JP2012247501A - Optical filter and image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical filter having superior durability by suppressing deterioration of the dye in a dye-containing adhesive layer.SOLUTION: An optical filter 1 disposed on the front side of an image display part in an image display device includes: a dye-containing adhesive layer 3 containing at least one dye selected from a color tone correcting dye and a near-infrared absorbing dye, a light stabilizer, and an ultraviolet absorber; and an ultraviolet ray absorbing layer 7 arranged on the front side of the dye-containing adhesive layer 3.

Description

  The present invention relates to an optical filter arranged on the front side of an image display unit in an image display device, and an image display device using the same.

  Near infrared rays are radiated from the plasma display panel together with visible light. Near-infrared rays are used in near-infrared remote controls for household appliances such as home TVs, coolers, and video decks, and other communication devices, and these devices may malfunction due to near-infrared rays from plasma display panels. . For this reason, the optical filter which has a near-infrared absorption film is installed in the front side (viewing side) of a plasma display panel, and the transmittance | permeability of the near infrared rays of 850-1100 nm is made into 20% or less, for example.

  Near-infrared absorbing film is generally a resin film containing a near-infrared absorbing pigment, and is attached to a transparent substrate such as a glass plate together with a functional film such as an antireflection film or an electromagnetic wave shielding film, and an optical filter. It is composed. However, for such an optical filter, in addition to the near-infrared absorbing film, it is necessary to separately provide a pressure-sensitive adhesive layer for adhering it, which is not necessarily excellent in productivity.

  Therefore, in order to omit the near-infrared absorbing film, it has been proposed to contain a near-infrared absorbing dye in the pressure-sensitive adhesive layer. Examples of the near infrared absorbing dye include various dyes such as phthalocyanine, diimonium, polymethine, metal complex, squalium, cyanine, and indoaniline. However, such near-infrared absorbing dyes are not necessarily excellent in light resistance, and the durability of the optical filter tends to be lowered.

  In order to improve the light resistance of the optical filter, it is known that, for example, an ultraviolet absorber is contained in the pressure-sensitive adhesive layer, or a film serving as a substrate on which the pressure-sensitive adhesive layer is formed is used as an ultraviolet absorbing film. (For example, refer to Patent Document 1). However, sufficient light resistance cannot always be obtained simply by containing an ultraviolet absorber or simply providing an ultraviolet absorbing film.

  In recent years, in order to suppress a decrease in contrast due to reflection of external light on an optical filter, it has been studied to provide a contrast enhancement layer called a microlouver layer having a light-transmitting region and a dark color portion. For example, a plurality of light-transmitting regions are formed through grooves so that the light-transmitting regions extend in the horizontal direction on a transparent support such as a resin film and have a substantially trapezoidal cross-section, and the dark color portions are each transparent. These are formed so as to fill in the grooves formed between the light-sensitive regions, and are generally made of an ultraviolet curable resin from the viewpoint of productivity or the like (see, for example, Patent Document 2).

  However, when an ultraviolet curable resin is used, a photopolymerization initiator that generates radicals or the like for curing the ultraviolet curable resin is used in combination, and this remains in the cured product. For this reason, for example, radicals and the like are generated when external light, specifically, ultraviolet rays are irradiated when the optical filter is used. When the pressure-sensitive adhesive layer is disposed in contact with the contrast improving layer, the near-infrared absorbing dye in the pressure-sensitive adhesive layer deteriorates due to radicals generated in the contrast improving layer. The same problem occurs when a color tone correction dye is contained in the pressure-sensitive adhesive layer.

  It is also conceivable to change the positional relationship between the contrast improving layer and the pressure-sensitive adhesive layer so that the pressure-sensitive adhesive layer does not contact the contrast improving layer. However, since the height of the surface of the dark portion formed in the groove portion between them is usually lower than the height of the surface of the translucent region, and the surface of the contrast enhancement layer is uneven, If the pressure-sensitive adhesive layer is not placed in contact with the surface of the contrast improving layer, the visibility is likely to be lowered.

International Publication No. 2006/090705 Pamphlet JP 2006-178092 A

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an optical filter excellent in durability in which deterioration of a dye in an adhesive layer is suppressed. Another object of the present invention is to provide an image display device using such an optical filter.

  The optical filter of the present invention is disposed on the front side of an image display unit in an image display device, and is at least one dye selected from a color tone correction dye and a near-infrared absorbing dye, a light stabilizer, and an ultraviolet absorber. A dye-containing pressure-sensitive adhesive layer, and an ultraviolet-absorbing layer containing an ultraviolet absorber disposed on the front side of the dye-containing pressure-sensitive adhesive layer.

  Another optical filter of the present invention is an optical filter disposed on the front side of the image display unit in the image display device, and has a light-transmitting region and a dark color portion and at least one of the light-transmitting region and the dark color portion. Is a contrast-enhancing layer comprising a cured product of a composition containing an ultraviolet-curable resin and a photopolymerization initiator, and is disposed in contact with the contrast-enhancing layer on the front side of the contrast-enhancing layer. A dye-containing pressure-sensitive adhesive layer containing at least one dye selected from absorbing dyes, a light stabilizer, and an ultraviolet light absorber, and an ultraviolet light-absorbing layer containing an ultraviolet light absorber disposed on the front side of the dye-containing pressure-sensitive adhesive layer It is characterized by having.

  The image display device of the present invention is an image display device in which an optical filter is disposed on the front side of an image display unit, and the optical filter is the above-described optical filter of the present invention.

  According to the optical filter of the present invention, the dye-containing pressure-sensitive adhesive layer containing at least one dye selected from the color tone correction dye and the near-infrared absorbing dye contains the light stabilizer and the ultraviolet absorber, and the dye-containing pressure-sensitive adhesive. By disposing an ultraviolet absorbing layer containing an ultraviolet absorber on the front side of the layer, deterioration of the pigment in the pigment-containing pressure-sensitive adhesive layer can be effectively suppressed.

  In particular, a contrast improving layer comprising a light-transmitting region and a dark color portion, and at least one of them comprising a cured product of a composition containing an ultraviolet curable resin and a photopolymerization initiator, is provided on the front side of the contrast improving layer. In the case where the dye-containing pressure-sensitive adhesive layer is disposed in contact with the dye-containing pressure-sensitive adhesive layer, deterioration of the dye in the dye-containing pressure-sensitive adhesive layer can be effectively suppressed.

  According to the image display device of the present invention, the durability can be improved by using the optical filter in which the deterioration of the dye in the dye-containing pressure-sensitive adhesive layer is suppressed.

Sectional drawing which shows an example of the optical filter of this invention.

Hereinafter, embodiments of the present invention will be described in detail.
FIG. 1 is a cross-sectional view showing an example of the optical filter of the present invention.

  The optical filter 1 is disposed on the front side of the image display unit in the image display device, that is, on the viewer side. For example, in order from the image display unit side, the contrast improving film 2, the dye-containing pressure-sensitive adhesive layer 3, And an ultraviolet absorbing antireflection film 4.

  The contrast enhancement film 2 is provided to suppress a decrease in contrast due to external light. For example, the contrast enhancement film 2 has a contrast enhancement layer 6 on the front side of the transparent support 5. In addition, about the optical filter 1 of this invention, although it is preferable that the contrast improvement film 2 (contrast improvement layer 6) is provided, the contrast improvement film 2 (contrast improvement layer 6) does not necessarily need to be provided. .

  The contrast enhancement layer 6 includes a plurality of light-transmitting regions 6a that extend in the horizontal direction and are arranged in parallel to each other, and a dark color portion 6b that is disposed between the light-transmitting regions 6a. The dark portion 6b contains dark particles, and the cross-sectional shape thereof may be a square shape, a rectangular shape, a triangular shape, or the like in addition to a substantially trapezoidal shape. It is preferable that at least one of the translucent region 6a and the dark portion 6b is made of a cured product of a composition containing an ultraviolet curable resin and a photopolymerization initiator.

  According to such a contrast enhancement film 2 (contrast enhancement layer 6), it is possible to improve the contrast of the display image by absorbing external light by the dark color portion 6b containing dark particles, and in the translucent region 6a. Since no dark-colored particles are contained, the light transmittance is not lowered, and a reduction in visibility due to a darkened display image can be suppressed.

  The ultraviolet absorbing antireflection film 4 has an ultraviolet absorbing function and an antireflection function. In the optical filter 1 of the present invention, the ultraviolet absorbing antireflection film 4 is provided particularly for suppressing deterioration of the dye in the dye-containing pressure-sensitive adhesive layer 3. The ultraviolet absorbing antireflection film 4 has, for example, an antireflection layer 8 on the front side of the ultraviolet absorbing film 7. Here, the ultraviolet absorbing film 7 corresponds to the ultraviolet absorbing layer containing the ultraviolet absorbent in the present invention.

  About the optical filter 1 of this invention, although an ultraviolet absorption layer needs to be arrange | positioned at least on the front side of the pigment | dye containing adhesive layer 3, the pigment | dye containing adhesive layer 3 and an ultraviolet absorption layer need to be necessarily in contact. There is no. In the optical filter 1 of the present invention, the antireflection layer 8 is preferably provided, but the antireflection layer 8 is not necessarily provided.

  The contrast improving film 2 and the ultraviolet absorbing antireflection film 4 are bonded together by the dye-containing pressure-sensitive adhesive layer 3. The dye-containing pressure-sensitive adhesive layer 3 contains at least one dye selected from a color tone correction dye and a near-infrared absorbing dye, and also contains a light stabilizer and an ultraviolet absorber.

  According to the optical filter 1 of the present invention, the dye-containing pressure-sensitive adhesive layer 3 containing at least one dye selected from a color tone correction dye and a near-infrared-absorbing dye contains the light stabilizer and the ultraviolet absorber, and the dye-containing pressure-sensitive adhesive. By disposing the ultraviolet absorbing layer on the front side of the agent layer 3, deterioration of the pigment contained in the pigment-containing pressure-sensitive adhesive layer 3 can be suppressed. In particular, since the contrast improving layer 6 including at least a part of a cured product of a composition containing an ultraviolet curable resin and a photopolymerization initiator is included, and the dye-containing pressure-sensitive adhesive layer 3 is in contact with the contrast improving layer 6 In the pigment-containing pressure-sensitive adhesive layer 3 that easily deteriorates, the deterioration of the pigment can be effectively suppressed.

  The transparent support 5 in the contrast enhancement film 2 is not particularly limited as long as it has transparency, and examples thereof include a film or plate made of glass, a resin material, or the like. For example, as resin materials, polyesters such as polyethylene terephthalate (PET) and polybutylene terephthalate (PBT), polyolefins such as polyethylene and polypropylene, polyacrylates such as polymethyl methacrylate (PMMA), polycarbonate (PC), polystyrene, triacetate, polyvinyl Examples include alcohol, polyvinyl chloride, polyvinylidene chloride, ethylene-vinyl acetate copolymer, polyvinyl butyral, polyurethane, and cellophane. 10-200 micrometers is preferable and, as for the thickness of the transparent support body 5, 50-150 micrometers is more preferable.

  The constituent material of the translucent region 6a in the contrast enhancement layer 6 is preferably a resin material because it is easy to form a groove for forming the dark color portion 6b, can be light and thin, and is excellent in flexibility. For example, resin materials such as a cured product of an ionizing radiation curable resin, a cured product of a thermosetting resin, and a thermoplastic resin can be used. In the optical filter 1 of the present invention, at least one of the translucent region 6a and the dark color portion 6b is made of an ultraviolet curable resin, particularly a prepolymer or monomer having a radical polymerizable functional group, and photopolymerization is started. It is preferable to use an agent, particularly one that generates radicals.

  The ionizing radiation curable resin means a resin that is cured by crosslinking or polymerization reaction by irradiation with electromagnetic waves or charged particle beams such as ultraviolet rays or electron beams. Examples of such ionizing radiation curable resins include ionizing radiation polymerizable prepolymers and / or ionizing radiation polymerizable monomers.

  Examples of ionizing radiation polymerizable prepolymers (including oligomers) include polyester (meth) acrylates, epoxy (meth) acrylates, urethane (meth) acrylates, polyol (meth) acrylates, silicon (meth) acrylates, Polymerization prepolymer having a radical polymerizable functional group in the molecule such as unsaturated polyester, or cationic polymerization in the molecule such as epoxy resin such as novolac epoxy resin prepolymer and aromatic vinyl ether resin prepolymer Examples thereof include a polymerizable prepolymer having a functional group. These ionizing radiation polymerizable prepolymers may be used alone or in combination of two or more. Here, “(meth) acrylate” means “acrylate or methacrylate”.

  The ionizing radiation polymerizable monomer (monomer) is preferably a polyfunctional (meth) acrylate which is a polymerizable monomer having a radical polymerizable functional group in the molecule, specifically ethylene glycol di (meth). Acrylate, propylene glycol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate, caprolactone modified dipentaerythritol hexa (meth) acrylate, etc. It is done. Examples of the monomer having a cationic polymerizable functional group include alicyclic epoxides such as 3,4-epoxycyclohexenylmethyl-3 ′, 4′-epoxycyclohexenecarboxylate, and glycidyl ethers such as bisphenol A diglycidyl ether. , Vinyl ethers such as 4-hydroxybutyl vinyl ether, oxetanes such as 3-ethyl-3-hydroxymethyloxetane, and the like. These ionizing radiation polymerizable monomers may be used alone or in combination of two or more, or may be used in combination with an ionizing radiation polymerizable prepolymer.

  When an ultraviolet curable resin is used as the ionizing radiation curable resin, it is preferable to add about 0.1 to 5 parts by mass of the photopolymerization initiator with respect to 100 parts by mass of the ionizing radiation curable resin. The photopolymerization initiator can be appropriately selected from those conventionally used.

  Examples of the polymerizable monomer or polymerizable prepolymer having a radical polymerizable functional group in the molecule include benzoin, benzoin methyl ether, acetophenone, dimethylaminoacetophenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, Examples thereof include 1-hydroxycyclohexyl phenyl ketone, benzophenone, p-phenylbenzophenone, 2-methylanthraquinone, 2-ethylanthraquinone, 2-methylthioxanthone, 2-ethylthioxanthone, benzyl dimethyl ketal, acetophenone dimethyl ketal. Examples of the polymerizable monomer or polymerizable prepolymer having a cationic polymerizable functional group in the molecule include aromatic sulfonium salts, aromatic diazonium salts, aromatic iodonium salts, metallocene compounds, and benzoin sulfonic acid esters. Examples of the photosensitizer include p-dimethylbenzoate, tertiary amines, and thiol sensitizers.

  Thermosetting resins include phenolic resin, phenol-formalin resin, urea resin, urea-formalin resin, melamine resin, polyester-melamine resin, melamine-formalin resin, alkyd resin, epoxy resin, epoxy-melamine resin, unsaturated polyester. Examples thereof include resins, polyimide resins, acrylic resins, polysiloxane resins, polyurethane resins, and general-purpose two-component curable acrylic resins (acrylic polyol cured products).

  Examples of the thermoplastic resin include polyethylene terephthalate (PET), polyethylene naphthalate (PEN), ethylene glycol-terephthalic acid-isophthalic acid copolymer, terephthalic acid-ethylene glycol-1,4 cyclohexanedimethanol copolymer, polyester heat Polyester resins such as plastic elastomers, polyolefin resins such as polyethylene, polypropylene, cyclic polyolefin, and polymethylpentene, halogen-containing resins such as polyvinyl chloride and polyvinylidene chloride, styrene resins such as polystyrene and acrylonitrile-styrene copolymers, Examples include cellulose resins such as acetyl cellulose, diacetyl cellulose, and acetate butyrate cellulose, thermoplastic polyurethane resins, polycarbonate resins, and polyamide resins. It is.

  The dark color portion 6b in the contrast enhancement layer 6 is preferably one in which dark particles are dispersed in a binder resin, which absorbs most of the visible light wavelength region and absorbs incident visible light (external light) at a high rate. Those are preferred. According to such a configuration, even if the reflected external light is not conspicuous and the reflected light is mixed into the image light, a decrease in image contrast is suppressed.

  As the dark particles, particles of each color can be used. For example, as black particles, black pigments such as carbon black (black) and black iron oxide, and transparent particles such as acrylic are dyed with a black pigment such as carbon black. Examples thereof include resin particles. The dark particles may be pigment particles that are achromatic by mixing various pigments such as blue, purple, yellow, and red, or may be resin particles that are dyed with these pigments. Copper pigments such as copper phthalocyanine blue, indanthrene blue, cobalt blue, ultramarine blue, purple pigments such as dioxazine violet, yellow pigments such as disazo yellow, isoindolinone yellow, and yellow lead, red pigments such as chromophthal red Examples of green pigments such as tiepel, quinacridone red, and petals include copper phthalocyanine green and patina. The content of the dark particles is preferably 10 to 100 parts by mass with respect to 100 parts by mass of the binder resin.

  Examples of the binder resin include those similar to the resin material of the translucent region 6a, and examples thereof include a resin material such as a cured product of an ionizing radiation curable resin, a cured product of a thermosetting resin, and a thermoplastic resin. . As already described, in the optical filter 1 of the present invention, at least one resin material of the translucent region 6a and the dark color portion 6b is made of an ultraviolet curable resin, particularly a prepolymer having a radical polymerizable functional group. It is preferable to use a monomer in combination with a photopolymerization initiator, particularly one that generates radicals.

  The contrast enhancement film 2 can be manufactured as follows, for example. First, a translucent region forming composition is applied on the transparent support 5, and grooves or the like for forming the dark color portion 6b are formed on the surface thereof to form the translucent region 6a. For example, in the case of the translucent region 6a made of an ultraviolet curable resin, a composition for forming a translucent region is prepared by dissolving an ultraviolet curable resin and a photopolymerization initiator in an organic solvent, and then transparently supporting the composition. It is applied to the surface of the body 5 and is formed by being cured by irradiating with ultraviolet rays while forming a groove portion for forming a dark color portion 6b by pressing a roll-shaped mold (shaped forming roll) on the surface. To do.

  The dark color part 6b can be formed by dissolving the dark color particles and the binder resin in an organic solvent to prepare a dark color part forming composition, and then applying this to the groove part between the translucent regions 6a and curing it. For example, when an ultraviolet curable resin is used as the binder resin, a dark color part forming composition is prepared by dissolving dark particles, an ultraviolet curable resin, and a photopolymerization initiator in an organic solvent, and this is used as a light transmissive region 6a. After being applied to the grooves in between, it is cured by irradiating with ultraviolet rays.

  The thickness of the translucent region 6a is preferably 20 to 200 μm, more preferably 30 to 150 μm, for example, from the viewpoint of forming the dark color portion 6b, and the thickness (depth) of the dark color portion 6b is 10 to 180 μm. Preferably, 20 to 130 μm is more preferable, the width is preferably 5 to 100 μm, more preferably 5 to 50 μm, and the pitch is preferably 10 to 200 μm, and more preferably 20 to 150 μm.

  The dye-containing pressure-sensitive adhesive layer 3 contains at least one dye selected from a color tone correction dye and a near-infrared absorbing dye, a light stabilizer, and an ultraviolet absorber. The dye, the light stabilizer, and the ultraviolet absorber are contained in a state dispersed in the pressure-sensitive adhesive.

  Examples of the pressure-sensitive adhesive include acrylic pressure-sensitive adhesives, silicone-based pressure-sensitive adhesives, butadiene-based pressure-sensitive adhesives, and urethane-based pressure-sensitive adhesives, and acrylic pressure-sensitive adhesives are particularly preferable.

  The acrylic pressure-sensitive adhesive is a polymer containing an acrylic monomer unit as a main component. Examples of the acrylic monomer include (meth) acrylic acid, itaconic acid, (anhydrous) maleic acid, (anhydrous) fumaric acid, crotonic acid, and alkyl esters thereof. Here, “(meth) acrylic acid” means acrylic acid and methacrylic acid.

  Among the acrylic monomers, those having (meth) acrylic acid or an alkyl ester thereof as a main component are preferable. Here, the main component means that (meth) acrylic acid or an alkyl ester thereof is contained in an amount of 95% by mass or more based on the total amount of the acrylic pressure-sensitive adhesive. More preferably, it is 98 mass% or more, More preferably, it is 99 mass% or more. Examples of alkyl esters of (meth) acrylic acid include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, n-butyl (meth) acrylate, n-pentyl (meth) acrylate, and n-hexyl (meta ) Acrylate, n-heptyl (meth) acrylate, n-octyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, isononyl (meth) acrylate, n-decyl (meth) acrylate, isodecyl (meth) acrylate, and the like. .

  In order to increase the cohesive strength of the pressure-sensitive adhesive, it is preferable to use a monomer having a functional group (for example, a hydroxy group, a glycidyl group, etc.) that can become a crosslinking point. Examples of the monomer having a functional group that can be a crosslinking point include hydroxyethyl acrylate, hydroxyethyl methacrylate, glycidyl acrylate, glycidyl methacrylate, and the like.

  When using a monomer having such a crosslinking point, it is preferable to add a crosslinking agent. The cohesive force can be ensured by reacting a crosslinking agent with a crosslinking point to crosslink the polymer. Examples of cross-linking agents include melamine resins, urea resins, epoxy resins, metal oxides, metal salts, metal hydroxides, metal chelates, polyisocyanates, carboxy group-containing polymers, acid anhydrides, polyamines, and so on. It is suitably selected according to the type of functional group that can be obtained.

  The acrylic pressure-sensitive adhesive preferably has an acid value of 7 mgKOH / g or less. The acid value may be 0 mgKOH / g. A preferable acid value is 0-4 mgKOH / g. When the acid value of the acrylic pressure-sensitive adhesive is 7 mgKOH / g or less, discoloration after the moisture resistance test can be suppressed. The acid value here is a value obtained by titration of alcoholic potassium hydroxide (KOH) using phenolphthalein as an indicator.

  In order to set the acid value of the acrylic pressure-sensitive adhesive to 7 mgKOH / g or less, the copolymerization amount of acrylic acid may be adjusted so that the acid value falls within the above range when the acrylic monomer is polymerized. An acrylic pressure-sensitive adhesive having an acid value of 7 mgKOH / g or less is commercially available, and can be appropriately selected and used. For example, product name: “NCK101” manufactured by Toyo Ink Co., Ltd. (acid value = 0 mgKOH / g), product name: “EXK04-488” manufactured by Toyo Ink Co., Ltd. (acid value: 6.2 mgKOH / g), and the like.

  Moreover, it is preferable that the glass transition temperature (Tg) of an acrylic adhesive is -40-40 degreeC, More preferably, it is -30-10 degreeC.

  The color tone correction dye absorbs a part of a specific wavelength range of visible light and improves the color tone of transmitted visible light. Examples of color correction dyes include azo, condensed azo, diimonium, phthalocyanine, anthraquinone, indigo, perinone, perylene, dioxazine, quinacridone, methine, isoindolinone, and quinophthalone. Well-known organic pigments such as pyrrole, thioindigo, porphyrin, and tetraazaporphyrin, organic dyes, and inorganic pigments.

  Among the color correction dyes, a dye having good light resistance and good compatibility or dispersibility with an adhesive, for example, one selected from anthraquinone dyes, quinophthalone dyes, and tetraazaporphyrin dyes, Or it is preferable to use combining 2 or more types suitably. It is more preferable to use one or two or more selected from anthraquinone dyes and tetraazaporphyrin dyes in appropriate combination.

"Anthraquinone dye"
Preferred examples of the anthraquinone dye include compounds represented by the following general formulas (1) and (2).

In the formula, R ^{1 to} R ⁸ are each independently a hydrogen atom, a chlorine atom, a fluorine atom, a bromine atom, a cyano group, a benzyl group, a hydroxyl group, an alkyl group having 1 to 12 carbon atoms, or one or more hydrogen atoms being a fluorine atom. An alkyl group having 1 to 12 carbon atoms substituted with a bromine atom or a chlorine atom, a phenyl group, a phenyl group in which one or more hydrogen atoms are substituted with a fluorine atom, a bromine atom or a chlorine atom, 1 to 12 carbon atoms An alkoxyl group having 1 to 12 carbon atoms in which one or more hydrogen atoms are substituted with a fluorine atom, a bromine atom or a chlorine atom, —CO—R ^h (where R ^h is an alkyl having 1 to 8 carbon atoms) group, a phenyl group, a benzyl group, a cyclohexyl group, cyclohexylmethyl group, or a 1-naphthyl group or a 2-naphthyl ^{group), -. S-R i} ( however, ^{R i} is carbon 1-8 alkyl group, phenyl group, benzyl group, cyclohexyl group, cyclohexylmethyl group, 1-naphthyl group or 2-naphthyl group) or -NH-Ph (where Ph is a phenyl group or Or a phenyl group in which one or more hydrogen atoms are substituted with any of an alkyl group having 1 to 10 carbon atoms and an alkoxyl group having 1 to 10 carbon atoms.

Among the compounds represented by the formula (1), R ⁸ is —NH—Ph (where Ph is a phenyl group or an alkyl group having 1 to 10 carbon atoms and an alkyl group having 1 to 10 carbon atoms and 1 to 10 carbon atoms). It is preferably a phenyl group substituted with any alkoxyl group. R ¹ , R ⁴ , R ⁵ , and R ⁶ are a phenyl group in which one of the four groups is a hydroxyl group, a phenyl group, and one or more hydrogen atoms are substituted with a fluorine atom, a bromine atom, or a chlorine atom. It is preferable that the remaining three groups are hydrogen atoms. R ² , R ³ and R ⁷ are preferably hydrogen atoms. It is preferable that the substituent is a compound as described above since the solubility in a solvent is excellent.

In the formula, R ^{9 to} R ²² are each independently a hydrogen atom, a chlorine atom, a fluorine atom, a bromine atom, a cyano group, a benzyl group, an alkyl group having 1 to 12 carbon atoms, one or more hydrogen atoms are a fluorine atom, bromine An alkyl group having 1 to 12 carbon atoms substituted by an atom or a chlorine atom, a phenyl group, a phenyl group having one or more hydrogen atoms substituted by a fluorine atom, a bromine atom or a chlorine atom, an alkoxyl having 1 to 12 carbon atoms group, one or more hydrogen atoms fluorine atom, an alkoxyl group substituted with a bromine atom or a chlorine atom, -CO-R j ^(provided that, R ^j represents an alkyl group having 1 to 8 carbon atoms, a phenyl group, a benzyl group, cyclohexyl, cyclohexylmethyl group, or a 1-naphthyl group or a 2-naphthyl ^{group), -. S-R k} ( however, ^{R k} is an alkyl group having 1 to 8 carbon atoms, An phenyl group, a benzyl group, a cyclohexyl group, a cyclohexylmethyl group, a 1-naphthyl group or a 2-naphthyl group) or -NH-Ph (where Ph is a phenyl group or one or more hydrogen atoms) A phenyl group substituted with any one of an alkyl group having 1 to 10 carbon atoms and an alkoxyl group having 1 to 10 carbon atoms.

  As the anthraquinone dye, the compound represented by the formula (1) is preferable from the viewpoint of solubility in a solvent. Examples of anthraquinone dyes represented by the formula (1) include, for example, trade names “Kayaset Violet AR”, “Kayaset Blue N”, “Kayaset Blue FR”, and “Kayaset Green AB” manufactured by Nippon Kayaku Co., Ltd. Or the like.

"Tetraazaporphyrin dyes"
Further, the tetraazaporphyrin-based dye preferably has a structure represented by the formula (3).

In the formula, each of R ^{23 to} R ³⁰ is independently a hydrogen atom, a chlorine atom, a fluorine atom, a bromine atom, a cyano group, a benzyl group, or one or more hydrogen atoms are substituted with a fluorine atom, a bromine atom or a chlorine atom. Benzyl group, phenyl group, phenyl group in which one or more hydrogen atoms are substituted with fluorine atom, bromine atom or chlorine atom, alkyl group having 1 to 10 carbon atoms, one or more hydrogen atoms in fluorine atom, bromine atom or chlorine An alkyl group having 1 to 10 carbon atoms, an alkoxyl group having 1 to 10 carbon atoms, or an alkoxyl group having 1 to 10 carbon atoms in which one or more hydrogen atoms are substituted with fluorine, bromine or chlorine atoms One of the groups.
M ¹ is any ^one of Cu, Ni, Zn, Pd, Pt, VO, Co, and Mg.
R ^{23 to} R ³⁰ are preferably an alkyl group having 1 to 6 carbon atoms from the viewpoint of solubility in a solvent. M ¹ is preferably Cu or VO.

  Examples of the tetraazaporphyrin-based dye represented by the formula (3) include trade names “TAP-2”, “TAP-18”, and “TAP-45” manufactured by Yamada Chemical Co., Ltd.

  The tetraazaporphyrin-based dye can be preferably used because it can efficiently absorb the unnecessary orange light having a wavelength of about 590 nm emitted from the plasma display panel. From the viewpoint of durability, anthraquinone dyes are preferable. More preferably, a tetraazaporphyrin dye and an anthraquinone dye are used in combination.

  0.001-20 mass parts is preferable with respect to 100 mass parts of adhesives, and, as for content of a color correction pigment | dye, 0.01-10 mass parts is more preferable. By setting the content of the color tone correction pigment to 0.001 part by mass or more, the color tone correction function can be sufficiently exhibited, and by setting the content to 20 parts by mass or less, a decrease in durability can be suppressed.

  As near-infrared absorbing dyes, polymethine dyes, phthalocyanine dyes, naphthalocyanine dyes, aminium dyes, imonium dyes, diimonium dyes, anthraquinone dyes, naphthoquinone dyes, indolephenol dyes, azo dyes, Examples include triallylmethane dyes and tungsten oxide dyes. Near infrared absorption dyes having a maximum absorption wavelength of 750 to 1100 nm are preferred for applications such as heat ray absorption and noise prevention of electronic equipment, and aminium dyes, phthalocyanine dyes, naphthalocyanine dyes, diimonium dyes, tungsten oxide dyes. Is particularly preferred.

  The near-infrared absorbing dye may be one kind or a mixture of two or more kinds. From the viewpoint of durability of the near-infrared absorbing dye, it is preferable to use only one kind or a combination of two or more phthalocyanine dyes. In addition to durability, it is more preferable to use a combination of two or more phthalocyanine dyes because they can absorb near infrared rays sufficiently and efficiently. A diimonium dye is also preferable because it can efficiently absorb near infrared rays.

"Diimonium dyes"
The diimonium dye is a compound represented by the following general formula (4).

In the formula, R ^{31 to} R ³⁸ are each independently a hydrogen atom, an alkyl group, an alkyl group having a substituent, an alkenyl group, an alkenyl group having a substituent, an aryl group, an aryl group having a substituent, an alkynyl group or a substituent. Represents an alkynyl group having a group, and Z < ^- > represents an anion.

In R ^{31 to} R ³⁸ , the alkyl group includes a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, a secondary butyl group, an isobutyl group, a tertiary butyl group, an n-pentyl group, a primary group. Examples thereof include a tripentyl group, an n-hexyl group, an n-octyl group, and a tertiary octyl group. The alkyl group may have a substituent such as an alkoxycarbonyl group, a hydroxyl group, a sulfo group, or a carboxyl group.

  Examples of the alkenyl group include a vinyl group, a propenyl group, a butenyl group, a pentenyl group, a hexenyl group, a heptenyl group, and an octenyl group. The alkenyl group may have a substituent such as a hydroxyl group or a carboxy group.

  As the aryl group, benzyl group, p-chlorobenzyl group, p-methylbenzyl group, 2-phenylmethyl group, 2-phenylpropyl group, 3-phenylpropyl group, α-naphthylmethyl group, or β-naphthylethyl group Etc. The aryl group may have a substituent such as a hydroxyl group or a carboxy group.

  Examples of the alkynyl group include propynyl group, butynyl group, 2-chlorobutynyl group, pentynyl group, and hexynyl group. The alkynyl group may have a substituent such as a hydroxyl group or a carboxy group.

R ^{31 to} R ³⁸ are preferably an n-butyl group or an isobutyl group. The n-butyl group or isobutyl group is preferable because it has excellent durability against moisture. An isobutyl group is particularly preferable.

Z ⁻ represents chlorine ion, bromine ion, iodine ion, perchlorate ion, periodate ion, nitrate ion, benzenesulfonate ion, P-toluenesulfonate ion, methyl sulfate ion, ethyl sulfate ion, propyl sulfate ion, Tetrafluoroborate, tetraphenylborate, hexafluorate, benzenesulfinate, acetate, trifluoroacetate, propionate, benzoate, oxalate, succinate, malonate Oleate ion, stearate ion, citrate ion, monohydrogen diphosphate ion, dihydrogen monophosphate ion, pentachlorostannate ion, chlorosulfonate ion, fluorosulfonate ion, trifluoromethanesulfonate ion, hexa Fluoroarsenic acid On, hexafluoroantimonate ion, molybdate ion, tungstate ion, titanate ion, zirconate _{^{ion, (R f SO 2) 2}} N - or _{^{(R f SO 2) 3 C}} - [R f is C 1 -C Represents an anion of ˜4].

Among these anions, perchlorate ion, iodine ion, tetrafluoroborate ion, hexafluorophosphate ion, hexafluoroantimonate ion, trifluoromethanesulfonate ion, (R ^f SO ₂ ) ₂ N ⁻ , ( R ^f SO _{2) 3} C ^- and the like are preferable, especially _{^{(R f SO 2) 2 N}} -, (R f SO 2) 3 C - preferably for the most excellent in thermal stability.

“Phthalocyanine dyes”
The phthalocyanine dye is not particularly limited as long as it is a compound having a phthalocyanine skeleton (see the following chemical formula (5)). M ² in the formula (5) is any one of Cu, Ni, Zn, Pd, Pt, VO, Co, and Mg, and Cu or VO is preferable. Among the phthalocyanine-based dyes, a near-infrared absorbing dye having a maximum absorption wavelength at 800 to 1100 nm is preferable because the near-infrared absorptivity of the pressure-sensitive adhesive composition is increased. Examples of the phthalocyanine dye having a maximum absorption wavelength at 800 to 1100 nm include, for example, trade name “EEX COLOR IR-12”, trade name “EEX COLOR IR-14”, and trade name “TX-EX” manufactured by Nippon Shokubai Co., Ltd. -906B ", trade name" TX-EX-910B ") and the like.

"Tungsten oxide dyes"
Tungsten oxide _pigments, W r _{O s} (provided that 2.2 ≦ s / r ≦ 2.999. ) Tungsten oxide microparticles represented by or _A t _W u _{O v,} (except, A is H, He, alkali metal, alkaline earth metal, rare earth element, Mg, Zr, Cr, Mn, Fe, Ru, Co, Rh, Ir, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, Al, Ga In, Tl, Si, Ge, Sn, Pb, Sb, B, F, P, S, Se, Br, Te, Ti, Nb, V, Mo, Ta, Re, Be, Hf, Os, Bi, I Among these, composite tungsten oxide fine particles represented by an element selected from the following: 0.001 ≦ t / u ≦ 1.1, 2.2 ≦ v / u ≦ 3.0) are preferable.

  0.001-20 mass parts is preferable with respect to 100 mass parts of adhesives, and, as for content of a near-infrared absorption pigment | dye, 0.01-10 mass parts is more preferable. By setting the content of the near-infrared absorbing pigment to 0.001 part by mass or more, the near-infrared absorbing function can be sufficiently exerted, and by setting the content to 20 parts by mass or less, a decrease in durability can be suppressed.

  A known light stabilizer can be used as the light stabilizer, and a dithiol complex-based light stabilizer is particularly preferably used.

"Dithiol complex"
A dithiol complex is a compound in which dithiol is coordinated to a metal atom via a sulfur atom constituting a thiol group. For example, a compound represented by the formula (6) is preferable.

In the formula, R ^{39 to} R ⁵⁸ are each independently a hydrogen atom, a halogen atom, an amino group, a nitro group, a cyano group, an alkyl group having 1 to 20 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, or an alkyl group having 1 to 20 carbon atoms. An aryl group, an aralkyl group having 1 to 20 carbon atoms, or an alkylamino group having 1 to 20 carbon atoms, and M ³ represents copper, nickel, platinum, or palladium.

  Specifically as a dithiol complex, as a commercial item, the product name "EST-3" (dithiol copper complex, bis (4-piperidylsulfonyl-1,2-benzenedithiolate-S, S ') manufactured by Sumitomo Seika Co., Ltd. Copper-tetra-n-butylammonium), trade name “EST-5” (dithiol copper complex, bis (4-morpholinosulfonyl-1,2-dithiophenolate) copper-tetra-n-butylammonium), trade name “ EST-5Ni "(dithiol nickel complex, bis (4-morpholinosulfonyl-1,2-dithiophenolate) nickel-tetra-n-butylammonium), manufactured by Wako Pure Chemical Industries, Ltd., trade name" bis (dibutyldithiocarbamic acid) Nickel (II) "and the like. Among the dithiol complexes, a dithiol copper complex and a dithiol nickel complex are preferable because durability becomes higher.

  The dithiol complex is preferable because it is excellent in its own stability and excellent in the quencher effect on the dye, particularly the phthalocyanine dye, that is, the effect of improving the light stability of the phthalocyanine dye.

  0.001-20 mass parts is preferable with respect to 100 mass parts of adhesives, as for content of the dithiol complex as an optical stabilizer, 0.01-10 mass parts is more preferable, and 0.05-5 mass parts is further. preferable. By setting the content of the dithiol complex as the light stabilizer to 0.001 part by mass or more, the stabilization function can be sufficiently exerted, and by setting the content to 20 parts by mass or less, a decrease in durability can be suppressed, and the optical filter It is possible to secure other physical properties required for

  As UV absorbers, benzotriazole UV absorbers, benzophenone UV absorbers, salicylate UV absorbers, cyanoacrylate UV absorbers, triazine UV absorbers, oxanilide UV absorbers, nickel complex UV absorbers Inorganic UV absorbers are preferred.

  As the ultraviolet absorber, for example, a triazine compound represented by the formula (7) is preferable. By using the triazine compound represented by Formula (7), deterioration of the pigment in the pigment-containing pressure-sensitive adhesive layer 3 can be suppressed, and durability can be improved.

In the formula, R ⁵⁹ is a hydrogen atom, a chlorine atom, a fluorine atom, a bromine atom, a cyano group, a benzyl group, an alkyl group having 1 to 12 carbon atoms, and one or more hydrogen atoms are substituted with a fluorine atom, a bromine atom or a chlorine atom. An alkyl group having 1 to 12 carbon atoms, a phenyl group, a phenyl group in which one or more hydrogen atoms are substituted with a fluorine atom, a bromine atom or a chlorine atom, an alkoxyl group having 1 to 12 carbon atoms, and one or more hydrogen atoms being fluorine. atom, a bromine atom or alkoxylated groups having 1 to 12 carbon atoms substituted by a chlorine atom, ^{-CO-R a} (However, ^{R a} is an alkyl group having 1 to 8 carbon atoms, a phenyl group, a benzyl group, a cyclohexyl group, cyclohexyl methyl group, or a 1-naphthyl group or a 2-naphthyl ^{group), -. O-CH (} R b) -CO-O-R c ( provided that ^{R b} is 1 to 12 carbon atoms Al Alkyl group), a C1-20 group, is ^{R c} - ^{S-R d} (provided that, ^{R d} represents an alkyl group having 1 to 8 carbon atoms, a phenyl group, a benzyl group, a cyclohexyl group, cyclohexylmethyl group, 1 -It is either a naphthyl group or a 2-naphthyl group.) Or -NH-Ph (where Ph is a phenyl group or an alkyl group having 1 to 10 carbon atoms and a carbon number of 1 or more hydrogen atoms in the group) Any one of 1 to 10 alkoxyl groups). R ^{60 to} R ⁷⁰ are each independently a hydrogen atom, a chlorine atom, a fluorine atom, a bromine atom, a cyano group, a benzyl group, an alkyl group having 1 to 12 carbon atoms, or one or more hydrogen atoms are a fluorine atom, a bromine atom or chlorine. An alkyl group having 1 to 12 carbon atoms substituted by an atom, a phenyl group, a phenyl group having one or more hydrogen atoms substituted by a fluorine atom, a bromine atom or a chlorine atom, an alkoxyl group having 1 to 12 carbon atoms, 1 An alkoxyl group in which the hydrogen atom is substituted by a fluorine atom, a bromine atom or a chlorine atom, —CO—R ^e (where R ^e is an alkyl group having 1 to 8 carbon atoms, a phenyl group, a benzyl group, a cyclohexyl group, cyclohexylmethyl group, or a 1-naphthyl group or a 2-naphthyl ^{group), -. S-R g} ( provided that, ^{R g} is an alkyl group having 1 to 8 carbon atoms, Fe Group, benzyl group, cyclohexyl group, cyclohexylmethyl group, 1-naphthyl group or 2-naphthyl group) or -NH-Ph (where Ph is a phenyl group or one or more hydrogen atoms) A phenyl group substituted with any one of an alkyl group having 1 to 10 carbon atoms and an alkoxyl group having 1 to 10 carbon atoms. a and b are each independently an integer of 0 to 3;

a and b are each independently preferably 1 or 2, and most preferably a = 1 and b = 1. R ⁵⁹ is an alkyl group having 4 to 10 carbon atoms, an alkyl group having 4 to 10 carbon atoms in which one or more hydrogen atoms are substituted with a fluorine atom or a chlorine atom, an alkoxyl group having 4 to 10 carbon atoms, and one or more hydrogen atoms. An alkoxyl group having 4 to 10 carbon atoms in which an atom is substituted with a fluorine atom or a chlorine atom, —CO—R ^a (wherein R ^a is an alkyl group having 4 to 8 carbon atoms), —O—CH (R ^b ) —CO—O—R ^c (wherein R ^b is an alkyl group having 4 to 10 carbon atoms and R ^c is an alkyl group having 4 to 10 carbon atoms), the solubility in an organic solvent This is preferable. In particular, R ⁵⁹ is preferably —O—CH (R ^b ) —CO—O—R ^c , R ^b has preferably 1 to 6 carbon atoms, and R ^c has more preferably 6 to 18 carbon atoms. It is preferable that R ⁵⁹ is a group of the above formula because the solubility of the triazine compound in an organic solvent becomes good. Also, by the number of carbon atoms of R ^c is within the range, preferably the solubility in an organic solvent is further improved.

R ^{60 to} R ⁷⁰ are each independently a hydrogen atom, a chlorine atom, a fluorine atom, a cyano group, an alkyl group having 1 to 4 carbon atoms, or 1 or more hydrogen atoms substituted by fluorine atoms or chlorine atoms. An alkyl group having 1 to 4 carbon atoms, an alkoxyl group having 1 to 12 carbon atoms, an alkoxyl group in which one or more hydrogen atoms are substituted with fluorine atoms or chlorine atoms, -CO-R ^e (where R ^e is 1 to 4 carbon atoms) In view of solubility in an organic solvent. It is more preferable that R ^{60 to} R ⁷⁰ are each independently a hydrogen atom or an alkyl group having 1 to 4 carbon atoms because the solubility in an organic solvent is improved.

  0.1-30 mass parts is preferable with respect to 100 mass parts of adhesives, and, as for content of a ultraviolet absorber, 0.5-20 mass parts is more preferable. By setting the content of the ultraviolet absorber to 0.1 parts by mass or more, the ultraviolet absorbing function can be sufficiently exhibited, and by setting the content to 30 parts by mass or less, other physical properties required for the optical filter 1 can be ensured.

  The dye-containing pressure-sensitive adhesive layer 3 is prepared by dissolving a pressure-sensitive adhesive, a color tone correction dye, a near-infrared absorbing dye, a light stabilizer, and an ultraviolet absorber in an organic solvent to prepare a dye-containing pressure-sensitive adhesive composition. It can be formed by applying to functional film and drying. In addition, you may make a pigment | dye containing adhesive composition contain a leveling agent, an antistatic agent, a heat stabilizer, antioxidant, a dispersing agent, a flame retardant, a lubricant, a plasticizer, etc. as needed.

  Organic solvents include aromatics such as toluene and xylene, amides such as N-methyl-2-pyrrolidone, dimethylformamide, and dimethylacetamide, ketones such as methyl ethyl ketone, methyl isobutyl ketone, and acetone, methanol, ethanol, i- Examples thereof include alcohols such as propyl alcohol, hydrocarbons such as hexane, and tetrahydrofuran. These organic solvents may be used alone, or may be appropriately mixed and used as necessary.

  Examples of the coating method include dip coating, spray coating, spinner coating, bead coating, wire bar coating, blade coating, roller coating, curtain coating, slit die coater, gravure coater, Coating methods such as slit reverse coater method, micro gravure method and comma coater method can be adopted.

  The thickness of the dye-containing pressure-sensitive adhesive layer 3 is preferably 0.3 to 100 μm, and more preferably 0.5 to 50 μm. When the thickness is 0.3 μm or more, the near-infrared absorbing ability and the like can be sufficiently exhibited, and when the thickness is 100 μm or less, the residual organic solvent during molding can be reduced.

  The ultraviolet absorbing antireflection film 4 has an antireflection layer 8 on the front side of the ultraviolet absorbing film 7. About the optical filter 1 of this invention, the light stabilizer is arrange | positioned at the pigment | dye containing adhesive layer 3 by arrange | positioning the ultraviolet absorption film 7, ie, the ultraviolet absorber layer containing an ultraviolet absorber, in the front side of the pigment | dye containing adhesive layer 3. In addition, the deterioration of the pigment in the pigment-containing pressure-sensitive adhesive layer 3 can be effectively suppressed in combination with the inclusion of the ultraviolet absorber.

  The ultraviolet absorbing film 7 is not particularly limited as long as it is a film containing an ultraviolet absorber. Examples of the UV absorber include those similar to the UV absorber contained in the dye-containing pressure-sensitive adhesive layer 3, and include benzotriazole-based UV absorbers, benzophenone-based UV absorbers, salicylate-based UV absorbers, and cyanoacrylate-based UV rays. Examples of the absorbent include triazine-based ultraviolet absorbers, oxanilide-based ultraviolet absorbers, nickel complex-based ultraviolet absorbers, and inorganic ultraviolet absorbers. The ultraviolet absorbent contained in the ultraviolet absorbent film 7 may be the same as or different from the ultraviolet absorbent contained in the dye-containing pressure-sensitive adhesive layer 3.

  As the constituent material other than the ultraviolet absorber of the ultraviolet absorbing film 7, a resin material is preferable. For example, polyesters such as polyethylene terephthalate (PET) and polybutylene terephthalate (PBT), polyolefins such as polyethylene and polypropylene, and polymethyl methacrylate (PMMA). Such as polyacrylate, polycarbonate (PC), polystyrene, triacetate, polyvinyl alcohol, polyvinyl chloride, polyvinylidene chloride, ethylene-vinyl acetate copolymer, polyvinyl butyral, polyurethane, cellophane and the like.

  0.1-30 mass parts is preferable with respect to 100 mass parts of resin materials, and, as for content of a ultraviolet absorber, 0.5-20 mass parts is more preferable. By setting the content of the ultraviolet absorber to 0.1 parts by mass or more, the ultraviolet absorbing function can be sufficiently exhibited, and by setting the content to 30 parts by mass or less, other physical properties required for the optical filter 1 can be ensured.

  The ultraviolet absorbing film 7 can be manufactured by mixing an ultraviolet absorbent in a resin material as a main raw material and molding the resin material containing the ultraviolet absorbent into a film shape. The thickness of the ultraviolet absorbing film 7 is preferably 25 to 400 μm, and more preferably 50 to 200 μm. By setting the thickness to 25 μm or more, the ultraviolet absorbing function can be sufficiently exhibited, and by setting the thickness to 400 μm or less, the entire thickness of the optical filter 1 can be suppressed.

  Examples of the antireflection layer 8 include a laminate in which an inorganic compound having a low refractive index and an inorganic compound having a high refractive index are alternately laminated, a layer made of an inorganic compound having a low refractive index, and a layer made of a resin having a low refractive index. It is done. Examples of the resin having a low refractive index include a fluororesin, a silicone resin, and a fluorosilicone resin. Examples of the inorganic compound having a low refractive index include silicon dioxide.

  As the ultraviolet absorbing and antireflective film 4, a commercially available film can be used, and for example, trade name “RL1710UV” manufactured by NOF Corporation can be used.

  Such an optical filter 1 can be manufactured as follows, for example. First, the contrast-enhancing film 2 and the ultraviolet absorbing antireflection film 4 are produced, and a dye-containing pressure-sensitive adhesive composition that becomes the dye-containing pressure-sensitive adhesive layer 3 is prepared. And after apply | coating a pigment | dye containing adhesive composition to the surface used as the image display part side of the ultraviolet absorption antireflection film 4, and making it dry and forming the pigment | dye containing adhesive layer 3, this pigment | dye containing adhesive layer 3 is used. The ultraviolet absorbing and antireflective film 4 is bonded to the contrast enhancing film 2 by use. In this way, the optical filter 1 in which the contrast improving film 2 and the ultraviolet absorbing antireflection film 4 are bonded together by the dye-containing pressure-sensitive adhesive layer 3 can be manufactured.

  In general, since the optical filter is disposed on the front side of the image display unit, an achromatic color is preferred. In the C light source standard calculated according to JIS Z 8701-1999, the chromaticity coordinates corresponding to the achromatic color are (x, y) = (0.310, 0.316), and therefore the optical filter 1 of the present invention. Is preferably chromaticity coordinates (x, y) = (0.310 ± 0.100, 0.316 ± 0.100). As a method of setting the chromaticity coordinates of the optical filter 1 to the above-mentioned value, for example, after appropriately selecting the type and content of the color tone correction dye and the near-infrared absorbing dye to be contained in the adhesive, the chromaticity coordinates are determined according to the chromaticity. The method of selecting the kind of film etc. to be used is mentioned.

  In general, the luminous average transmittance of the optical filter is preferably 25% or more, and more preferably 45% or more. Examples of a method for setting the average luminous transmittance of the optical filter 1 of the present invention to 45% or more include, for example, a method of selecting a highly transparent film or the like to be used, a color correction dye or a near infrared ray to be contained in an adhesive. The method of selecting suitably the kind and content of an absorption pigment | dye is mentioned. The visual average transmittance of the optical filter 1 is preferably 80% or less, more preferably 90% or less, and most preferably 95% or less. In addition, since contrast may fall when the transmittance | permeability becomes high, 20-70% is actually preferable for a luminous average transmittance | permeability, and 30-60% is more preferable.

  The image display device of the present invention has the optical filter 1 of the present invention on the front side of the image display unit. As the image display device, a plasma panel display device is preferable, and is not necessarily limited thereto. For example, a cathode ray tube display device, a liquid crystal display device, an electroluminescent display device, or the like may be used. In this case, the optical filter 1 may be installed on the front side of the image display unit, may be installed away from the image display unit, or may be directly attached to the image display unit.

  The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the above-described embodiments, and various modifications and substitutions are made to the above-described embodiments without departing from the scope of the present invention. be able to.

  For example, it is preferable that the optical filter 1 of the present invention has the contrast improving film 2 and is disposed in contact with the dye-containing pressure-sensitive adhesive layer 3 on the front side thereof because the number of stacked layers can be reduced. In addition, the dye-containing adhesive layer 3 is disposed on the front surface (human side) of the contrast improving film 2 so that it has a good appearance and good color appearance (colors appear to be tightened), and the unevenness and defects of the CRF are not noticeable. Therefore, it is preferable.

  The contrast improving film 2 and the dye-containing pressure-sensitive adhesive layer 3 do not necessarily need to be in contact with each other. Moreover, the contrast improving film 2 is not necessarily provided, and the dye-containing pressure-sensitive adhesive layer 3 may be disposed in contact with the front side of a transparent substrate such as a glass substrate or a transparent resin film.

  Moreover, as the ultraviolet absorbing layer containing the ultraviolet absorber, the ultraviolet absorbing film 7 of the ultraviolet absorbing antireflection film 4 is preferable, but the ultraviolet absorbing film 7 is not necessarily provided on the ultraviolet absorbing antireflection film 4. However, it may be provided on another functional film, and is not necessarily in the form of a film, and may be a coating layer formed by a coating method or the like.

  Furthermore, the optical filter 1 of the present invention includes various support films and functional films other than the contrast enhancement film 2 and the ultraviolet light absorbing antireflection film 4 as necessary and within the limits not departing from the spirit of the present invention. An adhesive layer or the like for attaching the support film or the functional film can be provided. Examples of the functional film include an electromagnetic wave shielding film. The optical filter 1 of the present invention only needs to have at least a predetermined dye-containing pressure-sensitive adhesive layer 3 and a predetermined ultraviolet absorbing layer disposed on the front side thereof.

Hereinafter, the optical filter of the present invention will be described more specifically with reference to examples.
Examples 1-4 are Examples and Examples 5-7 are comparative examples.

(Example 1)
First, the contrast enhancement film 2 was produced as shown below.
A 100 μm thick strip-like PET film (trade name “A4300”, manufactured by Toyobo Co., Ltd.) that has been subjected to easy adhesion on both sides as a transparent support 5 is prepared, and an ultraviolet curable prepolymer comprising a urethane acrylate prepolymer and A composition for forming a translucent region containing a photopolymerization initiator was applied to a thickness of 89 μm.

  A metallic shaping roll is pressed against the surface of the coating layer, and the composition for forming a translucent region is cured by irradiating ultraviolet rays from the back side while engraving grooves for forming the dark color portion 6b. The light region 6a was formed. The grooves were formed in a substantially trapezoidal cross section, with a width of 10 μm on the opening side, a width of 7 μm on the bottom side, a depth of 69 μm, and a pitch of 51 μm. The shaping type roll has convex portions corresponding to the groove portions in the circumferential direction, and the groove portions are rotated in the longitudinal direction on the strip-shaped PET film coated with the above-described translucent region forming composition. Can be formed.

  On the other hand, in 100 parts by mass of a transparent acrylic UV curable prepolymer, 50 parts by mass of black spherical bead-shaped particles having a minimum particle size of 2 μm and a maximum particle size of 3 μm, and 1-hydroxy-cyclo as a photopolymerization initiator. 2 parts by mass of xyl-phenyl-ketone (trade name “Irgacure 184” manufactured by Ciba Specialty Chemicals Co., Ltd.) was mixed to prepare a liquid dark part forming composition.

  This composition for forming a dark color portion was applied mainly to the groove portion between the above-described translucent regions 6a, and was wiped with a doctor blade. At the time of wiping, the composition for forming a dark color part was cured by irradiating ultraviolet rays from the back side at the same time. The wiping was repeated twice with the gap between the flat portion of the translucent region 6a and the doctor blade being 1.5 μm. As a result, a dark color portion 6b is formed in the groove portion, and only the resin component is left on the flat portion of the translucent region 6a with a thickness of 1.5 μm, and cured by irradiation with the above-described ultraviolet rays to have a thickness of 1 μm. A transparent protective layer was formed, a contrast enhancement layer 6 was formed, and a contrast enhancement film 2 was produced. [Refractive index of resin portion (dark color portion 6b, in transparent protective layer)]-[Refractive index of spherical beads] =-0.003. Moreover, the recessed part which was depressed toward the groove part was formed in the surface of the dark color part 6b, and the depth was 3 micrometers from the surface of the transparent protective layer.

Next, an optical filter 1 was produced using the above-described contrast improving film 2.
First, 6659 parts by mass of MEK (methyl ethyl ketone), 0.0659 parts by mass of a dithiol complex-based light stabilizer (manufactured by Wako Pure Chemical Industries, Ltd., trade name “bis (dibutyldithiocarbamic acid) nickel II”), an ultraviolet absorber (Ciba) 1.69 parts by mass of a product name “TINUVIN 479” manufactured by the company, and 0.0150 parts by mass of a tetraazaporphyrin compound (manufactured by Yamada Chemical Co., Ltd., product name “TAP18”) as a color tone-correcting dye were added, and 10 Stir for minutes to dissolve. To this solution, 30 parts by mass of an acrylic pressure-sensitive adhesive (trade name “NCK101”, manufactured by Toyo Ink Co., Ltd., acid value: 0 mg KOH / g, Tg: −20 ° C.) and a crosslinking agent (trade name “Coronate HL, manufactured by Nippon Polyurethane Co., Ltd.” )) Was added, and the mixture was further stirred and dissolved for 10 minutes with a mixer to prepare a dye-containing pressure-sensitive adhesive composition.

  The above-mentioned dye-containing pressure-sensitive adhesive composition is applied with an applicator on a separator having a silicone resin layer formed on the surface of a PET film, and dried in an oven at 100 ° C. for 5 minutes to form a dye-containing pressure-sensitive adhesive layer 3 having a thickness of 25 μm. Formed. The separator having the dye-containing pressure-sensitive adhesive layer 3 is laminated on the ultraviolet-absorbing antireflection film 4 (manufactured by NOF Corporation, trade name “RL1710UV”, thickness of the ultraviolet-absorbing film 7 is 100 μm), and the dye-containing pressure-sensitive adhesive layer 3 An ultraviolet-absorbing antireflection film 4 having the following was obtained. Thereafter, the separator was peeled off and laminated on the contrast improving layer 6 of the contrast improving film 2 to produce the optical filter 1.

(Example 2)
Optical filter 1 in the same manner as in Example 1 except that the tetraazaporphyrin compound as a color tone correcting dye was changed to a phthalocyanine compound (manufactured by Nippon Shokubai Co., Ltd., trade name “EEX Color IR-12”) as a near-infrared absorbing dye. Was made.

(Example 3)
An optical filter 1 was produced in the same manner as in Example 1 except that the contrast enhancement film 2 was changed to a PET film. That is, an optical filter 1 was prepared by laminating a UV absorbing antireflection film 4 having the same dye-containing pressure-sensitive adhesive layer 3 as in Example 1 on a PET film (trade name “A4300” manufactured by Toyobo Co., Ltd.).

(Example 4)
An optical filter 1 was produced in the same manner as in Example 1 except that the contrast enhancement film 2 was changed to a glass substrate. That is, the optical filter 1 was produced by laminating the ultraviolet absorbing antireflection film 4 having the same dye-containing pressure-sensitive adhesive layer 3 as in Example 1 on a glass substrate.

(Example 5)
An optical filter 1 was produced in the same manner as in Example 1 except that no ultraviolet absorber (trade name “TINUVIN 479” manufactured by Ciba) was included in the preparation of the dye-containing pressure-sensitive adhesive composition.

(Example 6)
An optical filter 1 was produced in the same manner as in Example 1 except that the ultraviolet absorbing antireflection film 4 (trade name “RL1710UV” manufactured by NOF Corporation) was changed to a PET film (trade name “A4300” manufactured by Toyobo Co., Ltd.). did.

(Example 7)
Except that the dithiol complex-based light stabilizer (manufactured by Wako Pure Chemical Industries, trade name “bis (dibutyldithiocarbamate) nickel II”) was not included in the preparation of the dye-containing pressure-sensitive adhesive composition, the same as in Example 1 Thus, an optical filter 1 was produced.

  Next, the heat resistance and light resistance of the optical filters 1 of Examples 1 to 7 were evaluated by the methods described below. The results are shown in Table 1.

(Heat-resistant)
A 20 × 20 mm square test piece is cut out from each optical filter 1, and a spectrum is measured in the range of 380 to 1300 nm using a spectrophotometer (manufactured by Shimadzu Corp., SolidSpec-3700), and is observed according to JIS Z8701-1999. The average transmittance Tv and chromaticity coordinates (x, y) were calculated. Then, using a thermostat (trade name “DS-44”, manufactured by Yamato Co., Ltd.), set the temperature to 80 ° C., leave it at high temperature for 96 hours, measure the spectrum again, and measure the luminous average transmittance Tv and chromaticity coordinates. (X, y) was calculated, and the amount of change (ΔTv, Δx, Δy) before and after being left at high temperature was determined. In the table, “◯” indicates that the amount of change before and after the test is less than 5%, and “△” indicates that any one of them is 5% or more and less than 10%, and any one indicates 10% or more. The thing was shown by "x".

(Light resistance)
Similar to the evaluation of heat resistance, the luminous average transmittance Tv and chromaticity coordinates (x, y) were determined. Thereafter, using a light resistance tester (trade name “Xenon Weather Meter X25” manufactured by Suga Test Instruments Co., Ltd.), after irradiation with light of 380 nm or more at 100 MJ / cm ² , the luminous average transmittance Tv and chromaticity coordinates (x , Y) and the amount of change (ΔTv, Δx, Δy) before and after irradiation was obtained. In the table, “◯” indicates that the amount of change before and after the test is less than 5%, and “△” indicates that any one of them is 5% or more and less than 10%, and any one indicates 10% or more. The thing was shown by "x".

  According to the optical filter 1 of Examples 1 to 4, in which the dye-containing pressure-sensitive adhesive layer 3 contains a light stabilizer and an ultraviolet absorber, and an ultraviolet absorbing layer containing an ultraviolet absorber is provided on the front side thereof, the light resistance is particularly high. It is recognized that the change in optical properties due to the test is suppressed and the durability is excellent. On the other hand, according to the optical filter 1 of Examples 5 to 7 which lacks either the light stabilizer or the ultraviolet absorber in the dye-containing pressure-sensitive adhesive layer 3 or the ultraviolet absorbing layer containing the ultraviolet absorber, the optical characteristics by the light resistance test It is recognized that the change of is large.

  DESCRIPTION OF SYMBOLS 1 ... Optical filter, 2 ... Contrast improvement film, 3 ... Dye containing adhesive layer, 4 ... Ultraviolet absorption antireflection film, 5 ... Transparent support, 6 ... Contrast improvement layer, 6a ... Translucent area | region, 6b ... Dark color part , 7 ... UV absorbing film (UV absorbing layer containing UV absorber), 8 ... Antireflection layer

Claims (6)

An optical filter disposed on the front side of an image display unit in an image display device,
A dye-containing pressure-sensitive adhesive layer containing at least one dye selected from a color correction dye and a near-infrared absorbing dye, a light stabilizer, and an ultraviolet absorber;
And an ultraviolet absorbing layer containing an ultraviolet absorber disposed on the front side of the dye-containing pressure-sensitive adhesive layer. An optical filter disposed on the front side of an image display unit in an image display device,
A contrast improving layer comprising a cured product of a composition having a light-transmitting region and a dark color portion and at least one of the light-transmitting region and the dark color portion containing an ultraviolet curable resin and a photopolymerization initiator;
A dye-containing pressure-sensitive adhesive that is disposed in contact with the contrast-enhancing layer on the front side of the contrast-enhancing layer and contains at least one dye selected from a color correction dye and a near-infrared absorbing dye, a light stabilizer, and an ultraviolet absorber Layers,
And an ultraviolet absorbing layer containing an ultraviolet absorber disposed on the front side of the dye-containing pressure-sensitive adhesive layer.   The optical filter according to claim 1, wherein the light stabilizer is a dithiol complex-based light stabilizer.   The resin film containing an ultraviolet absorber is provided on the front side of the dye-containing pressure-sensitive adhesive layer, and the resin film containing the ultraviolet absorber also serves as the ultraviolet absorbing layer. The optical filter according to claim 1.   The front surface of the dye-containing pressure-sensitive adhesive layer has an ultraviolet-absorbing antireflection film in which an anti-reflection layer is formed on a resin film containing an ultraviolet absorber, and the resin film containing the ultraviolet absorber absorbs the ultraviolet light. The optical filter according to claim 1, which also serves as a layer. An image display device in which an optical filter is arranged on the front side of the image display unit,
An image display device, wherein the optical filter is the optical filter according to claim 1.

Images