Colored layer-forming composition, optical film, and display device

Abstract

To provide a colored layer forming composition capable of forming a colored layer which has an improved color correction function and can withstand long-term use.SOLUTION: A coloring composition contains a dye (A), an active energy-ray curable resin (B), a photopolymerization initiator (C), and a solvent (D). The dye (A) contains at least one of a first colorant having a maximum absorption wavelength in a first range of 470-530 nm and a half-width of an absorption spectrum of 15-45 nm, a second colorant having a maximum absorption wavelength in a second range of 560-620 nm and a half-width of the absorption spectrum of 15-55 nm, and a third colorant wherein, in the wavelength range of 400-780 nm, a wavelength having the lowest transmittance is within a third range of 650 nm or more and 780 nm or less. The coloring composition has a lowest transmittance of 1% or more and less than 50% in only one of the first range, the second range, and the third range. The active energy-ray curable resin (B) contains a resin having an amine structure.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a colored layer-forming composition, an optical film, and a display device. [Background technology]

[0002] 2. Description of the Related Art In order to improve the color purity of a display device, a method is known in which white light or monochromatic light emitted from a light source of the display device is color-separated or corrected using a color filter to narrow the half-value range.

[0003] To improve color purity using color filters, it is necessary to increase the color material concentration or thicken the filter. Increasing the color material concentration can deteriorate photolithography characteristics. Increasing the filter thickness can deteriorate pixel shape and viewing angle characteristics. Furthermore, color filters with improved color purity generally have low transmittance, which tends to reduce luminance efficiency.

[0004] As a method for improving color purity without using a color filter, Patent Document 1 discloses a display filter in which a color correction layer is provided on a filter base having an anti-reflection layer and an electromagnetic wave blocking layer. Because this display filter has a configuration in which a color correction layer is provided on an anti-reflection film, no photolithography process is required for manufacturing, and brightness efficiency is less likely to decrease. Patent Document 2 discloses a coloring material suitable for a color correction layer. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-226239 [Patent Document 2] Patent No. 6142398 Summary of the Invention [Problem to be solved by the invention]

[0006] Many of the functional dyes contained in the coloring materials used in the color correction layer do not have high light resistance, heat resistance, or moist heat resistance. Therefore, in optical filters using such functional dyes, the functionality of the functional dyes deteriorates over time, and the color correction function cannot be fully demonstrated. The inventors have investigated this point and completed the present invention.

[0007] An object of the present invention is to provide a colored layer-forming composition that has a good color correction function and can form a colored layer that can withstand long-term use. [Means for solving the problem]

[0008] A first aspect of the present invention is a colored composition containing a dye (A), an active energy ray-curable resin (B), a photopolymerization initiator (C), and a solvent (D). The dye (A) contains at least one of a first coloring material having a maximum absorption wavelength within a first range of 470 to 530 nm and an absorption spectrum half width of 15 to 45 nm, a second coloring material having a maximum absorption wavelength within a second range of 560 to 620 nm and an absorption spectrum half width of 15 to 55 nm, and a third coloring material having the lowest transmittance at a wavelength within a wavelength range of 400 to 780 nm within a third range of 650 nm or more and 780 nm or less. This coloring composition has a minimum transmittance of 1% or more and less than 50% in only one of the first range, the second range, and the third range. The active energy ray-curable resin (B) contains a resin having an amine structure.

[0009] A second aspect of the present invention is an optical film having a colored layer that is a cured product of the colored layer-forming composition related to the first aspect, a transparent substrate located on one side of the colored layer, and a functional layer located on one or the other side of the colored layer. One or both of the transparent substrate and the functional layer has an ultraviolet ray shielding rate of 85% or more as measured in accordance with the method described in JIS L1925. The functional layer functions as an anti-reflection layer or an anti-glare layer. A third aspect of the present invention is a display device comprising the optical film according to the second aspect. [Effects of the Invention]

[0010] According to the present invention, it is possible to provide a colored layer-forming composition that has a good color correction function and can form a colored layer that can withstand long-term use. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a schematic cross-sectional view of an optical film 1 according to a first embodiment of the present invention. [Figure 2] FIG. 1 is a schematic cross-sectional view of an optical film 1A according to a second embodiment of the present invention. [Figure 3] FIG. 2 is a schematic cross-sectional view of an optical film 1B according to a third embodiment of the present invention. [Figure 4] FIG. 10 is a schematic cross-sectional view of an optical film 1C according to a fourth embodiment of the present invention. [Figure 5] 1 is a graph showing a light transmission profile of a transparent substrate. [Figure 6] 1 shows the spectrum of the light source used to evaluate the transmission characteristics. [Figure 7] This is the spectrum of the light source used to evaluate color reproducibility. DETAILED DESCRIPTION OF THE INVENTION

[0012] 1 to 4 are schematic cross-sectional views of optical films 1 according to first to fourth embodiments of the present invention, respectively. The upper side in Figs. 1 to 4 corresponds to the observation side when observing a displayed image on a display device. Hereinafter, the first embodiment of the present invention will be described with reference to Fig. 1. 1 is a schematic cross-sectional view of an optical film 1 according to this embodiment. The optical film 1 includes a transparent substrate 10, an optical functional layer 20 formed on a first surface 10a of the substrate 10, and a colored layer 30 formed on a second surface 10b of the substrate 10.

[0013] The substrate 10 has an ultraviolet shielding rate of 85% or more and functions as an ultraviolet absorbing layer for protecting the pigment contained in the colored layer 30 from ultraviolet rays. Here, the ultraviolet shielding rate is a value measured in accordance with JIS L 1925 and calculated by the following formula. UV blocking rate (%) = 100 - average transmittance of UV rays with wavelengths of 290 to 400 nm (%)

[0014] Examples of materials for the substrate 10 include polyolefins such as polyethylene and polypropylene, polyesters such as polybutylene terephthalate and polyethylene naphthalate, polyamides such as nylon 6 and nylon 66, polyacrylates such as polymethyl methacrylate (PMMA), transparent resins such as triacetyl cellulose (TAC), polyethylene terephthalate (PET), polyimide, polyarylate, polycarbonate, polyacrylate, polyvinyl alcohol, polyvinyl chloride, cycloolefin copolymers, norbornene-containing resins, polyethersulfone, and polysulfone, and inorganic glass. Among these, films made of polyethylene terephthalate are preferred. The thickness of the substrate 10 is not particularly limited, but is preferably 10 to 100 μm. Figure 5 shows the light transmission profiles of transparent substrates made of these materials. The UV shielding rates of the substrates in Figure 5 are as follows, and any of these can be used as the substrate 10. TAC: 91.7% PMMA: 90.2% PET: 88.1%

[0015] The ultraviolet absorbing properties of the substrate 10 can be imparted by, for example, blending an ultraviolet absorbing agent into the resin material for forming the substrate 10. The ultraviolet absorbing agent is not particularly limited, but benzophenone-based, benzotriazole-based, triazine-based, oxalic acid anilide-based, and cyanoacrylate-based compounds can be used.

[0016] The optical functional layer 20 shown in FIG. 1 has a hard coat layer 21 in contact with the first surface, and a low refractive index layer 22 formed on the hard coat layer 21.

[0017] The hard coat layer 21 is a hard resin layer that enhances the scratch resistance of the optical film 1. The resin that constitutes the hard coat layer 21 is a resin that polymerizes and hardens when irradiated with active energy rays such as ultraviolet rays or electron beams, and for example, a monofunctional, difunctional, or trifunctional or higher functional (meth)acrylate monomer can be used. In this specification, "(meth)acrylate" is a general term for both acrylate and methacrylate, and "(meth)acryloyl" is a general term for both acryloyl and methacryloyl.

[0018] Examples of monofunctional (meth)acrylate compounds include 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, t-butyl (meth)acrylate, glycidyl (meth)acrylate, acryloylmorpholine, N-vinylpyrrolidone, tetrahydrofurfuryl acrylate, cyclohexyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, and isobornyl (meth)acrylate. acrylate, isodecyl (meth)acrylate, lauryl (meth)acrylate, tridecyl (meth)acrylate, cetyl (meth)acrylate, stearyl (meth)acrylate, benzyl (meth)acrylate, 2-ethoxyethyl (meth)acrylate, 3-methoxybutyl (meth)acrylate, ethyl carbitol (meth)acrylate, phosphate (meth)acrylate, ethylene oxide-modified phosphate (meth)acrylate, phenoxy (meth)acrylate, ethylene oxide-modified phenoxy (meth)acrylate, propylene oxide Oxide-modified phenoxy (meth)acrylate, nonylphenol (meth)acrylate, ethylene oxide-modified nonylphenol (meth)acrylate, propylene oxide-modified nonylphenol (meth)acrylate, methoxydiethylene glycol (meth)acrylate, methoxypolyethylene glycol (meth)acrylate, methoxypropylene glycol (meth)acrylate, 2-(meth)acryloyloxyethyl-2-hydroxypropyl phthalate, 2-hydroxy-3-phenoxypropyl (meth)acrylate, 2-(meth)acryloyloxyethyl-2-hydroxypropyl phthalate, ) acryloyloxyethyl hydrogen phthalate, 2-(meth)acryloyloxypropyl hydrogen phthalate, 2-(meth)acryloyloxypropyl hexahydrohydrogen phthalate, 2-(meth)acryloyloxypropyl tetrahydrohydrogen phthalate, dimethylaminoethyl (meth)acrylate, trifluoroethyl (meth)acrylate, tetrafluoropropyl (meth)acrylate, hexafluoropropyl (meth)acrylate, octafluoropropyl (meth)acrylate, 2-adamantane,Examples include adamantane derivative mono(meth)acrylates such as adamantyl acrylate having a monovalent mono(meth)acrylate derived from adamantanediol.

[0019] Examples of bifunctional (meth)acrylate compounds include di(meth)acrylates such as ethylene glycol di(meth)acrylate, diethylene glycol di(meth)acrylate, butanediol di(meth)acrylate, hexanediol di(meth)acrylate, nonanediol di(meth)acrylate, ethoxylated hexanediol di(meth)acrylate, propoxylated hexanediol di(meth)acrylate, diethylene glycol di(meth)acrylate, polyethylene glycol di(meth)acrylate, tripropylene glycol di(meth)acrylate, polypropylene glycol di(meth)acrylate, neopentyl glycol di(meth)acrylate, ethoxylated neopentyl glycol di(meth)acrylate, tripropylene glycol di(meth)acrylate, and hydroxypivalic acid neopentyl glycol di(meth)acrylate.

[0020] Examples of trifunctional or higher (meth)acrylate compounds include tri(meth)acrylates such as trimethylolpropane tri(meth)acrylate, ethoxylated trimethylolpropane tri(meth)acrylate, propoxylated trimethylolpropane tri(meth)acrylate, tris(2-hydroxyethylisocyanurate tri(meth)acrylate, glycerin tri(meth)acrylate, etc., trifunctional (meth)acrylate compounds such as pentaerythritol tri(meth)acrylate, dipentaerythritol tri(meth)acrylate, and ditrimethylolpropane tri(meth)acrylate. and polyfunctional (meth)acrylate compounds having three or more functional groups such as pentaerythritol tetra(meth)acrylate, ditrimethylolpropane tetra(meth)acrylate, dipentaerythritol tetra(meth)acrylate, dipentaerythritol penta(meth)acrylate, ditrimethylolpropane penta(meth)acrylate, dipentaerythritol hexa(meth)acrylate, and ditrimethylolpropane hexa(meth)acrylate, as well as polyfunctional (meth)acrylate compounds in which a portion of these (meth)acrylates is substituted with an alkyl group or ε-caprolactone.

[0021] Urethane (meth)acrylates can also be used as the active energy ray-curable resin. Examples of urethane (meth)acrylates include those obtained by reacting a polyester polyol with an isocyanate monomer or a prepolymer, and then reacting the resulting product with a (meth)acrylate monomer having a hydroxyl group.

[0022] Examples of urethane (meth)acrylates include pentaerythritol triacrylate hexamethylene diisocyanate urethane prepolymer, dipentaerythritol pentaacrylate hexamethylene diisocyanate urethane prepolymer, pentaerythritol triacrylate toluene diisocyanate urethane prepolymer, dipentaerythritol pentaacrylate toluene diisocyanate urethane prepolymer, pentaerythritol triacrylate isophorone diisocyanate urethane prepolymer, and dipentaerythritol pentaacrylate isophorone diisocyanate urethane prepolymer.

[0023] The above-mentioned resins may be used alone or in combination of two or more. The above-mentioned resins may be monomers in the composition for forming a hard coat layer, or may be partially polymerized oligomers. The hardness of the hard coat layer 21 is preferably such that the pencil hardness of the surface under a 500 g load is H or higher.

[0024] The hard coat layer 21 may contain an ultraviolet absorber to suppress deterioration of the pigment contained in the colored layer 30. Similar to the substrate 10, the ultraviolet shielding rate of the hard coat layer 21 is preferably 85% or higher. The ultraviolet absorber contained in the hard coat layer 21 preferably absorbs wavelengths in the ultraviolet range of 290 to 370 nm. Examples of such ultraviolet absorbers include benzophenone-based, benzotriazole-based, triazine-based, oxalic acid anilide-based, and cyanoacrylate-based compounds. Since the ultraviolet absorber is incorporated to suppress deterioration of the pigment contained in the colored layer 30, an ultraviolet absorber that absorbs light in the ultraviolet range that contributes to deterioration of the pigment contained in the colored layer 30 is used. However, if the amount of ultraviolet light absorbed by the ultraviolet absorber is too high when curing a composition containing an ultraviolet absorber, the composition will not cure sufficiently, resulting in an optical film with insufficient surface hardness. Therefore, in the present invention, by using an ultraviolet absorber whose absorption wavelength range in the ultraviolet region is different from that of the photopolymerization initiator, curing inhibition when the ultraviolet absorber is contained is suppressed. When the absorption wavelength range of the ultraviolet absorber contained in any layer constituting the ultraviolet absorbing layer is set to this range, an acylphosphine oxide-based photopolymerization initiator whose absorption wavelength range is different from the ultraviolet absorber wavelength range can be preferably used. Examples of acylphosphine oxide-based photopolymerization initiators include diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide and phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide. By making the absorption wavelength ranges of the ultraviolet absorber and the photopolymerization initiator different, curing inhibition when forming an ultraviolet absorbing layer containing the ultraviolet absorber can be suppressed, and after curing, deterioration of the pigment contained in the colored layer 30 due to ultraviolet light can be suppressed.

[0025] Other photopolymerization initiators that can be used in the composition for forming a hard coat layer include, for example, 2,2-ethoxyacetophenone, 1-hydroxycyclohexylphenyl ketone, dibenzoyl, benzoin, benzoin methyl ether, benzoin ethyl ether, p-chlorobenzophenone, p-methoxybenzophenone, Michler's ketone, acetophenone, 2-chlorothioxanthone, etc. One of these may be used alone, or two or more may be used in combination.

[0026] Examples of solvents used in the hard coat layer-forming composition include ethers such as dibutyl ether, dimethoxymethane, dimethoxyethane, diethoxyethane, propylene oxide, 1,4-dioxane, 1,3-dioxolane, 1,3,5-trioxane, tetrahydrofuran, anisole, and phenetole, ketones such as acetone, methyl ethyl ketone, diethyl ketone, dipropyl ketone, diisobutyl ketone, methyl isobutyl ketone, cyclopentanone, cyclohexanone, methylcyclohexanone, and methylcyclohexanone, esters such as ethyl formate, propyl formate, n-pentyl formate, methyl acetate, ethyl acetate, methyl propionate, ethyl propionate, n-pentyl acetate, and γ-butyrolactone, and cellosolves such as methyl cellosolve, cellosolve, butyl cellosolve, and cellosolve acetate. These may be used alone or in combination of two or more.

[0027] The composition for forming a hard coat layer may contain metal oxide fine particles for the purpose of adjusting the refractive index or imparting hardness. Examples of the metal oxide fine particles include zirconium oxide, titanium oxide, niobium oxide, antimony trioxide, antimony pentoxide, tin oxide, indium oxide, indium tin oxide, and zinc oxide.

[0028] The composition for forming a hard coat layer may also contain any of silicon oxide, fluorine-containing silane compound, fluoroalkylsilazane, fluoroalkylsilane, fluorine-containing silicon compound, and perfluoropolyether group-containing silane coupling agent, which impart water repellency and / or oil repellency and enhance antifouling properties.

[0029] Other additives that may be added to the composition for forming a hard coat layer include a leveling agent, an antifoaming agent, an antioxidant, a light stabilizer, a photosensitizer, and a conductive material.

[0030] When the optical film 1 is applied to a display device, the low refractive index layer 22 is disposed on the side closest to a user (viewer) who views the display. The low refractive index layer 22 prevents strong reflection of external light and improves the visibility of the display device.

[0031] The refractive index of the low refractive index layer 22 should be lower than the refractive index of the hard coat layer 21, and is preferably 1.55 or less. The thickness of the low refractive index layer 22 is not particularly limited, but is preferably 40 nm to 1 μm.

[0032] The low refractive index layer 22 may contain any of silicon oxide, a fluorine-containing silane compound, a fluoroalkylsilazane, a fluoroalkylsilane, a fluorine-containing silicon-based compound, and a perfluoropolyether group-containing silane coupling agent. These materials can impart water repellency and / or oil repellency to the low refractive index layer 22, thereby improving the antifouling properties.

[0033] ≪Colored layer≫ The colored layer 10 is a cured product of the colored layer-forming composition of the present invention. The colored layer-forming composition of the present invention contains a dye (A), an active energy ray-curable resin (B), a photopolymerization initiator (C), and a solvent (D). The colored layer-forming composition of the present invention may further contain an additive (E) described below.

[0034] The thickness of the colored layer 10 is preferably, for example, 0.5 to 10 μm. When the thickness of the colored layer 10 is equal to or greater than the above-mentioned lower limit, the colored layer 10 can contain a dye without causing abnormalities in the appearance, and the light absorption properties of the dye can improve the reflectivity and color reproducibility. When the thickness of the colored layer 10 is equal to or less than the above-mentioned upper limit, it is advantageous for making the display device thinner. The thickness of the colored layer 10 can be determined by observing a cross section of the optical film 1 in the thickness direction using a microscope or the like.

[0035] <Dye (A)> The dye (A) contains at least one of the following three types of coloring materials for selectively absorbing the wavelength band of visible light. The type of coloring material that may be contained is not limited to one type. The first colorant has a maximum absorption wavelength in a first range of 470 nm to 530 nm and a half-width (full width at half maximum) of an absorption spectrum of 15 nm to 45 nm. If the maximum absorption wavelength is less than the above-mentioned lower limit, the luminance efficiency of blue light emission is likely to decrease, while if it exceeds the above-mentioned upper limit, the luminance efficiency of green light emission is likely to decrease. If the half-width of the absorption spectrum is less than the above-mentioned lower limit, the suppression effect on the reflectivity to external light is small, while if it exceeds the above-mentioned upper limit, the reflectivity to external light is likely to improve but the luminance efficiency is likely to decrease. The second colorant has a maximum absorption wavelength within a second range of 560 nm to 620 nm and a half-width of the absorption spectrum of 15 nm to 55 nm. If the maximum absorption wavelength is less than the lower limit, the luminance efficiency of green light emission is likely to decrease, while if it exceeds the upper limit, the luminance efficiency of red light emission is likely to decrease. If the half-width of the absorption spectrum is less than the lower limit, the suppression effect on the reflectivity to external light is small, while if it exceeds the upper limit, the reflectivity to external light is likely to improve but the luminance efficiency is likely to decrease. The third coloring material has a wavelength with the lowest transmittance in the wavelength range of 400 to 800 nm that is in a third range of 650 to 800 nm. The colored layer 30 has a maximum absorption wavelength with a transmittance of 1% or more and less than 50% in only one of the first range, second range, and third range. By using the first to third coloring materials contained in the coloring layer 30 that have the above-mentioned absorption characteristics, it is possible to make the coloring layer 30 absorb visible light in a wavelength range with relatively low emission intensity among the visible light emitted by the display device.

[0036] The first, second, and third coloring materials may include one or more compounds selected from the group consisting of compounds having a porphyrin structure, a merocyanine structure, a phthalocyanine structure, an azo structure, a cyanine structure, a squarylium structure, a coumarin structure, a polyene structure, a quinone structure, a tetradiporphyrin structure, a pyrromethene structure, and an indigo structure, and metal complexes thereof. In particular, it is more preferable to use metal complexes having a porphyrin structure, a pyrromethene structure, or a phthalocyanine structure in the molecule, or squarylium structures. For example, a pyrromethene cobalt complex may be used as the first coloring material. Furthermore, a tetraazaporphyrin copper complex may be used as the second coloring material.

[0037] <Active energy ray curable resin (B)> The active energy ray-curable resin (B) is a resin that polymerizes and hardens when irradiated with active energy rays such as ultraviolet rays and electron beams. For example, monofunctional, difunctional, trifunctional or higher functional (meth)acrylate monomers, urethane (meth)acrylates, etc. can be used, but the active energy ray-curable resin (B) of the present invention includes a resin that has at least the ability to capture radicals (radical scavenging ability). Here, "(meth)acrylate" means both or either "acrylate" and "methacrylate." The resin having radical scavenging ability contained in the active energy ray-curable resin (B) may be a resin having an amine structure. Here, the "amine structure" refers to a structure in which the hydrogen atom of ammonia is substituted with a hydrocarbon group or an aromatic atomic group. Examples of the amine structure include primary amine, secondary amine, and tertiary amine, and may also be a quaternary ammonium cation.

[0038] Resins with radical scavenging ability capture radicals that occur when the dye (A) undergoes oxidative degradation, inhibiting autoxidation and preventing dye degradation (fading). Examples of resins with an amine structure that have radical scavenging ability include resins with a hindered amine structure having a molecular weight of 2000 or more. Resins with a hindered amine structure having a molecular weight of 2000 or more can achieve a high degree of fading inhibition. This is thought to be because many molecules remain within the colored layer 10, resulting in a sufficient fading inhibition effect. The molecular weight of the resin having a hindered amine structure is, for example, about 200,000, but there is no particular upper limit. In this specification, the term "molecular weight" refers to the "weight average molecular weight" measured by gel permeation chromatography (GPC) using polystyrene as a standard substance.

[0039] In this embodiment, the resin having an amine structure with radical scavenging ability may contain a structural unit represented by the following formula (1).

[0040] [ka]

[0041] In formula (1), R 1 represents a hydrogen atom, a halogen atom, a carboxyl group, a sulfo group, a cyano group, a hydroxy group, an alkyl group having 10 or less carbon atoms, an alkoxycarbonyl group having 10 or less carbon atoms, an alkylsulfonylaminocarbonyl group having 10 or less carbon atoms, an arylsulfonylaminocarbonyl group, an alkylsulfonyl group, an arylsulfonyl group, an acylaminosulfonyl group having 10 or less carbon atoms, an alkoxy group having 10 or less carbon atoms, an alkylthio group having 10 or less carbon atoms, an aryloxy group having 10 or less carbon atoms, a nitro group, an alkoxycarbonyloxy group, an aryloxycarbonyloxy group, an acyloxy group having 10 or less carbon atoms, an acyl group having 10 or less carbon atoms, a carbamoyl group, a sulfamoyl group, an aryl group having 10 or less carbon atoms, a substituted amino group, a substituted ureido group, a substituted phosphono group, or a heterocyclic group; R 2represents a hydrogen atom or an alkyl group having 30 or less carbon atoms, and X represents a single bond, an ester group, an aliphatic alkyl chain having 30 or less carbon atoms, an aromatic chain, a polyethylene glycol chain, or a linking group formed by combining these, any of which may contain a spirodioxane ring.

[0042] R 1 is preferably a hydrogen atom, a hydroxy group, or an alkyl group having 10 or less carbon atoms. The alkyl group preferably has 1 to 6 carbon atoms, and more preferably 1 to 3 carbon atoms. R 2 is preferably a hydrogen atom or an alkyl group having 10 or less carbon atoms. The alkyl group preferably has 1 to 6 carbon atoms, more preferably 1 to 3 carbon atoms. X is preferably a single bond or an aliphatic alkyl chain having 30 or less carbon atoms. The aliphatic alkyl chain preferably has 10 or less carbon atoms, more preferably 1 to 6 carbon atoms, and even more preferably 2 to 4 carbon atoms.

[0043] In this embodiment, the resin having an amine structure with radical scavenging ability may be a copolymer of a structural unit represented by formula (1) and a copolymerization component having any of the repeating units described below as the main component (the component with the largest mass % among the components). By using a copolymer, it is possible to control the compatibility with other components.

[0044] Examples of the repeating unit include (meth)acrylate repeating units, olefin repeating units, halogen atom-containing repeating units, styrene repeating units, vinyl acetate repeating units, and vinyl alcohol repeating units.

[0045] Examples of the (meth)acrylate repeating unit include a repeating unit derived from a (meth)acrylate monomer having a linear or branched alkyl group on the side chain, and a repeating unit derived from a (meth)acrylate monomer having a hydroxyl group on the side chain.

[0046] Examples of the repeating units derived from a (meth)acrylate monomer having the linear or branched alkyl group on the side chain include methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, isopropyl (meth)acrylate, butyl (meth)acrylate, isobutyl (meth)acrylate, s-butyl (meth)acrylate, t-butyl (meth)acrylate, pentyl (meth)acrylate, hexyl (meth)acrylate, heptyl (meth)acrylate, octyl (meth)acrylate, and isopropyl (meth)acrylate. Examples of monomer-derived components include octyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, nonyl (meth)acrylate, isononyl (meth)acrylate, decyl (meth)acrylate, isodecyl (meth)acrylate, undecyl (meth)acrylate, dodecyl (meth)acrylate, tridecyl (meth)acrylate, tetradecyl (meth)acrylate, myristyl (meth)acrylate, pentadecyl (meth)acrylate, hexadecyl (meth)acrylate, heptadecyl (meth)acrylate, and octadecyl (meth)acrylate. These may be used alone or in combination of two or more. Among the above, (meth)acrylate-based repeating units having a linear or branched alkyl group having 1 to 4 carbon atoms in the side chain are preferred.

[0047] Examples of the repeating units derived from (meth)acrylic monomers having a hydroxyl group in the side chain include components derived from monomers such as 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 6-hydroxyhexyl (meth)acrylate, hydroxyphenyl (meth)acrylate, etc. These may be used alone or in combination of two or more.

[0048] Examples of olefin repeating units include components derived from olefin monomers such as ethylene, propylene, isoprene, butadiene, etc. These may be used alone or in combination of two or more.

[0049] Examples of the halogen atom-containing repeating unit include components derived from monomers such as vinyl chloride, vinylidene chloride, etc. These may be used alone or in combination of two or more.

[0050] Examples of the styrene repeating unit include components derived from styrene monomers such as styrene, α-methylstyrene, vinyltoluene, etc. These may be used alone or in combination of two or more. Examples of vinyl acetate repeating units include esters of saturated carboxylic acids with vinyl alcohol, such as vinyl acetate and vinyl propionate, which may be used alone or in combination of two or more. An example of the vinyl alcohol repeating unit is vinyl alcohol, which may have a 1,2-glycol bond in the side chain.

[0051] The copolymer may have any of the structures of a random copolymer, an alternating copolymer, a block copolymer, and a graft copolymer. If the copolymer has a random structure, the manufacturing process and preparation with other components are easy. Therefore, a random copolymer is preferable to other copolymers.

[0052] Radical polymerization can be used as a polymerization method for obtaining the copolymer. Radical polymerization is preferred because it is easy to produce industrially. Radical polymerization may be a solution polymerization method, an emulsion polymerization method, a bulk polymerization method, a suspension polymerization method, or the like. For radical polymerization, it is preferable to use a solution polymerization method. By using a solution polymerization method, it is easy to control the molecular weight of the copolymer.

[0053] In the radical polymerization, the above-mentioned monomer may be diluted with a polymerization solvent, and then a polymerization initiator may be added to polymerize the monomer. Examples of the polymerization solvent include ester-based solvents, alcohol ether-based solvents, ketone-based solvents, aromatic solvents, amide-based solvents, and alcohol-based solvents. Examples of the ester-based solvent include methyl acetate, ethyl acetate, n-butyl acetate, isobutyl acetate, t-butyl acetate, methyl lactate, and ethyl lactate. Examples of the alcohol ether-based solvent include ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, propylene glycol monomethyl ether, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether, 3-methoxy-1-butanol, and 3-methoxy-3-methyl-1-butanol. Examples of the ketone-based solvent include acetone, methyl ethyl ketone, methyl isobutyl ketone, and cyclohexanone. Examples of the aromatic solvent include benzene, toluene, and xylene. Examples of the amide-based solvent include formamide and dimethylformamide. The alcohol solvent may be, for example, methanol, ethanol, n-propanol, isopropanol, n-butanol, isobutanol, s-butanol, t-butanol, diacetone alcohol, 2-methyl-2-butanol, etc. The above-mentioned polymerization solvents may be used alone or in combination of two or more.

[0054] The radical polymerization initiator may be, for example, a peroxide or an azo compound. The peroxide may be, for example, benzoyl peroxide, t-butyl peroxyacetate, t-butyl peroxybenzoate, or di-t-butyl peroxide. The azo compound may be, for example, azobisisobutyronitrile, azobisamidinopropane salt, azobiscyanovaleric acid (salt), or 2,2'-azobis[2-methyl-N-(2-hydroxyethyl)propionamide].

[0055] The amount of radical polymerization initiator used is preferably 0.0001 to 20 parts by mass, more preferably 0.001 to 15 parts by mass, and even more preferably 0.005 to 10 parts by mass, when the total amount of monomers is set to 100 parts by mass. The radical polymerization initiator may be added to the monomers and polymerization solvent before the start of polymerization, or may be added dropwise to the polymerization reaction system. Adding the radical polymerization initiator dropwise to the monomers and polymerization solvent in the polymerization reaction system is preferred because it can suppress heat generation due to polymerization.

[0056] The reaction temperature for radical polymerization is appropriately selected depending on the types of radical polymerization initiator and polymerization solvent, and is preferably 60° C. or higher and 110° C. or lower from the viewpoints of ease of production and reaction controllability.

[0057] When the resin having an amine structure with radical scavenging ability is a polymer containing a structural unit represented by formula (1), the content of the structural unit represented by formula (1) is preferably 1 to 100 mol %, more preferably 10 to 100 mol %, based on the total molar amount of the monomers constituting the active energy ray-curable resin (B). When the content of the structural unit represented by formula (1) is within the above range, the light resistance and heat resistance of the dye (A) are improved, and fading is easily suppressed.

[0058] The active energy ray-curable resin (B) may further contain a polymer containing a structural unit represented by the following formula (2).

[0059] [ka]

[0060] In equation (2), R 3represents a hydrogen atom, a halogen atom, a carboxyl group, a sulfo group, a cyano group, a hydroxy group, an alkyl group having 10 or less carbon atoms, an alkoxycarbonyl group having 10 or less carbon atoms, an alkylsulfonylaminocarbonyl group having 10 or less carbon atoms, an arylsulfonylaminocarbonyl group, an alkylsulfonyl group, an arylsulfonyl group, an acylaminosulfonyl group having 10 or less carbon atoms, an alkoxy group having 10 or less carbon atoms, an alkylthio group having 10 or less carbon atoms, an aryloxy group having 10 or less carbon atoms, a nitro group, an alkoxycarbonyloxy group, an aryloxycarbonyloxy group, an acyloxy group having 10 or less carbon atoms, an acyl group having 10 or less carbon atoms, a carbamoyl group, a sulfamoyl group, an aryl group having 10 or less carbon atoms, a substituted amino group, a substituted ureido group, a substituted phosphono group, or a heterocyclic group; R 4 represents a hydrogen atom or an alkyl group having 30 or less carbon atoms, and X represents a single bond, an ester group, an aliphatic alkyl chain having 30 or less carbon atoms, an aromatic chain, a polyethylene glycol chain, or a linking group formed by combining these, any of which may contain a spirodioxane ring.

[0061] R 3 is preferably a hydrogen atom, a hydroxy group, or an alkyl group having 10 or less carbon atoms. The alkyl group preferably has 1 to 6 carbon atoms, and more preferably 1 to 3 carbon atoms. R 4 is preferably a hydrogen atom or an alkyl group having 10 or less carbon atoms. The alkyl group preferably has 1 to 6 carbon atoms, more preferably 1 to 3 carbon atoms. X is preferably a single bond or an aliphatic alkyl chain having 30 or less carbon atoms. The aliphatic alkyl chain preferably has 10 or less carbon atoms, more preferably 1 to 6 carbon atoms, and even more preferably 2 to 4 carbon atoms.

[0062] In this embodiment, the polymer containing the structural unit represented by formula (2) may be a copolymer with a monomer different from the structural unit represented by formula (2). By forming the copolymer, it is possible to control the compatibility with other components.

[0063] Examples of copolymerization components include those having any of the above-mentioned (meth)acrylate repeating units, olefin repeating units, halogen atom-containing repeating units, styrene repeating units, vinyl acetate repeating units, and vinyl alcohol repeating units.

[0064] The copolymer may have any of the structures of a random copolymer, an alternating copolymer, a block copolymer, and a graft copolymer. If the copolymer has a random structure, the manufacturing process and preparation with other components are easy. Therefore, a random copolymer is preferable to other copolymers.

[0065] Radical polymerization can be used as a polymerization method for obtaining the copolymer. Radical polymerization is preferred because it is easy to produce industrially. Radical polymerization may be a solution polymerization method, an emulsion polymerization method, a bulk polymerization method, a suspension polymerization method, or the like. For radical polymerization, it is preferable to use a solution polymerization method. By using a solution polymerization method, it is easy to control the molecular weight of the copolymer.

[0066] In the radical polymerization, the above-mentioned monomer may be diluted with a polymerization solvent, and then a polymerization initiator may be added to polymerize the monomer. Examples of the polymerization solvent include ester-based solvents, alcohol ether-based solvents, ketone-based solvents, aromatic solvents, amide-based solvents, and alcohol-based solvents. Examples of the ester-based solvent include methyl acetate, ethyl acetate, n-butyl acetate, isobutyl acetate, t-butyl acetate, methyl lactate, and ethyl lactate. Examples of the alcohol ether-based solvent include ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, propylene glycol monomethyl ether, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether, 3-methoxy-1-butanol, and 3-methoxy-3-methyl-1-butanol. Examples of the ketone-based solvent include acetone, methyl ethyl ketone, methyl isobutyl ketone, and cyclohexanone. Examples of the aromatic solvent include benzene, toluene, and xylene. Examples of the amide-based solvent include formamide and dimethylformamide. The alcohol solvent may be, for example, methanol, ethanol, n-propanol, isopropanol, n-butanol, isobutanol, s-butanol, t-butanol, diacetone alcohol, 2-methyl-2-butanol, etc. The above-mentioned polymerization solvents may be used alone or in combination of two or more.

[0067] The radical polymerization initiator may be, for example, a peroxide or an azo compound. The peroxide may be, for example, benzoyl peroxide, t-butyl peroxyacetate, t-butyl peroxybenzoate, or di-t-butyl peroxide. The azo compound may be, for example, azobisisobutyronitrile, azobisamidinopropane salt, azobiscyanovaleric acid (salt), or 2,2'-azobis[2-methyl-N-(2-hydroxyethyl)propionamide].

[0068] The amount of radical polymerization initiator used is preferably 0.0001 to 20 parts by mass, more preferably 0.001 to 15 parts by mass, and even more preferably 0.005 to 10 parts by mass, when the total amount of monomers is set to 100 parts by mass. The radical polymerization initiator may be added to the monomers and polymerization solvent before the start of polymerization, or may be added dropwise to the polymerization reaction system. Adding the radical polymerization initiator dropwise to the monomers and polymerization solvent in the polymerization reaction system is preferred because it can suppress heat generation due to polymerization.

[0069] The reaction temperature for radical polymerization is appropriately selected depending on the types of radical polymerization initiator and polymerization solvent, and is preferably 60° C. or higher and 110° C. or lower from the viewpoints of ease of production and reaction controllability.

[0070] When the active energy ray-curable resin (B) contains a polymer containing a structural unit represented by formula (2), the content of the structural unit represented by formula (2) is preferably 1 to 50 mol %, more preferably 1 to 30 mol %, based on the total molar amount of the monomers constituting the active energy ray-curable resin (B). When the content of the structural unit represented by formula (2) is within the above range, the light resistance and heat resistance of the dye (A) are improved, and fading is easily suppressed.

[0071] Other examples of monofunctional (meth)acrylate compounds that can be contained in the active energy ray-curable resin (B) include 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, t-butyl (meth)acrylate, glycidyl (meth)acrylate, acryloylmorpholine, N-vinylpyrrolidone, tetrahydrofurfuryl acrylate, cyclohexyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, methyl ... Cetylhexyl (meth)acrylate, isobornyl (meth)acrylate, isodecyl (meth)acrylate, lauryl (meth)acrylate, tridecyl (meth)acrylate, cetyl (meth)acrylate, stearyl (meth)acrylate, benzyl (meth)acrylate, 2-ethoxyethyl (meth)acrylate, 3-methoxybutyl (meth)acrylate, ethyl carbitol (meth)acrylate, phosphate (meth)acrylate, ethylene oxide-modified phosphate (meth)acrylate, phenoxy (meth)acrylate, ethylene oxide Oxide-modified phenoxy (meth)acrylate, propylene oxide-modified phenoxy (meth)acrylate, nonylphenol (meth)acrylate, ethylene oxide-modified nonylphenol (meth)acrylate, propylene oxide-modified nonylphenol (meth)acrylate, methoxydiethylene glycol (meth)acrylate, methoxypolyethylene glycol (meth)acrylate, methoxypropylene glycol (meth)acrylate, 2-(meth)acryloyloxyethyl-2-hydroxypropyl phthalate, 2-hydroxypropyl acrylate hydroxy-3-phenoxypropyl (meth)acrylate, 2-(meth)acryloyloxyethyl hydrogen phthalate, 2-(meth)acryloyloxypropyl hydrogen phthalate, 2-(meth)acryloyloxypropyl hexahydrohydrogen phthalate, 2-(meth)acryloyloxypropyl tetrahydrohydrogen phthalate, dimethylaminoethyl (meth)acrylate, trifluoroethyl (meth)acrylate, tetrafluoropropyl (meth)acrylate, hexafluoropropyl (meth)acrylate,Examples include adamantane derivative mono(meth)acrylates such as octafluoropropyl(meth)acrylate, 2-adamantane, and adamantyl acrylate having a monovalent mono(meth)acrylate derived from adamantanediol. Here, "(meth)acryloyl" means both or either "acryloyl" and "methacryloyl."

[0072] Other examples of bifunctional (meth)acrylate compounds that can be contained in the active energy ray-curable resin (B) include di(meth)acrylates such as ethylene glycol di(meth)acrylate, diethylene glycol di(meth)acrylate, butanediol di(meth)acrylate, hexanediol di(meth)acrylate, nonanediol di(meth)acrylate, ethoxylated hexanediol di(meth)acrylate, propoxylated hexanediol di(meth)acrylate, diethylene glycol di(meth)acrylate, polyethylene glycol di(meth)acrylate, tripropylene glycol di(meth)acrylate, polypropylene glycol di(meth)acrylate, neopentyl glycol di(meth)acrylate, ethoxylated neopentyl glycol di(meth)acrylate, tripropylene glycol di(meth)acrylate, and hydroxypivalic acid neopentyl glycol di(meth)acrylate.

[0073] Other examples of the trifunctional or higher (meth)acrylate compound that can be contained in the active energy ray-curable resin (B) include tri(meth)acrylates such as trimethylolpropane tri(meth)acrylate, ethoxylated trimethylolpropane tri(meth)acrylate, propoxylated trimethylolpropane tri(meth)acrylate, tris-2-hydroxyethyl isocyanurate tri(meth)acrylate, and glycerin tri(meth)acrylate, and trifunctional compounds such as pentaerythritol tri(meth)acrylate, dipentaerythritol tri(meth)acrylate, and ditrimethylolpropane tri(meth)acrylate. and polyfunctional (meth)acrylate compounds having three or more functional groups such as pentaerythritol tetra(meth)acrylate, ditrimethylolpropane tetra(meth)acrylate, dipentaerythritol tetra(meth)acrylate, dipentaerythritol penta(meth)acrylate, ditrimethylolpropane penta(meth)acrylate, dipentaerythritol hexa(meth)acrylate, and ditrimethylolpropane hexa(meth)acrylate; and polyfunctional (meth)acrylate compounds in which a portion of these (meth)acrylates is substituted with an alkyl group or ε-caprolactone.

[0074] Another resin that can be contained in the active energy ray-curable resin (B) is urethane (meth)acrylate. Examples of urethane (meth)acrylate include those obtained by reacting a polyester polyol with an isocyanate monomer or a prepolymer, and then reacting the resulting product with a (meth)acrylate monomer having a hydroxyl group.

[0075] Examples of urethane (meth)acrylates include pentaerythritol triacrylate hexamethylene diisocyanate urethane prepolymer, dipentaerythritol pentaacrylate hexamethylene diisocyanate urethane prepolymer, pentaerythritol triacrylate toluene diisocyanate urethane prepolymer, dipentaerythritol pentaacrylate toluene diisocyanate urethane prepolymer, pentaerythritol triacrylate isophorone diisocyanate urethane prepolymer, and dipentaerythritol pentaacrylate isophorone diisocyanate urethane prepolymer.

[0076] The monofunctional, difunctional, trifunctional or higher functional (meth)acrylate monomers, urethane (meth)acrylates, etc. that can be contained in the other active energy ray-curable resin (B) may be used alone or in combination of two or more thereof, and may also be partially polymerized oligomers.

[0077] The content of the active energy ray curable resin (B) is preferably 20 to 80 mass %, more preferably 30 to 70 mass %, based on the total mass of the colored layer forming composition. When the content of the active energy ray curable resin (B) is equal to or greater than the above lower limit, the effect of inhibiting fading can be further enhanced. When the content of the active energy ray curable resin (B) is equal to or less than the above upper limit, the handleability of the colored layer forming composition can be further enhanced.

[0078] <Photopolymerization initiator (C)> When ultraviolet rays are used as the active energy rays, the photopolymerization initiator (C) generates radicals when irradiated with ultraviolet rays. Examples of the photopolymerization initiator (C) include benzoins (benzoin alkyl ethers such as benzoin, benzoin methyl ether, benzoin ethyl ether, and benzoin isopropyl ether), phenyl ketones [for example, alkyl phenyl ketones such as acetophenones (e.g., acetophenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 2,2-dimethoxy-2-phenylacetophenone, 2,2-diethoxy-2-phenylacetophenone, and 1,1-dichloroacetophenone), and 2-hydroxy-2-methylpropiophenone; cycloalkyl phenyl ketones such as 1-hydroxycyclohexyl phenyl ketone, and the like], aminoacetophenones {2-methyl-1-[4-(methylthio)phenyl] Examples of the photopolymerization initiator include [2-methyl-2-morpholinoaminopropanone-1, 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl)-butanone-1, etc.], anthraquinones (anthraquinone, 2-methylanthraquinone, 2-ethylanthraquinone, 2-t-butylanthraquinone, 1-chloroanthraquinone, etc.), thioxanthones (2,4-dimethylthioxanthone, 2,4-diethylthioxanthone, 2-chlorothioxanthone, 2,4-diisopropylthioxanthone, etc.), ketals (acetophenone dimethyl ketal, benzyl dimethyl ketal, etc.), benzophenones (benzophenone, etc.), xanthones, and phosphine oxides (for example, 2,4,6-trimethylbenzoyldiphenylphosphine oxide, etc.). These photopolymerization initiators may be used alone or in combination of two or more.

[0079] The content of the photopolymerization initiator (C) is preferably 0.01 to 20 mass % and more preferably 0.01 to 5 mass % based on the solid content of the color layer-forming composition. If the content of the photopolymerization initiator (C) is less than the above lower limit, curability will be insufficient. If the content of the photopolymerization initiator (C) is more than the above upper limit, unreacted photopolymerization initiator (C) will remain, deteriorating reliability such as heat resistance.

[0080] <Solvent (D)> Examples of the solvent (D) include ethers, ketones, esters, and cellosolves. Examples of ethers include dibutyl ether, dimethoxymethane, dimethoxyethane, diethoxyethane, propylene oxide, 1,4-dioxane, 1,3-dioxolane, 1,3,5-trioxane, tetrahydrofuran, anisole, and phenetole. Examples of ketones include acetone, methyl ethyl ketone, diethyl ketone, dipropyl ketone, diisobutyl ketone, methyl isobutyl ketone, cyclopentanone, cyclohexanone, methylcyclohexanone, and ethylcyclohexanone. Examples of esters include ethyl formate, propyl formate, n-pentyl formate, methyl acetate, ethyl acetate, methyl propionate, ethyl propionate, n-pentyl acetate, and γ-butyrolactone. Examples of cellosolves include methyl cellosolve, cellosolve (ethyl cellosolve), butyl cellosolve, cellosolve acetate, etc. The solvent (D) may be used alone or in combination of two or more kinds.

[0081] The content of the solvent (D) is preferably 20 to 80 mass %, more preferably 30 to 70 mass %, based on the total mass of the composition for forming a colored layer. When the content of the solvent (D) is equal to or greater than the lower limit, the handleability of the composition for forming a colored layer can be further improved. When the content of the solvent (D) is equal to or less than the upper limit, the time required to form the colored layer can be shortened.

[0082] <Additive (E)> The additive (E) may be one or more selected from radical scavengers, peroxide decomposers, and singlet oxygen quenchers. Examples of radical scavengers include hindered amine light stabilizers such as 4-isopropylaminodiphenylamine, N-phenyl-1-naphthylamine, and 1,2,2,6,6-pentamethyl-4-piperidyl methacrylate, and phenolic antioxidants such as 2,6-di-t-butyl-p-cresol and 6,6'-di-t-butyl-4,4'-butylidene-m-cresol. Examples of peroxide decomposers include sulfur-based antioxidants such as ditridecyl-3,3′-thiodipropionate, 2-mercaptobenzothiazole, and 2-mercaptobenzimidazole, and phosphite-based antioxidants such as tris(nonylphenyl)phosphite and 2-ethylhexyldiphenylphosphite. Singlet oxygen quenchers include, for example, transition metal complexes of dialkylphosphates, dialkyldithiocarbanates, benzenedithiol, or similar dithiols. The additive (E) may be used alone or in combination of two or more kinds.

[0083] The additive (E) may also contain other additives such as a leveling agent, an antifoaming agent, an antioxidant, an ultraviolet absorber, a light stabilizer, a photosensitizer, and a conductive material.

[0084] The content of additive (E) is preferably 0.1 to 20 mass % and more preferably 0.1 to 15 mass % based on the solid content of the colored layer-forming composition. If the content of additive (E) is less than the above lower limit, the effect of inhibiting fading of the dye (A) in terms of light resistance and heat resistance is not achieved. If the content of additive (E) is more than the above upper limit, insufficient curing is likely to occur due to curing inhibition by additive (E) or a decrease in the curing components.

[0085] Although the coloring material contained in the coloring layer 30 has an excellent color correction function, it does not have sufficient resistance to light, particularly ultraviolet light, and therefore deteriorates over time when irradiated with ultraviolet light, and is no longer able to absorb light near the maximum absorption wavelength. When the optical film 1 of this embodiment is attached to a display device as described above, external light containing ultraviolet light that enters the display screen passes through the substrate 10 and then enters the colored layer 30. Because the substrate 10 has a high ultraviolet shielding rate, most of the ultraviolet light contained in the external light does not pass through the substrate 10 and does not reach the colored layer 30. This makes it difficult for the color material contained in the colored layer 30 to deteriorate, allowing the color correction function to be maintained for a long period of time.

[0086] The optical film 1 can be produced by forming the optical functional layer 20 on the first surface 10a of the substrate 10 and forming the colored layer 30 on the second surface 10b. The hard coat layer 21, the low refractive index layer 22, and the colored layer 30 can be formed, for example, by applying and drying a coating liquid containing the constituent materials of each layer. The low refractive index layer 22 can also be formed, for example, by vapor deposition or sputtering. Either the optical function layer 20 or the colored layer 30 may be formed first.

[0087] The hard coat layer 21 can be easily formed by using an energy ray-curable compound such as an ultraviolet curable resin. In this case, the hard coat layer 21 can be formed by applying a coating liquid containing an energy ray-curable compound, a polymerization initiator, and an ultraviolet absorber, and irradiating the coating with the corresponding energy rays. When an ultraviolet curable resin is used, as described above, it is preferable that the absorption wavelength range in the ultraviolet region of the photopolymerization initiator and the absorption wavelength range in the ultraviolet region of the ultraviolet absorber are different.

[0088] The optical film 1 can be disposed as a color correction filter inside a display device such as a display, with the colored layer 30 facing the light source. When light emitted from a light source passes through the colored layer 30, wavelength components near the maximum absorption wavelength of the color material contained therein are absorbed. This improves the color purity of the display device. Furthermore, unlike color filters, the color material concentration does not need to be very high, so color purity can be improved without excessively reducing the brightness of the display device.

[0089] Although the coloring material contained in the coloring layer 30 has an excellent color correction function, it does not have sufficient resistance to light, particularly ultraviolet light, and therefore deteriorates over time when irradiated with ultraviolet light, and is no longer able to absorb light near the maximum absorption wavelength. When the optical film 1 of this embodiment is attached to a display device as described above, external light containing ultraviolet rays that enters the display screen passes through the substrate 10 and then enters the colored layer 30. Because the substrate 10 has a high ultraviolet ray blocking rate, most of the ultraviolet rays contained in the external light do not pass through the substrate 10 and do not reach the colored layer 30. This allows the optical film 1 to pass the light resistance test (xenon lamp illuminance 60 W / cm 2 ) specified in the present specification. 2 (300-400 nm, 120 hours of irradiation at 45°C and 50% RH in the test chamber) is calculated by the following formula (1): ΔE*ab≦5 Formula (1) In other words, the color material contained in the color layer 30 is less likely to deteriorate, and the color correction function can be maintained for a long period of time.

[0090] A second embodiment of the present invention will be described with reference to Fig. 2. In the following description, components common to those already described will be assigned the same reference numerals and redundant description will be omitted.

[0091] 2 is a schematic cross-sectional view showing the layer structure of an optical film 1A of this embodiment. The optical film 1A includes a transparent substrate 10, an optical functional layer 20 formed on a first surface 10a of the substrate 10, and a colored layer 30 formed on a second surface 10b of the substrate 10. The optical film 1A includes an anti-glare layer (AG layer) 23 as the optical functional layer 20.

[0092] The antiglare layer 23 has fine irregularities on its surface, and the irregularities scatter external light, thereby reducing the glare of external light. The antiglare layer 23 can be formed by applying and curing a composition for forming an antiglare layer, which contains an active energy ray-curable resin and, as necessary, organic fine particles and / or inorganic fine particles. The active energy ray-curable resin used in the composition for forming an antiglare layer can be the same as that described for the hard coat layer 21. The film thickness of the antiglare layer 23 is not particularly limited, but is preferably 1 to 10 μm.

[0093] The organic fine particles used in the composition for forming the antiglare layer are a material that mainly forms fine irregularities on the surface of the antiglare layer 23 and provides the function of diffusing external light. As the organic fine particles, resin particles made of a light-transmitting resin material such as acrylic resin, polystyrene resin, styrene-(meth)acrylic acid ester copolymer, polyethylene resin, epoxy resin, silicone resin, polyvinylidene fluoride, or polyethylene fluoride resin can be used. In order to adjust the refractive index or dispersibility of the resin particles, two or more types of resin particles made of different materials (refractive indexes) may be mixed and used.

[0094] The inorganic fine particles used in the antiglare layer-forming composition are primarily materials for controlling the sedimentation and aggregation of organic fine particles in the antiglare layer 23. Examples of inorganic fine particles that can be used include silica fine particles, metal oxide fine particles, and various mineral fine particles. Examples of silica fine particles that can be used include colloidal silica and silica fine particles surface-modified with reactive functional groups such as (meth)acryloyl groups. Examples of metal oxide fine particles that can be used include alumina, zinc oxide, tin oxide, antimony oxide, indium oxide, titania, and zirconia. Examples of mineral fine particles that can be used include mica, synthetic mica, vermiculite, montmorillonite, iron-montmorillonite, bentonite, beidellite, saponite, hectorite, stevensite, nontronite, magadiite, ilealite, kanemite, layered titanic acid, smectite, and synthetic smectite. The mineral fine particles may be natural or synthetic (including substituted or derivative) materials, or a mixture of both. Among mineral fine particles, layered organic clay is more preferred. Layered organic clay refers to a swelling clay in which organic onium ions are introduced between the layers. The organic onium ions are not limited as long as they can be organized by utilizing the cation exchange properties of the swelling clay. When a layered organic clay mineral is used as the mineral fine particles, the above-mentioned synthetic smectite can be preferably used. Synthetic smectite has the function of increasing the viscosity of the coating liquid for forming the antiglare layer, suppressing the sedimentation of resin particles and inorganic fine particles, and adjusting the uneven shape of the surface of the optical functional layer.

[0095] The composition for forming the antiglare layer may contain any of silicon oxide, a fluorine-containing silane compound, a fluoroalkylsilazane, a fluoroalkylsilane, a fluorine-containing silicon-based compound, and a perfluoropolyether group-containing silane coupling agent. These materials can impart water repellency and / or oil repellency to the antiglare layer 23, thereby improving the antifouling properties.

[0096] The antiglare layer 23 may be formed by unevenly distributing the material, so that a layer with a relatively high refractive index and a layer with a relatively low refractive index are laminated in this order from the colored layer 30 side. The antiglare layer 23 with unevenly distributed material can be formed, for example, by coating a composition containing a low refractive index material containing surface-modified silica microparticles or hollow silica microparticles and a high refractive index material, and then phase-separating the material by utilizing the difference in surface free energy between the two layers. When the antiglare layer 23 is composed of two phase-separated layers, it is preferable that the layer with the relatively high refractive index on the colored layer 30 side has a refractive index of 1.50 to 2.40, and the layer with the relatively low refractive index on the surface side of the optical film 1A has a refractive index of 1.20 to 1.55.

[0097] The optical film 1A can be produced by forming an antiglare layer 23 on the first surface 10a of the substrate 10, and then forming a colored layer 30 on the second surface 10b of the substrate 10. The antiglare layer 23 can be formed, for example, by applying a coating liquid containing the constituent materials of each layer and drying it.

[0098] A third embodiment of the present invention will be described with reference to FIG. 3 is a schematic cross-sectional view showing the layer structure of an optical film 1B of this embodiment. The optical film 1B includes a transparent substrate 10, an optical functional layer 20 formed on the first surface 10a of the substrate 10, and a colored layer 30 formed on the second surface 10b of the substrate 10. The optical functional layer 20 of the optical film 1B includes an antiglare layer 23 and a low refractive index layer 22 formed on the antiglare layer 23.

[0099] The optical film 1B can be produced by forming an antiglare layer 23 on the first surface 10a of the substrate 10, sequentially forming a low refractive index layer 22 on the antiglare layer 23, and forming a colored layer 30 on the second surface 10b of the substrate 10.

[0100] A fourth embodiment of the present invention will be described with reference to FIG. 4 is a schematic cross-sectional view showing the layer structure of an optical film 1C of this embodiment. The optical film 1C includes a transparent substrate 10, an optical functional layer 20 formed on the first surface 10a of the substrate 10, and a colored layer 30 formed on the second surface 10b of the substrate 10. The optical functional layer 20 of the optical film 1C includes an oxygen barrier layer 40, a hard coat layer 21 formed on the oxygen barrier layer 40, and a low refractive index layer 22 formed on the hard coat layer 21.

[0101] The oxygen barrier layer 40 is a transparent layer having optical transparency, and has an oxygen permeability of 10 cc / m 2 ·day·atm or less, and 5cc / (m 2 ·day·atm) or less is more preferable, and 1cc / (m 2 It is more preferable that the oxygen barrier layer 40 has a pressure of 1000 kJ / cm 3 / day·atm or less. The material for forming the oxygen barrier layer 40 preferably contains polyvinyl alcohol (PVA), ethylene-vinyl alcohol copolymer (EVOH), vinylidene chloride, siloxane resin, etc., and examples of materials that can be used include Maxieve (registered trademark) manufactured by Mitsubishi Gas Chemical Company, Inc., EVAL manufactured by Kuraray Co., Ltd., and Saran Latex and Saran Resin manufactured by Asahi Kasei Corporation. There are no particular limitations on the thickness of the oxygen barrier layer 40, and it is sufficient that the thickness be such that the desired oxygen barrier properties are obtained.

[0102] Furthermore, inorganic particles (particles made of an inorganic compound) may be dispersed in the oxygen barrier layer 40. The inorganic particles can further reduce oxygen permeability and further suppress oxidative deterioration (fading) of the colored layer 30. The size and content of the inorganic particles are not particularly limited and may be appropriately set depending on the thickness of the oxygen barrier layer 40, etc. The size (maximum length) of the inorganic particles dispersed in the oxygen barrier layer 40 is preferably less than the thickness of the oxygen barrier layer 40, and the smaller the size, the more advantageous it is. The size of the inorganic particles dispersed in the oxygen barrier layer 40 may be uniform or non-uniform. Specific examples of inorganic particles dispersed in the oxygen barrier layer 40 include silica particles, alumina particles, silver particles, copper particles, titanium particles, zirconia particles, and tin particles.

[0103] The oxygen barrier layer 40 may be laminated on the viewer's side above the colored layer 30. In the optical films 1A and 1B according to the second and third embodiments, an oxygen barrier layer may be further provided between the substrate 10 and the antiglare layer 23. In the optical film 1B according to the third embodiment, an oxygen barrier layer may be further provided between the antiglare layer 23 and the low refractive index layer 22. By providing an oxygen barrier layer, discoloration due to oxidation of the dye can be further suppressed, as in the fourth embodiment.

[0104] The optical film 1C can be produced by forming the oxygen barrier layer 40 on the first surface 10a of the substrate 10, and then forming the hard coat layer 21 and the low refractive index layer 22 on the oxygen barrier layer 40 in that order.

[0105] When the optical film 1C is attached to a display device as described above, oxygen contained in the outside air does not reach the colored layer unless it passes through the oxygen barrier layer 40. This prevents the color material from being deteriorated by oxygen in the outside air, and the color correction function lasts for a long time.

[0106] In this embodiment, the number and positions of the oxygen barrier layers 40 can be set as appropriate. For example, a separate oxygen barrier layer may be provided between the colored layer and the substrate, and the substrate 10 may be sandwiched between the oxygen barrier layers.

[0107] In the present invention, the configuration of the optical functional layer is not limited to the above. For example, an antireflection layer formed by combining a plurality of low refractive index layers and a plurality of high refractive index layers is also an example of the optical functional layer in the present invention. [Example]

[0108] The optical film according to the present invention will be further described with reference to examples and comparative examples, but the present invention is not limited to the specific contents of the following examples.

[0109] (Examples 1 to 11, Comparative Examples 1 to 9) In the above examples and comparative examples, optical films A to T were prepared with the layer structures shown in Tables 1 and 2, and the properties of the prepared films and the display device properties in organic EL panels were evaluated by simulation. In the tables, "-" indicates that the corresponding layer was not present.

[0110] [Table 1]

[0111] [Table 2]

[0112] <Production of optical film> The method for forming each layer will be described below.

[0113] The following substrates were used: Triacetyl cellulose (TAC) film (FUJIFILM Corporation, TG60UL, substrate thickness 60 μm, UV blocking rate 92.9%).

[0114] [Formation of colored layer] (Materials used for colored layer forming composition) The materials used in the colored layer-forming composition used to form the colored layer were as follows. The absorption maximum wavelength, half-value width, and minimum transmittance wavelength within the specified wavelength range of the coloring material are characteristic values of the cured coating film.

[0115] <Dye (A)> · First coloring material Dye-1 Pyromethene cobalt complex dye (maximum absorption wavelength 493 nm, half-value width 26 nm) · Second coloring material: Dye-2: Tetraazaporphyrin copper complex dye (manufactured by Yamamoto Kasei Co., Ltd., PD-311S, absorption maximum wavelength 586 nm, half-value width 22 nm). Dye-3 Tetraazaporphyrin copper complex dye (FDG-007 manufactured by Yamada Chemical Industry Co., Ltd., maximum absorption wavelength 595 nm, half-value width 22 nm) · Third coloring material: Dye-4 Phthalocyanine copper complex dye (FDN-002 manufactured by Yamada Chemical Co., minimum transmittance wavelength 780 nm at 400 - 780 nm) · Coloring materials other than the first to third coloring materials Dye-5: Dye (manufactured by Yamada Chemical Industry Co., Ltd., FDG-0, maximum absorption wavelength 545 nm, half-value width 79 nm) Dye-6: Dye (manufactured by Yamada Chemical Industry Co., Ltd., FDG-XX, maximum absorption wavelength XX nm, half-value width XX nm)

[0116] <Production example of Dye-1> Ethyl 5-formyl-2,4-dimethyl-1H-pyrrole-3-carboxylate (2.5 g) was sealed in a reaction vessel, dissolved in methanol (50 mL), and then 47% hydrobromic acid (45 g) was added, followed by reflux for 1 hour. The precipitated solid was filtered off to obtain 3,3',5,5'-tetramethyl-4,4'-di-ethoxycarbonyl-2,2'-dipyrromethene hydrobromide (2.6 g). 3,3',5,5'-Tetramethyl-4,4'-di-ethoxycarbonyl-2,2'-dipyrromethene hydrobromide (0.6 g) was sealed in a reaction vessel, and methanol (5 mL), triethylamine (0.17 g), and cobalt acetate tetrahydrate (0.18 g) were added, followed by reflux for 2 hours. The precipitated solid was filtered off to obtain Dye-1 (0.42 g).

[0117] <Active energy ray curable resin (B)> Resin (1): R of the above formula (1) 1 is CH3, R 2 A resin with an amine structure (molecular weight 120,000) in which is CH3 and X is a single bond. Resin (2): R of the above formula (2) 3 is CH3, R 4 A resin with a phenol structure (molecular weight 51,500) in which is H and X is a single bond. UA-306H: Pentaerythritol triacrylate hexamethylene diisocyanate urethane prepolymer (Kyoeisha Chemical Co., Ltd., UA-306H). · DPHA: Dipentaerythritol hexaacrylate. ·PETA: Pentaerythritol triacrylate.

[0118] <Production example of resin (1)> 2.4 g of 1,2,2,6,6-pentamethyl-4-piperidyl methacrylate (Showa Denko Materials, FA-711MM), 5.6 g of methyl methacrylate (Kanto Chemical), 31 g of cyclohexanone (Kanto Chemical), and 0.11 g of 2,2'-azobis(isobutyronitrile) (Fujifilm Wako Pure Chemical Industries, Ltd.) were placed in a reaction vessel and heated and stirred at 70°C for 8 hours under a nitrogen gas atmosphere. The mixture was then heated and stirred at 100°C for 1 hour to obtain a polymer solution. This polymer solution was poured into 400 mL of methanol (Kanto Chemical), and the resulting precipitate was filtered and dried to obtain Resin 1, a copolymer of 1,2,2,6,6-pentamethyl-4-piperidyl methacrylate and methyl methacrylate in a ratio of 15:85 [mol%].

[0119] <Production example of resin (2)> 2.4 g of 4-hydroxyphenyl methacrylate (Showa Denko K.K., Shounol ARP-029P), 5.6 g of methyl methacrylate (Kanto Chemical Co., Ltd.), 32 g of cyclohexanone (Kanto Chemical Co., Ltd.), and 0.11 g of 2,2'-azobis(isobutyronitrile) (Fujifilm Wako Pure Chemical Industries, Ltd.) were placed in a reaction vessel and heated with stirring at 70°C for 8 hours under a nitrogen gas atmosphere. The mixture was then heated with stirring at 100°C for 1 hour to obtain a polymer solution. This polymer solution was poured into 400 mL of methanol (Kanto Chemical Co., Ltd.), and the resulting precipitate was filtered and dried to obtain Resin 2, a copolymer of 4-hydroxyphenyl methacrylate and methyl methacrylate in a ratio of 19:81 [mol %].

[0120] By heating and stirring for an additional hour at 100°C, the initiator 2,2'-azobis(isobutyronitrile) can be completely decomposed, and deterioration of the optical film due to residual initiator can be suppressed. Furthermore, by pouring the polymer solution into methanol, unreacted monomers, polymerization solvents, decomposition products of the initiator, etc. can be removed, and deterioration of the optical film can be suppressed.

[0121] <Photopolymerization initiator (C)> Acylphosphine oxide photopolymerization initiator: Omnirad TPO (manufactured by IGM Resins BV) was used. <Solvent (D)> A suitable mixture of methyl ethyl ketone and methyl acetate was used. <Additive (E)> Singlet oxygen (1O2) quencher: bis(dibutyldithiocarbamate)nickel(II), (Tokyo Chemical Industry Co., Ltd. D1781) Low molecular weight hindered amine light stabilizer (HALS): Tinuvin® 249 (molecular weight 482) manufactured by BASF Japan Ltd. UV absorber: (BASF Japan Ltd., Tinuvin® 479 (hydroxyphenyltriazine))

[0122] (Formation of colored layer) A colored layer-forming composition shown in Table 3 was applied to one surface of the substrate and dried in an oven at 80°C for 60 seconds. Thereafter, an ultraviolet irradiation device was used to apply an irradiation dose of 150 mJ / cm 2 The coating film was cured by irradiating it with ultraviolet light from a light source H bulb (manufactured by Fusion UV Systems Japan Co., Ltd.), to form colored layers 1 to 15. The amounts added are by mass ratio (mass %). In the table, "-" indicates that the component is not contained.

[0123] [Table 3]

[0124] [Functional layer formation: oxygen barrier layer] (Oxygen barrier layer forming composition) Polyvinyl alcohol (PVA) resin for binder, Kuraray Poval (registered trademark) PVA-117 (manufactured by Kuraray Co., Ltd.) 80% by mass aqueous solution.

[0125] (Oxygen barrier layer formation) The oxygen barrier layer-forming composition was applied to the transparent substrate of Example 9 shown in Table 1, dried, and the oxygen permeability was adjusted to 1 cm 3 / (m 2 An oxygen barrier layer with a tensile strength of 1000 kJ / cm² was formed.

[0126] [Formation of functional layer: hard coat layer] (Materials used in the composition for forming the hard coat layer) The following materials were used as the hard coat layer-forming composition used to form the hard coat layer. Active energy ray curable resin UA-306H: Pentaerythritol triacrylate hexamethylene diisocyanate urethane prepolymer (Kyoeisha Chemical Co., Ltd., UA-306H). DPHA: Dipentaerythritol hexaacrylate. PETA: Pentaerythritol triacrylate. Photopolymerization initiator Omnirad TPO: Acylphosphine oxide photopolymerization initiator (manufactured by IGM Resins BV). Additives (ultraviolet (UV) absorbers) Tinuvin 479: hydroxyphenyltriazine-based ultraviolet absorber, Tinuvin (registered trademark) 479 (manufactured by BASF Japan Ltd.). LA-36: Benzotriazole-based ultraviolet absorber, Adekastab (registered trademark) LA-36 (manufactured by ADEKA Corporation). ·solvent MEK: methyl ethyl ketone. Methyl acetate

[0127] (Formation of hard coat layer) A composition for forming a hard coat layer shown in Table 4 was applied onto a transparent substrate, an oxygen barrier layer, or a colored layer shown in Table 1 or Table 2, and dried in an oven at 80°C for 60 seconds. Thereafter, an ultraviolet irradiation device was used to apply an irradiation dose of 150 mJ / cm. 2 The coating was cured by irradiating it with ultraviolet light using a light source H bulb (manufactured by Fusion UV Systems Japan Co., Ltd.), forming a hard coat layer with a thickness of 5.0 μm after curing. The amounts added are by mass (% by mass). In the table, "-" indicates that the component is not contained.

[0128] [Table 4]

[0129] [Formation of functional layer: anti-glare layer] (Composition for forming anti-glare layer) The following composition for forming an antiglare layer was used to form the antiglare layer. Active energy ray curable resin Pentaerythritol triacrylate, Light Acrylate PE-3A (manufactured by Kyoeisha Chemical Co., Ltd., refractive index 1.52) 43.7 parts by mass. Photopolymerization initiator Omnirad TPO (manufactured by IGM Resins BV) 4.55 parts by mass. Resin particles 0.5 parts by mass of styrene-methyl methacrylate copolymer particles (refractive index 1.515, average particle size 2.0 μm). ·Inorganic fine particles 0.25 parts by mass of synthetic sucmetite. Alumina nanoparticles (average particle size 40 nm) 1.0 parts by mass. ·solvent Toluene 15 parts by mass. Isopropyl alcohol 35 parts by weight.

[0130] The antiglare layer-forming composition was applied to a transparent substrate shown in Table 1 and dried in an oven at 80°C for 60 seconds. Thereafter, an ultraviolet irradiation device was used to apply the antiglare layer-forming composition to the transparent substrate at a dose of 150 mJ / cm. 2 The coating film was cured by irradiating it with ultraviolet light (H bulb light source, manufactured by Fusion UV Systems Japan Co., Ltd.), to form an antiglare layer having a thickness of 5.0 μm after curing.

[0131] [Formation of functional layer: low refractive index layer] (Composition for forming low refractive index layer) The following composition for forming a low refractive index layer was used to form the low refractive index layer. Refractive index adjuster: Porous silica microparticle dispersion (average particle diameter 75 nm, solid content 20%, solvent methyl isobutyl ether) ketone) 8.5 parts by mass Antifouling agent: Optool AR-110 (manufactured by Daikin Industries, Ltd., solid content 15%, solvent methyl isobutyl ketone) 5.6 parts by mass Active energy ray curing resin: Pentaerythritol triacrylate 0.4 parts by mass Initiator: Omnirad 184 (manufactured by IGM Resins BV) 0.07 parts by mass Leveling agent: RS-77 (manufactured by DIC) 1.7 parts by mass ·solvent: Methyl isobutyl ketone 83.73 parts by mass

[0132] (Formation of low refractive index layer) The composition for forming a low refractive index layer having the above composition was applied to the hard coat layer or antiglare layer shown in Table 1 or Table 2, dried in an oven at 80°C for 60 seconds, and then irradiated with an ultraviolet ray irradiation device (manufactured by Fusion UV Systems Japan, light source H bulb) at an irradiation dose of 200 mJ / cm. 2 The coating was cured by irradiating it with ultraviolet light at 1000 rpm to form a low refractive index layer having a thickness of 100 nm after curing.

[0133] [Film characteristic evaluation] The optical film of each example was evaluated as follows. (UV blocking rate of layers above the colored layer) When a transparent substrate was placed above the colored layer, the transmittance of the substrate was measured using an automatic spectrophotometer (U-4100, manufactured by Hitachi, Ltd.). When the colored layer was placed above the substrate, the layer above the colored layer was peeled off using transparent pressure-sensitive adhesive tape conforming to JIS-K5600-5-6:1999 Adhesion Test, and the transmittance of the layer above the colored layer was measured using an automatic spectrophotometer (U-4100, manufactured by Hitachi, Ltd.) with the adhesive tape as a reference. Using these transmittances, the average transmittance [%] in the ultraviolet range (290 nm to 400 nm) was calculated, and the UV blocking rate [%] was calculated by subtracting the average transmittance [%] in the ultraviolet range (290 nm to 400 nm) from 100%. (Lightfastness test) A xenon weather meter tester (X75, manufactured by Suga Test Instruments Co., Ltd.) was used, and the xenon lamp illuminance was 60W / cm. 2 The test was conducted for 120 hours at a wavelength of 45°C (300-400 nm) and a humidity of 50% RH inside the tester. Before and after the test, transmittance was measured using an automatic spectrophotometer (Hitachi, Ltd., U-4100). The difference in transmittance ΔT before and after the test was calculated at the wavelength λ that showed the smallest transmittance before the test within the first to third ranges mentioned above. A transmittance difference closer to zero is better. (Heat resistance test) The optical film according to each example was stored at 90°C for 500 hours. Before and after storage, transmittance was measured using an automatic spectrophotometer (U-4100), and the transmittance difference ΔT before and after storage was calculated at the wavelength λ that showed the smallest transmittance before storage within the first to third ranges described above. A transmittance difference closer to zero is better.

[0134] [Display device characteristic evaluation] The display device characteristics of the display devices using the obtained optical films C, F, G, and Q to T were evaluated by simulation as follows. In the simulation, the display device was configured such that the optical film was bonded to an organic EL display device (subject). In an organic EL display device to which the optical film is bonded, white display has a spectrum as shown in FIG. 6, and red, green, and blue displays have individual spectra as shown in FIG.

[0135] (White display characteristics) The transmittance of the obtained optical film was measured using an automatic spectrophotometer (U-4100, manufactured by Hitachi, Ltd.), and the transmittance of this optical film was multiplied by the single spectrum of the organic EL display device when displaying white without the optical film, as shown in Figure 6, to calculate the single spectrum after transmission through the optical film. The single spectrum of the organic EL display device when displaying white and the single spectrum of the optical film after transmission through the optical film were each multiplied by the relative luminous efficiency to calculate a Y value, and the ratio of the Y value obtained from the single spectrum of the organic EL display device when displaying white to 100 was used as an index of the transmission characteristics of the display device, and this was evaluated.

[0136] (color reproducibility) The transmittance of the obtained optical film was measured using an automatic spectrophotometer (U-4100, manufactured by Hitachi, Ltd.), and the chromaticity (x, y) of each of the red, green, and blue monochromatic colors in the CIE (Commission international de l'eclairage) 1931 color system after passing through the optical film was calculated by multiplying the transmittance of the optical film by the individual spectra of the red, green, and blue display of the organic EL display device without the optical film, as shown in Figure 7. Next, the triangle obtained by connecting the chromaticities of the resulting single colors red, green, and blue was compared with the triangle connecting the three primary colors of DCI-P3 proposed by DCI (Digital Cinema Initiatives): red (x=0.680, y=0.320), green (x=0.265, y=0.690), and blue (x=0.150, y=0.060). The overlapping area was calculated to calculate the coverage rate of each standard, which was then evaluated as an index of color reproducibility.

[0137] As evaluations of the optical film properties of the optical films A to P shown in Tables 1 and 2, the results of the ultraviolet ray blocking rate of the layer above the colored layer, the light resistance test, and the heat resistance test are shown in Tables 5 and 6, and as evaluations of the properties of the display devices using the optical films C, F, G, and Q to T, the white display properties and color reproducibility are shown in Table 7.

[0138] [Table 5]

[0139] [Table 6]

[0140] [Table 7]

[0141] The results in Tables 5 and 6 show that optical films (Examples 1 to 10) having a colored layer made using a colored layer-forming composition containing the dye (A), active energy ray-curable resin (B), photopolymerization initiator (C), and solvent (D) of the present invention have excellent light resistance and heat resistance. Optical films having a colored layer made using a colored layer-forming composition to which a singlet oxygen quencher was further added as additive (E) exhibited even better light resistance. Furthermore, when a transparent substrate or functional layer with a UV absorption capacity of 85% or more was provided on the colored layer of the optical film, light resistance was significantly improved compared to when UV absorption capacity was provided within the colored layer. Furthermore, when an oxygen barrier layer was provided on the colored layer of the present invention, light resistance was further improved.

[0142] Furthermore, the results in Table 7 show that display devices 1, 2, and 3 equipped with optical films according to the examples of the present invention had superior color reproducibility compared to display device 4, which applied an optical film having no colored layer. Furthermore, compared to display device 5, which applied an optical film having a colored layer whose transmittance was less than 50% in two of the first to third ranges, the white display characteristics were significantly improved, and the balance with color reproducibility was excellent. Furthermore, compared to the display device 6 employing an optical film having a colored layer whose absorption wavelength band is different from that of the present invention, the balance between white display characteristics and color reproducibility was excellent.

[0143] The present invention has been described above using embodiments and examples, but the specific configuration is not limited to these embodiments, and configuration changes and combinations within the scope that do not deviate from the gist of the present invention are also included.

[0144] For example, the antiglare layer may be provided with ultraviolet absorbing properties to further enhance light resistance.

[0145] The functional layer may include an antifouling layer. The antifouling layer enhances antifouling properties by imparting water repellency and / or oil repellency. Examples of the antifouling layer include a layer containing an antifouling agent such as silicon oxide, a fluorine-containing silane compound, a fluoroalkylsilazane, a fluoroalkylsilane, a fluorine-containing silicon compound, or a perfluoropolyether group-containing silane coupling agent. The antifouling layer may be provided on the outermost surface of the functional layer, or the outermost layer of the functional layers described above may be made to function as an antifouling layer by incorporating an antifouling agent therein.

[0146] The functional layer may include an antistatic layer, such as a layer containing metal oxide fine particles such as antimony-doped tin oxide (ATO) or tin-doped indium oxide (ITO), a polymer-type conductive composition, or an antistatic agent such as a quaternary ammonium salt. The antistatic layer may be provided on the outermost surface of the functional layer, or may be provided between the functional layer and the transparent substrate. Alternatively, an antistatic agent may be blended into any of the layers constituting the functional layer to make it function as an antistatic layer. When an antistatic layer is provided, the surface resistance of the optical film is 1.0×10 6 ~1.0×10 12 (Ω / cm). [Industrial Applicability]

[0147] The present invention can be applied to optical films used in display devices. [Explanation of symbols]

[0148] 1, 1A, 1B, 1C Optical Film 10 Base material 10a Front page 10b Second side 20 Optical functional layer 21 Hard coat layer 22 Low refractive index layer 23 Anti-glare layer 30 Colored layer 40 Oxygen barrier layer

Claims

1. The composition contains a dye (A), an active energy ray-curable resin (B), a photopolymerization initiator (C), and a solvent (D), The dye (A) is a first colorant having an absorption maximum wavelength in a first range of 470 to 530 nm and an absorption spectrum half width of 15 to 45 nm; a second colorant having an absorption maximum wavelength in a second range of 560 to 620 nm and an absorption spectrum half width of 15 to 55 nm; a third colorant having the lowest transmittance in a wavelength range of 400 to 780 nm within a third range of 650 nm to 780 nm, the minimum transmittance is 1% or more and less than 50% in only one of the first range, the second range, and the third range; The colored layer-forming composition, wherein the active energy ray-curable resin (B) contains a resin having an amine structure.

2. The active energy ray-curable resin (B) is a polymer containing a structural unit represented by the following formula (1): The colored layer forming composition according to claim 1 . 【Chemical 1】 [In formula (1), R １ represents a hydrogen atom, a halogen atom, a carboxyl group, a sulfo group, a cyano group, a hydroxy group, an alkyl group having 10 or less carbon atoms, an alkoxycarbonyl group having 10 or less carbon atoms, an alkylsulfonylaminocarbonyl group having 10 or less carbon atoms, an arylsulfonylaminocarbonyl group, an alkylsulfonyl group, an arylsulfonyl group, an acylaminosulfonyl group having 10 or less carbon atoms, an alkoxy group having 10 or less carbon atoms, an alkylthio group having 10 or less carbon atoms, an aryloxy group having 10 or less carbon atoms, a nitro group, an alkoxycarbonyloxy group, an aryloxycarbonyloxy group, an acyloxy group having 10 or less carbon atoms, an acyl group having 10 or less carbon atoms, a carbamoyl group, a sulfamoyl group, an aryl group having 10 or less carbon atoms, a substituted amino group, a substituted ureido group, a substituted phosphono group, or a heterocyclic group; R ２ represents a hydrogen atom or an alkyl group having 30 or less carbon atoms, and X represents a single bond, an ester group, an aliphatic alkyl chain having 30 or less carbon atoms, an aromatic chain, a polyethylene glycol chain, or a linking group formed by combining these, any of which may contain a spirodioxane ring.

3. The colored layer forming composition according to claim 1 , wherein the active energy ray-curable resin (B) further contains a polymer containing a structural unit represented by the following formula (2): 【Chemistry 2】 [In formula (2), R ３ represents a hydrogen atom, a halogen atom, a carboxyl group, a sulfo group, a cyano group, a hydroxy group, an alkyl group having 10 or less carbon atoms, an alkoxycarbonyl group having 10 or less carbon atoms, an alkylsulfonylaminocarbonyl group having 10 or less carbon atoms, an arylsulfonylaminocarbonyl group, an alkylsulfonyl group, an arylsulfonyl group, an acylaminosulfonyl group having 10 or less carbon atoms, an alkoxy group having 10 or less carbon atoms, an alkylthio group having 10 or less carbon atoms, an aryloxy group having 10 or less carbon atoms, a nitro group, an alkoxycarbonyloxy group, an aryloxycarbonyloxy group, an acyloxy group having 10 or less carbon atoms, an acyl group having 10 or less carbon atoms, a carbamoyl group, a sulfamoyl group, an aryl group having 10 or less carbon atoms, a substituted amino group, a substituted ureido group, a substituted phosphono group, or a heterocyclic group; R ４ represents a hydrogen atom or an alkyl group having 30 or less carbon atoms, and X represents a single bond, an ester group, an aliphatic alkyl chain having 30 or less carbon atoms, an aromatic chain, a polyethylene glycol chain, or a linking group formed by combining these, any of which may contain a spirodioxane ring.

4. The colored layer-forming composition according to claim 1 , further comprising an additive (E) containing one or more selected from the group consisting of a radical scavenger, a peroxide decomposer, and a singlet oxygen quencher.

5. 5. The colored layer-forming composition according to claim 4, wherein the singlet oxygen quencher is a dialkyl phosphate, a dialkyl dithiocarbamate, or a benzenedithiol, or a transition metal complex thereof.

6. 6. The composition for forming a colored layer according to claim 1, wherein the dye (A) comprises one or more compounds selected from the group consisting of compounds having any of a porphyrin structure, a merocyanine structure, a phthalocyanine structure, an azo structure, a cyanine structure, a squarylium structure, a coumarin structure, a polyene structure, a quinone structure, a tetradiporphyrin structure, a pyrromethene structure, and an indigo structure, and metal complexes thereof.

7. A colored layer that is a cured product of the colored layer-forming composition according to any one of claims 1 to 6; a transparent substrate located on one surface of the colored layer; a functional layer located on one or the other surface of the colored layer, one or both of the transparent substrate and the functional layer have an ultraviolet ray shielding rate of 85% or more as measured in accordance with the method described in JIS L1925; The optical film, wherein the functional layer functions as an anti-reflection layer or an anti-glare layer.

8. The functional layer has an oxygen permeability of 10 cm ３ / (m ２ 8. The optical film according to claim 7, further comprising an oxygen barrier layer having a viscosity of 1000 psi (1000 psi) or less (1000 psi).

9. The optical film according to claim 7 or 8, further comprising an antistatic layer or an antifouling layer as the functional layer.

10. A display device comprising the optical film according to claim 7 .

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