TWI871520B - Pigment dispersion, photosensitive resin composition comprising the same, photosensitive resin layer, color filter, and display device - Google Patents

Abstract

Disclosed are a pigment dispersion, a photosensitive resin composition including the pigment dispersion, a photosensitive resin layer manufactured using the photosensitive resin composition, a color filter including the photosensitive resin layer, and a display device including the color filter. The pigment dispersion includes a green pigment dispersion including a first dispersion resin having a weight average molecular weight of 8000 g/mol to 12000 g/mol and an acid value of 100 mgKOH/g to 140 mgKOH/g and a yellow pigment dispersion including a second dispersion resin having a weight average molecular weight of 8000 g/mol to 12000 g/mol and an acid value of less than 100 mgKOH/g.

Description

Pigment dispersion, photosensitive resin composition including the same, photosensitive resin layer, color filter and display device

[ Cross-references to related applications ]

This application claims priority to and the benefits of Korean Patent Application No. 10-2021-0094193 filed on July 19, 2021, in the Korean Intellectual Property Office, the entire contents of which are incorporated herein by reference.

The present invention relates to a pigment dispersion, a photosensitive resin composition containing the pigment dispersion, a photosensitive resin layer made using the photosensitive resin composition, a color filter containing the photosensitive resin layer, and a display device containing the color filter.

Currently, the flat panel display market has grown too large to support the demand for plasma display panels (PDP), liquid crystal displays (LCD), organic light emitting displays (OLED), solid-state imaging devices (CCD, CMOS, etc.), touch displays using them, and the like. Specifically, LCD is the main product in the flat panel display market and is composed of color filters, thin film transistors, and liquid crystals. A color filter for a color liquid crystal display (LCD), an imaging device, or the like is manufactured by uniformly coating a photosensitive resin composition containing pigments corresponding to each of red, green, and blue colors on a substrate patterned with a black matrix, and then repeatedly heating and drying the coating film, exposing and developing it, and further heating and curing it for each color as necessary to form a picture element of each color.

Photosensitive resin compositions are basic materials for flat panel display panels, such as color filters, liquid crystal displays (LCDs), organic light emitting displays (OLEDs), plasma display panels (PDPs), solid-state imaging devices (CCDs, CMOSs, etc.), and the like, wherein the quality of the color filters varies depending on the composition of the photosensitive resin composition. Conventionally, research on photosensitive resin compositions has been conducted toward improving colorants (such as binder resins, pigments, and the like), photopolymerizable monomers, and the like, but has recently reached a limit. Therefore, efforts to improve the properties of photosensitive resin compositions by improving other components constituting the photosensitive resin composition (such as a dispersion resin for dispersing a pigment, etc.) are continuously being conducted.

The embodiment provides a pigment dispersion having excellent patternability.

Another embodiment provides a photosensitive resin composition that includes a pigment dispersion and can reproduce high color in addition to patternability.

Another embodiment provides a photosensitive resin layer made using the photosensitive resin composition.

Another embodiment provides a color filter including a photosensitive resin layer.

Another embodiment provides a display device including a color filter.

One embodiment provides a pigment dispersion: the pigment dispersion comprises a green pigment dispersion, comprising a first dispersing resin having a weight average molecular weight of 8000 g/mol to 12000 g/mol and an acid value of 100 mg potassium hydroxide/g to 140 mg potassium hydroxide/g, and a green pigment; and a yellow pigment dispersion, comprising a second dispersing resin having a weight average molecular weight of 8000 g/mol to 12000 g/mol and an acid value of less than 100 mg potassium hydroxide/g, and a yellow pigment.

The first dispersed resin and the second dispersed resin may each independently be an acrylic resin.

The weight ratio of the green pigment dispersion to the yellow pigment dispersion may be 1.41:1 to 2.46:1.

The pigment dispersion may further contain a dispersant and a solvent.

Another embodiment provides a photosensitive resin composition comprising a pigment dispersion.

The pigment dispersion may be included in an amount of 50 wt % to 90 wt % based on the total amount of the photosensitive resin composition.

The photosensitive resin composition may further include a binder resin, a photopolymerizable monomer, a photopolymerization initiator and a solvent.

Based on the total amount of the photosensitive resin composition, the photosensitive resin composition may include 0.1 wt % to 5 wt % of a binder resin; 0.5 wt % to 10 wt % of a photopolymerizable monomer; 0.01 wt % to 5 wt % of a photopolymerization initiator; 50 wt % to 90 wt % of a pigment dispersion, and the remainder of a solvent.

The photosensitive resin composition may further include malonic acid, 3-amino-1,2-propanediol, a silane coupling agent, a leveling agent, a fluorine-based surfactant, a free radical polymerization initiator, or a combination thereof.

Another embodiment provides a photosensitive resin layer made using the photosensitive resin composition.

Another embodiment provides a color filter including a photosensitive resin layer.

Another embodiment provides a display device including a color filter.

Other embodiments of the present invention are included in the following detailed description.

The pigment dispersion according to the embodiment has excellent patternability because it contains a dispersion resin optimized for a solid pigment having a specific color, and even if the photosensitive resin composition contains a high content of the pigment dispersion, high color reproduction is possible while maintaining patternability.

Hereinafter, embodiments of the present invention are described in detail. However, these embodiments are exemplary, and the present invention is not limited thereto and the present invention is defined by the scope of the patent application.

As used herein, when a specific definition is not otherwise provided, the term “alkyl” refers to a C1 to C20 alkyl group, the term “alkenyl” refers to a C2 to C20 alkenyl group, the term “cycloalkenyl” refers to a C3 to C20 cycloalkenyl group, the term “heterocycloalkenyl” refers to a C3 to C20 heterocycloalkenyl group, “aryl” refers to a C6 to C20 aryl group, the term “arylalkyl” refers to a C6 to C20 arylalkyl group, the term “alkylene” refers to a C1 to C20 alkylene group, the term “arylene” refers to a C6 to C20 arylene group, “alkylarylene” refers to a C6 to C20 alkylarylene group, the term “heteroarylene” refers to a C3 to C20 heteroarylene group, and the term “alkoxylene” refers to a C1 to C20 alkoxylene group.

As used herein, when a specific definition is not otherwise provided, "substituted" refers to at least one hydrogen halogen atom (F, Cl, Br or I), a hydroxyl group, a C1 to C20 alkoxy group, a nitro group, a cyano group, an amino group, an imino group, an azido group, a formamido group, a hydrazine group, a hydrazone group, a carbonyl group, a carbamyl group, a thiol group, an ester group, an ether group, a carboxyl group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphine group or a thiol group, an ester group, an ether group, a carboxyl group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphine group or a thiol group, a thiol ... The present invention may be replaced by a C1 to C20 alkyl group, a C2 to C20 alkenyl group, a C2 to C20 alkynyl group, a C6 to C20 aryl group, a C3 to C20 cycloalkyl group, a C3 to C20 cycloalkenyl group, a C3 to C20 cycloalkynyl group, a C2 to C20 heterocycloalkyl group, a C2 to C20 heterocycloalkenyl group, a C2 to C20 heterocycloalkynyl group, a C3 to C20 heteroaryl group, or a combination thereof.

As used herein, when a specific definition is not otherwise provided, "hetero" refers to a heteroatom containing at least one of N, O, S and P in a chemical formula.

As used herein, when a specific definition is not otherwise provided, “(meth)acrylate” refers to both “acrylate” and “methacrylate”, and “(meth)acrylic acid” refers to both “acrylic acid” and “methacrylic acid”.

As used herein, when a specific definition is not otherwise provided, the term "combination" means mixing or copolymerization.

In the present specification, when a specific definition is not otherwise provided, the unsaturated bond includes a bond between other atoms, such as a carbonyl bond or an azo bond, and a multiple bond between carbon-carbon atoms.

Furthermore, in the present specification, when no definition is otherwise provided, "*" refers to a bonding point with the same atom or chemical formula or with different atoms or chemical formulas.

The pigment dispersion according to the embodiment comprises a green pigment dispersion and a yellow pigment dispersion, wherein the green pigment dispersion comprises a first dispersing resin having a weight average molecular weight of 8000 g/mol to 12000 g/mol and an acid value of 100 mg potassium hydroxide/g to 140 mg potassium hydroxide/g and a green pigment, and the yellow pigment dispersion comprises a second dispersing resin having a weight average molecular weight of 8000 g/mol to 12000 g/mol and an acid value of less than 100 mg potassium hydroxide/g and a yellow pigment.

Conventional photosensitive resin compositions for making photosensitive resin layers in color filters are prepared by modifying binder resins, solid pigments, or the like to ensure excellent patternability, and the like. However, modifying binder resins, solid pigments, and the like alone has a fundamental limitation in improving patternability.

Specifically, since color filters can be thinned to reduce crosstalk (mixing of light) but need to maintain spectral shape, while thinning, the solid content of the pigment concentration needs to be significantly increased. Therefore, the photosensitive resin composition contains the components required for photolithography in relatively small amounts and may have difficulty in pattern formation.

The present inventors have accurately identified that difficulties in pattern formation are caused by the reduced content of components required for photolithography, and have therefore attempted to ensure the content of components required for photolithography by ensuring the necessary properties of the dispersing resin in the pigment dispersion in addition to the method of modifying the binder resin or the solid pigment including the photosensitive resin composition to improve patternability, and as a result have confirmed that patternability can be improved by limiting the weight average molecular weight and acid value of the dispersing resin of each pigment dispersion in the mixed pigment dispersion including the green pigment dispersion and the yellow pigment dispersion within each specific range, thereby completing the present invention.

In other words, in the present invention, the weight average molecular weight and acid value of the dispersing resin in the pigment dispersion can adjust the number of double bonds and thus increase the degree of curing to improve the film residual ratio and further more ensure the developability.

The pigment dispersion according to the embodiment comprises a green pigment dispersion and a yellow pigment dispersion, wherein the green pigment dispersion comprises a first dispersing resin having a weight average molecular weight of 8000 g/mol to 12000 g/mol and an acid value of 100 mg potassium hydroxide/g to 140 mg potassium hydroxide/g and a green pigment, and the yellow pigment dispersion comprises a second dispersing resin having a weight average molecular weight of 8000 g/mol to 12000 g/mol and an acid value of less than 100 mg potassium hydroxide/g and a yellow pigment.

As described above, the weight average molecular weight and acid value of the first dispersing resin, the dispersing resin of the green pigment, and the weight average molecular weight and acid value of the second dispersing resin, the dispersing resin of the yellow pigment may be limited to improve patternability and at the same time also improve film residue ratio and developability. Specifically, when the weight average molecular weight of the first dispersing resin constituting the green pigment dispersion is within the range of 8000 g/mol to 12000 g/mol but the acid value is not within the range of 100 mg KOH/g to 140 mg KOH/g, patternability, degree of curing, film residue ratio, developability, and the like may not be improved at the same time, and similarly, when the acid value of the first dispersing resin is within the range of 100 mg KOH/g to 140 mg KOH/g but the weight average molecular weight is not within the range of 8000 g/mol to 12000 g/mol, patternability, degree of curing, film residue ratio, developability, and the like may not be improved at the same time. In addition, when the weight average molecular weight of the second dispersing resin constituting the yellow pigment dispersion is within the range of 8000 g/mol to 12000 g/mol but the acid value is 100 mg KOH/g or greater than 100 mg KOH/g, patternability, degree of curing, film residue ratio, developability, and the like may not be improved at the same time, and similarly, when the acid value of the first dispersing resin is less than 100 mg KOH/g but the weight average molecular weight is not within the range of 8000 g/mol to 12000 g/mol, patternability, degree of curing, film residue ratio, developability, and the like may not be improved at the same time. In other words, the pigment dispersion according to one embodiment may be in the form of a mixture of a green pigment dispersion and a yellow pigment dispersion, wherein the weight average molecular weight and acid value of the first dispersing resin constituting the green pigment dispersion and the second dispersing resin constituting the yellow pigment dispersion should be precisely controlled simultaneously to simultaneously improve patternability, degree of curing, film residue ratio, developability, and the like.

The first dispersed resin and the second dispersed resin may each independently be an acrylic resin.

The acrylic resin is a copolymer of a first ethylenically unsaturated monomer and a second ethylenically unsaturated monomer copolymerizable therewith, and is a resin containing at least one acrylic acid repeating unit.

The first ethylenically unsaturated monomer may be an ethylenically unsaturated monomer including at least one carboxyl group, and examples of the monomer may include acrylic acid, methacrylic acid, maleic acid, itaconic acid, fumaric acid, and combinations thereof.

The first ethylenically unsaturated monomer may be included in an amount of 5 wt % to 50 wt %, for example, 10 wt % to 40 wt %, based on the total amount of the acrylic resin.

The second ethylenically unsaturated monomer may be: an aromatic vinyl compound such as styrene, α-methylstyrene, vinyltoluene, vinylbenzyl methyl ether and the like; an unsaturated carboxylic acid ester compound such as methyl (meth)acrylate, ethyl (meth)acrylate, butyl (meth)acrylate, 2-hydroxyethyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, benzyl (meth)acrylate, cyclohexyl (meth)acrylate, phenyl (meth)acrylate and the like; an unsaturated aminoalkyl carboxylic acid ester compound such as 2-Aminoethyl (meth)acrylate, 2-dimethylaminoethyl (meth)acrylate, and the like; carboxylic acid vinyl ester compounds, such as vinyl acetate, vinyl benzoate, and the like; unsaturated glycidyl carboxylic acid ester compounds, such as glycidyl (meth)acrylate, and the like; vinyl cyanide compounds, such as (meth)acrylonitrile, and the like; unsaturated amide compounds, such as (meth)acrylamide, and the like; and the like, and may be used alone or in a mixture of two or more.

Specific examples of the acrylic resin may be (meth)acrylic acid/benzyl methacrylate copolymer, (meth)acrylic acid/benzyl methacrylate copolymer, (meth)acrylic acid/benzyl methacrylate/styrene copolymer, (meth)acrylic acid/benzyl methacrylate/2-hydroxyethyl methacrylate copolymer, (meth)acrylic acid/benzyl methacrylate/styrene/2-hydroxyethyl methacrylate copolymer, and the like, but are not limited thereto, and these may be used alone or in the form of a mixture of two or more.

The T green pigment may be a halogen-substituted copper phthalocyanine pigment in the color index, such as C.I. Green Pigment 59, C.I. Green Pigment 58, C.I. Green Pigment 36 or C.I. Green Pigment 7, which may be used alone or in a combination of two or more, but the present invention is not limited thereto.

The yellow pigment may be an isoindoline pigment in the color index, such as C.I. Yellow Pigment 139; a quinoline yellow pigment, such as C.I. Yellow Pigment 138; a nickel composite pigment, such as C.I. Yellow Pigment 150, C.I. Yellow Pigment 100, and the like, which may be used alone or in a combination of two or more, but the present invention is not limited thereto.

The pigment dispersion according to the embodiment may further include a red pigment, a blue pigment, and the like, and another dispersing resin capable of dispersing the red pigment and/or the blue pigment may be mixed with the red pigment and/or the blue pigment.

The red pigment may be C.I. red pigment 179, C.I. red pigment 254, C.I. red pigment 255, C.I. red pigment 264, C.I. red pigment 270, C.I. red pigment 272, C.I. red pigment 177, C.I. red pigment 89 and the like in the color index, which may be used alone or in a combination of two or more, but the present invention is not limited thereto.

The blue pigment may be C.I. blue pigment 15:6, C.I. blue pigment 15:0, C.I. blue pigment 15:1, C.I. blue pigment 15:2, C.I. blue pigment 15:3, C.I. blue pigment 15:4, C.I. blue pigment 15:5, C.I. blue pigment 15:6, or C.I. blue pigment 16 in the color index, and they may be used alone or in a combination of two or more, but the present invention is not limited thereto.

For example, the green pigment dispersion may be included in a greater amount than the yellow pigment dispersion.

For example, the weight ratio of the green pigment dispersion to the yellow pigment dispersion may be 1.41: 1 to 2.46: 1. When the weight ratio of the green pigment dispersion to the yellow pigment dispersion is within the above range, patternability may be greatly improved.

For example, the pigment dispersion may further contain a dispersant and a solvent.

That is, in addition to the dispersing resin, a dispersant can be used together to disperse the pigment. Specifically, the pigment can be surface-treated with a dispersant in advance, or a dispersant can be added when preparing the composition and used together with the pigment. On the other hand, the type of solvent constituting the pigment dispersion is described below.

The dispersant may be a nonionic dispersant, an anionic dispersant, a cationic dispersant, and the like. Specific examples of the dispersant include polyalkylene glycols and esters thereof, polyalkylene oxides, polyol ester epoxide adducts, alcohol epoxide adducts, sulfonic acid esters, sulfonic acid salts, carboxylic acid esters, carboxylic acid salts, alkylamide epoxide adducts, alkylamines, and the like, and these may be used alone or in combination of two or more.

For example, commercially available products of the dispersant may be DISPERBYK-101, DISPERBYK-130, DISPERBYK-140, DISPERBYK-160, DISPERBYK-161, DISPERBYK-162, DISPERBYK-163, DISPERBYK-164, DISPERBYK-165, DISPERBYK-166, DISPERBYK-170, DISPERBYK-171, DISPERBYK-182, DISPERBYK-2000, DISPERBYK-2001 and the like from BYK Co., Ltd.; Co.'s Efka-47, Efka-47EA, Efka-48, Efka-49, Efka-100, Efka-400, Efka-450 and the like; Zeneka Co.'s Solsperse 5000, Solsperse 12000, Solsperse 13240, Solsperse 13940, Solsperse 17000, Solsperse 20000, Solsperse 24000GR, Solsperse 27000, Solsperse 28000 and the like; or Ajinomoto Inc.'s PB711, PB821 and the like.

The dispersant may be included in an amount of 0.1 wt % to 15 wt % based on the total amount of the photosensitive resin composition. When the dispersant is included in the above, the composition has excellent dispersibility, and thus has excellent stability, developability, and patternability when manufacturing a color filter.

The pigment may be used after pretreatment with a water-soluble inorganic salt and a wetting agent. When the pigment is used after pretreatment, the initial particle size of the pigment may become finer.

The pretreatment may be performed by kneading the pigment with a water-soluble inorganic salt and a wetting agent, and then filtering and washing the kneaded pigment.

Kneading may be performed at a temperature within a range of 40°C to 100°C, and filtering and washing may be performed by filtering the pigment after washing away the inorganic salt with water and the like.

Examples of water-soluble inorganic salts include sodium chloride, potassium chloride, and the like, but are not limited thereto. The wetting agent allows the pigment and the water-soluble inorganic salt to be uniformly mixed and pulverized, and examples of the wetting agent include alkylene glycol monoalkyl ethers, such as ethylene glycol monoethyl ether, propylene glycol monomethyl ether, diethylene glycol monomethyl ether; alcohols, such as ethanol, isopropyl alcohol, butanol, hexanol, cyclohexanol, ethylene glycol, diethylene glycol, polyethylene glycol, glycerol polyethylene glycol, and can be used alone or in combination of two or more.

The pigment after kneading may have an average particle diameter of 5 nm to 200 nm, for example, 5 nm to 150 nm. When the average particle diameter of the pigment is within the above range, the stability in the pigment dispersion is improved and the resolution of the image element can be reduced.

The pigment dispersion according to embodiment can comprise dispersant and solvent and solid pigment and dispersing resin described below.By the total amount of pigment dispersion, can 5 % by weight to 20 % by weight, for example 8 % by weight to 15 % by weight amount comprise solid pigment.

Another embodiment provides a photosensitive resin composition comprising a pigment dispersion.

By the total amount of the photosensitive resin composition, the pigment dispersion can be included in an amount of 50% by weight to 90% by weight. Generally speaking, by the total amount of the photosensitive resin composition, the photosensitive resin composition uses a high content of coloring agent, such as 50% by weight to 90% by weight, so as to reproduce high color, wherein there may be a problem of shrinkage of patternability as described above. However, the pigment dispersion according to an embodiment can reproduce high color and maintain excellent patternability regardless of high content as described above by controlling the weight average molecular weight and acid value of the pigment of a specific color and the dispersed resin that can disperse the pigment and using the pigment dispersion of different colors.

For example, the photosensitive resin composition may further include a binder resin, a photopolymerizable monomer, a photopolymerization initiator, and a solvent.

（ Adhesive resin ）

The adhesive resin may include an indole-based adhesive resin, an acrylic adhesive resin, or a combination thereof. The indole-based resin may be a conventional curable resin (or photosensitive resin) composition, and may be generally used as disclosed in Korean Patent Application Laid-Open No. 10-2018-0067243, for example, but is not limited thereto.

For example, the adhesive resin may include one or two or more than two different acrylic adhesive resins.

The weight average molecular weight of the acrylic binder resin may be 3,000 g/mol to 150,000 g/mol, for example, 5,000 g/mol to 50,000 g/mol, for example, 20,000 g/mol to 30,000 g/mol. When the acrylic binder resin has a weight average molecular weight within the range, the photosensitive resin composition has good physical and chemical properties, appropriate viscosity, and close contact properties with a substrate during the manufacture of the color filter.

The acid value of the acrylic binder resin may be 15 mg KOH/g to 60 mg KOH/g, and specifically 20 mg KOH/g to 50 mg KOH/g. When the acid value of the acrylic binder resin is within the range, the resolution of the element pattern is improved.

The acrylic binder resin may be the same as described for the dispersing resin constituting the pigment dispersion except for the weight average molecular weight and the acid value.

When the adhesive resin further includes an indole-based adhesive resin and an acrylic adhesive resin, it is effective to realize low reflection characteristics and improve resolution.

For example, when the binder resin includes an acrylic binder resin and an indole-based binder resin, the indole-based binder resin may be included in an amount greater than that of the acrylic binder resin. When the indole-based binder resin is included in an amount greater than that of the acrylic binder resin, it may be more advantageous to achieve both low reflection characteristics and excellent resolution. In addition, it may be advantageous to improve developability and process margin.

The adhesive resin may further include a polyimide-based adhesive resin, a polyurethane-based adhesive resin, or a combined resin thereof in addition to the indole-based adhesive resin and the acrylic adhesive resin.

The weight average molecular weight of the indole-based binder resin may be 1,000 g/mol to 50,000 g/mol, and specifically 3,000 g/mol to 35,000 g/mol. When the weight average molecular weight of the indole-based binder resin is within the above range, excellent patternability and developability may be obtained when manufacturing a color filter.

The binder resin may be included in an amount of 0.1 wt % to 5 wt %, for example, 0.1 wt % to 3 wt %, based on the total amount of the photosensitive resin composition. When the binder resin is included within the above range, viscosity is appropriately maintained, and thus patternability, processability, and developability are excellent in manufacturing a color filter.

（ Photopolymerizable monomer ）

The photopolymerizable monomer may be a monofunctional or polyfunctional ester of (meth)acrylic acid containing at least one ethylenically unsaturated double bond.

The photopolymerizable monomer has an ethylenically unsaturated double bond and thus can induce sufficient polymerization during the exposure period of the pattern forming process and form a pattern having excellent heat resistance, light resistance and chemical resistance.

The photopolymerizable monomer may be, for example, ethylene glycol di(meth)acrylate, diethylene glycol di(meth)acrylate, triethylene glycol di(meth)acrylate, propylene glycol di(meth)acrylate, neopentyl glycol di(meth)acrylate, 1,4-butanediol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, bisphenol A di(meth)acrylate, pentaerythritol di(meth)acrylate, pentaerythritol (meth)acrylate, pentaerythritol tetra(meth)acrylate. ) acrylate, pentaerythritol hexa(meth)acrylate, dipentaerythritol (meth)acrylate, dipentaerythritol tri(meth)acrylate, dipentaerythritol penta(meth)acrylate, dipentaerythritol hexa(meth)acrylate, bisphenol A epoxy (meth)acrylate, ethylene glycol monomethyl ether (meth)acrylate, trihydroxymethylpropane tri(meth)acrylate, tri(meth)acryloyloxyethyl phosphate, novolac epoxy (meth)acrylate or a combination thereof.

Commercially available examples of photopolymerizable monomers are as follows. Monofunctional (meth)acrylates may include Aronix M- ^101® , Aronix M- ^111® , Aronix M- ^114® of Toagosei Chemistry Industry Co., Ltd.; KAYARAD TC-110S®, KAYARAD TC- ^120S® of Nippon Kayaku Co., Ltd ^.; V- ^158® , V- ^2311® of Osaka Organic Chemical Ind., Ltd., and the like. Examples of difunctional (meth)acrylates may include Aniks M- ^210® , Aniks M- ^240® , Aniks M- ^6200® from Toagosei Chemical Industry Co., Ltd.; Kaylade ^HDDA® , Kaylade HX- ^220® , Kaylade R-604® from Nippon Kayaku Co., Ltd ^.; V- ^260® , V- ^312® , V- ^335HP® from Osaka Organic Chemical Industry Co., Ltd., and the like. Examples of trifunctional (meth)acrylates may include Aniks M- ^309® , Aniks M- ^400® , Aniks M-405®, Aniks M- ^450® , Aniks M- ^7100® , Aniks M- ^8030® , Aniks M- ^8060® and the like from Toa Gosei Chemical Industry Co., Ltd.; Caylade ^TMPTA® , Caylade DPCA- ^20® , Caylade DPCA- ^30® , Caylade DPCA- ^60® , Caylade DPCA- ^120® from Nippon Kayaku Co. ^, Ltd.; V- ^295® , V- ^300® , V- ^360® from Osaka Yuki Kayaku Kogyo Co., Ltd. , V-GPT ^® , V-3PA ^® , V-400 ^® and the like. These may be used alone or in a mixture of two or more.

The photopolymerizable monomers may be treated with anhydrides to improve developing properties.

The photopolymerizable monomer may be included in an amount of 0.5 wt % to 10 wt %, for example, 0.5 wt % to 5 wt %, based on the total amount of the photosensitive resin composition. When the photopolymerizable monomer is included within the range, the photopolymerizable monomer is sufficiently cured during exposure in a pattern forming process and has excellent reliability of the pattern, excellent heat resistance, light resistance, and chemical resistance, and has excellent resolution and close contact properties.

（ Photopolymerization initiator ）

The photopolymerization initiator includes an oxime initiator (compound) and an acetophenone initiator (compound). A mixture of the two types of photopolymerization initiators can be used together with the aforementioned coloring agent composition to provide a photosensitive resin composition capable of achieving a low taper angle.

Examples of acetophenone compounds include 2,2'-diethoxyacetophenone, 2,2'-dibutoxyacetophenone, 2-hydroxy-2-methylpropiophenone, p-tert-butyltrichloroacetophenone, p-tert-butyldichloroacetophenone, 4-chloroacetophenone, 2,2'-dichloro-4-phenoxyacetophenone, 2-methyl-1-(4-(methylthio)phenyl)-2-morpholinopropan-1-one, 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl)-butan-1-one, and the like.

Examples of oxime compounds include O-acyloxime compounds, 2-(o-benzoyloxime)-1-[4-(phenylthio)phenyl]-1,2-octanedione, 1-(o-acetyloxime)-1-[9-ethyl-6-(2-methylbenzoyl)-9H-oxazol-3-yl]ethanone, O-ethoxycarbonyl-α-oxyamino-1-phenylpropan-1-one, and the like. Specific examples of O-oxime compounds may be 1,2-octanedione, 2-dimethylamino-2-(4-methylbenzyl)-1-(4-porphyrin-4-yl-phenyl)-butan-1-one, 1-(4-phenylthiophenyl)-butane-1,2-dione 2-oxime-O-benzoate, 1-(4-phenylthiophenyl)-octane-1,2-dione 2-oxime-O-benzoate, 1-(4-phenylthiophenyl)-octane-1,2-dione 2-oxime-O-benzoate, 1-(4-phenylthiophenyl)-octan-1-one oxime-O-acetate, and 1-(4-phenylthiophenyl)-butan-1-one oxime-O-acetate.

For example, the oxime-based initiator may be contained in an amount equal to or greater than that of the acetophenone-based initiator.

For example, the oxime-based initiator may be contained in an amount up to 9 times the content of the acetophenone-based initiator.

When the content relationship between the oxime initiator and the acetophenone initiator satisfies the above configuration, the taper angle of the pattern in the photosensitive resin layer can be further reduced.

In addition to the above compounds, the photopolymerization initiator may include oxazole compounds, diketone compounds, cobalt borate compounds, diazo compounds, imidazole compounds, biimidazole compounds, fluorenyl compounds, and the like.

The photopolymerization initiator may contain the above-exemplified compounds alone or in combination of two or more compounds.

A photopolymerization initiator may be used together with a photosensitizer that is capable of causing a chemical reaction by absorbing light and becoming excited and then transferring its energy.

Examples of the photosensitizer may be tetraethylene glycol di-3-butylene propionate, pentaerythritol tetra-3-butylene propionate, dipentaerythritol tetra-3-butylene propionate, and the like.

The photopolymerization initiator may be included in an amount of 0.01 wt % to 5 wt %, for example, 0.01 wt % to 3 wt %, based on the total amount of the photosensitive resin composition. When the photopolymerization initiator is included within the range, sufficient photopolymerization occurs during exposure in the pattern forming process, excellent reliability can be achieved, heat resistance, light resistance, and chemical resistance, resolution, and close contact characteristics of the pattern can be improved, and transmittance reduction can be prevented due to the non-reactive initiator.

（ Solvent ）

As the solvent, a material which is compatible with but does not react with the pigment dispersion, the photopolymerization initiator, the photopolymerizable monomer, and the binder resin can be used.

Examples of the solvent may include alcohols such as methanol, ethanol and the like; ethers such as dichloroethyl ether, n-butyl ether, diisoamyl ether, methyl phenyl ether, tetrahydrofuran and the like; glycol ethers such as ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol dimethyl ether and the like; glycoldimethylether; EDM) and the like; ethylene glycol ether acetates such as ethylene glycol ether methyl acetate, ethylene glycol ether ethyl acetate, ethylene glycol ether diethyl acetate and the like; carbitols such as methyl ethyl carbitol, diethyl carbitol, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol dimethyl ether, diethylene glycol ethyl methyl ether, diethylene glycol diethyl ether and the like; propylene glycol alkyl ether acetates such as propylene glycol methyl ether acetate, propylene glycol propyl ether acetate and the like; aromatic hydrocarbons such as toluene, xylene and the like; ketones such as methyl ethyl ketone, cyclohexanone, 4-hydroxy-4-methyl-2-pentanone, methyl-n-acetone, methyl ethyl acetate, isobutyl acetate and the like; lactic acid esters such as methyl lactate, ethyl lactate and the like; oxyacetic acid alkyl esters such as methyl oxyacetate, ethyl oxyacetate, butyl oxyacetate and the like; alkoxyacetic acid alkyl esters such as methyl methoxyacetate, ethyl methoxyacetate, butyl methoxyacetate, methyl ethoxyacetate, ethyl ethoxyacetate and the like; 3-oxypropionic acid alkyl esters such as methyl 3-oxypropionic acid, ethyl 3-oxypropionic acid and the like; 3-alkoxypropionic acid alkyl esters such as methyl 3-methoxypropionic acid, methyl 3-methoxypropionic acid, ethyl 3-methoxypropionic acid and the like. ethyl 2-ethoxypropionate, ethyl 2-ethoxypropionate, methyl 2-ethoxypropionate and the like; alkyl 2-oxypropionates, such as methyl 2-oxypropionate, ethyl 2-oxypropionate, methyl 2-oxypropionate and the like; alkyl 2-alkoxypropionates, such as methyl 2-methoxypropionate, ethyl 2-methoxypropionate, ethyl 2-ethoxypropionate, methyl 2-ethoxypropionate and the like; 2-oxy-2-methylpropanoates, such as methyl 2-oxy-2-methylpropionate, ethyl 2-oxy-2-methylpropionate; monooxymonocarboxylic acid alkyl esters of alkyl 2-alkoxy-2-methylpropionates, such as methyl 2-methoxy-2-methylpropionate, ethyl 2-ethoxy-2-methylpropionate and the like esters such as 2-hydroxyethyl propionate, 2-hydroxy-2-methylethyl propionate, hydroxyethyl acetate, 2-hydroxy-3-methylmethyl butyrate and the like; ketoesters such as ethyl pyruvate and the like; high boiling point solvents such as N-methylformamide, N,N-dimethylformamide, N-methylformaniline, N-methylacetamide, N,N-dimethylacetamide, N-methylpyrrolidone, dimethyl sulfoxide, benzyl ethyl ether, dihexyl ether, acetylacetone, isophorone, hexanoic acid, octanoic acid, 1-octanol, 1-nonanol, benzyl alcohol, benzyl acetate, ethyl benzoate, diethyl oxalate, diethyl maleate, γ-butyrolactone, ethylene carbonate, propylene carbonate, ethylene glycol ethyl ether phenyl acetate and the like.

In consideration of compatibility and reactivity, ketones such as cyclohexanone and the like; glycol ethers such as ethylene glycol monoethyl ether, ethylene glycol dimethyl ether, ethylene glycol diethyl ether and the like; ethylene glycol alkyl ether acetates such as ethylene glycol ethyl ether ethyl acetate and the like; esters such as 2-hydroxyethyl propionate and the like; carbitols such as diethylene glycol monomethyl ether and the like; propylene glycol glycol alkyl ether acetates such as propylene glycol monomethyl ether acetate, propylene glycol propyl ether acetate and the like can be desirably used.

The solvent may be contained in a residual amount, for example, 20 wt % to 70 wt %, for example, 20 wt % to 60 wt %, for example, 25 wt % to 55 wt %, based on the total amount of the photosensitive resin composition. When the solvent is contained within the range, the photosensitive resin composition may have an appropriate viscosity, thereby improving the coating properties of the color filter.

（ Other additives ）

Meanwhile, the photosensitive resin composition may further include malonic acid, 3-amino-1,2-propanediol, a silane coupling agent, a leveling agent, a fluorine-based surfactant, a free radical polymerization initiator or a combination thereof.

The silane coupling agent may have a reactive substituent, such as a vinyl group, a carboxyl group, a methacryl group, an isocyanate group, and an epoxy group, so as to improve the close contact property with the substrate.

Examples of the silane coupling agent may be trimethoxysilylbenzoic acid, γ-methacryloyloxypropyltrimethyloxysilane, vinyltriacetoxysilane, vinyltrimethoxysilane, γ-isocyanatepropyltriethoxysilane, γ-polysaccharide epoxypropyltrimethoxysilane, β-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, and the like, which may be used alone or in the form of a mixture of 2 or more types.

The silane coupling agent may be included in an amount of 0.01 to 10 parts by weight based on 100 parts by weight of the photosensitive resin composition. When the silane coupling agent is included within the above range, close contact properties and storage properties are improved.

In addition, the photosensitive resin composition may further include a surfactant such as a fluorine-based surfactant to improve coating properties and prevent defect formation as necessary.

Examples of the fluorine-based surfactant may be commercially available fluorine-based surfactants such as BM- ^1000® , BM- ^1100® and the like from BM Chemie Inc.; ^F142D® , F172®, ^F173® , ^F183® , ^F554® and the like from Dainippon Ink Kagaku Kogyo Co.; FULORAD FC- ^135® , FULORAD FC- ^170C® , FULORAD FC- ^430® , FULORAD FC- ^431® and the like from Sumitomo ^3M Co., Ltd.; SURFLON S- ^112® from ASAHI Glass Co., Ltd. , Thron S-113 ^® , Thron S-131 ^® , Thron S-141 ^® , Thron S-145 ^® and the like; SH-28PA ^® , SH-190 ^® , SH-193 ^® , SZ-6032 ^® , SF-8428 ^® and the like.

The fluorine-based surfactant may be included in an amount of 0.001 to 5 parts by weight based on 100 parts by weight of the photosensitive resin composition. When the surfactant is included in the above range, coating uniformity is ensured, contamination does not occur, and wettability of the IZO substrate or glass substrate is improved.

In addition, unless the properties are deteriorated, the photosensitive resin composition may further contain other additives such as an oxidation inhibitor, a stabilizer, and the like in a predetermined amount.

Another embodiment provides a photosensitive resin layer manufactured by exposing, developing and curing the aforementioned photosensitive resin composition.

The method of forming a pattern in the photosensitive resin layer is as follows.

(1) Coating and film formation

The photosensitive resin composition is coated on a substrate subjected to a predetermined pretreatment, such as a glass substrate or an IZO substrate, and the like, to have a desired thickness using a spin coating or slit coating method, a roll coating method, a screen printing method, a coater method, and the like, and is heated at about 70° C. to about 100° C. for 1 minute to 10 minutes through a VCD process or the like to remove the solvent and form a photosensitive resin layer.

(2) Exposure

In order to form a desired pattern, a mask consisting of a half-tone portion implementing a black matrix pattern and a full-tone portion implementing a columnar spacer pattern is inserted, and then 200 nm to 500 nm actinic rays are irradiated to the obtained photosensitive resin layer. As a light source for irradiation, a low-pressure mercury lamp, a high-pressure mercury lamp, an ultra-high-pressure mercury lamp, a metal halide lamp, an argon laser, etc. can be used, and in some cases, X-rays, electron beams, and the like can be used.

When a high-pressure mercury lamp is used, the exposure process uses a light dose of, for example, 500 mJ/cm2 or less (using a 365 nm sensor). However, the light dose may vary depending on the types of the various components, their combination ratios, and the dry film thickness.

(3) Imaging

In the developing method, after the exposure process, an alkaline aqueous solution is used as a developing solution to dissolve and remove unnecessary portions, thereby leaving only the exposed portions to form a pattern.

(4) Post-processing

There is a post-heating process for obtaining a pattern having improved heat resistance, light resistance, close contact properties, crack resistance, chemical resistance, high strength, and storage stability of an image pattern obtained by development in the above process.

Another embodiment provides a color filter including a photosensitive resin layer.

Another embodiment provides a display device including a color filter.

The display device may be, for example, a liquid crystal display (LCD) (for organic LEDs), a solid-state imaging device, and the like, but is not necessarily limited thereto.

Hereinafter, the present invention is described in more detail with reference to examples. However, the following examples are only preferred examples of the present invention, and the present invention is not limited to the following examples.

（ Examples ）

（ Preparation of green pigment dispersion ）

Preparation Example 1-1

A green pigment dispersion is prepared by mixing a first dispersing resin having a weight average molecular weight of 8000 g/mol and an acid value of 100 mg potassium hydroxide/g with C.I. Pigment Green 58 (ENF Technology Co., Ltd.) under a dispersant and performing a dispersion process using a dispersing device (e.g., a bead mill and the like). The dispersion process may be performed by further adding a solvent and/or a pigment derivative thereto as needed.

Preparation Example 1-2

A green pigment dispersion was prepared in the same manner as in Preparation Example 1-1, except that a first dispersing resin having a weight average molecular weight of 8000 g/mol and an acid value of 140 mg potassium hydroxide/g was used instead of a first dispersing resin having a weight average molecular weight of 8000 g/mol and an acid value of 100 mg potassium hydroxide/g.

Preparation Example 1-3

A green pigment dispersion was prepared in the same manner as in Preparation Example 1-1 except that a first dispersing resin having a weight average molecular weight of 12000 g/mol and an acid value of 100 mg potassium hydroxide/g was used instead of a first dispersing resin having a weight average molecular weight of 8000 g/mol and an acid value of 100 mg potassium hydroxide/g.

Preparation Example 1-4

A green pigment dispersion was prepared in the same manner as in Preparation Example 1-1 except that a first dispersing resin having a weight average molecular weight of 12,000 g/mol and an acid value of 140 mg potassium hydroxide/g was used instead of a first dispersing resin having a weight average molecular weight of 8,000 g/mol and an acid value of 100 mg potassium hydroxide/g.

Comparison of preparation examples C-1

A green pigment dispersion was prepared in the same manner as in Preparation Example 1-1 except that a first dispersing resin having a weight average molecular weight of 8000 g/mol and an acid value of 90 mg potassium hydroxide/g was used instead of a first dispersing resin having a weight average molecular weight of 8000 g/mol and an acid value of 100 mg potassium hydroxide/g.

Comparison of preparation examples C-2

A green pigment dispersion was prepared in the same manner as in Preparation Example 1-1 except that a first dispersing resin having a weight average molecular weight of 12,000 g/mol and an acid value of 150 mg potassium hydroxide/g was used instead of a first dispersing resin having a weight average molecular weight of 8,000 g/mol and an acid value of 100 mg potassium hydroxide/g.

Comparison of preparation examples C-3

A green pigment dispersion was prepared in the same manner as in Preparation Example 1-1 except that a first dispersing resin having a weight average molecular weight of 7000 g/mol and an acid value of 100 mg potassium hydroxide/g was used instead of a first dispersing resin having a weight average molecular weight of 8000 g/mol and an acid value of 100 mg potassium hydroxide/g.

Comparison of preparation examples C-4

A green pigment dispersion was prepared in the same manner as in Preparation Example 1-1, except that a first dispersing resin having a weight average molecular weight of 13,000 g/mol and an acid value of 140 mg potassium hydroxide/g was used instead of a first dispersing resin having a weight average molecular weight of 8,000 g/mol and an acid value of 100 mg potassium hydroxide/g.

(Preparation of yellow pigment dispersion)

Preparation Example 2-1

A yellow pigment dispersion is prepared by mixing a second dispersing resin having a weight average molecular weight of 8000 g/mol and an acid value of 95 mg potassium hydroxide/g with C.I. Pigment Yellow 185 (ENF Technology Co., Ltd.) under a dispersant and performing a dispersion process using a dispersing device (e.g., a bead mill and the like). The dispersion process may be performed by further adding a solvent and/or a pigment derivative thereto as necessary.

Preparation Example 2-2

A yellow pigment dispersion was prepared in the same manner as in Preparation Example 2-1, except that a second dispersing resin having a weight average molecular weight of 12,000 g/mol and an acid value of 95 mg potassium hydroxide/g was used instead of a second dispersing resin having a weight average molecular weight of 8,000 g/mol and an acid value of 95 mg potassium hydroxide/g.

Comparison of preparation examples C-5

A yellow pigment dispersion was prepared in the same manner as in Preparation Example 2-1 except that a second dispersing resin having a weight average molecular weight of 7000 g/mol and an acid value of 95 mg potassium hydroxide/g was used instead of a second dispersing resin having a weight average molecular weight of 8000 g/mol and an acid value of 95 mg potassium hydroxide/g.

Comparison of preparation examples C-6

A yellow pigment dispersion was prepared in the same manner as in Preparation Example 2-1, except that a second dispersing resin having a weight average molecular weight of 13,000 g/mol and an acid value of 95 mg potassium hydroxide/g was used instead of the second dispersing resin having a weight average molecular weight of 8,000 g/mol and an acid value of 95 mg potassium hydroxide/g.

Comparison of preparation examples C-7

A yellow pigment dispersion was prepared in the same manner as in Preparation Example 2-1 except that a second dispersing resin having a weight average molecular weight of 10,000 g/mol and an acid value of 100 mg potassium hydroxide/g was used instead of a second dispersing resin having a weight average molecular weight of 8,000 g/mol and an acid value of 95 mg potassium hydroxide/g.

( Preparation of photosensitive resin composition )

Examples 1 To the instance 6 and comparison examples 1 To compare examples 4

Each photosensitive resin composition was prepared to have the composition shown in Table 1, wherein a photopolymerization initiator was added to a solvent and dissolved therein by stirring at room temperature for 1 hour. Subsequently, a binder resin and a photopolymerizable monomer were added thereto, and then stirred at room temperature for 1 hour. Subsequently, other additives were added thereto, and then stirred at room temperature for 1 hour. Then, each pigment dispersion was added thereto, and then stirred at room temperature for 2 hours, and the aforementioned solution was filtered three times to remove impurities, thereby preparing photosensitive resin compositions according to Examples 1 to 6 and Comparative Examples 1 to 4. The following components were used to prepare the photosensitive resin composition. (A) Acrylic adhesive resin Acrylic adhesive resin (SP-RY16, Showa Denko K.K.) (B) Photopolymerizable monomer (B-1) DPHA (Nippon Kayaku Co., Ltd.) (B-2) M2100 (Miwon Specialty) (C) Photopolymerization initiator (C-1) OXE01 (BASF) (C-2) OXE02 (BASF) (D) Pigment dispersion (D-1) Preparation Example 1-1 (D-2) Preparation Example 1-2 (D-3) Preparation Example 1-3 (D-4) Preparation Example 1-4 (D-5) Preparation Example 2-1 (D-6) Preparation Example 2-2 (D-7) Comparative preparation example C-1 (D-8) Comparative preparation example C-2 (D-9) Comparative preparation example C-3 (D-10) Comparative preparation example C-4 (D-11) Comparative preparation example C-5 (D-12) Comparative preparation example C-6 (D-13) Comparative preparation example C-7 (E) Solvent Propylene glycolmonomethylethylacetate (PGMEA, Sigma-Aldrich Co., Ltd.) (F) Other additives (F-1) Fluorine-based surfactant (F-554, DIC Co., Ltd.) (F-2) Coupling agent (KBM-503, ShinEtsu Chemical Co.)

(Table 1) (unit; weight %) Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Comparison Example 1 Comparison Example 2 Comparison Example 3 Comparison Example 4 （A）Acrylic Adhesive Resin 0.51 0.51 0.51 0.51 0.51 0.51 0.51 0.51 0.51 0.51 (B) Photopolymerizable monomer (B-1) 1 1 1 1 1 1 1 1 1 1 (B-2) 0.77 0.77 0.77 0.77 0.77 0.77 0.77 0.77 0.77 0.77 (C) Photopolymerization initiator (C-1) 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 (C-2) 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 (D) Coloring agent (D-1) 48.1 - - - 51.31 - - - - - (D-2) - 48.1 - - - 41.2 - - - - (D-3) - - 48.1 - - - - - - - (D-4) - - - 48.1 - - - - - - (D-5) 23.61 - 23.61 - 20.4 - - - - - (D-6) - 23.61 - 23.61 - 30.51 - - - - (D-7) - - - - - - 48.1 - - - (D-8) - - - - - - - 48.1 - - (D-9) - - - - - - - - 48.1 - (D-10) - - - - - - - - - 48.1 (D-11) - - - - - - 23.61 - - 23.61 (D-12) - - - - - - - 23.61 - - (D-13) - - - - - - - - 23.61 - (E) Solvent 25.45 25.45 25.45 25.45 25.45 25.45 25.45 25.45 25.45 25.45 (F) Other additives (F-1) 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 (F-2) 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08

evaluate 1 ：Patternability Assessment

The photosensitive resin composition according to Examples 1 to 6 and Comparative Examples 1 to 4 was coated at a rpm capable of forming a predetermined thickness of each sample by using an applicator (MIKASA Co., Ltd.), and then pre-baked on a 90°C heating plate, exposed to an exposure device under the conditions of a dose: 40 mJ and a gap: 200 μm, and developed to form a pattern. Herein, a developer was prepared by diluting a Na ₂ CO ₃ solution, and the time (seconds) (BP) for pattern appearance was measured. Herein, BP should be at least 40 seconds or less. After development, the pattern substrate was baked in an oven at 230°C for 20 minutes to form a pattern. The pattern was confirmed by measuring the size relative to the width of 100 micrometers using an optical microscope with an optical zoom of 500 times. The pattern was confirmed by measuring the size relative to the width of 100 micrometers using an optical microscope, and the results of evaluation with the naked eye are shown in Table 2.

(Table 2) Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Comparison Example 1 Comparison Example 2 Comparison Example 3 Comparison Example 4 Residues ◎ ◎ ◎ ◎ ○ ○ X △ X △ Evaluation criteria for residual content◎: Very good○: Excellent△: PoorX: Very poor

evaluate 2 : Evaluation of membrane retention ratio

The photosensitive resin compositions according to Examples 1 to 6 and Comparative Examples 1 to 4 were coated on glass substrates to a thickness of 3 μm using a spin coater (Opticoat MS-A150, Mikasa Co., Ltd.), and then soft-baked on a hot plate at 80° C. for 120 seconds and exposed at 60 mJ using an exposure device (ghi broadband, Ushio Inc.). Subsequently, the coated compositions were developed using a developer (SSP-200, SVS) with a 0.2 wt % potassium hydroxide (KOH) aqueous solution. Subsequently, the developed substrates were hard-baked in a convection oven at 180° C. for 30 minutes. The thickness of the pattern after development (T1) and the thickness of the pattern after hard baking (T2) were measured to calculate the film residue ratio (%) according to Equation 1, and the results are shown in Table 3. [Equation 1] Film residue ratio (%) = (T ₂ /T ₁ ) x 100

(Table 3) Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Comparison Example 1 Comparison Example 2 Comparison Example 3 Comparison Example 4 Pattern film residual ratio (%) 82.0 81.5 82.2 82.3 80.3 80.9 77.0 78.2 76.4 78.4

Referring to Tables 2 and 3, the photosensitive resin composition according to one embodiment achieves high color and exhibits excellent patternability and film residue ratio by controlling the weight average molecular weight and acid value of the dispersion resin including the pigment dispersion according to the specific color of the pigment. In addition, when the weight ratio of the green pigment dispersion to the yellow pigment dispersion is 1.41:1 to 2.46:1, the patternability improvement effect is maximized.

Although the present invention has been described in conjunction with what are currently considered to be practical example embodiments, it should be understood that the present invention is not limited to the disclosed embodiments, but on the contrary, the present invention is intended to cover various modifications and equivalent arrangements included in the spirit and scope of the patent application. Therefore, the foregoing embodiments should be understood as illustrative and not limiting the present invention in any way.

without.

without.

Claims (10)

A pigment dispersion comprises: a green pigment dispersion, comprising a first dispersing resin having a weight average molecular weight of 8000 g/mol to 12000 g/mol and an acid value of 100 mg potassium hydroxide/g to 140 mg potassium hydroxide/g, and a green pigment; and a yellow pigment dispersion, comprising a second dispersing resin having a weight average molecular weight of 8000 g/mol to 12000 g/mol and an acid value of less than 100 mg potassium hydroxide/g, and a yellow pigment, wherein the first dispersing resin and the second dispersing resin are each independently an acrylic resin, wherein the acrylic resin is a copolymer of a first olefinic unsaturated monomer and a second olefinic unsaturated monomer copolymerizable therewith, wherein the first olefinic unsaturated monomer is (meth)acrylic acid, and the second olefinic unsaturated monomer is (meth)acrylic acid. The unsaturated monomer is selected from the group consisting of styrene, 2-hydroxyethyl methacrylate and benzyl methacrylate, wherein the first ethylene-based unsaturated monomer is contained in an amount of 5 wt% to 50 wt% based on the total amount of the acrylic resin, wherein the acrylic resin is selected from the group consisting of (meth)acrylic acid/benzyl methacrylate copolymer, (meth)acrylic acid/benzyl methacrylate/styrene copolymer, (meth)acrylic acid/benzyl methacrylate/2-hydroxyethyl methacrylate copolymer, (meth)acrylic acid/benzyl methacrylate/styrene/2-hydroxyethyl methacrylate copolymer and a combination thereof, and wherein the weight ratio of the green pigment dispersion to the yellow pigment dispersion is 1.41:1 to 2.46:1. The pigment dispersion as described in claim 1, wherein the pigment dispersion further comprises a dispersant and a solvent. A photosensitive resin composition comprising a pigment dispersion as described in claim 1 or 2. The photosensitive resin composition as described in claim 3, wherein the pigment dispersion is contained in an amount of 50 wt% to 90 wt% based on the total amount of the photosensitive resin composition. The photosensitive resin composition as described in claim 3, wherein the photosensitive resin composition further comprises a binder resin, a photopolymerizable monomer, a photopolymerization initiator and a solvent. The photosensitive resin composition as described in claim 5, wherein the photosensitive resin composition comprises, based on the total amount of the photosensitive resin composition: 0.1 wt% to 5 wt% of the binder resin; 0.5 wt% to 10 wt% of the photopolymerizable monomer; 0.01 wt% to 5 wt% of the photopolymerization initiator; 50 wt% to 90 wt% of the pigment dispersion; and the remaining amount of the solvent. The photosensitive resin composition as described in claim 5, wherein the photosensitive resin composition further comprises additives of malonic acid, 3-amino-1,2-propanediol, silane coupling agent, leveling agent, fluorine-based surfactant, free radical polymerization initiator or a combination thereof. A photosensitive resin layer is manufactured using the photosensitive resin composition described in claim 3. A color filter, comprising a photosensitive resin layer as described in claim 8. A display device comprising the color filter as described in claim 9.