WO2018003763A1 - 光学積層体、偏光板及び表示装置 - Google Patents

光学積層体、偏光板及び表示装置 Download PDF

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Publication number
WO2018003763A1
WO2018003763A1 PCT/JP2017/023477 JP2017023477W WO2018003763A1 WO 2018003763 A1 WO2018003763 A1 WO 2018003763A1 JP 2017023477 W JP2017023477 W JP 2017023477W WO 2018003763 A1 WO2018003763 A1 WO 2018003763A1
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Prior art keywords
optical
functional layer
layer
average
optical laminate
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PCT/JP2017/023477
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English (en)
French (fr)
Japanese (ja)
Inventor
多恵子 前田
直樹 芹澤
隆之 中西
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Toppan Tomoegawa Optical Films Co Ltd
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Toppan Tomoegawa Optical Films Co Ltd
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Application filed by Toppan Tomoegawa Optical Films Co Ltd filed Critical Toppan Tomoegawa Optical Films Co Ltd
Priority to CN201780036195.7A priority Critical patent/CN109313289B/zh
Priority to KR1020187035788A priority patent/KR102194639B1/ko
Priority to CN202110389261.7A priority patent/CN113075760B/zh
Publication of WO2018003763A1 publication Critical patent/WO2018003763A1/ja
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising 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
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/30—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer formed with recesses or projections, e.g. hollows, grooves, protuberances, ribs
    • 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
    • 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
    • G02B1/111—Anti-reflection coatings using layers comprising organic materials
    • 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
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00—Electroluminescent light sources
    • H05B33/02—Details
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/85—Arrangements for extracting light from the devices
    • H10K50/854—Arrangements for extracting light from the devices comprising scattering means
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • 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
    • B32B2255/00—Coating on the layer surface
    • B32B2255/10—Coating on the layer surface on synthetic resin layer or on natural or synthetic rubber layer
    • 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
    • B32B2255/00—Coating on the layer surface
    • B32B2255/26—Polymeric coating
    • 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
    • B32B2307/42—Polarizing, birefringent, filtering

Definitions

  • the present invention relates to an optical laminate suitable for an antiglare film, and a polarizing plate and a display device using the same.
  • a functional film having an antiglare property is provided on the outermost surface of a liquid crystal display, an organic EL display or the like in order to improve image visibility.
  • the antiglare film has a fine concavo-convex structure on the surface, suppresses regular reflection of external light by diffusing the surface reflected light, and prevents diplomacy from being reflected.
  • a coating liquid containing a binder such as an ultraviolet curable resin and fine particles (filler) is applied on a translucent substrate to form a coating film.
  • the coating film is cured by irradiating it with ultraviolet rays, and the antiglare property and other various properties can be adjusted by the particle size and the added amount of the fine particles (see, for example, Patent Documents 1 and 2). ).
  • the conventional anti-glare film has a white appearance and a rough texture when displayed black on the display, and has a low-quality appearance.
  • the present invention provides a high-quality optical laminate having anti-glare properties, little roughness, and capable of displaying a moist and deep black display, and a polarizing plate and an image display device using the same. For the purpose.
  • the present invention relates to an optical laminate in which at least one optical functional layer is laminated on a translucent substrate, and an uneven shape is formed on at least one surface of the optical functional layer.
  • the transmitted image definition using an optical comb with a width of 5 mm is 70 to 95%, and the product of the average area of the convex portions on the outermost surface of the optical functional layer and the arithmetic average height Sa measured by the optical interference method is 4. 7 to 44.0 ⁇ m 3 and the average inclination angle ⁇ a is 0.124 to 0.349 °.
  • a polarizing plate and an image display device according to the present invention are provided with the above optical laminate.
  • the present invention it is possible to provide a high-quality optical laminate that has anti-glare properties, little roughness, and can display a moist and deep black display, and a polarizing plate and an image display device using the same.
  • FIG. 1 is a cross-sectional view illustrating a schematic configuration of an optical layered body according to an embodiment.
  • FIG. 2 is a cross-sectional view illustrating a schematic configuration of the polarizing plate according to the embodiment.
  • FIG. 3 is a cross-sectional view illustrating a schematic configuration of the display device according to the embodiment.
  • FIG. 4 is a graph plotting the relationship between the product of the average area of the protrusions and the arithmetic average height Sa and the evaluation score of smoothness.
  • FIG. 5 is a graph plotting the relationship between the average inclination angle and the blackness evaluation score.
  • FIG. 6 is a graph in which the relationship between the average area of the convex portions and the product of the arithmetic average height Sa and the average inclination angle is plotted.
  • FIG. 1 is a cross-sectional view showing a schematic configuration of an optical layered body according to an embodiment.
  • the optical laminate 100 according to the embodiment includes a translucent substrate 1 and at least one optical functional layer 2 laminated on the translucent substrate 1. Fine irregularities are formed on the surface of the optical functional layer 2.
  • the optical function layer 2 exhibits anti-glare properties by irregularly reflecting the diplomacy by the unevenness.
  • polyethylene terephthalate PET
  • triacetyl cellulose TAC
  • polyethylene naphthalate PEN
  • polymethyl methacrylate PMMA
  • PC polycarbonate
  • PI polyimide
  • PE polypropylene
  • resin films such as (PP), polyvinyl alcohol (PVA), polyvinyl chloride (PVC), cycloolefin copolymer (COC), norbornene resin, polyethersulfone, cellophane, and aromatic polyamide can be suitably used.
  • the total light transmittance (JIS K7105) of the translucent substrate is preferably 80% or more, and more preferably 90% or more.
  • the thickness of the translucent substrate is preferably 1 to 700 ⁇ m and more preferably 25 to 250 ⁇ m in view of the productivity and handling properties of the optical laminate.
  • the translucent substrate is preferably subjected to a surface modification treatment in order to improve adhesion with the optical functional layer.
  • a surface modification treatment include alkali treatment, corona treatment, plasma treatment, sputtering treatment, application of a surfactant and a silane coupling agent, Si deposition, and the like.
  • the optical functional layer contains a base resin, resin particles, and inorganic fine particles.
  • the optical functional layer is formed by applying a coating liquid containing a base resin that is cured by irradiation with ionizing radiation or ultraviolet rays, resin particles, and inorganic fine particles to a translucent substrate and curing the coating film.
  • the base resin a resin that can be cured by irradiation with ionizing radiation or ultraviolet rays can be used.
  • Resin materials that are cured by irradiation with ionizing radiation include radical polymerizable functional groups such as acryloyl group, methacryloyl group, acryloyloxy group, and methacryloyloxy group, and cationic polymerizable functional groups such as epoxy group, vinyl ether group, and oxetane group.
  • radical polymerizable functional groups such as acryloyl group, methacryloyl group, acryloyloxy group, and methacryloyloxy group
  • cationic polymerizable functional groups such as epoxy group, vinyl ether group, and oxetane group.
  • Monomers, oligomers and prepolymers can be used alone or in admixture.
  • Examples of the monomer include methyl acrylate, methyl methacrylate, methoxypolyethylene methacrylate, cyclohexyl methacrylate, phenoxyethyl methacrylate, ethylene glycol dimethacrylate, dipentaerythritol hexaacrylate, trimethylolpropane trimethacrylate, pentaerythritol triacrylate and the like.
  • polyester acrylate polyurethane acrylate, polyfunctional urethane acrylate, epoxy acrylate, polyether acrylate, acrylate compounds such as alkit acrylate, melamine acrylate, silicone acrylate, unsaturated polyester, tetramethylene glycol diglycidyl ether, Epoxy compounds such as propylene glycol diglycidyl ether, neopentyl glycol diglycidyl ether, bisphenol A diglycidyl ether and various alicyclic epoxies, 3-ethyl-3-hydroxymethyloxetane, 1,4-bis ⁇ [((3- Oxeta such as ethyl-3-oxetanyl) methoxy] methyl ⁇ benzene, di [1-ethyl (3-oxetanyl)] methyl ether
  • the compounds can be exemplified.
  • Photopolymerization initiators include radical polymerization initiators such as acetophenone, benzophenone, thioxanthone, benzoin, and benzoin methyl ether, and cationic polymerization starts such as aromatic diazonium salts, aromatic sulfonium salts, aromatic iodonium salts, and metallocene compounds.
  • the agents can be used alone or in combination.
  • the resin particles added to the optical functional layer aggregate in the base resin to form a fine uneven structure on the surface of the optical functional layer.
  • the resin particles are made of a translucent resin material such as acrylic resin, polystyrene resin, styrene- (meth) acrylic acid ester copolymer, polyethylene resin, epoxy resin, silicone resin, polyvinylidene fluoride, and polyfluorinated ethylene resin. Things can be used.
  • the refractive index of the resin particle material is preferably 1.40 to 1.75. In order to adjust the refractive index and dispersion of the resin particles, two or more kinds of resin particles having different materials (refractive index) may be mixed and used.
  • the average particle size of the resin particles is preferably 0.3 to 10.0 ⁇ m, and more preferably 1.0 to 7.0 ⁇ m.
  • the average particle diameter of the resin particles is less than 0.3 ⁇ m, sufficient antiglare property cannot be obtained.
  • the average particle size of the resin particles exceeds 10.0 ⁇ m, the product of the average area of the convex portions and the arithmetic average height Sa increases, and the roughness becomes strong.
  • the content of the resin particles in the solid content of the optical functional layer is 0.1 to 10.0%.
  • the content of the resin particles is less than 0.1%, the unevenness of the surface of the optical functional layer is reduced and the antiglare property is lowered.
  • the content of the resin particles exceeds 10.0%, the product of the average area of the protrusions and the arithmetic average height Sa increases, and the roughness becomes strong.
  • the inorganic fine particles added to the base resin of the optical functional layer are preferably inorganic nanoparticles having an average particle size of 10 to 200 nm.
  • the amount of inorganic fine particles added is preferably 0.1 to 5.0%.
  • swellable clay can be used as the inorganic fine particles.
  • the swellable clay is not particularly limited as long as it has a cation exchange capacity and swells by taking in a solvent between the layers of the swellable clay, even if it is a natural product, it is a synthetic product (including substitution products and derivatives). May be. Moreover, the mixture of a natural product and a synthetic product may be sufficient.
  • swellable clay examples include mica, synthetic mica, vermiculite, montmorillonite, iron montmorillonite, beidellite, saponite, hectorite, stevensite, nontronite, magadiite, isallite, kanemite, layered titanic acid, smectite, and synthetic smectite. Etc.
  • These swellable clays may be used alone or in combination.
  • colloidal silica, an alumina, and a zinc oxide as an inorganic fine particle individually or in mixture.
  • one or more of colloidal silica, alumina, and zinc oxide may be used in combination.
  • the layered organic clay refers to an organic onium ion introduced between the layers of the swellable clay.
  • the organic onium ion is not limited as long as it can be organicized using the cation exchange property of the swellable clay.
  • synthetic smectite layered organic clay mineral
  • Synthetic smectite functions as a thickener that increases the viscosity of the optical functional layer forming resin composition.
  • the addition of synthetic smectite as a thickener suppresses the precipitation of resin particles and inorganic fine particles and contributes to the formation of an uneven structure on the surface of the optical functional layer.
  • a leveling agent may be added to the resin composition for forming the optical functional layer.
  • the leveling agent has a function of being oriented on the surface of the coating film in the drying process, uniforming the surface tension of the coating film, and reducing surface defects of the coating film.
  • Organic solvent may be appropriately added to the resin composition for forming the optical functional layer.
  • Organic solvents include alcohols such as methanol, ethanol, 1-propanol, 2-propanol, butanol, isopropyl alcohol (IPA) and isobutanol; ketones such as acetone, methyl ethyl ketone (MEK), cyclohexanone and methyl isobutyl ketone (MIBK) Ketone alcohols such as diacetone alcohol; aromatic hydrocarbons such as benzene, toluene and xylene; glycols such as ethylene glycol, propylene glycol and hexylene glycol; ethyl cellsolve, butylcellsolve, ethylcarbitol, Glycol ethers such as butyl carbitol, diethyl cellosolve, diethyl carbitol, propylene glycol monomethyl ether; N-methylpyrrolidone, dimethylformamide
  • the film thickness of the optical functional layer is preferably 1.0 to 10.0 ⁇ m, and more preferably 3.0 to 7.0 ⁇ m.
  • the film thickness of the optical functional layer is less than 1 ⁇ m, curing failure due to oxygen inhibition occurs, and the scratch resistance of the optical functional layer tends to be lowered.
  • the film thickness of the optical functional layer exceeds 10.0 ⁇ m, curling due to curing shrinkage of the base resin layer becomes strong, which is not preferable.
  • the transmitted image definition of the optical layered body according to the present embodiment is 70 to 95% as measured using an optical comb having a width of 0.5 mm.
  • the transmitted image definition is less than 70%, the antiglare property becomes excessive and visibility is deteriorated.
  • the transmitted image definition exceeds 95%, the antiglare property cannot be obtained sufficiently.
  • the product of the average area of the convex portions on the outermost surface of the optical functional layer measured by the optical interference method and the arithmetic average height Sa is 4.7 to 44.0 ⁇ m 3 .
  • the convex portion refers to a portion higher than this average surface when the average surface passing through the average level of the vertices of all the convex portions and the lowest point of the concave portion existing on the measurement surface is used as a reference.
  • the average area of the portion is an average value of the cross-sectional areas of the convex portions at the arithmetic average height Sa.
  • the arithmetic average height Sa is a value measured in accordance with ISO 25178, and is a parameter obtained by extending the arithmetic average roughness Ra in the surface direction.
  • the product of the average area of the convex portions and the arithmetic average height Sa is an approximate value of the average volume of the convex portions existing on the average plane when each convex portion is modeled as a columnar body.
  • the product of the average area of the convex portions and the arithmetic average height Sa is an index representing the size of the convex portions existing on the average plane, and is a parameter that correlates with the smoothness and roughness of the optical functional layer surface. It is.
  • the product of the average area of the convex portions and the arithmetic average height Sa is less than 4.7 ⁇ m 3 , the size of the convex portions formed on the surface of the optical function layer is too small, so that the antiglare property cannot be sufficiently obtained. .
  • the product of the average area of the protrusions and the arithmetic average height Sa exceeds 44.0 ⁇ m 3 , the size of the protrusions formed on the surface of the optical function layer is too large, and the roughness becomes strong.
  • the average inclination angle ⁇ a of the concavo-convex shape on the surface of the optical functional layer according to the present embodiment is 0.124 to 0.349 °.
  • ⁇ a is generally measured by measuring the rough surface shape using a stylus type surface roughness meter, and in the roughness curve of the concavo-convex cross section obtained by measurement, the apex of the convex portion within the reference length L and this
  • the sum of the absolute values of the differences from the lowest point of the concave portion adjacent to the convex portion is a value obtained by dividing by the reference length L.
  • the value of the conventional ⁇ a is expanded in the plane direction, It was set as the value calculated using all the convex parts and concave parts in the measurement surface measured by the interference method.
  • the average inclination angle ⁇ a is less than 0.124 °, the size of the convex portion formed on the surface of the optical functional layer is too small, and thus the antiglare property cannot be sufficiently obtained.
  • the average inclination angle ⁇ a exceeds 0.349 °, whiteness increases when black is displayed on the display.
  • the inventors of the present invention determined that the transmitted image definition, the product of the average area of the protrusions and the arithmetic average height Sa, and the average inclination angle were anti-glare, smooth (less rough) and black, respectively. It was newly found that it is a related parameter. As described above, when the value of the transmitted image definition is within a specific range, good antiglare properties that do not impair visibility are obtained. Further, the smaller the product of the average area of the protrusions and the arithmetic average height Sa, the better the smoothness, and the greater the roughness, the greater the roughness (see FIG. 4 described later).
  • the high quality optical device which has good antiglare property, little roughness and can display a moist and deep black display.
  • a laminated body is realized.
  • Random aggregate structure is a three-dimensionally complicated presence of a first phase that contains a relatively large amount of resin components and a second phase that contains a relatively large amount of inorganic components. A structure that is unevenly distributed around fine particles (resin particles).
  • the random aggregated structure can be formed by, for example, a method described in Japanese Patent No. 582043.
  • FIG. 2 is a cross-sectional view showing a schematic configuration of the polarizing plate according to the embodiment.
  • the polarizing plate 110 includes the optical laminate 100 and the polarizing film 11.
  • the optical laminated body 100 is shown in FIG. 1, and a polarizing film (polarizing substrate) 11 is provided on the surface of the translucent substrate 1 on which the optical functional layer 2 is not provided.
  • the polarizing film 11 is obtained by, for example, laminating a transparent substrate 3, a polarizing layer 4, and a transparent substrate 5 in this order.
  • the materials for the transparent substrates 3 and 5 and the polarizing layer 4 are not particularly limited, and those usually used for polarizing films can be used as appropriate.
  • FIG. 3 is a cross-sectional view illustrating a schematic configuration of the display device according to the embodiment.
  • the display device 120 is obtained by laminating the optical laminate 100, the polarizing film 11, the liquid crystal cell 13, the polarizing film (polarizing substrate) 12, and the backlight unit 14 in this order.
  • the polarizing film 12 is obtained by, for example, laminating a transparent base material 6, a polarizing layer 7, and a transparent base material 8 in this order.
  • the materials of the transparent substrates 6 and 8 and the polarizing layer 7 are not particularly limited, and those usually used for a polarizing film can be appropriately used.
  • the liquid crystal cell 13 includes a liquid crystal panel in which liquid crystal molecules are sealed between a pair of transparent substrates having transparent electrodes, and a color filter, and changes the orientation of the liquid crystal molecules according to the voltage applied between the transparent electrodes. By controlling the light transmittance, the light transmittance of each pixel is controlled to form an image.
  • the backlight unit 14 includes a light source and a light diffusing plate (both not shown), and is an illumination device that uniformly diffuses light emitted from the light source and emits it from the emission surface.
  • the display device 120 illustrated in FIG. 3 may further include a diffusion film, a prism sheet, a brightness enhancement film, a retardation film for compensating for a retardation of a liquid crystal cell or a polarizing plate, and a touch sensor.
  • the optical layered body according to the present embodiment further includes at least one layer of a refractive index adjusting layer such as a low refractive index layer, an antistatic layer, and an antifouling layer in addition to the optical functional layer for suppressing glare. Also good.
  • a refractive index adjusting layer such as a low refractive index layer, an antistatic layer, and an antifouling layer in addition to the optical functional layer for suppressing glare. Also good.
  • the low refractive index layer is a functional layer that is provided on the optical functional layer and reduces the reflectance by reducing the refractive index of the surface.
  • the low refractive index layer is formed by applying a coating solution containing an ionizing radiation curable material such as polyester acrylate monomer, epoxy acrylate monomer, urethane acrylate monomer, polyol acrylate monomer and a polymerization initiator, and polymerizing the coating film. It can be formed by curing.
  • the low refractive particles include LiF, MgF, 3NaF.AlF or AlF (all with a refractive index of 1.4), or Na 3 AlF 6 (cryolite, with a refractive index of 1.33).
  • Low refractive index fine particles made of a low refractive material such as the above may be dispersed.
  • particles having voids inside the particles can be suitably used.
  • the voids can be made to have a refractive index of air ( ⁇ 1), so that they can be low refractive index particles having a very low refractive index.
  • the refractive index can be lowered by using low refractive index silica particles having voids inside.
  • the antistatic layer is coated with a coating liquid containing an ionizing radiation curable material such as a polyester acrylate monomer, an epoxy acrylate monomer, a urethane acrylate monomer, a polyol acrylate monomer, a polymerization initiator, and an antistatic agent. It can be formed by curing by polymerization.
  • an antistatic agent include antimony-doped tin oxide (ATO), metal oxide fine particles such as tin-doped indium oxide (ITO), polymer-type conductive compositions, and quaternary ammonium salts. Can be used.
  • ATO antimony-doped tin oxide
  • ITO tin-doped indium oxide
  • the antistatic layer may be provided on the outermost surface of the optical laminate, or may be provided between the optical functional layer and the translucent substrate.
  • the antifouling layer is provided on the outermost surface of the optical laminate and enhances the antifouling property by imparting water repellency and / or oil repellency to the optical laminate.
  • the antifouling layer can be formed by dry coating or wet coating silicon oxide, fluorine-containing silane compound, fluoroalkylsilazane, fluoroalkylsilane, fluorine-containing silicon-based compound, perfluoropolyether group-containing silane coupling agent, etc. .
  • antistatic layer and antifouling layer In addition to the low refractive index layer, antistatic layer and antifouling layer described above, or in addition to the low refractive index layer, antistatic layer and antifouling layer, at least an infrared absorbing layer, an ultraviolet absorbing layer, a color correction layer, etc.
  • One layer may be provided.
  • An optical functional layer-forming coating solution in which the following materials were blended in the proportions shown in Table 1 was prepared, and the prepared coating solution was applied to a 40 ⁇ m thick triacetylcellulose film (translucent substrate). After drying the coating film (volatilizing the solvent), the coating film was irradiated with ultraviolet rays and photocured to obtain optical laminates according to Examples and Comparative Examples. In Table 1, “-” indicates that the corresponding material is not blended.
  • Base resin UV / EB curable resin
  • Light acrylate PE-3A penentaerythritol triacrylate, manufactured by Kyoeisha Chemical Co., Ltd.
  • refractive index 1.52 Resin particles: styrene-methyl methacrylate copolymer particles, refractive index 1.515, average particle size 2.0 ⁇ m or 3.5 ⁇ m
  • Inorganic fine particles 1 Synthetic smectite
  • Inorganic fine particles 2 Alumina nanoparticles, average particle size 40 nm
  • Photopolymerization initiator Irgacure 184 (manufactured by BASF Japan)
  • Solvent Mixed solvent in which toluene and isopropyl alcohol are mixed at a ratio of 16:37
  • the transmitted image definition, average inclination angle, average area of convex portions present on the surface of the optical functional layer, and arithmetic average height Sa of the optical laminates according to Examples and Comparative Examples were measured by the following methods.
  • the transmitted image definition was measured according to JIS K7105 using an image clarity measuring device (ICM-1T, manufactured by Suga Test Instruments Co., Ltd.) with an optical comb width of 0.5 mm.
  • Antiglare properties, film thickness conditions, smoothness and blackness were evaluated according to the following evaluation methods.
  • Table 1 shows the composition of the coating solution for forming an optical functional layer used in Examples and Comparative Examples, the coating thickness of the coating solution, the transmitted image definition, the average inclination angle ⁇ a, the average area of the convex portions, and the arithmetic average height.
  • the evaluation results of the product of Sa, smoothness and blackness are collectively shown.
  • the addition ratio of each component shown in Table 1 is a ratio (mass%) in the total solid mass of the coating liquid for forming an optical functional layer.
  • the total solid content of the coating solution for forming an optical functional layer refers to a component excluding the solvent. Accordingly, the resin particles in the total solid content of the coating liquid for forming an optical functional layer, the blending ratio (% by mass) of inorganic fine particles, and the resin particles in the optical functional layer that is a cured film of the coating liquid for forming an optical functional layer The content ratio (% by mass) of the inorganic fine particles is equal.
  • FIG. 4 is a graph plotting the relationship between the product of the average area of the convex portions and the arithmetic average height Sa and the evaluation score of smoothness
  • FIG. 5 is the relationship between the average inclination angle and the blackness evaluation score. It is a graph. In the graphs of FIGS. 4 and 5, the values of all Examples and Comparative Examples shown in Table 1 are plotted.
  • the product of the average area of the protrusions and the arithmetic average height Sa (that is, the approximate value of the volume of the average-size protrusions) has a negative correlation with the smoothness evaluation score, and the correlation is extremely high. I understand that it is expensive.
  • FIG. 5 also shows that there is a very high negative correlation between the average inclination angle and the blackness evaluation score.
  • FIG. 6 is a graph plotting the relationship between the average area of protrusions and the product of the arithmetic average height Sa and the average inclination angle.
  • black circles are plots of the example, and x marks are plots of the comparative example.
  • the optical laminates according to Examples 1 to 13 are the product of the average area of the convex portions and the arithmetic average height Sa and the average inclination. It was found that the smoothness and blackness of the surface can be improved when the corner is within a certain range (within the range surrounded by the broken line in FIG. 6). More specifically, when the product of the average area of the convex portions and the arithmetic average height Sa is 4.7 to 44.0 ⁇ m 3 and the average inclination angle ⁇ a is 0.124 to 0.349 °. Therefore, it is possible to realize an optical laminated body that is smooth and has no roughness, and is moist and has a deep black display.
  • the optical laminates according to Examples 1 to 13 have a transmission image definition of 70 to 95%, and the product of the average area of the convex portions and the arithmetic average height Sa and the average inclination angle ⁇ a. Are within the above-described range, it was confirmed that smooth and moist deep black display is possible while having anti-glare properties.
  • the optical laminate according to the present invention can be used as an antiglare film for use in image display devices such as liquid crystal displays and organic EL displays.
  • the optical layered body according to the present invention is suitable as an antiglare film particularly for use in a television because it has antiglare properties, has less roughness, and enables a deep black display with moisture.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mathematical Physics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Laminated Bodies (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Polarising Elements (AREA)
  • Surface Treatment Of Optical Elements (AREA)
  • Liquid Crystal (AREA)
  • Materials Engineering (AREA)
PCT/JP2017/023477 2016-06-27 2017-06-27 光学積層体、偏光板及び表示装置 Ceased WO2018003763A1 (ja)

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CN113075760B (zh) 2023-07-07
TWI638210B (zh) 2018-10-11
CN109313289A (zh) 2019-02-05
KR102194639B1 (ko) 2020-12-28
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