KR101479475B1 - Processes for producing color filter and for producing liquid-crystal display - Google Patents

Abstract

The present invention provides a method of manufacturing a color filter capable of imparting high color purity and color reproducibility using inkjet ink excellent in straightness and stability when ejected from a head, and a liquid crystal display device using the color filter manufactured by the above method .
Transparency A pigment dispersion is selectively applied to the gap between the boundaries on the insulating substrate by an inkjet method (pigment dispersion coating step), and then a transparent resin solution is selectively applied to the gap in the boundary by an inkjet method, And a transparent resin solution are mixed to form a mixed liquid layer (a transparent resin solution applying step), and then a mixed liquid layer formed in the above step is cured (curing step) to produce a color filter.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a color filter and a liquid crystal display device,

The present invention relates to an inkjet ink for a color filter used for forming a cured layer of a predetermined pattern such as a pixel portion (colored layer), a method for producing the inkjet ink, a method for manufacturing a color filter using the inkjet ink, And a method of manufacturing a liquid crystal display device using the color filter.

In recent years, with the development of personal computers, especially the development of laptops, the demand of liquid crystal displays, especially color liquid crystal displays, tends to increase. However, since this color liquid crystal monitor is expensive, there is a growing demand for cost reduction. In particular, there is a high demand for cost reduction for a color filter having a high price.

In such a color filter, for example, colored layers of three primary colors of red (R), green (G), and blue (B) are usually formed on the surface of a transparent substrate formed of glass or plastic, It is common to adopt a structure in which a protective film is formed. The colored layers of the three colors constitute pixels, and the liquid crystal acts as a shutter by turning on and off the electrodes corresponding to the respective pixels of R, G, and B. By appropriately passing light through each pixel, Display is performed.

A black matrix formed of a light shielding layer is formed between the pixels. Further, a transparent electrode layer made of an ITO film or the like is formed on the protective film. The protective film is formed for the purpose of preventing thermal deterioration of the colored layer in the process of forming the transparent electrode layer which flattenes the surface step difference in the state where the colored layer is formed.

As a conventional method for producing a color filter, for example, a dyeing method can be mentioned. In this dyeing method, a water-soluble polymer material as a dyeing material is first formed on a glass substrate, and the resultant is patterned into a desired shape by a photolithography process, and the obtained pattern is dipped in a dyeing bath to obtain a colored pattern. This is repeated three times to form R, G, and B color filter layers.

Another method is a pigment dispersion method. In this method, a photosensitive resin layer in which a pigment is dispersed is first formed on a substrate and patterned to obtain a monochromatic pattern. This process is repeated three times to form R, G, and B color filter layers.

As still another method, a method of electrodeposition or a method of dispersing a pigment in a thermosetting resin to print R, G, and B three times and thermally curing the resin can be given.

However, in any of the methods, it is necessary to repeat the same process three times in order to color R, G, and B three colors, and there is a problem of high cost and a problem that the production yield is lowered because the same process is repeated have.

As a method of manufacturing a color filter that solves these problems, there has been proposed a method of forming a colored layer (pixel portion) on the substrate surface by an ink jet method.

In the coloring step by the ink-jet method, any one of R, G, and B inks is ejected from the tip of the nozzle of the ink-jet ejection head, and ink is ejected onto the surface of the substrate in accordance with the pattern to form a colored layer. According to the ink-jet method, since each of the R, G, and B coloring steps can be performed one time, attention is paid to the fact that the manufacturing cost is reduced.

In order to eject the ink by an ink-jet method in accordance with an accurate pattern to form a pixel, directivity and stability of the ink when ejected from the ejection head are required. However, if the evaporation rate of the ink is excessively high, the viscosity of the ink suddenly increases at the tip of the nozzle of the discharge head to cause air bending of the ink droplet, or if it is intermittently discharged over time, clogging may occur, . In addition, as the coloring agent of the color filter, a pigment is often used, but if the pigment dispersibility of the color filter ink is poor, clogging occurs from the nozzle portion of the ejection head due to agglomeration of the pigment particles. Therefore, when a pigment is used as a coloring agent, the pigment dispersibility also affects the ink discharge performance.

(Patent Document 1) discloses a method for producing a color filter by ejecting colored ink by a jetting method to form a colored layer (pixel portion), wherein a resin (photocurable resin) having radiation curable properties by visible light or ultraviolet light is used as a binder resin It is described that a colored ink (photocurable ink) may be used. However, if such a conventional photocurable ink is directly used in an inkjet method, drying of the ink proceeds at the tip of the head of the inkjet while gradually increasing the viscosity of the colored ink, thereby deteriorating the dischargeability. As a result, there is a possibility that the discharge amount and discharge direction of the colored ink become unstable, or clogging occurs in the head of the ink jet. In the case of using the ink containing the colorant and the binder component, there is a problem that the ejection stability as an ink jet is deteriorated due to adhesion of the ink in the nozzle, and in the worst case, ejection becomes impossible immediately.

In Patent Document 2, a resin composition layer having an ink absorbing ability is formed on a transparent substrate, the ink composition is applied to the resin composition layer in accordance with a predetermined coloring pattern to color the resin composition layer, A plurality of colored resin composition layers are laminated to form a colored layer. However, in the manufacturing method disclosed herein, since the pigment concentration of the colored ink is low, it is necessary to take a complicated process of repeating the ink filling step to obtain color purity and color reproducibility as a color filter, and the production yield is lowered.

As a color filter constituting a liquid crystal element, it is required to have high color purity and high color reproducibility, that is, a high colorant concentration in a colored portion. Therefore, in order to manufacture such a color filter by an ink jet method, However, if the amount of ink to be imparted is increased, it is difficult to suppress the occurrence of color mixture resulting from the ink being pushed out, so that a color filter can not be produced with a good yield.

As described above, the method for producing a color filter by forming a coloring layer by an ink-jet method, which is excellent in straightness and stability when ejected from the head of the ink-jet nozzle and has high color purity and color reproducibility I have not gotten a way to get it yet.

Patent Document 1: JP-A-11-295520 Patent Document 2: JP-A-2002-311224

Disclosure of Invention Problem to be Solved by the Invention The present invention is to provide an ink-jet recording head which is excellent in straightness and stability when ejected from a head, easily spreads to every corner of the entire ink layer formation region and can impart high color purity and color reproducibility A method of manufacturing a color filter using the inkjet ink, a method of manufacturing a color filter using the inkjet ink, and a method of manufacturing a liquid crystal display device using the method of manufacturing the color filter.

DISCLOSURE OF THE INVENTION The present inventors have found that the above problems can be solved by dividing and applying the pigment as the coloring component and the transparent resin as the binder component into the pigment dispersion and the transparent resin solution, The present invention has been completed.

That is, the present invention is a method of manufacturing a color filter and the liquid crystal display device using the same, which are shown in the following (1) to (9).

(1) a step of selectively applying a pigment dispersion to a gap between the transparent substrate and the transparent substrate by an inkjet method (a pigment dispersion coating step), and after the pigment dispersion coating step, (A transparent resin solution application step) of mixing the pigment dispersion and the transparent resin solution in the gap and a step of curing the mixed solution layer of the pigment dispersion and the transparent resin solution formed in the transparent resin solution application step A process for producing a color filter comprising a process (curing process).

(2) The method for producing a color filter according to (1), wherein the coloring liquid layer formed by the pigment dispersion coating step has a thickness of 0.4 to 2 m.

(3) The method of manufacturing a color filter according to claim 1 or 2, wherein the mixed liquid layer is formed to have the same thickness as the boundary portion.

(4) The process for producing a color filter according to any one of claims 1 to 3, wherein in the step of applying the pigment dispersion, the colored liquid layer formed by applying the pigment dispersion is dried at a temperature of 40 to 160 캜.

(5) The color filter according to any one of claims 1 to 4, wherein the mixed liquid layer obtained by mixing the pigment dispersion and the transparent resin solution in the transparent resin solution applying step is dried at a temperature of 80 to 200 캜 Gt;

(6) The method for producing a color filter according to any one of claims 1 to 5, wherein a solid content ratio of the pigment and the transparent resin in the mixed liquid layer after curing the mixed liquid layer is 1: 0.4 to 1.

(7) The method for producing a color filter according to any one of (1) to (6), wherein the pigment dispersion comprises at least a pigment, a pigment dispersant and a solvent, and the boiling point of the solvent is 200 ° C or higher.

(8) The method for producing a color filter according to any one of claims 1 to 7, wherein the transparent resin composition contained in the transparent resin solution is a photo-curable resin composition.

(9) A liquid crystal display device comprising a color filter manufactured by the manufacturing method according to any one of claims 1 to 8, an opposing substrate, and a liquid crystal composition sandwiched between the color filter and the counter substrate Device.

According to the present invention, a pigment as a coloring component and a transparent resin as a binder component are separately prepared by dividing into a pigment dispersion and a transparent resin solution each having a relatively low viscosity, and each solution is applied on a transparent insulating substrate in each step, The effect shown in Fig.

(1) Since the pigment dispersion and the transparent resin solution have suitable viscosity, they are excellent in straightness and stability when discharged from the discharge head. Therefore, when the viscosity of the ink suddenly increases at the tip of the nozzle of the ejection head to cause air bending of the ink droplet, or when the ink is intermittently ejected over time, clogging occurs and the ink can not be ejected again. It is excellent.

(2) Since it is possible to imprint a pigment dispersion having a high pigment concentration at a low point, coloring components are not applied several times in order to obtain color purity and color reproducibility as color filters, It becomes possible to apply an amount of a coloring component and can be produced in good yield along a liquid crystal device having excellent color display characteristics.

(3) The deposited ink droplets tend to spread to every corner of the entire ink layer forming region without showing problems such as color mixing.

Therefore, according to the present invention, it is possible to manufacture a color filter having high performance and high reliability at a low cost, and in particular, it is possible to manufacture a color filter having a high transmittance density and uniformity, A filter can be manufactured. Further, according to the present invention, since a color filter having a better performance is used, a liquid crystal display element having excellent color display characteristics can be provided at a high yield, and a high-quality liquid crystal display device can be manufactured.

1. Manufacturing Method of Color Filter

A method of manufacturing a color filter according to the present invention includes the steps of selectively applying a pigment dispersion to a gap of a boundary on a transparent insulating substrate by an inkjet method (pigment dispersion coating process), and after the pigment dispersion coating process, (A transparent resin solution applying step) of mixing a pigment dispersion and a transparent resin solution in the gap by selectively applying a transparent resin solution to the transparent resin solution by an inkjet method, (Curing step) of curing the mixed liquid layer of the solution.

(1) Pigment dispersion

In the production method of the present invention, the pigment dispersion used in the pigment dispersion application step is composed of at least a pigment and a solvent, and other components are blended as required.

(a) Pigment

As the coloring agent, any one of organic coloring agents and inorganic coloring agents may be selected and used in accordance with R, G, B, etc. of the pixel (pixel portion) or the color required by the black matrix layer. As the organic colorant, for example, dyes, organic pigments, natural pigments and the like can be used. As the inorganic coloring agent, for example, inorganic pigments, extender pigments and the like can be used.

Among them, organic pigments are preferably used since they have high coloring property and high heat resistance. As the organic pigment, for example, a compound classified as a pigment in the color index (C.1., Published by The Society of Dyers and Colourists), specifically, a color index (CI) number as described below .

CI Pigment Yellow 1, CI Pigment Yellow 3, CI Pigment Yellow 12, CI Pigment Yellow 13, CI Pigment Yellow 14, CI Pigment Yellow 15, CI Pigment Yellow 16, CI Pigment Yellow 17, CI Pigment Yellow 20, CI Pigment Yellow 24, CI Pigment Yellow 31, CI Pigment Yellow 55, CI Pigment Yellow 60, CI Pigment Yellow 61, CI Pigment Yellow 65, CI Pigment Yellow 71, 73, CI Pigment Yellow 74, CI Pigment Yellow 81, CI Pigment Yellow 83, CI Pigment Yellow 93, CI Pigment Yellow 95, CI Pigment Yellow 97, CI Pigment Yellow 98, CI Pigment Yellow 100, CI Pigment Yellow 101, CI Pigment Yellow 104, CI Pigment Yellow 106, CI Pigment Yellow 108, CI Pigment Yellow 109, CI Pigment Yellow 110, CI Pigment Yellow 113, CI Pigment Yellow 114, Ment Yellow 116, CI Pigment Yellow 117, CI Pigment Yellow 119, CI Pigment 120, CI Pigment Yellow 126, CI Pigment Yellow 127, CI Pigment Yellow 128, CI Pigment Yellow 129, CI Pigment Yellow 138, CI Pigment Yellow 139, CI Pigment Yellow 150, CI Pigment Yellow 151 , CI Pigment Yellow 152, CI Pigment Yellow 153, CI Pigment Yellow 154, CI Pigment Yellow 155, CI Pigment Yellow 156, CI Pigment Yellow 166, CI Pigment Yellow 168, CI Pigment Yellow 175;

CI Pigment Orange 1, CI Pigment Orange 5, CI Pigment Orange 13, CI Pigment Orange 14, CI Pigment Orange 16, CI Pigment Orange 17, CI Pigment Orange 24, CI Pigment Orange 34, CI PIGMENT ORANGE 38, CI PIGMENT ORANGE 40, CI PIGMENT ORANGE 43, CI PIGMENT ORANGE 46, CI PIGMENT ORANGE 49, CI PIGMENT ORANGE 51, CI PIGMENT ORANGE 61, CI PIGMENT ORANGE 63, CI Pigment Orange 64, CI Pigment Orange 71, CI Pigment Orange 73; CI Pigment Violet 1, CI Pigment Violet 19, CI Pigment Violet 23, CI Pigment Violet 29, CI Pigment Violet 32, CI Pigment Violet 36, CI Pigment Violet 38;

CI Pigment Red 1, CI Pigment Red 2, CI Pigment Red 3, CI Pigment Red 4, CI Pigment Red 5, CI Pigment Red 6, CI Pigment Red 7, CI Pigment Red 8, CI Pigment Red 12, CI Pigment Red 11, CI Pigment Red 12, CI Pigment Red 14, CI Pigment Red 15, CI Pigment Red 16, CI Pigment Red 17, CI Pigment Red 18, CI Pigment Red 19, CI Pigment Red 21, CI Pigment Red 22, CI Pigment Red 23, CI Pigment Red 30, CI Pigment Red 31, CI Pigment Red 32, CI Pigment Red 37, CI Pigment Red 38, CI Pigment Red 40, CI Pigment Red 41, CI Pigment Red 42, CI Pigment Red 48: 1, CI Pigment Red 48: CI Pigment Red 49: 1, CI Pigment Red 49: 2, CI Pigment Red 50: 1, CI Pigment Red CI Pigment Red 57: 2, CI Pigment Red 58: 2, CI Pigment Red 58: 4, CI Pigment Red 57: CI Pigment Red 63: 1, CI Pigment Red 63: 2, CI Pigment Red 64: 1, CI Pigment Red 81: 1, CI Pigment Red 83, CI Pigment Red 63: 88, CI Pigment Red 90: 1, CI Pigment Red 97, CI Pigment Red 101, CI Pigment Red 102, CI Pigment Red 104, CI Pigment Red 105, CI Pigment Red 106, CI Pigment Red 108, CI Pigment Red 112, CI Pigment Red 113, CI Pigment Red 114, CI Pigment Red 122, CI Pigment Red 123, CI Pigment Red 144, CI Pigment Red 146, CI Pigment Red 149, CI Pigment Red 150, CI Pigment Red 151, CI Pigment Red 166, CI Pigment Red 168, CI Pigment Red 170, CI Pigment Red 171, CI Pig CI Pigment Red 174, CI Pigment Red 175, CI Pigment Red 176, CI Pigment Red 177, CI Pigment Red 178, CI Pigment Red 179, CI Pigment Red 180, CI Pigment Red 185, CI Pigment Red 187, CI Pigment Red 188, CI Pigment Red 190, CI Pigment Red 193, CI Pigment Red 194, CI Pigment Red 202, CI Pigment Red 206, CI Pigment Red 207 , CI Pigment Red 208, CI Pigment Red 209, CI Pigment Red 215, CI Pigment Red 216, CI Pigment Red 220, CI Pigment Red 224, CI Pigment Red 226, CI Pigment Red 242, Pigment Red 243, CI Pigment Red 245, CI Pigment Red 254, CI Pigment Red 255, CI Pigment Red 264, CI Pigment Red 265;

 CI Pigment Blue 15, CI Pigment Blue 15: 3, CI Pigment Blue 15: 4, CI Pigment Blue 15: 6, CI Pigment Blue 60; C. I. Pigment Green 7, C. I. Pigment Green 36; CI Pigment Brown 23, CI Pigment Brown 25; C.I. Pigment Black 1, C.I. Pigment Black 7.

Specific examples of the inorganic pigments or extender pigments include titanium oxide, barium sulfate, calcium carbonate, zinc oxide, lead sulfate, yellow lead, zinc sulfur, spinach (red iron oxide (III)), cadmium red, , Cobalt green, umber, titanium black, synthetic iron black, and carbon black. In the present invention, the pigments may be used alone or in combination of two or more.

In the case of forming pixels, the pigment is usually compounded in a proportion of 1 to 60% by weight, preferably 15 to 40% by weight, based on the total solid content of the inkjet ink. If the pigment is too small, there is a possibility that the transmittance density when the inkjet ink is coated with a predetermined film thickness (usually 0.1 to 2.0 탆) is insufficient. If the amount of the pigment is too large, there is a possibility that the properties of the coating film such as adhesion to the substrate, surface roughness of the cured film, and hardness of the coating film when the inkjet ink is applied and cured on the substrate are insufficient.

(b) Solvent

The solvent of the pigment dispersion used in the present invention is selected by the printability of the ink jet apparatus. Preferably a boiling point of 200 DEG C or higher, more preferably 240 DEG C or higher. Since the solvent has a boiling point of 200 ° C or higher, it has an appropriate drying and evaporating property, is excellent in straightness and stability when ejected from a head, can be efficiently dried, It becomes easy to spread to every corner of the whole. As a result, it is possible to spread the ink landed on the edge portion of the black matrix with respect to the diversified substrate, and it is possible to prevent the color drop of the pixel and the lowering of the brightness. If the boiling point is less than 200 占 폚, dryness in the vicinity of the nozzle is remarkably increased, resulting in occurrence of defects such as nozzle clogging.

The solvent preferably has a surface tension range of 25 to 35 mN / m, more preferably 26 to 32 mN / m. If the surface tension is excessively high, there may be a drawback that the stability of the dot shape of the inkjet sheet is remarkably adversely affected, or the ink does not spread in the gap between the boundaries. If the surface tension is too low, there is a drawback that the stability of the dot shape of the ink jetting is remarkably adversely affected, or the possibility that the ink is diffused over the boundary portion and mixed is increased.

Specific examples of the solvent that satisfies these conditions include diethylene glycol ethyl ether, diethylene glycol n-butyl ether, diethylene glycol n-butyl ether acetate, diethylene glycol hexyl ether, dipropylene glycol methyl ether acetate, Glycol n-propyl ether, dipropylene glycol n-butyl ether, and the like. If necessary, two or more kinds of solvents may be mixed and adjusted so as to satisfy the above conditions. Among these solvents, particularly preferred solvents are dipropylene glycol methyl ether acetate and diethylene glycol n-butyl ether acetate.

(c) Other components

As the other components of the pigment dispersion of the present invention, a pigment dispersing agent, a filler, a polymeric aggregation preventing agent other than a binder polymer, and the like can be blended.

(Pigment dispersant)

The pigment dispersant is blended as required in the ink in order to disperse the pigment well. As the pigment dispersant, for example, a surfactant such as a cationic, anionic, nonionic, amphoteric, silicone, or fluoric surfactant can be used. Among the surfactants, the following polymer surfactants (polymer dispersants) are preferable.

That is, polyoxyethylene alkyl ethers such as polyoxyethylene lauryl ether, polyoxyethylene stearyl ether and polyoxyethylene oleyl ether; Polyoxyethylene alkyl phenyl ethers such as polyoxyethylene octyl phenyl ether and polyoxyethylene nonyl phenyl ether; Polyethylene glycol diesters such as polyethylene glycol dilaurate and polyethylene glycol distearate; Sorbitan fatty acid esters; Fatty acid modified polyesters; Tertiary amine-modified polyurethanes and the like can be preferably used.

(2) A transparent resin solution

The transparent resin solution used in the transparent resin solution application step of the present invention is composed of at least a transparent resin component and a solvent, and other components are blended if necessary. Examples of the transparent resin component include a photo-curable resin composition, a thermosetting resin composition, and the like.

(a) a photocurable resin composition

As the photo-curable resin composition, a polymer having a relatively high molecular weight (high molecular weight polymer), a multifunctional monomer having two or more photopolymerizable functional groups, an oligomer, a bifunctional monomer having two photopolymerizable functional groups, And a photopolymerization initiator which is activated by light or light. It is also possible to form a reactive monomer having a relatively low viscosity as a reactive diluent. Examples of other additives include fillers, polymer compounds other than the binder polymer, surfactants, adhesion promoters, anti-aggregation agents, organic acids, and curing agents. Examples of the surfactant include nonionic surfactants, cationic surfactants, anionic surfactants, and amphoteric surfactants.

(High molecular weight polymer)

A polymer having a relatively high molecular weight (high molecular weight polymer) means a higher molecular weight than a so-called monomer or oligomer, and a weight average molecular weight of 5,000 or more can be targeted. As the polymer, any of the polymer having no polymerization reactivity per se and the polymer having the polymerization reactivity itself may be used, or two or more of them may be used in combination.

The polymer is usually blended in a proportion of 1 to 50% by weight based on the total solid content of the transparent resin solution. Here, the solid content of the ink for specifying the blending ratio includes all the components except for the solvent, and the liquid polymeric monomer is also included in the solid content.

In the present invention, a polymer having a relatively high molecular weight is blended into a transparent resin solution for a color filter. Of these, oligomers, which are polymers having polymerization reactivity in themselves, are most readily available on the market and include, for example, ester acrylates, ethyl acrylates, urethane acrylates, epoxy acrylates, Acrylates, acryl resin acrylates, unsaturated polyesters and the like.

The molecular weight of the ethylenic double bond-containing compound used as a polymer having polymerization reactivity per se is not more than 25,000 in terms of weight average molecular weight so that the viscosity of the ink according to the present invention is too high to adversely affect dischargeability from the discharge head desirable.

(Polymer having no polymerization reactivity)

As a polymer which is not itself polymerizable, for example, a copolymer composed of two or more of the following monomers can be used: acrylic acid, methacrylic acid, methyl acrylate, methyl methacrylate, 2- Hydroxyethyl methacrylate, benzyl acrylate, benzyl methacrylate, styrene, polystyrene macromonomer, and polymethyl methacrylate macromonomer.

More specifically, acrylic acid / benzyl acrylate / styrene copolymer, acrylic acid / methyl acrylate / polystyrene macromonomer copolymer, acrylic acid / methyl acrylate / styrene copolymer, acrylic acid / benzyl acrylate copolymer, Polymethyl methacrylate macromonomer copolymer, acrylic acid / benzyl acrylate / polystyrene macromonomer copolymer, acrylic acid / benzyl acrylate / polymethyl methacrylate macromonomer copolymer, acrylic acid / 2-hydroxyethyl acrylate / benzyl acrylate Acrylate / benzyl acrylate / polymethyl methacrylate macromonomer copolymer, acrylic acid / benzyl methacrylate copolymer, acrylic acid / methyl methacrylate / styrene copolymer Acrylic acid / benzyl methacrylate Acrylate / methyl methacrylate / polystyrene macromonomer copolymer, acrylate / methyl methacrylate / polymethyl methacrylate macromonomer copolymer, acrylic acid / benzyl methacrylate / polystyrene macromonomer copolymer, acrylate / Acrylic acid / 2-hydroxyethyl methacrylate / benzyl methacrylate / polystyrene macromonomer copolymer, acrylic acid / 2-hydroxyethyl methacrylate / polystyrene macromonomer copolymer, acrylic acid / benzyl methacrylate / polymethyl methacrylate macromonomer copolymer, acrylic acid / Benzyl methacrylate / polymethyl methacrylate macromonomer copolymer, and the like can be used.

Specific examples further include a methacrylic acid / benzyl acrylate copolymer, a methacrylic acid / methyl acrylate / styrene copolymer, a methacrylic acid / benzyl acrylate / styrene copolymer, methacrylic acid / methyl acrylate / polystyrene Methacrylic acid / benzyl acrylate / polystyrene macromonomer copolymer, methacrylic acid / benzyl acrylate / polymethyl methacrylate copolymer, methacrylic acid / methyl acrylate / polymethyl methacrylate macromonomer copolymer, methacrylic acid / benzyl acrylate / polystyrene macromonomer copolymer, Methacrylic acid / 2-hydroxyethyl acrylate / benzyl acrylate / polymethyl methacrylate Macromonomer copolymer, methacrylic acid / 2-hydroxyethyl acrylate / benzyl acrylate / polystyrene macromonomer copolymer, methacrylic acid / Copolymers, methacrylic acid / benzyl methacrylate copolymers, methacrylic acid / methyl methacrylate / Styrene copolymer, methacrylic acid / benzyl methacrylate / styrene copolymer, methacrylic acid / methyl methacrylate / polystyrene macromonomer copolymer, methacrylic acid / methyl methacrylate / polymethyl methacrylate macromonomer copolymer , Methacrylic acid / benzyl methacrylate / polystyrene macromonomer copolymer, methacrylic acid / benzyl methacrylate / polymethyl methacrylate macromonomer copolymer, methacrylic acid / 2-hydroxyethyl methacrylate / benzyl methacrylate Methacrylic acid copolymer such as acrylate / polystyrene macromonomer copolymer, methacrylic acid / 2-hydroxyethyl methacrylate / benzyl methacrylate / polymethyl methacrylate macromonomer copolymer, and the like.

(Polyfunctional monomer)

In the present invention, a polyfunctional monomer is blended in the transparent resin solution. Conventionally, a monomer (multifunctional monomer) having two or more polymerizable functional groups has been incorporated in the photo-curable composition in order to increase the film strength of the cured layer obtained by curing the photo-curable composition and the adhesion to the substrate. However, A polyfunctional monomer having three or more functional groups is usually used.

However, when a multifunctional monomer having a large number of functional groups is blended in the photocurable composition and is ejected onto the substrate by an inkjet method, the ink dries at the tip of the inkjet head during the ejection operation, resulting in a gradual increase in viscosity and poor ejectability of ink.

The mixing ratio of the multifunctional monomer is usually 20 to 70% by weight based on the total solid content of the transparent resin solution.

If the compounding ratio of the polyfunctional monomer does not account for 20% by weight of the total solid content, the crosslinking density of the coating film is lowered, and the solvent resistance, adhesion and hardness of the coating film are lowered, . When the compounding ratio of the polyfunctional monomer exceeds 70% by weight of the total solid content, the ink composition (transparent resin solution) is not sufficiently diluted with the monomer, and the viscosity of the ink is high from the beginning or after the volatilization of the solvent The hole of the ink-jet head may be clogged.

(Monofunctional monomer)

Examples of the monofunctional monomer (monofunctional polymerizable compound) include nonylphenylcarbitol acrylate, 2-hydroxy-3-phenoxypropyl acrylate, 2-ethylhexylcarbitol acrylate, 2-hydroxyethyl acrylate , N-vinylpyrrolidone, and the like.

(Bifunctional and trifunctional monomers)

Examples of the multifunctional monomer having two or more photopolymerizable functional groups include bifunctional monomers and multifunctional monomers having three or more functional groups.

Examples of the bifunctional monomer include 1,6-hexanediol diacrylate, 1,6-hexanediol dimethacrylate, 1,9-nonanediol diacrylate, 1,9-nonanediol dimethacrylate, 1,10-decanediol diacrylate, 1,10-decanediol dimethacrylate, ethylene glycol diacrylate, ethylene glycol dimethacrylate, neopentyl glycol diacrylate hydroxypivalate, hydroxypivalic acid Polytetramethylene glycol diacrylate, polytetramethylene glycol dimethacrylate, diethylene glycol diacrylate, diethylene glycol dimethacrylate, tripropylene glycol diacrylate, tripropylene glycol diacrylate, tripropylene glycol dimethacrylate, Glycol dimethacrylate, neopentyl glycol diacrylate, neopentyl glycol dimethacrylate, triethylene glycol diacrylate, triethylene glycol dimethacrylate, Polyethylene glycols (200) diacrylates, polyethylene glycols (200) dimethacrylates, polyethylene glycols (400) diacrylates, polyethylene glycols (400) dimethacrylates, polyethylene glycol (600) diacrylates, Polyethylene glycol (600) dimethacrylate, bis (acryloyloxyethyl) ether of bisphenol A, 3-methylpentanediol diacrylate, 3-methylpentanediol dimethacrylate, dimethyrol tricyclodecane diacrylate , Dimethyrol tricyclodecane dimethacrylate, and the like.

Examples of the multifunctional monomer having three or more functional groups include trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, ethylene oxide modified trimethylpropane triacrylate, ethylene oxide modified trimethylpropane trimethacrylate, pentaerythritol tri Acrylate, pentaerythritol trimethacrylate, tris (2-hydroxyethyl) isocyanurate triacrylate, tris (2-hydroxyethyl) isocyanurate trimethacrylate, propoxylated glyceryl triacryl Propoxylated glyceryl trimethacrylate, pentaerythritol tetraacrylate, pentaerythritol tetramethacrylate, ditrimethylol propane tetraacrylate, ditrimethylol propane tetramethacrylate, ethoxylated pentaerythritol tetraacrylate Late, ethoxylated pentaerythritol Three toll tetra methacrylate, dipentaerythritol hydroxy, and the like hydroxy pentaacrylate, dipentaerythritol hydroxy penta-methacrylate, dipentaerythritol hexaacrylate, dipentaerythritol hexa methacrylate.

(Reactive diluent)

A " reactive diluent " is a monomer having at least one reactive group of a double bond in the molecule at the molecular end. As the reactive diluent, for example, monofunctional caprolactone acrylate, tridecyl acrylate, isodecyl acrylate, isooctyl acrylate, isomyristyl acrylate, isostearyl acrylate, 2-ethylhexyldiglycol Acrylate, 2-hydroxybutyl acrylate, 2-acryloyloxyethyl hexahydrophthalic acid, neopentyl glycol acrylate benzoate, isoamyl acrylate, lauryl acrylate, stearyl acrylate, butoxyethyl acrylate, Methoxyethyleneglycol acrylate, methoxyethyleneglycol acrylate, methoxypolyethylene glycol acrylate, methoxydipropylene glycol acrylate, phenoxyethyl acrylate, phenoxypolyethylene glycol acrylate, nonylphenol ethylene oxide adduct acrylate, Tetrahydrofurfuryl acrylate , Isobornyl acrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 2-hydroxy-3-phenoxypropyl acrylate, 2-acryloyloxyethyl succinate, Ethyl phthalic acid, and 2-acryloyloxyethyl-2-hydroxyethyl phthalic acid.

(Photopolymerization initiator)

The photopolymerization initiator is appropriately selected in consideration of the difference in reaction type (for example, radical polymerization or cationic polymerization) of the polymer having a relatively high molecular weight, the polyfunctional monomer, the bifunctional monomer or the monofunctional monomer, In order to cure the pigmented ink, it is added as needed.

The polymerization initiator may be an active radical generator that generates active radicals by light or heat. Examples of the photopolymerization initiator include acetophenone compounds, benzoin compounds, benzophenone compounds, thioxanthone compounds, triazine compounds, and the like.

Examples of the acetophenone compound include diethoxyacetophenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, benzyldimethylketal, 2- (2-hydroxyethoxy) phenyl] propan-1-one, 1-hydroxycyclohexyl phenyl ketone, 2-methyl-2-morpholino- 2-methyl-1- [4- (1-methylvinyl) phenyl] propan-1-one And the like.

Examples of the benzoin compound include benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin isobutyl ether and the like.

Examples of the benzophenone compound include benzophenone, methyl o-benzoylbenzoate, 4-phenylbenzophenone, 4-benzoyl-4'-methyldiphenylsulfide, 3,3 ', 4,4'- Butyl peroxycarbonyl) benzophenone, 2,4,6-trimethylbenzophenone, and the like.

Examples of the thioxanthone compound include 2-isopropylthioxanthone, 4-isopropylthioxanthone, 2,4-diethylthioxanthone, 2,4-dichlorothioxanthone, 1- Propanedioxanthone, and the like.

Examples of the triazine compound include 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, (Trichloromethyl) -6- [2- (5-methylpyran-2-yl) -1,3,5-triazine, 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, 2,4- ) -6- [2- (3,4-dimethoxyphenyl) ethenyl] -1,3,5-triazine.

As the radical generator, for example, 2,4,6-trimethylbenzoyldiphenylphosphine oxide, 2,2'-bis (o-chlorophenyl) -4,4 ', 5,5'-tetraphenyl Benzyl, 9,10-phenanthrenequinone, camphorquinone, methyl phenylglyoxylate, a titanocene compound, etc. may be used. May be used.

A commercially available active radical generator may be used. Commercially available polymerization initiators include, for example, "Irgacure-369" (acetophenone-based photopolymerization initiator, manufactured by Ciba Specialty Chemicals).

Examples of the thermal polymerization initiator include an azo dye-based compound and a peroxide-based compound. Examples of the azo dye compound include azo compounds such as 2,2'-azobis (4-methoxy-2,4-dimethylvaleronitrile), 2,2'-azobis (4-methyl-2,4-dimethylvaleronitrile) Azobis (cyclohexane-1-carbonitrile), 2,2'-azobis (2-methylbutyronitrile) Azo compounds such as 2,2'-azobis [N-2 (propenyl) -2-methyl-propionamide], 1, [(cyano-1-methylethyl) azo dye] formamide, 2,2'-azobis (N-cyclohexyl-2-methylpropionamide), a polymer azo dye polymerization initiator containing a polydimethylsiloxane unit (manufactured by Wako Pure Chemical Industries, Ltd., VPS series ), A polyethylene glycol unit-containing polymeric polymerization initiator (Wako Pure Chemical Industries, VPE series), and the like.

Examples of the peroxide compound include peroxyketals, hydroperoxides, dialkyl peroxides, diacyl peroxides, peroxydicarbonates, and peroxy esters. Examples of peroxy esters include t-butyl-peroxy-lactate (trade name, perbutyl L), t-butyl-peroxy-3,5,5-trimethyl-hexanoate Perfluoro-isopropyl-monocarbonate (manufactured by Nippon Oil & Fats Co., Ltd., trade name "Perhexyl L"), and the like.

These polymerization initiators may be used alone or in combination of two or more. The amount of the polymerization initiator used is generally 1 part by mass or more and 30 parts by mass or less, preferably 3 parts by mass or more and 20 parts by mass or less based on 100 parts by mass of the total amount of the binder polymer and the polymerizable compound.

(Other additives)

Examples of other additives include fillers, polymer compounds other than the binder polymer, surfactants, adhesion promoters, anti-aggregation agents, organic acids, and curing agents. Examples of the surfactant include nonionic surfactants, cationic surfactants, anionic surfactants, and amphoteric surfactants. Examples of the adhesion promoter include vinyltrimethoxysilane, vinyltriethoxysilane, vinyltris (2-methoxyethoxy) silane, N- (2-aminoethyl) -3-aminopropylmethyldimethoxysilane, N Aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, 2- (2-aminoethyl) (3,4-epoxycyclohexyl) ethyltrimethoxysilane, 3-chloropropylmethyldimethoxysilane, 3-chloropropyltrimethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3- Methoxysilane and the like.

(b) a thermosetting resin composition

The thermosetting resin composition according to the present invention is characterized by containing at least a thermosetting binder and a bifunctional to trifunctional epoxy group-containing monomer. A coloring agent, a dispersing agent, a curing accelerator, or other additives may be added to the thermosetting resin composition, if necessary. Further, in order to impart appropriate fluidity and dischargeability to the thermosensitive transparent resin composition for application to the ink jet system, the above-mentioned respective components may be dissolved or dispersed in a solvent (diluent). In addition, a tetrafunctional or higher epoxy group-containing resin may be used in combination with an epoxy group-containing monomer having two or more functional groups.

(bookbinder)

As the thermally-binding binder, for example, a homopolymer or copolymer obtained by polymerizing one or more kinds of monomers containing an ethylenic unsaturated bond and an epoxy group as shown below can be used: glycidyl acrylate, methacrylic acid Glycidyl acrylate, glycidyl acrylate, glycidyl acrylate, glycidyl glycidyl acrylate, glycidyl? -Propyl acrylate, glycidyl? -N-butyl acrylate, (Meth) acrylate such as epoxybutyl, methacrylic acid-4,5-epoxypentyl, acrylic acid-6,7-epoxyheptyl, methacrylic acid-6,7-epoxyheptyl, ) Acrylates; vinylphenyl glycidyl ether, m-vinylphenyl glycidyl ether, p-vinylphenyl glycidyl ether, o-vinyl benzyl glycidyl ether, m-vinyl benzyl glycidyl ether, p- Vinyl glycidyl ethers such as cyadyl ether; Diglycidyloxystyrene, 2,3-diglycidyloxystyrene, 3,4-diglycidyloxystyrene, 2,4-diglycidyloxystyrene, 3,5-diglycidyloxystyrene, 2,6- Vinyl pyrogallol triglycidyl ether, vinyl pyrogallol triglycidyl ether, 2,3-dihydroxymethyl styrene diglycidyl ether, 2,3-dihydroxymethyl styrene diglycidyl ether, , 3,4-dihydroxymethylstyrene diglycidyl ether, 2,4-dihydroxymethylstyrene diglycidyl ether, 3,5-dihydroxymethylstyrene diglycidyl ether, 2,6- Dihydroxymethyl styrene diglycidyl ether, 2,3,4-trihydroxymethyl styrene triglycidyl ether, and 1,3,5-trihydroxymethyl styrene triglycidyl ether.

A copolymer obtained by polymerizing one or more monomers containing an ethylenically unsaturated bond and an epoxy group as described above and a monomer having no epoxy group as described below may also be used as a thermosetting binder. , Methacrylic acid, methyl acrylate, methyl methacrylate, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, benzyl acrylate, benzyl methacrylate, styrene, polystyrene macromonomer, Acrylate macromonomer.

The binder is usually compounded in a proportion of 1 to 50% by weight based on the total solid content of the thermosetting resin composition. Here, the solid content of the thermosetting resin composition for specifying the mixing ratio includes all components except for the solvent, and the liquid polymeric monomer is also included in the solid content.

If the blending amount of the binder is less than the above range, the solvent resistance, adhesion, and hardness of the coating film may deteriorate, and sufficient characteristics may not be obtained. Beyond the above range, the ink composition (transparent resin solution) is not diluted sufficiently by the monomer, and the viscosity of the ink becomes high from the beginning or after the volatilization of the solvent, so that the hole of the inkjet head may be clogged.

(Epoxy group-containing monomer)

As the thermosetting component, one or two or more kinds of monomers having an epoxy group having two or more functionalities are used in combination in the thermosetting resin composition. The monomer having an epoxy group of bifunctional or trifunctional has a relatively low viscosity in the thermotropic resin and a small increase in viscosity due to drying. Therefore, the ink using such a bifunctional to tricyclic epoxy group-containing monomer as the thermally variable component During the ejection operation by the inkjet method, the viscosity at the tip of the head is hardly raised, and the dischargeability of the ink during the operation is stabilized without causing clogging of the head. Therefore, the ink discharge amount and discharge direction are kept constant, and the ink can be accurately and uniformly adhered to the substrate in a predetermined pattern.

Examples of the bifunctional or trifunctional epoxy group-containing monomer include polypropylene glycol diglycidyl ether, neopentyl glycol diglycidyl ether, polyethylene glycol diglycidyl ether, polypropylene glycol diglycidyl ether, tri But are not limited to, methylol propane polyglycidyl ether, 2,3-diglycidyloxystyrene, 3,4-diglycidyloxystyrene, 2,4-diglycidyloxystyrene, 3,5-diglycidyl Vinyl pyrogallol triglycidyl ether, vinyl fluoroglycollide triglycidyl ether, 2,3-di (tert-butyldimethylsilyl) glycidyl ether, Hydroxymethylstyrene diglycidyl ether, 3,4-dihydroxymethylstyrene diglycidyl ether, 2,4-dihydroxymethylstyrene diglycidyl ether, 3,5-dihydroxymethylstyrene di Glycidyl ether, 2,6-dihydroxymethylstyrene diglycidyl ether, 2,3,4-trihalo Dihydroxymethylstyrene triglycidyl ether, 1,3,5-trihydroxymethylstyrene triglycidyl ether, and the like. These may be used singly or in combination of two or more.

The blending ratio of the bifunctional to trifunctional epoxy group-containing monomer is usually from 20 to 70% by weight based on the total solid content of the thermosetting resin composition.

Here, when the compounding ratio of the bifunctional to trifunctional epoxy group-containing monomer does not account for 20% by weight of the total solids (all components other than the solvent), the transparent resin solution is not sufficiently diluted by the monomer, There is a possibility that the hole of the ink jet head is clogged because it is high from the beginning or after the volatilization of the solvent. When the compounding ratio of the bifunctional to trifunctional epoxy group-containing monomer is more than 70% by weight of the total solid content, the crosslinking density of the coating film is lowered and the solvent resistance, adhesion and hardness of the coating film are lowered, There is a concern.

(Other thermally variable component)

The thermosetting resin composition may contain, in addition to the aforementioned monomers having two or more functional groups, an epoxy group-containing monomer and / or a tetrafunctional or more epoxy group-containing monomer and / or an epoxy group- The thermally variable component may be blended.

Examples of monofunctional epoxy group-containing monomers include methyl glycidyl ether, butyl glycidyl ether, phenyl glycidyl ether, butyl phenyl glycidyl ether, 2-ethylhexyl glycidyl ether, decyl glycidyl ether, Sebacate ether, aryl glycidyl ether, polypropylene glycol glycidyl ether, and butoxypolyethylene glycol monoglycidyl ether.

Examples of the thermally variable component other than the epoxy group-containing monomer include melamine resin, urea resin, alkyd resin, phenol resin, cyclopentadiene resin and the like.

It is preferable to blend an epoxy group-containing resin having four or more functional groups together with an epoxy group-containing monomer having two or more functional groups. When all of the epoxy group-containing components contained in the thermosetting resin composition are bifunctional to trifunctional, it is difficult for the viscosity of the ink to rise due to the drying of the ink, so that the dischargeability of the inkjet head is stabilized. On the other hand, The film strength of the cured layer and the adhesion to the substrate may become insufficient. Therefore, sufficient amounts of the tetrafunctional or more epoxy group-containing resins together with the above-mentioned bifunctional to tricompoactive epoxy group-containing monomers can provide sufficient film strength and adhesion to the pattern of the cured layer.

Examples of the tetrafunctional or higher epoxy group-containing resin include novolak resins such as phenol novolak epoxy and cresol novolak epoxy, glycidyl amines such as tetraglycidyl diaminodiphenyl methane and tetraglycidyl methacryloyl diamine And glycidyl ether resins such as a resin, tetraphenyl glycidyl ether ethane, and triphenyl glycidyl ether methane.

The tetrafunctional or higher epoxy group-containing resin is preferably blended in an amount of usually 1 to 30% by weight based on the total solid content of the thermosensitive transparent resin composition. In order to balance the stabilization of the discharge property by containing two to three functional epoxy groups and the improvement of the strength and adhesion by the tetrafunctional or higher epoxy group-containing resin, it is preferable that the amount of the tetrafunctional or more epoxy group Containing resin is usually 1 to 50 parts by weight, preferably 2 parts by weight or less and / or the upper limit of the mixing ratio is 35 parts by weight or less.

When the mixing ratio of the tetrafunctional or higher epoxy group-containing resin is less than 1 part by weight based on 100 parts by weight of the 2 to 3 functional monomer, . When the blending ratio of the tetrafunctional or higher epoxy group-containing resin is more than 50 parts by weight, the curing speed of the ink becomes slow and the process speed may be slowed.

(Hardener)

In the thermosetting resin composition used in the present invention, a curing agent is usually incorporated. As the curing agent, for example, a polycarboxylic acid anhydride or a polycarboxylic acid can be used.

Specific examples of the polyvalent carboxylic acid anhydride include phthalic anhydride, itaconic anhydride, succinic anhydride, citraconic anhydride, dodecenyl succinic anhydride, anhydrous tricarboxylic acid, maleic anhydride, hexahydrophthalic anhydride, dimethyltetrahydrophthalic anhydride, Aliphatic or aliphatic dicarboxylic acid anhydrides such as anhydrous nadic acid; Aliphatic polycarboxylic dianhydrides such as 1,2,3,4-butanetetracarboxylic acid dianhydride and cyclopentanetetracarboxylic acid dianhydride; Aromatic polycarboxylic acid anhydrides such as anhydrous pyromellitic acid, trimellitic anhydride, and benzophenone tetracarboxylic anhydride; And ester group-containing acid anhydrides such as ethylene glycol bistrimellitate and glycerin tristrimellitate. Particularly preferred examples thereof include aromatic polycarboxylic anhydrides. An epoxy resin curing agent comprising a commercially available carboxylic acid anhydride may also be suitably used.

Specific examples of the polyvalent carboxylic acid used in the present invention include aliphatic polycarboxylic acids such as succinic acid, glutaric acid, adipic acid, butanetetracarboxylic acid, maleic acid and itaconic acid; Aliphatic polycarboxylic acids such as hexahydrophthalic acid, 1,2-cyclohexanedicarboxylic acid, 1,2,4-cyclohexanetricarboxylic acid and cyclopentanetetracarboxylic acid, and aromatic polycarboxylic acids such as phthalic acid, isophthalic acid, terephthalic acid, pyromellitic acid, trimellitic acid , 1,4,5,8-naphthalenetetracarboxylic acid, and benzophenonetetracarboxylic acid, and aromatic polycarboxylic acids are preferable.

These polyvalent carboxylic acid anhydrides and polyvalent carboxylic acids may be used singly or in combination of two or more. The amount of the curing agent to be used in the present invention is usually in the range of 1 to 100 parts by weight, preferably 5 to 50 parts by weight, per 100 parts by weight of the component (monomer and resin) containing an epoxy group. When the blending amount of the curing agent is less than 1 part by weight, curing becomes insufficient and a strong coating film can not be formed in some cases. When the blending amount of the curing agent is more than 100 parts by weight, the adhesion of the coating film to the substrate is deteriorated, and a uniform and smooth coating film may not be formed.

(Other additives)

Examples of other additives include fillers, polymer compounds other than the binder polymer, surfactants, adhesion promoters, anti-aggregation agents, organic acids, and curing agents. Examples of the surfactant include nonionic surfactants, cationic surfactants, anionic surfactants, and amphoteric surfactants. Examples of the adhesion promoter include vinyltrimethoxysilane, vinyltriethoxysilane, vinyltris (2-methoxyethoxy) silane, N- (2-aminoethyl) -3-aminopropylmethyldimethoxysilane, N Aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, 2- (2-aminoethyl) (3,4-epoxycyclohexyl) ethyltrimethoxysilane, 3-chloropropylmethyldimethoxysilane, 3-chloropropyltrimethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3- Methoxysilane and the like.

(c) Solvent

The solvent of the transparent resin solution is selected in accordance with the printability of the ink jet apparatus in the same manner as the solvent of the pigment dispersion liquid. Preferably, a solvent having a boiling point of 200 占 폚 or more is used. Further, a solvent having a surface tension range of preferably 25 to 35 mN / m is preferably used. Particularly preferably, a solvent having a surface tension range of 25 to 35 mN / m and a boiling point of 200 ° C or more is used. If the boiling point is less than 200 占 폚, dryness in the vicinity of the nozzle is remarkably increased, resulting in occurrence of defects such as nozzle clogging. If the surface tension is more than 35 mN / m, there is a fear that the stability of the dot shape of the ink jetting is considerably adversely affected, or that the transparent resin solution does not spread to every corner of the colored layer when applied on the colored layer .

Specific examples of the solvent satisfying these conditions include diethylene glycol ethyl ether, diethylene glycol n-butyl ether, diethylene glycol n-butyl ether acetate, diethylene glycol hexyl ether, dipropylene glycol methyl ether acetate, dipropylene Glycol n-propyl ether, dipropylene glycol n-butyl ether, and the like. If necessary, two or more kinds of solvents may be mixed and adjusted so as to satisfy the above conditions. Of these, dipropylene glycol methyl ether acetate and diethylene glycol n-butyl ether acetate are most preferred.

(3) Manufacture of color filters

A method of manufacturing a color filter according to the present invention includes the steps of selectively applying a pigment dispersion to a gap of a boundary on a transparent insulating substrate by an inkjet method (pigment dispersion coating process), and after the pigment dispersion coating process, (A transparent resin solution applying step) of mixing a pigment dispersion and a transparent resin solution in the gap by selectively applying a transparent resin solution to the transparent resin solution by an inkjet method, (Curing step) of curing the mixed liquid layer of the solution.

(a) Pigment dispersion application step

In the process of applying the pigment dispersion of the present invention, a boundary (black matrix) is first formed on the transparent insulating substrate of the color filter.

Examples of the transparent insulating substrate used in the color filter in the present invention include glass, silicon, polycarbonate, polyester, aromatic polyamide, polyamideimide, and polyimide. These transparent insulating substrates may be optionally subjected to pretreatment such as chemical treatment with a silane coupling agent or the like, plasma treatment, ion plating, sputtering, vapor phase reaction or vacuum deposition.

The material forming the boundary portion is a mixture of a resin component and a black pigment (carbon black, etc.) and / or a pigment such as R (red), G (green), B (blue), Y (yellow), V (violet) A black pigment, and a solvent for decomposing and dissolving these components. The resin material may be a negative type such as an acrylic resin used for general black photosensitive resin, or may be a positive type. The height of the boundary portion is preferably about the thickness of the transparent tinted resin film and is 1.5 占 퐉 or more and 5.0 占 퐉 or less and more preferably 2.0 占 퐉 or more and 4.0 占 퐉 or less when used as a color filter of the high color area specification. The width of the boundary portion is 10 占 퐉 or more and 30 占 퐉 or less, and the light transmitting region partitioned by the boundary portion is generally rectangular or curved with a width of 60 占 퐉 to 250 占 퐉.

In order to form the boundary on the transparent insulating substrate using this photosensitive resin, a thin film having a thickness of about 1 to 3 mu m is formed on the entire surface by, for example, spin coating or the like and then formed by a photoresist process (exposure and development) can do.

Subsequently, the pigment dispersion liquid in which the desired pigment such as R, G, B, or the like is blended in the gap of the boundary portion thus obtained, that is, the portion surrounded by the boundary (RGB pixel) is selectively adhered by the ink jet method, A pigment dispersion (colored liquid) is applied to the pixel portion or the light shielding layer to form a colored liquid layer. Although the thickness of the colored liquid layer differs depending on each layer of R, G and B, it is generally within the range of 0.4 to 2.0 占 퐉. If the thickness of the colored liquid layer is out of this range, a step may be formed between the boundary portion and the colored layer.

Next, the formed colored liquid layer is dried as required (preliminary drying step). By performing such preliminary drying, only the solvent component of the pigment dispersion can be reduced in a state in which the pigment is uniformly dispersed in the colored liquid layer. If the drying of the pigment dispersion (drying loss) is insufficient, the amount of liquid after mixing of the pigment dispersion and the transparent resin solution becomes large when the transparent resin solution is applied, and the mixed solution may come out from the boundary portion and mix color.

The drying is preferably carried out in a temperature range of 40 to 160 캜. If the drying temperature is too low, the change in the volume of the pigment dispersion becomes small, and there is a fear of color mixture when the transparent resin solution is applied. On the other hand, if the drying temperature is too high, the transparent resin solution may not spread uniformly on the colored liquid layer when the transparent resin solution is applied, and the surface of the cured film may become rough. The drying time is not particularly limited, but is preferably 1 to 20 minutes.

(b) Transparent resin solution application step

In the transparent resin solution application step of the present invention, a transparent resin solution is selectively applied to the gap between the boundary portions by an ink jet method, and the pigment dispersion and the transparent resin solution are mixed in the gap. That is, a transparent resin solution is applied on the colored liquid layer formed by the pigment dispersion application process to form a transparent resin layer, and both layers are mixed to form a mixed liquid layer (colored resin layer) comprising a colored liquid layer and a transparent resin layer .

When a transparent resin solution having a low viscosity is applied onto a dried pigment dispersion (coloring liquid layer), the pigment is redispersed in the transparent resin solution, whereby the pigment dispersion and the transparent resin solution are mixed or the coloring liquid layer and the transparent resin layer This fuses. Therefore, even if the colored liquid layer to be formed is completely dried by the preliminary drying step in the above-mentioned pigment dispersion coating step, the pigment and the transparent resin solution are sufficiently mixed.

The coating amount of the transparent resin solution is appropriately adjusted so that the difference in film thickness of the colored resin layer of each color of R, G, and B is 0.1 m or less although there is a difference depending on each RGB layer. The coating amount of the transparent resin solution is adjusted so that the solid content ratio of the pigment dispersion and the transparent resin solution after drying (the ratio of the solid content of the pigment to the transparent resin after the mixture layer is cured) becomes 1: 0.4 to 1 in pigment: transparent resin .

The mixed liquid layer (colored resin layer) is preferably formed to have the same thickness as the boundary portion, and it is necessary to adjust the application amount of the transparent resin solution. If the amount of the transparent resin solution to be applied is small relative to the pigment dispersion, there is a fear that it is not spread all over the colored resin layer. Also, when the amount of the transparent resin solution applied is large relative to the pigment dispersion, the thickness of the colored resin layer becomes large, and a colored resin layer having no step between the boundary portion and the colored resin layer can not be formed.

The thickness of the colored resin layer is approximately in the range of 1.0 to 2.5 mu m. If the thickness of the colored resin layer is out of this range, a step may be formed between the boundary portion and the coloring layer, which may cause a drawback that the flatness of the entire filter is deteriorated.

The step of drying the colored resin layer (pre-baking step) is preferably carried out in a temperature range of 80 to 200 ° C.

If the drying temperature is too low, the volume change of the colored resin layer becomes small, and the film thickness of the colored resin layer becomes large, so that a colored resin layer having no step between the boundary portion and the colored resin layer may not be formed. If the drying temperature is too high, the volume change of the colored resin layer becomes large, the thickness of the colored resin layer becomes small, and a colored resin layer having no step between the boundary portion and the colored resin layer may not be formed.

(c) Curing process

In the present invention, the mixed liquid layer of the pigment dispersion liquid and the transparent resin solution formed by the transparent resin solution application step is cured (curing step).

When the photo-curable resin composition is used as the transparent resin, the curing is performed by irradiating light. The light to be used is preferably ultraviolet light or visible light, and among these, light having a wavelength of 200 to 500 nm is preferable. Mercury-xenon lamps, excimer lamps, short arc lamps, helium-cadmium lasers, argon lamps, mercury lamps, and the like are used as the light sources. Examples of the light sources include low-pressure mercury lamps, high-pressure mercury lamps, ultrahigh-pressure mercury lamps, metal halide lamps, A laser, a light source such as THG or FHG laser using Nd-YAG laser, or the like can be used. The photocuring condition can not be determined uniformly under the influence of the kind of the light source to be used and the kind and amount of the photopolymerization initiator, but is generally preferably in the range of 100 to 3000 mJ / m 2. After photo-curing, post-curing (post-baking) treatment at 200 to 250 ° C for 10 to 30 minutes is performed.

When a thermosetting resin composition is used as the transparent resin, the curing is performed by heating. As the curing conditions by heating, the heating temperature is about 200 to 250 占 폚, and the heating time is about 20 to 60 minutes.

In the method of manufacturing a color filter of the present invention, after the mixed liquid layer (colored resin layer) is cured, a protective layer may be formed thereon if necessary. As the protective layer, usually, a resin composition layer of a photo-curing type, a thermosetting type or a heat / light curing type resin composition layer or an inorganic compound layer formed by vapor deposition or sputtering can be used.

Next, an ITO (indium tin oxide) film is formed as an electrode on this protective layer. Further, an alignment film (polyimide film) is formed thereon by a known method to produce a color filter.

2. Liquid crystal display

A liquid crystal display device of the present invention includes a color filter manufactured by the above-described method of manufacturing a color filter of the present invention, an opposing substrate such as a glass substrate, and a liquid crystal composition sandwiched between the color filter and the opposing substrate .

The liquid crystal display device is formed by aligning the substrate on the color filter side and the counter substrate, and sealing the liquid crystal therebetween. On the inside of the counter substrate, a TFT and a pixel electrode are formed in a matrix. An alignment film is also formed on the side of the counter substrate, and the liquid crystal molecules are arranged in a certain direction. In the case of the transmission type, the substrate and the pixel electrode are formed of a transparent material, and a polarizing plate is bonded to the outside of each substrate. In the case of the reflective type, a substrate or a pixel electrode is formed of a material having a reflective function or a reflective layer is provided on a substrate, a polarizing plate is provided on the outside of the transparent substrate, and light incident from the color filter side is reflected to perform display .

If the liquid crystal display device of the present invention is constituted by using the color filter of the present invention, conventional techniques can be appropriately used for other members.

The present invention is not limited to the above-described embodiments. The above-described embodiments are illustrative, and any of those having substantially the same structure as the technical idea described in the claims of the present invention and having the same operational effects are included in the technical scope of the present invention.

Example

Hereinafter, the present invention will be described concretely with reference to examples, but the present invention is not limited to these examples. In the following examples, evaluation methods of physical properties are as follows. In the following examples, " parts " means " parts by weight ".

≪ Preparation Example 1; Preparation of pigment dispersion for color filter >

(1) Preparation of a red pigment dispersion for a color filter

Red pigment, pigment dispersant, and organic solvent were mixed in the following proportions, 500 parts of zirconia beads having a diameter of 0.3 mm were added, and the mixture was dispersed for 4 hours using a paint shaker to obtain a pigment dispersion (R).

(Composition of pigment dispersion)

Red pigment (CI Pigment Red 254): 10 parts

Pigment dispersing agent (manufactured by AVECIA: SOLSPERS 24000): 10 parts

DPMA (dipropylene glycol methyl ether acetate; boiling point = 209 占 폚, surface tension = 27 mN / m): 80 parts

(2) Preparation of green pigment dispersion for color filter

Except that 10 parts of Green pigment (CI Pigment Green 36) and 10 parts of Yellow pigment (CI Pigment Yellow 150) were used in place of 10 parts of Red pigment (CI Pigment Red 254) in the above (1) , A pigment dispersion (G1) and a pigment dispersion (Y) were prepared. 53 parts of the pigment dispersion (G1) and 47 parts of the pigment dispersion (Y) were mixed to prepare a green pigment dispersion (G2).

(3) Preparation of blue pigment dispersion for color filter

A pigment dispersion (B) was prepared in the same manner as in Production Example 1 except that 10 parts of Blue pigment (C.I. Pigment Blue 15: 6) was used instead of 10 parts of Red pigment in the above (1).

≪ Preparation Example 2; Preparation of pigment dispersion for color filter >

(1) to (3), except that BCA (diethylene glycol butyl ether acetate boiling point = 247 캜, surface tension = 30 mN / m) was used instead of DPMA as a solvent in Production Example 1, , Green, and blue pigment dispersions were respectively prepared.

Production Example 3: Preparation of photo-curable transparent resin solution >

15 parts of polyester acryl oligomer, 15 parts of dipentaerythritol hexaacrylate (hereinafter referred to as DPHA), 20 parts of 1,6-hexanediol diacrylate, 45.5 parts of dipropylene glycol methyl ether acetate, And 0.5 parts of a photopolymerization initiator " Irgacure 369 " were mixed and then filtered using a filter having a pore diameter of 1.0 占 퐉 to obtain a transparent resin solution.

Production Example 4: Preparation of thermosetting transparent resin solution >

, 10 parts of a binder (glycidyl methacrylate styrene copolymer), 10 parts of a novolak type epoxy resin (trade name " Epicote 154 ", manufactured by Yuka Shell Co., Ltd.), 20 parts of neopentyl glycol diglycidyl ether, Trimellitic acid) and 55 parts of dipropylene glycol methyl ether acetate were mixed and filtered using a filter having a pore diameter of 1.0 占 퐉 to obtain a thermosetting transparent resin solution.

≪ Example 1; Fabrication of color filters>

A black matrix pattern having a line width of 20 mu m and a thickness of 1.6 mu m was formed by a photolithography method using a curable resin composition for black matrix on a glass substrate (manufactured by Asahi Glass Co., Ltd.) having a thickness of 0.7 mm and a size of 10 cm x 10 cm .

The blue pigment dispersion obtained in Production Example 1 was accurately and uniformly adhered to the blue pixel forming portion partitioned by the black matrix of the substrate by the ink jet method.

Next, the green pigment dispersion of Production Example 1 was accurately and uniformly adhered to the green pixel formation portion of the same substrate by the ink jet method. Next, the red pigment dispersion of Production Example 1 was accurately and uniformly adhered to the red pixel formation portion of the same substrate by the ink jet method.

After the pigment dispersion was applied, preliminary drying was performed on a hot plate at 100 DEG C for 10 minutes.

Thereafter, the transparent resin solution of Production Example 3 was adjusted so that the solid content ratio of the mixed liquid layer after curing became pigment: transparent resin = 1: 0.8 on the pigment dispersion of each color pixel formation portion partitioned by the black matrix, Lt; RTI ID = 0.0 > and evenly < / RTI > Thereafter, pre-baking was carried out on a hot plate at 180 캜 for 20 minutes, exposure was performed with a high-pressure mercury lamp at 200 mJ / cm 2 to perform photo-curing, and further curing was performed at 230 캜 for 20 minutes.

The substrate having the RGB pixel pattern formed thereon was immersed in IPA (isopropyl alcohol) for 5 minutes and then dried with IPA vapor to be cleaned. Subsequently, the substrate was cleaned at 200 ° C under vacuum of 6 × 10 ^-3 Torr, (Indium tin oxide) electrode was formed so as to have a thickness of 120 nm. The substrate having the ITO film formed thereon was further immersed in IPA for 5 minutes and then steam cleaned in IPA. Then, polyimide was spin-coated and baked at 180 DEG C for 60 minutes to form an alignment film to obtain a color filter.

≪ Example 2 >

A color filter was produced in the same manner as in Example 1 except that the transparent resin solution was applied so that the solid content ratio of the mixed liquid layer after curing became pigment: transparent resin = 1: 0.4.

≪ Example 3 >

Except that the preliminary drying after the application of the pigment dispersion for 10 minutes on a hot plate at 60 캜 and the prebaking after the application of the transparent resin solution were carried out on a hot plate at 150 캜 for 20 minutes in the color filter manufacturing process of Example 2, Color filters were fabricated in the same manner as in Example 2.

<Example 4>

The same procedure as in Example 2 was carried out except that the thermosetting transparent resin solution of Production Example 4 was used instead of the photo-curable transparent resin solution of Production Example 3 in Example 2 and the curing condition was heated at 230 占 폚 for 30 minutes To produce a color filter.

&Lt; Example 5 >

A transparent resin solution was applied so that the pigment dispersion of Production Example 2 was used in place of the pigment dispersion of Production Example 1 in Example 2 and the solid content ratio of the mixed solution layer after solidification was pigment: transparent resin = 1: 1.2 , A color filter was produced in the same manner as in Example 2.

&Lt; Example 6 >

A color filter was produced in the same manner as in Example 5 except that the transparent resin solution was applied so that the solid content ratio of the mixed liquid layer after curing became pigment: transparent resin = 1: 0.2.

&Lt; Example 7 >

The preliminary drying after the application of the pigment dispersion in Example 5 was not performed, the prebaking after the application of the transparent resin solution was carried out on a hot plate at 220 캜 for 20 minutes, and the solid content ratio after the curing of the mixed liquid layer was 1: Color filter was prepared in the same manner as in Example 5, except that the transparent resin solution was applied so that the ratio was 0.8.

&Lt; Example 8 >

Example 7 was repeated except that the thermosetting transparent resin solution of Production Example 4 was used instead of the photo-curable transparent resin solution of Production Example 3, and the curing condition was heated at 230 占 폚 for 30 minutes. The color filter was produced by the method.

Production Example 5: Preparation of pigment inkjet ink for color filter>

(1) Preparation of red inkjet ink for color filter

Red pigment, pigment dispersant, and organic solvent were mixed in the following proportions, 500 parts of zirconia beads having a diameter of 0.3 mm were added, and the mixture was dispersed for 4 hours using a paint shaker to obtain a pigment dispersion (R). 50 parts of the obtained pigment dispersion (R), 10 parts of polyester acryl oligomer, 10 parts of DPHA, 20 parts of 1,6-hexanediol diacrylate, 9.5 parts of DPMA, and a photopolymerization initiator &quot; Irgacure 369 &quot;, manufactured by Ciba Specialty Chemicals, , And the mixture was filtered using a filter having a pore diameter of 1.0 탆 to obtain a red inkjet ink for a color filter.

(Composition of pigment dispersion)

Red pigment (CI Pigment Red 254): 20 parts

Pigment dispersant (manufactured by AVECIA: SOLSPERS 24000): 15 parts

DPMA (dipropylene glycol methyl ether acetate: 65 parts

(2) Preparation of green inkjet ink for color filter

20 parts of Green pigment (CI Pigment Green 36) and 20 parts of Yellow pigment (CI Pigment Yellow 150) were used in place of 20 parts of Red pigment (CI Pigment Red 254) used in preparation of inkjet ink of Production Example 5 (1) A green pigment dispersion and a yellow pigment dispersion were prepared in the same manner. 53 parts of a green pigment dispersion and 47 parts of a yellow pigment dispersion were mixed to prepare a green pigment dispersion (G). Using the obtained green pigment dispersion (G), a green inkjet ink was prepared in the same manner as the red inkjet ink of the above (1).

(3) Preparation of blue inkjet ink for color filter

A blue pigment dispersion was prepared in the same manner as in Production Example 5 (1) except that 10 parts of Blue pigment (CI Pigment Blue 15: 6) was used instead of 20 parts of Red pigment (CI Pigment Red 254). Using the obtained blue pigment dispersion, a blue inkjet ink was prepared in the same manner as the red inkjet ink of (1) above.

Production Example 6: Preparation of pigment inkjet ink for color filter>

(1) Preparation of red inkjet ink for color filter

Red pigments, pigment dispersants and organic solvents were mixed in the following proportions, 500 parts of zirconia beads having a diameter of 0.3 mm were added and dispersed for 4 hours using a paint shaker to obtain a pigment dispersion. 50 parts of the obtained pigment dispersion, 10 parts of polyester acryl oligomer, 10 parts of DPHA, 20 parts of 1,6-hexanediol diacrylate, 9.5 parts of DPMA, and 0.5 parts of Irgacure 369, a photopolymerization initiator manufactured by Ciba Specialty Chemicals, Thereafter, the mixture was filtered using a filter having a pore diameter of 1.0 mu m to obtain a red inkjet ink for a color filter.

(Composition of pigment dispersion)

Red pigment (CI Pigment Red 254): 15 parts

Pigment dispersant (manufactured by AVECIA: SOLSPERS 24000): 15 parts

DPMA (70 parts of dipropylene glycol methyl ether acetate

(2) Preparation of green inkjet ink for color filter

Except that 15 parts of Green pigment (CI Pigment Green 36) and 15 parts of Yellow pigment (CI Pigment Yellow 150) were used instead of 15 parts of Red pigment (CI Pigment Red 254) of Production Example 6 (1) To prepare a pigment dispersion (G1) and a pigment dispersion (Y). 53 parts of the pigment dispersion (G1) and 47 parts of the pigment dispersion (Y) were mixed to prepare a pigment dispersion (G2). Using the obtained pigment dispersion (G2), a green inkjet ink was prepared in the same manner as the red inkjet ink.

(3) Preparation of blue inkjet ink for color filter

A pigment dispersion liquid was prepared in the same manner as in Production Example 6 (1) except that 15 parts of Red pigment (C.I. Pigment Red 254) was replaced by 15 parts of Blue pigment (C.I. Pigment Blue 15: 6). Using the obtained pigment dispersion, a blue ink-jet ink was prepared in the same manner as the above red ink-jet ink.

&Lt; Comparative Example 1 &

The blue inkjet ink of Production Example 5 was accurately and uniformly adhered to the blue pixel forming portion partitioned by the black matrix of the same substrate as in Example 1 by the inkjet method. Next, the green inkjet ink of Production Example 5 was accurately and uniformly adhered to the green pixel formation portion of the same substrate by the inkjet method. Next, the red inkjet ink of Production Example 5 was accurately and uniformly adhered to the red pixel formation portion of the same substrate by the inkjet method. Thereafter, pre-baking was carried out on a 180 ° C hot plate for 20 minutes, exposure was performed at 200 mJ / cm 2 using a high-pressure mercury lamp, and the resultant was cured at 230 ° C for 20 minutes.

The substrate on which the RGB pixel pattern was formed was immersed in IPA for 5 minutes and then dried with IPA vapor to be cleaned. Subsequently, ITO (indium tin oxide) was deposited under a vacuum of 6 × 10 ^-3 Torr at a substrate setting temperature of 200 ° C., An electrode was formed to have a thickness of 120 nm. The substrate having the ITO film formed thereon was further immersed in IPA for 5 minutes and then steam cleaned in IPA. Then, polyimide was spin-coated and baked at 180 DEG C for 60 minutes to form an alignment film to obtain a color filter.

&Lt; Comparative Example 2 &

A color filter was produced in the same manner as in Comparative Example 1 except that the inkjet ink of Production Example 6 was used instead of the inkjet ink of Production Example 5 in the production of Comparative Example 1. [

[Assessment Methods]

The viscosity and discharge stability of the pigment dispersion, transparent resin solution and inkjet ink (pigment ink) obtained in Production Examples 1 to 6 were evaluated by the following methods. The color filters produced in Examples 1 to 8 and Comparative Examples 1 and 2 were evaluated for the presence or absence of knockout, presence or absence of color mixture, film thickness, and chromaticity by the following methods.

(1) Viscosity

(VM-1G, manufactured by Yamaichi Denki K.K.) at 23 占 폚.

(2) Discharge stability

The pigment dispersion liquid, the transparent resin solution, and the inkjet ink obtained in the above Examples and Comparative Examples were sprayed once onto the paper for photographic printing so that the droplet size was 15 pL, followed by waiting for 5 minutes and again spraying twice, After waiting for minutes, it was sprayed again three times. This repetition process was repeated 4 times and the printed ink was visually analyzed to evaluate the clogging of the nozzle. ? Indicates that there is no change compared with the initial state,? Indicates that no partial printing is performed, and X indicates that no printing is performed.

(3) Knockout and color mixing

The color filter 1 produced in each of the steps of Examples 1 to 8 and Comparative Examples 1 and 2 was evaluated by counting the number of defect points (knockout, color mixture) per 100,000 parts with eyes.

(4) Thickness

The fabricated color filter was observed with a laser microscope (manufactured by Olympus Corporation), and the film thickness was measured.

(5) Chromaticity

The chromaticity of each colored layer of the produced color filter was measured using a microscopic spectrophotometric apparatus (trade name: "PMA-11", manufactured by Hamamatsu Photonics Co., Ltd.).

[Evaluation results]

(1) Evaluation of ink and the like

Table 1 shows the results of evaluation of the pigment concentration, viscosity, and inkjet discharge stability of the pigment dispersions, transparent resin solutions (transparent resin composition) and inkjet inks (pigment inks) obtained in Production Examples 1 to 6. It can be seen that the pigment dispersion and the transparent resin solution have a lower viscosity than the pigment ink and the ejection in the ink jet is also good.

(2) Evaluation of color filters

Table 2 shows the results of evaluating the presence or absence of knockout, the presence or absence of color mixing, the film thickness, and the chromaticity of the color filters produced in Examples 1 to 8 and Comparative Examples 1 and 2. In the color filter manufactured in Comparative Example 1, knockout due to the ink nozzle dropout was observed, and in the color filter manufactured in Comparative Example 2, the color mixture resulting from pushing out the ink was observed. In the color filters produced in Examples 1 to 8 No color mixing, no knockout.

In Table 2, &quot; drying temperature (A) &quot; means the drying temperature in the pre-drying step after the application of the pigment dispersion and the &quot; drying temperature (B) Temperature).

The &quot; solid content ratio &quot; means the ratio of the solid content of the pigment dispersion and the transparent resin solution after drying (solid content ratio of pigment and transparent resin after hardening the mixed liquid layer = pigment: transparent resin). The &quot; boiling point of solvent &quot; indicates the boiling point of the dispersion solvent of the pigment dispersion.

Industrial availability

According to the present invention, since a color filter having high color purity and color reproducibility can be manufactured using inkjet ink excellent in straightness and stability when ejected from a head, . Particularly, it is possible to manufacture a color filter in which a pixel portion with a high transmittance density and uniformity, and no color separation is precisely formed, and a luminance is improved. By using the color filter of excellent performance obtained by the method of the present invention, a liquid crystal display element having excellent color display characteristics can be provided at a high yield, and a high quality liquid crystal display device can be manufactured.

Claims (9)

 A step of selectively applying a pigment dispersion to the gap between the transparent substrate and the transparent substrate by an inkjet method (pigment dispersion coating step); and a step of applying a transparent resin solution to the gap of the boundary after the pigment dispersion coating step (A transparent resin solution application step) of mixing the pigment dispersion and the transparent resin solution in the gap, and a step of curing the mixed solution layer of the pigment dispersion and the transparent resin solution formed in the transparent resin solution application step Wherein the step of forming the color filter comprises the steps of: The method of producing a color filter according to claim 1, wherein a thickness of the colored liquid layer formed in the step of applying the pigment dispersion is 0.4 to 2 탆. The method of manufacturing a color filter according to claim 1 or 2, wherein the mixed liquid layer is formed to have the same film thickness as the boundary portion. The method for producing a color filter according to claim 1 or 2, wherein in the step of applying the pigment dispersion, the colored liquid layer formed by applying the pigment dispersion is dried at a temperature of 40 to 160 캜. The method for producing a color filter according to claim 1 or 2, wherein the mixed liquid layer obtained by mixing the pigment dispersion and the transparent resin solution in the transparent resin solution applying step is dried at a temperature of 80 to 200 캜. The method of producing a color filter according to claim 1 or 2, wherein a solid content ratio of the pigment to the transparent resin in the mixed liquid layer after curing the mixed liquid layer is 1: 0.4 to 1. The method for producing a color filter according to claim 1 or 2, wherein the pigment dispersion comprises at least a pigment, a pigment dispersant, and a solvent, and the boiling point of the solvent is 200 ° C or higher. The method for producing a color filter according to claim 1 or 2, wherein the transparent resin composition contained in the transparent resin solution is a photo-curable resin composition. delete