JP5948768B2 - Color filter for near ultraviolet light source - Google Patents

Description

  When used in a liquid crystal display device provided with a near-ultraviolet light-emitting element light source, the present invention can provide a good blue display and can display a color display with excellent visibility. The present invention relates to a color filter and a manufacturing method thereof.

  As a light source of a backlight used in a liquid crystal display device, conventionally used are a mercury gas-excited fluorescent lamp tube (FL), a cold cathode tube (CCFL) having emission peaks in red, green, and blue wavelength regions. It has been. However, in recent years, in liquid crystal display devices, where clearer color display is desired, FL and CCFL have sub-emissions in addition to the red, green, and blue wavelength regions, so that the color purity deteriorates. There is concern.

In view of this, use of a light-emitting diode that does not have sub-light emission (hereinafter sometimes referred to as an LED) instead of FL or CCFL as a light source of the backlight is being studied.
In addition, LEDs have advantages such as excellent responsiveness, long life, low voltage drive, and excellent environmental conservation because they are mercury-free compared to FL and CCFL.

As a backlight using such an LED light source, Patent Document 1 discloses a blue LED that emits light having a light emission peak (blue light) in a blue light region (435 nm to 460 nm), and red light that absorbs blue light. A backlight having a light source that combines a red phosphor that emits light having a light emission peak (red light or green light) in the region or the green light region and a translucent resin in which the green phosphor is dispersed is disclosed. . The backlight having the light source combines white light by combining three colors of light: blue light emitted from a blue LED, red light emitted from a red phosphor, and green light emitted from a green phosphor. It is presented.
However, in the backlight having the above-described configuration, there are cases where a red phosphor or a green phosphor capable of absorbing the blue light and emitting desired red light or green light is limited. When used in the above, there is a problem that it is difficult to achieve desired color reproducibility.

  Therefore, as a backlight using an LED light source, as shown in Patent Document 2 and Patent Document 3, a near-ultraviolet light-emitting element having a light emission peak in the near-ultraviolet light region (360 nm to 430 nm), a red phosphor, and a green fluorescence The structure which combined the body and the fluorescent substance layer containing a blue fluorescent substance is examined. In the backlight having the above-described configuration, it is possible to expand the degree of freedom of selection of each color phosphor that can be used in the phosphor layer, and the liquid crystal display device as compared with the backlight using the blue LED described above. The color reproducibility of the image can be improved.

  However, with respect to the blue phosphor used in the phosphor layer, there is a problem that no substance capable of absorbing near ultraviolet light and emitting desired blue light has been found at present. Therefore, in practice, a blue phosphor that emits light having an emission peak on the longer wavelength side than the blue light region is used. This also makes it difficult for the liquid crystal display device using the backlight having the above-described configuration to perform a desired blue display, and more specifically, the color density of the blue display is reduced. .

  It has been attempted to solve the above problem by adjusting the color density of blue display on the color filter side, for example, by adjusting the amount of the color material contained in the blue colored layer. It is being considered. However, for example, in order to perform blue display equivalent to a liquid crystal display device provided with a CCFL light source with a liquid crystal display device provided with a near-ultraviolet light emitting element light source, blue coloring is performed by a conventionally used color material such as a phthalocyanine-based blue pigment When adjusting the color density of the layer, the density of the color material becomes too high, making it difficult to form a blue colored layer with a conventional film thickness. In addition, there is a problem that it is difficult to reduce the thickness of the liquid crystal display device.

  Note that a blue color material for a color filter capable of performing good blue display when used with a near-ultraviolet light-emitting element light source has not yet been found.

JP 2010-209331 A International Publication WO2009 / 144922 Pamphlet International Publication WO 2010/103767 Pamphlet

  The present invention has been made to solve the above-described problems, and a near-ultraviolet light-emitting element capable of performing good blue display when used in a liquid crystal display device having a near-ultraviolet light-emitting element light source. The main object is to provide a color filter for a light source and a method for manufacturing the same.

  As a result of intensive studies to solve the above problems, the inventors of the present invention have used a triarylmethane-based color material as a color material for a blue colored layer of a color filter for a near-ultraviolet light-emitting element light source. Even when the colored layer is formed as a thin film, it is found that when used in a liquid crystal display device equipped with a near-ultraviolet light-emitting element light source, it is possible to perform blue display at a desired color density, and the present invention is completed. It came to.

  That is, the present invention has a transparent base material, and a blue colored layer formed on the transparent base material and containing a triarylmethane color material and a binder resin. Provide a color filter.

  According to the present invention, since the blue colored layer contains a triarylmethane colorant having high color purity, the blue colored layer exhibiting a desired color density as compared with the case of using a conventional phthalocyanine pigment. Can be formed into a thin film. Therefore, it is possible to perform good blue display using the color filter for near-ultraviolet light emitting element light source of the present invention.

  In the present invention, it is preferable that a fading preventing layer having gas barrier properties is formed on the blue colored layer. By having the color fading preventing layer, it is possible to suitably prevent the blue colored layer from fading due to the sublimation of the triarylmethane color material in the step of forming the blue colored layer.

  The present invention provides a blue colored layer composition coating step for forming a blue colored layer forming layer by coating a blue colored layer composition containing a triarylmethane colorant and a binder resin on a transparent substrate, An exposure / development process step for patterning the blue colored layer forming layer by exposing and developing the blue colored layer forming layer, and a post baking process for the patterned blue colored layer forming layer. A blue colored layer forming step having a post-baking treatment step for forming a blue colored layer by coating, and a color fading preventing layer composition containing a resin before the post-baking treatment step is applied on the blue colored layer forming layer. The anti-fading layer composition applying step for forming the anti-fading layer forming layer by the step of, and the tri-color in the blue colored layer forming layer in the post-baking treatment step. A fading prevention layer forming step having a curing step of curing the fading prevention layer forming layer to form a fading prevention layer having gas barrier properties before the reel methane colorant sublimates. Provided is a manufacturing method of a method for manufacturing a color filter for an ultraviolet light emitting element light source.

  According to the present invention, by including the color fading prevention layer forming step, it is possible to suitably prevent sublimation of the triarylmethane-based color material in the post-baking treatment step and to form a blue colored layer. Therefore, when used in a liquid crystal display device equipped with a near-ultraviolet light-emitting element light source, it is possible to manufacture a near-ultraviolet light-emitting element light source color filter capable of performing good blue display.

  In this invention, it is preferable that the said composition for anti-fading layers hardens | cures at temperature lower than the sublimation temperature of the said triarylmethane type | system | group coloring material. In the post-bake treatment step, it is possible to cure the anti-fading layer forming layer before the triarylmethane colorant sublimes from the blue colored layer forming layer, and thus more preferably prevent the above sublimation. Is possible. Moreover, since it becomes possible to perform a hardening process simultaneously with a post-baking process process, it becomes possible to simplify the manufacturing process of the manufacturing method of the color filter of this invention.

  In the present invention, in the blue color layer composition coating step and the color fading prevention layer composition coating step, the blue color layer composition and the color fading prevention layer composition are prepared using a multilayer simultaneous coating method. It is preferable that the blue colored layer forming layer and the fading preventing layer forming layer are simultaneously formed on the transparent substrate by coating in a lump. Thereby, the manufacturing process of the manufacturing method of the color filter of this invention can be made simple.

  The present invention is a near-ultraviolet light-emitting element light source capable of performing good blue display and capable of performing color display with excellent visibility when used in a display device including a near-ultraviolet light-emitting element light source. There is an effect that a color filter for use and a method for manufacturing the same are provided.

It is a schematic sectional drawing which shows an example of the color filter for near-ultraviolet light emitting element light sources of this invention. It is a schematic sectional drawing which shows the other example of the color filter for near-ultraviolet light emitting element light sources of this invention. It is a schematic sectional drawing which shows the other example of the color filter for near-ultraviolet light emitting element light sources of this invention. It is a schematic sectional drawing which shows the other example of the color filter for near-ultraviolet light emitting element light sources of this invention. It is a schematic sectional drawing which shows an example of the manufacturing method of the color filter for near-ultraviolet light emitting element light sources of this invention. It is a schematic sectional drawing which shows the other example of the manufacturing method of the color filter for near ultraviolet light emitting element light sources of this invention.

  The near-ultraviolet light-emitting element light source color filter of the present invention (hereinafter sometimes simply referred to as a color filter) and a color filter manufacturing method will be described below.

A. Color Filter First, the color filter of the present invention will be described.
The color filter of the present invention is characterized by having a transparent base material and a blue colored layer formed on the transparent base material and containing a triarylmethane color material and a binder resin.
The color filter of the present invention is used for a liquid crystal display device provided with a near-ultraviolet light emitting element light source. The near ultraviolet light source will be described later.

  Here, the color filter of the present invention will be described with reference to the drawings. FIG. 1 is a schematic sectional view showing an example of the color filter of the present invention. As shown in FIG. 1, a color filter 10 of the present invention has a transparent base material 1 and a blue colored layer 2B formed on the transparent base material 1 and containing a triarylmethane color material and a binder resin. It is. Moreover, the color filter 10 of this invention is the thing in which the red colored layer 2R and the green colored layer 2G are normally formed on the transparent base material 1 with the blue colored layer 2B. Moreover, you may have the light-shielding part 3 between coloring layers as needed.

According to the present invention, since the blue colored layer contains a triarylmethane colorant having high color purity, the blue colored layer exhibiting a desired color density as compared with the case of using a conventional phthalocyanine pigment. Can be formed into a thin film. Therefore, when the color filter of the present invention is used in a display device provided with a near-ultraviolet light-emitting element light source, it is possible to perform good blue display. Thereby, it can be set as the color filter which can perform the color display excellent in visibility.
Hereinafter, each configuration of the color filter of the present invention will be described.

1. Blue colored layer First, the blue colored layer in the present invention will be described.

(1) Material of blue colored layer The blue colored layer in the present invention contains a triarylmethane color material and a binder resin.

(I) Triarylmethane colorant The triarylmethane colorant used in the present invention contains a triarylmethane dye. Further, as the triarylmethane colorant, a triarylmethane dye may be used as it is, or a triarylmethane lake pigment may be used.
Hereinafter, the triarylmethane dye and the triarylmethane lake pigment will be described.

(A) Triarylmethane dye The triarylmethane dye used in the present invention contains a dye having a structure represented by the following general formula (I). In this invention, it can be used individually by 1 type represented by the following general formula (I), or in combination of 2 or more types.

（一般式（Ｉ）中、Ｒ^１１〜Ｒ^１６は、各々独立に水素原子、置換基を有していてもよいアルキル基又は置換基を有していてもよいアリール基を表わすか、あるいはＲ^１１とＲ^１２、Ｒ^１３とＲ^１４、Ｒ^１５とＲ^１６が結合して環構造を形成している。Ｘ⁻はアニオンである。）

(In General Formula (I), R ^{11 to} R ¹⁶ each independently represents a hydrogen atom, an alkyl group which may have a substituent, or an aryl group which may have a substituent, or R 11 ¹¹ and R ¹² , R ¹³ and R ¹⁴ , R ¹⁵ and R ¹⁶ are combined to form a ring structure, and X ⁻ is an anion.)

The alkyl group in R ¹¹ to R ^16, is not particularly limited, such as linear or branched alkyl group having 1 to 20 carbon atoms can be mentioned, preferably has a carbon number of 1 to 8, carbon atoms It is more preferable that it is 1-5 from the point of the ease of manufacture and raw material procurement. Especially, it is especially preferable that the alkyl group in R < ¹¹ > -R < ¹⁶ > is an ethyl group or a methyl group. The substituent that the alkyl group may have is not particularly limited, and examples thereof include an aryl group, a halogen atom, and a hydroxyl group.
The aryl group in R ^{11 to} R ¹⁶ is not particularly limited, and examples thereof include a phenyl group, a naphthyl group, and a phenylmethyl group. Examples of the substituent that the aryl group may have include an alkyl group and a halogen atom.

R ¹¹ and R ¹² , R ¹³ and R ¹⁴ , and R ¹⁵ and R ¹⁶ are combined to form a ring structure. R ¹¹ and R ¹² , R ¹³ and R ¹⁴ , and R ¹⁵ and R ¹⁶ are nitrogen. A ring structure is formed through an atom. The ring structure is not particularly limited, and examples thereof include a pyrrolidine ring, a piperidine ring, and a morpholine ring.

Among them, from the viewpoint of chemical stability, R ^{11 to} R ¹⁶ are each independently a hydrogen atom, an alkyl group having 1 to 5 carbon atoms, a phenyl group, or R ¹¹ and R ¹² , R ¹³ and R ¹⁴ , R ^15. And R ¹⁶ are preferably bonded to form a pyrrolidine ring, piperidine ring, or morpholine ring.

Although R ¹¹ to R ¹⁶ may be taken independently of the above structure, R ¹¹ among them is preferably from the viewpoint of color purity R ¹⁵ is a hydrogen atom, further in terms of manufacturing and ease of procurement of raw materials to R More preferably, ¹⁴ and R ¹⁶ are all the same.

X ⁻ is an anion, which is a counter anion of the triarylmethane cation. The anion used as X ⁻ is not particularly limited, and examples thereof include halide ions such as chlorine ion, bromine ion and iodine ion, perchlorate ion, tetrafluoroborate ion and organic sulfonate ion. .

X ^- is an organic sulfonic acid ions used as, for example, or alkylsulfonic acid ions such as mesylate ion, aryl sulfonate ion such as tosylate. Further, it may be a divalent or higher anion in which two or more sulfonate groups are bonded to an aromatic compound, and examples thereof include naphthalene disulfonate ions and naphthalene trisulfonate ions.

(B) Triarylmethane-based lake pigment Next, the triarylmethane-based lake pigment used in the present invention will be described. A triarylmethane type | system | group lake pigment is a lake-ized triarylmethane type | system | group dye.
“Lake” refers to a technique in which by adding a precipitating agent such as a metal salt, a solvent-soluble dye is adsorbed and precipitated on the precipitating agent to produce insoluble fine particles (pigments) composed of the precipitate. .

  Since the triarylmethane dye used in the triarylmethane lake pigment can be the same as that described above, description thereof is omitted here.

The precipitant used in the triarylmethane-based lake pigment is not particularly limited as long as it can be used as a pigment that can be used in a blue colored layer. For example, barium chloride, calcium chloride, ammonium sulfate, Aluminum chloride, aluminum acetate, lead acetate, tannic acid, katanol, tamol, phosphotungstic acid, phosphomolybdic acid, phosphotungsten molybdic acid, silicotungsten molybdic acid, silicotungstic acid, silicomolybdic acid, phosphotungstic acid , Heteropolyacids such as phosphomolybdic acid and phosphotungsten molybdic acid are preferably used.
Among them, it is preferable to use a heteropoly acid from the viewpoint of excellent durability, and among the heteropoly acids, it is more preferable to use phosphotungstic acid, phosphomolybdic acid, and phosphotungsten molybdic acid from the viewpoint of easy availability.

  The triarylmethane lake pigment used in the present invention can be obtained by lake using a known method using a triarylmethane dye having a desired structure and the precipitant. Examples of triarylmethane lake pigments include C.I. I. Pigment blue 1, C.I. I. Pigment blue 2, C.I. I. Pigment blue 9, C.I. I. Pigment blue 10, C.I. I. Pigment blue 14, C.I. I. Pigment blue 62, C.I. I. Pigment violet 3, C.I. I. Pigment violet 27, C.I. I. Pigment Violet 39 or the like can be used. In addition, C.I. I. Pigment blue 26, C.I. I. Basic Blue 7, C.I. I. Basic Violet 1, C.I. I. Basic violet 3 or the like can be raked using the above precipitant.

(C) Triarylmethane-based coloring material In the present invention, only the above-mentioned triarylmethane-based dye may be used, or only a triarylmethane-based lake pigment may be used. You may mix and use a system lake pigment.
The content of the triarylmethane color material is not particularly limited as long as the blue color layer can be used to perform a desired blue display, but the color of the triarylmethane color material and other color materials is not limited. The ratio in the material is preferably 50:50 to 100: 0, particularly 70:30 to 100: 0, and particularly preferably 80:20 to 100: 0. If the content is less than the above range, even if a triarylmethane colorant with high color purity is used, the desired color density may not be exhibited. When exceeding, it may be difficult to form the blue colored layer itself.

(Ii) Binder resin Next, the binder resin in the present invention will be described.
The binder resin used in the present invention is not particularly limited as long as it can form a blue colored layer by dispersing or dissolving the above-described triarylmethane-based color material, and is a conventionally known color filter. An alkali-soluble resin, a thermosetting resin, or a thermoplastic resin used in the colored pixels can be used.

Examples of the alkali-soluble resin include, for example, ethylene-polymerized monomers such as acrylic acid, methacrylic acid, dimer of acrylic acid, itaconic acid, crotonic acid, maleic acid, fumaric acid, vinyl acetic acid and acid anhydrides thereof. Vinyl acetate copolymer, ethylene-vinyl chloride copolymer, ethylene vinyl copolymer, polystyrene, acrylonitrile-styrene copolymer, ABS resin, polymethacrylic acid resin, ethylene methacrylic acid resin, polyvinyl chloride resin, chlorinated chloride Vinyl, polyvinyl alcohol, cellulose acetate propionate, cellulose acetate butyrate, nylon 6, nylon 66, nylon 12, polyethylene terephthalate, polybutylene terephthalate, polycarbonate, polyvinyl acetal, polyether ether ketone Polyether sulfone, polyphenylene sulfide, polyarylate, polyvinyl butyral, epoxy resins, phenoxy resins, polyimide resins, polyamide-imide resins, polyamic acid resins, polyether imide resins, phenolic resins, urea resins, and the like.
In addition, polymerizable monomers methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) acrylate, sec-butyl (meth) acrylate, isobutyl (meth) acrylate, tert -Butyl (meth) acrylate, n-pentyl (meth) acrylate, n-hexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, n-octyl (meth) acrylate, n-decyl (meth) acrylate, 2-hydroxy Examples include ethyl methacrylate, benzyl methacrylate, styrene, α-methylstyrene, N-vinyl-2-pyrrolidone, glycidyl (meth) acrylate, and the like.
In the present invention, commercially available binder resins can also be used. For example, Aronix M-5600 (trade names Aronix M-5600, Aronix M-6200, Aronix M-7100 and Aronix M-9050 manufactured by Toagosei Co., Ltd. Is preferred.
The molecular weight of the alkali-soluble resin is preferably 5,000 to 50,000.

Examples of the thermosetting resin include a polymer composed of a structural unit represented by the formula (1) and a structural unit represented by the formula (2) described in JP2010-2746A (binder resinous epoxy resin). ) Is preferred.
The molecular weight of the thermosetting resin is preferably 5,000 to 100,000.

  In the present invention, the alkali-soluble resin or the thermosetting resin may be used alone or in combination of two or more.

(Iii) Other materials The material of the blue colored layer used in the present invention can be appropriately selected and added in addition to the above-described triarylmethane-based color material and binder resin. Examples of such materials include color materials other than triarylmethane color materials, pigment dispersants, antioxidants, and the like. The color material other than the triarylmethane-based color material and the pigment dispersant can be the same as those used in a general color filter, and thus description thereof is omitted here.

  In the present invention, it is preferable to add at least an antioxidant among the above-mentioned optional materials. This is because it is possible to suppress fading due to oxidative degradation of the triarylmethane color material by using the antioxidant.

  As antioxidants, specific examples of phenolic antioxidants include 2,6-di-t-butylphenol (molecular weight 206), 2,6-di-t-butyl-p-cresol (molecular weight 220) (product) Name: Yoshinox BHT (manufactured by API Corporation)), 4,4′-butylidenebis (6-t-butyl-3-methylphenol) (molecular weight 383) (trade name: Yoshinox BB (manufactured by API Corporation)), 2,2'-methylenebis (4-methyl-6-t-butylphenol) (molecular weight 341) (trade name: Yoshinox 2246G (manufactured by API Corporation)), 2,2'-methylenebis (4-ethyl-6-t -Butylphenol) (Molecular weight 369) (Brand name: Yoshinox 425 (AP Corporation) 2,6-di-t-butyl-4-ethylphenol (molecular weight 234) (trade name: Yoshinox 250 (manufactured by API Corporation)), 1,1,3-tris (2-methyl) -4-hydroxy-5-t-butylphenyl) butane (molecular weight 545) (trade name: Yoshinox 930 (manufactured by API Corporation)), n-octadecyl-3- (3,5-di-t-butyl-4 -Hydroxyphenyl) propionate (molecular weight 531) (trade name: Tominox SS (manufactured by API Corporation), trade name: IRGANOX 1076 (manufactured by Ciba Japan)), tetrakis [methylene-3- (3,5- Di-t-butyl-4-hydroxyphenyl) propionate] methane (molecular weight 1178) (trade name: Tomi TT (manufactured by API Corporation), trade name: IRGANOX 1010 (manufactured by Ciba Japan Co., Ltd.)), triethylene glycol bis [3- (3-tert-butyl-4-hydroxy-5-methylphenyl) propionate] (Molecular weight 587) (trade name: Tominox 917 (manufactured by API Corporation), trade name: IRGANOX 245 (manufactured by Ciba Japan)), Tris (3,5-di-t-butyl-4-hydroxybenzyl) ) Isocyanurate (molecular weight 784) (trade name: Yoshinox 314 (manufactured by API Corporation), trade name: IRGANOX 3114 (manufactured by Ciba Japan)), 6- [3- (3-t-butyl-4 -Hydroxy-5-methyl) propoxy] -2,4,8,10 Tetra-t-butyldibenz [d, f] [1,3,2] -dioxaphosphepine (molecular weight 741) (trade name: Sumilizer GA-80 (manufactured by Sumitomo Chemical)), 2,2-thio-diethylenebis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate] (molecular weight 643) (trade name: IRGANOX 1035 (manufactured by Ciba Japan)), N, N′-hexamethylenebis ( 3,5-di-t-butyl-4-hydroxy-hydrocinnamamide (molecular weight 637) (trade name: IRGANOX 1098 (manufactured by Ciba Japan Co., Ltd.)), isooctyl-3- (3,5-di-) t-butyl-4-hydroxyphenyl) propionate (molecular weight 391) (trade name: IRGANOX 1135 (manufactured by Ciba Japan)), 1,3 , 5-trimethyl-2,4,6-tris (3,5-di-t-butyl-4-hydroxybenzyl) benzene (molecular weight 775) (trade name: IRGANOX 1330 (manufactured by Ciba Japan)), 2 , 4-bis (dodecylthiomethyl) -6-methylphenol (molecular weight 537) (trade name: IRGANOX 1726 (manufactured by Ciba Japan Co., Ltd.)), bis (3,5-di-t-butyl-4-hydroxybenzyl) Ethyl phosphonate) Mixture of calcium and polyethylene wax (molecular weight 695) (trade name: IRGANOX 1425 (manufactured by Ciba Japan)), 2,4-bis [(octylthio) methyl] -o-cresol (molecular weight 425) (Product name: IRGANOX 1520 (manufactured by Ciba Japan Co., Ltd.)), 1,6-hexanediol [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate] (molecular weight 639) (trade name: IRGANOX 259 (manufactured by Ciba Japan)), 2,4-bis- (n -Octylthio) -6- (4-hydroxy-3,5-di-t-butylanilino) -1,3,5-triazine (molecular weight 589) (trade name: IRGANOX 565 (manufactured by Ciba Japan)), diethyl ((3,5-bis (1,1-dimethylethyl) -4-hydroxyphenyl) methyl) phosphonate (molecular weight 356) (trade name: IRGAMOD 295 (manufactured by Ciba Japan Co., Ltd.)). In particular, as described above, it is preferable to use a phenolic antioxidant having a molecular weight of 2,500 or less.

  Specific examples of phosphorus antioxidants include 6- [3- (3-t-butyl-4-hydroxy-5-methylphenyl) propoxy] -2,4,8,10-tetra-t-butyldibenz [d , F] [1,3,2] dioxaphosphine (molecular weight 661) (trade name: Sumilizer GP (manufactured by Sumitomo Chemical)), tris (2,4-di-t-butylphenyl) phosphite (molecular weight 647) (Product name: IRGAFOS 168 (manufactured by Ciba Japan Co., Ltd.)), 2-[[2,4,8,10 tetrakis (1,1-dimethylethyl) dibenzo [d, f] [1,3,2] Dioxaphosphepin-6-yl] oxy] -N, N-bis [2-[[2,4,8,10 tetrakis (1,1-dimethylethyl) dibenzo [d, f] [1,3 2] Dioxaphosphepine- 6-yl] oxy] -ethyl] ethanamine (molecular weight 1465) (trade name: IRGAFOS 12 (manufactured by Ciba Japan KK)), bis (2,4-di-t-butyl-6-methylphenyl) ethyl phosphite (Molecular weight 514) (trade name: IRGAFOS 38 (manufactured by Ciba Japan Co., Ltd.)) and the like.

  Specific examples of sulfur-based antioxidants include dilauryl thiodipropionate (molecular weight 515) (trade name: DLTP “Yoshitomi” (manufactured by API Corporation), trade name: IRGANOX PS 800 FD (Ciba Japan Co., Ltd.) ), Distearyl thiodipropionate (molecular weight 683) (trade name: DSTP “Yoshitomi” (manufactured by API Corporation), trade name: IRGANOX PS 802 FD (manufactured by Ciba Japan)), dimyristylthio Dipropionate (molecular weight: 571) (trade name: DMTP “Yoshitomi” (manufactured by API Corporation), trade name: Sumilizer TPM (manufactured by Sumitomo Chemical)), ditridecylthiodipropionate (molecular weight: 543) (trade name: DTTP) (AP Corporation) ® emission Co.), pentaerythrityl tetrakis (3-laurylthiopropionate) (molecular weight 1162) (trade name: Sumilizer TP-D (available from Sumitomo Chemical)), and the like.

  The antioxidant is preferably contained in the blue colored layer in an amount of 0.01 to 10% by mass, more preferably 0.05 to 5%, and particularly preferably 0.1 to 3%.

(2) Blue colored layer The blue colored layer used for this invention is demonstrated.
The blue colored layer used in the present invention is not particularly limited as long as it can exhibit a desired blue color when used in a display device including a near-ultraviolet light-emitting element light source. More specifically, the chromaticity coordinates of the blue colored layer in the CIE chromaticity diagram are 0.140 ≦ x ≦ 0.160 and 0.050 ≦ y ≦ 0.075, in particular 0.145 ≦ x ≦ 0. 160 and 0.050 ≦ y ≦ 0.070, in particular 0.148 ≦ x ≦ 0.155 and 0.055 ≦ y ≦ 0.065. When the chromaticity coordinates of the blue colored layer are within the above range, a desired blue display can be performed when the color filter of the present invention is used in a liquid crystal display device including a near-ultraviolet light emitting element light source. .
In addition, about the chromaticity coordinate of a blue colored layer, it can obtain | require, for example with the following measuring methods.
First, a blue colored layer substrate for evaluation in which a blue colored layer is formed with a desired thickness on a transparent substrate is prepared. Next, using a near-ultraviolet light-emitting element light source as a backlight, chromaticity coordinates can be measured with a luminance meter SR-UL1 (manufactured by TOPCON).

  The thickness of the blue colored layer is not particularly limited as long as the color filter of the present invention can be used for a liquid crystal display device including a near-ultraviolet light emitting element light source so that a desired blue display can be performed. However, it is preferably in the range of 1.0 μm to 10 μm, in particular in the range of 1.5 μm to 7.0 μm, particularly in the range of 2.0 μm to 5.0 μm. When the thickness of the blue colored layer is less than the above range, it is difficult to achieve a desired color density using the color filter of the present invention even when the triarylmethane colorant is used. This is because, when the thickness of the blue colored layer exceeds the above range, it may be difficult to form the color filter of the present invention in a thin film.

  The blue colored layer is usually formed on a transparent substrate in a predetermined arrangement pattern together with a red colored layer and a green colored layer described later. Such an arrangement pattern can be the same as the arrangement pattern of a colored layer in a general color filter, and specifically, a known arrangement such as a stripe type, a mosaic type, a triangle type, or a four-pixel arrangement type. The coloring area can be arbitrarily set.

  The method for forming the blue colored layer can be the same as the method for forming the colored layer in a general color filter, and thus the description thereof is omitted here.

2. Transparent base material Next, the transparent base material in this invention is demonstrated.
The transparent substrate in the present invention is not particularly limited as long as it has translucency with respect to light from a near-ultraviolet light-emitting element light source and can form the blue colored layer and the like. The substrate may be a transparent substrate having no flexibility, or may be a transparent substrate having flexibility such as a resin film. In addition, about a specific transparent base material, since it can be made to be the same as that used for a general color filter, description here is abbreviate | omitted.

3. Other Configurations The color filter of the present invention is not particularly limited as long as it has the above-described blue colored layer and a transparent substrate, and a necessary configuration can be appropriately selected and added. Hereinafter, such a configuration will be described.

(1) Fading prevention layer The color filter of the present invention preferably has a fading prevention layer having gas barrier properties on the blue colored layer.
Here, when the triarylmethane color material contained in the blue colored layer is present in the uncured binder resin, the color material has the property of being sublimated and oxidized and deteriorated by heating to a predetermined temperature. It is. Therefore, in the present invention, in order to keep the color density of the blue colored layer higher, it is more preferable that the blue colored layer is formed at a temperature lower than the sublimation temperature of the triarylmethane color material. However, in the current method for producing a color filter, when a colored layer is formed, a step of baking and curing a colored layer forming layer comprising a colored layer composition at a temperature higher than the sublimation temperature is often performed. For this reason, there is a concern that the triarylmethane-based color material sublimes during firing, and the finally obtained blue colored layer does not exhibit a desired color density.
Therefore, at the time of manufacturing the color filter of the present invention, the gas barrier property is such that the sublimation can be prevented before the triarylmethane colorant is sublimated from the blue colored layer forming layer during firing. It is preferable to prevent fading of the blue colored layer by forming a fading preventing layer.

The formation position of such a fading prevention layer is not particularly limited as long as it can prevent the triarylmethane-based color material from sublimating during the formation process of the blue coloring layer. The color filter is not particularly limited as long as it is formed on a blue colored layer used as a blue pixel when used in a display device. Moreover, when a color filter has a light-shielding part, if it can cover the opening part of the light-shielding part in which the blue colored layer is formed at least, it will not specifically limit.
More specifically, as shown in FIGS. 2 (a) and 2 (b), the anti-fading layer 4 may be formed on the blue colored layer 2B. As shown in FIG. The fading prevention layer 4 may be formed so as to cover it. When the fading prevention layer 4 is formed on the blue coloring layer 2B, the fading prevention layer 4 may be formed on the entire surface of the blue coloring layer 2B as shown in FIG. As shown in FIG. 2B, the fading prevention layer 4 is formed only on the blue colored layer 2B used for the blue pixel (the blue colored layer 2B formed in the opening of the light shielding portion 3 in FIG. 2B). It may be formed.
2A, 2B, and 3 are schematic cross-sectional views illustrating other examples of the color filter of the present invention, and reference numerals that are not described may be the same as those in FIG. The description here is omitted.

  In the present invention, as shown in FIG. 4, the fading prevention layer 4 may be formed so as to cover the colored layer side surface of the color filter 10. In addition, when the fading prevention layer 4 is formed as shown in FIG. 4, it becomes possible to use the fading prevention layer 4 also as a planarization layer mentioned later. FIG. 4 is a schematic cross-sectional view showing another example of the color filter of the present invention, and reference numerals that are not described may be the same as those in FIG.

  The anti-fading layer is not particularly limited as long as it does not impair the spectral characteristics of the blue colored layer, and may have transparency, may be blue, but has transparency. More preferably. This is because the discoloration preventing layer has transparency so that the spectral characteristics of the blue colored layer can be more effectively exhibited.

  The material for the fading prevention layer is not particularly limited as long as it can form a gas barrier layer on the blue colored layer, and may be an inorganic material or an organic material. However, considering the simplicity of the manufacturing process and the like, an organic material is preferable.

  The organic material used for such a fading prevention layer can be the same as the alkali-soluble resin and thermosetting resin used for the binder resin of the blue colored layer described above.

  As an organic material used for the fading prevention layer, an epoxy compound, a silane coupling agent, and a silicone alkoxy oligomer are particularly preferable. Epoxy compounds are widely disclosed in, for example, published by Masaki Shinbo, “Epoxy Resin Handbook” published by Nikkan Kogyo Shimbun, Ltd. (1987), and the like can be used. As the silane coupling agent, KMB-903, KBE-903, KBM573, KBM-403, KBE-402, KBE-403, KBM-303, KBM-802, KBM-803, KBE-9007, X-12-967C (Manufactured by Shin-Etsu Silicone). As the silicone alkyl oligomer, those having an epoxy, mercapto, acrylic or amino group are preferred. Examples include X-41-1053, X-41-1805, KR-513 (manufactured by Shin-Etsu Silicone).

  The thickness of the anti-fading layer is not particularly limited as long as it is a thickness that can prevent the triarylmethane-based color material from sublimating from the blue colored layer, but is in a range of 0.05 μm to 1.0 μm. Of these, it is particularly preferable that the thickness be in the range of 0.1 μm to 0.8 μm, particularly in the range of 0.3 μm to 0.5 μm. When the thickness of the anti-fading layer is less than the above range, even when the anti-fading layer is formed, it may be difficult to prevent the sublimation, or the blue coloring layer and the anti-fading layer may be mixed. Because. Moreover, it is because it will become difficult to form the color filter of this invention in a thin film when the thickness of a fading prevention layer exceeds the said range.

(2) Colored layer In the color filter of the present invention, a colored layer of another color is usually formed together with the blue colored layer described above. Such a colored layer usually has a red colored layer and a green colored layer. Moreover, in this invention, you may have further colored layers of colors other than red, green, and blue.

  The red colored layer and the green colored layer are constituted by dispersing or dissolving each color material in the binder resin described in the section of “1. Blue colored layer” described above.

The color material used for the red colored layer is not particularly limited as long as it can perform a desired red display when the color filter of the present invention is used in a display device including a near-ultraviolet light emitting element light source. A known red color material can be used instead.
In addition, as a color material used for the green colored layer, in particular, if the color filter of the present invention can be used for a display device equipped with a near-ultraviolet light emitting element light source, a desired green display can be performed. It is not limited, A well-known green color material can be used.

  About the thickness and arrangement pattern of a red coloring layer and a green coloring layer, since it can be made to be the same as that of the thickness and arrangement pattern of a blue coloring layer mentioned above, description here is abbreviate | omitted.

(3) Light-shielding part The color filter of this invention can form the light-shielding part for partitioning a pixel between colored layers as needed.

  The pattern shape of such a light shielding portion can be appropriately selected depending on the pattern shape of the colored layer or the fluorescent layer described above.

  The material of the light shielding part is not particularly limited as long as it can exhibit a desired light shielding property, and may be the same as that used for a light shielding part of a general color filter. Specifically, a light-shielding part made of a light-shielding metal or metal oxide such as chromium or nickel, a light-shielding part made of a resin composition containing a light-shielding agent such as a black pigment, and a light-shielding structure in which the above-described colored layers are laminated. And the like. Especially, in this aspect, it is preferable that it is a light shielding part which laminated | stacked colored layers. This is because it can be formed simultaneously with the formation of the colored layer, and it is not necessary to prepare a material for the light shielding portion separately, so that the manufacturing cost can be reduced.

(4) Planarization layer The color filter of this invention can have the planarization layer formed so that the colored layer side of the transparent base material might be covered as needed. The flattening layer is used to flatten the surface of the color filter and protect the colored layer of each color.
The material, thickness, and the like used for the planarization layer can be the same as those used for a general color filter, and thus description thereof is omitted here.

  In the present invention, as described above, the anti-fading layer may also serve as a flattening layer.

(5) Other Configurations The color filter of the present invention can be added by appropriately selecting an arbitrary configuration other than the configuration described above. Examples of such a configuration include columnar spacers used for maintaining the cell gap between the color filter and the counter substrate and making the thickness of the liquid crystal layer uniform.

4). Use The color filter of the present invention is used in a liquid crystal display device provided with a near-ultraviolet light-emitting element light source.

  Moreover, it is preferable that the color filter of this invention is used for the liquid crystal display device provided with the near-ultraviolet light emitting element light source in which the blue light emission peak exists in the range of 450 nm-500 nm among the liquid crystal display devices mentioned above. In the present invention, excellent blue display can be performed even when used with a near-ultraviolet light-emitting element light source having a blue emission peak in the wavelength region described above.

5. Method for Producing Color Filter The method for producing the color filter of the present invention is not particularly limited, and examples thereof include the method described in the section “B. Method for producing color filter” described later.

6). Others The color filter of the present invention is used together with a near-ultraviolet light-emitting element light source. Hereinafter, the near-ultraviolet light-emitting element light source will be described.

  The near-ultraviolet light-emitting element light source usually has a near-ultraviolet light-emitting element having an emission peak in the above-described wavelength region, and a phosphor layer containing a red phosphor, a green phosphor, and a blue phosphor.

  The near-ultraviolet light-emitting element light source is not particularly limited as long as it has a light emission peak in the wavelength region described above, and examples thereof include a near-ultraviolet light-emitting diode (LED) and a near-ultraviolet laser. In the present invention, a near-ultraviolet LED is particularly preferable. About near ultraviolet light LED, a well-known thing can be used.

  As the phosphor layer, one in which the phosphors of the respective colors described above are dispersed in a transparent resin layer is usually used. Known resin materials, red phosphors, green phosphors, and blue phosphors used for the transparent resin layer can be used.

  The form of the near-ultraviolet light-emitting element light source may be a direct type disposed on the entire surface of the display device, and has an edge light type having a light guide plate and disposed on the side of the light guide plate. Also good. In addition, about a light-guide plate, it can be a well-known thing.

  The near-ultraviolet light-emitting element light source used with the color filter of the present invention is not limited to the configuration described above.

B. Next, a method for producing a color filter of the present invention will be described.
The method for producing a color filter of the present invention includes a blue colored layer for forming a blue colored layer forming layer by applying a blue colored layer composition containing a triarylmethane-based color material and a binder resin on a transparent substrate. A composition coating step, an exposure / development step of patterning the blue colored layer forming layer by exposing and developing the blue colored layer forming layer, and a patterning of the blue colored layer forming layer. A blue colored layer forming step having a post bake treatment step for forming a blue colored layer by performing a post bake treatment, and a composition for a fading prevention layer containing a resin before the post bake treatment step is used for forming the blue colored layer. The anti-fading layer composition coating step for forming the anti-fading layer forming layer by coating on the layer, and the blue color in the post-baking treatment step A fading prevention layer forming step having a curing step of curing the fading prevention layer forming layer to form a fading prevention layer having gas barrier properties before the triarylmethane colorant in the color layer forming layer is sublimated; and The manufacturing method characterized by having.

  Here, the manufacturing method of the color filter of this invention is demonstrated using figures. 5A to 5E are process diagrams showing an example of a method for producing a color filter of the present invention. First, the blue colored layer forming step in the present invention will be described. In the blue colored layer forming step, first, as shown in FIGS. 5A and 5B, the blue colored layer composition 12 </ b> B is applied onto the transparent substrate 1 using the multilayer simultaneous coating apparatus 20. A blue colored layer forming layer 2B ′ is formed (blue colored layer composition coating step). Next, as shown in FIGS. 5C and 5D, the blue colored layer forming layer 2B ′ is exposed by irradiating the exposure light 40 through the photomask 30, and then developed. To pattern the blue colored layer forming layer 2B ′ (exposure / development process). Next, the blue colored layer 2B shown in FIG. 5E is formed by subjecting the patterned blue colored layer forming layer 2B 'to post baking (post baking process).

Next, the fading prevention layer forming step in the present invention will be described. In the fading prevention layer forming step, as shown in FIGS. 5 (a) and 5 (b), first, using the multilayer simultaneous coating apparatus 20, simultaneously with the blue coloring layer composition coating step, the fading prevention layer composition. 14 is applied onto the blue colored layer forming layer 2B ′ to form a fading preventing layer forming layer 4 ′. Next, as shown in FIGS. 5C and 5D, the anti-fading layer forming layer 4 ′ is also subjected to the exposure / development processing step and the post-bake processing step simultaneously with the blue colored layer forming layer 2B ′. Is called.
Here, when the composition 14 for fading prevention layer exhibits photocurability, as shown in FIGS. 5C and 5D, a layer for forming a fading prevention layer during exposure in the exposure / development processing step. 4 'hardens and becomes the fading prevention layer 4. On the other hand, when the anti-fading layer composition 14 exhibits thermosetting properties, as shown in FIGS. 5D and 5E, the anti-fading layer forming layer 4 ′ is cured in the post-baking process. Thus, the fading prevention layer 4 is obtained.
The color filter manufacturing method of the present invention can manufacture the color filter 10 as shown in FIG. 5E by performing the above-described steps.

  In addition, as shown to Fig.5 (a)-(e), you may form the light-shielding part 3 previously on the transparent base material 1 as needed in this invention. 5A to 5E, the example using the transparent base material 1 on which the red colored layer 2R and the green colored layer 2G are formed in advance has been described. Although not specifically limited, although not illustrated, a red colored layer or a green colored layer may be formed after the blue colored layer is formed.

6A to 6E are process diagrams showing another example of the color filter manufacturing method of the present invention. In the present invention, a blue colored layer forming layer 2B ′ is formed as shown in FIG. 6 (a), and the blue colored layer forming layer 2B ′ is formed as shown in FIGS. 6 (b) and 6 (c). After patterning the layer 2B ′ for forming the blue colored layer by performing exposure and development processing, as shown in FIG. 6D, the composition for preventing fading is applied on the layer 2B ′ for forming the blue colored layer. Thus, it is possible to form the color fading prevention layer forming layer 4 ′. In addition, although not shown, when the composition for fading prevention layer shows photocurability, after light irradiation is performed to cure the fading prevention layer forming layer to form a fading prevention layer, a blue colored layer is formed. By subjecting the working layer to a post-bake treatment, a blue colored layer 2B is formed as shown in FIG. 6 (e). On the other hand, when the composition for color fading prevention layer shows thermosetting property, post-baking treatment is performed on the layer for color fading prevention layer formation together with the layer for color blue color formation layer, so that FIG. 2B and the anti-fading layer 4 are formed.
The color filter manufacturing method of the present invention can manufacture the color filter 10 shown in FIG. 6E by performing the above-described steps.
6 (a) to 6 (e), an example in which the fading prevention layer 4 is formed so as to cover the colored layer side of the transparent substrate 1 has been described, but FIGS. 2 (a), 2 (b) and FIG. As shown in FIG. 3, the fading prevention layer 4 can be formed in a pattern on the blue colored layer 2B.
Moreover, since the reference numerals not described in FIGS. 6A to 6E can be the same as the reference numerals described in FIGS. 5A to 5E, description thereof is omitted here.

  According to the present invention, by having the color fading prevention layer forming step, it is possible to form a blue colored layer by preventing sublimation of the triarylmethane colorant in the post-bake processing step, and thus forming a blue coloring layer. It is possible to manufacture a color filter with excellent quality.

  Hereinafter, each process of the manufacturing method of the color filter of this invention is demonstrated.

1. Blue colored layer forming step In the blue colored layer forming step of the present invention, the blue colored layer forming step is carried out by applying a blue colored layer composition containing a triarylmethane colorant and a binder resin on a transparent substrate. The blue colored layer composition coating step to be formed, the exposure / development treatment step of patterning the blue colored layer forming layer by exposing and developing the blue colored layer forming layer, and the patterned blue coloring This is a step having a post-bake treatment step of forming a blue colored layer by subjecting the layer forming layer to a post-bake treatment.
Hereinafter, each step will be described.

(1) Blue colored layer composition coating step In the blue colored layer composition coating step of the present invention, a blue colored layer composition containing a triarylmethane-based color material and a binder resin is coated on a transparent substrate. This is a step of forming a blue colored layer forming layer.

(I) Method for forming blue colored layer forming layer As a method for forming the blue colored layer forming layer used in this step, it is possible to apply the blue colored layer composition with a desired thickness on a transparent substrate. There is no particular limitation as long as it is a simple method, and a general coating method can be used. Specific examples include spin coating, casting, dipping, bar coating, blade coating, roll coating, gravure coating, flexographic printing, and spray coating.

  Further, in this step, the blue colored layer forming layer and the later-described fading prevention layer composition are collectively applied using a multilayer simultaneous coating method to form the blue colored layer forming layer and the later-described layer on the transparent substrate. It is also possible to simultaneously form the color fading prevention layer forming layer.

  Here, the multilayer simultaneous coating method is a coating method in which a plurality of coating liquids are simultaneously coated to form a multilayer. The multilayer simultaneous coating method can be performed specifically by using a multilayer simultaneous coating apparatus such as a die coater having a plurality of slits.

  In addition, since the blue colored layer forming layer and the fading preventing layer forming layer formed in the multilayer simultaneous coating method are laminated in an undried state, the components of each layer are prevented from being mixed into other layers. Therefore, it is preferable to carry out the following mixing prevention method. That is, a method for selecting a solvent for phase-separating a solvent used for a composition for a blue colored layer and a solvent used for a composition for an anti-fading layer, a layer for forming a blue colored layer formed on a transparent substrate And a method of performing a pre-bake treatment described later or an exposure / development treatment step described below before the layers for forming the fading prevention layer are mixed with each other.

  In this step, the above-described various coating methods can be appropriately selected and used, and among them, it is preferable to use a multilayer simultaneous coating method. This is because the manufacturing process of the manufacturing method of the color filter of the present invention can be simplified, and the color filter can be manufactured with high productivity.

(Ii) Blue colored layer composition The blue colored layer composition used in this step comprises a triarylmethane-based color material and a binder resin. The triarylmethane colorant and the binder resin used in this step can be the same as those described in the section “A. Color filter” described above, and thus the description thereof is omitted here. In addition, as said binder resin, it is preferable to use alkali-soluble resin.

  In addition to the above-described components, the blue colored layer composition can be added by appropriately selecting necessary components. Hereinafter, these components will be described.

(A) Photopolymerization initiator When an alkali-soluble resin is used as the binder resin of the composition for the blue colored layer, it is preferable to use a photopolymerization initiator from the viewpoint of promoting the curing reaction.

As the photopolymerization initiator, for example, 2,2′-azobisisobutyronitrile (AIBN), 2-methyl-1- [4- (methylthio) phenyl] -2-morpholinopropan-1-one and the like are preferable. .
Examples of commercially available photopolymerization initiators include trade names Irgacure 184, 369, 651, 819, and 907 manufactured by Ciba Specialty Chemicals Co., Ltd., and Darocur series manufactured by Merck. Can be mentioned.

  When using a photoinitiator, the quantity should just be adjusted suitably, For example, it is preferable to set it as 1 mass%-20 mass% with respect to the total mass of the total solid of the composition for blue colored layers.

(B) Solvent In order to adjust the viscosity, pigment dispersibility, and dispersion stability over time of the blue colored layer composition, a solvent can be used as necessary.
Examples of the solvent include alcohols such as isopropanol described in JP-A 2010-128310, ketones such as acetone and methyl ethyl ketone, aromatic hydrocarbons such as toluene and xylene, diethylene glycol dimethyl ether (also known as bis (2-methoxy). Ethyl) ether), glycol ethers such as propylene glycol monomethyl ether (also known as 1-methoxypropan-2-ol), ethyl acetate, propylene glycol monomethyl ether acetate (also known as 2-methoxy-1-methylethyl acetate), propylene glycol mono Ethyl ether acetate (aka 2-ethoxy-1-methylethyl acetate), 3-methoxybutyl acetate (aka 3-methoxybutyl acetate) and butyl carbitol acetate (aka acetic acid 2- 2-butoxyethoxy) ethyl) acetate esters such as and the like.
Of these, diethylene glycol dimethyl ether, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate and 3-methoxybutyl acetate are preferred.

  When the solvent is used, the amount thereof may be adjusted as appropriate. For example, the amount is preferably 10% by mass to 90% by mass with respect to the total mass of the blue colored layer composition.

(C) Other components As the blue colored layer composition, in addition to the above-described components, for example, a polymerization terminator, a chain transfer agent, a leveling agent, a plasticizer, a surfactant, an antifoaming agent, and a silane coupling An agent, an ultraviolet absorber, an adhesion promoter and the like can be used.
Among these, surfactants that can be used include, for example, polyoxyethylene lauryl ether, polyoxyethylene stearyl ether, polyoxyethylene oleyl ether, polyoxyethylene octyl phenyl ether, polyoxyethylene nonyl phenyl ether, polyethylene Examples include glycol dilaurate, polyethylene glycol distearate, sorbitan fatty acid esters, fatty acid-modified polyesters, and tertiary amine-modified polyurethanes. In addition, a fluorosurfactant can also be used.
Furthermore, examples of the plasticizer include dibutyl phthalate, dioctyl phthalate, and tricresyl. Examples of the antifoaming agent and leveling agent include silicon-based, fluorine-based, and acrylic compounds.

(Iii) Others The thickness of the blue colored layer forming layer formed in this step is not particularly limited as long as a desired blue colored layer can be formed.

  In the present invention, after the blue colored layer forming layer is formed, a pre-bake treatment may be performed.

(2) Exposure / development step The exposure / development step in the present invention is a step of patterning the blue colored layer forming layer by exposing and developing the blue colored layer forming layer.

  The exposure in this step is usually performed by irradiating exposure light through a photomask having a desired opening. Since the photomask, exposure light, exposure conditions, and the like used in this step can be the same as those used in a general color filter manufacturing method, description thereof is omitted here.

  Since the developer, development conditions, and the like used in the development process in this step can be the same as those used in a general color filter manufacturing method, description thereof is omitted here.

(3) Post-baking process The post-baking process in this invention is a process of forming a blue colored layer by performing a post-baking process to the layer for blue colored layer formation.

The temperature of the post-baking treatment in this step is not particularly limited as long as a desired blue colored layer can be formed. Usually, depending on the material of the blue colored layer, the solvent used for the blue colored layer composition, and the like. It is appropriately selected.
More specifically, the post-baking temperature is preferably in the range of 100 ° C. to 220 ° C., more preferably in the range of 130 ° C. to 210 ° C., and particularly preferably in the range of 150 ° C. to 200 ° C. This is because when the post-baking temperature is less than the above range, it may be difficult to sufficiently cure the blue colored layer. Moreover, it is because the material of a blue colored layer may deteriorate when the temperature of a post-baking process exceeds the said range.

2. Color fading prevention layer forming step In the present invention, the color fading preventing layer forming step is performed by applying a color fading preventing layer composition containing a resin on the blue colored layer forming layer before the post-baking treatment step. The anti-fading layer forming layer before the triarylmethane colorant in the blue colored layer forming layer is sublimated in the post-baking treatment step. It is a process which has a hardening process which hardens | cures and forms the fading prevention layer which has gas-barrier property.
Hereinafter, each step will be described.

(1) Composition fading process for anti-fading layer In the composition coating process for fading preventing layer in the present invention, the composition for fading preventing layer containing a resin is applied on the blue colored layer forming layer before the post-baking treatment process. This is a step of forming a layer for forming a fading prevention layer by applying to the layer.

(I) Method for forming anti-fading layer forming layer As a method for forming the anti-fading layer composition, it is possible to form an anti-fading layer on the blue colored layer forming layer before the post-baking treatment step. There is no particular limitation, and it may be a multilayer simultaneous coating method, that is, a method of coating the composition for color fading prevention layer together with the composition for blue color layer, and the color fading prevention layer after forming the layer for forming the blue color layer. The method of apply | coating the composition for an application may be sufficient.

  The multi-layer simultaneous coating method has been described in the above-mentioned section “1. Blue colored layer forming step”, and thus description thereof is omitted here.

  On the other hand, the method for applying the anti-fading layer composition after the formation of the blue colored layer forming layer may be a method of applying the anti-fading layer composition after the blue coloring layer composition applying step, and exposure. -The method of apply | coating the composition for anti-fading layer on the blue colored layer forming layer patterned after the image development process may be sufficient. Especially, it is more preferable to apply the anti-fading layer composition onto the blue colored layer forming layer patterned after the exposure / development process. In this case, the anti-fading layer composition may be applied in a pattern on the patterned blue colored layer forming layer, and the anti-fading layer composition so as to cover the entire colored layer side of the transparent substrate. Although a thing may be apply | coated, it is more preferable to apply | coat the composition for fading prevention layers so that the colored layer side whole surface of a transparent base material may be covered. By making it possible to form a fading prevention layer that also serves as a flattening layer, it is possible to reduce the number of steps in the method for producing the color filter of the present invention, thereby improving the production efficiency. Is possible.

  In addition, about the coating method of the specific composition for anti-fading layers, since it can be made the same as that of a general coating method, description here is abbreviate | omitted.

(Ii) Composition for fading prevention layer The composition for fading prevention layer used for this process contains resin.
Moreover, the said composition for anti-fading layer is suitably selected by the curing method of the anti-fading layer forming layer in the curing step described later.
For example, when the anti-fading layer forming layer is cured using light such as ultraviolet rays, the anti-fading layer composition is prepared to exhibit photocurability. Examples of the resin used in such a composition for preventing discoloration include the alkali-soluble resins described in the above section “A. Color filter”. If necessary, other components such as the photopolymerization initiator, the solvent, etc. described in the section of the blue colored layer composition are used.

  Moreover, when thermosetting the layer for forming a fading preventing layer, the composition for preventing fading is prepared so as to exhibit thermosetting properties. Examples of the resin used for such a composition for preventing discoloration include the thermosetting resins described in the above-mentioned section “A. Color filter”. Moreover, the other component demonstrated by the term of the composition for blue colored layers mentioned above as a thermal-polymerization initiator, a hardening | curing agent, a catalyst as needed is used. The thermopolymerization initiator, the curing agent, and the catalyst can be the same as those used for a resin member using a general thermosetting resin, and thus description thereof is omitted here.

  In the present invention, when the composition for a fading prevention layer has thermosetting properties, the fading prevention is performed before the triarylmethane colorant in the blue colored layer forming layer is sublimated in the post baking process. Although it will not specifically limit if a layer can be hardened, It is preferable that a hardening temperature is lower than the sublimation temperature of a triarylmethane type | system | group coloring material. This is because sublimation of the triarylmethane color material can be suitably prevented. In addition, since the curing step described later can be performed simultaneously with the post-baking treatment step of the blue colored layer, the number of steps of the method for producing the color filter of the present invention can be reduced, and the production efficiency is improved. It becomes possible to make it.

The curing temperature of the anti-fading layer forming layer is appropriately selected depending on the type of triarylmethane color material contained in the blue colored layer composition, but the triarylmethane color material The difference from the sublimation temperature is preferably 10 ° C. or higher, more preferably 20 ° C. or higher, and particularly preferably 30 ° C. or higher. A specific curing temperature of the layer for forming a fading prevention layer is preferably 200 ° C. or less, particularly preferably in the range of 100 ° C. to 200 ° C., particularly preferably in the range of 130 ° C. to 170 ° C. The lower limit of the curing temperature of the layer for forming the fading preventing layer is about 100 ° C. When the temperature is lower than the above temperature, it is difficult to cure the fading prevention layer forming layer itself, and it may be difficult to form the fading prevention layer itself.
Here, the curing temperature refers to the peak top temperature of the exothermic peak obtained by DSC (differential scanning calorimetry).

(Iii) Others As the thickness of the anti-fading layer forming layer formed in this step, it is possible to prevent the triarylmethane color material from sublimating from the blue colored layer forming layer in the post-baking treatment step. The thickness is not particularly limited as long as it is a certain thickness.

(2) Curing step In the curing step of the present invention, the anti-fading layer forming layer is cured before the triarylmethane colorant sublimates from the blue colored layer forming layer in the post-baking step. This is a step of forming a fading prevention layer having gas barrier properties.

  The curing step can be performed at any timing after the formation of the color fading prevention layer forming layer and before the triarylmethane colorant sublimates in the post-baking treatment step.

  Further, here, the curing method of the layer for forming the fading preventing layer in this step is appropriately selected depending on the resin or the like used in the composition for the fading preventing layer, and specifically, the layer for forming the fading preventing layer is irradiated with light such as ultraviolet rays. May be cured by irradiation, or may be cured by heating the anti-fading layer forming layer.

  When the anti-fading layer forming layer is cured by light irradiation, as the curing step, the curing step may be performed simultaneously with the exposure of the blue colored layer forming step, and the anti-fading layer forming layer is photocured. May be carried out separately, but it is more preferred to carry out simultaneously with the exposure in the blue colored layer forming step. Since the number of steps in the color filter manufacturing method of the present invention can be reduced, the manufacturing efficiency can be improved.

  On the other hand, when the anti-fading layer forming layer is cured by heating, the curing step may be performed simultaneously with the post-baking treatment step of the blue colored layer forming step, and before the post-baking treatment step, the anti-fading layer. Although the process of heat-curing the forming layer may be performed separately, it is more preferable to perform it simultaneously with the post-baking process of the blue colored layer forming process. Since the number of steps in the color filter manufacturing method of the present invention can be reduced, the manufacturing efficiency can be improved.

3. Other Steps The production method of the color filter of the present invention is not particularly limited as long as it is a production method having the blue colored layer forming step and the fading prevention layer forming step described above, and other necessary steps are appropriately selected. It is possible to add. As such a process, for example, a colored layer forming process for forming colored layers of other colors such as a red colored layer and a green colored layer, a light shielding part forming process for forming a light shielding part, and a planarization for forming a planarizing layer A layer formation process etc. can be mentioned.

4). Color Filter The color filter manufactured by the method for manufacturing a color filter of the present invention can be the same as that described in the above section “A. Color filter”, and thus the description thereof is omitted here.

  The present invention is not limited to the above embodiment. The above-described embodiment is an exemplification, and the present invention has substantially the same configuration as the technical idea described in the claims of the present invention, and any device that exhibits the same function and effect is the present invention. It is included in the technical scope of the invention.

  Hereinafter, the present invention will be described with reference to examples and comparative examples.

The abbreviations of the compounds used in the synthesis examples are as shown in parentheses.
Methyl methacrylate (MMA), acrylic acid (AA), 2-hydroxyethyl methacrylate (HEMA), diethylene glycol dimethyl ether (DMDG), 2,2′-azobisisobutyronitrile (AIBN), glycidyl methacrylate (GMA)

(Synthesis Example 1)
In a polymerization tank, 63 parts by mass of MMA, 12 parts by mass of AA, 6 parts by mass of HEMA and 88 parts by mass of DMDG were charged, stirred and dissolved, and then 7 parts by mass of AIBN was added and dissolved uniformly. Then, it stirred at 85 degreeC under nitrogen stream for 2 hours, and also was made to react at 100 degreeC for 1 hour. 7 parts by mass of GMA, 0.4 parts by mass of triethylamine and 0.2 parts by mass of hydroquinone were further added to the obtained solution, and the mixture was stirred at 100 ° C. for 5 hours to obtain a copolymer resin solution (solid content 50%). It was.

The following materials were mixed and stirred at room temperature to obtain a curable resin composition as a binder.
The above copolymer resin solution (solid content 50%) 16 parts by mass Dipentaerythritol pentaacrylate (trade name SR399 manufactured by Sartomer)
24 parts by mass Orthocresol novolac type epoxy resin (trade name Epicoat 180S70 manufactured by Yuka Shell Epoxy Co., Ltd.) 4 parts by mass 2-methyl-1- [4- (methylthio) phenyl] -2-morpholinopropan-1-one (Brand name Irgacure 907 manufactured by Ciba Specialty Chemicals Co., Ltd.)
4 parts by mass DMDG 52 parts by mass

<Preparation of Resin Compositions 1-3 for Blue Colored Layer>
The following materials were mixed and stirred at room temperature to prepare resin compositions 1 to 3 for a blue pixel color filter. The following blue pigment (PB1) is a triarylmethane color material.

(Blue colored layer resin composition 1)
3 parts by weight of blue pigment (PB1) 11 parts by weight of the curable resin composition (binder) 84 parts by weight of acetic acid-3-methoxybutyl (solvent) Polymer dispersant (trade name DISPERBYK2000, manufactured by Big Chemie Japan, solid) 40%) 2 parts by mass in terms of solid content

(Blue colored layer resin composition 2)
Blue pigment (PB1) 2 parts by weight Blue pigment (PB15: 6) 1 part by weight The curable resin composition (binder) 11 parts by weight Acetic acid-3-methoxybutyl (solvent) 84 parts by weight Polymer dispersing agent (BIC Chemie Japan) (Product name DISPERBYK2000, solid content 40%) 2 parts by mass in terms of solid content

(Blue colored layer resin composition 3)
Blue pigment (PB15: 6) 3 parts by mass The above curable resin composition (binder) 11 parts by mass Acetic acid-3-methoxybutyl (solvent) 84 parts by mass Polymer dispersant (trade name DISPERBYK2000 manufactured by Big Chemie Japan Co., Ltd.) , Solid content 40%) 2 parts by mass in terms of solid content

(Resin composition for fading prevention layer 1)
Epicoat 828 (Japan Epoxy Resin Co., Ltd.) 10 parts by mass Acetic acid-3-methoxybutyl (solvent) 90 parts by weight

(Resin composition for fading prevention layer 2)
X-41-1053 (manufactured by Shin-Etsu Silicone) 10 parts by mass 3-methoxybutyl acetate (solvent) 90 parts by weight

(Resin composition for anti-fading layer 3)
7 parts by mass of the curable resin composition Epicoat 828 (manufactured by Japan Epoxy Resin Co., Ltd.) 3 parts by mass 3-methoxybutyl acetate (solvent) 90 parts by mass

<Preparation of blue colored layer substrate for evaluation>
[Example 1]
The prepared blue colored layer resin composition 1 was applied on a 0.7 mm thick glass substrate (“NA35” manufactured by NH Techno Glass Co., Ltd.) using a spin coater. Then, it heat-dried for 3 minutes on an 80 degreeC hotplate. A photomask was placed with a gap of 200 μm from the substrate, and ultraviolet rays of 60 mJ / cm ² were irradiated using an ultrahigh pressure mercury lamp. Subsequently, it was immersed in 0.05 wt% potassium hydroxide aqueous solution (liquid temperature 23 degreeC) for 1 minute, and alkali development was carried out, and only the uncured part of the coating film of the resin composition 1 for blue colored layers was removed. By post-baking for 30 minutes in a clean oven at 170 ° C., a blue colored layer substrate for evaluation having a blue colored layer having a predetermined relief pattern was obtained. In addition, about the thickness of the blue colored layer, it adjusted so that a chromaticity coordinate might become the value shown in following Table 1. FIG.

[Example 2]
A blue colored layer substrate for evaluation was obtained in the same manner as in Example 1 except that the resin composition 2 for blue colored layer was used.

[Example 3]
A blue colored layer substrate for evaluation was obtained in the same manner as in Example 1 except that the resin composition 1 for a fading preventing layer was applied using a spin coater after alkali development to form a 0.3 μm fading preventing layer.

[Example 4]
A blue colored layer substrate for evaluation was obtained in the same manner as in Example 3 except that the resin composition 2 for fading prevention layer was used.

[Example 5]
A blue colored layer substrate for evaluation was obtained in the same manner as in Example 1, except that the resin composition 3 for blue fading layer was applied to the resin composition 3 for fading preventing layer using a multilayer batch coater.

[Comparative Example 1]
A blue colored layer substrate for evaluation was obtained in the same manner as in Example 1 except that the resin composition 3 for blue colored layer was used.

<Evaluation>
Table 1 shows the chromaticity coordinates, film thickness, and patterning accuracy of the blue colored layer substrates of Examples 1 to 5 and Comparative Example 1. ○ in Table 1 indicates that the blue colored layer can be formed in a desired thickness and pattern, and × indicates that the blue colored layer is thick and thus cannot be sufficiently exposed. This indicates that the pattern could not be formed.

  By using a triarylmethane-based color material, even when the color density of the blue colored layer is set to a desired value, the colored layer can be formed thin.

DESCRIPTION OF SYMBOLS 1 ... Transparent base material 2B ... Blue colored layer 2B '... Blue colored layer forming layer 2R ... Red colored layer 2G ... Green colored layer 3 ... Light-shielding part 4 ... Fading prevention layer 4' ... Fading prevention layer forming layer 10 ... Color filter

Claims (3)

A blue colored layer composition coating step for forming a blue colored layer forming layer by coating a blue colored layer composition containing a triarylmethane colorant and a binder resin on a transparent substrate, the blue colored layer An exposure / development process for patterning the blue colored layer forming layer by exposing and developing the forming layer, and a blue colored layer by subjecting the patterned blue colored layer forming layer to a post-baking process A blue colored layer forming step having a post-baking treatment step to form,
A fading prevention layer composition coating step for forming a fading prevention layer forming layer by applying a resin-containing fading prevention layer composition on the blue colored layer forming layer before the post-baking treatment step; and Curing for curing the fading prevention layer forming layer to form a fading preventing layer having a gas barrier property before the triarylmethane colorant in the blue colored layer forming layer is sublimated in the post baking process. A fading prevention layer forming step having a step;
The manufacturing method of the color filter for near-ultraviolet light emitting element light sources characterized by having. 2. The near-ultraviolet light-emitting element light source color filter according to claim 1 , wherein the anti-fading layer composition is cured at a temperature lower than a sublimation temperature of the triarylmethane colorant. Method. In the blue color layer composition coating step and the color fading prevention layer composition coating step, the blue color layer composition and the color fading prevention layer composition are collectively applied using a multilayer simultaneous coating method. The color filter for near-ultraviolet light emitting element light source according to claim 1 or 2 , wherein the blue colored layer forming layer and the fading preventing layer forming layer are simultaneously formed on the transparent substrate by Production method.

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