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

Abstract

To provide a colored layer forming composition that allows for improved light resistance and heat resistance, strikes a balance between antireflective property and brightness efficiency, and also enables improved display quality, an extended life of light emitting devices, and improved color reproduction.SOLUTION: A colored layer forming composition contains a dye (A) and an active energy-ray curable resin (B). The dye (A) contains a first colorant and a second colorant. The first colorant has a maximum absorption wavelength of 470-530 nm and a half-width of an absorption spectrum of 15-45 nm, while the second colorant has a maximum absorption wavelength of 560-620 nm and a half-width of the absorption spectrum of 15-55 nm. The active energy-ray curable resin (B) contains a copolymer including a structural unit having any of a (meth)acrylate repeat unit, an olefinic repeat unit, a halogen atom-containing repeat unit, a styrenic repeat unit, a vinyl acetate repeat unit, and a vinyl alcoholic repeat unit.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] Display devices are often used in environments where external light is incident, both indoors and outdoors. External light incident on a display device is reflected by the surface of the display device, causing a deterioration in display quality. Self-emissive display devices, such as organic light-emitting display devices, have the problem that external light is strongly reflected by electrodes and many other metal wirings, which tends to deteriorate display quality. However, they are expected to be next-generation display devices because they have excellent compactness, low power consumption, high brightness, and high response speed.

[0003] In order to solve the problem of deterioration in display quality due to such reflection of external light, there is a configuration in which a polarizing plate and a phase retardation plate are arranged on the display surface side to suppress reflection of external light. However, in the method using a polarizer and a phase retarder, a significant portion of the light emitted from the display device is lost when it passes through the polarizer and the phase retarder and is emitted to the outside, which tends to shorten the life of the element.

[0004] In addition, display devices generally require high color purity. Color purity refers to the range of colors that a display device can display, also known as the color reproduction range. Therefore, high color purity means a wide color reproduction range and good color reproducibility. Known methods for improving color reproducibility include using color filters on a light source that emits white light to separate colors, or using color filters to correct a light source that emits monochromatic light of the three primary colors RGB and narrow the half-value range. However, using color filters to improve the color reproducibility of display devices requires thicker color filters and higher colorant concentrations, which can lead to problems such as poor pixel shape and viewing angle characteristics and reduced display quality. Furthermore, display devices that emit monochromatic light of the three primary colors RGB require a color filter formation process, which increases costs.

[0005] As a display device different from the above-mentioned configurations of arranging polarizing plates and phase retardation plates or configurations using color filters, for example, Patent Document 1 proposes an organic light-emitting display device that includes a display substrate including organic light-emitting elements and an encapsulation substrate spaced apart from the display substrate, and in which a filler that selectively absorbs external light for each wavelength band and adjusts transmittance is filled in the space between the display substrate and the encapsulation substrate. According to the invention of Patent Document 1, external light reflection is suppressed to improve visibility, and light in a wavelength band that particularly reduces color purity among the light emitted from the display device is selectively absorbed, thereby improving color purity. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 5673713 Summary of the Invention [Problem to be solved by the invention]

[0007] However, the dyes having selective absorption properties used in the technology of Patent Document 1 have poor light resistance, heat resistance, etc., and are insufficient as a configuration that ensures reliability. Therefore, unless the reliability is improved, it would be difficult to put them into practical use.

[0008] In consideration of the above circumstances, the present invention provides a composition for forming a colored layer, an optical film, and a display device that can improve light resistance and heat resistance, achieve both reflection suppression and luminance efficiency, improve display quality, extend the life of light-emitting elements, and improve color reproducibility. [Means for solving the problem]

[0009] The present invention has the following aspects.

[0010] [1] A colored layer-forming composition comprising a dye (A), an active energy ray-curable resin (B), a photopolymerization initiator (C), and a solvent (D), wherein the dye (A) comprises a first coloring material and a second coloring material, wherein the first coloring material has an absorption maximum wavelength in the range of 470 to 530 nm and an absorption spectrum half width of 15 to 45 nm, the second coloring material has an absorption maximum wavelength in the range of 560 to 620 nm and an absorption spectrum half width of 15 to 55 nm, and the active energy ray-curable resin (B) comprises a copolymer of a structural unit represented by the following formula (1) and a structural unit having any of a (meth)acrylate-based repeating unit, an olefin-based repeating unit, a halogen atom-containing repeating unit, a styrene-based repeating unit, a vinyl acetate-based repeating unit, and a vinyl alcohol-based repeating unit: [ka] [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.

[0011] [2] The colored layer-forming composition according to [1], wherein the active energy ray-curable resin (B) contains a polymer containing a structural unit represented by the following formula (2): [ka] [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.

[0012] [3] The polymer containing the structural unit represented by formula (2) is a copolymer of the structural unit represented by formula (2) with a structural unit having any one of a (meth)acrylate-based repeating unit, an olefin-based repeating unit, a halogen atom-containing repeating unit, a styrene-based repeating unit, a vinyl acetate-based repeating unit, and a vinyl alcohol-based repeating unit. [2] The colored layer-forming composition according to [2].

[0013] [4] The colored layer-forming composition according to any one of [1] to [3], further comprising one or more additives (E) selected from a radical scavenger, a peroxide decomposer, and a singlet oxygen quencher. [5] The colored layer-forming composition according to [4], wherein the singlet oxygen quencher is a dialkyl phosphate, a dialkyl dithiocarbamate, or a benzenedithiol, or a transition metal complex thereof. [6] The composition for forming a colored layer according to any one of [1] to [5], wherein the dye (A) contains 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] The composition for forming a colored layer according to any one of [1] to [6], wherein the dye (A) further contains a third coloring material whose wavelength having the lowest transmittance in the wavelength range of 380 to 780 nm is in the range of 650 to 780 nm.

[0014] [8] An optical film comprising a colored layer which is a cured product of the colored layer-forming composition according to any one of [1] to [7], 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, wherein one or both of the transparent substrate and the functional layer have an ultraviolet ray blocking rate of 85% or more as measured in accordance with the method described in JIS L1925, and the functional layer functions as an anti-reflection layer or an anti-glare layer. [9] The functional layer has an oxygen permeability of 10 cm 3 / (m 2 The optical film according to [8], further comprising an oxygen barrier layer having an oxygen barrier strength of 100 psi (100 psi) or less.

[10] The optical film according to [8] or [9], further comprising an antistatic layer or an antifouling layer as the functional layer.

[0015]

[11] A display device comprising the optical film according to any one of [8] to

[10] . [Effects of the Invention]

[0016] According to the present invention, it is possible to provide a colored layer-forming composition, an optical film, and a display device that can improve light resistance and heat resistance, achieve both reflection suppression and luminance efficiency, improve display quality, extend the life of light-emitting elements, and improve color reproducibility. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a cross-sectional view of an optical film according to one embodiment of the present invention. [Figure 2] FIG. 2 is a cross-sectional view of an optical film according to another embodiment of the present invention. [Figure 3] FIG. 2 is a cross-sectional view of an optical film according to another embodiment of the present invention. [Figure 4] FIG. 2 is a cross-sectional view of an optical film according to another embodiment of the present invention. [Figure 5] FIG. 2 is a cross-sectional view of an optical film according to another embodiment of the present invention. [Figure 6] FIG. 2 is a cross-sectional view of an optical film according to another embodiment of the present invention. [Figure 7] FIG. 2 is a cross-sectional view of an optical film according to another embodiment of the present invention. [Figure 8] FIG. 2 is a cross-sectional view of an optical film according to another embodiment of the present invention. [Figure 9] 10 is a graph showing the spectrum of a white display output through an organic EL light source and a color filter in an example. [Figure 10] 10 is a graph showing the spectra of red, green, and blue colors output through an organic EL light source and a color filter in an example. DETAILED DESCRIPTION OF THE INVENTION

[0018] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In all drawings, even if the embodiments are different, the same or corresponding components are designated by the same reference numerals, and common descriptions will be omitted.

[0019] [Optical film] An optical film according to one embodiment of the present invention will be described in detail below with reference to FIG.

[0020] 1, the optical film 1 has a colored layer 10, a transparent substrate 20, and a functional layer 30. The functional layer 30 has a low refractive index layer 31 and a hard coat layer 32. That is, the optical film 1 has the transparent substrate 20 located on one side of the colored layer 10, and is a laminate in which the colored layer 10, the transparent substrate 20, the hard coat layer 32, and the low refractive index layer 31 are laminated in this order.

[0021] The thickness of the optical film 1 is, for example, preferably 10 to 140 μm, more preferably 15 to 120 μm, and even more preferably 20 to 100 μm. When the thickness of the optical film 1 is equal to or greater than the above lower limit, the strength of the optical film 1 can be further increased. When the thickness of the optical film 1 is equal to or less than the above upper limit, the optical film 1 can be made lighter and is advantageous for reducing the thickness of the display device. Each layer constituting the optical film 1 will be described below.

[0022] ≪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).

[0023] 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.

[0024] <Dye (A)> The colorant (A) contains at least a first coloring material and a second coloring material. The first colorant has a maximum absorption wavelength in the range of 470 to 530 nm and a half-width of the absorption spectrum of 15 to 45 nm. If the maximum absorption wavelength is less than the lower limit, the luminance efficiency of blue light emission is likely to decrease, while if it exceeds the 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 lower limit, the suppression effect on the reflectivity to external light is small, and if it exceeds the upper limit, the reflectivity to external light is likely to improve, but the luminance efficiency is likely to decrease.

[0025] The second colorant has a maximum absorption wavelength in the range of 560 to 620 nm and a half-width of the absorption spectrum of 15 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, and if it exceeds the upper limit, the reflectivity to external light is likely to improve, but the luminance efficiency is likely to decrease.

[0026] The colorant (A) may further contain a colorant other than the first colorant and the second colorant, such as a third colorant. The third coloring material has a wavelength in the range of 380 to 780 nm at which the transmittance is lowest in the range of 650 to 780 nm. If the wavelength in the range of 380 to 780 nm at which the third coloring material has the lowest transmittance is below the lower limit, the luminance efficiency of red light emission is likely to decrease, whereas if it exceeds the upper limit, the effect of suppressing the reflectivity to external light is reduced.

[0027] The dye (A) preferably contains a compound 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, or an indigo structure, or a metal complex thereof. In particular, metal complexes having a porphyrin structure, a pyrromethene structure, or a phthalocyanine structure, or compounds having a squarylium structure, are more preferred due to their excellent reliability. The dye (A) may contain one or more of these compounds or metal complexes thereof. These compounds or metal complexes may be contained in the first coloring material, the second coloring material, the third coloring material, or two or more of these coloring materials.

[0028] <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.

[0029] 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.

[0030] In this embodiment, the resin having an amine structure with radical scavenging ability contains a structural unit represented by the following formula (1).

[0031] [ka]

[0032] 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.

[0033] 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.

[0034] In this embodiment, the resin having an amine structure with radical scavenging ability has as its main component (the component with the largest mass %) a copolymer of a structural unit represented by formula (1) and a copolymerization component having any of the repeating units described below. By being a copolymer, the compatibility with other components can be controlled.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] Examples of styrene repeating units 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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].

[0046] 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.

[0047] 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.

[0048] 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 95 mol %, more preferably 10 to 90 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.

[0049] The active energy ray-curable resin (B) may further contain a polymer containing a structural unit represented by the following formula (2).

[0050] [ka]

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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].

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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."

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] <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.

[0070] 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.

[0071] <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.

[0072] 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.

[0073] <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.

[0074] 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.

[0075] 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.

[0076] By containing the colored layer-forming composition of the present invention, the colored layer 10 can improve light resistance and heat resistance, achieve both reflection suppression and brightness efficiency, improve display quality, extend the life of the light-emitting element, and improve color reproducibility.

[0077] ≪Transparent base material≫ The transparent substrate 20 is a sheet-like member that is located on one side of the colored layer 10 and forms the optical film 1. The transparent substrate 20 may be made of a translucent resin film. The transparent substrate 20 may be made of a transparent resin or inorganic glass. Examples of transparent resins include polyolefin, polyester, polyacrylate, polyamide, polyimide, polyarylate, polycarbonate, triacetyl cellulose, polyvinyl alcohol, polyvinyl chloride, cycloolefin copolymer, norbornene-containing resin, polyether sulfone, and polysulfone. Examples of polyolefins include polyethylene and polypropylene. Examples of polyesters include polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate. Examples of polyacrylates include polymethyl methacrylate. Examples of polyamides include nylon 6 and nylon 66. Among these, polyethylene terephthalate films (PET), triacetyl cellulose films (TAC), polymethyl methacrylate films (PMMA), and polyester films other than PET are preferably used. The thickness of the transparent substrate 20 is not particularly limited, but is preferably 10 to 100 μm, for example. The transmittance of the transparent substrate 20 is preferably, for example, 90% or more.

[0078] The transparent substrate 20 may be provided with ultraviolet absorbing ability. By adding an ultraviolet absorbing agent to the resin that is the raw material of the transparent substrate 20, the transparent substrate 20 can be provided with ultraviolet absorbing ability.

[0079] Examples of the ultraviolet absorber include salicylic acid ester-based ultraviolet absorbers, benzophenone-based ultraviolet absorbers, benzotriazole-based ultraviolet absorbers, benzotriazine-based ultraviolet absorbers, and cyanoacrylate-based ultraviolet absorbers. These ultraviolet absorbents may be used alone or in combination of two or more.

[0080] When the transparent substrate 20 is provided with ultraviolet absorbing ability, the ultraviolet ray shielding rate is preferably 85% or more. Here, the ultraviolet ray shielding rate is a value measured in accordance with JIS L1925 and calculated by the following formula (I). UV blocking rate (%) = 100 - average transmittance of UV rays with wavelengths of 290 to 400 nm (%) (I) If the ultraviolet ray blocking rate is less than 85%, the effect of inhibiting fading in the light resistance of the dye (A) will be reduced.

[0081] <Functional Layer> The functional layer 30 is located on one or the other surface of the colored layer 10. By having the functional layer 30, the optical film can exhibit various functions. The functions of the functional layer 30 include an anti-reflection function, an anti-glare function, an oxygen barrier function, an anti-static function, an anti-fouling function, a reinforcement function, an ultraviolet absorbing function (ultraviolet absorbing ability), and the like. The functional layer 30 may be a single layer or multiple layers, and may have one type of function or two or more types of functions.

[0082] When the optical film 1 has an antireflection function, the functional layer 30 functions as an antireflection layer. Examples of the antireflection layer include a hard coat layer 32 and an antiglare layer 34, which will be described later, and a low refractive index layer 31, which has a lower refractive index than the transparent substrate 20. The low refractive index layer 31 can be formed by using a material for the functional layer that has a lower refractive index than the materials of the hard coat layer 32, the antiglare layer 34, and the transparent substrate 20. To adjust the refractive index of the low refractive index layer 31, fine particles such as lithium fluoride (LiF), magnesium fluoride (MgF), sodium hexafluoroaluminum (cryolite, cryolite, 3NaF·AlF3, Na3AlF6), aluminum fluoride (AlF3), or silica fine particles may be blended. The use of porous silica fine particles or hollow silica fine particles having voids inside the particles is effective in lowering the refractive index of the low refractive index layer 31. Furthermore, the composition for forming the low refractive index layer 31 (composition for forming the low refractive index layer) may be blended with a photopolymerization initiator (C), a solvent (D), and an additive (E) as described for the colored layer 10, as appropriate. The refractive index of the low refractive index layer 31 is preferably 1.20 to 1.55. The thickness of the low refractive index layer 31 is not particularly limited, but is preferably, for example, 40 nm to 1 μm.

[0083] When the optical film 1 has an antiglare function, the functional layer 30 functions as an antiglare layer 34. The antiglare layer 34 has fine irregularities on its surface, which scatter external light and reduce glare, improving display quality. When combined with the low refractive index layer 31, the low refractive index layer 31 and the antiglare layer 34 form an antireflection layer. The antiglare layer 34 contains one or more types of particles selected from organic fine particles and inorganic fine particles as needed. The organic fine particles are a material that forms fine irregularities on the surface and provides the function of scattering external light. Examples of the organic fine particles include 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, and polyethylene fluoride resin. Two or more types of resin particles with different materials (refractive indexes) may be mixed and used to adjust the refractive index and dispersibility of the resin particles. Inorganic fine particles are materials that control the sedimentation and aggregation of organic fine particles. 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 (aluminum oxide), zinc oxide, tin oxide, antimony oxide, indium oxide, titania (titanium dioxide), and zirconia (zirconium dioxide). 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. Mineral fine particles can be natural or synthetic (including substituted or derivative) materials, or a mixture of both. Among mineral microparticles, 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 layered organic clay minerals are used as the mineral microparticles, 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 settling of resin particles and inorganic microparticles, and adjusting the uneven shape of the surface of the antiglare layer 34 (functional layer 30).

[0084] When the optical film 1 has an oxygen barrier function, the functional layer 30 functions as an oxygen barrier layer 33. The oxygen permeability of the oxygen barrier layer 33 is 10 cm 3 / (m 2 ·day·atm) or less, and 5cm 3 / (m 2 ·day·atm) or less is preferable, and 1cm 3 / (m 2When the oxygen permeability of the oxygen barrier layer 33 is equal to or less than the above upper limit, a sufficient oxygen barrier function can be imparted to the functional layer 30. The lower limit of the oxygen permeability of the oxygen barrier layer 33 is not particularly limited, and may be 0 cm 3 / (m 2 ·day·atm). The oxygen permeability of the oxygen barrier layer 33 is a value measured using an oxygen permeability measuring device under conditions of 30° C. and a relative humidity of 60%.

[0085] When the optical film 1 has an antistatic function, the functional layer 30 functions as an antistatic layer. Examples of the antistatic layer include a layer containing an antistatic agent such as metal oxide fine particles such as antimony-doped tin oxide (ATO) or tin-doped indium oxide (ITO), a polymer-type conductive composition, or a quaternary ammonium salt. The antistatic layer may be provided on the outermost surface of the functional layer 30, or may be provided between the functional layer 30 and the transparent substrate 20. Alternatively, the antistatic layer may be formed by blending an antistatic agent in any of the layers constituting the functional layer 30. When an antistatic layer is provided, the surface resistance of the optical film is 1.0×10 6 ~1.0×10 12 (Ω / cm).

[0086] When the optical film 1 has an antifouling function, the functional layer 30 functions as an antifouling layer. The antifouling layer enhances the 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 30, or the antifouling layer may be formed by blending an antifouling agent into the layer of the functional layer 30 described above that will be the outermost surface.

[0087] When the optical film 1 has a reinforcing function, the functional layer 30 functions as a reinforcing layer. The reinforcing layer is a layer that increases the strength of the optical film. An example of the reinforcing layer is a hard coat layer 32. An example of the hard coat layer 32 is a layer formed of a hard coat agent containing a monofunctional, difunctional, trifunctional or higher functional (meth)acrylate or urethane (meth)acrylate.

[0088] When the optical film 1 has ultraviolet absorption ability, the functional layer 30 functions as an ultraviolet absorbing layer. Examples of the ultraviolet absorbing layer include a layer containing a triazine-based ultraviolet absorber such as 2-(4,6-diphenyl-1,3,5-triazin-2-yl)-5-hexyloxyphenol, or a benzotriazole-based ultraviolet absorber such as 2-(2H-benzotriazol-2-yl)-4-methylphenol. The content of the ultraviolet absorber is preferably 0.1 to 5 mass % relative to the total mass of the materials forming the ultraviolet absorbing layer. When the content of the ultraviolet absorber is equal to or greater than the above lower limit, sufficient ultraviolet absorption ability can be imparted to the functional layer 30. When the content of the ultraviolet absorber is equal to or less than the above upper limit, insufficient hardness due to a decrease in the curing component can be avoided.

[0089] In the optical film 1, one or both of the transparent substrate 20 and the functional layer 30 have an ultraviolet ray shielding rate of 85% or more, preferably 90% or more, more preferably 95% or more, and may even be 100%. When the ultraviolet ray shielding rate is equal to or greater than the above lower limit, light resistance and heat resistance can be further improved. The ultraviolet ray shielding rate can be measured in accordance with the method described in JIS L1925. The ultraviolet ray blocking rate can be adjusted by imparting ultraviolet ray absorbing ability to either or both of the transparent substrate 20 and the functional layer 30 .

[0090] The thickness of the functional layer 30 is, for example, preferably 0.04 to 25 μm, more preferably 0.1 to 20 μm, and even more preferably 0.2 to 15 μm. When the thickness of the functional layer 30 is equal to or greater than the above lower limit, various functions can be easily imparted to the optical film 1. When the thickness of the functional layer 30 is equal to or less than the above upper limit, it is advantageous for reducing the thickness of the display device.

[0091] [Method of manufacturing optical film] The optical film 1 of this embodiment can be produced by a conventionally known method. For example, the colored layer 10 is obtained by applying a colored layer-forming composition to one surface of the transparent substrate 20 and curing the colored layer-forming composition by irradiating it with active energy rays. The light source for irradiating the active energy rays to cure the colored layer-forming composition and form the colored layer 10 can be any light source that generates active energy rays. The active energy rays can be light energy rays such as radiation (gamma rays, X-rays, etc.), ultraviolet rays, visible light, electron beams (EB), etc., and usually ultraviolet rays and electron beams are used in many cases. For example, lamps that can be used to irradiate ultraviolet rays include low-pressure mercury lamps, medium-pressure mercury lamps, high-pressure mercury lamps, carbon arc lamps, metal halide lamps, xenon lamps, and electrodeless discharge tubes. Regarding irradiation conditions, the ultraviolet irradiation dose is usually 100 to 1000 mJ / cm. 2 is.

[0092] Next, a hard coating agent is applied to the other surface of the transparent substrate 20, and the hard coating agent is cured by irradiating it with active energy rays in the same manner as the colored layer 10, thereby obtaining a hard coating layer 32.

[0093] By forming the low refractive index layer 31 on the hard coat layer 32, an optical film 1 is obtained in which the functional layer 30 is located on the other surface of the transparent substrate 20. There are no limitations on the method for forming the low refractive index layer 31, and methods that can be used include applying a composition for forming a low refractive index layer to the hard coat layer 32 and curing it by irradiating it with active energy rays, vacuum deposition, sputtering, ion plating, ion beam, and plasma vapor deposition.

[0094] [Other embodiments] 2 , the optical film may be an optical film 2 having a transparent substrate 20 located on one side of a colored layer 10, and having the colored layer 10, transparent substrate 20, oxygen barrier layer 33, hard coat layer 32, and low refractive index layer 31 laminated in this order. In the optical film 2, the oxygen barrier layer 33, hard coat layer 32, and low refractive index layer 31 constitute a functional layer 30. The optical film 2 of this embodiment has an oxygen barrier layer 33 and therefore has better oxygen barrier properties than the optical film 1.

[0095] 3, the optical film may be an optical film 3 having a transparent substrate 20 located on one side of a colored layer 10, and having the colored layer 10, transparent substrate 20, and antiglare layer 34 laminated in this order. In the optical film 3, the antiglare layer 34 constitutes a functional layer 30. The optical film 3 of this embodiment has an antiglare layer 34 and is therefore excellent in suppressing reflection.

[0096] 4, the optical film may be an optical film 4 having a transparent substrate 20 located on one side of a colored layer 10, and having the colored layer 10, transparent substrate 20, antiglare layer 34, and low refractive index layer 31 laminated in this order. In the optical film 4, the antiglare layer 34 and low refractive index layer 31 constitute a functional layer 30. The optical film 4 of this embodiment has the low refractive index layer 31 and the antiglare layer 34, and therefore has excellent anti-reflection properties.

[0097] 5 , the optical film may be an optical film 5 having a transparent substrate 20 located on one side of a colored layer 10 and a functional layer 30 located on the other side of the colored layer 10, in which the transparent substrate 20, the colored layer 10, a hard coat layer 32, and a low refractive index layer 31 are laminated in this order. In the optical film 5, the hard coat layer 32 and the low refractive index layer 31 constitute the functional layer 30. The optical film 5 of this embodiment has a colored layer 10 and a functional layer 30 having an ultraviolet absorbing function and an anti-reflection function on one surface of a transparent substrate 20.

[0098] 6 , the optical film may be an optical film 6 having a transparent substrate 20 located on one side of a colored layer 10 and a functional layer 30 located on the other side of the colored layer 10, in which the transparent substrate 20, the colored layer 10, an oxygen barrier layer 33, a hard coat layer 32, and a low refractive index layer 31 are laminated in this order. In the optical film 6, the oxygen barrier layer 33, the hard coat layer 32, and the low refractive index layer 31 constitute the functional layer 30. The optical film 6 of this embodiment has an oxygen barrier layer 33 and therefore has excellent oxygen barrier properties.

[0099] 7, the optical film may be an optical film 7 having a transparent substrate 20 located on one side of the colored layer 10 and a functional layer 30 located on the other side of the colored layer 10, in which the transparent substrate 20, the colored layer 10, and the antiglare layer 34 are laminated in this order. In the optical film 7, the antiglare layer 34 constitutes the functional layer 30. The optical film 7 of this embodiment has an antiglare layer 34 and is therefore excellent in suppressing reflection.

[0100] 8, the optical film may be an optical film 8 having a transparent substrate 20 located on one side of a colored layer 10 and a functional layer 30 located on the other side of the colored layer 10, in which the transparent substrate 20, the colored layer 10, an antiglare layer 34, and a low refractive index layer 31 are laminated in this order. In the optical film 8, the antiglare layer 34 and the low refractive index layer 31 constitute the functional layer 30. The optical film 8 of this embodiment has the low refractive index layer 31 and the antiglare layer 34, and therefore is more excellent in anti-reflection properties.

[0101] [Display device] The display device of the present invention includes the optical film of the present invention. Specific examples of the display device include televisions, monitors, mobile phones, portable game consoles, personal digital assistants, personal computers, electronic books, video cameras, digital still cameras, head-mounted displays, navigation systems, audio playback devices (car audio, digital audio players, etc.), copiers, facsimiles, printers, multi-function printers, vending machines, automated teller machines (ATMs), personal authentication devices, optical communication devices, and IC cards. Among these, the optical film of the present invention is preferably used in display devices including self-luminous elements such as LEDs, organic electroluminescent devices, inorganic phosphors, and quantum dots, which are susceptible to the influence of external light reflection due to metal electrodes and wiring.

[0102] The optical film of the present embodiment has a colored layer containing the colored layer-forming composition of the present invention, and therefore has improved light resistance and heat resistance, and can achieve both reflection suppression and luminance efficiency. Therefore, a display device including the optical film of the present embodiment can improve display quality and extend the life of the light-emitting element.

[0103] Each embodiment of the present invention has been described above in detail with reference to the drawings, but the specific configuration is not limited to this embodiment, and configuration changes, combinations, etc. are also included within the scope that does not deviate from the gist of the present invention.

[0104] For example, the optical film of this embodiment has one colored layer 10, but the number of colored layers may be two or more. In the optical film of this embodiment, the ultraviolet absorbing ability may be imparted to the transparent substrate 20 or to the functional layer 30 such as the hard coat layer 32 . [Example]

[0105] The present invention will be described in more detail below using examples, but the present invention is not limited to these examples.

[0106] [Examples 1 to 8, Comparative Examples 1 to 5] In the following examples and comparative examples, optical films A to M were prepared with the layer structures shown in Tables 1 and 2. The optical film properties and display device properties of the prepared optical films A to M in an organic EL panel were evaluated by simulation. In the tables, "-" indicates that the corresponding layer was not present.

[0107] [Table 1]

[0108] [Table 2]

[0109] <Production of optical film> The method for forming each layer will be described below.

[0110] [Formation of colored layer] (Colored layer forming composition materials used) The materials used in the colored layer-forming composition used to form the colored layer were as follows. The maximum absorption wavelength, half width, and minimum transmittance wavelength in the specified wavelength range of the colorant are characteristic values ​​of the cured coating film.

[0111] <Dye (A)> First colorant Dye-1: Pyrromethene cobalt complex dye represented by the following formula (3) (maximum absorption wavelength: 493 nm, half width: 26 nm). Second colorant Dye-2: Tetraazaporphorin copper complex dye (manufactured by Yamamoto Chemical Industry Co., Ltd., PD-311S, maximum absorption wavelength 586 nm, half-width 22 nm). Dye-3: Tetraazaporphorin copper complex dye (manufactured by Yamada Chemical Co., Ltd., FDG-007, maximum absorption wavelength 595 nm, half-width 22 nm). Third colorant Dye-4: Phthalocyanine copper complex dye (Yamada Chemical Industry Co., Ltd., FDN-002, minimum transmittance wavelength of 780 nm in the range of 400 to 780 nm).

[0112] [ka]

[0113] <Active energy ray curable resin (B)> Resin 1: R of 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 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.

[0114] <Resin 1 manufacturing example> 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%].

[0115] <Resin 2 manufacturing example> 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 %].

[0116] 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.

[0117] <Photopolymerization initiator (C)> Omnirad TPO: Acylphosphine oxide photopolymerization initiator (manufactured by IGM Resins BV).

[0118] <Solvent (D)> · MEK: Methyl ethyl ketone. · Methyl acetate: Methyl acetate.

[0119] <Additive (E)> D1781: Singlet oxygen quencher, bis(dibutyldithiocarbamate)nickel(II), product code D1781 (Tokyo Chemical Industry Co., Ltd.). Tinuvin 249: hindered amine light stabilizer, Tinuvin (registered trademark) 249 (manufactured by BASF Japan Ltd., molecular weight 482). AO-60: Phenolic antioxidant, Adekastab (registered trademark) AO-60 (manufactured by ADEKA Corporation). Tinuvin 479: Hydroxyphenyltriazine-based UV 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).

[0120] (Transparent base material) The following transparent substrates were used: TAC: Triacetylcellulose film (Fujifilm Corporation, TG60UL, substrate thickness 60 μm, UV blocking rate 92.9%). PMMA: Polymethyl methacrylate film (Sumitomo Chemical Co., Ltd., W002N80, substrate thickness 80 μm, UV blocking rate 13.9%).

[0121] (Formation of colored layer) A colored layer-forming composition shown in Table 3 was applied to a transparent substrate shown in Tables 1 and 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 colored 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.

[0122] [Table 3]

[0123] [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.

[0124] (Oxygen barrier layer formation) The oxygen barrier layer-forming composition was applied to the transparent substrate of Example 7 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.

[0125] [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: Methyl acetate.

[0126] (Formation of hard coat layer) A composition for forming a hard coat layer shown in Table 4 was applied to a transparent substrate or an oxygen barrier 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. 2The 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.

[0127] [Table 4]

[0128] [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.

[0129] (Formation of antiglare layer) 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.

[0130] [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 8.5 parts by mass of porous silica fine particles (average particle size 75 nm, solid content 20%) in methyl isobutyl ketone dispersion. Antifouling agent Optool (registered trademark) AR-110 (manufactured by Daikin Industries, Ltd., solid content 15%, solvent: methyl isobutyl ketone) 5.6 parts by mass. Active energy ray curable resin Pentaerythritol triacrylate (PETA) 0.4 parts by weight. Photopolymerization initiator Omnirad TPO (manufactured by IGM Resins BV) 0.07 parts by mass. Leveling agent RS-77 (manufactured by DIC Corporation) 1.7 parts by mass. ·solvent Methyl isobutyl ketone 83.73 parts by mass

[0131] (Formation of low refractive index layer) The composition for forming a low refractive index layer was applied onto the hard coat layer or antiglare 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 200 mJ / cm. 2 The coating was cured by irradiating it with ultraviolet light (H bulb light source, manufactured by Fusion UV Systems Japan Co., Ltd.), to form a low refractive index layer having a thickness of 100 nm after curing.

[0132] [Film characteristic evaluation] <UV blocking rate on 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%.

[0133] <Lightfastness test> The light resistance of the obtained optical film was tested using a xenon weather meter tester (X75, manufactured by Suga Test Instruments Co., Ltd.) under a xenon lamp illumination of 60 W / m 2 The test was conducted for 120 hours at a wavelength of 45°C (300-400nm) and a humidity of 50%RH inside the tester. The transmittance was measured before and after the test using an automatic spectrophotometer (Hitachi, Ltd., U-4100). The difference in transmittance before and after the test, ΔTλ1, was calculated at wavelength λ1, which indicated the minimum transmittance before the test, in the wavelength range of 470-530nm. The difference in transmittance before and after the test, ΔTλ2, was calculated at wavelength λ2, which indicated the minimum transmittance before the test, in the wavelength range of 560-620nm. The closer the transmittance difference to zero, the better. A transmittance difference of |ΔTλN|≦20 (N=1-3) is preferred, and a value of |ΔTλN|≦10 (N=1-3) is even more preferred.

[0134] <Heat resistance test> The heat resistance of the obtained optical film was tested at 90°C for 500 hours, and transmittance was measured before and after the test using an automatic spectrophotometer (U-4100, manufactured by Hitachi, Ltd.). The transmittance difference before and after the test, ΔTλ1, was calculated at wavelength λ1, which represents the minimum transmittance before the test in the wavelength range of 470 nm to 530 nm, and the transmittance difference before and after the test, ΔTλ2, was calculated at wavelength λ2, which represents the minimum transmittance before the test in the wavelength range of 560 nm to 620 nm. The transmittance difference closer to zero is better, and |ΔTλN|≦20 (N=1 to 3) is preferred, and |ΔTλN|≦10 (N=1 to 3) is even more preferred.

[0135] [Display device characteristic evaluation] <White display transmission characteristics> The transmittance of the obtained optical film was measured using an automatic spectrophotometer (U-4100, manufactured by Hitachi, Ltd.), and the efficiency of light transmitted through the optical film during white display was calculated using this transmittance, which was evaluated as the white display transmittance characteristic. As a benchmark, the efficiency of the spectrum during white display output through a white organic EL light source and color filter, whose spectrum is shown in Figure 9, was set at 100. The closer to 100 the value is, the higher the white display transmittance and the more excellent the luminance efficiency.

[0136] <Display device reflection characteristics> The transmittance T(λ) and surface reflectance R(λ) of the obtained optical film were measured using an automatic spectrophotometer (U-4100, manufactured by Hitachi, Ltd.). To measure the surface reflectance R(λ), a matte black dye was applied to the surface opposite the outermost surface of the functional layer to perform an anti-reflection treatment, and the spectral reflectance at an incident angle of 5° was measured to obtain the surface reflectance R(λ). The display panel reflectance was set to 40%, and the interface and surface reflections of other layers were not taken into consideration. The relative reflectance was calculated based on the following formula (II) when the display device reflectance value for a D65 light source (CIE (International Commission on Illumination) standard illuminant D65) without the optical film was set to 100. This was used to evaluate the display device's reflection characteristics. The lower the value of the display device's reflection characteristics, the more effectively it is possible to reduce external light reflection and the more excellent the reflection characteristics.

[0137]

number

[0138] <Color reproducibility> The transmittance of the obtained optical film was measured using an automatic spectrophotometer (U-4100, manufactured by Hitachi, Ltd.), and the red, green, and blue display spectra shown in FIG. 10, output through a white EL light source and a color filter, were measured. The vertical axis of the graphs in FIGS. 9 and 10 represents luminous intensity [au] (arbitrary unit). The NTSC (National Television System Committee) ratio was calculated from the CIE 1931 chromaticity values ​​calculated using the measured transmittance and the red, green, and blue display spectra in FIG. 10, and the NTSC ratio was used to evaluate color reproducibility. The higher the NTSC ratio, the better the color reproducibility.

[0139] As evaluations of optical film properties, the results of the ultraviolet ray shielding rate on the colored layer, light resistance tests, and heat resistance tests are shown in Tables 5 and 6. As evaluations of display device properties, the results of the white display transmission property, display device reflection property, and color reproducibility are shown in Tables 5 and 6. Note that for Comparative Example 5, which used Optical Film M without a colored layer, measurement of the ultraviolet ray shielding rate on the colored layer, light resistance tests, and heat resistance tests were not performed, and therefore these are indicated with "-" in Table 6. Furthermore, the ratio of the white display transmission property based on the white display transmission property in Comparative Example 5 (Comparative Example 5 ratio) and the ratio of the display device reflection property based on the display device reflection property in Comparative Example 5 (Comparative Example 5 ratio) are shown in Tables 5 and 6, respectively.

[0140] [Table 5]

[0141] [Table 6]

[0142] The results in Tables 5 and 6 show that optical films (Examples 1 to 8) equipped with a colored layer using a colored layer-forming composition comprising a dye (A), an active energy ray-curable resin (B), a photopolymerization initiator (C), and a solvent (D) of the present invention exhibit excellent light resistance and heat resistance. Optical films (Examples 3 to 8) equipped with a colored layer made of a colored layer-forming composition to which a singlet oxygen quencher was further added as an additive (E) exhibited even better light resistance. Furthermore, when a transparent substrate (Examples 1 to 5, 7 to 8) or a functional layer with a UV absorbing ability of 85% or more was provided on the colored layer of the optical film (Example 6), light resistance was significantly improved compared to when UV absorbing ability was provided within the colored layer (Comparative Example 4). Furthermore, when an oxygen barrier layer was provided on the colored layer of the present invention (Example 7), light resistance was further improved.

[0143] Furthermore, the reflection characteristics of the display devices equipped with the colored layer of the present invention were significantly reduced (Examples 1 to 8). Furthermore, while it is said that the transmittance is halved with a circular polarizer, the white display transmission characteristics were high, the luminance efficiency was excellent, and the color reproducibility was also improved, confirming that it was possible to achieve both improved display characteristics and reliability. [Explanation of symbols]

[0144] 1,2,3,4,5,6,7,8 Optical film 10 Colored layer 20 Transparent base material 30 Functional Layers 31 Low refractive index layer 32 Hard coat layer 33 Oxygen barrier layer 34 Anti-glare 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 colorant (A) contains a first coloring material and a second coloring material, the first coloring material has an absorption maximum wavelength in the range of 470 to 530 nm and an absorption spectrum half width of 15 to 45 nm; the second coloring material has an absorption maximum wavelength in the range of 560 to 620 nm and an absorption spectrum half width of 15 to 55 nm; The active energy ray-curable resin (B) contains a copolymer of a structural unit represented by the following formula (1) and a structural unit having any one of a (meth)acrylate-based repeating unit, an olefin-based repeating unit, a halogen atom-containing repeating unit, a styrene-based repeating unit, a vinyl acetate-based repeating unit, and a vinyl alcohol-based repeating unit: Composition for forming a colored layer. 【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.

2. 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.

3. The polymer containing the structural unit represented by formula (2) is a copolymer of the structural unit represented by formula (2) and a structural unit having any one of a (meth)acrylate-based repeating unit, an olefin-based repeating unit, a halogen atom-containing repeating unit, a styrene-based repeating unit, a vinyl acetate-based repeating unit, and a vinyl alcohol-based repeating unit. The colored layer forming composition according to claim 2 .

4. The colored layer-forming composition according to claim 1 , further comprising one or more additives (E) 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. The colored layer forming composition according to any one of claims 1 to 6, wherein the dye (A) further contains a third coloring material having a wavelength in the range of 650 to 780 nm with the lowest transmittance in the wavelength range of 380 to 780 nm.

8. A colored layer that is a cured product of the colored layer-forming composition according to any one of claims 1 to 7; 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.

9. The functional layer has an oxygen permeability of 10 cm ３ / (m ２ 9. The optical film according to claim 8, further comprising an oxygen barrier layer having a viscosity of 1000 psi (1000 psi) or less (1000 psi).

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

11. A display device comprising the optical film according to any one of claims 8 to 10.

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