KR102558671B1 - A blue photosensitive resin composition, blue color filter and display device comprising the same - Google Patents

Abstract

The present invention is a blue photosensitive resin composition comprising a blue colorant, an alkali-soluble resin, a photopolymerizable compound, a photopolymerization initiator and a solvent, wherein the blue colorant includes a blue pigment and a black pigment, and the blue photosensitive resin composition has a spectral transmittance of 60% or more and less than 75% at 425 to 480 nm, and a spectral transmittance at 530 to 780 nm of more than 0% and less than 20%, a blue color filter comprising the same and display elements.

Description

Blue photosensitive resin composition, blue color filter and display device comprising the same

The present invention relates to a blue photosensitive resin composition, a blue color filter and a display device including the same, and more particularly, a blue photosensitive resin composition having a spectral transmittance of 60% or more and less than 75% at 425 to 480 nm and a spectral transmittance of more than 0% and less than 20% at 530 to 780 nm, and a blue color filter and a display device including the same.

As a next-generation display technology, a flexible display device is recently in the limelight. As a technology for manufacturing a display on a plastic substrate having a bendable characteristic, various technologies such as a liquid crystal display device, an organic light emitting device, and an electronic paper (E-Paper) technology are being used in the field of flexible display devices.

However, in order for the flexible display device to be applied in practice, it should be capable of realizing full color, have low power consumption, and be easily readable even outdoors when compared to various current display products.

In this sense, the organic light emitting device has become the most useful resource as a light source for a flexible display device because it has the possibility of realizing full color, low power consumption, and fast response speed.

A current organic light emitting device requires an encapsulation barrier layer to protect the organic light emitting device from oxygen and moisture and a polarizer to maintain a high contrast ratio for outdoor readability.

However, when a polarizing plate having a hard property is applied, the flexibility of the flexible display device is reduced, and the light emitting layer of the organic light emitting device absorbs emitted light, reducing the luminance of the device and increasing the thickness.

On the other hand, if the polarizer is not applied, the external light is transmitted into the flexible display device and then reflected back out, mixing colors with light emitted from the original organic light emitting device, causing a problem in that the contrast ratio under the external light source is greatly reduced.

In addition, Korean Patent Registration No. 10-0398940 has prism structures of various heights included in a display device formed on the surface, and Korean Patent Publication No. 10-2002-0041819 discloses a prism having a variable angle structure formed on the surface. However, all of these did not show the effect of improving the contrast ratio as expected.

Republic of Korea Patent No. 10-0398940 Republic of Korea Patent Publication No. 10-2002-0041819

In the organic light emitting device, a polarizing plate may be used to solve the problem of lowering the contrast ratio and visibility due to reflection of external light.

The polarizing plate minimizes external reflection of the incident external light by absorbing external light incident on the organic light emitting device. However, the polarizing plate also absorbs light emitted from the light emitting layer of the organic light emitting device to reduce the luminance of the device, and the polarizing plate is additionally stacked on the organic light emitting device to increase the overall thickness.

Therefore, in order to solve the above problems,

An object of the present invention is to provide a blue photosensitive resin composition capable of minimizing external light reflection without using a polarizing plate in a display device.

In addition, an object of the present invention is to provide a blue photosensitive resin composition capable of implementing colors by limiting transmittance within a specific range.

In addition, an object of the present invention is to provide a blue color filter and a display device manufactured using the blue photosensitive resin composition.

In order to achieve the above purpose,

The present invention is a blue photosensitive resin composition comprising a blue colorant, an alkali-soluble resin, a photopolymerizable compound, a photopolymerization initiator and a solvent,

The blue colorant includes a blue pigment and a black pigment,

The blue photosensitive resin composition provides a blue photosensitive resin composition having a spectral transmittance of 60% or more and less than 75% at 425 to 480 nm and a spectral transmittance of more than 0% and less than 20% at 530 to 780 nm.

In addition, the present invention provides a blue color filter made of the blue photosensitive resin composition.

In addition, the present invention provides a display device including the blue color filter.

The blue photosensitive resin composition of the present invention has an effect of minimizing external light reflection without laminating a polarizing plate on an organic light emitting device.

In addition, the blue photosensitive resin composition of the present invention can implement a color by limiting the transmittance within a specific range.

In addition, the display device made of the blue photosensitive resin composition of the present invention has the advantage of being thin because the polarizer is not laminated.

1 to 3 are graphs showing the results of Experimental Example 1. In particular, FIG. 2 is a graph showing the spectral transmittance at 425 to 480 nm according to the results of Experimental Example 1, and FIG. 3 is a graph showing the spectral transmittance at 530 to 780nm according to the results of Experimental Example 1.

Hereinafter, the present invention will be described in more detail.

The present invention is a blue photosensitive resin composition comprising a blue colorant, an alkali-soluble resin, a photopolymerizable compound, a photopolymerization initiator and a solvent,

The blue colorant includes a blue pigment and a black pigment,

The blue photosensitive resin composition relates to a blue photosensitive resin composition having a spectral transmittance of 60% or more and less than 75% at 425 to 480 nm and a spectral transmittance of more than 0% and less than 20% at 530 to 780 nm.

In an organic light emitting device, a polarizing plate is used to solve the problem of lowering contrast ratio and visibility due to reflection of external light.

The polarizing plate minimizes external reflection of the incident external light by absorbing external light incident on the organic light emitting device. However, the polarizing plate also absorbs light emitted from the light emitting layer of the organic light emitting device to reduce the luminance of the device, and the polarizing plate is additionally stacked on the organic light emitting device to increase the overall thickness.

Accordingly, the present invention has attempted to provide a blue photosensitive resin composition capable of minimizing external light reflection without laminating a polarizing plate on an organic light emitting device in order to solve the above problems.

The blue photosensitive resin composition of the present invention has a spectral transmittance of 60% or more and less than 75% at 425 to 480 nm and a spectral transmittance of more than 0% and less than 20% at 530 to 780 nm, so that color can be implemented while minimizing reflection of external light.

Hereinafter, components of the blue photosensitive resin composition of the present invention will be described in detail.

(A) blue colorant

The blue colorant, which is one component of the blue photosensitive resin composition of the present invention, includes a blue pigment and a black pigment.

As the blue and black pigments, organic or inorganic pigments generally used in the art may be used. In addition, if necessary, the blue pigment and the black pigment may be subjected to resin treatment, surface treatment using a pigment derivative having an acidic group or basic group introduced therein, graft treatment of the pigment surface using a polymer compound, etc., atomization treatment by sulfuric acid atomization method, washing treatment with an organic solvent or water to remove impurities, or ionic impurity removal treatment by an ion exchange method.

Various pigments used in printing inks and inkjet inks may be used as the organic pigments, and specifically, water-soluble azo pigments, insoluble azo pigments, phthalocyanine pigments, quinacridone pigments, isoindolinone pigments, isoindoline pigments, perylene pigments, perinone pigments, dioxazine pigments, anthraquinone pigments, dianthraquinonyl pigments, anthrapyrimidine pigments, anthraquinone pigments, indanthrone pigments, pravanthrone pigments, and pyranthrones. A pigment, a diketopyrroropyrrole pigment, etc. are mentioned.

In addition, metal compounds such as metal oxides and metal complex salts can be used as the inorganic pigments, and specifically, metal oxides or composite metal oxides such as iron, cobalt, aluminum, cadmium, lead, copper, titanium, magnesium, chromium, zinc, antimony, carbon black, organic black pigments, titanium black, and pigments obtained by mixing blue, green, and red to show black.

In particular, the organic and inorganic pigments may specifically include compounds classified as pigments in the color index (published by The Society of Dyers and Colourists), and more specifically include pigments with color index (C.I.) numbers, but are not necessarily limited thereto.

The blue pigment is C.I. It is preferable to include at least one selected from the group consisting of Pigment Blue 15:3, 15:4, 15:6, 21, 28, 60, 64 and 76, and C.I. It is more preferable to include at least one selected from the group consisting of Pigment Blue 15:4 and 15:6.

The black pigment is a mixture of red, blue and green pigments, C.I. Pigment Black 1, C.I. It is preferable to include at least one selected from the group consisting of pigment black 7, carbon black, organic black, and titanium black.

More preferably, a colored dispersion obtained by mixing and milling carbon black and two or more colored pigments is used.

The carbon black is not particularly limited as long as it is a light-shielding pigment, and known carbon black can be used. Specific examples of the black pigment carbon black include channel black, furnace black, thermal black, and lamp black.

In addition, as a product of the carbon black, specifically, for example,

CHBK-17 from Mikuni Color Co.;

Donghae Carbon Co., Ltd.'s cisto 5HIISAFHS, cisto KH, cisto 3HHAF-HS, cisto NH, cisto 3M, cisto 300HAF-LS, cisto 116HMMAF-HS, cisto 116MAF, cisto FMFEF-HS, cisto SOFEF, cisto VGPF, cisto SVHSRF-HS and cisto SSRF;

Diagram Black Ⅱ, Diagram Black N339, Diagram Black SH, Diagram Black H, Diagram LH, Diagram HA, Diagram SF, Diagram N550M, Diagram M, Diagram E, Diagram G, Diagram R, Diagram N760M, Diagram LR, #2700, #2600, #2400, #2350, #2300, #2200, #1000, #980, #900, MCF88, #52, #50, #47, #45, #45L, #25, #CF9, #95, #3030, #3050, MA7, MA77, MA8, MA11, OIL7B, OIL9B, OIL11B, OIL30B and OIL31B;

Daegu PRINTEX-U, PRINTEX-V, PRINTEX-140U, PRINTEX-140V, PRINTEX-95, PRINTEX-85, PRINTEX-75, PRINTEX-55, PRINTEX-45, PRINTEX-300, PRINTEX-35, PRINTEX-25, PRINTEX-200, PRINTEX-40, PRINTEX-30, PRINTEX-3, PR INTEX-A, SPECIAL BLACK-550, SPECIAL BLACK-350, SPECIAL BLACK-250, SPECIAL BLACK-100 and LAMP BLACK-101;

RAVEN-1100ULTRA, RAVEN-1080ULTRA, RAVEN-1060ULTRA, RAVEN-1040, RAVEN-1035, RAVEN-1020, RAVEN-1000, RAVEN-890H, RAVEN-890, RAVEN-880ULTRA, RAVEN-860ULTRA, RAVEN-850, RAVE from Columbia Carbon Co., Ltd. N-820, RAVEN-790ULTRA, RAVEN-780ULTRA, RAVEN-760ULTRA, RAVEN-520, RAVEN-500, RAVEN-460, RAVEN-450, RAVEN-430ULTRA, RAVEN-420, RAVEN-410, RAVEN-2500ULTRA, RAVEN-2000, RAVEN-1500, RAVEN-1255, RAVEN-1250, RAVEN-1200, RAVEN-1190ULTRA, and RAVEN-1170.

In addition, the color pigments that can be mixed with the carbon black include Carmine 6B (C.I. 12490), Phthalocyanine Green (C.I. 74260), Phthalocyanine Blue (C.I. 74160), Mitsubishi Carbon Black MA100, Perylene Black (BASF K0084. K0086), Cyanine Black, Linol Yellow (C.I. 21090), and Linol Yellow G. RO (C.I. 21090), Benzidine Yellow 4T-564D, Mitsubishi Carbon Black MA-40, Victoria Pure Blue (C.I.42595), C.I. Pigment Red 97, 122, 149, 168, 177, 180, 192, 215, C.I. Pigment Green 7, 36, C.I. Pigment Blue 15:1, 15:4, 15:6, 22, 60, 64, C.I. Yellow Pigment 83, 139 C.I. Pigment Violet 23 and the like, and other white pigments and fluorescent pigments may also be used.

The blue pigment and the black pigment are preferably mixed in a weight ratio of 99.9:0.1 to 80:20, and more preferably mixed in a weight ratio of 99:1 to 95:1.

When the weight ratio of the blue pigment and the black pigment is out of 99.9:0.1 to 80:20, the blue photosensitive resin composition may have a spectral transmittance of 60% or more and less than 75% at 425 to 480 nm.

If the spectral transmittance is less than 60%, the external light reflection effect of the blue photosensitive resin composition is good, but the visibility due to the decrease in luminance is poor.

In addition, the blue colorant may further include a purple pigment. The color of the blue photosensitive resin composition can be adjusted by further including the purple pigment.

The purple pigment is C.I. It is preferable to include at least one selected from the group consisting of Pigment Violet 14, 19, 23, 29, 32, 33, 36, 37 and 38.

The purple pigment is included in 3 to 30% by weight, preferably 10 to 20% by weight, based on the total weight of the blue colorant.

The blue colorant is included in an amount of 10 to 80% by weight, preferably 10 to 40% by weight, more preferably 10 to 30% by weight based on the total weight of the solid content in the blue photosensitive resin composition of the present invention.

When the blue colorant is included in an amount of 10 to 80% by weight, the blue photosensitive resin composition has low viscosity, excellent storage stability, and high dispersion efficiency, which is effective in increasing the contrast ratio.

In the present invention, the total weight of solid content means the total weight of the remaining components excluding the solvent.

As the pigment, it is preferable to use a pigment dispersion in which the particle size of the pigment is uniformly dispersed. Examples of a method for uniformly dispersing the particle size of the pigment include a method of dispersing treatment by containing a pigment dispersant (a1), and according to the method, a pigment dispersion in which the pigment is uniformly dispersed in a solution can be obtained.

(a1) pigment dispersant

The pigment dispersant is added to maintain the deagglomeration and stability of the pigment, and specific examples of the pigment dispersant include surfactants such as cationic, anionic, nonionic, amphoteric, polyester, and polyamine surfactants. These may be used alone or in combination of two or more.

Specific examples of the cationic surfactant include amine salts or quaternary ammonium salts such as stearylamine hydrochloride and lauryltrimethylammonium chloride.

Specific examples of the anionic surfactant include higher alcohol sulfate ester salts such as sodium lauryl alcohol sulfate and sodium oleyl alcohol sulfate ester, alkyl sulfates such as sodium lauryl sulfate and ammonium lauryl sulfate, and alkylaryl sulfonates such as sodium dodecylbenzenesulfonate and sodium dodecylnaphthalenesulfonate.

Specific examples of the nonionic surfactant include polyoxyethylene alkyl ethers, polyoxyethylene aryl ethers, polyoxyethylene alkyl aryl ethers, other polyoxyethylene derivatives, oxyethylene/oxypropylene block copolymers, sorbitan fatty acid esters, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene sorbitol fatty acid esters, glycerin fatty acid esters, polyoxyethylene fatty acid esters, and polyoxyethylene alkylamines.

Other examples include polyoxyethylene alkyl ethers, polyoxyethylene alkyl phenyl ethers, polyethylene glycol diesters, sorbitan fatty acid esters, fatty acid-modified polyesters, tertiary amine-modified polyurethanes, and polyethyleneimines.

In addition, the pigment dispersant preferably includes an acrylate-based dispersant (hereinafter referred to as an acrylate-based dispersant) including butyl methacrylate (BMA) or N,N-dimethylaminoethyl methacrylate (DMAEMA). Commercial products of the acrylate-based dispersant include DISPER BYK-2000, DISPER BYK-2001, DISPER BYK-2070, or DISPER BYK-2150, and the acrylate-based dispersant may be used alone or in combination of two or more.

As the pigment dispersant, other resin-type pigment dispersants may be used in addition to the acrylate-based dispersant. The other resin-type pigment dispersants include known resin-type pigment dispersants, particularly polyurethane, polycarboxylic acid esters represented by polyacrylates, unsaturated polyamides, polycarboxylic acids, (partial) amine salts of polycarboxylic acids, ammonium salts of polycarboxylic acids, alkylamine salts of polycarboxylic acids, polysiloxanes, long-chain polyaminoamide phosphate salts, hydroxyl group-containing esters of polycarboxylic acids and their modified products, or free carboxyl oily dispersants such as amides formed by reaction of group-containing polyester with poly(lower alkyleneimine) or salts thereof; water-soluble resins or water-soluble polymer compounds such as (meth)acrylic acid-styrene copolymer, (meth)acrylic acid-(meth)acrylate ester copolymer, styrene-maleic acid copolymer, polyvinyl alcohol or polyvinyl pyrrolidone; Polyester; modified polyacrylate; adducts of ethylene oxide/propylene oxide; and phosphate esters.

Commercially available products of the other resin-type pigment dispersants include, for example, BYK (Big) Chemistry trade names: DISPER BYK-160, DISPER BYK-161, DISPER BYK-162, DISPER BYK-163, DISPER BYK-164, DISPER BYK-166, DISPER BYK-171, DISPER BYK-182, DISPER BYK. -184; BASF brand names: EFKA-44, EFKA-46, EFKA-47, EFKA-48, EFKA-4010, EFKA-4050, EFKA-4055, EFKA-4020, EFKA-4015, EFKA-4060, EFKA-4300, EFKA-4330, EFKA-4400, EFKA-4406 , EFKA-4510, EFKA-4800; Trade names of Lubirzol: SOLSPERS-24000, SOLSPERS-32550, NBZ-4204/10; Trade names of Kawaken Fine Chemical Co.: HINOACT T-6000, HINOACT T-7000, HINOACT T-8000; Trade names of Ajinomoto: AJISPUR PB-821, AJISPUR PB-822, AJISPUR PB-823; Trade names of Kyoeisha Chemical Co., Ltd.: FLORENE DOPA-17HF, FLORENE DOPA-15BHF, FLORENE DOPA-33, FLORENE DOPA-44 and the like.

In addition to the above acrylate-based dispersants, other resin-type pigment dispersants may be used alone or in combination of two or more, and may be used in combination with an acrylate-based dispersant.

The pigment dispersant is included in an amount of 5 to 60 parts by weight, preferably 15 to 50 parts by weight, based on 100 parts by weight of the solid content of the pigment. If the content of the pigment dispersant exceeds 60 parts by weight, the viscosity increases, and if it is less than 5 parts by weight, it may be difficult to atomize the pigment or cause problems such as gelation after dispersion.

(B) alkali soluble resin

The alkali-soluble resin, which is one of the blue photosensitive resin compositions of the present invention, must be soluble in the solvent of the blue photosensitive resin composition and have reactivity to the action of light or heat. In addition, as long as it functions as a binder resin for the colorant and is soluble in an alkaline developer, the type thereof may be used without particular limitation.

The alkali-soluble resin may be a copolymer of a monomer containing a carboxyl group and another monomer copolymerizable with the monomer.

The monomer containing a carboxyl group may be, for example, an unsaturated carboxylic acid such as an unsaturated polycarboxylic acid containing at least one carboxyl group in a molecule such as an unsaturated monocarboxylic acid, an unsaturated dicarboxylic acid, or an unsaturated tricarboxylic acid.

Specifically, the unsaturated monocarboxylic acid may be, for example, acrylic acid, methacrylic acid, crotonic acid, α-chloroacrylic acid, and cinnamic acid.

Specifically, the unsaturated dicarboxylic acid may be, for example, maleic acid, fumaric acid, itaconic acid, citraconic acid, and mesaconic acid.

The unsaturated polyhydric carboxylic acid may be an acid anhydride, such as maleic anhydride, itaconic anhydride, and citraconic anhydride.

The unsaturated polyhydric carboxylic acid may be a mono(2-methacryloyloxyalkyl) ester, specifically, monosuccinic acid (2-acryloyloxyethyl), monosuccinic acid (2-methacryloyloxyethyl), monophthalic acid (2-acryloyloxyethyl), and monophthalic acid (2-methacryloyloxyethyl).

The unsaturated polyhydric carboxylic acid may be a mono(meth)acrylate of a dicarboxy polymer at both ends, and specifically may be ω-carboxypolycaprolactone monoacrylate and ω-carboxypolycaprolactone monomethacrylate.

The monomers containing the carboxyl group may be used individually or in combination of two or more.

Other monomers copolymerizable with the monomer containing the carboxyl group include, for example, styrene, α-methylstyrene, o-vinyltoluene, m-vinyltoluene, p-vinyltoluene, p-chlorostyrene, o-methoxystyrene, m-methoxystyrene, p-methoxystyrene, o-vinylbenzylmethylether, m-vinylbenzylmethylether, p-vinylbenzylmethylether, o-vinyl aromatic vinyl compounds such as benzyl glycidyl ether, m-vinylbenzyl glycidyl ether, p-vinylbenzyl glycidyl ether and indene;

Methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, n-propyl acrylate, n-propyl methacrylate, i-propyl acrylate, i-propyl methacrylate, n-butyl acrylate, n-butyl methacrylate, i-butyl acrylate, i-butyl methacrylate, sec-butyl acrylate, sec-butyl methacrylate, t-butyl acrylate, t-butyl methacrylate, 2-hydroxy hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl acrylate, 2-hydroxypropyl methacrylate, 3-hydroxypropyl acrylate, 3-hydroxypropyl methacrylate, 2-hydroxybutyl acrylate, 2-hydroxybutyl methacrylate, 3-hydroxybutyl acrylate, 3-hydroxybutyl methacrylate, 4-hydroxybutyl acrylate, 4-hydroxybutyl methacrylate, Al Lyl acrylate, allyl methacrylate, benzyl acrylate, benzyl methacrylate, cyclohexyl acrylate, cyclohexyl methacrylate, phenyl acrylate, phenyl methacrylate, 2-methoxyethyl acrylate, 2-methoxyethyl methacrylate, 2-phenoxyethyl acrylate, 2-phenoxyethyl methacrylate, methoxydiethylene glycol acrylate, methoxydiethylene glycol methacrylate , Methoxytriethylene glycol acrylate, methoxytriethylene glycol methacrylate, methoxypropylene glycol acrylate, methoxy propylene glycol methacrylate, methoxy dipropylene glycol acrylate, methoxy dipropylene glycol methacrylate, isobornyl acrylate, isobornyl methacrylate, dicyclopentadienyl acrylate, dicyclopentadienyl methacrylate, 2-hydroxy-3-phenoxypropyl acrylate, unsaturated carboxylic acid esters such as 2-hydroxy-3-phenoxypropyl methacrylate, glycerol monoacrylate and glycerol monomethacrylate;

2-aminoethyl acrylate, 2-aminoethyl methacrylate, 2-dimethylaminoethyl acrylate, 2-dimethylaminoethyl methacrylate, 2-aminopropyl acrylate, 2-aminopropyl methacrylate, 2-dimethylaminopropyl acrylate, 2-dimethylaminopropyl methacrylate, 3-aminopropyl acrylate, 3-aminopropyl methacrylate, 3-dimethylaminopropyl acrylate and 3-dimethylaminopropyl methacrylate unsaturated carboxylic acid aminoalkyl esters such as acrylate;

unsaturated carboxylic acid glycidyl esters such as glycidyl acrylate and glycidyl methacrylate;

carboxylic acid vinyl esters such as vinyl acetate, vinyl propionate, vinyl butyrate and vinyl benzoate;

unsaturated ethers such as vinyl methyl ether, vinyl ethyl ether and allyl glycidyl ether;

vinyl cyanide compounds such as acrylonitrile, methacrylonitrile, α-chloroacrylonitrile, and vinylidene cyanide;

unsaturated amides such as acrylamide, methacrylamide, α-chloroacrylamide, N-2-hydroxyethylacrylamide and N-2-hydroxyethylmethacrylamide;

unsaturated imides such as maleimide, N-phenylmaleimide and N-cyclohexylmaleimide;

aliphatic conjugated dienes such as 1,3-butadiene, isoprene and chloroprene; and

macromonomers having a monoacryloyl group or a monomethacryloyl group at the terminal of the polymer molecular chain of polystyrene, polymethyl acrylate, polymethyl methacrylate, poly-n-butyl acrylate, poly-n-butyl methacrylate, and polysiloxane; etc. can be mentioned. These monomers may be used alone or in combination of two or more.

That is, the alkali-soluble resin is, for example, (meth) acrylic acid / methyl (meth) acrylate copolymer, (meth) acrylic acid / benzyl (meth) acrylate copolymer, (meth) acrylic acid / 2-hydroxyethyl (meth) acrylate / benzyl (meth) acrylate copolymer, (meth) acrylic acid / methyl (meth) acrylate / polystyrene macromonomer copolymer, (meth) acrylic acid / methyl (meth) acrylate / polymethyl (meth) acrylate Macromonomer copolymer, (meth)acrylic acid/benzyl(meth)acrylate/polystyrene macromonomer copolymer, (meth)acrylic acid/benzyl(meth)acrylate/polymethyl(meth)acrylate macromonomer copolymer, (meth)acrylic acid/2-hydroxyethyl(meth)acrylate/benzyl(meth)acrylate/polystyrene macromonomer copolymer, (meth)acrylic acid/2-hydroxyethyl(meth)acrylate/benzyl(meth)acrylate/ Polymethyl(meth)acrylate macromonomer copolymer, (meth)acrylic acid/styrene/benzyl(meth)acrylate/N-phenylmaleimide copolymer, (meth)acrylic acid/mono(2-acryloyloxy)succinate/styrene/benzyl(meth)acrylate/N-phenylmaleimide copolymer, (meth)acrylic acid/mono(2-acryloyloxyethyl) succinate/styrene/allyl(meth)acrylate/N-phenylmal Reimide copolymers and (meth)acrylic acid/benzyl (meth)acrylate/N-phenylmaleimide/styrene/glycerol mono(meth)acrylate copolymers may be used. The (meth)acrylate means acrylate or methacrylate.

In addition, the alkali-soluble resin is (meth) acrylic acid / benzyl (meth) acrylate copolymer, (meth) acrylic acid / benzyl (meth) acrylate / styrene copolymer, (meth) acrylic acid / methyl (meth) acrylate copolymer and (meth) acrylic acid / methyl (meth) acrylate / styrene copolymer is preferred.

In addition, the alkali-soluble resin should have a weight average molecular weight in terms of polystyrene measured by gel permeation chromatography (GPC) using tetrahydrofuran as an eluting solvent, preferably 8,000 to 40,000, and more preferably 10,000 to 30,000.

When the weight average molecular weight of the alkali-soluble resin is 5,000 to 50,000, the coating film hardness is improved, exhibits an excellent film remaining rate, and can exhibit good solubility in the developing solution and improved resolution of the unexposed area.

In addition, the acid value of the alkali-soluble resin is 50 to 150 (mgKOH / g), preferably 60 to 140, more preferably 80 to 130.

Within the acid value range of 50 to 150, the solubility of the alkali-soluble resin in the developing solution is improved, so that the unexposed portion is easily dissolved and highly sensitive, so that the pattern of the exposed portion remains during development to improve the remaining film rate.

In addition, the alkali-soluble resin is included in 5 to 80% by weight, preferably 10 to 60% by weight based on the total weight of the solid content in the blue photosensitive resin composition of the present invention. If the alkali-soluble resin is out of the range of 5 to 80% by weight, the remaining film rate and reliability may be reduced, and pattern formation may not be easy.

(C) photopolymerization compound

The photopolymerizable compound, which is one of the blue photosensitive resin compositions of the present invention, must be a compound that can be polymerized by the action of a photopolymerization initiator (D) described later.

As the photopolymerizable compound, a monofunctional monomer, a bifunctional monomer, or a multifunctional monomer may be used, and a bifunctional monomer is preferably used, but is not limited thereto.

Specific examples of the monofunctional monomer include, but are not limited to, nonylphenylcarbitol acrylate, 2-hydroxy-3-phenoxypropyl acrylate, 2-ethylhexylcarbitol acrylate, 2-hydroxyethyl acrylate, or N-vinylpyrrolidone.

Specific examples of the bifunctional monomer include, but are not limited to, 1,6-hexanedioldi(meth)acrylate, ethylene glycoldi(meth)acrylate, neopentylglycoldi(meth)acrylate, triethylene glycoldi(meth)acrylate, bis(acryloyloxyethyl)ether of bisphenol A or 3-methylpentanedioldi(meth)acrylate.

Specific examples of the multifunctional monomer include trimethylolpropane tri(meth)acrylate, ethoxylated trimethylolpropane tri(meth)acrylate, propoxylated trimethylolpropane tri(meth)acrylate, pentaerythritol tri(meth)acrylate, pentaerythritol tetra(meth)acrylate, dipentaerythritol penta(meth)acrylate, ethoxylated dipentaerythritol hexa(meth)acrylate, Other) acrylate, propoxylated dipentaerythritol hexa (meth) acrylate or dipentaerythritol hexa (meth) acrylate, but is not limited thereto.

The photopolymerizable compound is included in 5 to 50% by weight, preferably 7 to 45% by weight, based on the total weight of the blue photosensitive resin composition of the present invention. The photopolymerizable compound can improve the strength and reliability of the pixel unit in the range of 5 to 50% by weight.

(D) light polymerization initiator

The photopolymerization initiator, which is one of the blue photosensitive resin compositions of the present invention, can be used without particular limitation as long as it can polymerize the above-described photopolymerizable compound (C).

In particular, the photopolymerization initiator is selected from the group consisting of acetophenone-based compounds, benzophenone-based compounds, triazine-based compounds, biimidazole-based compounds, oxime compounds, and thioxanthone-based compounds in view of polymerization characteristics, initiation efficiency, absorption wavelength, availability, price, etc. It is preferable to use at least one compound selected from the group consisting of.

The acetophenone-based compound is specifically, for example, diethoxyacetophenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, benzyldimethylketal, 2-hydroxy-1-[4-(2-hydroxyethoxy)phenyl]-2-methylpropan-1-one, 1-hydroxycyclohexylphenylketone, 2-methyl-1-(4-methylthiophenyl)-2-morpholinopropan-1 -one, 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl)butan-1-one, 2-hydroxy-2-methyl-1-[4-(1-methylvinyl)phenyl]propan-1-one, and 2-(4-methylbenzyl)-2-(dimethylamino)-1-(4-morpholinophenyl)butan-1-one.

Specific examples of the benzophenone-based compound include benzophenone, methyl 0-benzoylbenzoate, 4-phenylbenzophenone, 4-benzoyl-4'-methyldiphenylsulfide, 3,3',4,4'-tetra (tert-butylperoxycarbonyl) benzophenone and 2,4,6-trimethylbenzophenone.

The triazine-based compound is specifically, for example, 2,4-bis(trichloromethyl)-6-(4-methoxyphenyl)-1,3,5-triazine, 2,4-bis(trichloromethyl)-6-(4-methoxynaphthyl)-1,3,5-triazine, 2,4-bis(trichloromethyl)-6-piperonyl-1,3,5-triazine, 2,4-bis(trichloromethyl)- 6-(4-methoxystyryl)-1,3,5-triazine, 2,4-bis(trichloromethyl)-6-[2-(5-methylfuran-2-yl)ethenyl]-1,3,5-triazine, 2,4-bis(trichloromethyl)-6-[2-(furan-2-yl)ethenyl]-1,3,5-triazine, 2,4-bis(trichloromethyl)-6-[2-( 4-diethylamino-2-methylphenyl)ethenyl]-1,3,5-triazine and 2,4-bis(trichloromethyl)-6-[2-(3,4-dimethoxyphenyl)ethenyl]-1,3,5-triazine; and the like.

The biimidazole compound is specifically, for example, 2,2'-bis(2-chlorophenyl)-4,4',5,5'-tetraphenylbiimidazole, 2,2'-bis(2,3-dichlorophenyl)-4,4',5,5'-tetraphenylbiimidazole, 2,2'-bis(2-chlorophenyl)-4,4',5,5'-tetra(alkoxyphenyl)biimidazole, 2,2'-bis(2-chlorophenyl)-4,4',5,5'-tetra(trialkoxyphenyl)biimidazole, 2,2-bis(2,6-dichlorophenyl)-4,4',5,5'-tetraphenyl-1,2'-biimidazole, and imidazole compounds in which the phenyl group at the 4,4',5,5' position is substituted with a carboalkoxy group. Among these, 2,2'-bis(2-chlorophenyl)-4,4',5,5'-tetraphenylbiimidazole, 2,2'-bis(2,3-dichlorophenyl)-4,4',5,5'-tetraphenylbiimidazole and 2,2-bis(2,6-dichlorophenyl)-4,4',5,5'-tetraphenyl-1,2'-biimidazole are preferably used.

Specifically as the oxime ester compound, for example, 1,2-octadione (1,2-Octanedione), 1-[4-(phenylthio)phenyl]-,2-(O-benzoyloxime)(1-[4-(phenylthio)phenyl]-,2-(O-benzoyloxime)) and 1-[9-ethyl-6-(2-methylbenzoyl)-9H-carbazol-3-yl]ethanone 1- (O-acetyloxime) (1-[9-Ethyl-6-(2-methylbenzoyl)-9H-carbazol-3-yl]ethanone 1-(O-acetyloxime)), and commercially available oxime ester compounds include BASF's Irgacure® OXE 01, Irgacure® OXE 02, and Irgacure® OXE 03.

Specific examples of the thioxanthone-based compound include 2-isopropylthioxanthone, 2,4-diethylthioxanthone, 2,4-dichlorothioxanthone, 1-chloro-4-propoxythioxanthone, and the like.

In addition, the photopolymerization initiator may further include a photopolymerization initiator (d1) in order to improve the sensitivity of the blue photosensitive resin composition of the present invention. By containing the photopolymerization initiation auxiliary agent (d1), the blue photosensitive resin composition according to the present invention can further increase sensitivity and improve productivity.

As the photopolymerization initiation aid, for example, at least one compound selected from the group consisting of an amine compound, a carboxylic acid compound, and an organic sulfur compound having a thiol group may be preferably used.

It is preferable to use an aromatic amine compound as the amine compound, specifically, for example, aliphatic amine compounds such as triethanolamine, methyldiethanolamine and triisopropanolamine; methyl 4-dimethylaminobenzoate, ethyl 4-dimethylaminobenzoate, isoamyl 4-dimethylaminobenzoate, 2-ethylhexyl 4-dimethylaminobenzoate, 2-dimethylaminoethyl benzoate, N,N-dimethylparatoluidine, 4,4'-bis(dimethylamino)benzophenone (common name: Michler's ketone), 4,4'-bis(diethylamino)benzophenone, and the like can be used.

It is preferable to use aromatic heteroacetic acids as the carboxylic acid compound, specifically, for example, phenylthioacetic acid, methylphenylthioacetic acid, ethylphenylthioacetic acid, methylethylphenylthioacetic acid, dimethylphenylthioacetic acid, methoxyphenylthioacetic acid, dimethoxyphenylthioacetic acid, chlorophenylthioacetic acid, dichlorophenylthioacetic acid, N-phenylglycine, phenoxyacetic acid, naphthylthioacetic acid, N-naphthylglycine and naphthoxyacetic acid. etc. can be mentioned.

The organic sulfur compound having a thiol group is specifically, for example, 2-mercaptobenzothiazole, 1,4-bis (3-mercaptobutyryloxy) butane, 1,3,5-tris (3-mercaptobutyloxyethyl) -1,3,5-triazine-2,4,6 (1H, 3H, 5H) -trione, trimethylolpropanetris (3-mercaptopropionate), pentaerythritol te Trakis(3-mercaptobutyrate), pentaerythritol tetrakis(3-mercaptopropionate), dipentaerythritol hexakis(3-mercaptopropionate), tetraethylene glycol bis(3-mercaptopropionate), etc. are mentioned.

The photopolymerization initiator may be included in an amount of 0.1 to 40% by weight, preferably 1 to 30% by weight, based on the total weight of solids in the blue photosensitive resin composition of the present invention.

When the photopolymerization initiator is included in an amount of 0.1 to 40% by weight, the blue photosensitive resin composition is highly sensitive and the exposure time is shortened, thereby improving productivity and maintaining high resolution. In addition, the intensity of the pixel portion and the smoothness of the surface of the pixel portion may be improved.

also. The photopolymerization initiation aid is included in an amount of 10 to 100% by weight, preferably 20 to 100% by weight, based on the total weight of the photopolymerization initiator.

When the photopolymerization initiation aid is included in an amount of less than 10% by weight, the decrease in sensitivity due to the dye cannot be overcome, and the short circuit of the pattern is likely to occur during the developing process.

(E) Solvent

As long as the solvent is effective in dissolving other components included in the blue photosensitive resin composition, solvents used in conventional blue photosensitive resin compositions may be used without particular limitation, and in particular, ethers, acetates, aromatic hydrocarbons, ketones, alcohols, esters or amides are preferred.

Examples of the ethers include ethylene glycol monoalkyl ethers such as ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monopropyl ether, and ethylene glycol monobutyl ether;

Diethylene glycol dialkyl ethers, such as diethylene glycol dimethyl ether, diethylene glycol diethyl ether, diethylene glycol dipropyl ether, and diethylene glycol dibutyl ether, etc. are mentioned.

Examples of the acetates include methyl cellosolve acetate, ethyl cellosolve acetate, ethyl acetate, butyl acetate, amyl acetate, methyl lactate, ethyl lactate, butyl lactate, 3-methoxybutyl acetate, 3-methyl-3-methoxy-1-butyl acetate, methoxypentyl acetate, ethylene glycol monoacetate, ethylene glycol diacetate, methyl 3-methoxypropionate, propylene glycol methyl ether acetate, 3-methoxy-1-butyl acetate, 1,2-propylene glycol diacetate, ethylene glycol monobutyl ether acetate, diethylene glycol monoethyl ether acetate, dipropylene glycol methyl ether acetate, 1,3-butylene glycol diacetate, diethylene glycol monobutyl ether acetate, ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate, diethylene glycol monoacetate, diethylene glycol diacetate, diethylene glycol monobutyl ether acetate, propylene glycol monoacetate, propylene glycol diacetate, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, ethylene carbonate, and propylene carbonate.

Examples of the aromatic hydrocarbons include benzene, toluene, xylene and mesitylene.

Examples of the ketones include methyl ethyl ketone, acetone, methyl amyl ketone, methyl isobutyl ketone and cyclohexanone.

Examples of the alcohols include ethanol, propanol, butanol, hexanol, cyclohexanol, ethylene glycol, glycerin, and 4-hydroxy-4-methyl-2-pentanone.

Examples of the esters include ethyl 3-ethoxypropionate, methyl 3-methoxypropionate, and γ-butyrolactone.

Examples of the amides include dimethylformamide (DMF) and N-methyl-2-pyrilidone (NMP).

These solvents may be used alone or in combination of two or more.

As the solvent, it is preferable to use an organic solvent having a boiling point of 100° C. to 200° C. in terms of coating properties and drying properties, and examples thereof include propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, cyclohexanone, ethyl lactate, butyl lactate, 3-ethoxyethylpropionate, and 3-methoxymethylpropionate.

The solvent is included in an amount of 25 to 80% by weight, preferably 30 to 70% by weight, based on the total weight of the blue photosensitive resin composition. When the solvent is included in the range of 25 to 80% by weight, the coating property can be improved when applied with a coating device such as a roll coater, a spin coater, a slit and spin coater, a slit coater (sometimes referred to as a die coater), and an inkjet.

(F) Additives

The additive may be selectively added as needed, and may include, for example, at least one selected from the group consisting of a filler, another polymer compound, a curing agent, a surfactant, an adhesion accelerator, an ultraviolet absorber, and an aggregation inhibitor.

Glass or alumina may be used as the filler, but the type is not limited.

Specific examples of the other polymer compounds include curable resins such as epoxy resins and maleimide resins, thermoplastic resins such as polyvinyl alcohol, polyacrylic acid, polyethylene glycol monoalkyl ether, polyfluoroalkyl acrylate, polyester and polyurethane.

The curing agent is used for deep curing and increasing mechanical strength, and specific examples of the curing agent include an epoxy compound, a polyfunctional isocyanate compound, a melamine compound, and an oxetane compound.

Specific examples of the epoxy compound in the curing agent include bisphenol A epoxy resins, hydrogenated bisphenol A epoxy resins, bisphenol F epoxy resins, hydrogenated bisphenol F epoxy resins, noblock type epoxy resins, other aromatic epoxy resins, alicyclic epoxy resins, glycidyl ester resins, glycidylamine resins, brominated derivatives of the above epoxy resins, aliphatic, alicyclic or aromatic epoxy compounds other than epoxy resins and their brominated derivatives, butadiene (void) polymer epoxides, isoprene (co)polymer epoxides, glycidyl (meth)acrylate (co)polymers, and triglycidyl isocyanurate; and the like.

Specific examples of the oxetane compound in the curing agent include carbonate bisoxetane, xylene bisoxetane, adipate bisoxetane, terephthalate bisoxetane, and cyclohexanedicarboxylic acid bisoxetane.

The curing agent may be used in combination with a curing auxiliary compound capable of ring-opening polymerization of an epoxy group of an epoxy compound and an oxetane skeleton of an oxetane compound together with the curing agent.

Examples of the curing auxiliary compound include polyvalent carboxylic acids, polyvalent carboxylic acid anhydrides, and acid generators. The polyhydric carboxylic acid anhydrides may be commercially available as epoxy resin curing agents. Examples of commercially available products include Adekahadona EH-700 (manufactured by Adeka Kogyo Co., Ltd.), Ricasiddo HH (manufactured by Nippon Ewha Co., Ltd.), and MH-700 (manufactured by Shinnippon Ewha Co., Ltd.). The curing agents exemplified above may be used alone or in combination of two or more.

The surfactant can be used to further improve the film formation of the blue photosensitive resin composition, and silicone-based, fluorine-based, ester-based, cationic, anionic, nonionic, amphoteric surfactants and the like can be preferably used.

The silicone-based surfactants include, for example, DC3PA, DC7PA, SH11PA, SH21PA, and SH8400 of Dow Corning Toray Silicon as commercial products, and TSF-4440, TSF-4300, TSF-4445, TSF-4446, TSF-4460, and TSF-4452 of GE Toshiba Silicone.

Examples of the fluorine-based surfactant include Megapiece F-470, F-471, F-475, F-482, and F-489 manufactured by Dainippon Ink & Chemicals Kogyo Co., Ltd. as commercial products.

In addition, other available commercial products include KP (Shin-Etsu Kagaku Kogyo Co., Ltd.), POLYFLOW (Kyoeisha Kagaku Co., Ltd.), EFTOP (Tochem Products Co., Ltd.), MEGAFAC (Dinippon Ink Kagaku Kogyo Co., Ltd.), Flourad (Sumitomo 3M Co., Ltd.), Asahi Guard, and Surflon. ) (above, Asahi Glass Co., Ltd.), SOLSPERSE (Lubrisol), EFKA (EFKA Chemicals Co., Ltd.), PB 821 (Ajinomoto Co., Ltd.), and Disperbyk-series (BYK-chemi).

The surfactants exemplified above may be used alone or in combination of two or more, respectively.

The type of adhesion promoter is not particularly limited, and specific examples of usable adhesion promoters include vinyltrimethoxysilane, vinyltriethoxysilane, vinyltris(2-methoxyethoxy)silane, N-(2-aminoethyl)-3-aminopropylmethyldimethoxysilane, N-(2-aminoethyl)-3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-glycidoxypropyltrimethoxysilane, and 3-glycidyl. cidoxypropylmethyldimethoxysilane, 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, 3-chloropropylmethyldimethoxysilane, 3-chloropropyltrimethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-mercaptopropyltrimethoxysilane, 3-isocyanatepropyltrimethoxysilane, and 3-isocyanatepropyltriethoxysilane. there is

The adhesion promoters exemplified above may be used alone or in combination of two or more. The adhesion promoter may be included in an amount of usually 0.01 to 10% by weight, preferably 0.05 to 2% by weight, based on the total weight of the solid content in the blue photosensitive resin composition.

The type of the ultraviolet absorber is not particularly limited, but specific examples that can be used include 2-(3-tert-butyl-2-hydroxy-5-methylphenyl)-5-chlorobenzotyriazole, alkoxybenzophenone, and the like.

The type of the aggregation inhibitor is not particularly limited, but specific examples that can be used include sodium polyacrylate and the like.

The manufacturing method of the blue photosensitive resin composition of this invention is as follows.

First, the blue colorant (A) is mixed with the solvent (E) and dispersed using a bead mill or the like until the average particle diameter of the pigment is about 0.2 μm or less. At this time, if necessary, part or all of the pigment dispersant (a1) and the alkali-soluble resin (B) may be mixed with the solvent (E) to be dissolved or dispersed.

The blue photosensitive resin composition according to the present invention can be prepared by further adding the remainder of the alkali-soluble resin (B), the photopolymerizable compound (C), the photopolymerization initiator (D) and, if necessary, the additive (F) and the solvent (E) to a predetermined concentration to the mixed colored material.

In addition, the present invention provides a color filter made of a blue photosensitive resin composition and a display device having the same.

In one embodiment, the display device may be an organic light emitting device.

In another embodiment, the display device may be a flexible display device.

First, a blue photosensitive resin composition is applied onto a substrate (usually glass) or a layer made of solids of the previously formed blue photosensitive resin composition, and then heated and dried to remove volatile components such as a solvent to obtain a smooth coating film.

As the coating method, for example, spin coating, casting coating, roll coating, slit and spin coating, or slit coating may be used. After application, heat drying (prebaking) or drying under reduced pressure is followed by heating to volatilize volatile components such as solvents. Here, the heating temperature is usually 70 to 200°C, preferably 80 to 130°C. The coating film thickness after heat drying is usually about 1 to 8 μm. The coating film obtained in this way is irradiated with ultraviolet rays through a mask for forming a target pattern. At this time, it is preferable to use a device such as a mask aligner or a stepper so that parallel light rays are uniformly irradiated to the entire exposure area and accurate positioning of the mask and the substrate is performed. When irradiated with ultraviolet rays, the portion irradiated with ultraviolet rays is cured.

As the ultraviolet rays, g-rays (wavelength: 436 nm), h-rays, i-rays (wavelength: 365 nm), and the like may be used. The irradiation amount of ultraviolet rays can be appropriately selected as needed, and is not limited thereto in the present invention. When the cured coating film is brought into contact with a developer to dissolve the unexposed portion and developed, a spacer having a desired pattern shape can be obtained.

The developing method is not particularly limited to a liquid addition method, a dipping method, a spray method, or the like. Further, the substrate may be tilted at an arbitrary angle during development. The developing solution is usually an aqueous solution containing an alkaline compound and a surfactant.

The alkaline compound is not particularly limited to an inorganic or organic alkaline compound. Examples of the inorganic alkaline compound include sodium hydroxide, potassium hydroxide, disodium hydrogen phosphate, sodium dihydrogen phosphate, diammonium hydrogen phosphate, ammonium dihydrogen phosphate, potassium dihydrogen phosphate, sodium silicate, potassium silicate, sodium carbonate, potassium carbonate, sodium hydrogen carbonate, potassium hydrogen carbonate, sodium borate, potassium borate and ammonia.

Examples of the organic alkaline compound include tetramethylammonium hydroxide, 2-hydroxyethyltrimethylammonium hydroxide, monomethylamine, dimethylamine, trimethylamine, monoethylamine, diethylamine, triethylamine, monoisopropylamine, diisopropylamine, and ethanolamine.

These inorganic or organic alkaline compounds may be used alone or in combination of two or more. The concentration of the alkaline compound in the developer is 0.01 to 10% by weight, preferably 0.03 to 5% by weight, based on the total weight of the developer.

As the surfactant in the developing solution, at least one selected from the group consisting of the aforementioned nonionic surfactants, anionic surfactants, and cationic surfactants may be used. The concentration of the surfactant in the developer is 0.01 to 10% by weight, preferably 0.05 to 8% by weight, more preferably 0.1 to 5% by weight, based on the total weight of the developer. After development, it is washed with water, and if necessary, post-baking at 150 to 230°C for 10 to 60 minutes may be performed.

Using the blue photosensitive resin composition of the present invention, a specific pattern can be formed on a substrate through the above steps.

Hereinafter, examples will be described in detail to explain the present invention in detail. However, the embodiments according to the present invention can be modified in many different forms, and the scope of the present invention should not be construed as being limited to the embodiments described below. The embodiments of the present invention are provided to more completely explain the present invention to those skilled in the art.

synthesis example 1. Alkali-soluble resin synthesis

120 parts by weight of propylene glycol monomethyl ether acetate, 80 parts by weight of propylene glycol monomethyl ether, 2 parts by weight of AIBN, 13 parts by weight of acrylic acid, 10 parts by weight of benzyl methacrylate, 57 parts by weight of styrene, 20 parts by weight of methyl methacrylate and n-dodecylmercapto 3 parts by weight were introduced and nitrogen substitution was performed. Thereafter, while stirring, the temperature of the reaction solution was raised to 110° C., and then reacted for 6 hours.

The solid acid value of the alkali-soluble resin thus prepared was 100.2 mgKOH/g, and the weight average molecular weight Mw measured by GPC was about 15110.

<Preparation of blue photosensitive resin composition>

Example 1 to 6 and comparative example 1 to 2.

Blue photosensitive resin compositions of Examples 1 to 6 and Comparative Examples 1 to 2 were prepared according to the compositions shown in Table 1 below.

[Table 1] (unit: parts by weight)

(A-1) Blue Pigment: C.I. Pigment Blue 15:6

(A-2) blue pigment: C.I. Pigment Blue 15:4

(A-3) purple pigment: C.I. Pigment Violet 23

(A-4) Black pigment: PBk7: Carbon-black (MA-8, Mitsubishi Corporation)

(B) Alkali-soluble resin: Alkali-soluble resin prepared in Synthesis Example 1

(C) photopolymerizable compound: dipentaerythritol hexaacrylate (KAYARD DPHA; manufactured by Nippon Kayaku Co., Ltd.)

(D) Photopolymerization initiator: 2-O-benzoyloxime-1-[4-(phenylthio)phenyl]-1,2-octanedione (OXE-01; manufactured by BASF)

(E) solvent: propylene glycol monomethyl ether acetate

Experimental example 1. Color filter preparation and spectral transmittance measurement

The blue photosensitive resin compositions of Examples 1 to 6 and Comparative Examples 1 to 2 were applied on a 2-inch glass substrate ("EAGLE XG, manufactured by Corning) by spin coating, respectively, and then placed on a heating plate and maintained at a temperature of 100 ° C. for 3 minutes to form a thin film.

Thereafter, a test photomask having a 3X3cm exposed portion pattern and a pattern for changing the transmittance stepwise in the range of 1 to 100% was placed on the thin film, and ultraviolet rays were irradiated at an interval of 100 μm from the test photomask. At this time, ultraviolet rays were irradiated with an illuminance of 100 mJ/cm 2 using a 1 kW high-pressure mercury lamp containing all g, h, and i lines, and no special optical filter was used.

The UV-irradiated thin film was developed by immersing it in a KOH aqueous solution of pH 10.5 for 2 minutes. Thereafter, the glass plate coated with the thin film was washed with distilled water, dried by blowing nitrogen gas, and heated in a heating oven at 200° C. for 25 minutes to prepare each color filter.

The obtained film thickness was 3 μm, and the film thickness was measured using a film thickness measuring device (DEKTAK 6M; manufactured by Veeco).

For the color filters of Examples 1 to 6 and Comparative Examples 1 to 2 prepared above, spectral transmittance in the visible light region in the range of 380 nm to 780 nm was obtained using a colorimeter (OSP-200, manufactured by Olympus). The results are shown in Tables 2 and 3, and FIGS. 1 to 3.

[Table 2]

[Table 3]

Examples 1 to 6, which are blue photosensitive resin compositions of the present invention including a blue pigment and a black pigment, have a spectral transmittance of 60% or more and less than 75% at 425 to 480 nm, and a spectral transmittance of more than 0% and less than 20% at 530 to 780 nm.

On the other hand, Comparative Examples 1 and 2, which did not contain the black pigment, showed transmittance of up to 82% at 425 nm to 480 nm.

Therefore, it was found that the blue photosensitive resin composition of the present invention had a spectral transmittance of 60% or more and less than 75% at 425 to 480 nm and a spectral transmittance of more than 0% and less than 20% at 530 to 780 nm, thereby minimizing reflection of external light and displaying an effect capable of implementing color.

In addition, a color filter can be prepared using the blue photosensitive resin composition of the present invention and provided to a display display device including the color filter, and since the display device does not need to use a polarizing plate, the thickness of the display device can be reduced.

Claims (12)

A blue photosensitive resin composition comprising a blue colorant, an alkali-soluble resin, a photopolymerizable compound, a photopolymerization initiator and a solvent,
The blue colorant includes a blue pigment, a purple pigment and a black pigment,
The blue pigment and the black pigment are mixed in a weight ratio of 99.9:0.1 to 80:20,
The cured film prepared from the blue photosensitive resin composition has a spectral transmittance of 60% or more and less than 75% at 425 to 480 nm, and a spectral transmittance of more than 0% and less than 20% at 530 to 780 nm, a blue photosensitive resin composition for a color filter that does not contain a polarizing plate. delete delete The blue photosensitive resin composition according to claim 1, wherein the purple pigment is included in an amount of 3 to 30% by weight based on the total weight of the blue colorant. The method according to claim 1, wherein the blue pigment is C.I. A blue photosensitive resin composition comprising at least one selected from the group consisting of Pigment Blue 15:3, 15:4, 15:6, 21, 28, 60, 64 and 76. The method according to claim 1, wherein the black pigment is a mixture of red, blue and green pigment, C.I. Pigment Black 1, C.I. A blue photosensitive resin composition comprising at least one selected from the group consisting of pigment black 7, carbon black, organic black and titanium black. The method according to claim 1, wherein the purple pigment is C.I. A blue photosensitive resin composition comprising at least one selected from the group consisting of Pigment Violet 14, 19, 23, 29, 32, 33, 36, 37 and 38. The blue photosensitive resin composition according to claim 1, comprising 10 to 80% by weight of a blue colorant, 5 to 80% by weight of an alkali-soluble resin, 5 to 50% by weight of a photopolymerizable compound, and 0.1 to 40% by weight of a photopolymerization initiator, based on the total weight of solids in the blue photosensitive resin composition, and 25 to 80% by weight of a solvent based on the total weight of the blue photosensitive resin composition. A blue color filter made of the blue photosensitive resin composition of claim 1 and not including a polarizing plate. A display device comprising the blue color filter of claim 9. The method of claim 10,
Characterized in that the display element is a flexible display element, the display element. delete