JP2007322571A - Optical filter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical filter used for a display device and including a color correction function layer and/or a near infrared light cut function layer, the optical filter being manufactured by the streamlined manufacturing process of the color correction function layer and/or the near infrared light cut function layer, therefore being suitable for use in a variety of models of display devices each requiring small number of the filters, i.e., suitable for high-mix low-volume production, and having little hue spots. <P>SOLUTION: The optical filters are characterized in that the color correction function layer and/or the near infrared light cut function layer are formed by sublimation transfer of sublimation dye. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an optical filter, and more particularly, to an optical filter with improved functions and manufacturing processes of a color correction functional layer and / or a near-infrared cut functional layer disposed or attached to the front surface of an optical display device. .

In recent years, as the display screens of various computer displays, game consoles, televisions, etc. in office automation equipment, factory automation equipment, etc. have increased, display devices have changed from the conventional cathode ray tube type, which is thicker, to thinner liquid crystal display devices and plasma displays. A so-called flat panel display such as a panel device (PDP) is moving.

PDPs and cold cathode ray tubes (CRTs) are required to have an excellent electromagnetic wave cutting function because of the strength of electromagnetic waves leaking from the front surface, and an electromagnetic wave cutting functional layer is provided on the front surface of the display surface. In particular, in the PDP, near infrared rays derived from emission of an inert gas such as Ne gas or Xe gas in the cell of the light emission source are further emitted from the front surface. This near-infrared ray is normally cut by passing through a thin-film layer (near-infrared cut function layer) containing a dye that absorbs near-infrared rays because it is close to the operating wavelength of the device and may cause malfunction of the home appliance. ing.

However, since this dye that absorbs near infrared rays generally absorbs even in the visible region, there is a deviation in hue in the display image by providing a near infrared cut functional layer. There is a hue bias in the balance of the three primary colors of the light emitting light source, and it is difficult to express a beautiful white color due to the hue bias. Therefore, in order to neutralize the hue bias and express a beautiful white color, usually a color correction pigment is further combined with the near infrared cut layer, or another layer (color correction function layer) having this color correction function is provided. Is provided. In the case of a liquid crystal display device, usually, white light is used as a light source, and this is transmitted through a dye layer (three primary color generation functional layers, so-called color filters) finely patterned in various forms to provide a three primary color light source. Is generated.

Further, from the viewpoint of improving visibility, the surface of the optical display device is usually provided with an antireflection functional layer or an antiglare functional layer, and the electromagnetic wave cutting functional layer, the near infrared cutting functional layer, or the color correction. These functional layers together with the functional layer, the three primary color generation functional layers, and the like are collectively configured as an optical filter, and are disposed on the front surface of the display surface as a front plate or directly attached to the display surface. As described above, optical filters including various optical functional layers are used in optical display devices, although there are differences in the combinations of functions required.

When the above optical filter is viewed from the structural aspect, for example, according to the required function, these functions are combined with various functional layers such as an electromagnetic wave cut function, a near infrared ray cut function, a color correction function, an antireflection function, and an antiglare function. Has been proposed which is laminated on a transparent substrate such as a glass plate or an acrylic plate to form a front plate and is arranged on the front surface of the display device. (See Patent Document 1). However, the above-mentioned front plate is constructed by laminating layers having various functions in order on a transparent base material such as glass or acrylic plate, so the whole is a hard plate and thick, and used In this case, the display device is placed on the front surface of the display device, so that the entire display device is heavy and thick. For this reason, an optical film of a type in which a transparent substrate such as glass or an acrylic plate is omitted and the whole is directly attached to the front surface of the display surface via an adhesive layer has been proposed (see Patent Document 2).

JP 2002-123182 A JP 2004-069931 A

By the way, among the layers having those functions, the three primary color generation functional layer of the liquid crystal display device, the layer containing a near infrared cut dye, or the near infrared cut functional layer containing a color correction dye is usually (1). Use a colored film that is blended or impregnated with a color correction dye in a transparent resin, or (2) a coating solution in which these dyes are mixed and uniformly dispersed in a resin solution dissolved in a solvent. Use a colored layer coating film that is applied uniformly or in a pattern on a base film, printed, and dried to form a dye-containing layer. (3) Use these dyes for bonding between functional layers. The method of adding to the adhesive layer currently used and making it a colored adhesive layer etc. are mentioned.

By the way, among the near-infrared cut functional layer and the color correction functional layer, the near-infrared cut functional layer has a wavelength distribution of the near-infrared cut characteristic of the dye to some extent because the near-infrared cut functional layer is a wavelength band invisible. Even if there is a change in the density distribution of the pigment, the viewer will not perceive it. However, the hue of the near-infrared cut pigment in the visible light region and the neutralization of the bias by the light source in the PDP are not detected. For this reason, the distribution spots of the color correction pigment used for this cause a deterioration in the image quality of the image displayed in the visible light region. For example, when producing the above colored film or colored layer coating film, or when providing a colored pressure-sensitive adhesive layer, there are pigment distribution spots in them, and thickness spots and smears in those layers. As a result, it causes hue spots and causes a deterioration in the image quality of the displayed image. In addition, these films need to be mass-produced because of the long manufacturing process despite the fact that various types of standards are produced depending on the type of light source, the type of pigment used in the near-infrared cut functional layer and the color correction functional layer. In addition, when an adhesive is used, the residual adhesive after production becomes a loss.

That is, the problem of the present invention is that there are few hue spots, and the manufacturing process of the layer (color correction functional layer, near infrared cut functional layer) containing the color correction dye and the near infrared cut dye has been improved, for example, a small amount The object is to provide an optical filter suitable for production of varieties.

That is, the gist of the present invention is an optical filter including a color correction functional layer and / or a near infrared cut functional layer, wherein the color correction functional layer and / or the near infrared cut functional layer is formed by sublimation transfer of a sublimable dye. The present invention relates to an optical filter.

In the optical filter of the present invention, since the color correction functional layer is formed by sublimating and transferring a sublimable dye, a drying step required in a wet process such as a conventional colored film or a colored layer coating film is provided. Furthermore, since the sublimation dye is transferred to the substrate in a short time, the time required for forming the color correction functional layer is greatly shortened and the manufacturing process is simplified. Increased efficiency in low-volume production. Further, in the product characteristics, a dedicated base material and a transparent pressure-sensitive adhesive layer for the color correction functional layer and / or the near infrared cut functional layer can be omitted as desired. Further, the sublimable dye layer, which is a main element of the color correction functional layer, is formed by the sublimation / transfer mechanism of the sublimable dye, so that the thickness unevenness is small, and therefore the color unevenness on the display surface is hardly generated. At the same time, since the surface of the color correction functional layer (sublimation dye layer) is formed smoothly, the smoothness of the entire optical filter is also improved.

The color correction functional layer and / or near-infrared cut functional layer of the optical filter of the present invention is substantially composed of a sublimable dye layer.

The optical filter may be configured in combination with various functional layers such as an antireflection functional layer, an antiglare functional layer, or an electromagnetic wave cutting functional layer, if necessary, in addition to the color correction functional layer and / or the near infrared cut functional layer. However, it is usually configured by combining all of the antireflection functional layer, the antiglare functional layer, and the electromagnetic wave cutting functional layer. As the layer configuration of such an optical filter, for example, a front plate type in which the above layers are combined in an appropriate order on a transparent base material such as glass and an acrylic plate, and a transparent base such as the above glass and acrylic plate are used. It includes a film-type one in which only each functional layer is laminated on each other without using a material, and is directly attached to the front surface of the display device via an adhesive layer.

The order of lamination and the form of lamination of the functional layers constituting the above-described front plate type optical filter are not particularly limited, but typical examples include the following examples.
(Antireflection functional layer) / (Color correction functional layer) / (Transparent adhesive layer) / Semi-tempered glass plate / (Transparent adhesive layer) / (Electromagnetic wave cut functional layer) / (Transparent adhesive layer) / (Near infrared ray) Cut functional layer) /

Further, the order of lamination and the form of lamination of the functional layers constituting the film type optical filter are not particularly limited, but examples of the configuration include the following.
(Antireflection functional layer) / (Color correction functional layer) / (Transparent adhesive layer) / (Electromagnetic wave cut functional layer) / (Transparent adhesive layer) / (Near infrared cut functional layer) / (Transparent adhesive layer) / (Release paper)

The functional layer incorporated in the optical filter of the present invention is not limited to the functional layer shown in the above configuration example. For example, when the near-infrared cut dye is sublimable, the near-infrared cut functional layer is color-corrected. It can be configured as a single layer together with the functional layer. Further, the stacking order of each layer can be changed, the antireflection functional layer can be replaced with an antiglare functional layer, and a light quantity adjusting functional layer and other functional layers can be additionally incorporated. In addition, although the color correction functional layer and the near-infrared cut functional layer in the above configuration examples usually include a base material layer, the essential part of the functional layer (part not including the base material) is transparent adhesive. It can also be directly laminated on another adjacent functional layer surface (essential partial surface of the functional layer or base material layer surface) without intervening layers.

When the functional layers are bonded to each other, the transparent adhesive used is, for example, natural rubber, SBR, butyl rubber, recycled rubber, acrylic, polyisobutylene, silicone rubber, polyvinyl butyl ether. Among them, acrylic type is preferable. As the pressure-sensitive adhesive, those described in “High-performance adhesives / pressure-sensitive adhesives” edited by the Polymer Society of Japan can be used. The transparent pressure-sensitive adhesive layer is obtained by directly applying a coating solution in which these pressure-sensitive adhesives are dissolved or dispersed in water or other solvent to the adhesive surface and drying it, but a polyethylene terephthalate (PET) film having good peelability in advance. The pressure-sensitive adhesive layer can also be provided by transferring the pressure-sensitive adhesive layer onto a support such as.

As the near-infrared-cutting dye constituting the near-infrared-cutting functional layer, a dye having a near-infrared cutting function and well transmitting in the visible light region is used and can be selected from known ones. Examples of such dyes include nitroso compounds that are organic substances and metal complex salts thereof, polymethine dyes (cyanine, oxonol, croconium, squarylium, pyrylium, and azurenium), thiopyrylium dyes, and tetradehydrocholine dyes. Dye, triphenylmethane dye, dithiol complex salt compound, phthalocyanine compound, naphthalocyanine compound, triallylmethane dye, imonium dye, diimmonium dye, naphthoquinone compound, anthraquinone compound, amino compound, aminium salt compound Alternatively, carbon black, which is an inorganic substance, indium tin oxide, antimony tin oxide, an oxide of a metal belonging to Group 4A, 5A, or 6A of the periodic table, carbide, boride, or the like can be given.

Specific examples of the above-mentioned near-infrared cut dye include EX color 802K, EX color 803K, EX color 814K (all are trade names manufactured by Nippon Shokubai Co., Ltd.), IR-750, IRG-002, IRG-003. , IRG-022, IRG-023, IRG-820, CY-2, CY-4, CY-9, CY-20 (all are trade names manufactured by Nippon Kayaku Co., Ltd.), PA-001, PA-1005, PA-1006, SIR-114, SIR-128, SIR-130, SIR-159 (all are trade names manufactured by Mitsui Toatsu Chemical Co., Ltd.). Among them, the near-infrared cut function preferably has a near-infrared light transmittance of 30% or less at a wavelength of 750 to 1200 nm, more preferably 25% or less, still more preferably 20% or less, and The total light transmittance in the visible light region having a wavelength of 450 to 650 nm is preferably 45% or more, more preferably 60% or more, and still more preferably 80% or more.

If necessary, the near-infrared-cutting dye can be used in combination with other near-infrared-cutting agents. In particular, from the viewpoint of transparency in the visible region and infrared-cutting performance, the above-mentioned dyes and polymethine are used. It is preferably combined with a near-infrared dye selected from a dye, a diimmonium dye, a phthalocyanine compound and a naphthalocyanine compound.

As a method of forming a near-infrared cut function layer using the above-mentioned near-infrared cut dye, (1) a method of dispersing the near-infrared cut dye in a transparent resin to form a colored film, and (2) dissolving in a solvent A method in which a coating solution in which these pigments are mixed and uniformly dispersed in a resin solution is coated on a transparent base film and dried to form a near-infrared cut resin layer to form a colored coating film; (3) A known method such as a method of adding the above-mentioned dye to the pressure-sensitive adhesive layer used for bonding between the functional layers can be adopted. If the dye has sublimation / thermal transfer properties, the color correction functional layer described below Similarly, the sublimation transfer method can be applied, and this dye can be blended with the color correction dye of the color correction functional layer.

The color correction functional layer can be usually formed by sublimation and transfer onto a substrate from an ink ribbon containing a sublimable dye. As the surface on which the color correction functional layer is formed, a special base material for the color correction functional layer may be prepared and used as the surface, but the outer surface of another functional layer, for example, the antireflection functional layer described above Further, the electromagnetic wave functional layer, the near infrared cut functional layer, and the like can be used together. In the case of combined use, it is possible to save raw materials and reduce the mass and thickness of the optical filter as a product by not using a dedicated base material. The surface on which the dye of the base material is sublimated is transferred to ensure stability of the transferred dye in both cases where the base material is specially prepared and when the base material of another functional layer is also used. In order to prevent the ink ribbon from being held or adhered to the thermal transfer holder, it is preferable to perform a receptivity improving process.

The receptivity improving treatment method is not particularly limited, and examples thereof include a method of modifying a base material layer material and a method of forming a receptive layer directly or via an adhesive on the base material surface. .

Examples of the method for modifying the above-mentioned base material layer material include a method of containing a silicone compound in the thermoplastic resin constituting the base material. As a resin constituting such a base material, 100 parts by mass of a copolymerized polyester resin obtained by substituting 10 to 70 mol% of an ethylene glycol component of a polyethylene terephthalate resin with cyclohexanedimethanol, ethylene, vinyl acetate, ethyl acetate, acrylic 0.1-2 parts by mass of a copolymer obtained by adding and copolymerizing at least one selected from the group consisting of acid, acrylic acid ester, methacrylic acid, methacrylic acid ester, unsaturated carboxylic acid and ionomer, preferably 0 The thing containing 0.5-1.5 mass parts can also be used. By adding 0.1 to 2 parts by mass of the ethylene copolymer, it is possible to suppress sticking of the ink ribbon during printing, and the amount of the silicone compound added can be suppressed.

Examples of the silicone compound include compounds containing one or more selected from the group consisting of silicone oils and silicone-modified resins. Silicone oils include dimethyl silicone oil, methylphenyl silicone oil, amino modified silicone oil, epoxy modified silicone oil, carboxyl modified silicone oil, carbinol modified silicone oil, acrylic modified silicone oil, alcohol modified silicone oil, vinyl modified silicone oil, Fluorine-modified silicone oil, alkylaralkyl polyether-modified silicone oil, epoxy / polyether-modified silicone oil, polyether-modified silicone oil, and the like. Examples of silicone-modified resins include silicone / acrylic copolymers, silicone-crosslinked acrylic resins, siloxane-crosslinked acrylic resins, silicone / urethane copolymers, silicone-modified polyimide resins, and silane block acrylic resins. In addition, a resin obtained by grafting the aforementioned silicone oil can be used.

0.1-10 mass parts is preferable with respect to 100 mass parts of thermoplastic resins, and, as for the addition amount of said silicone compound, More preferably, it is 0.5-8 mass parts. If the amount is less than 0.1 parts by mass, the ink ribbon is liable to stick to the sublimation transfer holder, and if it exceeds 10 parts by mass, the compatibility with the thermoplastic resin is poor, and defects such as unevenness and unevenness increase. In addition, the above thermoplastic resin may further include a compatibilizer, a stabilizer, a lubricant, a reinforcing agent, a processing aid, a pigment, an antistatic agent, and an antioxidant as long as the transparency is not substantially impaired. Agents, neutralizing agents, ultraviolet absorbers, dispersants, thickeners, other inorganic fillers, resin modifiers, and the like.

Examples of the method for forming the receiving layer include polyester resins such as polyester resins reacted with long-chain dicarboxylic acid polyols used as sublimable dye receiving layers, polyvinyl butyral resins, and polyacrylic resins. Acid ester resin, polycarbonate resin, polyvinyl acetate, styrene acrylate resin, acrylonitrile-styrene copolymer resin, vinyl toluene acrylate resin, polyurethane resin, polyamide resin (nylon), urea resin, polycaprolactone resin, polystyrene resin, polyol resin A method in which a vinyl acetate resin, a polyvinyl chloride resin, or the like is dissolved in an organic solvent such as toluene, methyl ethyl ketone, metal isobutyl ketone, etc., applied to the surface of the substrate by a known coating method or printing method, and dried. Or the above How to melt-extrusion laminating a resin on the substrate surface, and the like. These resins can contain a metal complex salt, an ultraviolet absorber, a phenol derivative, etc. as a dye stabilizer, and silicone for preventing sticking between the heat sublimable ink ribbon and the sublimable dye receiving layer. Compounds and other various additives can also be contained.

Examples of the resin for forming the receiving layer with the further improved acceptability include, for example, an acid value of 80 or more, preferably about 80 to 250, more preferably about 90 to 200, more preferably described in JP-A-9-118836. Is a photocurable resin composition containing a resin of about 95 to 180, more preferably about 98 to 170. Examples of the resin include a resin containing a carboxylic acid group or a carboxylic ester group, and a polymer of (meth) acrylic acid (ester). These may be used in combination. In addition, such a photocurable resin composition usually contains a photopolymerization initiator and other components such as a photocrosslinking agent, a photopolymerizable cured film modifier, and a thermosetting agent as necessary. Is done.

Examples of the photopolymerization initiator include dibenzyl; benzoin ether; benzoin isobutyl ether; benzoin isopropyl ether; benzophenone; benzoylbenzoic acid; methyl benzoylbenzoate; 4-benzoyl-4′-methyldiphenyl sulfide; -N-butoxyethyl-4-dimethylaminobenzoate; 2-chlorothioxanthone; 2,4-diethylthioxanthone; 2,4-diisopropylthioxanthone; dimethylaminomethylbenzoate; isoamyl p-dimethylaminobenzoate; 3,3'-dimethyl -4-methoxybenzophenone; 2,4-dimethylthioxanthone; 1- (4-dodecylphenyl) -2-hydroxy-2-methylpropan-1-one; 1-hydroxycyclo Xylphenylketone; 2-hydroxy-2-methyl-1-phenylpropan-1-one; 1- (4-isopropylphenyl) -2-hydroxy-2-methylpropan-1-one; isopropylthioxanthone; methylobenzoylpho Mate; 2-methyl-1- [4- (methylthio) phenyl] -2-morpholinopropan-1-one and the like. These photopolymerization initiators can be used alone or in admixture of two or more, and are 0.5 to 10% by mass, preferably 0.5 to 5% by mass, based on the total mass of the photopolymerizable compound. It is added within the range.

The photocrosslinking agent is a monomer, oligomer, prepolymer or the like that can be crosslinked or polymerized by light. Examples of such monomers, oligomers and prepolymers include, for example, ethyl acrylate, hydroxyethyl methacrylate, ethylene glycol dimethacrylate, pentaerythritol triacrylate, pentaerythritol trimethacrylate, dipentaerythritol hexaacrylate, dipentaerythritol hexamethacrylate, Esters of monohydric or polyhydric alcohol acrylic acid or methacrylic acid such as isocyanuric acid ethylene oxide modified triacrylate; (meth) acrylic to polyester prepolymer obtained by condensing polyhydric alcohol with monobasic acid or polybasic acid Polyester (meth) acrylate obtained by reacting acid; after reacting a compound having a polyol group and two isocyanate groups, (meth) acrylate Polyurethane (meth) acrylate obtained by reacting acid; bisphenol A type epoxy resin, bisphenol F type epoxy resin, novolak type epoxy resin, polycarboxylic acid glycidyl ester, polyol polyglycidyl ester, aliphatic or cycloaliphatic epoxy resin, Examples include ordinary photopolymerizable resins such as epoxy (meth) acrylate obtained by reacting an epoxy resin such as an amine epoxy resin, a triphenolmethane type epoxy resin, and a dihydroxybenzene type epoxy resin with (meth) acrylic acid.

Examples of the photopolymerizable cured film modifier include unsaturated group-containing polycarboxylic acid resins other than the above easily developable unsaturated group-containing polycarboxylic acid resins, such as bisphenol A type epoxy resins and bisphenol F type epoxy resins. Resin, novolac type epoxy resin, polycarboxylic acid glycidyl ester, polyol polyglycidyl ester, aliphatic or cycloaliphatic epoxy resin, amine epoxy resin, triphenolmethane type epoxy resin, dihydroxybenzene type epoxy resin and ) Epoxy (meth) acrylate-carboxylic acid adduct obtained by reacting an acid anhydride with a hydroxy group obtained by reacting acrylic acid; copolymerizable with maleic anhydride, ethylene, propene, isobutylene, styrene, vinylphenol, Acrylic acid, acrylic acid es A compound obtained by reacting an acrylate having an alcoholic hydroxyl group such as hydroxyethyl acrylate or an acrylate having an epoxy group such as glycidyl methacrylate with a maleic anhydride portion of a copolymer with a monomer such as acrylamide or acrylamide; Examples thereof include a compound obtained by further reacting an acrylic acid with the —OH group of an acrylate copolymer having an alcoholic hydroxy group such as an acid, an acrylic ester and hydroxyethyl acrylate.

The photopolymerizable compound as described above is used alone or in combination, and the total amount thereof is 50 to 150 parts when the mass of the easily developable unsaturated group-containing polycarboxylic acid resin is 100 parts, More preferably, it is used in the range of 80 to 120 parts.

The thermosetting agent is a compound that can be crosslinked or polymerized by heat, and examples thereof include an epoxy compound. The epoxy compound is thermally reacted with the above easily developable unsaturated group-containing polycarboxylic acid resin and the like to improve heat resistance by crosslinking. Specific epoxy compounds include bisphenol A type epoxy resin, bisphenol F type epoxy resin, novolac type epoxy resin, polycarboxylic acid glycidyl ester, polyol polyglycidyl ester, aliphatic or cycloaliphatic epoxy resin, amine epoxy resin, A phenol methane type epoxy resin, a dihydroxybenzene type epoxy resin, etc. are mentioned. Such an epoxy compound is used alone or in combination, and the total amount thereof is 5 to 30 parts, more preferably, when the mass of the easily developable unsaturated group-containing polycarboxylic acid resin is 100 parts. In the range of 10 to 20 parts.

For example, when a polymer of the above (meth) acrylic acid (ester) is used as the resin having an acid value of 80 or more, since this polymer is non-photocurable, there are many other than the photopolymerization initiator. A functional resin and a photocrosslinking agent are required, and further components such as a photopolymerizable cured film modifier and a thermosetting agent are blended as necessary. Examples of the polyfunctional resin include the above unsaturated group-containing polycarboxylic acid resins. Examples of the photopolymerization initiator, photocrosslinking agent, photopolymerizable cured film modifier, and thermosetting agent include those described above.

The photocurable resin composition used in the dye-receiving layer of the transparent substrate used in the present invention can be obtained by mixing the above-described components in the proportions described above. Mixing is usually performed in an organic solvent to obtain a photocurable resin composition solution. Specific examples of the organic solvent include ethyl cellosolve acetate, ethylene glycol monoisopropyl ether acetate, propylene glycol monomethyl ether acetate, butyl cellosolve acetate, isopropyl cellosolve acetate, methoxyisopropyl glycol acetate, ethoxyisopropyl glycol acetate, and diglyme. However, it is not limited to these. It is desirable to dilute this solution with an organic solvent to an appropriate viscosity in a coating machine as described below.

The photocurable resin composition solution obtained as described above is applied to the substrate surface and dried after filtering for the purpose of removing foreign substances. Filtering is performed using a conventional filter.

In the above application method, application to the transparent substrate is performed by a known method using various coaters such as a spin coater and a roll coater. The thin film of the photocurable resin composition coated and dried on the transparent substrate is irradiated with active energy rays such as electron beams, ultraviolet rays, and visible rays to form a cured film. This cured film becomes a dye-receiving layer. The film thickness of the cured film is about 0.1 to 5 μm, preferably about 0.5 to 3 μm.

The ink ribbon is obtained by forming a sublimable dye layer on a base sheet.
The sublimable dye is not particularly limited, but is preferably a dye that sublimes or evaporates at a temperature of 70 to 260 ° C. under atmospheric pressure. Examples of such dyes include azo compounds, anthraquinones, quinophthalones, styryls, diphenylmethanes, triphenylmethanes, oxazines, triazines, xanthenes, methine compounds, azomethine compounds, acridines, diazines, etc. And basic dyes. Among them, 1,4-dimethylaminoanthraquinone, brominated or chlorinated 1,5-dihydroxy-4,8-diamino-anthraquinone, 1,4-diamino-2,3-dichloro-anthraquinone, 1-amino-4-hydroxy Anthraquinone, 1-amino-4-hydroxy-2- (β-methoxyethoxy) anthraquinone, 1-amino-4-hydroxy-2-phenoxyanthraquinone, methyl ester of 1,4-diaminoanthraquinone-2-carboxylic acid, ethyl ester Propyl ester or butyl ester, 1,4-diamino-2-methoxyanthraquinone, 1-amino-4-anilinoanthraquinone, 1-amino-2-cyano-4-anilino (or cyclohexylamino) anthraquinone, 1-hydroxy- 2- (p-acetoami Phenylazo) -4-methyl benzene, 3-methyl-4- (nitrophenylazo) pyrazolone, 3-hydroxy quinophthalone and the like are preferable.

Examples of the sublimable dye include quinoline dyes, styryl dyes, and azo dyes from another viewpoint. Examples of the quinoline dye include compounds of the following formula (i), and examples of the styryl dye include compounds of the following formula (ii). Further, as the above azo dyes, focusing on the coupling component, for example, pyrazole azo dyes (for example, compounds of the following formula (iii)), aniline azo dyes (for example, the compounds of the following formulas (iv) and (v)) Specific examples include monoazo dyes such as pyridone azo dyes (for example, compounds of the following formula (vi)), and pyridone monoazo dyes and pyrazole monoazo dyes are preferred from the viewpoint of sublimation and hue.

Specific examples of the pigment include C.I. I. Examples of red pigments such as 1, 3, 8, 9, 14-1, 16, 41, 42, 54, 60, 77, 116, 125 (S) of Disperse Yellow include C.I. I. Disperse Red 1, 4, 6, 11, 15, 17, 50, 55, 59, 60, 73, 83, 111, 135, 228 (S), etc. I. Disperse Blue 33, 56, 106, 241 and C.I. I. Solvent Blue 36, 83, 90, 105, 112, 114 (S) and the like can be mentioned.

Next, the ink ribbon is sublimated by dissolving the sublimable dye and the binder resin in a solvent on a base sheet (film) having excellent heat resistance and surface smoothness, and applying and drying by a known method. The sheet is obtained by forming the dye-containing layer. The above dyes are usually formed into an ink ribbon that contains three primary colors of red, green, and blue (R, G, and B) separately, and each transfer density is adjusted in accordance with the hue required as a color correction function layer at the time of use. However, if the color of the light source of the corresponding display device and the hue of the near-infrared cut function layer do not change, the color correction function layer needs the dye contained in the sublimation dye-containing layer of the ink ribbon. It is practical to use a combination of various types of sublimable dyes that can transfer various hues. The above-mentioned formulation of sublimable dyes is neutral in consideration of the hue of each dye and the sublimation characteristics under the sublimation transfer conditions, the hue of the near-infrared cut functional layer, and the light source hue of the display device. It sets suitably so that it may become.

As said base material sheet, a polyester film, a polystyrene film, a polysulfone film, a polyimide film, a polycarbonate film, a triacetyl cellulose film, a polyvinyl alcohol film, a polypropylene film etc. are used, for example.

The binder resin is preferably a resin in which a sublimable dye is dissolved or dispersed and held in a monodispersed state as much as possible, and has a low affinity with the dye and easily releases the dye when heated, such as a butyral resin, Examples include acetal resins and polymethyl methacrylate-modified acetal resins. The mixing ratio of the sublimable dye and the binder resin is usually 1: 9 to 8: 2. The thickness of the sublimable dye-containing layer varies depending on the purpose of use, but is usually about 0.5 to 10 μm, preferably about 4 to 8 μm.

The color correction functional layer is formed by superimposing the ink surface of the ink ribbon obtained as described above on the exclusive or shared base material surface or the receiving layer formed on the surface, so that a thermal head or laser The ink layer is heated by heating means such as light, and the sublimable dye in the ink is formed by transferring the sublimable dye of the present invention. At this time, if the formulation of the pigment of the above ink ribbon does not match the hue required for the color correction function layer such as the three primary colors, the transfer density is adjusted for each hue ribbon to match the required hue. However, the transfer process is repeated. In the transfer process, the surface of the substrate to be transferred and the surface of the ink ribbon may be in close contact with each other, and there is an interval of up to about 500 μm, preferably up to about 300 μm, more preferably up to about 200 μm. May be.

In addition, the optical filter as the three primary color generation functional layer for the liquid crystal display device usually uses an ink ribbon of the three primary colors of light, and uses the electronic data corresponding to the arrangement pattern of the fine unit primary color light source as a manuscript to As in the case of forming the correction functional layer, the ink layer is heated using a printer having a heating means such as a thermal head or a laser beam, and the sublimable dye in the ink layer is sublimated and transferred to obtain the dye having the three primary color pattern arrangement. It can be manufactured by forming a layer.

As the antireflection functional layer, known layers can be used in combination. For example, an antireflection layer described in JP-A-2004-069931 is exemplified. The antireflection layer described in the above publication is formed by alternately laminating a material having a high refractive index and a material having a low refractive index on a substrate made of polyester or the like, and forming a multilayer (multi-coat). Thus, reflection on the surface is suppressed and a good antireflection effect can be obtained. This antireflection layer is usually formed by alternately depositing a layer of a low refractive index material typified by SiO ₂ and a layer of a high refractive index material typified by TiO ₂ , ZrO ₂ or the like by vapor deposition or the like. It can be formed by laminating by a phase method or a sol-gel method.

The refractive index of the low refractive index layer is preferably 1.45 or less in order to improve the antireflection effect. Examples of the material having these characteristics include LiF (refractive index n = 1.4), MgF ₂ (n = 1.4), 3NaF · AlF ₃ (n = 1.4), AlF ₃ (n = 1. 4) Inorganic low-reflective materials in which inorganic materials such as Na ₃ AlF ₆ (n = 1.33) and SiO ₂ (n = 1.45) are finely divided and contained in acrylic resins or epoxy resins, And organic low reflection materials such as fluorine-based and silicone-based organic compounds, thermoplastic resins, thermosetting resins, and radiation curable resins. Furthermore, a material in which a sol obtained by dispersing ultrafine silica particles of 5 to 30 nm in water or an organic solvent and a fluorine-based film forming agent can be used.

As a sol in which the ultrafine silica particles of 5 to 30 nm are dispersed in water or an organic solvent, a method in which alkali metal ions in an alkali silicate salt are dealkalized by ion exchange or the like, or an alkali silicate salt is neutralized with a mineral acid A known silica sol obtained by condensing active silicic acid known in the method of, etc., a known silica sol obtained by condensing alkoxysilane with hydrolysis in the presence of a basic catalyst in an organic solvent, and the above An organic solvent-based silica sol (organosilica sol) obtained by substituting water in the aqueous silica sol with an organic solvent by a distillation method or the like is used.

These silica sols can be used in both aqueous and organic solvent systems. In producing the organic solvent-based silica sol, it is not necessary to completely replace water with an organic solvent. The silica sol usually contain solids 0.5 to 50 wt% concentration as SiO _2. Various structures such as a spherical shape, a needle shape, and a plate shape can be used for the structure of the ultrafine silica particles in the silica sol. As the film forming agent, alkoxysilane, metal alkoxide, hydrolyzate of metal salt, or fluorine-modified polysiloxane can be used.

The above-mentioned low refractive index layer is prepared by diluting the above-described material in, for example, a solvent, applying it by a wet coating method using a spin coater, roll coating, printing, etc., and then drying it. For example, using a polymerization initiator) or by a vapor phase method such as vacuum deposition, sputtering, plasma CVD, or ion plating.

The high refractive index layer is achieved by using a binder resin having a high refractive index in order to increase the refractive index, adding ultrafine particles having a high refractive index to the binder resin, or using these in combination. I can do it. The refractive index of the high refractive index layer is preferably in the range of 1.55 to 2.70.

The binder resin is arbitrary as long as it is transparent, and a thermosetting resin, a thermoplastic resin, a radiation (including ultraviolet) curable resin, or the like can be used. Thermosetting resins include phenolic resin, melamine resin, polyurethane resin, urea resin, diallyl phthalate resin, guanamine resin, unsaturated polyester resin, aminoalkyd resin, melamine-urea cocondensation resin, silicon resin, polysiloxane resin, etc. A curing agent such as a crosslinking agent and a polymerization initiator, a polymerization accelerator, a solvent, a viscosity modifier and the like can be added to these resins as necessary.

Examples of the ultrafine particles having a high refractive index include, for example, ZnO (refractive index n = 1.9), TiO ₂ (n = 2.3 to 2.7), which can also obtain the effect of ultraviolet blocking. Fine particles of CeO ₂ (n = 1.95), antimony-doped SnO ₂ (n = 1.95) or ITO (n = 1.95) fine particles. Other fine particles include Al ₂ O ₃ (n = 1.63), La ₂ O ₃ (n = 1.95), ZrO ₂ (n = 2.05), Y ₂ O ₃ (n = 1.87). And the like. These ultrafine particles are used singly or in mixture, and those in the form of a colloid dispersed in an organic solvent or water are good in terms of dispersibility, and the particle size is 1 to 100 nm, the coating film is transparent From the viewpoint of properties, the thickness is preferably 5 to 20 nm.

In order to form the high refractive index layer and the low refractive index layer, the combination of the materials described above is diluted with a solvent, for example, spin coater, roll coater, printing, etc., provided on the substrate and dried, What is necessary is just to harden | cure by a heat | fever, radiation (in the case of an ultraviolet-ray, using the above-mentioned photoinitiator).

The electromagnetic wave cutting functional layer is not particularly limited as long as it has an electromagnetic wave cutting function, and examples thereof include a conductive fiber mesh, a transparent conductive film, and a conductive metal network.

The conductive fiber mesh is preferably composed of a metallized fiber fabric that is lightweight and has excellent durability and flexibility. The manufacturing method of the metalized fiber fabric itself is not important, and any metallized fiber fabric obtained by any manufacturing method can be used. Among these metallized fiber fabrics, for example, after surface resin treatment on synthetic fiber fabrics such as polyester, 15-30% by mass of electroless metal such as nickel, copper, or nickel is applied thereto. Conductive cloth or conductive mesh such as polyester, which is electrolessly plated with a conductive metal such as copper, silver or nickel, and further blackened, is durable and flexible. Excellent and suitable as a conductive member. The fiber diameter of the conductive mesh is usually 10 to 60 μm, and the mesh size is preferably in the range of 40 to 200 mesh. The mesh size is a size defined by a Tyler standard sieve.

As the transparent conductive film, for example, one or more transparent conductive layers made of metal and / or metal oxide or the like are formed by means such as vacuum deposition or sputtering, metal fine particles and / or metal oxide fine particles. For example, a resin coated with a resin in which conductive fine particles are dispersed can be used.

Examples of the metal include gold, silver, platinum, palladium, copper, titanium, chromium, molybdenum, nickel, and zirconium. Among them, silver is particularly preferable because a conductive layer having further excellent conductivity can be obtained, a near-infrared wavelength region is reflected, and a near-infrared cut function is provided. When this metal layer is provided as the conductive layer, it is preferably a multilayer film with a dielectric layer in order to prevent reflection of the metal layer. Examples of such a dielectric layer include layers made of various metal oxides, metal nitrides, metal sulfides, and the like.

Examples of the metal oxide include silicon oxide, titanium oxide, tantalum oxide, tin oxide, indium oxide, zirconium oxide, zinc oxide, and a composite oxide of indium oxide and tin oxide. Of these metals and metal oxides, one of them may be used alone, or two or more of them may be used in combination. Moreover, when forming the said electrically conductive film, it does not necessarily need to form on a transparent base material, and it forms on the surface of resin films, such as polyester, and is good also as a conductive film.

As the conductive metal network, a method of printing a lattice pattern on the surface of a transparent substrate using a conductive ink or the like, or after providing a metal thin film such as copper, silver, aluminum on the surface of the transparent substrate, Examples thereof include a method of forming a lattice pattern by means such as etching. In addition, a metal foil having a predetermined thickness obtained by plastic processing such as rolling, such as copper, silver, and aluminum is provided with a number of holes by punching or the like, and a lattice pattern is also used for the conductive metal. It can be illustrated as a net-like body. The lattice pattern preferably has a line width of 5 to 50 μm, a thickness of 1 to 100 μm, and a line portion pitch of 150 to 800 μm in view of electromagnetic shielding performance and transparency.

In the present invention, the electromagnetic wave cutting functional layer is preferably laminated and integrated so as to be inserted between the transparent substrate and the optical system film. The warpage of the front plate for a display device can be reduced by inserting and arranging at such a position. Specifically, for example, a transparent substrate, a conductive member, and an optical system film may be arranged in this order, an adhesive layer may be provided between the members, and a transparent adhesive may be used or integrated by thermocompression bonding. Moreover, although the electroconductive member in this invention should just be laminated | stacked on the at least 1 surface of a transparent base material, you may be laminated | stacked on both surfaces of the transparent base material. Furthermore, the conductive member may use a plurality of one type of conductive members, or may use a plurality of different types of conductive members. Furthermore, when using a some electroconductive member, you may use on one surface with respect to a transparent base material, and can also use it on both surfaces, and a kind and combination are not specifically limited.

In the optical filter of the present invention obtained as described above, the color correction functional layer and / or the near-infrared cut functional layer is formed by sublimating and transferring a sublimable dye in the manufacturing process, thus simplifying the manufacturing process. In addition, the manufacturing time can be shortened, and as a result, small quantities of other varieties can be produced. Further, in the product characteristics, since the base material and the transparent adhesive layer dedicated to the color correction functional layer and / or the near infrared cut functional layer can be omitted, the weight reduction is improved, and the color correction functional layer and / or the near-infrared functional layer is also improved. Infrared cut functional layer or three primary color generation functional layer is formed by transferring by sublimation of sublimable dye, so the surface is naturally formed naturally, and the smoothness of the whole optical filter is improved accordingly, and color correction The thickness unevenness of the functional layer is improved, and the color unevenness on the display surface hardly occurs. As described above, there are many advantages in the manufacturing process and product characteristics, and the industrial utilization effect is great.

Claims (2)

An optical filter comprising a color correction functional layer and / or a near infrared cut functional layer, wherein the color correction functional layer and / or the near infrared cut functional layer is formed by sublimation transfer of a sublimable dye.
An optical filter, wherein the optical filter is for a plasma display panel.