TW201925376A - Blue pigment dispersion composition for color filter of display device and blue pigment dispersion resist composition for color filter of display device having high coloring power and high brightness and capable of emitting blue color hue - Google Patents

Abstract

The present invention is to provide a blue pigment dispersion composition for a color filter with high coloring power and high brightness, which can be used for a color filter of a display device conforming to a new specification. As a solution, it is to provide a blue pigment dispersion composition for a color filter of a display device, which is a blue pigment dispersion composition for a color filer mainly composed of a coloring pigment, a pigment dispersing assistant, a resin, and an organic solvent, wherein said coloring pigment includes a C.I. Pigment Blue 15:16 and a zinc phthalocyaine-based green pigment.

Description

Color filter with blue pigment dispersion composition

The present invention relates to a blue pigment dispersion composition for a color filter which can be used for color filter formation of a color display device.

In recent years, almost all display devices of televisions, computers, mobile phones, and the like have been gradually occupied by liquid crystal color display devices. A color filter for a liquid crystal color display device generally has a transparent substrate, a coloring layer formed of a color pattern of three primary colors of a red pixel region, a green pixel region, and a blue pixel region formed on the transparent substrate, and A light shielding portion (black matrix) formed on the transparent substrate is distinguished from each of the colored patterns. These red pixel regions, green pixel regions, and blue pixel regions are structures in which a film of a synthetic resin in which an organic pigment is dispersed, which is excellent in heat resistance and light resistance, is provided on a substrate, and red, green, and Blue organic pigments.

As the backlight in the liquid crystal color display device, there are a type using a cold-cathode tube, a type using an LCD, a type using a white organic EL element, and the like. In addition, in the standard organization of each country, the RGBW color specification (BT.2020) in such a display device is adopted, and in the display device using the LCD, it is also desired to cope with the 4K8K television and respond to the new specification tape. A color filter that is enlarged by the color gamut. Further, in the blue color (B), there is a possibility that the conventional blue color filter for color filters cannot be sufficiently handled.

In addition, even if the color filter composition using the blue pigment and the violet pigment described in Patent Document 1 is used, sufficient coloring power and high luminance cannot be obtained, and the response to the display device of the new specification is not sufficient.
Prior art document patent document

Patent Document 1: Japanese Laid-Open Patent Publication No. 2013-148872

An object of the present invention is to provide a blue pigment dispersion composition for a color filter which has high coloring power and high luminance which can be used for a color filter of a display device according to a new standard.

The inventors of the present invention have conducted intensive studies to solve the above problems, and as a result, it has been found that by using CI Pigment Blue 15:6 and a zinc phthalocyanine-based green pigment as a coloring pigment, a pigment dispersing aid and a resin are used in combination to obtain an LCD. The color filter of a color filter of a display device of a light source or a white organic EL light source having a high coloring power and high luminance and having a suitable bluish hue color is dispersed with a blue pigment, thereby completing the present invention.

That is, the present invention is as follows:
(1) A blue pigment dispersion composition for a color filter of a display device, which is a blue pigment dispersion composition for a color filter mainly comprising a coloring pigment, a pigment dispersion aid, a resin, and an organic solvent, The coloring pigment contains CI Pigment Blue 15:6 and a zinc phthalocyanine-based green pigment.
(2) The blue pigment dispersion composition for a color filter of the display device according to (1), wherein the resin contains an alkali-soluble resin and a photopolymerizable compound.
(3) The blue pigment dispersion composition for a color filter of a display device according to (1) or (2), wherein a mass ratio of the CI Pigment Blue 15:6 to the zinc phthalocyanine-based green pigment It is 99.9: 0.1~90.0:10.0.
(4) The blue pigment dispersion composition for a color filter of the display device according to any one of (1) to (3), wherein the zinc phthalocyanine green pigment is CI Pigment Green 59 and CI Pigment Green 58 One or more of them.
(5) A blue pigment-dispersed resist composition for a color filter of a display device, which is a color filter of a display device mainly containing a coloring pigment, a pigment dispersing aid, a resin, a photopolymerizable compound, and an organic solvent. The sheet was dispersed with a blue pigment comprising a CI Pigment Blue 15:6 and a zinc phthalocyanine-based green pigment.
(6) The blue pigment-dispersed resist composition for a color filter of the display device according to (5), wherein the resin contains an alkali-soluble resin and a photopolymerizable compound.
(7) The blue pigment-dispersed resist composition for a color filter of a display device according to (5) or (6), wherein the CI Pigment Blue 15:6 and the zinc phthalocyanine-based green pigment The mass ratio is 99.9: 0.1~90.0:10.0.
(8) A blue pigment-dispersed resist composition for a color filter of a display device according to any one of (5) to (7), wherein the zinc phthalocyanine-based green pigment is CI Pigment Green 59 and CI One or more of the pigment greens 58.

According to the present invention, a blue pigment dispersion composition for a color filter which is excellent in dispersion stability while having high coloring power and high luminance can be obtained.
Hereinafter, each component of the color filter dispersion composition for a color filter of the display device of the present invention will be specifically described.

The present invention relates to a blue pigment dispersion composition for a color filter and a blue pigment dispersion resist composition for a color filter, and is a blue pigment dispersion composition for the color filter. It may also be a composition that is not a resist.
Regardless of the composition, the color filter dispersion composition for a color filter of the display device of the present invention is a composition of a color filter usable for a display device, and has high coloration as an effect of the present invention brought about by the present invention. A blue pigment dispersion composition for a color filter and a blue pigment dispersion resist composition for a color filter which can provide a display device and a high brightness.
The present invention is a blue pigment for a color filter, and a blue pigment for a color filter obtained by blending an alkali-soluble resin or a photopolymerizable compound with a blue pigment dispersion composition for the color filter. The resist composition is dispersed.
Further, the color filter dispersion composition for a color filter includes a photocurable type and a non-photocurable type.

[A. Composition of a color filter dispersion composition for a color filter]
The blue pigment dispersion composition for a color filter of the present invention mainly contains a coloring pigment, a pigment dispersing aid, a resin, and an organic solvent, and may be formulated with a pigment dispersing agent.

(pigment)
The color filter of the color filter of the display device of the present invention contains CI Pigment Blue 15:6 (CIPB15:6) and a zinc phthalocyanine-based green pigment as a pigment.
The zinc phthalocyanine-based green pigment refers to a pigment containing a compound having a phthalocyanine structure in which zinc is a central metal. Further, in the range in which the effect of the present invention can be exhibited in synergy with CI Pigment Blue 15:6, a pigment composed of a composite of a compound having a phthalocyanine structure having zinc as a central metal and another pigment may be used.
As the zinc phthalocyanine-based green pigment, one or more of CI Pigment Green 59 (CIPG59) and CI Pigment Green 58 (CIPG58) can be used. When a pigment having a compound having the zinc phthalocyanine structure is added, when the blue pigment dispersion composition for a color filter and the blue pigment dispersion resist composition for a color filter of a display device are formed, the composition can be improved. The brightness of the object or the brightness and transmittance when the film is formed.
In the blue pigment dispersion composition for a color filter such as a display device having a white organic EL light source, the total amount of the coloring pigment used is preferably 5 to 80 by mass based on the total solid content of the composition. %, more preferably 20 to 50% by mass.

In order to impart high definition and contrast to the blue pigment dispersion composition of the color filter of the display device of the present invention, it is preferable to use a microparticulated pigment as each of the above-described coloring pigments. By performing the microparticulation treatment, the primary particle diameter of the colored pigment can be made finer and more uniform.
As the microparticulation treatment, for example, it is preferred to carry out a microparticulation treatment comprising an untreated coloring pigment and a water-soluble inorganic salt (for sodium chloride, cesium chloride, potassium chloride or the like, preferably sodium chloride). The water-soluble inorganic salt to be used preferably has an average particle diameter of 50 μm or less and a mixture of water-soluble dispersion media (alkoxy alcohols, glycols, ethers, and the like) which does not substantially dissolve the water-soluble inorganic salt. TRI-MIX (trademark) manufactured by Inoue Seisakusho Co., Ltd., which is a planetary mixer, as described in JP-A-2006-192385, as a kneader, a roller mill, a ball mill, an attritor, a sand mill, and a sand mill. After kneading, a kneading apparatus such as miracle KCK manufactured by Asada Iron Works Co., Ltd., which is a continuous uniaxial kneader, is subjected to a salt grinding treatment for removing the water-soluble inorganic salt and the water-soluble dispersion medium.
Furthermore, from the viewpoint of suppressing the uniformity of the crystal growth of the coloring pigment, it is preferable to carry out the microparticulation treatment in the presence of a pigment dispersing aid to be described later. The amount of the pigment dispersing aid to be used at this time is 0.5 to 30 parts by mass, preferably 3 to 10 parts by mass, per 100 parts by mass of the coloring pigment.

Further, in addition to CI Pigment Blue 15:6, a known blue pigment such as CI Pigment Blue 15:3 (CIPB 15:3) or CI Pigment Blue 16 (CIPB16) can be used in combination, without departing from the effects of the present invention. Further, as the green pigment, CI Pigment Green 7 (CIPG7), CI Pigment Green 36 (CIPG36), or the like can be used, for example, within a range that does not impair the effects of the present invention and does not lower the brightness and contrast.
However, it is preferable to use a purple-based pigment.

(Pigment Dispersing Aid)
The pigment dispersing aid which is a blue pigment dispersion composition for a color filter used in the display device of the present invention is preferably a basic structure having the same or similar molecular structure as CI Pigment Blue 15:6 (ε phthalocyanine copper pigment). An acid group which increases the affinity with an organic solvent is introduced into the skeleton to prepare a pigment dispersing aid of a pigment dispersing agent having an acidic group. In the step of atomizing and dispersing the pigment, such a pigment dispersing aid has a small portion of the basic skeleton adsorbed on the surface of the pigment, and the acidic group has an affinity with the organic solvent or the pigment dispersing agent, so that the pigment is dispersed finely. The effect of improving the stability over time after dispersion and dispersion. Further, the pigment dispersing aid itself is preferably dissolved in the organic solvent or dispersed in the fine particles, and is more preferably adsorbed in a larger range on the surface of the pigment.
Among them, when a pigment dispersing aid having a sulfonic acid group as an acidic group or the like is used, good results can be obtained.
In the blue pigment dispersion composition for a color filter of the display device of the present invention, the amount of the pigment dispersing aid having an acidic group is from 0.5 to 30 parts by mass based on 100 parts by mass of the coloring pigment. When the content of the above-mentioned pigment dispersing aid having an acidic group is less than 0.5 part by mass, the pigment dispersing effect is lowered, and on the other hand, when it exceeds 30 parts by mass, the pigment dispersing effect is not further improved.

The above pigment dispersing aid having an acidic group is as follows:
(1) When a coloring pigment which is subjected to microparticulation treatment in the absence of a pigment dispersing aid having an acidic group is used, when the micronized colored pigment is dispersed, it is acidic with respect to 100 parts by mass of the colored pigment. The pigment dispersing aid of the group is 0.5 to 30 parts by mass, preferably 3 to 15 parts by mass.
(2) When the coloring pigment which is subjected to the microparticulation treatment in the presence of the pigment dispersing aid having an acidic group, the coloring pigment is used in the microparticulation treatment, and the pigment dispersing aid is used in an amount of 0.5 to 30 by mass based on 100 parts by mass of the coloring pigment. The amount of the pigmented pigment is preferably from 0 to 29.5 parts by mass, preferably from 0 to 12 parts by mass, based on 100 parts by mass of the coloring pigment.
Moreover, the amount of the pigment dispersing aid having an acidic group used in the microparticulation treatment is the same as the amount of the pigment dispersing aid having an acidic group used when the micronized colored pigment is dispersed in the pigment. The total amount of the pigment dispersing aid having an acidic group is from 0.5 to 30 parts by mass, preferably from 3 to 15 parts by mass, per 100 parts by mass of the coloring pigment. More specifically, a case where a pigment dispersing aid having a sulfonic acid group is used as a pigment dispersing aid having an acidic group will be described.
When the CI Pigment Blue 15:6 is dispersed as a blue pigment, as described above, a sulfonate of a pigment and/or a pigment having an anthracene skeleton having the same skeleton as CI Pigment Blue 15:6 as an ε-phthalocyanine copper pigment is used. As a pigment dispersing aid.

(polymer pigment dispersant)
In the blue color pigment dispersion composition for a color filter of the display device of the present invention, a polymer pigment dispersant can be formulated. As such a polymer pigment dispersant, a polymer pigment dispersant having a basic group which has been conventionally used in the field of color filters can be used.
In the blue pigment dispersion composition for a color filter of the display device of the present invention, the amount of the polymer pigment dispersant used is preferably 1 to 100 parts by mass, more preferably 1 to 60 parts by mass per 100 parts by mass of the coloring pigment. Share. When the content of the polymer pigment dispersant is less than 1 part by mass, the pigment dispersion effect may be lowered. On the other hand, when it exceeds 100 parts by mass, the developability may be lowered.

Examples of the polymer pigment dispersant having a basic group include the following.
(1) an amine group and/or an imine group of a polyamine compound (for example, poly(lower) alkylamine such as polyallylamine, polyvinylamine or polyethyleneimine) and a polysiloxane selected from the group consisting of a free carboxyl group A reaction product of at least one of the group consisting of ester, polyamine, and polyester decylamine.
(2) at least one side chain having at least one side group selected from the group consisting of a polyester side chain, a polyether side chain, and a polyacrylic acid side chain in the molecule, and a basic nitrogen group-containing carbonized secondary group Amine compounds.
(3) A reaction product of a low molecular amine compound such as a poly(lower) alkyleneimine or a methylimidopropylamine and a polyester having a free carboxyl group.
(4) The isocyanate group of the polyisocyanate compound is a polyester having one hydroxyl group such as an alcohol such as methoxypolyethylene glycol or a caprolactone polyester, and has 2 to 3 isocyanate-reactive functional groups. A reaction product obtained by reacting a compound, an aliphatic or heterocyclic hydrocarbon compound having an isocyanate-reactive functional group and a tertiary amino group.
(5) A reaction product of reacting a polymer of an acrylate having an alcoholic hydroxyl group with a polyisocyanate compound and a hydrocarbon compound having an amine group.
(6) A reaction product obtained by adding a low molecular weight amine compound to a polyether chain.
(7) A reaction product obtained by reacting a compound having an isocyanate group with a compound having an amine group.
(8) A reaction product obtained by reacting a polyepoxy compound with a linear polymer having a free carboxyl group and an organic amine compound having one secondary amino group.
(9) A reaction product of a polycarbonate compound having a functional group reactive with an amine group at one end and a polyamine compound.
(10) selected from the group consisting of methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate, stearyl methacrylate, benzyl methacrylate, methyl acrylate, ethyl acrylate, At least one of methacrylate or acrylate such as propyl acrylate, butyl acrylate, stearyl acrylate or benzyl acrylate, and acrylamide, methacrylamide, N-hydroxymethyl decylamine, ethylene At least one of a basic group-containing polymerizable monomer such as a group of imidazole, a vinyl pyridine, a monomer having an amine group and a polycaprolactone skeleton, and a styrene, a styrene derivative, or another polymerizable single At least one copolymer in the body.
(11) An acrylic block copolymer composed of a block having a basic group such as a tertiary amino group or a quaternary ammonium base and a block having no basic functional group.
(12) A pigment dispersant obtained by subjecting a polyallylamine to a polycarbonate compound by a Michael addition reaction.
(13) A carbodiimide compound having at least one polybutadiene chain and a basic nitrogen-containing group, respectively.
(14) A carbodiimide compound having at least one side chain having a guanamine group and a basic nitrogen-containing group in the molecule.
(15) A polyurethane compound having an amine group containing an ethylene oxide chain and a propylene oxide chain and having an amine group which is quaternized by a quaternizing agent.
(16) a compound obtained by reacting an isocyanate group of an isocyanate compound having an isocyanurate ring in a molecule with an active hydrogen group of a compound having an active hydrogen group in the molecule and having a carbazole ring and/or an azobenzene skeleton And a total amount of a urethane bond derived from an isocyanate compound having an isocyanurate ring in the molecule and a urethane bond and a urea bond formed by reacting an isocyanate group with an active hydrogen group, carbazole The number of ring and azobenzene skeletons is from 15 to 85%.

(resin)
As a resin for a blue pigment dispersion composition for a color filter such as a display device having a white organic EL light source of the present invention, a transmittance of 80% or more in a total wavelength region of 400 to 700 nm in a visible light region can be used. Preferably, 95% or more of the resin is used. As such a resin, a thermosetting resin, a thermoplastic resin, or an alkali-soluble resin can be used.
The total solid content of the blue pigment dispersion composition for a color filter for a color filter such as a display device having a white organic EL light source is preferably 5 to 94% by mass based on the total mass of the resin used in the mass fraction. More preferably, it is the range of 20-50 mass %.
Examples of the thermosetting resin and the thermoplastic resin include butyral resin, styrene-maleic acid copolymer, chlorinated polyethylene, chlorinated polypropylene, polyvinyl chloride, vinyl chloride-vinyl acetate copolymer, and polyacetic acid. Vinyl ester, polyurethane resin, phenolic resin, polyester resin, acrylic resin, alkyd resin, styrene resin, polyamide resin, rubber resin, cyclized rubber, epoxy resin, cellulose , polybutadiene, polyimine resin, benzoguanamine resin, melamine resin, urea resin, and the like.
In addition, in the case of the blue color pigment dispersion resist composition of the color filter of the display device, a photopolymerizable resin to be described later may be blended.

(as an alkali-soluble resin of resin)
The alkali-soluble resin can be blended in the blue pigment dispersion composition of the color filter of the display device of the present invention. As such a resin, if the pigment is used as a binder and the color filter is produced, it is particularly preferable that the developer used in the development processing step has a developer solution which is soluble in the alkali developer. For the limitation, the developer used in the past can be used. Among them, an alkali-soluble resin having a carboxyl group is preferred, and a copolymer of an ethylenically unsaturated monomer having one or more carboxyl groups and another copolymerizable ethylenically unsaturated monomer is particularly preferred.
Specific examples thereof include an ethylenically unsaturated monomer having a carboxyl group such as acrylic acid or methacrylic acid, and styrene, 2-hydroxyethyl acrylate, and methyl group copolymerizable from an ethylenically unsaturated monomer having a carboxyl group. 2-hydroxyethyl acrylate, allyl acrylate, allyl methacrylate, benzyl acrylate, benzyl methacrylate, cyclohexyl acrylate, cyclohexyl methacrylate, glyceryl monoacrylate, methacrylic acid Monomers and oligomers of glycerides, N-phenylmaleimide, polystyrene macromonomers, polymethyl methacrylate macromonomers, carbonium epoxide diacrylates, etc. A copolymer of at least one ethylenically unsaturated monomer in the group consisting of.

The acid value of the alkali-soluble resin in the present invention is preferably from 50 to 300 mgKOH/g from the viewpoint of development characteristics. Further, in the present invention, the acid value is a theoretical acid value, and is a value which is arithmetically determined based on the ethylenically unsaturated monomer having a carboxyl group and its content.
Further, the weight-average molecular weight of the alkali-soluble resin in the present invention is preferably from 1,000 to 100,000 in view of development characteristics and solubility in an organic solvent. Further, in the present invention, the weight average molecular weight of the alkali-soluble resin is a polystyrene-equivalent weight average molecular weight obtained by GPC. In the present invention, Waters 2690 (manufactured by Waters Corporation) was used as a device, and PLgel 5 μ MIXED-D (manufactured by Polymer Laboratories Co., Ltd.) was used as a column.
The amount of the alkali-soluble resin used in the present invention is from 1 to 300 parts by mass, preferably from 10 to 200 parts by mass, per 100 parts by mass of the color pigment used. In this case, when the amount of the alkali-soluble resin used is less than 1 part by mass, the development characteristics may be lowered. On the other hand, when it exceeds 300 parts by mass, since the concentration of the colorant is relatively lowered, it is difficult to achieve the target color density as a film.

(Barium sulfate)
In order to improve the heat resistance (brightness) of the blue pigment dispersion composition for a color filter of the present invention, barium sulfate having a primary particle diameter of 5 to 20 nm can be used.
The amount of use of barium sulfate is used in the range of 0 to 25 parts by mass, preferably 5 to 20 parts by mass, per 100 parts by mass of the coloring pigment.
The above-mentioned barium sulfate is used at the time of dispersion or dispersion of the micronized colored pigment.

(Organic solvents)
As the organic solvent used for the blue pigment dispersion composition for a color filter of the display device of the present invention, an organic solvent conventionally used in the field of liquid crystal color filter resists can be suitably used. Specifically, it is an ester organic solvent having a boiling point of 100 to 220 ° C at normal pressure (1.013 × 10 ² kPa), an ether organic solvent, an ether ester organic solvent, a ketone organic solvent, or an aromatic hydrocarbon organic solvent. A solvent, a nitrogen-containing organic solvent, or the like. When a large amount of an organic solvent having a boiling point of more than 220 ° C is contained, when the color filter is coated with a blue pigment dispersion composition or a coating film containing the composition, the organic solvent is not sufficiently evaporated. However, it remains in the dry coating film, and there is a possibility that the heat resistance of the dried coating film is lowered. Further, when a large amount of an organic solvent having a boiling point of less than 100 ° C is contained, it is difficult to apply it without mottle and uniformity, and there is a possibility that a coating film having excellent surface smoothness cannot be obtained.

As the organic solvent used for the blue pigment dispersion composition for a color filter of the present invention, specifically, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monoisopropyl group can be exemplified. Ether, ethylene glycol monobutyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol monobutyl ether, diethylene glycol An ether organic solvent such as diethyl ether, diethylene glycol dimethyl ether or diethylene glycol methyl ethyl ether; ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate Ether ester organic solvent such as ester, ethylene glycol monobutyl ether acetate, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate; methyl isobutyl ketone, cyclohexanone, 2 a ketone organic solvent such as heptanone or δ-butyrolactone; methyl 2-hydroxypropionate, ethyl 2-hydroxypropionate, ethyl 2-hydroxy-2-methylpropionate, 3-methyl- 3-methoxybutylpropionate, methyl 3-methoxypropionate, ethyl 3-methoxypropionate, methyl 3-ethoxypropionate, ethyl 3-ethoxypropionate Ethyl ethoxyacetate, ethyl hydroxyacetate, n-amyl formate Ester organic solvent; alcohol solvent such as methanol, ethanol, isopropanol or butanol; N-methylpyrrolidone, N,N-dimethylformamide, N,N-dimethylacetamide, etc. Nitrogen-containing organic solvents and the like. These may be used alone or in combination of two or more.
Among these organic solvents, diethylene glycol dimethyl ether, diethylene glycol methyl ethyl ether, ethylene glycol monomethyl ether acetate, and the like are preferable in terms of solubility, dispersibility, coatability, and the like. Propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, cyclohexanone, 2-heptanone, ethyl 2-hydroxypropionate, 3-methyl-3-methoxybutyl propionate Ethyl 3-methoxypropionate, methyl 3-ethoxypropionate, n-pentyl formate, etc., more preferably propylene glycol monomethyl ether acetate.

The blue pigment dispersion composition for a color filter of the display device of the present invention mainly comprises a coloring pigment, a pigment dispersing aid, a resin, and an organic solvent, and these components are totaled in a blue pigment dispersion composition for a color filter of a display device. It accounts for 90 to 100% by mass. Further, a polymer pigment dispersant may be further added, and as such a polymer pigment dispersant, any of the above may be employed.
In addition, the color filter of the color filter of the display device of the present invention may be used as a resist composition in a state in which the blue pigment dispersion composition is not photocurable.

(Additives that can be added as needed)
Various additives such as a photopolymerization initiator, a thermal polymerization inhibitor, an ultraviolet absorber, and an antioxidant can be suitably used in accordance with the method for producing a blue pigment dispersion composition for a color filter of a display device. The photopolymerization initiator is exemplified by the following.

(Method for Producing Blue Pigment Dispersion Composition for Color Filter of Display Device of the Present Invention)
A method of producing a blue color pigment dispersion composition for a color filter using the above raw materials to produce a display device will be described. Further, in the case where the color filter of the color filter which is not a photocurable display device is a blue pigment-dispersed resist composition, it is not necessary to mix a photopolymerizable compound.
Therefore, a pigment dispersion composition containing CI Pigment Blue 15:6 and a zinc phthalocyanine-based green pigment dispersion composition were first prepared as follows.

The pigment dispersion composition containing CI Pigment Blue 15:6 is obtained from a pigment dispersion aid having an acidic group (preferably a sulfonate of a pigment and/or a pigment having an anthracene skeleton having the same skeleton as CI Pigment Blue 15:6). A mixture of CI Pigment Blue 15:6 which is micronized in the presence or absence of a resin, a resin, a polymer pigment dispersant as needed, an organic solvent, barium sulfate as needed, and further additives as needed. The obtained mixture is kneaded and dispersed by various dispersing machines such as a roll mill, a kneader, a high-speed stirring device, a bead mill, a ball mill, a sand mill, an ultrasonic disperser, and a high-pressure disperser to obtain CI-containing Pigment blue 15:6 pigment dispersion composition.

The zinc phthalocyanine-based green pigment dispersion composition is obtained by micronization in the presence or absence of a pigment dispersing aid having an acidic group (preferably a sulfonate of a pigment having the same skeleton as the zinc phthalocyanine-based green pigment). a zinc phthalocyanine-based green pigment to be treated, a pigment dispersing aid (preferably a sulfonate of a pigment having the same skeleton as the zinc phthalocyanine-based green pigment), a resin, a polymer pigment dispersant as needed, an organic solvent, barium sulfate, Further a mixture of other additives as needed. The obtained mixture is kneaded and dispersed by various dispersing machines such as a roll mill, a kneader, a high-speed stirring device, a bead mill, a ball mill, a sand mill, an ultrasonic disperser, and a high-pressure disperser to obtain a phthalocyanine. A zinc-based green pigment dispersion composition.

The pigment dispersion composition containing CI Pigment Blue 15:6 obtained as described above and the zinc phthalocyanine-based green pigment dispersion composition can be obtained, for example, by the following production methods (1) and (2). The color filter of the display device of the EL light source disperses the composition with a blue pigment.
In this case, the pigment-dispersed composition containing the complementary color pigment described below may be used in combination as needed. Pigment-dispersed composition containing a complementary color pigment: a complementary color pigment may be used as needed. A complementary color pigment which is micronized in the presence or absence of a pigment dispersing aid having an acidic group, and thus the above-mentioned CI-containing pigment blue 15: The pigment dispersion composition of 6 was similarly obtained as a pigment dispersion composition.

(1) a step of mixing a pigment dispersion composition containing CI Pigment Blue 15:6 and a zinc phthalocyanine-based green pigment dispersion composition in such a manner as to obtain a predetermined ratio of the complementary color pigment, and then adding a resin as needed A barium sulfate, an organic solvent, and other additives are used to produce a blue pigment dispersion composition for a color filter of a display device having a white organic EL light source of the present invention.
(2) a step of mixing a complementary color pigment in a pigment dispersion composition containing CI Pigment Blue 15:6 produced as described above to a predetermined ratio, and then adding a resin, barium sulfate, an organic solvent, or the like as needed Other additives to produce a blue pigment-dispersed composition for a color filter containing CI Pigment Blue 15:6, and on the other hand, a zinc phthalocyanine-containing composition is also produced for a zinc phthalocyanine-based green pigment dispersion composition. The color filter of the green pigment-like color is prepared by dispersing the composition with a blue pigment and mixing them to produce a blue pigment dispersion composition for a color filter of the present invention.

A color filter is prepared by adding a resin, a barium sulfate, an organic solvent, and other additives to the pigment dispersion composition containing the CI Pigment Blue 15:6 obtained by the above method and the zinc phthalocyanine green pigment dispersion composition as needed. The composition was dispersed with a blue pigment.
Next, in the prepared color filter blue pigment dispersion composition, the complementary color pigment is mixed with the CI pigment blue 15:6 and the zinc phthalocyanine-based green pigment to have a predetermined ratio, thereby obtaining the white organic of the present invention. The color filter of the display device of the EL light source disperses the composition with a blue pigment.

In the production method of the above (1) and (2), when the microparticulated pigment which is subjected to the microparticulation treatment in the presence of the pigment dispersing aid having an acidic group is used, the micronized pigment does not have an acidity even when dispersed. A pigment dispersing aid of the group can also be produced.
Further, in the production methods of the above (1) and (2), the resin or barium sulfate may be added after the preparation of the pigment dispersion composition and/or after the preparation of the pigment dispersion composition.
Further, in the production methods of the above (1) and (2), it is preferred to use a microparticulated pigment in the presence of a pigment dispersing aid having an acidic group from the viewpoint of obtaining high coloring power and high brightness. .

At present, a method of producing a color filter by using a blue pigment-dispersed resist composition for a color filter is mainly a photoresist method using a photocurable composition, and is hereinafter classified into a photoresist. The color filter used in the method is a photocurable blue pigment dispersion composition and a blue pigment dispersion composition for a non-photocurable color filter different from the above, and the components and the like contained in the color filter are described below. .

The total solid content of the blue pigment dispersion composition for a color filter such as a display device having a white organic EL light source is preferably 5 to 94% by mass, more preferably 20%, based on the total mass of the resin used in the mass fraction. A range of 50% by mass.

[B. Case where the color filter of the display device is photocurable with the blue pigment dispersion resist composition]
Next, a case where the blue color pigment dispersion resist composition of the color filter of the display device of the present invention is photocurable will be described.
When the blue pigment dispersion resist composition for a color filter of the display device of the present invention is photocurable, the composition has active energy ray curability and is a resist composition capable of alkali development, and mainly contains a pigment. The pigment dispersing aid, the resin, and the organic solvent include barium sulfate and a photopolymerizable compound as the resin, and may further contain an alkali-soluble resin.
The type and amount of the pigment, the pigment dispersing aid, the polymer pigment dispersing agent, the resin other than the photopolymerizable compound, the barium sulfate, and the organic solvent are used in accordance with the description of the blue pigment dispersion composition for the color filter. .

In view of the solubility of the alkali-soluble resin, the dispersibility of the coloring pigment, and the coating property, the organic solvent is preferably used in the blue pigment dispersion resist composition for a color filter of the display device of the present invention. It is contained in an amount of 50% by mass or more, and more preferably 70% by mass or more.

(photopolymerizable compound)
As the photopolymerizable compound used for the blue pigment-dispersed resist composition for a color filter of the display device of the present invention, a monomer or oligomer having one or more photopolymerizable unsaturated bonds in the molecule can be used. The photopolymerizable resin is the same photopolymerizable compound as described in the above-described color filter dispersion composition for a color filter. The monomer, the oligomer, and the like having a photopolymerizable unsaturated bond are those capable of being decomposed by an active energy ray such as ultraviolet rays or electron beams, which are described later, by a photopolymerization initiator. A monomer or oligomer having an unsaturated bond polymerized and resinized.
Examples of the photopolymerizable compound include, as a monomer having one photopolymerizable unsaturated bond in the molecule, methyl methacrylate, butyl methacrylate, 2-ethylhexyl methacrylate, and methyl acrylate. An alkyl methacrylate or acrylate such as butyl acrylate or 2-ethylhexyl acrylate; an aryl methacrylate or acrylate of benzyl methacrylate or benzyl acrylate; Alkoxyalkyl methacrylate or acrylate of ethyl ethyl acrylate, butoxyethyl acrylate, etc.; N,N-dimethylaminoethyl methacrylate, N-N-dimethylamine acrylate Aminoalkyl methacrylate or acrylate such as ethyl ester; polyalkylene glycol alkyl ether of diethylene glycol ethyl ether, triethylene glycol butyl ether, dipropylene glycol methyl ether, etc. a methacrylate or acrylate of a polyalkylene glycol aryl ether such as hexaethylene glycol phenyl ether; isobornyl methacrylate or acrylate; glyceryl methacrylate or Acrylate; 2-hydroxyethyl methacrylate or acrylate.
Examples of the monomer having two or more photopolymerizable unsaturated bonds in the molecule of the photopolymerizable compound include bisphenol A dimethacrylate, 1,4-butanediol dimethacrylate, and 1,3-. Butanediol dimethacrylate, diethylene glycol dimethacrylate, glyceryl dimethacrylate, neopentyl glycol dimethacrylate, polyethylene glycol dimethacrylate, polypropylene glycol II Methacrylate, tetraethylene glycol dimethacrylate, trimethylolpropane trimethacrylate, pentaerythritol trimethacrylate, pentaerythritol tetramethacrylate, dipentaerythritol tetramethacrylate, dipentaerythritol Hexamethyl acrylate, dipentaerythritol pentamethyl acrylate, bisphenol A diacrylate, 1,4-butanediol diacrylate, 1,3-butylene glycol diacrylate, diethylene glycol diacrylate , glyceryl diacrylate, neopentyl glycol diacrylate, polyethylene glycol diacrylate, polypropylene glycol diacrylate, tetraethylene glycol diacrylate, trimethylolpropane triacrylate, pentaerythritol triacrylate Pentaerythritol tetrapropene An acid ester, dipentaerythritol tetraacrylate, dipentaerythritol hexaacrylate, dipentaerythritol pentaacrylate, or the like. These monomers may be used alone or in combination of two or more.
Further, an oligomer obtained by polymerizing a photopolymerizable compound can be used.
As the photopolymerizable resin of the photopolymerizable compound, (meth)acrylic acid can be introduced via a isocyanate group, an aldehyde group, an epoxy group or the like on a linear polymer having a reactive substituent such as a hydroxyl group, a carboxyl group or an amine group. A resin of a photocrosslinkable group such as a compound or cinnamic acid. Further, a linear polymer containing an acid anhydride such as a styrene-maleic anhydride copolymer or an α-olefin-maleic anhydride copolymer can be used as a (meth)acrylic compound having a hydroxyl group such as a hydroxyalkyl (meth)acrylate. A semi-esterified polymer is carried out.
The photopolymerizable compound which can form the above-mentioned resin can be used individually or in combination of 2 or more types. In the present invention, the amount of the photopolymerizable compound used is preferably in the range of 3 to 50% by mass based on the total solid content in the blue pigment-dispersed resist composition for the color filter of the display device. .

(photopolymerization initiator)
The photopolymerization initiator used in the blue pigment dispersion resist composition for a color filter of the display device of the present invention can generate radicals and cations by irradiating an active energy ray such as ultraviolet rays or electron beams. It is not particularly limited, and examples thereof include benzophenone, N,N'-tetraethyl-4,4'-diaminobenzophenone, and 4-methoxy-4'-dimethylaminodiphenyl. Ketone, benzoin, 2,2-diethoxyacetophenone, benzoin, benzoin methyl ether, benzoin isobutyl ether, benzyl dimethyl ketal, α-hydroxyisobutyl benzophenone, thiophene Tons of ketone, 2-chlorothioxanthone, 1-hydroxycyclohexyl benzophenone, tert-butyl hydrazine, 1-chloroindole, 2,3-dichloropurine, 3-chloro-2-methylindole, 2-ethylhydrazine, 1,4-naphthoquinone, 1,2-benzopyrene, 1,4-dimethylhydrazine, 2-phenylindole, 2-methyl-1[4-( Methylthio)phenyl]-2-morpholinylpropan-1-one, a triazine-based photopolymerization initiator, and the like. These photopolymerization initiators may be used alone or in combination of two or more.
In the present invention, the content of the photopolymerization initiator is preferably from 1 to 20% by mass based on the total solid content of the blue pigment-dispersed resist composition for the color filter of the display device. The scope.

The blue pigment dispersion resist composition for a color filter of the display device of the present invention mainly comprises a coloring pigment, a pigment dispersing aid, a polymer pigment dispersing agent, an alkali-soluble resin, a photopolymerizable compound, a photopolymerization initiator, The barium sulfate and the organic solvent account for 90 to 100% by mass of the total of the above components in the blue pigment dispersion resist composition for a color filter.

(Additives that can be added as needed)
When the blue pigment dispersion resist composition for a color filter of the display device of the present invention is photocurable, various additives such as a thermal polymerization inhibitor, an ultraviolet absorber, and an antioxidant can be appropriately used as needed.

[C. Case where the color filter of the color filter of the display device is non-photocurable by the blue pigment dispersion resist composition]
When the blue color pigment dispersion resist composition of the display device is non-photocurable, the blue pigment dispersion resist composition for color filters not containing the above B. display device is photocurable. The photopolymerizable compound and the photopolymerization initiator used in the above-mentioned display device can be further blended with a resin other than the photopolymerizable compound shown in the description of the composition of the blue pigment dispersion composition for a color filter of the display device.

(Additives that can be added as needed)
When the blue pigment dispersion resist composition for a color filter of the display device of the present invention is non-photocurable, various additives such as an ultraviolet absorber and an antioxidant may be appropriately used as needed.

(Method for Producing Blue Pigment Dispersed Resist Composition for Color Filter of Display Device of the Present Invention)
A method of dispersing a resist composition with a blue pigment for a color filter using the above materials for producing a display device will be described. When the blue color pigment dispersion resist composition of the display device is photopolymerizable, the blue color pigment dispersion composition is added to the color filter of the display device obtained above, and a photopolymerizable compound and light are further added. A polymerization initiator, a base-soluble resin, a barium sulfate, an organic solvent, and other additives are used to obtain a blue pigment-dispersed resist composition for a color filter of the display device of the present invention.
Further, when it is non-photopolymerizable, any one of an alkali-soluble resin, barium sulfate, an organic solvent, and other additives may be further added to obtain a color filter for a color filter of the present invention. Things. The same applies to the production method described below.
Specifically, it can be obtained, for example, by the following production methods (1) and (2).

(1) The pigment dispersion composition containing CI Pigment Blue 15:6 and zinc phthalocyanine are previously prepared in such a manner that CI Pigment Blue 15:6, zinc phthalocyanine-based green pigment, and a complementary color pigment as needed are in a predetermined ratio. A color filter for a color filter of a display device obtained by mixing a green pigment dispersion composition or the like is added to a blue pigment dispersion composition, and a photopolymerizable compound, a photopolymerization initiator, an alkali-soluble resin, barium sulfate, and an organic solvent are further added as needed. And other additives, etc., thereby obtaining a blue pigment dispersion resist composition for a color filter of the display device of the present invention.

(2) In the above pigment-dispersed composition containing CI Pigment Blue 15:6 and the zinc phthalocyanine-based green pigment dispersion composition, a polymerizable compound, a photopolymerization initiator, an alkali-soluble resin, barium sulfate, and the like are respectively added as needed. An organic solvent and other additives are used to obtain a blue pigment-dispersed resist composition for a color filter of a display device.
Thereafter, a step of mixing the color filter of the display device with the blue pigment-dispersed resist composition is carried out to produce a blue pigment-dispersed resist composition for a color filter of the display device of the present invention.
In the blue pigment-dispersed resist composition for a color filter of a display device obtained by the method of the above (1) and (2), a photopolymerizable compound or a photopolymerization initiator is further added as needed. A pigment-dispersed resist composition for each color filter is prepared according to a desired alkali-soluble resin, barium sulfate, an organic solvent, and other additives. Next, the pigment dispersion resist composition for each of the prepared color filters is mixed so that CI Pigment Blue 15:6, zinc phthalocyanine-based green pigment, and a complementary color pigment as needed become a predetermined ratio, thereby obtaining the present invention. The color filter of the display device disperses the resist composition with a blue pigment.
In addition, as a method of producing a color filter of a display device using a blue pigment dispersion composition for a color filter using the display device of the present invention, a device including the same may be employed as a composition other than the pigment dispersion composition. A well-known method of manufacturing.
For the blue pigment dispersion composition for a color filter having a specific composition of the present invention, as its color characteristic (x, y, Y), the chromaticity x is preferably 0.125 to 0.135. Preferably, y is from 0.040 to 0.121, particularly preferably from 0.044 to 0.100.
[Examples]

The invention is further illustrated by the following examples, but the invention is not limited to the examples. Further, "%" means "% by mass" and "parts" means "parts by mass" unless otherwise stated.

<Pigment Dispersing Aid>
Phthalocyanine derivative: DISPER BYK-2100 (made by BYK Chemical Co., Ltd.)
<Pigment Dispersant>
LP21116: acrylic polymer, acrylic polymer, amine value 29, solid content 40% by mass
<alkali soluble resin>
ZAH110: manufactured by Amika Chemical Co., Ltd., acid value: 100 mgKOH/g, weight average molecular weight: about 15,000, solid content of 35 mass%
<Photopolymerizable compound>
DPHA: dipentaerythritol hexaacrylate <organic solvent>
PGMEA: propylene glycol monomethyl ether acetate
PGME: propylene glycol monomethyl ether

A blue pigment dispersion composition for a color filter was obtained based on the formulation shown in Table 1 below.

[Table 1]

<Color filter dispersion resist composition with blue pigment>
The components of the above examples and comparative examples were mixed to have the composition shown in Table 1, and the zirconia beads of 0.2 mmφ were kneaded with a paint conditioner for 6 hours to obtain a blue color filter. The color pigment dispersion composition.

[Table 2]

Then, the color filter of the color filter described in Table 1 was uniformly mixed with other materials using a high-speed mixer to obtain the composition of Table 2, and then filtered by a membrane filter having a pore size of 3 μm to obtain color. The filter disperses the resist composition with a blue pigment.

(Evaluation)
<Production of sample>
The color filter of the examples and the comparative examples was coated on a glass substrate with a blue pigment dispersion resist composition using a homogenizer. Subsequently, it was prebaked at 100 ° C for 3 minutes, exposed to a high pressure mercury lamp, and further baked at 230 ° C for 30 minutes.

<Color characteristics and contrast>
In the samples of the examples and the comparative examples, the color characteristics (x, y, Y) of the respective resists were measured by a spectrophotometer (manufactured by Shimadzu Corporation, UV-2500PC, C-light source 2° field of view). The luminances Y and contrasts at chromaticity x=0.1332, y=0.120, x=0.1330, y=0.090, and x=0.1337, y=0.090, respectively, were obtained.

<film thickness>
With respect to the film thickness, the coating film was cut by a cutter to a thickness of about 5 mm, and the film thickness was measured by a film thickness meter (manufactured by KLA-Tencor Corporation, surface profiler Alpha-Step IQ).

<viscosity>
The viscosity at 25 ° C was measured using an E-type viscometer (manufactured by Toki Sangyo Co., Ltd., R100 type viscometer model RE100L).

<Dispersion stability>
The blue pigment-dispersed resist composition for color filters used in the resist methods of the above examples and comparative examples was collected in a glass bottle and sealed, and 40 ° C, 5 ° C, and room temperature were used. The state after storage for 1 month at each temperature of (23 degreeC) was evaluated by the following evaluation criteria.
○: The viscosity change rate before and after storage is 10% or less ×: The viscosity change rate before and after storage exceeds 10%

According to the above examples and comparative examples in which the resist composition was dispersed with a blue pigment for color filters, the dispersion stability was good. Moreover, according to the embodiment, higher brightness and contrast than the comparative example can be obtained.
Further, although the components other than the pigments of the examples and the comparative examples were the same as the compounding amount, the viscosity of the composition of the example was lower.

no

Claims (8)

A color filter for a color filter of a display device, which is a blue pigment dispersion composition for a color filter mainly comprising a coloring pigment, a pigment dispersing aid, a resin, and an organic solvent, the coloring pigment comprising CI Pigment Blue 15:6 with zinc phthalocyanine green pigment. The blue color pigment dispersion composition for a color filter of the display device according to the first aspect of the invention, wherein the resin comprises an alkali-soluble resin and a photopolymerizable compound. A blue pigment dispersion composition for a color filter of a display device according to claim 1 or 2, wherein a mass ratio of the CI Pigment Blue 15:6 to the zinc phthalocyanine-based green pigment It is 99.9: 0.1~90.0:10.0. A blue pigment dispersion composition for a color filter of a display device according to any one of claims 1 to 3, wherein the zinc phthalocyanine-based green pigment is CI Pigment Green 59 and CI Pigment Green 58 One or more of them. A blue pigment-dispersed resist composition for a color filter of a display device, which is a color filter blue for a display device mainly comprising a coloring pigment, a pigment dispersing aid, a resin, a photopolymerizable compound, and an organic solvent. A color pigment dispersion resist composition comprising CI Pigment Blue 15:6 and a zinc phthalocyanine-based green pigment. A blue pigment dispersion resist composition for a color filter of a display device according to claim 5, wherein the resin contains an alkali-soluble resin and a photopolymerizable compound. A blue pigment-dispersed resist composition for a color filter of a display device according to claim 5 or 6, wherein the CI Pigment Blue 15:6 and the zinc phthalocyanine-based green pigment The mass ratio is 99.9: 0.1~90.0:10.0. A blue pigment dispersion resist composition for a color filter of a display device according to any one of claims 5 to 7, wherein the zinc phthalocyanine green pigment is CI Pigment Green 59 and CI One or more of the pigment greens 58.