Pigment dispersion liquid, photoresist composition, photosensitive glass and liquid crystal display device

Abstract

The invention provides a pigment dispersion liquid, a photoresist composition, photosensitive glass and a liquid crystal display device, and relates to the field of liquid crystal display devices. The pigment dispersion includes a black colorant; the black coloring agent comprises carbon black A and carbon black B; the oil absorption value of the carbon black A is 80 mL / 100 g to 100 mL / 100 g; and the oil absorption value of the carbon black B is 50 mL / 100 g to 70 mL / 100 g. By using the carbon black A and the carbon black B with different oil absorption values as the coloring agents, the black matrix pixel with excellent pixel edge collimation and good cross section slope angle can still be obtained even under the conditions of higher pigment filling amount and narrower line width.

Description

Technical Field

[0001] The present application relates to the field of liquid crystal display devices, and in particular to a pigment dispersion, a photoresist composition, a photosensitive glass and a liquid crystal display device. Background Art

[0002] In the screen display area of ​​the liquid crystal display device, a light-shielding film layer (black matrix) is provided, which is mainly used to prevent the leakage from the backlight and reflect into the screen, and to prevent the bleeding caused by the confusion of different colors of light and reflect into the screen, thereby helping to improve the display characteristics (contrast and color purity).

[0003] With the development of display technology, the black matrix requires higher light-shielding properties, narrower line widths and good engineering matching. However, as the amount of colorant added continues to increase, poor pixel edge alignment and difficult-to-control slope angles are prone to occur during the process of manufacturing the black matrix, resulting in the color film layer and the black matrix not matching properly, resulting in peeling, residue and other problems, which greatly affect the display effect of the device. Summary of the invention

[0004] The purpose of the present application is to provide a pigment dispersion, a photoresist composition, a photosensitive glass and a liquid crystal display device to solve the above problems.

[0005] To achieve the above objectives, the present application provides a first aspect of a pigment dispersion, including a black colorant;

[0006] The black colorant includes carbon black A and carbon black B;

[0007] The oil absorption value of the carbon black A is 80mL / 100g-100mL / 100g;

[0008] The oil absorption value of the carbon black B is 50 mL / 100 g to 70 mL / 100 g.

[0009] Optionally, the pigment dispersion satisfies at least one of the following conditions:

[0010] A. The mass ratio of the carbon black A to the carbon black B is 5-80:20-95;

[0011] B. The particle sizes of the carbon black A and the carbon black B are independently 20nm-60nm;

[0012] C. the pH of the carbon black A is 2-5;

[0013] D. the pH of the carbon black B is 2-5;

[0014] E. The raw materials of the pigment dispersion liquid, calculated by mass as 100%, include:

[0015] Carbon black A 10%-70%, carbon black B 10%-70%, dispersant 5%-65%, first alkali-soluble resin 5%-65%, first organic solvent 10%-70%.

[0016] Optionally, the pigment dispersion satisfies at least one of the following conditions:

[0017] A. The mass ratio of the carbon black A to the carbon black B is 10-70:30-90.

[0018] B. the dispersant comprises a carbamate polymer dispersant and / or an acrylic polymer dispersant;

[0019] C. the first alkali-soluble resin comprises an alkali-soluble Cardo resin and / or an acrylic copolymer resin;

[0020] D. The first organic solvent includes one or more of ether organic solvents, ether ester organic solvents, ketone organic solvents, alcohol solvents, and nitrogen-containing organic solvents.

[0021] The second aspect of the present application provides a photoresist composition, wherein the raw materials thereof, calculated by mass as 100%, include:

[0022] The pigment dispersion comprises 10%-70%, a second alkali-soluble resin 5%-45%, a photopolymerization initiator 0.2%-5%, a photopolymerizable compound 0.2%-50%, and a second organic solvent 10%-50%.

[0023] Optionally, the second alkali-soluble resin includes an alkali-soluble Cardo resin and / or an acrylic copolymer resin.

[0024] Optionally, the photopolymerization initiator includes 1-[9-ethyl-6-(2-methylbenzoyl)-9H-carbazole-3-yl]ethanone 1-(O-acetoxime), benzophenone, 4,4'-di(N,N-diethylamino)benzophenone, 4-methoxy-4'-dimethylaminobenzophenone, 2,2-diethoxyacetophenone, benzoin, benzoin methyl ether, benzoin isobutyl ether, benzyl dimethyl ketal, α-hydroxyisobutylbenzophenone, thioxanthone, One or more of 2-chlorothioxanthone, 1-hydroxycyclohexylbenzophenone, tert-butylanthraquinone, 1-chloroanthraquinone, 2,3-dichloroanthraquinone, 3-chloro-2-methylanthraquinone, 2-ethylanthraquinone, 1,4-naphthoquinone, 1,2-benzoquininone, 1,4-dimethylanthraquinone, 2-phenylanthraquinone, 2-methyl-1-(4-methylthiophenyl)-2-morpholinyl-1-propanone, and 2-methyl-1[4-(methylthio)phenyl]-2-morpholinylpropane-1-one.

[0025] Optionally, the photopolymerizable compound includes an acrylic compound and / or a methacrylate compound, and the acrylic compound and the methacrylate compound each independently contain three or more ethylenically unsaturated groups and satisfy at least one of the following conditions:

[0026] A. The acrylic compound includes one or more of pentaerythritol triacrylate, pentaerythritol tetraacrylate, sorbitol triacrylate, sorbitol tetraacrylate, sorbitol pentaacrylate, sorbitol hexaacrylate, trimethylolpropane triacrylate, dipentaerythritol pentaacrylate, and dipentaerythritol hexaacrylate;

[0027] B. The methacrylate compound includes one or more of trimethylolpropane trimethacrylate, trimethylolethane trimethacrylate, pentaerythritol trimethacrylate, pentaerythritol tetramethacrylate, dipentaerythritol hexamethacrylate, sorbitol trimethacrylate, and sorbitol tetramethacrylate.

[0028] Optionally, the second organic solvent includes one or more of ether organic solvents, ether ester organic solvents, ketone organic solvents, alcohol solvents, and nitrogen-containing organic solvents.

[0029] The third aspect of the present application provides a photosensitive glass, comprising the photoresist composition.

[0030] A fourth aspect of the present application provides a liquid crystal display device, comprising the photosensitive glass.

[0031] Compared with the prior art, the beneficial effects of this application include:

[0032] The pigment dispersion provided by the present application uses two carbon blacks A and B with different oil absorption values ​​as colorants. The carbon black with a smaller oil absorption value has poor adsorption capacity for solvents, alkali-soluble resins, and nearby carbon black particles, and is more easily dissolved by alkali solution during the development process, resulting in local shedding, and the edge becomes more irregular. In addition, when the film layer is heated and softened during the post-curing process, it is more likely to flow, resulting in a worse slope angle and an aggravated edge jagged phenomenon. The carbon black with a larger oil absorption value has a strong adsorption capacity for alkali-soluble resins and nearby carbon black particles, has less fluidity in the film layer, has poor dispersion performance, is not easily dissolved by alkali solution during the development process, and results in increased residues, and even The film layer cannot fall off, so introducing carbon black with a larger oil absorption value into carbon black with a smaller oil absorption value can play a supporting role in the film layer, reduce the fluidity of the film layer, effectively improve the edge alignment, and optimize the developability. Carbon black with a large oil absorption value has strong adsorption and can serve as a support to improve the edge jaggedness caused by excessive development of carbon black with a small oil absorption value. At the same time, carbon black with a small oil absorption value is easily soluble and can improve the poor development of carbon black with a large oil absorption value. By using carbon black A and carbon black B with two different oil absorption values ​​as colorants, even at a higher pigment filling amount and a narrower line width, black matrix pixels with excellent pixel edge alignment and good cross-sectional slope angle can still be obtained.

[0033] The photoresist composition provided by the present application has excellent pixel edge alignment and cross-sectional angle.

[0034] The photosensitive glass and liquid crystal display device provided in the present application have good light-shielding effect. DETAILED DESCRIPTION

[0035] As used herein:

[0036] "Prepared from" is synonymous with "comprising." As used herein, the terms "comprising," "including," "having," "containing," or any other variation thereof, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus that comprises the listed elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.

[0037] The conjunction "consisting of excludes any unspecified element, step, or component. If used in a claim, this phrase renders the claim closed-ended so that it does not include materials other than those described, except for conventional impurities associated therewith. When the phrase "consisting of" appears in a clause of the body of a claim rather than immediately following the subject matter, it limits only the elements described in that clause; other elements are not excluded from the claim as a whole.

[0038] When an amount, concentration, or other value or parameter is expressed as a range, a preferred range, or a range defined by a series of upper preferred values ​​and lower preferred values, this should be understood as specifically disclosing all ranges formed by any pairing of any range upper limit or preferred value with any range lower limit or preferred value, regardless of whether the range is disclosed separately. For example, when a range of "1 to 5" is disclosed, the described range should be interpreted as including ranges "1 to 4", "1 to 3", "1 to 2", "1 to 2 and 4 to 5", "1 to 3 and 5", etc. When a numerical range is described in this article, unless otherwise stated, the range is intended to include its end values ​​and all integers and fractions within the range.

[0039] In these examples, parts and percentages are by mass unless otherwise indicated.

[0040] "Parts by mass" refers to the basic unit of measurement for expressing the mass ratio of multiple components. 1 part can represent any unit mass, such as 1g or 2.689g. If we say that the mass of component A is a parts and the mass of component B is b parts, it means the ratio of the mass of component A to the mass of component B is a:b. Alternatively, it means that the mass of component A is aK and the mass of component B is bK (K is an arbitrary number, indicating a multiple factor). It should not be misunderstood that, unlike the mass parts, the sum of the mass of all components is not limited to 100 parts.

[0041] "And / or" is used to indicate that one or both of the stated situations may occur, for example, A and / or B includes (A and B) and (A or B).

[0042] A first aspect of the present application provides a pigment dispersion, including a black colorant;

[0043] The black colorant includes carbon black A and carbon black B;

[0044] The oil absorption value of the carbon black A is 80mL / 100g-100mL / 100g;

[0045] Optionally, the oil absorption value of carbon black A can be 80 mL / 100 g, 85 mL / 100 g, 90 mL / 100 g, 95 mL / 100 g, 100 mL / 100 g or any value between 80 mL / 100 g and 100 mL / 100 g;

[0046] The oil absorption value of the carbon black B is 50 mL / 100 g to 70 mL / 100 g.

[0047] Optionally, the oil absorption value of carbon black B can be 50 mL / 100 g, 55 mL / 100 g, 60 mL / 100 g, 65 mL / 100 g, 70 mL / 100 g or any value between 50 mL / 100 g and 70 mL / 100 g.

[0048] In some embodiments, the pigment dispersion satisfies at least one of the following conditions:

[0049] A. The mass ratio of the carbon black A to the carbon black B is 5-80:20-95;

[0050] Optionally, the mass ratio of carbon black A to carbon black B can be 5:20, 5:30, 5:50, 5:70, 5:90, 5:95, 10:30, 30:30, 40:30, 50:30, 60:30, 70:30, 80:20, or any value between 5-80:20-95;

[0051] It should be noted that when the mass ratio of carbon black A to carbon black B is higher than 80:20, the system viscosity is high, the storage stability is poor, and the surface roughness is aggravated; when the mass ratio of carbon black A to carbon black B is lower than 5:95, the edge improvement effect is not obvious;

[0052] B. The particle sizes of the carbon black A and the carbon black B are independently 20nm-60nm;

[0053] Optionally, the particle sizes of carbon black A and carbon black B can be independently 20 nm, 30 nm, 40 nm, 50 nm, 60 nm or any value between 20 nm and 60 nm;

[0054] C. the pH of the carbon black A is 2-5;

[0055] Optionally, the pH of carbon black A may be 2, 3, 4, 5 or any value between 2 and 5;

[0056] D. the pH of the carbon black B is 2-5;

[0057] Optionally, the pH of carbon black B may be 2, 3, 4, 5 or any value between 2 and 5;

[0058] E. The raw materials of the pigment dispersion liquid, calculated by mass as 100%, include:

[0059] Carbon black A 10%-70%, carbon black B 10%-70%, dispersant 5%-65%, first alkali-soluble resin 5%-65%, first organic solvent 10%-70%.

[0060] Optionally, the raw materials of the pigment dispersion are 100% by mass, carbon black A can be 10%, 20%, 30%, 40%, 50%, 60%, 70% or any value between 10% and 70%, carbon black B can be 10%, 20%, 30%, 40%, 50%, 60%, 70% or any value between 10% and 70%, the dispersant can be 5%, 10%, 20%, 30%, 40%, 50%, 60%, 65%, the first alkali-soluble resin can be 5%, 10%, 20%, 30%, 40%, 50%, 60%, 65%, and the first organic solvent can be 10%, 20%, 30%, 40%, 50%, 60%, 70% or any value between 10% and 70%.

[0061] Preferably, the raw materials of the pigment dispersion liquid, calculated by mass as 100%, include:

[0062] Carbon black A 20%-60%, carbon black B 20%-60%, dispersant 5%-45%, first alkali-soluble resin 5%-45%, first organic solvent 10%-50%.

[0063] Further preferably, the raw materials of the pigment dispersion liquid, calculated by mass as 100%, include:

[0064] Carbon black A 20%-50%, carbon black B 20%-50%, dispersant 5%-35%, first alkali-soluble resin 5%-35%, first organic solvent 20%-50%.

[0065] In some embodiments, the pigment dispersion satisfies at least one of the following conditions:

[0066] A. The mass ratio of the carbon black A to the carbon black B is 10-70:30-90;

[0067] Optionally, the mass ratio of carbon black A to carbon black B can be 10:30, 10:35, 10:45, 10:55, 10:65, 10:75, 10:85, 20:30, 30:30, 40:30, 50:30, 60:30, 70:30 or any value between 10-70:30-90;

[0068] B. the dispersant comprises a carbamate polymer dispersant and / or an acrylic polymer dispersant;

[0069] C. the first alkali-soluble resin comprises an alkali-soluble Cardo resin and / or an acrylic copolymer resin;

[0070] It should be noted that the first alkali-soluble resin has alkali-soluble groups such as carboxyl, hydroxyl, and acid anhydride, which can improve the developability and pattern formability. In addition, the alkali-soluble resin can also be used as a binder and dispersant, acting as a binder relative to the above-mentioned black colorant, and is soluble in the developer used in its development treatment process when manufacturing the black matrix, especially the alkaline developer.

[0071] D. The first organic solvent includes one or more of ether organic solvents, ether ester organic solvents, ketone organic solvents, alcohol solvents, and nitrogen-containing organic solvents.

[0072] Wherein, the boiling point of the first organic solvent is 100° C.-200° C.; preferably, the first organic solvent includes propylene glycol monomethyl ether acetate.

[0073] It should be noted that when preparing the carbon black A and carbon black B composition, the components can be formulated uniformly or they can be dissolved and dispersed in a solvent and then formulated in sequence. Furthermore, the order of formulation and the operating conditions are not particularly limited. For example, all the components can be dissolved and dispersed in a solvent at the same time to prepare the composition. As needed, the components can be appropriately prepared as two or more solutions and dispersions, and these solutions and dispersions can be mixed to prepare the composition when used (when applied).

[0074] Furthermore, it is preferred that carbon black is dispersed together with other components such as a resin, an organic solvent, and a pigment derivative to prepare a pigment dispersion, and the obtained pigment dispersion is mixed with other components of the coloring composition as required.

[0075] The pigment dispersion can be prepared by dispersing a carbon black with a smaller oil absorption value and a carbon black with a larger oil absorption value separately, or by dispersing the carbon black with a smaller oil absorption value and the carbon black with a larger oil absorption value at the same time (co-dispersion). Co-dispersion is preferred. According to this method, the dispersion stability of the carbon black compound can be improved.

[0076] When preparing the composition of carbon black A and carbon black B, it is preferred to filter through a filter for the purpose of removing impurities and reducing defects. As a filter, any filter that has been used for filtering purposes in the past can be used without particular limitation. Examples include filters using raw materials such as fluororesins such as polytetrafluoroethylene (PTFE), polyamide resins such as nylon (such as nylon-6, nylon-6,6), and polyolefin resins such as polyethylene and polypropylene (PP) (including high-density, ultra-high molecular weight polyolefin resins). Among these raw materials, polypropylene (including high-density polypropylene) and nylon are preferred.

[0077] The pore size of the filter is preferably about 0.01μm-7.0μm, preferably about 0.01μm-3.0μm, and more preferably about 0.05μm-0.5μm. By setting it to this range, fine impurities that hinder the preparation of a uniform and smooth composition can be reliably removed in the later steps. In addition, it is also preferred to use fibrous filter materials. As filter materials, for example, polypropylene fibers, nylon fibers, glass fibers, etc. can be cited.

[0078] When using filters, different filters may be combined; in this case, filtering in the first filter may be performed only once or twice or more.

[0079] Furthermore, within the above range, first filters with different pore diameters may be combined. Here, the pore diameter may refer to the nominal value of the filter manufacturer.

[0080] The second filter may be made of the same material as the first filter.

[0081] For example, filtration through the first filter may be performed using only the dispersion, or the second filtration may be performed after mixing other components.

[0082] The second aspect of the present application provides a photoresist composition, wherein the raw materials thereof, calculated by mass as 100%, include:

[0083] The pigment dispersion comprises 10%-70%, a second alkali-soluble resin 5%-45%, a photopolymerization initiator 0.2%-5%, a photopolymerizable compound 0.2%-50%, and a second organic solvent 10%-50%.

[0084] Optionally, the raw materials of the photoresist composition, calculated by mass as 100%, include:

[0085] The pigment dispersion may be 10%, 20%, 30%, 40%, 50%, 60%, 70% or any value between 10% and 70%, the second alkali-soluble resin may be 5%, 10%, 20%, 30%, 40%, 45% or any value between 5% and 45%, the photopolymerization initiator may be 0.2%, 0.5%, 1%, 2%, 4%, 5% or any value between 0.2% and 5%, the photopolymerizable compound may be 0.2%, 1%, 5%, 10%, 20%, 30%, 40%, 50% or any value between 0.2% and 45%, and the second organic solvent may be 10%, 20%, 30%, 40%, 50% or any value between 10% and 50%.

[0086] In some embodiments, the second alkali-soluble resin includes an alkali-soluble Cardo resin and / or an acrylic copolymer resin.

[0087] In some embodiments, the photopolymerization initiator includes 1-[9-ethyl-6-(2-methylbenzoyl)-9H-carbazole-3-yl]ethanone 1-(O-acetoxime), benzophenone, 4,4'-di(N,N-diethylamino)benzophenone, 4-methoxy-4'-dimethylaminobenzophenone, 2,2-diethoxyacetophenone, benzoin, benzoin methyl ether, benzoin isobutyl ether, benzyl dimethyl ether, One or more of ketone, α-hydroxyisobutylbenzophenone, thioxanthone, 2-chlorothioxanthone, 1-hydroxycyclohexylbenzophenone, tert-butylanthraquinone, 1-chloroanthraquinone, 2,3-dichloroanthraquinone, 3-chloro-2-methylanthraquinone, 2-ethylanthraquinone, 1,4-naphthoquinone, 1,2-benzoquininone, 1,4-dimethylanthraquinone, 2-phenylanthraquinone, 2-methyl-1-(4-methylthiophenyl)-2-morpholinyl-1-propanone.

[0088] It should be noted that photopolymerization initiators can generate free radical active species through bond cleavage and / or reaction by exposure. Through the free radical active species, compounds with more than two free radical polymerizing groups can be photocured to form a pattern. Photopolymerization initiators also include cationic photopolymerization initiators, which can decompose into cations or proton acids under the action of light, thereby initiating cationic polymerization reactions to form patterns.

[0089] In some embodiments, the photopolymerizable compound includes an acrylic compound and / or a methacrylate compound, wherein the acrylic compound and the methacrylate compound each independently contain three or more ethylenically unsaturated groups and satisfy at least one of the following conditions:

[0090] A. The acrylic compound includes one or more of pentaerythritol triacrylate, pentaerythritol tetraacrylate, sorbitol triacrylate, sorbitol tetraacrylate, sorbitol pentaacrylate, sorbitol hexaacrylate, trimethylolpropane triacrylate, dipentaerythritol pentaacrylate, and dipentaerythritol hexaacrylate;

[0091] B. The methacrylate compound includes one or more of trimethylolpropane trimethacrylate, trimethylolethane trimethacrylate, pentaerythritol trimethacrylate, pentaerythritol tetramethacrylate, dipentaerythritol hexamethacrylate, sorbitol trimethacrylate, and sorbitol tetramethacrylate.

[0092] Note that, further, a cured product obtained by polymerization of the photopolymerizable compound (monomer) is finally filled in the film of the pixel as an acrylic resin component in the alkali-soluble resin.

[0093] In some embodiments, the second organic solvent includes one or more of an ether organic solvent, an ether ester organic solvent, a ketone organic solvent, an alcohol solvent, and a nitrogen-containing organic solvent.

[0094] It should be noted that the boiling point of the second organic solvent is 100° C.-200° C.; preferably, the second organic solvent includes propylene glycol monomethyl ether acetate (PMA).

[0095] In some embodiments, the ether organic solvent includes one or more of ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monoisopropyl ether, ethylene glycol monobutyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol monobutyl ether, diethylene glycol diethyl ether, diethylene glycol dimethyl ether, and diethylene glycol methyl ethyl ether.

[0096] In some embodiments, the ether ester organic solvent includes one or more of ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate, ethylene glycol monobutyl ether acetate, propylene glycol monomethyl ether acetate, and propylene glycol monoethyl ether acetate.

[0097] In some embodiments, the ketone organic solvent includes one or more of methyl isobutyl ketone, cyclohexanone, 2-heptanone, and delta-butyrolactone.

[0098] In some embodiments, the alcohol solvent includes ester organic solvents such as methyl 2-hydroxypropionate, ethyl 2-hydroxypropionate, ethyl 2-hydroxy-2-methylpropionate, 3-methyl-3-methoxybutyl propionate, methyl 3-methoxypropionate, ethyl 3-methoxypropionate, methyl 3-ethoxypropionate, ethyl 3-ethoxypropionate, ethyl ethoxyacetate, ethyl hydroxyacetate, and n-pentyl formate; or one or more of methanol, ethanol, isopropanol, and butanol.

[0099] In some embodiments, the nitrogen-containing organic solvent includes one or more of N-methylpyrrolidone, N,N-dimethylformamide, and N,N-dimethylacetamide.

[0100] The third aspect of the present application provides a photosensitive glass, comprising the photoresist composition.

[0101] A fourth aspect of the present application provides a liquid crystal display device, comprising the photosensitive glass.

[0102] The embodiments of the present application will be described in detail below in conjunction with specific examples, but it will be appreciated by those skilled in the art that the following examples are only used to illustrate the present application and should not be considered as limiting the scope of the present application. If specific conditions are not specified in the examples, they are carried out according to normal conditions or the conditions recommended by the manufacturer. If the manufacturer is not specified for the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0103] The raw materials used in the examples and comparative examples can all be obtained from commercial sources, and information on some of the raw materials is as follows:

[0104] Carbon Black:

[0105] MA-100, pH 3.5, average primary particle size 24 nm, DBP oil absorption 100 mL / 100 g, manufactured by Mitsubishi Chemical Corporation;

[0106] MA-8, pH 3.0, average primary particle size 24 nm, DBP oil absorption 57 mL / 100 g, manufactured by Mitsubishi Chemical Corporation;

[0107] Dispersant: DISPERBYK 161, solid content 30%, manufactured by BYK Chemical;

[0108] Resin: RD-SV-200, solid content 40%, manufactured by Nippon Catalyst;

[0109] Organic solvents: PGMEA (propylene glycol monomethyl ether acetate), PMA;

[0110] Photopolymerization initiator: OXE 01, manufactured by BASF;

[0111] Photopolymerizable compound (monomer): DPHA (dipentaerythritol hexaacrylate), manufactured by Nippon Kayaku Co., Ltd.

[0112] Example 1

[0113] In a first aspect of the present embodiment, a pigment dispersion is provided, named as pigment dispersion-1, wherein the raw materials of the pigment dispersion-1 are MA-100, MA-8, dispersant DISPERBYK 161, alkali-soluble resin: RD-SV-200, and organic solvent PGMEA (propylene glycol monomethyl ether acetate);

[0114] The preparation method of pigment dispersion-1 is: the above raw materials are mixed and kneaded for 5 hours using a bead mill (NANO-3000-10 high-pressure disperser with a decompression mechanism, manufactured by Mei Li Co., Ltd.), wherein the amount of pigment dispersion-1 used can be seen in Table 1.

[0115] This embodiment also provides a photoresist composition and a preparation method thereof. The raw materials of the photoresist composition include the above-mentioned pigment dispersion liquid-1, resin RD-SV-200, photopolymerization initiator OXE 01, photopolymerizable compound (monomer) DPHA (dipentaerythritol hexaacrylate), and organic solvent PMA.

[0116] The preparation method is as follows: under yellow light laboratory, the above raw materials are mixed, stirred for 4 hours, and filtered through a filter element with a pore size of 0.5 um. The amount of each raw material is shown in Table 2.

[0117] Example 2

[0118] This embodiment provides a pigment dispersion, named pigment dispersion-2, which is different from embodiment 1 in that the amount of raw materials used in pigment dispersion-2 is different.

[0119] This embodiment also provides a photoresist composition, which is prepared in the same manner as in Embodiment 1, except that the pigment dispersion liquid-1 is replaced by the pigment dispersion liquid-2 prepared in this embodiment.

[0120] Example 3

[0121] This embodiment provides a pigment dispersion, named pigment dispersion-3, which is different from embodiment 1 in that the amount of raw materials used in pigment dispersion-3 is different.

[0122] This embodiment also provides a photoresist composition, which is prepared in the same manner as in Embodiment 1, except that the pigment dispersion liquid-1 is replaced by the pigment dispersion liquid-3 prepared in this embodiment.

[0123] Example 4

[0124] This embodiment provides a pigment dispersion, named pigment dispersion-4, which is different from embodiment 1 in that the amount of raw materials used in pigment dispersion-4 is different.

[0125] This embodiment also provides a photoresist composition, which is prepared in the same manner as in Embodiment 1, except that the pigment dispersion liquid-1 is replaced by the pigment dispersion liquid-4 prepared in this embodiment.

[0126] Example 5

[0127] This embodiment provides a pigment dispersion, named pigment dispersion-5, which is different from embodiment 1 in that the amount of raw materials used in pigment dispersion-5 is different.

[0128] This embodiment also provides a photoresist composition, which is prepared in the same manner as in Embodiment 1, except that the pigment dispersion liquid-1 is replaced by the pigment dispersion liquid-5 prepared in this embodiment.

[0129] Comparative Example 1

[0130] This comparative example provides a pigment dispersion, named as pigment dispersion-6, which is different from Example 1 in that the amount of raw materials used in pigment dispersion-4 is different, and the mass ratio of MA-100 to MA-8 is 22.5:2.5.

[0131] This comparative example also provides a photoresist composition, which is prepared in the same manner as in Example 1, except that the pigment dispersion liquid-1 is replaced by the pigment dispersion liquid-6 prepared in this comparative example.

[0132] Comparative Example 2

[0133] This comparative example provides a pigment dispersion, named as pigment dispersion-7, which is different from Example 1 in that the amount of raw materials used in pigment dispersion-5 is different, and the mass ratio of MA-100 to MA-8 is 1:24.

[0134] This comparative example also provides a photoresist composition, which is prepared in the same manner as in Example 1, except that the pigment dispersion liquid-1 is replaced by the pigment dispersion liquid-7 prepared in this comparative example.

[0135] Comparative Example 3

[0136] This comparative example provides a pigment dispersion, named as pigment dispersion-8, which is different from Example 1 in that pigment dispersion-7 does not contain MA-100.

[0137] This comparative example also provides a photoresist composition, which is prepared in the same manner as in Example 1, except that the pigment dispersion-1 is replaced by the pigment dispersion-8 prepared in this comparative example.

[0138] Comparative Example 4

[0139] This comparative example provides a pigment dispersion, named as pigment dispersion-9, which is different from Example 1 in that pigment dispersion-8 does not include MA-8.

[0140] This comparative example also provides a photoresist composition, which is prepared in the same manner as in Example 1, except that the pigment dispersion liquid-1 is replaced by the pigment dispersion liquid-9 prepared in this comparative example.

[0141] The data on the types of raw materials and their mass dosage of the pigment dispersions provided in Examples 1-5 and Comparative Examples 1-4 are shown in Table 1, and the pigment dispersions provided in Examples 1-5 and Comparative Examples 1-4 were also tested for edge straightness and slope angle, which are also recorded in Table 1.

[0142] Table 1 Pigment dispersion related data

[0143]

[0144] The data on the types of raw materials and their mass amounts of the photoresist compositions provided in Examples 1-5 and Comparative Examples 1-4 are shown in Table 2.

[0145] Table 2 Raw material data of photoresist composition

[0146]

[0147] The photoresist compositions provided in Examples 1-5 and Comparative Examples 1-4 were also tested for performance such as edge alignment and slope angle, as shown in Table 3.

[0148] Table 3 Photoresist composition performance test

[0149]

[0150] The edge alignment test method is as follows: the pigment dispersion or photoresist composition prepared in the embodiment and the comparative example is spin-coated on a blank glass of 7 cm x 7 cm, the film thickness is controlled to be about 1.2 μm by the rotation speed, and then baked at 100°C for 3 minutes, and the exposure amount is set to 40 mj for full exposure, and after development with an alkaline developer, the residual developer on the surface is washed away with water, and the glass substrate is cut and sampled and placed on a SEM to observe the pixel edge condition;

[0151] Evaluation criteria:

[0152] ◎: No jaggedness was observed at the edge of the pattern;

[0153] ○: jaggedness of the pattern edge is partially observed;

[0154] ×: Peeling or jaggedness of the pattern edge portion was observed.

[0155] The slope angle test method is as follows: the pigment dispersion or photoresist composition prepared in the embodiment and the comparative example is spin-coated on a blank glass of 7 cm x 7 cm, and the film thickness is controlled to be about 1.2 μm by the rotation speed, and then baked at 100° C. for 3 min, and the exposure amount is set to 40 mj for full exposure. After development with an alkaline developer, the residual developer on the surface is washed away with water, and the temperature is set to 230° C. in an oven and then baked for 30 min. After cutting and preparing samples, the glass substrate is placed on a SEM to observe the angle between the pixel edge and the substrate.

[0156] Evaluation criteria:

[0157] ◎: 30°-60°;

[0158] ○:>60°;

[0159] ×:<30°.

[0160] analyze:

[0161] From the above test results, it can be seen that the experimental results of edge straightness and slope angle of Comparative Examples 1-4, which use a mass ratio of MA-100 to MA-8 that is not within the range of 5-80:20-95, are poor. It is speculated that Comparative Examples 1 and 4 use too much MA-8 with a small oil absorption value, which causes excessive development and dissolution, thereby deteriorating the results of edge straightness and slope angle of the pattern. It is speculated that Comparative Examples 2 and 3 use too much MA-100 with a large oil absorption value, which reduces the dispersion stability and produces fine aggregation, thereby deteriorating the results of edge straightness and slope angle of the pattern.

[0162] In contrast, the photoresist compositions of Examples 1-5 have good results in edge straightness and slope angle, and when the mass ratio of MA-100 to MA-8 is 5-80:20-95, the synergistic effect of the two is better; among them, when the mass ratio of MA-100 to MA-8 in Example 1-3 is 10-70:30-90, the results of edge straightness and slope angle are the best. It is speculated that introducing MA-100 with a larger oil absorption value into MA-8 with a smaller oil absorption value can play a supporting role in the film layer, reduce the fluidity of the film layer, effectively improve the edge straightness, and optimize the developability, so as to obtain black matrix pixels with excellent pixel edge straightness and good cross-sectional slope angle.

[0163] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

[0164] In addition, those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present application and form different embodiments. For example, in the above claims, any one of the claimed embodiments may be used in any combination. The information disclosed in this background technology section is intended only to deepen the understanding of the overall background technology of the present application and should not be regarded as an admission or in any form of implication that the information constitutes prior art known to those skilled in the art.

Claims

1. A pigment dispersion, characterized in that: Includes black colorant; The black colorant includes carbon black A and carbon black B; The oil absorption value of the carbon black A is 80mL / 100g-100mL / 100g; The oil absorption value of the carbon black B is 50 mL / 100 g to 70 mL / 100 g.

2. The pigment dispersion according to claim 1, characterized in that: At least one of the following conditions is met: A. The mass ratio of the carbon black A to the carbon black B is 5-80:20-95; B. The particle sizes of the carbon black A and the carbon black B are independently 20nm-60nm; C. the pH of the carbon black A is 2-5; D. the pH of the carbon black B is 2-5; E. The raw materials of the pigment dispersion liquid, calculated by mass as 100%, include: Carbon black A 10%-70%, carbon black B 10%-70%, dispersant 5%-65%, first alkali-soluble resin 5%-65%, first organic solvent 10%-70%.

3. The pigment dispersion according to claim 2, characterized in that: At least one of the following conditions is met: A. The mass ratio of the carbon black A to the carbon black B is 10-70:30-90; B. the dispersant comprises a carbamate polymer dispersant and / or an acrylic polymer dispersant; C. the first alkali-soluble resin comprises an alkali-soluble Cardo resin and / or an acrylic copolymer resin; D. The first organic solvent includes one or more of ether organic solvents, ether ester organic solvents, ketone organic solvents, alcohol solvents, and nitrogen-containing organic solvents.

4. A photoresist composition, characterized in that The raw materials thereof, calculated by mass as 100%, include: 10%-70% of the pigment dispersion according to any one of claims 1 to 3, 5%-45% of a second alkali-soluble resin, 0.2%-5% of a photopolymerization initiator, 0.2%-50% of a photopolymerizable compound, and 10%-50% of a second organic solvent.

5. The photoresist composition according to claim 4, characterized in that The second alkali-soluble resin includes an alkali-soluble Cardo resin and / or an acrylic copolymer resin.

6. The photoresist composition according to claim 4, characterized in that The photopolymerization initiator includes 1-[9-ethyl-6-(2-methylbenzoyl)-9H-carbazole-3-yl]ethanone 1-(O-acetoxime), benzophenone, 4,4'-di(N,N-diethylamino)benzophenone, 4-methoxy-4'-dimethylaminobenzophenone, 2,2-diethoxyacetophenone, benzoin, benzoin methyl ether, benzoin isobutyl ether, benzyl dimethyl ketal, α-hydroxyisobutylbenzophenone, thioxanthone, 2- One or more of chlorothioxanthone, 1-hydroxycyclohexyl benzophenone, tert-butyl anthraquinone, 1-chloroanthraquinone, 2,3-dichloroanthraquinone, 3-chloro-2-methylanthraquinone, 2-ethylanthraquinone, 1,4-naphthoquinone, 1,2-benzoquininone, 1,4-dimethylanthraquinone, 2-phenylanthraquinone, 2-methyl-1[4-(methylthio)phenyl]-2-morpholinopropane-1-one, and 2-methyl-1-(4-methylthiophenyl)-2-morpholino-1-propanone.

7. The photoresist composition according to claim 4, characterized in that The photopolymerizable compound includes an acrylic compound and / or a methacrylate compound, wherein the acrylic compound and the methacrylate compound each independently contain three or more ethylenically unsaturated groups and satisfy at least one of the following conditions: A. The acrylic compound includes one or more of pentaerythritol triacrylate, pentaerythritol tetraacrylate, sorbitol triacrylate, sorbitol tetraacrylate, sorbitol pentaacrylate, sorbitol hexaacrylate, trimethylolpropane triacrylate, dipentaerythritol pentaacrylate, and dipentaerythritol hexaacrylate; B. The methacrylate compound includes one or more of trimethylolpropane trimethacrylate, trimethylolethane trimethacrylate, pentaerythritol trimethacrylate, pentaerythritol tetramethacrylate, dipentaerythritol hexamethacrylate, sorbitol trimethacrylate, and sorbitol tetramethacrylate.

8. The photoresist composition according to any one of claims 4 to 7, characterized in that: The second organic solvent includes one or more of an ether organic solvent, an ether ester organic solvent, a ketone organic solvent, an alcohol solvent, and a nitrogen-containing organic solvent.

9. A photosensitive glass, characterized in that: A photoresist composition comprising any one of claims 4 to 8.

10. A liquid crystal display device, characterized in that: Including the photosensitive glass as described in claim 9.

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