Classifications

• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B5/00—Optical elements other than lenses
  • G02B5/30—Polarising elements
  • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
  • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
  • G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
  • G02B5/305—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks including organic materials, e.g. polymeric layers
• • 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
  • B32B27/00—Layered products comprising a layer of synthetic resin
• • 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
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F230/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and containing phosphorus, selenium, tellurium or a metal
  • C08F230/04—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and containing phosphorus, selenium, tellurium or a metal containing a metal
  • C08F230/06—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and containing phosphorus, selenium, tellurium or a metal containing a metal containing boron
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F267/00—Macromolecular compounds obtained by polymerising monomers on to polymers of unsaturated polycarboxylic acids or derivatives thereof as defined in group C08F22/00
  • C08F267/06—Macromolecular compounds obtained by polymerising monomers on to polymers of unsaturated polycarboxylic acids or derivatives thereof as defined in group C08F22/00 on to polymers of esters
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J7/00—Adhesives in the form of films or foils
  • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
  • C09J7/38—Pressure-sensitive adhesives [PSA]
• • 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
  • G02B5/30—Polarising elements
• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B5/00—Optical elements other than lenses
  • G02B5/30—Polarising elements
  • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
  • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
• • 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
• • 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
  • G02F1/133528—Polarisers
• • 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
  • G02F1/13363—Birefringent elements, e.g. for optical compensation
• • 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
• • 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
  • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
• • 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
• • 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
• • 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
  • H10K59/80—Constructional details
  • H10K59/8791—Arrangements for improving contrast, e.g. preventing reflection of ambient light
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
  • C09J2203/318—Applications of adhesives in processes or use of adhesives in the form of films or foils for the production of liquid crystal displays
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
  • C09J2203/326—Applications of adhesives in processes or use of adhesives in the form of films or foils for bonding electronic components such as wafers, chips or semiconductors
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J2301/00—Additional features of adhesives in the form of films or foils
  • C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
  • C09J2301/302—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier the adhesive being pressure-sensitive, i.e. tacky at temperatures inferior to 30°C
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J2433/00—Presence of (meth)acrylic polymer
  • C09J2433/001—Presence of (meth)acrylic polymer in the barrier layer

Definitions

• the present invention relates to an optical laminate, a polarizing plate and an image display device.
• the IPS (In-Plane Switching) type and FFS (Fringe Field Switching) type liquid crystal display devices are different from the TN (Twisted Nematic) type and VA (Vertical Alignment) type in which an electric field is applied between the upper and lower substrates and driven by the rise of the liquid crystal molecules.
• TN Transmission Nematic
• VA Very Alignment
• Patent Document 1 describes "a retardation film characterized by having a protective film formed by cationic polymerization and curing on both sides of an olefin resin film having an in-plane retardation of 50 nm or more" ([Claim 1]).
• the present inventors have studied an optical laminate having a film substrate such as an olefin resin film and an adhesive layer, and have found that, from the viewpoint of durability and suppression of component migration of the adhesive layer, if a barrier layer is provided between the film substrate and the adhesive layer, the adhesion to the adhesive layer may be poor depending on the type of barrier layer.
• an object of the present invention is to provide an optical laminate, a polarizing plate, and an image display device each having a barrier layer with excellent adhesion to the pressure-sensitive adhesive layer.
• an optical laminate having a film substrate, a barrier layer, and an adhesive layer in this order has good adhesion to the adhesive layer when the barrier layer satisfies a predetermined condition, and completed the present invention. That is, the inventors have found that the above object can be achieved by the following configuration.
• [6] further comprising an optically anisotropic layer;
• a polarizing plate comprising a polarizer and the optical laminate according to any one of [1] to [6].
• An image display device comprising the optical layered body according to any one of [1] to [6] or the polarizing plate according to [7].
• the image display device according to [8] which is a liquid crystal display device.
• an optical laminate, a polarizing plate, and an image display device having a barrier layer with excellent adhesion to the pressure-sensitive adhesive layer.
• each component may use the substance applicable to each component individually by 1 type, or may use 2 or more types together.
• the content of the component refers to the total content of the substances used in combination unless otherwise specified.
• (meth)acrylate is a notation representing “acrylate” or “methacrylate”
• (meth)acryl is a notation representing "acrylic” or “methacryl”
• (meth)acryloyl is a notation representing "acryloyl” or “methacryloyl”.
• the optical layered body of the present invention is an optical layered body having a film substrate, a barrier layer, and an adhesive layer in this order, wherein the barrier layer is formed using a barrier layer-forming composition containing a monomer having a polymerizable group, and satisfies the following conditions 1 and 2.
• Condition 1 A functional group (hereinafter also abbreviated as “specific functional group”) that reacts with a hydroxyl group to form a covalent bond is present on the surface of the barrier layer on the pressure-sensitive adhesive layer side.
• Condition 2 No hydroxyl groups other than the hydroxyl groups contained in the specific functional groups are present in the region from the pressure-sensitive adhesive layer side surface of the barrier layer to half the thickness of the barrier layer.
• the "surface of the barrier layer on the pressure-sensitive adhesive layer side” refers to a surface region of up to 20 nm in the thickness direction of the barrier layer from the surface of the barrier layer on the pressure-sensitive adhesive layer side, and hereinafter also abbreviated as "surface layer A”.
• surface layer A the presence of specific functional groups in the surface layer A of the barrier layer can be confirmed by, for example, time-of-flight secondary ion mass spectrometry (TOF-SIMS).
• TOF-SIMS time-of-flight secondary ion mass spectrometry
• examples of the above-described specific functional group include a boronic acid group, an isocyanate group, a silanol group, and a carboxyl group.
• the boronic acid group, the isocyanate group, and the silanol group are preferable, and the boronic acid group is more preferable, because they can easily form a covalent bond.
• the phrase "hydroxyl group contained in the specific functional group” in the definition that "there are no hydroxyl groups other than the hydroxyl group contained in the specific functional group” is intended, for example, on the assumption that the specific functional group is a boronic acid group (-B(OH) 2 ) or the like, and is not intended to necessarily include a hydroxyl group in the specific functional group.
• the present inventors presume as follows. First, by satisfying condition 1, it is considered possible to react with hydroxyl groups and the like that may exist on the surface of the pressure-sensitive adhesive layer to form covalent bonds. By satisfying the condition 2, it is considered that the specific functional group is not deactivated in the barrier layer and can be effectively subjected to the reaction with the hydroxyl group or the like that may be present on the surface of the pressure-sensitive adhesive layer.
• the optical laminate of the present invention has a film substrate.
• the film substrate is preferably transparent.
• transparent as used herein means that the transmittance of visible light is 60% or more.
• the transmittance is preferably 80% or more, more preferably 90% or more.
• Film substrates include, for example, polymer films.
• Materials for the polymer film include, for example, cellulose-based polymers, (meth)acrylic-based polymers, polyester-based polymers, cycloolefin-based polymers, and polymers obtained by mixing two or more of these polymers.
• the film substrate preferably comprises a cycloolefin-based polymer film because the effect of the present invention, that is, the effect of improving the adhesion to the pressure-sensitive adhesive layer becomes apparent.
• cycloolefin-based polymers include (1) norbornene-based polymers, (2) monocyclic cycloolefin polymers, (3) cyclic conjugated diene polymers, (4) vinyl alicyclic hydrocarbon polymers, and hydrides of (1) to (4).
• the thickness of the film substrate is not particularly limited, it is preferably 30 ⁇ m or less, more preferably 5 ⁇ m to 30 ⁇ m, even more preferably 7 ⁇ m to 25 ⁇ m, and particularly preferably 10 ⁇ m to 20 ⁇ m.
• the optical layered body of the present invention has a barrier layer.
• the barrier layer is a layer that is formed using a barrier layer-forming composition containing a monomer having a polymerizable group and that satisfies Conditions 1 and 2 described above. Each component of the barrier layer-forming composition is described below.
• the monomer contained in the barrier layer-forming composition is not particularly limited as long as it is a monomer having a polymerizable group.
• the polymerizable group is not particularly limited, but is preferably a polymerizable group capable of radical polymerization or cationic polymerization.
• the radically polymerizable group a known radically polymerizable group can be used, and acryloyloxy group or methacryloyloxy group can be mentioned as suitable groups.
• an acryloyloxy group is generally known to have a high polymerization rate, and an acryloyloxy group is preferred from the viewpoint of improving productivity, but a methacryloyloxy group can also be used as the polymerizable group.
• a known cationic polymerizable group can be used, and specific examples thereof include an alicyclic ether group, a cyclic acetal group, a cyclic lactone group, a cyclic thioether group, a spiroorthoester group, and a vinyloxy group.
• an alicyclic ether group or a vinyloxy group is preferable, and an epoxy group, an oxetanyl group or a vinyloxy group is particularly preferable.
• particularly preferred polymerizable groups include polymerizable groups represented by any of the following formulas (P-1) to (P-20).
• the monomer is preferably a polyfunctional monomer having two or more polymerizable groups, more preferably a polyfunctional monomer having two or more acryloyloxy groups or methacryloyloxy groups.
• a monofunctional monomer may be used in combination with the polyfunctional monomer as the above monomer.
• bifunctional monomers include, for example, 1,4-butanediol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, neopentyl glycol di(meth)acrylate, ethylene glycol di(meth)acrylate, triethylene glycol di(meth)acrylate, (meth)acrylic acid diesters of alkylene glycol, (meth)acrylic acid diesters of polyoxyalkylene glycol, and (meth)acrylic acid diesters of polyhydric alcohols.
• trifunctional monomers examples include trimethylolpropane triacrylate, trimethylolpropane PO (propylene oxide)-modified triacrylate, trimethylolpropane EO (ethylene oxide)-modified triacrylate, trimethylolpropane trimethacrylate, and pentaerythritol triacrylate.
• tetra- or higher functional monomers examples include pentaerythritol tetraacrylate, pentaerythritol tetramethacrylate, dipentaerythritol pentaacrylate, dipentaerythritol pentamethacrylate, dipentaerythritol hexaacrylate, and dipentaerythritol hexamethacrylate.
• Monofunctional monomers that can be used in combination with polyfunctional monomers are not particularly limited, but compounds having a polymerizable group and a boronic acid group (boronic acid monomers) are suitable from the viewpoint of adhesion to the film substrate.
• boronic acid monomers include those described in paragraphs [0060] to [0073] of WO2020/045224.
• the monomer shrinkage amount S represented by the following formula for the monomer is preferably 0.1 or less, more preferably 0.02 or less.
• Monomer shrinkage amount S thickness of barrier layer ( ⁇ m)/polymerizable group equivalent of monomer
• the polymerizable group equivalent is calculated by [monomer molecular weight]/[number of polymerizable groups per monomer molecule].
• the barrier layer-forming composition preferably contains a polymerization initiator.
• the polymerization initiator is not particularly limited, and includes thermal polymerization initiators and photopolymerization initiators depending on the type of polymerization reaction.
• a photopolymerization initiator capable of initiating a polymerization reaction by ultraviolet irradiation is preferred.
• Examples of photopolymerization initiators include ⁇ -carbonyl compounds (described in US Pat. Nos. 2,367,661 and 2,367,670), acyloin ethers (described in US Pat. No. 2,448,828), ⁇ -hydrocarbon-substituted aromatic acyloin compounds (described in US Pat. No.
• an oxime-type polymerization initiator is also preferable. Specific examples thereof include polymerization initiators described in paragraphs [0049] to [0052] of WO2017/170443.
• a commercially available oxime-type polymerization initiator Irgacure OXE01 (manufactured by BASF) or the like can be used.
• two or more polymerization initiators having different ultraviolet absorption wavelengths in combination in order to accelerate the polymerization reaction, it is also preferable to use two or more polymerization initiators having different ultraviolet absorption wavelengths in combination.
• the polymerization initiator in order to efficiently react the monomers and increase the degree of polymerization, the polymerization initiator is efficiently cleaved during ultraviolet (UV) curing, and the amount of the polymerization initiator remaining in the film after UV curing is preferably reduced from the viewpoint of durability.
• the barrier layer film is immersed in a tetrahydrofuran (THF) solvent, the polymerization initiator is extracted, and then analyzed using high performance liquid chromatography (HPLC), whereby the amount of polymerization initiator remaining per unit area of the film can be quantified.
• the amount of unreacted polymerization initiator is preferably less, preferably less than 0.1 mmol/m 2 , more preferably less than 0.05 mmol/m 2 , still more preferably less than 0.02 mmol/m 2 .
• the barrier layer-forming composition preferably contains a leveling agent because it facilitates satisfying Condition 1 described above.
• a leveling agent a fluorine-based leveling agent or a silicon-based leveling agent is preferable because the leveling effect is high with respect to the amount added, and a fluorine-based leveling agent is more preferable because it is less likely to cause bleeding (bloom, bleed).
• leveling agents include compounds described in paragraphs [0079] to [0102] of JP-A-2007-069471, compounds represented by general formula (I) described in JP-A-2013-047204 (particularly compounds described in paragraphs [0020] to [0032]), and compounds represented by general formula (I) described in JP-A-2012-211306.
• the barrier layer-forming composition preferably contains a solvent from the viewpoint of workability for forming the barrier layer.
• solvents include ketones (e.g., acetone, 2-butanone, methyl isobutyl ketone, cyclopentanone, and cyclohexanone), ethers (e.g., dioxane, tetrahydrofuran, and propylene glycol monomethyl ether acetate (PGMEA)), aliphatic hydrocarbons (e.g., hexane), alicyclic hydrocarbons (e.g., cyclohexane), aromatic hydrocarbons (e.g., toluene, xylene, and trimethylbenzene), halogenated carbons (e.g., dichloromethane, chloroethane, dichlorobenzene, and chlorotoluene), esters (e.g., methyl acetate, ethyl acetate, and
• the method of forming the barrier layer using the barrier layer-forming composition is not particularly limited, but for example, a method of forming a coating film by applying the barrier layer-forming composition on the above-described film base material, and subjecting the coating film to a curing treatment can be mentioned.
• the application can be performed by known methods (eg, wire bar coating method, extrusion coating method, direct gravure coating method, reverse gravure coating method, and die coating method).
• Examples of the curing treatment for the coating film include known methods, and energy beam irradiation, light irradiation treatment or heat treatment is preferred, and light irradiation treatment is particularly preferred. Ultraviolet rays are preferably used in the light irradiation treatment.
• the conditions for the light irradiation treatment are not particularly limited, but are preferably 10 mJ/cm 2 to 50 J/cm 2 , more preferably 20 mJ/cm 2 to 5 J/cm 2 .
• light irradiation treatment may be performed under heating conditions.
• the barrier layer preferably does not exhibit liquid crystallinity for the reason that the display performance of the image display device of the present invention, which will be described later, is improved.
• the thickness of the barrier layer is not particularly limited, it is preferably 0.2 ⁇ m or more, more preferably 0.5 ⁇ m or more.
• the upper limit is not particularly limited, it is preferably 10 ⁇ m or less, more preferably 8 ⁇ m or less, and even more preferably 5 ⁇ m or less from the viewpoint of ensuring the flexibility of the optical layered body.
• the oxygen permeability coefficient of the barrier layer is preferably 30% or less, more preferably 20% or less, and even more preferably 10% or less of the oxygen permeability coefficient of the film substrate, from the viewpoint of durability and suppression of component migration of the pressure-sensitive adhesive layer.
• the oxygen permeability coefficient can be determined by measurement according to JIS K7126-1.
• a barrier layer having a low oxygen permeability coefficient In order to achieve a barrier layer with a low oxygen permeability coefficient, monomers (such as unbonded low-molecular-weight components) and unbonded polymerizable groups remaining in the film after UV curing are preferably reduced in order to efficiently react the monomers and increase the degree of polymerization.
• the barrier layer film is immersed in a THF solvent (using a solvent capable of eluting the target monomer), and after the monomers are extracted, the amount of residual monomers per unit area of the film can be quantified by analysis using high performance liquid chromatography (HPLC).
• the amount of unreacted monomers is preferably less, specifically less than 0.1 mmol/m 2 , more preferably less than 0.02 mmol/m 2 , still more preferably less than 0.01 mmol/m 2 .
• the amount of residual double bonds can be determined by the following infrared absorption measurement.
• the infrared absorption peak area A at around 810 cm ⁇ 1 attributed to the carbon-carbon double bond (C ⁇ C) of the (meth)acryloyloxy group in the barrier layer already applied and the infrared absorption peak area B at around 1720 cm ⁇ 1 attributed to the acyl group (C ⁇ O) were measured before and after the polymerization reaction, [(A/B after polymerization)/(A/B before polymerization)].
• the remaining unbonded (meth)acryloyloxy group remaining amount can be calculated from ⁇ 100.
• the unbound polymerizable groups are less than 50%, more preferably less than 35%. More preferably less than 25%.
• the optical laminate of the present invention has an adhesive layer.
• the pressure-sensitive adhesive contained in the pressure-sensitive adhesive layer is preferably a pressure-sensitive adhesive having hydroxyl groups on the surface when it is formed as the pressure-sensitive adhesive layer.
• acrylic adhesives pressure-sensitive adhesives
• acrylic pressure-sensitive adhesives are preferable from the viewpoint of transparency, weather resistance, heat resistance, and the like.
• a (meth)acrylic polymer is used and usually contains alkyl (meth)acrylate as a main component as a monomer unit. Examples of the alkyl (meth)acrylate constituting the main skeleton of the (meth)acrylic polymer include linear or branched alkyl groups having 1 to 18 carbon atoms.
• Alkyl (meth)acrylates containing an aromatic ring such as phenoxyethyl (meth)acrylate and benzyl (meth)acrylate can also be used.
• the alkyl (meth)acrylate containing an aromatic ring may be used by mixing a polymer obtained by polymerizing this with the (meth)acrylic polymer exemplified above, or may be used by copolymerizing with the alkyl (meth)acrylate. From the viewpoint of transparency, copolymerization is preferred. Details of the adhesive are described, for example, in [0071]-[0084] of JP-A-2018-60014. The description of the publication is incorporated herein by reference.
• the residual amount of the (meth)acrylic acid ester-based monomer having a cyclic structure in the pressure-sensitive adhesive layer is preferably 100 ppm or less for the reason of good durability. Also when a (meth)acrylic acid ester-based monomer having a cyclic structure is used as the barrier layer monomer, the residual amount is preferably 100 ppm or less.
• the method of forming the pressure-sensitive adhesive layer is not particularly limited, but for example, a method of applying a solution of the pressure-sensitive adhesive onto a release sheet, drying it, and then transferring it to the surface of the transparent polymer layer; a method of directly applying the solution of the pressure-sensitive adhesive to the surface of the transparent polymer layer and drying;
• the adhesive solution is prepared as a solution of about 10 to 40% by mass by dissolving or dispersing the adhesive in a solvent such as toluene or ethyl acetate.
• a roll coating method such as reverse coating or gravure coating, a spin coating method, a screen coating method, a fountain coating method, a dipping method, a spray method, or the like can be employed.
• examples of materials constituting the release sheet include synthetic polymer films such as polyethylene, polypropylene, and polyethylene terephthalate; rubber sheets; paper; cloth; nonwoven fabric; net;
• the thickness of the pressure-sensitive adhesive layer is not particularly limited, but is preferably 3 ⁇ m to 50 ⁇ m, more preferably 4 ⁇ m to 50 ⁇ m, even more preferably 5 ⁇ m to 50 ⁇ m, and particularly preferably 5 ⁇ m to 30 ⁇ m, for the reason of good durability.
• the storage elastic modulus of the pressure-sensitive adhesive layer is preferably 0.18 Mpa or more, more preferably 0.45 Mpa or more, and even more preferably 2.2 Mpa or more, for good durability.
• the storage elastic modulus of the pressure-sensitive adhesive layer is preferably 5 Mpa or less.
• the storage elastic modulus of the pressure-sensitive adhesive layer refers to a value measured by laminating the pressure-sensitive adhesive and using a tensile tester according to the following method.
• a plurality of pressure-sensitive adhesive tapes are laminated and autoclaved at 60° C. ⁇ 0.5 MPa ⁇ 30 minutes to prepare a sample for dynamic viscoelasticity test with a thickness of 1 mm.
• This sample is subjected to a dynamic viscoelasticity test using a tensile tester (shear rheometer (Anton Paar; device name: MCR301) within the linear region and at a frequency of 1 Hz.
• the storage elastic modulus is measured at a temperature range of -40°C to +150°C at a heating rate of 3°C/min, and the value at 30°C is read.
• the optical laminate of the present invention is a laminate having the film base material, the barrier layer and the adhesive layer in this order, but it is preferably a laminate having the film base material, the barrier layer and the adhesive layer adjacent to each other in this order.
• optical laminate of the present invention preferably has an optically anisotropic layer for the reason that the viewing angle of the display device is improved, and more preferably has an optically anisotropic layer, the above-described film substrate, a barrier layer, and an adhesive layer in this order.
• the optically anisotropic layer is preferably formed using a liquid crystal composition containing a liquid crystal compound (hereinafter also abbreviated as "optically anisotropic layer-forming composition").
• the molecules of the liquid crystal compound are preferably fixed in a homogeneously aligned smectic phase or nematic phase.
• the liquid crystal compound contained in the composition for forming an optically anisotropic layer is a liquid crystal compound having a polymerizable group.
• liquid crystal compounds can be classified into a rod-like type and a disk-like type according to their shape. Furthermore, there are low-molecular-weight and high-molecular-weight types, respectively.
• Polymers generally refer to those having a degree of polymerization of 100 or more (Polymer Physics: Phase Transition Dynamics, Masao Doi, p. 2, Iwanami Shoten, 1992).
• any liquid crystal compound can be used in the present invention, it is preferable to use a rod-like liquid crystal compound or a discotic liquid crystal compound, and it is more preferable to use a rod-like liquid crystal compound.
• a liquid crystal compound having a polymerizable group is used for immobilizing the liquid crystal compound described above, and it is more preferable that the liquid crystal compound has two or more polymerizable groups in one molecule.
• at least one liquid crystal compound preferably has two or more polymerizable groups in one molecule. After the liquid crystal compound is fixed by polymerization, it is no longer necessary to exhibit liquid crystallinity.
• the type of the polymerizable group is not particularly limited, and includes the same polymerizable groups as those possessed by the monomer contained in the barrier layer-forming composition described above.
• rod-like liquid crystal compound for example, those described in claim 1 of JP-A-11-513019 or paragraphs [0026] to [0098] of JP-A-2005-289980 can be preferably used.
• Paragraphs [0013] to [0108] of Paragraphs [0013] to [0108] can be preferably used, but are not limited to these.
• a reverse wavelength dispersion liquid crystal compound can be used as the liquid crystal compound.
• the term "reverse wavelength dispersion" liquid crystal compound as used herein refers to a compound in which the in-plane retardation (Re) value at a specific wavelength (visible light range) of a retardation film produced using the same is measured, and the Re value becomes equal or higher as the measured wavelength increases.
• the reverse wavelength dispersion liquid crystal compound is not particularly limited as long as it can form a reverse wavelength dispersion film as described above. 3]), and compounds represented by the general formula (1) described in JP-A-2016-081035 (in particular, compounds described in paragraphs [0043] to [0055]).
• the composition for forming an optically anisotropic layer may contain an alignment control agent, if necessary.
• an alignment control agent various alignment states such as homogeneous alignment, homeotropic alignment (vertical alignment), tilted alignment, hybrid alignment, and cholesteric alignment can be formed, and a specific alignment state can be controlled more uniformly and precisely.
• a low-molecular alignment control agent and a high-molecular alignment control agent can be used.
• the low-molecular-weight alignment control agent for example, paragraphs [0009] to [0083] of JP-A-2002-20363, paragraphs [0111] to [0120] of JP-A-2006-106662, and paragraphs [0021] to [0029] of JP-A-2012-211306 can be referred to, the contents of which are incorporated herein.
• the alignment control agent includes paragraphs [0023] to [0032] of JP-A-2008-225281, paragraphs [0052]-[0058] of JP-A-2012-208397, paragraphs [0024]-[0055] of JP-A-2008-026730, and paragraphs [0043]-[0043]-[ of JP-A-2016-193869. [0055] paragraph, the contents of which are incorporated herein.
• cholesteric orientation can be realized by adding a chiral agent to the composition for forming an optically anisotropic layer, and the direction of rotation of the cholesteric orientation can be controlled by the orientation of the chirality.
• the pitch of cholesteric orientation may be controlled according to the orientation regulating force of the chiral agent.
• composition for forming an optically anisotropic layer may contain other components than those mentioned above.
• Other components include, for example, the polymerization initiator, leveling agent and solvent described in the barrier layer-forming composition.
• the polymerization conditions are not particularly limited, but it is preferable to use ultraviolet rays in the polymerization by light irradiation.
• the irradiation dose is preferably 10 mJ/cm 2 to 50 J/cm 2 , more preferably 20 mJ/cm 2 to 5 J/cm 2 , still more preferably 30 mJ/cm 2 to 3 J/cm 2 , particularly preferably 50 to 1000 mJ/cm 2 .
• it may be carried out under heating conditions.
• the alignment state of the liquid crystal compound in the optically anisotropic layer may be any of horizontal alignment, vertical alignment, tilted alignment, and twisted alignment, and is preferably fixed in a state of horizontal alignment with respect to the main surface of the optically anisotropic layer.
• horizontal alignment means that the main surface of the optically anisotropic layer (or the surface of the film substrate) is parallel to the longitudinal direction of the liquid crystal compound. It should be noted that it is not strictly required to be parallel, and in the present specification, it means an orientation in which the angle formed by the major axis direction of the liquid crystal compound and the main surface of the optically anisotropic layer is less than 10°.
• the angle formed by the major axis direction of the liquid crystal compound and the main surface of the optically anisotropic layer is preferably 0 to 5°, more preferably 0 to 3°, and even more preferably 0 to 2°.
• the optically anisotropic layer is preferably a positive A plate or a positive C plate, more preferably a positive C plate.
• a positive A plate (positive A plate) and a positive C plate (positive C plate) are defined as follows.
• nx is the refractive index in the in-plane slow axis direction (the direction in which the in-plane refractive index is maximized)
• ny is the refractive index in the direction orthogonal to the in-plane slow axis
• nz is the refractive index in the thickness direction
• the positive A plate satisfies the relationship of formula (A1)
• the positive C plate satisfies the relationship of formula (C1).
• the positive A plate shows a positive Rth value
• the positive C plate shows a negative Rth value.
• the thickness of the optically anisotropic layer is not particularly limited, it is preferably 0.1 ⁇ m or more, more preferably 0.2 ⁇ m or more.
• the upper limit is not particularly limited, it is preferably 10 ⁇ m or less, more preferably 8 ⁇ m or less, from the viewpoint of ensuring the flexibility of the optical layered body.
• a polarizing plate of the present invention is a polarizing plate having a polarizer and the above-described optical layered body of the present invention.
• the polarizer included in the polarizing plate of the present invention is not particularly limited as long as it is a member having a function of converting light into specific linearly polarized light, and conventionally known absorptive polarizers and reflective polarizers can be used.
• As the absorbing polarizer an iodine-based polarizer, a dye-based polarizer using a dichroic dye, a polyene-based polarizer, or the like is used.
• Iodine-based polarizers and dye-based polarizers include coated polarizers and stretched polarizers, both of which can be applied, but polarizers produced by adsorbing iodine or a dichroic dye to polyvinyl alcohol and stretching are preferred.
• polarizers produced by adsorbing iodine or a dichroic dye to polyvinyl alcohol and stretching are preferred.
• Japanese Patent No. 5048120, Japanese Patent No. 5143918, Japanese Patent No. 4691205, Japanese Patent No. 4751481, and Japanese Patent No. 4751486 can be mentioned, and known techniques related to these polarizers can also be preferably used.
• a polarizer in which thin films having different birefringences are laminated a wire grid polarizer, a polarizer in which a cholesteric liquid crystal having a selective reflection region and a quarter wavelength plate are combined, and the like are used.
• a polarizer containing a polyvinyl alcohol-based resin a polymer containing —CH 2 —CHOH— as a repeating unit, particularly at least one selected from the group consisting of polyvinyl alcohol and ethylene-vinyl alcohol copolymer is preferable in terms of better adhesion.
• the thickness of the polarizer is not particularly limited in the present invention, it is preferably 3 ⁇ m to 60 ⁇ m, more preferably 3 ⁇ m to 30 ⁇ m, even more preferably 3 ⁇ m to 10 ⁇ m.
• the image display device of the present invention is an image display device having the optical laminate of the present invention or the polarizing plate of the present invention.
• the display element used in the image display device of the present invention is not particularly limited, and examples thereof include liquid crystal cells, organic electroluminescence (hereinafter abbreviated as "EL") display panels, and plasma display panels. Among these, liquid crystal cells and organic EL display panels are preferable, and liquid crystal cells are more preferable. That is, the image display device of the present invention is preferably a liquid crystal display device using a liquid crystal cell as a display element, an organic EL display device using an organic EL display panel as a display element, and more preferably a liquid crystal display device.
• a liquid crystal display device which is an example of the image display device of the present invention, is a liquid crystal display device having the above-described polarizing plate of the present invention and a liquid crystal cell.
• the polarizing plates provided on both sides of the liquid crystal cell, it is preferable to use the polarizing plate of the present invention as the front-side polarizing plate, and it is more preferable to use the polarizing plate of the present invention as the front-side and rear-side polarizing plates.
• the liquid crystal cell constituting the liquid crystal display device will be described in detail below.
• Liquid crystal cells used in liquid crystal display devices are preferably in VA (Vertical Alignment) mode, OCB (Optically Compensated Bend) mode, IPS (In-Plane-Switching) mode, FFS (Fringe-Field-Switching) mode, or TN (Twisted Nematic) mode, but are limited to these. not.
• VA Vertical Alignment
• OCB Optically Compensated Bend
• IPS In-Plane-Switching
• FFS Feringe-Field-Switching
• TN Transmission Nematic
• the rod-like liquid crystal molecules are substantially horizontally oriented when no voltage is applied, and are twisted at 60 to 120°.
• TN mode liquid crystal cells are most commonly used as color TFT liquid crystal display devices, and are described in many documents.
• VA mode liquid crystal cells include (1) narrowly defined VA mode liquid crystal cells in which rod-like liquid crystal molecules are aligned substantially vertically when no voltage is applied and substantially horizontally aligned when voltage is applied (described in Japanese Patent Laid-Open No. 2-176625); 997) 845), (3) a liquid crystal cell in a mode (n-ASM mode) in which rod-like liquid crystalline molecules are substantially vertically aligned when no voltage is applied and twisted and multi-domain aligned when a voltage is applied (described in Proceedings of the Japan Liquid Crystal Forum 58-59 (1998)), and (4) a survival mode liquid crystal cell (presented at LCD International 98).
• any of PVA (Patterned Vertical Alignment) type, optical alignment type, and PSA (Polymer-Sustained Alignment) type may be used. Details of these modes are described in Japanese Unexamined Patent Application Publication No. 2006-215326 and Japanese National Publication of International Patent Application No. 2008-538819.
• the rod-like liquid crystal molecules are aligned substantially parallel to the substrate, and the liquid crystal molecules respond planarly by applying an electric field parallel to the substrate surface.
• a black display is obtained when no electric field is applied, and the absorption axes of the pair of upper and lower polarizing plates are perpendicular to each other.
• a method of using an optical compensatory sheet to reduce leakage light during black display in an oblique direction and improve the viewing angle is disclosed in Japanese Patent Laid-Open Nos. 10-54982, 11-202323, 9-292522, 11-133408, 11-305217, and 10-307291.
• Organic EL display device As an organic EL display device which is an example of the image display device of the present invention, for example, a polarizer, a ⁇ /4 plate (positive A plate) composed of the optically anisotropic layer of the present invention, and an organic EL display panel in this order from the viewing side. Also, the organic EL display panel is a display panel configured using an organic EL element in which an organic light-emitting layer (organic electroluminescence layer) is sandwiched between electrodes (between a cathode and an anode).
• the configuration of the organic EL display panel is not particularly limited, and a known configuration is adopted.
• the composition was heated with hot air at 70°C for 90 seconds, and then irradiated with ultraviolet rays (300 mJ/cm 2 ) at 40°C with an oxygen concentration of 0.1% under a nitrogen purge to fix the orientation of the liquid crystal compound to form an optically anisotropic layer.
• the retardation of the obtained laminate 1 was measured, the in-plane retardation Re (550) was 125 nm, and the thickness direction retardation Rth (550) was -25 nm. Also, Re(450)/Re(550) was 1.01, and Rth(450)/Rth(550) was 1.06.
• Polymerizable liquid crystal composition 1 100.0 parts by mass of liquid crystal compound L1 below, 5.0 parts by mass of photopolymerization initiator S1 below, 2.0 parts by mass of photopolymerization initiator S2 below, 2.0 parts by mass of alignment aid A1 below, 4.5 parts by mass of compound B1 below, 8.0 parts by mass of compound C1 below (A-TMMT, manufactured by Shin-Nakamura Chemical Co., Ltd.), 0.4 parts by mass of leveling agent P1 below, 0.5 parts by mass of leveling agent P2 below, and 426 parts by mass of acetone .0 parts by mass PGMEA 49.0 parts by mass Methanol 14.7 parts by mass ⁇
• Liquid crystal compound L1 A mixture of 83:15:2 (mass ratio) of the following liquid crystal compounds (RA) (RB) (RC)
• the in-plane retardation Re (550) was 125 nm
• the thickness direction retardation Rth (550) was -25 nm.
• Re(450)/Re(550) was 1.01
• Rth(450)/Rth(550) was 1.06
• SK1478 (thickness: 25 ⁇ m, manufactured by Soken Kagaku Co., Ltd.) was laminated as an adhesive layer on the surface of the barrier layer in the produced laminate 2, and an optical laminate 1 was produced by laminating an optically anisotropic layer, a film substrate, a barrier layer and an adhesive layer in this order.
• Example 2 to 10 and Comparative Examples 1 to 3 An optical laminate was produced in the same manner as in Example 1, except that the monomers 1, 2 and leveling agent contained in the composition for forming a barrier layer were changed to the compounds shown in Table 2 below.
• the optical layered bodies produced in Examples 1 to 10 and Comparative Examples 1 to 3 were evaluated for adhesion and display performance shown below. These results are shown in Table 2 below. In Table 2 below, in the columns of condition 1 and condition 2, "A" indicates that the condition is satisfied, and "B” indicates that the condition is not satisfied. In addition, whether the barrier layers of the optical laminates produced in Examples 1 to 10 and Comparative Examples 1 to 3 exhibit liquid crystallinity was confirmed according to the method described above. As a result, it was confirmed that the barrier layers other than those of Example 9 did not exhibit liquid crystallinity.
• a core layer cellulose acylate dope 1 was prepared by putting the following composition into a mixing tank and stirring to dissolve each component.
• Core layer cellulose acylate dope 1 ⁇ ⁇ Cellulose acetate having a degree of acetyl substitution of 2.88 100 parts by mass ⁇ Ester oligomer (Compound 1-1 below) 10 parts by mass ⁇ Durability improver (Compound 1-2 below) 4 parts by mass ⁇ Ultraviolet absorber (Compound 1-3 below) 3 parts by mass ⁇ Methylene chloride (first solvent) 438 parts by mass ⁇ Methanol (second solvent) 65 parts by mass ⁇
• Matting agent solution ⁇ ⁇ Silica particles with an average particle size of 20 nm (AEROSIL R972, manufactured by Nippon Aerosil Co., Ltd.) 2 parts by mass ⁇ Methylene chloride (first solvent) 76 parts by mass ⁇ Methanol (second solvent) 11 parts by mass ⁇ Core layer cellulose acylate dope 1 1 part by mass ⁇
• a hard coat curable composition shown in the table below was prepared.
• UV initiator 1 In Table 1 above, the structure of UV initiator 1 is shown below.
• the curable composition for hard coating was applied onto the surface of the protective film 1 prepared above, then dried at 100° C. for 60 seconds and irradiated with UV at 1.5 kW and 300 mJ under conditions of 0.1% nitrogen or less to cure to prepare a protective film 1 with a hard coat layer having a hard coat layer with a thickness of 5 ⁇ m.
• the film thickness of the hard coat layer was adjusted by adjusting the coating amount in the die coating method using a slot die.
• the aforementioned PMMA dope was uniformly cast onto a stainless steel band (casting support) from a casting die (band casting machine).
• the film was peeled off when the solvent content in the casting film was approximately 20% by mass, and both ends of the film in the width direction were fixed with tenter clips. After that, the obtained film was further dried by conveying it between rolls of a heat treatment apparatus, and a PMMA film having a thickness of 20 ⁇ m was produced as a protective film 2 .
• Adhesive composition 1 was prepared by mixing the following compounds at the stated ratio.
• Polymerizable compound (Aronix M-220, manufactured by Toa Gosei Co., Ltd.): 20 parts by mass Polymerizable compound (4-hydroxybutyl acrylate, manufactured by Nippon Kasei Co., Ltd.): 40 parts by mass Polymerizable compound (-2-ethylhexyl acrylate, manufactured by Mitsubishi Chemical Corporation): 40 parts by mass Polymerizable initiator (Irgacure 907, manufactured by BASF): 1.5 parts by mass Sensitizer (KAYACURE DETX-S, Nippon Kayaku Co., Ltd.): 0.5 parts by mass
• Second polarizing plate The polarizer-laminated surface of the protective film 2 was subjected to corona treatment at a discharge amount of 150 W ⁇ min/m 2 , and then the adhesive composition 1 was applied so as to have a film thickness of 0.5 ⁇ m. After that, the adhesive coated surface was attached to the polarizer surface of the polarizing plate 1 with a protective film on one side, and the substrate side of the protective film 2 was irradiated with 300 mJ/cm 2 of ultraviolet rays at 40° C. in an air atmosphere. After that, it was dried at 60° C. for 3 minutes to prepare a second polarizing plate.
• the liquid crystal cell in the liquid crystal display device included a color filter layer on the substrate on the first polarizing plate side and a TFT layer on the substrate on the second polarizing plate side.
• the ⁇ n ⁇ d of the liquid crystal compound in the liquid crystal cell was 340, and the tilt angle between the liquid crystal compound and the substrate surface was 0.1°.
• Black luminance and chromaticity were measured in a dark room using a measuring instrument (EZ-Contrast XL88, manufactured by ELDIM) when black was displayed on the liquid crystal display device. Specifically, for black luminance, the average value of luminance at azimuth angles of 45°, 135°, 225°, and 315° at a polar angle of 60° was measured as light leakage Y, and chromaticity was calculated at 15° intervals from 0° to 345° at an azimuth angle of 60°, and evaluated according to the following criteria.
• A-TMMT (manufactured by Shin-Nakamura Chemical Co., Ltd.)
• Liquid crystal compound L1 A mixture of 83:15:2 (mass ratio) of the following liquid crystal compounds (RA) (RB) (RC)

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