WO2022158006A1 - 光学フィルム及び表示装置 - Google Patents

光学フィルム及び表示装置 Download PDF

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Publication number
WO2022158006A1
WO2022158006A1 PCT/JP2021/026611 JP2021026611W WO2022158006A1 WO 2022158006 A1 WO2022158006 A1 WO 2022158006A1 JP 2021026611 W JP2021026611 W JP 2021026611W WO 2022158006 A1 WO2022158006 A1 WO 2022158006A1
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Prior art keywords
layer
ultraviolet
optical
optical film
meth
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Ceased
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PCT/JP2021/026611
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English (en)
French (fr)
Japanese (ja)
Inventor
佳子 石丸
開 二俣
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Toppan Inc
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Toppan Inc
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Priority to CN202180091037.8A priority Critical patent/CN116783516A/zh
Priority to JP2022576952A priority patent/JP7468707B2/ja
Priority to EP21921112.5A priority patent/EP4283346A4/en
Priority to KR1020237020800A priority patent/KR20230129055A/ko
Publication of WO2022158006A1 publication Critical patent/WO2022158006A1/ja
Priority to US18/354,568 priority patent/US20230358932A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G02B5/208—Filters for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G02B5/22—Absorbing filters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/023—Optical properties
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/04—Coating
    • C08J7/042—Coating with two or more layers, where at least one layer of a composition contains a polymer binder
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/04—Coating
    • C08J7/046—Forming abrasion-resistant coatings; Forming surface-hardening coatings
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/04—Coating
    • C08J7/048—Forming gas barrier coatings
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/12—Chemical modification
    • C08J7/16—Chemical modification with polymerisable compounds
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/11—Anti-reflection coatings
    • G02B1/113—Anti-reflection coatings using inorganic layer materials only
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/12—Optical coatings produced by application to, or surface treatment of, optical elements by surface treatment, e.g. by irradiation
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/14—Protective coatings, e.g. hard coatings
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G02B5/22—Absorbing filters
    • G02B5/223—Absorbing filters containing organic substances, e.g. dyes, inks or pigments
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G02B5/28—Interference filters
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/402—Coloured
    • B32B2307/4026—Coloured within the layer by addition of a colorant, e.g. pigments, dyes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2551/00—Optical elements
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2301/00—Characterised by the use of cellulose, modified cellulose or cellulose derivatives
    • C08J2301/08—Cellulose derivatives
    • C08J2301/10—Esters of organic acids
    • C08J2301/12—Cellulose acetate
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2429/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Derivatives of such polymer
    • C08J2429/02—Homopolymers or copolymers of unsaturated alcohols
    • C08J2429/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2433/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
    • C08J2433/04—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters
    • C08J2433/06—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters of esters containing only carbon, hydrogen, and oxygen, the oxygen atom being present only as part of the carboxyl radical

Definitions

  • the present invention relates to optical films and display devices. This application claims priority based on Japanese Patent Application No. 2021-006751 filed in Japan on January 19, 2021, the contents of which are incorporated herein.
  • a method in which a color filter is used to color-separate or correct white light or monochromatic light emitted from the light source of the display device to narrow the half value.
  • a color filter with improved color purity In order to improve the color purity with a color filter, it is necessary to increase the density of the coloring material or thicken the filter. Higher colorant concentrations may degrade photolithographic properties. A thicker filter may degrade the pixel shape and viewing angle characteristics. Furthermore, a color filter with improved color purity generally has a low transmittance, which tends to reduce luminance efficiency.
  • Patent Document 1 discloses a display filter having a color correction layer on a filter base having an antireflection layer and an electromagnetic shielding layer. Since this display filter has a structure in which a color correction layer is provided on an antireflection film, no photolithography process is required for manufacturing, and luminance efficiency is unlikely to decrease.
  • Patent Document 2 discloses a coloring material suitable for the color correction layer.
  • An object of the present invention is to provide an optical film that has a good color correction function and can withstand long-term use.
  • an optical film according to a first aspect of the present invention comprises a sheet-like transparent substrate, a colored layer formed on the first surface side of the transparent substrate and containing a pigment, and an optical functional layer formed on the colored layer, wherein the dye has a maximum absorption wavelength in the range of 470 to 530 nm, and a first colorant in which the half width of the absorption spectrum is 15 to 45 nm.
  • the optical function layer includes a layer having an ultraviolet shielding rate of 85% or more in accordance with JIS L 1925 and a pencil hardness of H or more with a 500 g load on the surface, under conditions of temperature 45 ° C. and humidity 50% RH.
  • ⁇ E*ab which is the chromaticity difference before and after a light resistance test in which a xenon lamp with an illuminance of 60 W/cm at a wavelength of 300 to 400 nm is irradiated for 120 hours , is expressed by the following formula (1): ⁇ E*ab ⁇ 5 Formula (1) meet.
  • a display device comprises: a light source; and an optical film according to the first aspect, in which the second surface of the transparent substrate opposite to the first surface is arranged to face the light source. Prepare.
  • an optical film that has a good color correction function and can withstand long-term use, and a display device using the optical film.
  • FIG. 3 is a schematic cross-sectional view of an optical film 1B according to a third embodiment of the invention. It is a schematic cross section of the optical film 1C which concerns on 4th embodiment of this invention. It is a schematic cross section of optical film 1D which concerns on 5th embodiment of this invention. It is a spectrum of a light source used for evaluation of transmission characteristics. It is the spectrum of the light source used for evaluation of color reproducibility.
  • FIG. 1 is a schematic cross-sectional view of an optical film 1 according to this embodiment.
  • the optical film 1 includes a sheet-shaped transparent base material 10, a colored layer 30 containing a dye formed on the first surface 10a side of the transparent base material 10, and an optical functional layer 20 formed on the colored layer 30. and
  • the transparent base material 10 may be simply referred to as the base material 10 in some cases.
  • the direction in which the substrate 10, the colored layer 30, and the optical function layer 20 are laminated is referred to as the thickness direction, and one side in the thickness direction (observation side when observing the display image of the display device) is The upper side is called the upper side, and the opposite side is called the lower side.
  • the base material 10 is made of a material that is highly transparent to visible light.
  • Materials for forming the substrate 10 include polyolefins such as polyethylene and polypropylene; polyesters such as polyethylene terephthalate, polybutylene terephthalate and polyethylene naphthalate; polyacrylates such as polymethyl methacrylate; polyamides such as nylon 6 and nylon 66; Transparent resins such as arylate, polycarbonate, triacetylcellulose, polyacrylate, polyvinyl alcohol, polyvinyl chloride, cycloolefin copolymer, norbornene-containing resin, polyethersulfone, and polysulfone, and inorganic glass can be used.
  • a film made of polyethylene terephthalate (PET), a film made of triacetyl cellulose (TAC), a film made of polymethyl methacrylate (PMMA), and a film made of polyester can be preferably used.
  • the thickness of the substrate 10 is not particularly limited, it is preferably 10 to 100 ⁇ m.
  • the colored layer 30 contains a pigment for selectively absorbing the wavelength band of visible light.
  • the colored layer 30 may have a structure in which a dye is contained in a base resin made of an active energy ray-curable resin.
  • the pigment includes at least one of the first to third coloring material groups shown below.
  • the type of colorant to be included is not limited to one type, and two or more types of colorant may be included.
  • the first coloring material has a maximum absorption wavelength within the range of 470 nm to 530 nm, and a half width (full width at half maximum) of the absorption spectrum of 15 nm to 45 nm.
  • the second coloring material has a maximum absorption wavelength within the range of 560 nm to 620 nm, and a half width (full width at half maximum) of the absorption spectrum of 15 nm to 55 nm.
  • the third colorant has a wavelength of 650 to 800 nm with the lowest transmittance in the wavelength range of 400 to 800 nm.
  • the half width of the absorption spectrum refers to the full width at half maximum.
  • the colored layer 30 has an absorption such that the transmittance of the maximum absorption wavelength in one of the absorption wavelength bands of the coloring material is 1% or more and less than 50%.
  • the visible light emitted by the display device has a wavelength range with relatively low emission intensity. Visible light can be absorbed by the colored layer 30 .
  • the visible light in the wavelength range of 400 to 800 nm, respectively, in the ranges of 470 nm to 530 nm, 560 nm to 620 nm, and 650 to 800 nm is colored. 30 can be absorbed.
  • the wavelengths absorbed by the first, second, and third colorants are relatively It is a range that overlaps with the wavelength range where the emission intensity is low.
  • the display device is not limited to the organic EL display device, and other display devices may be used.
  • the colored layer 30 may contain at least one of a radical scavenger, a singlet oxygen quencher and a peroxide decomposer.
  • the colorant contained in the colored layer 30 is also degraded by light, heat, etc. accelerated under the influence of oxygen.
  • the highly reactive singlet oxygen which tends to cause oxidative deterioration (fading) of the dye, is deactivated, thereby suppressing oxidative deterioration (fading) of the dye. can do.
  • the peroxide decomposer When the peroxide decomposer is mixed in the colored layer 30, the peroxide decomposer decomposes the peroxide generated when the pigment is oxidized and deteriorated, so that the auto-oxidation cycle is stopped and the pigment deterioration (fading) is prevented. can be suppressed.
  • a radical scavenger and a singlet oxygen quencher may be used in combination. Additionally, a peroxide decomposer may be combined.
  • a hindered amine light stabilizer can be used as a radical scavenger.
  • a hindered amine light stabilizer having a molecular weight of 2,000 or more is particularly preferred because it provides a high effect of suppressing fading.
  • the molecular weight of the radical scavenger is low, it is likely to volatilize, so few molecules remain in the colored layer 30, and it may be difficult to obtain a sufficient anti-fading effect.
  • Examples of materials suitably used as radical scavengers include Chimassorb 2020FDL, Chimassorb 944FDL, Tinuvin 622 manufactured by BASF, and LA-63P manufactured by ADEKA.
  • singlet oxygen quenchers include transition metal complexes, dyes, amines, phenols, and sulfides, and particularly preferably used materials include dialkyl phosphate, dialkyldithiocarbanate, benzenedithiol, or the like. Transition metal complexes of dithiols can be exemplified, and nickel, copper or cobalt is preferably used as the central metal of these transition metal complexes.
  • the peroxide decomposer decomposes the peroxide that is generated when the pigment is oxidatively deteriorated, stops the auto-oxidation cycle, and suppresses pigment deterioration (fading).
  • Phosphorus-based antioxidants and sulfur-based antioxidants can be used as peroxide decomposers.
  • Phosphorus antioxidants include, for example, 2,2′-methylenebis(4,6-di-t-butyl-1-phenyloxy)(2-ethylhexyloxy)phosphorus, 3,9-bis(2,6-di -tert-butyl-4-methylphenoxy)-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane, and 6-[3-(3-t-butyl-4-hydroxy- 5-methylphenyl)propoxy]-2,4,8,10-tetra-t-butyldibenz[d,f][1,3,2]dioxaphosphepine and the like.
  • sulfur-based antioxidants examples include 2,2-bis( ⁇ [3-(dodecylthio)propionyl]oxy ⁇ methyl)-1,3-propanediyl-bis[3-(dodecylthio)propionate], 2-mercaptobenz imidazole, dilauryl-3,3'-thiodipropionate, dimyristyl-3,3'-thiodipropionate, distearyl-3,3'-thiodipropionate, pentaerythrityl-tetrakis(3-laurylthiopropionate pionate), 2-mercaptobenzothiazole, and the like.
  • the optical function layer 20 shown in FIG. 1 has a hard coat layer 21 in contact with the colored layer 30 and a low refractive index layer 22 formed on the hard coat layer 21 .
  • the hard coat layer 21 is a hard resin layer and enhances the scratch resistance of the optical film 1 . Moreover, the hard coat layer 21 may have a higher refractive index than the low refractive index layer 22 .
  • the resin constituting the hard coat layer 21 is a resin that is polymerized and cured by irradiation with active energy rays such as ultraviolet rays and electron beams. Available.
  • active energy rays such as ultraviolet rays and electron beams.
  • active energy rays such as ultraviolet rays and electron beams. Available.
  • (meth)acrylate is a generic term for both acrylate and methacrylate
  • (meth)acryloyl is a generic term for both acryloyl and methacryloyl.
  • Examples of monofunctional (meth)acrylate compounds include 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, n-butyl (meth)acrylate, isobutyl ( meth)acrylate, t-butyl (meth)acrylate, glycidyl (meth)acrylate, acryloylmorpholine, N-vinylpyrrolidone, tetrahydrofurfuryl acrylate, cyclohexyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, isobornyl (meth)acrylate ) acrylate, isodecyl (meth) acrylate, lauryl (meth) acrylate, tridecyl (meth) acrylate, cetyl (meth) acrylate, stearyl (meth) acrylate, benzyl (meth) acrylate,
  • bifunctional (meth)acrylate compounds include ethylene glycol di(meth)acrylate, diethylene glycol di(meth)acrylate, butanediol di(meth)acrylate, hexanediol di(meth)acrylate, nonanediol di(meth) acrylates, 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( Di(meth)acrylates such as meth)acrylate, neopentyl glycol di(meth)acrylate, ethoxylated neopentyl glycol di(meth)acrylate, tripropylene glycol di(meth)acrylate, and neopentylglycol
  • tri- or higher functional (meth)acrylate compounds include trimethylolpropane tri(meth)acrylate, ethoxylated trimethylolpropane tri(meth)acrylate, propoxylated trimethylolpropane tri(meth)acrylate, and tris-2-hydroxyethyl.
  • Tri(meth)acrylates such as isocyanurate tri(meth)acrylate, glycerin tri(meth)acrylate, pentaerythritol tri(meth)acrylate, dipentaerythritol tri(meth)acrylate, ditrimethylolpropane tri(meth)acrylate, etc.) Functional (meth)acrylate compounds, pentaerythritol tetra(meth)acrylate, ditrimethylolpropane tetra(meth)acrylate, dipentaerythritol tetra(meth)acrylate, dipentaerythritol penta(meth)acrylate, ditrimethylolpropane penta(meth)acrylate, ) acrylate, dipentaerythritol hexa (meth) acrylate, ditrimethylolpropane hexa (meth) acrylate trifunctional or higher polyfunctional (meth) acrylate compounds,
  • Urethane (meth)acrylate can also be used as an active energy ray-curable resin.
  • urethane (meth)acrylates include those obtained by reacting a product obtained by reacting a polyester polyol with an isocyanate monomer or a prepolymer with a (meth)acrylate monomer having a hydroxyl group. .
  • urethane (meth)acrylates examples include pentaerythritol triacrylate hexamethylene diisocyanate urethane prepolymer, dipentaerythritol pentaacrylate hexamethylene diisocyanate urethane prepolymer, pentaerythritol triacrylate toluene diisocyanate urethane prepolymer, dipentaerythritol pentaacrylate toluene diisocyanate.
  • Examples include urethane prepolymers, pentaerythritol triacrylate isophorone diisocyanate urethane prepolymers, and dipentaerythritol pentaacrylate isophorone diisocyanate urethane prepolymers.
  • the resins described above may be used alone or in combination of two or more. Further, the above resin may be a monomer in the composition for forming a hard coat layer, or may be a partially polymerized oligomer.
  • the hard coat layer 21 preferably has a pencil hardness of H or higher with a load of 500 g on the surface.
  • the hard coat layer 21 contains an ultraviolet absorber in order to suppress deterioration of the dye contained in the colored layer 30 . Thereby, the hard coat layer 21 also becomes an ultraviolet shielding layer having an ultraviolet shielding rate of 85% or more.
  • the UV shielding rate is a value measured according to JIS L 1925, and calculated by the following formula.
  • Ultraviolet shielding rate (%) 100 - average transmittance of ultraviolet rays with a wavelength of 290 to 400 nm (%)
  • the absorption wavelength range of the ultraviolet absorber contained in the hard coat layer 21 in the ultraviolet region is preferably in the range of 290 to 370 nm.
  • ultraviolet absorbers include benzophenone-based, benzotriazole-based, triazine-based, oxalic acid anilide-based, and cyanoacrylate-based compounds.
  • the ultraviolet absorber is blended in order to suppress deterioration of pigments contained in the colored layer 30 . For this reason, an ultraviolet absorber is used that absorbs light in the wavelength range that contributes to the deterioration of the dye contained in the colored layer 30 in the ultraviolet region.
  • the hard coat layer 21 is a UV shielding layer (UV absorption layer), and an ultraviolet absorber whose absorption wavelength range in the ultraviolet region is different from the absorption wavelength region in the ultraviolet region of the photopolymerization initiator is used.
  • UV absorption layer UV absorption layer
  • acyl A phosphine oxide-based photopolymerization initiator can be preferably used.
  • acylphosphine oxide-based photopolymerization initiators include diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide and phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide.
  • the absorption wavelength regions of the ultraviolet absorber and the photopolymerization initiator By making the absorption wavelength regions of the ultraviolet absorber and the photopolymerization initiator different, it is possible to suppress curing inhibition when forming the ultraviolet shielding layer containing the ultraviolet absorber, and after curing, it is included in the colored layer 30. It is possible to suppress the deterioration of the pigment that is applied by ultraviolet rays.
  • photopolymerization initiators used in the hard coat layer-forming composition include, for example, 2,2-ethoxyacetophenone, 1-hydroxycyclohexylphenyl ketone, dibenzoyl, benzoin, benzoin methyl ether, benzoin ethyl ether, p-chloro Benzophenone, p-methoxybenzophenone, Michler's ketone, acetophenone, 2-chlorothioxanthone and the like can be used.
  • One type of these may be used alone, or two or more types may be used in combination.
  • Solvents used in the hard coat layer-forming composition include dibutyl ether, dimethoxymethane, dimethoxyethane, diethoxyethane, propylene oxide, 1,4-dioxane, 1,3-dioxolane, and 1,3,5-trioxane.
  • Ethers such as , tetrahydrofuran, anisole and phenetole, and ketones such as acetone, methyl ethyl ketone, diethyl ketone, dipropyl ketone, diisobutyl ketone, methyl isobutyl ketone, cyclopentanone, cyclohexanone, methylcyclohexanone and methylcyclohexanone, and ethyl formate.
  • ketones such as acetone, methyl ethyl ketone, diethyl ketone, dipropyl ketone, diisobutyl ketone, methyl isobutyl ketone, cyclopentanone, cyclohexanone, methylcyclohexanone and methylcyclohexanone, and ethyl formate.
  • composition for forming a hard coat layer may contain metal oxide fine particles for the purpose of adjusting the refractive index and imparting hardness.
  • Metal oxide fine particles include zirconium oxide, titanium oxide, niobium oxide, antimony trioxide, antimony pentoxide, tin oxide, indium oxide, indium tin oxide, and zinc oxide.
  • composition for forming a hard coat layer includes a silicon oxide, a fluorine-containing silane compound, a fluoroalkylsilazane, a fluoroalkylsilane, a fluorine-containing silicon-based compound, which imparts water repellency and/or oil repellency and enhances antifouling properties.
  • Any perfluoropolyether group-containing silane coupling agent may be contained.
  • a leveling agent As other additives, a leveling agent, an antifoaming agent, an antioxidant, a light stabilizer, a photosensitizer, a conductive material, etc. may be added to the composition for forming the hard coat layer.
  • the low refractive index layer 22 is arranged on the side closest to the user (viewer) viewing the display when the optical film 1 is applied to the display device.
  • the low refractive index layer 22 prevents strong reflection of external light and improves the visibility of the display device.
  • the low refractive index layer 22 may be a layer containing an inorganic substance or an inorganic compound.
  • inorganic substances and inorganic compounds include fine particles such as LiF, MgF, 3NaF.AlF, AlF, Na 3 AlF 6 and silica fine particles.
  • silica fine particles have voids inside the particles such as porous silica fine particles and hollow silica fine particles, it is effective in lowering the refractive index of the low refractive index layer.
  • the composition for forming the low refractive index layer may appropriately contain the photopolymerization initiator, solvent, and other additives described for the hard coat layer 21 .
  • the refractive index of the low refractive index layer 22 should be lower than the refractive index of the substrate 10, preferably 1.55 or less. Also, the film thickness of the low refractive index layer 22 is not particularly limited, but is preferably 40 nm to 1 ⁇ m.
  • the low refractive index layer 22 may contain any one of silicon oxide, fluorine-containing silane compound, fluoroalkylsilazane, fluoroalkylsilane, fluorine-containing silicon-based compound, and perfluoropolyether group-containing silane coupling agent. These materials can impart water repellency and/or oil repellency to the low refractive index layer 22, thereby enhancing antifouling properties.
  • the optical film 1 can be produced by forming the colored layer 30 on the first surface 10a of the substrate 10, and then forming the hard coat layer 21 and the low refractive index layer 22 on the colored layer 30 in this order.
  • the colored layer 30, the hard coat layer 21, and the low refractive index layer 22 can be formed, for example, by applying a coating liquid containing constituent materials of each layer and drying.
  • the low refractive index layer 22 can be formed by vapor deposition, sputtering, or the like, for example.
  • the hard coat layer 21 can be easily formed by forming the hard coat layer 21 with an energy ray curable compound such as an ultraviolet curable resin.
  • the hard coat layer 21 can be formed by applying a coating liquid containing an energy ray-curable compound, a polymerization initiator, and an ultraviolet absorber, and irradiating the corresponding energy ray.
  • an ultraviolet curable resin is used, as described above, the absorption wavelength range of the photopolymerization initiator in the ultraviolet region is preferably different from the absorption wavelength range of the ultraviolet absorber in the ultraviolet region.
  • the optical film 1 can be arranged inside a display device such as a display as a color correction filter.
  • a display device such as a display as a color correction filter.
  • the second surface (10b shown in FIG. 1) opposite to the first surface 10a of the base material 10 is arranged toward the light source side.
  • the wavelength components near the maximum absorption wavelength of the included colorant are absorbed.
  • the color purity of the display device can be improved.
  • the colorant contained in the colored layer 30 has an excellent color correction function, it may not have sufficient resistance to light rays, particularly ultraviolet rays. Therefore, when irradiated with ultraviolet rays, it deteriorates over time and becomes unable to absorb light in the vicinity of the maximum absorption wavelength.
  • the optical film 1 of the present embodiment is attached to the display device as described above, external light including ultraviolet rays entering the display screen passes through the hard coat layer 21 and then enters the colored layer 30 . Since the hard coat layer 21 has a high ultraviolet shielding rate, most of the ultraviolet rays contained in the outside light do not pass through the hard coat layer 21 and do not reach the colored layer 30 .
  • ⁇ E*ab which is the chromaticity difference before and after the light resistance test (xenon lamp illuminance 60 W/cm 2 (300 to 400 nm), temperature 45° C., humidity 50% RH, irradiation for 120 hours) is the following formula (1): ⁇ E*ab ⁇ 5 Formula (1) can satisfy That is, it is possible to prevent deterioration of the coloring material contained in the colored layer 30, and to maintain the color correction function for a long time.
  • ⁇ E*ab in Equation (1) is a chromaticity difference standardized by CIE (Commission international de l'eclairage).
  • FIG. 2 is a schematic cross-sectional view showing the layer structure of the optical film 1A of this embodiment.
  • the optical film 1A includes a transparent base material 10, a colored layer 30 containing a pigment formed on the first surface 10a side of the base material 10, and an optical function layer 20 formed on the colored layer 30.
  • the optical film 1 ⁇ /b>A includes an antiglare layer (Anti Glare Layer: AG layer) 23 as the optical functional layer 20 .
  • the optical function layer 20 has an ultraviolet shielding layer, and may have a layer containing the ultraviolet absorber described in the first embodiment, or the antiglare layer 23 may contain an ultraviolet absorber. .
  • the ultraviolet shielding rate of the ultraviolet shielding layer conforming to JIS L 1925 is 85% or more.
  • the anti-glare layer 23 is a layer that has fine irregularities on its surface, and reduces reflection of external light by scattering external light with these irregularities.
  • the antiglare layer 23 can be formed by applying and curing an antiglare layer forming composition containing an active energy ray-curable resin and, if necessary, organic fine particles and/or inorganic fine particles.
  • the active energy ray-curable resin used in the composition for forming the antiglare layer the resin described for the hard coat layer 21 can be used. Thereby, the scratch resistance of the optical film 1A can be improved.
  • the film thickness of the antiglare layer 23 is not particularly limited, it is preferably 1 to 10 ⁇ m.
  • the organic fine particles used in the composition for forming the antiglare layer are mainly a material that forms fine irregularities on the surface of the antiglare layer 23 and imparts the function of diffusing external light.
  • translucent resin materials such as acrylic resins, polystyrene resins, styrene-(meth)acrylic acid ester copolymers, polyethylene resins, epoxy resins, silicone resins, polyvinylidene fluoride, and polyethylene fluoride resins are used. Resin particles can be used. In order to adjust the refractive index and the dispersibility of the resin particles, two or more kinds of resin particles having different materials (refractive indexes) may be mixed and used.
  • the inorganic fine particles used in the composition for forming the antiglare layer are mainly materials for adjusting the sedimentation and aggregation of the organic fine particles in the antiglare layer 23 .
  • silica fine particles, metal oxide fine particles, various mineral fine particles, and the like can be used.
  • 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.
  • metal oxide fine particles that can be used include alumina, zinc oxide, tin oxide, antimony oxide, indium oxide, titania, and zirconia.
  • Mineral fine particles include, for example, mica, synthetic mica, vermiculite, montmorillonite, iron montmorillonite, bentonite, beidellite, saponite, hectorite, stevensite, nontronite, magadiite, islarite, kanemite, layered titanate, smectite, synthetic Smectite and the like can be used.
  • Mineral fine particles may be either natural products or synthetic products (including substituted products and derivatives), and a mixture of both may be used.
  • layered organoclays are more preferred.
  • a layered organic clay is a swelling clay in which organic onium ions are introduced between layers.
  • the organic onium ion is not limited as long as it can be organicized by utilizing the cation exchange property of the swelling clay.
  • the synthetic smectite described above can be preferably used. Synthetic smectite has the function of increasing the viscosity of the coating liquid for forming the antiglare layer, suppressing the sedimentation of resin particles and inorganic fine particles, and adjusting the irregular shape of the surface of the optical function layer.
  • the antiglare layer-forming composition may contain any one of silicon oxide, fluorine-containing silane compound, fluoroalkylsilazane, fluoroalkylsilane, fluorine-containing silicon-based compound, and perfluoropolyether group-containing silane coupling agent. good. Since these materials can impart water repellency and/or oil repellency to the antiglare layer 23, antifouling properties can be enhanced.
  • the anti-glare layer 23 is formed as a layer in which a layer with a relatively high refractive index and a layer with a relatively low refractive index are laminated in order from the colored layer 30 side (lower side) by unevenly distributing the material. You may
  • the anti-glare layer 23 in which the materials are unevenly distributed is formed by, for example, coating a composition containing a low refractive index material containing surface-modified silica fine particles or hollow silica fine particles and a high refractive index material. It can be formed by phase separation using the energy difference.
  • the refractive index of the layer with a relatively high refractive index on the colored layer 30 side is set to 1.50 to 2.40, and the refractive index of the layer on the surface side of the optical film 1A is set to 1.50 to 2.40. It is preferable that the refractive index of the layer having the lowest refractive index is 1.20 to 1.55.
  • the optical film 1A can be manufactured by forming the colored layer 30 on the first surface 10a of the substrate 10 and then forming the antiglare layer 23 on the colored layer 30 in sequence.
  • the antiglare layer 23 can be formed, for example, by applying a coating liquid containing constituent materials of each layer and drying the coating liquid.
  • the optical film 1A according to the present embodiment can reduce the reflection of external light while preventing deterioration of the coloring material contained in the colored layer 30 in the same manner as in the above-described first embodiment.
  • FIG. 3 is a schematic cross-sectional view showing the layer structure of the optical film 1B of this embodiment.
  • the optical film 1B includes a transparent base material 10, a colored layer 30 containing a dye formed on the first surface 10a side of the base material 10, and an optical functional layer 20 formed on the colored layer 30.
  • the optical film 1 ⁇ /b>B includes a hard coat layer 21 as an optical functional layer 20 and an antiglare layer 23 formed on the hard coat layer 21 .
  • the optical function layer 20 has an ultraviolet shielding layer and may have a layer containing the ultraviolet absorber described in the first embodiment. It may be In addition, the ultraviolet shielding rate of the ultraviolet shielding layer conforming to JIS L 1925 is 85% or more.
  • the optical film 1B can be produced by forming the colored layer 30 on the first surface 10a of the substrate 10, and then forming the hard coat layer 21 and the antiglare layer 23 on the colored layer 30 in this order.
  • the optical film 1 ⁇ /b>B according to this embodiment has the same effects as those of the above-described embodiments, and can exhibit optical functions based on the optical function layer 20 .
  • FIG. 4 is a schematic cross-sectional view showing the layer structure of the optical film 1C of this embodiment.
  • the optical film 1C includes a transparent base material 10, a colored layer 30 containing a pigment formed on the first surface 10a side of the base material 10, and an optical functional layer 20 formed on the colored layer 30.
  • the optical film 1 ⁇ /b>C includes an antiglare layer 23 as an optical functional layer 20 and a low refractive index layer 22 formed on the antiglare layer 23 .
  • the optical function layer 20 has an ultraviolet shielding layer and may have a layer containing the ultraviolet absorber described in the first embodiment. may be included.
  • the ultraviolet shielding rate of the ultraviolet shielding layer conforming to JIS L 1925 is 85% or more.
  • the optical film 1C can be manufactured by forming the colored layer 30 on the first surface 10a of the substrate 10, and then forming the antiglare layer 23 and the low refractive index layer 22 on the colored layer 30 in this order.
  • the optical film 1 ⁇ /b>C according to this embodiment can exhibit the same effects as those of the above-described embodiments, and can exhibit optical functions based on the optical function layer 20 .
  • FIG. 5 is a schematic cross-sectional view showing the layer structure of the optical film 1D of this embodiment.
  • the optical film 1D includes a transparent base material 10, a colored layer 30 containing a dye formed on the first surface 10a side of the base material 10, and an optical function layer 20 formed on the colored layer 30.
  • the optical film 1D includes an oxygen barrier layer 40 as the optical functional layer 20, a hard coat layer 21 formed on the oxygen barrier layer 40, and a low refractive index layer 22 formed on the hard coat layer 21.
  • the optical function layer 20 has an ultraviolet shielding layer, may have a layer containing the ultraviolet absorber described in the first embodiment, or may include an oxygen barrier layer 40, a hard coat layer 21, or a low refractive index layer. 22 may contain a UV absorber.
  • the ultraviolet shielding rate of the ultraviolet shielding layer conforming to JIS L 1925 is 85% or more.
  • the oxygen barrier layer 40 is a transparent layer having optical transparency, and has an oxygen permeability of 10 cc/(m 2 ⁇ day ⁇ atm) or less, preferably 5 cc/(m 2 ⁇ day ⁇ atm) or less. It is more preferably 1 cc/(m 2 ⁇ day ⁇ atm) or less.
  • the material for forming the oxygen barrier layer 40 preferably contains polyvinyl alcohol (PVA), ethylene-vinyl alcohol copolymer (EVOH), vinylidene chloride, siloxane resin, etc. Maxieve (registered trademark) manufactured by Mitsubishi Gas Chemical Company, Inc. , EVAL manufactured by Kuraray Co., Ltd., Saran Latex and Saran Resin manufactured by Asahi Kasei Corporation can be used.
  • the thickness of the oxygen barrier layer 40 is not particularly limited, and may be a thickness that provides desired oxygen barrier properties.
  • Inorganic particles may also be dispersed in the oxygen barrier layer 40 .
  • Oxygen permeability can be further reduced by the inorganic particles, and oxidative deterioration (discoloration) of the colored layer 30 can be further suppressed.
  • the size and content of the inorganic particles are not particularly limited, and may be appropriately set according to the thickness of the oxygen barrier layer 40 and the like.
  • the size (maximum length) of the inorganic particles dispersed in the oxygen barrier layer 40 is preferably less than the thickness of the oxygen barrier layer 40, and the smaller the better.
  • the size of the inorganic particles dispersed in the oxygen barrier layer 40 may be uniform or non-uniform. Specific examples of inorganic particles dispersed in the oxygen barrier layer 40 include silica particles, alumina particles, silver particles, copper particles, titanium particles, zirconia particles, tin particles, and the like.
  • the optical film 1D can be produced by forming the colored layer 30 on the first surface 10a of the substrate 10, and sequentially forming the oxygen barrier layer 40, the hard coat layer 21, and the low refractive index layer 22 on the colored layer 30. .
  • the number and positions of the oxygen barrier layers 40 can be set as appropriate.
  • the oxygen barrier layer 40 may be laminated on the observer side above the colored layer 30 .
  • an oxygen barrier layer 40 may be further provided between the colored layer 30 and the antiglare layer 23 .
  • an oxygen barrier layer 40 is further provided between the colored layer 30 and the hard coat layer 21 or between the hard coat layer 21 and the antiglare layer 23. good too.
  • another oxygen barrier layer may be provided between the colored layer 30 and the substrate 10, and the colored layer 30 may be sandwiched between the oxygen barrier layers.
  • the optical function layer 20 is not limited to the configuration described above.
  • an antireflection layer in which a plurality of low refractive index layers and high refractive index layers are combined is also an example of the optical function layer 20 in the present invention.
  • the resin used for the composition for forming the high refractive index layer the active energy ray-curable resin described for the hard coat layer 21 may be used. Thereby, in addition to the function of preventing reflection, the scratch resistance of the optical film can be enhanced.
  • optical film according to the present invention will be further explained using examples and comparative examples.
  • the present invention is not limited at all by the specific contents of each of the following examples.
  • Dye-1 Pyromethene cobalt complex dye represented by chemical formula 1 described later (maximum absorption wavelength 493 nm, half width 26 nm)
  • ⁇ Second coloring material Dye-2 tetraazaporphyrin copper complex dye (FDG-007 manufactured by Yamada Chemical Co., Ltd., maximum absorption wavelength 595 nm, half width 22 nm)
  • Dye-3 Tetraazaporphyrin copper complex dye (PD-311S manufactured by Yamamoto Kasei Co., Ltd., maximum absorption wavelength 586 nm, half width 22 nm)
  • Dye-4 phthalocyanine copper complex dye (FDN-002 manufactured by Yamada Chemical Co., Ltd., maximum absorption wavelength 800 nm (800 nm is the wavelength with the lowest transmittance in the wavelength range of 400 to 800 nm))
  • Dye-5 dye (FDG-003 manufactured by Yamada
  • a triacetyl cellulose film (TAC) having a thickness of 60 ⁇ m was used as a transparent substrate, and the composition for forming a colored layer shown in Table 4 was applied to one side of the transparent substrate and dried in an oven at 80° C. for 60 seconds. rice field. After that, the coating film is cured by performing ultraviolet irradiation with an irradiation dose of 150 mJ/cm 2 (manufactured by Fusion UV Systems Japan, light source H bulb) using an ultraviolet irradiation device, and the film thickness after curing becomes 5.0 ⁇ m. Colored layers 1 to 10 were formed by adjusting the thickness as follows. In addition, the addition amount is a mass ratio.
  • the composition for forming an oxygen barrier layer was applied onto the colored layer and dried to form an oxygen barrier layer 1 shown in Table 1 having an oxygen permeability of 1 cc/(m 2 ⁇ day ⁇ atm).
  • composition for forming hard coat layer The materials used in the composition for forming a hard coat layer were used for forming the hard coat layer described below.
  • ⁇ Ultraviolet absorber Tinuvin479 (manufactured by BASF Japan, maximum absorption wavelength 322 nm)
  • LA-36 manufactured by ADEKA, maximum absorption wavelength 310 nm, 350 nm
  • ⁇ Active energy ray curable resin UA-306H (manufactured by Kyoeisha Chemical Co., Ltd., pentaerythritol triacrylate hexamethylene diisocyanate urethane prepolymer)
  • DPHA dipentaerythritol hexaacrylate
  • PETA penentaerythritol triacrylate
  • ⁇ Initiator Omnirad TPO (manufactured by IGM Resins B.V., absorption wavelength peaks 275 nm, 379 nm) Omnirad 184 (man
  • the composition for forming a hard coat layer shown in Table 5 is applied onto the colored layer, the transparent substrate, or the oxygen barrier layer 1, dried in an oven at 80°C for 60 seconds, and then irradiated with an ultraviolet irradiation device.
  • the hard coat layer 1 in Tables 1 and 2 having a thickness of 5.0 ⁇ m after curing is cured by irradiating with ultraviolet rays (light source H bulb, manufactured by Fusion UV Systems Japan) at a dose of 150 mJ/cm 2 . ⁇ 3 were formed. Since the hard coat layers 1 and 3 contain an ultraviolet absorber, they also serve as ultraviolet shielding layers.
  • composition for forming antiglare layer The following materials were used as the antiglare layer-forming composition for forming the antiglare layer.
  • ⁇ Ultraviolet absorber Tinuvin479 (manufactured by BASF Japan, maximum absorption wavelength 322 nm)
  • LA-36 manufactured by ADEKA, maximum absorption wavelength 310 nm, 350 nm
  • ⁇ Active energy ray curable resin Light acrylate PE-3A (manufactured by Kyoeisha Chemical Co., Ltd., refractive index 1.52)
  • Photoinitiator Omnirad TPO (manufactured by IGM Resins B.V., absorption wavelength peaks 275 nm, 379 nm)
  • Organic fine particles Styrene-methyl methacrylate copolymer particles (refractive index 1.515, average particle size 2.0 ⁇ m)
  • Inorganic fine particles 1 Synthetic smectite/inorganic fine particles 2: A
  • the composition for forming an antiglare layer shown in Table 6 is applied onto the layer structure shown in Table 1, dried in an oven at 80 ° C. for 60 seconds, and then using an ultraviolet irradiation device.
  • the coating film is cured by irradiating with ultraviolet rays (light source H bulb manufactured by Fusion UV Systems Japan Co., Ltd.) at an irradiation dose of 150 mJ/cm 2 to form the antiglare layer shown in Table 1 with a film thickness of 5.0 ⁇ m after curing. did. Since the antiglare layer 1 contains an ultraviolet absorber, it also serves as an ultraviolet shielding layer.
  • composition for forming low refractive index layer The following materials were used as the composition for forming a low refractive index layer.
  • ⁇ Refractive index adjuster Porous silica fine particle dispersion (average particle diameter 75 nm, solid content 20%, solvent methyl isobutyl ketone) 8.5 parts by mass
  • Antifouling agent Optool AR-110 (manufactured by Daikin Industries, Ltd., solid content 15%, solvent methyl isobutyl ketone) 5.6 parts by mass
  • Active energy ray curable resin Pentaerythritol triacrylate 0.4 parts by mass Initiator: Omnirad 184 (manufactured by IGM Resins B.V.) 0.07 parts by mass
  • Solvent Methyl isobutyl ketone 83.73 parts by mass
  • the composition for forming a low refractive index layer having the above composition is applied and dried in an oven at 80 ° C. for 60 seconds, and then an ultraviolet irradiation device (Fusion UV Systems Japan Co., Ltd., light source
  • the coating film was cured by irradiating with ultraviolet rays at an irradiation dose of 200 mJ/cm 2 using an H bulb) to form the low refractive index layers shown in Tables 1 and 2 having a film thickness of 100 nm after curing.
  • the ultraviolet shielding layer (ultraviolet absorbing layer) formed on the colored layer of the obtained optical film was peeled off from the colored layer using cellophane tape conforming to the JIS-K5600 adhesion test, and the ultraviolet shielding layer alone was placed on the cellophane tape. The layer was transferred.
  • the ultraviolet shielding layer (ultraviolet absorbing layer) of the optical film is a layer containing an ultraviolet absorbent among the optical functional layers, and includes the hard coat layers 1 and 3 and the antiglare layer 1 . Tables 7 and 8 show the ultraviolet shielding layer (ultraviolet absorbing layer) contained in each optical film.
  • the transmittance of the single layer of the ultraviolet shielding layer is measured using an automatic spectrophotometer (U-4100, manufactured by Hitachi, Ltd.), and measured in the ultraviolet region (290 to 400 nm). was calculated. The obtained average transmittance was used to calculate the ultraviolet shielding rate shown in Equation (2).
  • Ultraviolet shielding rate (%) 100 - average transmittance (%) in the ultraviolet region (290 to 400 nm)
  • Transmittance is measured using an automatic spectrophotometer (U-4100, manufactured by Hitachi, Ltd.) before and after the test, and the wavelength showing the minimum transmittance in the absorption wavelength range of the first to third colorants
  • U-4100 automatic spectrophotometer
  • a transmittance difference ⁇ T ⁇ before and after the test at ⁇ and a color difference ⁇ E*ab with a C light source before and after the test were calculated.
  • Transmittance difference and color difference close to zero are preferable, and ⁇ E*ab ⁇ 5 is preferable.
  • Display device characteristic evaluation In Examples 8 to 11 and Comparative Examples 7 to 10 below, display device characteristics of the display devices using the obtained optical films 8, 10, 11, and 18 to 21 were evaluated by simulation as follows. In the simulation, the display device had a configuration in which an optical film was bonded to an organic EL display device (object). In the organic EL display device, which is the object to which the optical film is bonded, the spectral spectrum is as shown in FIG. 6 during white display, and the single spectrum as shown in FIG. Become. (Transmission characteristics (white display transmission characteristics)) The transmittance of the obtained optical film was measured using an automatic spectrophotometer (U-4100, manufactured by Hitachi, Ltd.).
  • the spectral spectrum after transmission through the optical film was calculated by multiplying the individual spectral spectra during white display of the EL display device.
  • the Y value is calculated by multiplying the spectrum of the organic EL display device when white is displayed alone and the spectral spectrum after transmission of the optical film by the relative luminosity, and the spectrum of the organic EL display device when white is displayed alone. Efficiency was defined as the ratio when the Y value obtained from the above was 100, and was evaluated as an index of the transmission characteristics of the display device.
  • DCI Digital Cinema Initiatives
  • Tables 7 and 8 show the results of the UV shielding rate, pencil hardness, and light resistance test of the UV shielding layer (UV absorbing layer) as the optical film property evaluation of the optical films 1 to 17 shown in Tables 1 and 2.
  • the optical films of Examples 1 to 11 are provided with a colored layer and an optical functional layer having an ultraviolet absorbing ability disposed above the colored layer.
  • the UV shielding rate of the optical functional layer having UV absorption ability disposed above the colored layer is 85% or more. From the results in Tables 7 and 8, the optical films (Examples 1 to 11) provided with a colored layer according to the present invention were not provided with ultraviolet absorption ability as in Comparative Examples 1, 2, 5 and 6, and in Comparative Example 3.
  • the light resistance of the colored layer is significantly improved, compared with the case where it is provided in the colored layer.
  • the determination of pencil hardness is "OK".
  • the pencil hardness was judged as "NG”. This is probably because the absorption wavelength peak of the initiator of the hard coat layer 3 overlapped with the absorption wavelength of the ultraviolet absorber.
  • the hard coat layer 1 or antiglare layer 1 included in Examples 1 to 11 is an ultraviolet shielding layer (ultraviolet absorption layer) formed of an active energy ray-curable resin containing an ultraviolet absorber. By shifting the absorption wavelength band of the polymerization initiator, it was possible to achieve both UV shielding ability and hardness.
  • Table 9 shows the results of simulating white display transmission characteristics and color reproducibility as characteristic evaluations of display devices using optical films 8, 10, 11 and 18-21.
  • the display device to which the optical film having the colored layer of the present invention was attached exhibited a DCI standard coverage rate of 90% or more, and compared to Comparative Example 7 without the colored layer, the color reproducibility was improved. did.
  • the DCI chromaticity inclusion rate was greatly improved in Example 8, which has a large absorption in the wavelength band of the first colorant.
  • Comparative Example 8 in which the first colorant and the second colorant have deep absorption in a plurality of wavelength bands, the white display transmission characteristic is low. Therefore, when the colored layer contains a plurality of types of colorants, the transmittance at only one of the maximum absorption wavelengths of the colorants should be 1% or more and less than 50%. is preferred.
  • Comparative Examples 9 and 10 which use colorants whose wavelength range and half-value width do not conform to the regulations, have low color reproducibility evaluations.
  • Examples 8 to 11 exhibited a certain color correction function and were also excellent in white display transmission characteristics.
  • the optical film may include the colored layer 30 and the optical function layer 20 formed above the colored layer 30 and including a layer (ultraviolet shielding layer) having ultraviolet absorption capability.
  • the layer having ultraviolet absorption ability may be the hard coat layer 21 or the antiglare layer 23 .
  • the antiglare layer 23 may use the resins mentioned in the composition of the hard coat layer 21 in the first embodiment. That is, the optical function layer 20 may have a cured film of the composition containing the energy ray-curable compound, the photopolymerization initiator, and the ultraviolet absorber described in the first embodiment.
  • the optical function layer 20 has a UV shielding rate of 85% or higher in accordance with JIS L 1925, and a surface pencil hardness of H or higher with a load of 500 g. This can improve the scratch resistance of the optical film while preventing deterioration of the coloring material contained in the colored layer 30 .
  • desired functions may be imparted to the optical film of the present invention by providing another layer.
  • other layers include an antistatic layer and an antifouling layer.
  • an antistatic agent may be added to any layer of the optical functional layer 20 of the optical film to impart antistatic properties.
  • Antifouling properties may be imparted by incorporating a material having water repellency and/or oil repellency into any layer of the optical function layer 20 .
  • Optical film 10 Substrate (transparent substrate) 10a first surface 10b second surface 20 optical function layer 21 hard coat layer 22 low refractive index layer 23 antiglare layer 30 colored layer 40 oxygen barrier layer

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