coating film portion irradiated with light can be cured by exposing the photosensitive film as the coating film through a predetermined mask pattern. As radiation that can be used for exposure, ultraviolet rays such as g-line and i-line are particularly preferably used. Irradiation dose is more preferably preferably ^{10~1000mJ / cm 2 5~1500mJ / cm 2} , and most preferably 10 to 500 mJ / cm ^2. If a color filter is for a liquid crystal display device, it is more preferably preferably 10~150mJ / cm ² 5~200mJ / cm ² within the above range, and most preferably 10 to 100 mJ / cm ^2. Further, if a color filter is for a solid-state imaging device, it is more preferably preferably 50~1000mJ / cm ² 30~1500mJ / cm ² within the above range, and most preferably 80~500mJ / cm ^2.

  Next, by performing development processing, the unexposed portion in the exposure step is eluted in the developer, and only the photocured portion remains. Any developer can be used as long as it dissolves the film of the photocurable composition in the uncured part while not dissolving the cured part. Specifically, a combination of various organic solvents or an alkaline aqueous solution can be used. The development temperature is usually 20 ° C. to 30 ° C., and the development time is 20 to 90 seconds.

  Examples of the organic solvent include the solvents described above that can be used in preparing the pigment dispersion composition or the photocurable composition of the present invention. Examples of the alkaline aqueous solution include sodium hydroxide, potassium hydroxide, sodium carbonate, sodium hydrogencarbonate, sodium oxalate, sodium metasuccinate, aqueous ammonia, ethylamine, diethylamine, dimethylethanolamine, tetramethylammonium hydroxide, Concentration of an alkaline compound such as tetraethylammonium hydroxide, choline, pyrrole, piperidine, 1,8-diazabicyclo- [5,4,0] -7-undecene, in a concentration of 0.001 to 10% by mass, preferably 0.01 to An alkaline aqueous solution diluted with pure water so as to be 1% by mass is preferably used as the developer. In the case where a developer composed of such an alkaline aqueous solution is used, it is generally washed (rinsed) with pure water after development.

  After the development step, excess developer is washed away and dried, followed by heat treatment (post-bake). The post-baking is a heat treatment after development for complete curing, and usually a heat curing treatment at 100 ° C. to 240 ° C. is performed. When the substrate is a glass substrate or a silicon substrate, 200 ° C. to 240 ° C. is preferable in the above temperature range. This post-bake treatment is performed continuously or batchwise using a heating means such as a hot plate, a convection oven (hot air circulation dryer), a high-frequency heater, or the like so that the coating film after development is in the above-described condition. be able to.

  By repeating the photosensitive film formation step, the exposure step, and the development step (and heat treatment as necessary) described above for the desired number of hues, a color filter having a desired hue is manufactured.

  When the film is formed by applying the photocurable composition of the present invention on a substrate, the dry thickness of the film is generally 0.3 to 5.0 μm, preferably 0.5 to 3.5 μm, Most desirably, the thickness is 1.0 to 2.5 μm.

  As the substrate, for example, non-alkali glass, soda glass, Pyrex (registered trademark) glass, quartz glass used for liquid crystal display elements and the like, and those obtained by attaching a transparent conductive film to these, solid-state imaging elements, etc. Examples of the photoelectric conversion element substrate include a silicon substrate and a plastic substrate. On these substrates, usually, black stripes for isolating each pixel are formed. The plastic substrate preferably has a gas barrier layer and / or a solvent resistant layer on its surface.

  As the application of the photocurable composition of the present invention, the application mainly to the pixel of the color filter has been mainly described, but it goes without saying that it can also be applied to a black matrix provided between the pixels of the color filter. The black matrix is the same as the above-described pixel manufacturing method except that a black colorant such as carbon black or titanium black is added as a colorant to the photocurable composition of the present invention. The film can be developed and then post-baked to accelerate the curing of the film.

(Example 1-1)
1,500 ml of dimethyl sulfoxide, 50.0 ml of 28% sodium methoxide methanol solution, pigment C.I. I. Pigment Red 254: (trade name, Irgafore Red BT-CF, manufactured by Ciba Specialty Chemicals Co., Ltd.) 80 g and a pigment solution A containing 85.0 g of polyvinylpyrrolidone were prepared. Separately from this, 1500 ml of water containing 20 ml of 1 mol / l hydrochloric acid was prepared as a poor solvent.

  Here, NP-KX-500 made by Nippon Seimitsu Chemical Co., Ltd. was added to 1500 ml of poor solvent water which was temperature controlled at 18 ° C. and stirred at 500 rpm by GK-0222-10 type Lamond Stirrer manufactured by Fujisawa Pharmaceutical Co., Ltd. Infusion was performed using a large-capacity non-pulsating pump. The flow path diameter and the supply port diameter of the liquid feeding pipe of the pigment solution A are 0.5 mm, and the organic filler particles are formed by injecting the supply port into a poor solvent and injecting 100 ml at a flow rate of 50 ml / min. Was prepared. The pigment dispersion was counted for 250 particles using a scanning microscope, and the particle size and monodispersity were measured. The number average particle size was 35 nm and Mv / Mn was 1.49.

  The pigment dispersion A obtained by the above-described method and obtained as a pigment nanoparticle dispersion was subjected to 60 at 3500 rpm using a H-112 type centrifugal filter manufactured by Kokusan Co., Ltd. and a P89C type filter cloth manufactured by Shikishima Canvas Co., Ltd. After concentration, the resulting pigment nanoparticle concentrated paste was recovered. When the pigment content of the paste was measured using an Agilent 8453 type spectrophotometer, it was 13.5% by mass.

By adding 70.0 cc of ethyl lactate to 25.0 g of the above pigment nanoparticle preparation paste, stirring at 1500 rpm for 60 minutes with a dissolver, and then filtering using a FP-010 type filter manufactured by Sumitomo Electric Fine Polymer Co., Ltd. Concentrated pigment liquid A (nanopigment concentration 29 mass%) was obtained.
[Preparation of pigment dispersion composition]
Using the paste, a pigment dispersion composition A having the following composition was prepared.
22.4 g of the concentrated pigment liquid A in paste form
Pigment dispersant A 8.1g
1-methoxy-2-propyl acetate 42.4 g

・ Pigment dispersant A
{Exemplified compound 1-12 (m / p ratio = 50/50 molar ratio)} / {One-end methacryloylated polymethyl methacrylate oligomer (Mn = 6000, trade name: AA-6, manufactured by Toa Gosei Chemical Co., Ltd.) )} Copolymer (mass ratio 8/92, mass average molecular weight: 20000, 40% 1-methoxy-2-propyl acetate solution)
The pigment dispersion composition having the above composition was dispersed with a motor mill M-50 (manufactured by Eiger Japan) for 1 hour at a peripheral speed of 9 m / s using zirconia beads having a diameter of 0.65 mm to obtain a pigment dispersion composition A. It was.

(Example 1-2)
A pigment dispersion composition B was prepared in the same manner as in Example 1-1 except that the pigment dispersant A was changed to the pigment dispersant B in the pigment dispersion composition A of Example 1-1. The pigment dispersion composition B was obtained in the same manner as in Example 1-1.

・ Pigment dispersant B
{Exemplified compound 1-11 (m / p ratio = 50/50 molar ratio)} / {One-end methacryloylated polymethyl methacrylate oligomer (Mn = 6000, trade name: AA-6, manufactured by Toa Gosei Chemical Co., Ltd.) )} Copolymer (mass ratio 8/92, mass average molecular weight: 21000, 40% 1-methoxy-2-propyl acetate solution)

(Example 1-3)
A pigment dispersion composition C was prepared in the same manner as in Example 1-1 except that in the pigment dispersion composition A of Example 1-1, the pigment dispersant A was changed to the pigment dispersant C. The pigment dispersion composition C was obtained in the same manner as in Example 1-1.

・ Pigment dispersant C
{Exemplified compound 1-7 / {One-end methacryloylated polymethyl methacrylate oligomer (Mn = 6000, trade name: AA-6, manufactured by Toagosei Co., Ltd.)} copolymer (mass ratio 10/90, mass (Average molecular weight: 19000, 40% 1-methoxy-2-propyl acetate solution)

(Example 1-4)
A pigment dispersion composition D was prepared in the same manner as in Example 1-1 except that in the pigment dispersion composition A of Example 1-1, the pigment dispersant A was changed to the pigment dispersant D. The pigment dispersion composition D was obtained in the same manner as in Example 1-1.

・ Pigment dispersant D
{Exemplified compound 1-1 / {One-end methacryloylated polymethyl methacrylate oligomer (Mn = 6000, trade name: AA-6, manufactured by Toa Gosei Chemical Co., Ltd.)} copolymer (molar ratio 7/93, mass) (Average molecular weight: 20000, 40% 1-methoxy-2-propyl acetate solution)

(Comparative Example 1-1)
A pigment dispersion composition E was prepared in the same manner as in Example 1-1 except that the pigment dispersant A was changed to the pigment dispersant E in the pigment dispersion composition A of Example 1-1. The pigment dispersion composition E was obtained in the same manner as in Example 1-1.

・ Pigment dispersant E
{Methyl methacrylate / {One-end methacryloylated polymethyl methacrylate oligomer (Mn = 6000, trade name: AA-6, manufactured by Toagosei Co., Ltd.)} copolymer (molar ratio 8/92, mass average molecular weight: 20,000, 40% 1-methoxy-2-propyl acetate solution)

The following reagents were used for the preparation of the pigment dispersion compositions A to E.
-----------------------------------
Reagent Manufacturer ------------------------------------
Pigment Red 254 (Irga Fore Red BT-CF)
Ciba Specialty Chemicals 1-methyl-2-pyrrolidone Wako Pure Chemical Industries dimethyl sulfoxide Wako Pure Chemical Industries 2- (1-methoxy) propyl acetate Wako Pure Chemical Industries 1 mol / l Hydrochloric acid aqueous solution Wako Pure Chemical Industries 8 mol / l potassium hydroxide aqueous solution Wako Pure Chemical Industries, Ltd. ----------------------------------

The obtained pigment dispersion compositions A to E were each applied on a glass substrate so as to have a thickness of 2 μm, thereby preparing samples. As a backlight unit, a three-wavelength cold cathode tube light source (FWL18EX-N manufactured by Toshiba Lighting & Technology Co., Ltd.) with a diffusion plate installed was used, and two polarizing plates (polarizing plates HLC2-2518 manufactured by Sanritsu Co., Ltd.) were used. ), The amount of transmitted light when the polarization axis is parallel and vertical is measured, and the ratio is defined as the contrast (“1990 Seventh Color Optical Conference, 512-color display 10. 4 ”size TFT-LCD color filter, planting, Koseki, Fukunaga, Yamanaka etc.). A color luminance meter (BM-5 manufactured by Topcon Corporation) was used for the measurement of chromaticity. Two polarizing plates, a sample, and a color luminance meter are installed at a position 13 mm from the backlight, a polarizing plate at a position 40 mm to 60 mm, a cylinder 11 mm in diameter and 20 mm in length, and light transmitted through this. Was measured on a color luminance meter installed at a position of 400 mm through a polarizing plate installed at a position of 100 mm. The measurement angle of the color luminance meter was set to 2 °. The amount of light of the backlight was set so that the luminance when the two polarizing plates were installed in parallel Nicol was 1280 cd / m ² without the sample being installed.

This sample was irradiated with a 90 mW / cm ² high-pressure mercury lamp for 24 hours, and the color difference before and after the irradiation was measured to provide an index of light resistance. In the present invention, the chromaticity is measured with a microspectrophotometer (manufactured by Olympus Optical Co., Ltd .; OSP100 or 200), calculated as a result of the F10 light source field of view of 2 degrees, and expressed as an xyY value in the xyz color system. The difference in chromaticity is represented by the color difference of the La ^* b ^* color system. The smaller the color difference, the better.

  Table 1 shows the measurement results of contrast and light resistance of the samples obtained from the pigment dispersion compositions A to E.

[Table 1]
----------------------------
Sample Contrast Remarks ----------------------------
Pigment Dispersion Composition A 17500 Present Invention Pigment Dispersion Composition B 18000 Present Invention Pigment Dispersion Composition C 17600 Present Invention Pigment Dispersion Composition D 18000 Present Invention Pigment Dispersion Composition E 15000 Comparative Example ---------- -------------------

  As shown in Table 1, the pigment dispersion composition of the present invention showed higher contrast than that of the comparative example.

(Example 2-1)
While heating 2500 ml of methanesulfonic acid (first solvent) (manufactured by Wako Pure Chemical Industries, Ltd.) to 80 ° C., the pigment C.I. I. A pigment solution F was prepared by adding 112.5 g of Pigment Violet 23 (manufactured by Clariant, Hostaperm Violet RL-NF) and 80.0 g of polyvinylpyrrolidone (K-30, trade name, manufactured by Wako Pure Chemical Industries, Ltd.).
Separately, 2000 ml of water containing 20 ml of a 1 mol / l sodium hydroxide solution (manufactured by Wako Pure Chemical Industries, Ltd.) was prepared as a poor solvent (second solvent).

  Here, the temperature was controlled at 25 ° C., and NP was added to the pigment solution A at 80 ° C. in 2000 ml of poor solvent water stirred at 500 rpm by a GK-0222-10 type Lamond Stirrer (trade name, manufactured by Fujisawa Pharmaceutical Co., Ltd.). -KX-500 type large capacity non-pulsating flow pump (trade name, manufactured by Nippon Seimitsu Chemical Co., Ltd.) was used for injection. By setting the flow path diameter and the supply port diameter of the liquid feeding pipe of the pigment solution F to 2.2 mm, placing the supply port in a poor solvent, and injecting 220 ml at a flow rate of 200 ml / min, organic pigment particles are formed, and the pigment dispersion liquid F was prepared. When 250 particles of this pigment dispersion were counted using a scanning microscope and the particle size and monodispersity were measured, the number average particle size was 34 nm and Mv / Mn was 1.50.

  The pigment dispersion F prepared by the above procedure was concentrated at 3000 rpm for 90 minutes using an H-110A type centrifugal filter manufactured by Kokusan Co., Ltd. and a P89C type cloth manufactured by Shikishima Canvas Co., Ltd. The solvent content was removed from the solution and reduced (first concentration / removal step), and the pigment nanoparticle concentrated paste was recovered. The pigment content of the paste was measured using an Agilent 8453 type spectrophotometer and found to be 15.0% by mass.

  A solution obtained by adding 6.0 g of the pigment dispersant A to 80.0 cc of ethyl lactate (third solvent) was added to 16.1 g of the pigment nanoparticle concentrated paste. This was stirred at 1200 rpm for 80 minutes with a dissolver, further 30.0 cc of ethyl acetate was added, and stirred at 500 rpm for 10 minutes with a dissolver to obtain a dispersion.

  By filtering this dispersion using a FP-010 filter manufactured by Sumitomo Electric Fine Polymer Co., Ltd. (second concentration / removal step), a paste-like concentrated pigment liquid F (nano-pigment concentration: 30.5% by mass) Got.

Using the pasty concentrated pigment liquid F, a pigment dispersion composition F having the following composition was prepared.
21.1 g of the paste-like concentrated pigment liquid F
1-Methoxy-2-propyl acetate 43.2g

  The pigment dispersion composition F having the above composition was dispersed with a motor mill M-50 (manufactured by Eiger Japan) for 2 hours at a peripheral speed of 9 m / s using zirconia beads having a diameter of 0.65 mm.

(Example 2-2)
In Example 2-1, the pigment dispersion A was exactly the same as the pigment dispersion F, except that 6.0 g of the pigment dispersant A used in the preparation of the paste-like concentrated pigment liquid F was replaced with 6.0 g of the pigment dispersant B. G was produced.

(Example 2-3)
In Example 2-1, the pigment dispersion A was exactly the same as the pigment dispersion F, except that 6.0 g of the pigment dispersant A used in the preparation of the paste-like concentrated pigment liquid F was replaced with 6.0 g of the pigment dispersant C. H was produced.

(Example 2-4)
In Example 2-1, the pigment dispersion A was completely the same as the pigment dispersion F except that 6.0 g of the pigment dispersant A used in the preparation of the paste-like concentrated pigment liquid F was replaced with 6.0 g of the pigment dispersant D. I was produced.

(Comparative Example 2-1)
A pigment dispersion composition J was prepared in the same manner as in Example 2-1, except that the pigment dispersant A was changed to the pigment dispersant E in the pigment dispersion composition F of Example 2-1. The pigment dispersion composition J was obtained in the same manner as in Example 2-1.

[Contrast measurement]
The obtained pigment dispersion compositions F to J were each applied on a glass substrate so as to have a thickness of 2 μm, thereby preparing samples. As a backlight unit, a three-wavelength cold cathode tube light source (FWL18EX-N manufactured by Toshiba Lighting & Technology Co., Ltd.) with a diffusion plate installed was used, and two polarizing plates (polarizing plates HLC2-2518 manufactured by Sanritsu Co., Ltd.) were used. ), The amount of transmitted light when the polarization axis is parallel and vertical is measured, and the ratio is defined as the contrast (“1990 Seventh Color Optical Conference, 512-color display 10. 4 ”size TFT-LCD color filter, planting, Koseki, Fukunaga, Yamanaka etc.). Two polarizing plates, a sample, and a color luminance meter are installed at a position 13 mm from the backlight, a polarizing plate at a position 40 mm to 60 mm, a cylinder 11 mm in diameter and 20 mm in length, and light transmitted through this. Was measured on a color luminance meter installed at a position of 400 mm through a polarizing plate installed at a position of 100 mm. The measurement angle of the color luminance meter was set to 2 °. The amount of light of the backlight was set so that the luminance when the two polarizing plates were installed in parallel Nicol was 1280 cd / m ² without the sample being installed.

  Table 2 shows the measurement results of the contrast of the samples obtained from the pigment dispersion compositions F to J.

[Table 2]
----------------------------
Sample Contrast Remarks ----------------------------
Pigment Dispersion Composition F 15000 Present Invention Pigment Dispersion Composition G 15500 Present Invention Pigment Dispersion Composition H 16000 Present Invention Pigment Dispersion Composition I 16000 Present Invention Pigment Dispersion Composition J 7500 Comparative Example ---------- -------------------

  As shown in Table 2, the pigment dispersion composition of the present invention exhibited extremely excellent contrast as compared with the comparative example.

(Example 3)
[Preparation of color filter (preparation by application using slit nozzle)]
[Formation of black (K) image]
The alkali-free glass substrate was cleaned with a UV cleaning apparatus, then brush-cleaned with a cleaning agent, and further ultrasonically cleaned with ultrapure water. The substrate was heat-treated at 120 ° C. for 3 minutes to stabilize the surface state.
After cooling the substrate and adjusting the temperature to 23 ° C., the composition described in Table 3 below is applied on a glass substrate coater (manufactured by FS Asia Co., Ltd., trade name: MH-1600) having a slit-like nozzle. A colored photosensitive resin composition K1 was applied. Subsequently, a part of the solvent was dried by VCD (vacuum drying apparatus; manufactured by Tokyo Ohka Kogyo Co., Ltd.) for 30 seconds to eliminate the fluidity of the coating layer, and then pre-baked at 120 ° C. for 3 minutes to obtain a film thickness of A 4 μm photosensitive resin layer K1 was obtained.

[Table 3]
----------------------------------
Composition component K content (parts by mass)
----------------------------------
K pigment dispersion 1 (carbon black) 25
Propylene glycol monomethyl ether acetate 8.0
Methyl ethyl ketone 53
Binder 2 9.1
Hydroquinone monomethyl ether 0.002
DPHA solution 4.2
Polymerization initiator A 0.16
Surfactant 1 0.044
----------------------------------

In a proximity type exposure machine (manufactured by Hitachi High-Tech Electronics Engineering Co., Ltd.) having an ultra-high pressure mercury lamp, with the substrate and mask (quartz exposure mask having an image pattern) standing vertically, the exposure mask surface and the mask The distance between the photosensitive resin layers was set to 200 μm, and pattern exposure was performed at an exposure amount of 300 mJ / cm ² .
Next, after spraying pure water with a shower nozzle to uniformly wet the surface of the photosensitive resin layer K1, a KOH developer (KOH, containing nonionic surfactant, trade name: CDK-1, (Fujifilm Electronics Materials Co., Ltd.) was subjected to shower development at 23 ° C. for 80 seconds and a flat nozzle pressure of 0.04 MPa to obtain a patterning image. Subsequently, ultrapure water was sprayed at a pressure of 9.8 MPa with an ultrahigh pressure washing nozzle to remove the residue, and a black (K) image K was obtained. Subsequently, heat treatment was performed at 220 ° C. for 30 minutes.

[Formation of red (R) pixels]
A heat-treated pixel R was formed in the same process as the formation of the black (K) image using the colored photosensitive resin composition R1 having the composition shown in Table 4 below on the substrate on which the image K was formed.
The film thickness of the photosensitive resin layer R1 and the coating amount of pigments (CIPR 254 and CIPR 177) are shown below.
Photosensitive resin film thickness (μm) 1.60
Pigment coating amount (g / m ² ) 1.00
C. I. P. R. 254 coating amount (g / m ² ) 0.70
C. I. P. R. 177 coating amount (g / m ² ) 0.30

[Table 4]
----------------------------------
Composition component Content (parts by mass)
----------------------------------
R Pigment Dispersion 1 (C.I.P.R.254) 35
R pigment dispersion 2 (C.I.P.R.177) 6.8
Propylene glycol monomethyl ether acetate 7.6
Methyl ethyl ketone 37
Binder 1 0.7
DPHA solution 3.8
Polymerization initiator B 0.12
Polymerization initiator A 0.05
Phenothiazine 0.01
Surfactant 1 0.06
----------------------------------

[Formation of green (G) pixels]
Using the colored photosensitive resin composition G1 having the composition shown in Table 5 below on the substrate on which the image K and the pixel R are formed, the heat-treated pixel G is formed in the same process as the formation of the black (K) image. Formed. The film thickness of the photosensitive resin layer G1 and the coating amounts of pigments (CIPG36 and CIPY150) are shown below.
Photosensitive resin film thickness (μm) 1.60
Pigment application amount (g / m ² ) 1.92
C. I. P. G. 36 coating amount (g / m ² ) 1.34
C. I. P. Y. 150 coating amount (g / m ² ) 0.58

[Table 5]
----------------------------------
Composition component Content (parts by mass)
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G Pigment Dispersion 1 (C.I.P.G.36) 28
Y pigment dispersion 1 (C.I.P.Y.150) 15
Propylene glycol monomethyl ether acetate 29
Methyl ethyl ketone 26
Cyclohexanone 1.3
Binder 2 2.5
DPHA solution 3.5
Polymerization initiator B 0.12
Polymerization initiator A 0.05
Phenothiazine 0.01
Surfactant 1 0.07
----------------------------------

[Formation of blue (B) pixels]
Using the colored photosensitive resin composition B1 having the composition shown in Table 6 below on the substrate on which the image K, the pixel R, and the pixel G are formed, heat treatment is performed in the same process as the formation of the black (K) image. Pixel B was formed, and the target color filter A was obtained.
The film thickness of the photosensitive resin layer B1 and the coating amount of pigments (CIPB15: 6 and CIPVV23) are shown below.
Photosensitive resin film thickness (μm) 1.60
Pigment application amount (g / m ² ) 0.75
C. I. P. B. 15: 6 coating amount (g / m ² ) 0.45
C. I. P. V. 23 coating amount (g / m ² ) 0.30

[Table 6]
----------------------------------
Composition component Content (parts by mass)
----------------------------------
B pigment dispersion 1 (C.I.P.B.15: 6) 15.0
V Pigment dispersion composition A (CIPV23) 7.5
Propylene glycol monomethyl ether acetate 28
Methyl ethyl ketone 26
Binder 3 17
DPHA solution 4.0
Polymerization initiator B 0.17
Phenothiazine 0.02
Surfactant 1 0.06
----------------------------------

Here, the preparation of the colored photosensitive resin compositions K1, R1, G1, and B1 described in Tables 3 to 6 will be described in more detail.
The colored photosensitive resin composition K1 is first weighed in K pigment dispersion 1 and propylene glycol monomethyl ether acetate in the amounts shown in Table 3, mixed at a temperature of 24 ° C. (± 2 ° C.), and stirred at 150 rpm for 10 minutes. Then, methyl ethyl ketone, binder 2, hydroquinone monomethyl ether, DPHA solution, polymerization initiator A (2,4-bis (trichloromethyl) -6- [4 ′-(N, N-bisethoxycarbonyl) in the amounts shown in the table Methyl) amino-3′-bromophenyl] -s-triazine) and surfactant 1 are weighed out and added in this order at a temperature of 25 ° C. (± 2 ° C.) and at a temperature of 40 ° C. (± 2 ° C.) at 150 rpm. Obtained by stirring for 30 minutes.

In addition, the composition was shown below about the following component among the compositions of Table 3.
<K pigment dispersion 1>
・ Carbon black (trade name: Nipex 35, manufactured by Degussa Japan Co., Ltd.)
13.1 parts by mass / Pigment Dispersant F (see JP 2000-239554 A) 0.65 parts by mass / polymer (benzyl methacrylate / methacrylic acid = 72/28 molar ratio)
Random copolymer of, molecular weight 37,000) 6.72 parts by mass / propylene glycol monomethyl ether acetate 79.53 parts by mass

<Binder 2>
・ Polymer (benzyl methacrylate / methacrylic acid = 78/22 molar ratio
Random copolymer, molecular weight 38,000) 27 parts by mass / propylene glycol monomethyl ether acetate 73 parts by mass

The colored photosensitive resin composition R1 was first weighed in the amounts of Pigment Dispersion 1, R Pigment Dispersion 2, and Propylene Glycol Monomethyl Ether Acetate listed in Table 4 and mixed at a temperature of 24 ° C. (± 2 ° C.) at 150 rpm. For 10 minutes, and then the amounts of methyl ethyl ketone, binder 1, DPHA solution, polymerization initiator B (2-trichloromethyl-5- (p-styrylstyryl) -1,3,4-oxadi) in the amounts shown in Table 4 Azole), polymerization initiator A, and phenothiazine, add in this order at a temperature of 24 ° C. (± 2 ° C.), stir at 150 rpm for 30 minutes, and then weigh off the surfactant 1 in the amount shown in Table 2. The mixture was added at a temperature of 24 ° C. (± 2 ° C.), stirred at 30 rpm for 5 minutes, and filtered through nylon mesh # 200.
In addition, among the compositions described in Table 4, the pigment dispersions 1 and 2 were prepared by using the method described in Example 1 of International Publication No. WO2006 / 121016 pamphlet so that the composition became the following parts by mass. Each was prepared.
<R pigment dispersion 1>
・ C. I. P. R. 254 (Product name: Irgaphor Red BT-CF Ciba Specialty Chemicals Co., Ltd.)
10 parts by mass-Pigment dispersant F 1 part by mass-Polymer (benzyl methacrylate / methacrylic acid = 72/28 molar ratio
Random copolymer, molecular weight 30,000)
10 parts by mass / 79 parts by mass of propylene glycol monomethyl ether acetate <R pigment dispersion 2>
・ C. I. P. R. 177 (trade name: Chromophthal Red A2B, manufactured by Ciba Specialty Chemicals Co., Ltd.) 22.5 parts by mass / polymer (benzyl methacrylate / methacrylic acid = 72/28 molar ratio)
Random copolymer, molecular weight 30,000)
15 parts by mass / propylene glycol monomethyl ether acetate 62.5 parts by mass <Binder 1>
-27 parts by mass of polymer (benzyl methacrylate / methacrylic acid / methyl methacrylate = random copolymer of 38/25/37 molar ratio, molecular weight 40,000)-73 parts by mass of propylene glycol monomethyl ether acetate

  The colored photosensitive resin composition G1 was first weighed in the amounts of G pigment dispersion 1, Y pigment dispersion 1, and propylene glycol monomethyl ether acetate in the amounts shown in Table 5, and mixed at a temperature of 24 ° C. (± 2 ° C.). Stir at 150 rpm for 10 minutes, and then weigh out the amounts of methyl ethyl ketone, cyclohexanone, binder 2, DPHA solution, polymerization initiator B, polymerization initiator A, and phenothiazine shown in Table 5 at a temperature of 24 ° C. (± 2 ° C.). Add in this order and stir at 150 rpm for 30 minutes, then weigh out the amount of surfactant 1 listed in the table, add it at a temperature of 24 ° C. (± 2 ° C.), stir at 30 rpm for 5 minutes, nylon mesh # Obtained by filtering through 200.

  In addition, among the compositions described in Table 5, “trade name: GT-2” manufactured by FUJIFILM Electronics Materials Co., Ltd. was used as the G pigment dispersion 1. As the Y pigment dispersion 1, “trade name: CF erotic-EX3393” manufactured by Mikuni Color Co., Ltd. was used.

  The colored photosensitive resin composition B1 is first weighed out in amounts of B pigment dispersion 1, B pigment dispersion 2, and propylene glycol monomethyl ether acetate shown in Table 6 and mixed at a temperature of 24 ° C. (± 2 ° C.). Stir at 150 rpm for 10 minutes, then weigh out the amounts of methyl ethyl ketone, binder 3, DPHA solution, polymerization initiator B, phenothiazine described in Table 6 and add in this order at a temperature of 25 ° C. (± 2 ° C.). Stir at 40 ° C. (± 2 ° C.) at 150 rpm for 30 minutes, further weigh out the amount of surfactant 1 listed in the table, add it at a temperature of 24 ° C. (± 2 ° C.), stir at 30 rpm for 5 minutes, Obtained by filtering through nylon mesh # 200.

  Of the compositions shown in Table 6, “Brand Name: CF Bull-EX3357” manufactured by Mikuni Color Co., Ltd. was used as the B pigment dispersion 1. As the V pigment dispersion, the pigment dispersion A prepared in Example 2-1 was used.

The composition of the binder 3 is as follows.
<Binder 3>
-27 parts by mass of polymer (benzyl methacrylate / methacrylic acid / methyl methacrylate = 36/22/42 molar ratio random copolymer, molecular weight 37,000)-73 parts by mass of propylene glycol monomethyl ether acetate

  The color filter A was produced as described above. Color filters B to E were produced in the same manner as color filter A, except that pigment dispersion F, which is the V pigment dispersion used in color filter A, was replaced with pigment dispersions G to J, respectively. Table 7 shows the results of measuring the contrast and light resistance of each color filter in the same manner as in [Measurement of contrast].

[Table 7]
----------------------------
Contrast Remarks ----------------------------
Color Filter A 13000 Present Invention Color Filter B 13100 Present Invention Color Filter C 14000 Present Invention Color Filter D 13800 Present Invention Color Filter E 5000 Comparative Example ------------------- ----------

  From the above results, the color filters prepared from the pigment dispersion composition of the present invention were all good color filters with high contrast. On the other hand, the color filter of the comparative example has a low contrast.

Claims (4)

  The number average particle size of the primary particles is 50 nm or less, and the ratio of the number average particle size to the volume average particle size ([volume average particle size] / [number average particle size]) is 1.0 to 2.0. A pigment dispersion composition comprising organic pigment nanoparticles and a graft polymer having a repeating unit containing at least an organic dye residue in the backbone.   The graft polymer is a copolymer composed of at least a polymerizable monomer component having an organic dye residue and a polymerizable oligomer component having an ethylenically unsaturated double bond at a terminal. The pigment dispersion composition according to claim 1.   3. The pigment dispersion composition according to claim 1, wherein the graft polymer is a polymer in which a main chain or side chain of the graft polymer further contains a monomer having an acid group as a repeating unit. 4.   The photocurable composition for color filters containing the pigment dispersion composition of any one of Claims 1-3, a photopolymerizable compound, and a photoinitiator.