WO2018221319A1 - 光学積層体、偏光フィルムおよび画像表示装置 - Google Patents

光学積層体、偏光フィルムおよび画像表示装置 Download PDF

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Publication number
WO2018221319A1
WO2018221319A1 PCT/JP2018/019651 JP2018019651W WO2018221319A1 WO 2018221319 A1 WO2018221319 A1 WO 2018221319A1 JP 2018019651 W JP2018019651 W JP 2018019651W WO 2018221319 A1 WO2018221319 A1 WO 2018221319A1
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Prior art keywords
polarizer
optical laminate
layer
film
substrate
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PCT/JP2018/019651
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English (en)
French (fr)
Japanese (ja)
Inventor
康隆 石原
岸　敦史
友徳 上野
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日東電工株式会社
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Priority to CN201880036639.1A priority Critical patent/CN110720063B/zh
Priority to KR1020197033741A priority patent/KR102575467B1/ko
Publication of WO2018221319A1 publication Critical patent/WO2018221319A1/ja

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    • 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
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • 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
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/08—Processes
    • C08G18/10—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
    • C08G18/72—Polyisocyanates or polyisothiocyanates
    • C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
    • C08G18/76—Polyisocyanates or polyisothiocyanates cyclic aromatic
    • C08G18/7614—Polyisocyanates or polyisothiocyanates cyclic aromatic containing only one aromatic ring
    • C08G18/7621—Polyisocyanates or polyisothiocyanates cyclic aromatic containing only one aromatic ring being toluene diisocyanate including isomer mixtures
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
    • C08G18/72—Polyisocyanates or polyisothiocyanates
    • C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
    • C08G18/76—Polyisocyanates or polyisothiocyanates cyclic aromatic
    • C08G18/7657—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings
    • C08G18/7664—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings containing alkylene polyphenyl groups
    • C08G18/7671—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings containing alkylene polyphenyl groups containing only one alkylene bisphenyl group
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
    • C09D175/04—Polyurethanes
    • 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
    • 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
    • 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
    • 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
    • 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

Definitions

  • the present invention relates to an optical laminate in which a polarizer is bonded through an adhesive layer. Moreover, this invention relates to the polarizing film used for the said optical laminated body.
  • the optical laminate can be used alone or in combination with another optical film to form an image display device such as a liquid crystal display (LCD) or an organic EL display.
  • polarizing films In a liquid crystal display device, it is indispensable to dispose polarizing films on both sides of a glass substrate that forms the surface of a liquid crystal panel because of its image forming method.
  • a polarizing film in which a protective film is bonded to one or both sides of a polarizer made of a dichroic material such as a polyvinyl alcohol film and iodine with a polyvinyl alcohol adhesive or the like is used. .
  • Patent Documents 1 and 2 describe that the direct transmittance of the polarizing film can be maintained even at high temperatures.
  • An object of the present invention is to provide an optical laminate that can suppress a decrease in optical characteristics even in a high-temperature and high-humidity environment. Moreover, an object of this invention is to provide the polarizing film used for the said optical laminated body.
  • the present invention is an optical laminate in which a polarizer is bonded to a substrate containing an ionic component via an adhesive layer, The substrate elutes an ionic component to the pressure-sensitive adhesive layer side, and
  • the present invention relates to an optical layered body having a transparent block layer that suppresses migration of the ionic component toward the polarizer between the polarizer and the substrate.
  • examples of the substrate include an alkali glass substrate.
  • the present invention is suitable when the amount of sodium ions detected from the water used for boiling when the substrate is boiled in hot water at 120 ° C. for 1 hour is 0.01 ⁇ g / g. Applies to
  • the transparent block layer may be formed directly on the polarizer or the substrate.
  • the thickness of the polarizer is preferably 10 ⁇ m or less.
  • the transparent block layer preferably has a thickness of 3 ⁇ m or less.
  • a cured product of a forming material containing a urethane prepolymer that is a reaction product of an isocyanate compound and a polyhydric alcohol can be used.
  • the isocyanate compound it is preferable to use at least one selected from tolylene diisocyanate and diphenylmethane diisocyanate.
  • the polarizer may have a protective film on one side opposite to the side having the transparent block layer.
  • the present invention is a polarizing film used in the optical laminate,
  • the present invention relates to a polarizing film comprising a polarizer and a transparent block layer formed directly on the polarizer.
  • the present invention also relates to an image display device having the optical laminate.
  • a polarizer can be used as an optical laminate bonded to various substrates via an adhesive layer, but depending on the substrate, as described above, components such as ions that become impurities in a high-temperature and high-humidity environment. May be eluted. And the said elution component penetrate
  • the optical layered body of the present invention has a transparent block layer between the polarizer and the substrate that suppresses the migration of the eluted component to the polarizer side.
  • the said transparent block layer can prevent that the elution component from the said board
  • the optical laminate of the present invention has a polarizer P bonded to the substrate 2 via an adhesive layer 3, and a transparent block layer between the polarizer P and the substrate 2.
  • the transparent block layer 1 can be directly provided on the polarizer P or the substrate 2. 1 to 4 illustrate the case where the transparent block layer 1 is provided only on one side of the polarizer P, the transparent block layer 1 can be provided on both sides of the polarizer P.
  • FIG. 3 is a case where the transparent block layer 1 is between the polarizer P and the pressure-sensitive adhesive layer 3.
  • the transparent block layer 1 can be directly provided on the polarizer P.
  • a polarizing film having a polarizer P and a transparent block layer 1 directly formed on the polarizer P can be prepared.
  • surface opposite to the side which has the said transparent block layer in the polarizer P can be prepared.
  • the laminated optical body of FIGS. 2 and 4 is a case where the transparent block layer 1 is between the pressure-sensitive adhesive layer 3 and the substrate 2. 2 and 4, the transparent block layer 1 can be provided directly on the substrate 2.
  • the optical layered body of the present invention can be provided with a protective film 4 on the polarizer P as shown in FIGS.
  • the optical laminated body of FIG. 3, FIG. 4 is a case where the protective film 4 is provided in the optical laminated body of FIG. 1, FIG.
  • the polarizer P and the protective film 4 are laminated via intervening layers such as an adhesive layer, a pressure-sensitive adhesive layer, and an undercoat layer (primer layer).
  • the said easily bonding layer and an adhesive bond layer can be laminated
  • an optical layer or an optical member other than the transparent block layer 1 may be an adhesive layer or It can be laminated via an adhesive layer. Even when the optical layer or the optical member is one in which an elution component is generated under humidified heat conditions, the present invention prevents the elution component from shifting to a polarizer and suppresses deterioration of optical properties. It is valid.
  • the optical laminate of the present invention can be appropriately provided with a surface protective film.
  • the polarizer is not particularly limited, and various types can be used.
  • polarizers include dichroic iodine and dichroic dyes on hydrophilic polymer films such as polyvinyl alcohol films, partially formalized polyvinyl alcohol films, and ethylene / vinyl acetate copolymer partially saponified films.
  • hydrophilic polymer films such as polyvinyl alcohol films, partially formalized polyvinyl alcohol films, and ethylene / vinyl acetate copolymer partially saponified films.
  • examples thereof include polyene-based oriented films such as those obtained by adsorbing substances and uniaxially stretched, polyvinyl alcohol dehydrated products and polyvinyl chloride dehydrochlorinated products.
  • a polarizer composed of a polyvinyl alcohol film and a dichroic substance such as iodine is preferable.
  • the thickness of these polarizers is not particularly limited, but is generally about 80 ⁇ m or less.
  • a polarizer obtained by dyeing a polyvinyl alcohol film with iodine and uniaxially stretching it can be prepared, for example, by dyeing a polyvinyl alcohol film in an aqueous solution of iodine and stretching it 3 to 7 times the original length. it can. If necessary, it can be immersed in an aqueous solution of potassium iodide or the like which may contain boric acid, zinc sulfate, zinc chloride or the like. Further, if necessary, the polyvinyl alcohol film may be immersed in water and washed before dyeing.
  • the polyvinyl alcohol film In addition to washing the polyvinyl alcohol film surface with stains and antiblocking agents by washing the polyvinyl alcohol film with water, the polyvinyl alcohol film is also swollen to prevent unevenness such as uneven coloring. is there. Stretching may be performed after dyeing with iodine, may be performed while dyeing, or may be dyed with iodine after stretching. The film can be stretched even in an aqueous solution of boric acid or potassium iodide or in a water bath.
  • a polarizer having a thickness of 10 ⁇ m or less can be used.
  • the thickness of the polarizer is preferably 8 ⁇ m or less from the viewpoint of thinning, more preferably 7 ⁇ m or less, and further preferably 6 ⁇ m or less.
  • the thickness of the polarizer is preferably 2 ⁇ m or more, and more preferably 3 ⁇ m or more.
  • Such a thin polarizer has less thickness unevenness, excellent visibility, and less dimensional change, and therefore excellent durability against thermal shock.
  • Patent No. 4751486 Japanese Patent No. 4751481, Patent No. 4815544, Patent No. 5048120, International Publication No. 2014/077599 pamphlet, International Publication No. 2014/077636 Pamphlet, And the thin polarizers obtained from the production methods described therein.
  • the polarizer has an optical characteristic expressed by a single transmittance T and a polarization degree P of the following formula P> ⁇ (10 0.929T-42.4 ⁇ 1) ⁇ 100 (where T ⁇ 42.3), Or It is configured to satisfy the condition of P ⁇ 99.9 (however, T ⁇ 42.3).
  • a polarizer configured so as to satisfy the above-described conditions uniquely has performance required as a display for a liquid crystal television using a large display element. Specifically, the contrast ratio is 1000: 1 or more and the maximum luminance is 500 cd / m 2 or more. As other uses, for example, it is bonded to the viewing side of the organic EL display device.
  • Patent No. 4751486, Patent in that it can be stretched at a high magnification and the polarization performance can be improved.
  • stretching in a boric-acid aqueous solution as described in the 4751481 specification and the patent 4815544 specification is preferable, and it describes especially in the patent 4751481 specification and the patent 4815544 specification.
  • stretching in the boric-acid aqueous solution which has this is preferable.
  • These thin polarizers can be obtained by a production method including a step of stretching a polyvinyl alcohol-based resin (hereinafter also referred to as PVA-based resin) layer and a stretching resin base material in a laminated state and a step of dyeing.
  • PVA-based resin polyvinyl alcohol-based resin
  • a stretching resin base material in a laminated state
  • dyeing a step of dyeing
  • a substrate is used as an ionic component.
  • substrate elutes an ionic component to the adhesive layer side.
  • the optical laminate of the present invention is effective when such a substrate is used.
  • the elution component of the substrate can be confirmed by the following method and the method described in Examples.
  • Such a substrate capable of generating an elution component can be performed, for example, by detecting an ionic component from water used for boiling when the substrate is boiled in 120 ° C. hot water for 1 hour. When the amount of sodium ions detected is 0.01 ⁇ g / g, it can be confirmed that the substrate can generate an elution component.
  • the substrate may be a glass substrate.
  • the alkali glass substrate contains a sodium component, and it is detected that sodium ions are eluted.
  • Such an alkali glass substrate also includes chemically strengthened glass such as gorilla glass manufactured by Corning, which is used as a cover glass in a display device.
  • the thickness of the substrate is usually about 1 to 5000 ⁇ m, preferably 300 to 2000 ⁇ m.
  • Transparent block layer a layer that can prevent the migration of the eluted components from the substrate is used.
  • the thickness of the transparent block layer is preferably 3 ⁇ m or less, more preferably 2 ⁇ m or less, further preferably 1.5 ⁇ m or less, from the viewpoint of thinning and optical reliability. Is preferably 1 ⁇ m or less.
  • the thickness of the transparent block layer is preferably 0.1 ⁇ m or more, more preferably 0.2 ⁇ m or more, and further preferably 0.3 ⁇ m or more from the viewpoint of exhibiting sufficient block property. .
  • a material having transparency and capable of preventing migration of eluted components can be used.
  • examples of such a material include a forming material containing a urethane prepolymer which is a reaction product of an isocyanate compound and a polyhydric alcohol.
  • a polyfunctional isocyanate compound for example, a polyfunctional isocyanate compound is preferable, and specific examples include a polyfunctional aromatic isocyanate compound, an alicyclic isocyanate compound, an aliphatic isocyanate compound, or a dimer thereof.
  • polyfunctional aromatic isocyanate compound examples include phenylene diisocyanate, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 2,2′-diphenylmethane diisocyanate, 4,4′-diphenylmethane diisocyanate, 4 4,4'-toluidine diisocyanate, 4,4'-diphenyl ether diisocyanate, 4,4'-diphenyl diisocyanate, 1,5-naphthalene diisocyanate, xylylene diisocyanate, methylene bis 4-phenyl isocyanate, p-phenylene diisocyanate, and the like.
  • polyfunctional alicyclic isocyanate compound examples include 1,3-cyclopentene diisocyanate, 1,3-cyclohexane diisocyanate, 1,4-cyclohexane diisocyanate, 1,3-bisisocyanatomethylcyclohexane, isophorone diisocyanate, hydrogen Added diphenylmethane diisocyanate, hydrogenated xylylene diisocyanate, hydrogenated tolylene diisocyanate, hydrogenated tetramethylxylylene diisocyanate, and the like.
  • polyfunctional aliphatic isocyanate compound examples include trimethylene diisocyanate, tetramethylene diisocyanate, hexamethylene diisocyanate, pentamethylene diisocyanate, 1,2-propylene diisocyanate, 1,3-butylene diisocyanate, dodecamethylene diisocyanate, 2,4,4 Examples include 4-trimethylhexamethylene diisocyanate.
  • polyfunctional isocyanate compound examples include those having three or more isocyanate groups such as isocyanuric acid tris (6-inocyanate hexyl).
  • polyhydric alcohol examples include ethylene glycol, diethylene glycol, 1,3-butanediol, 1,4-butanediol, neopentyl glycol, 3-methyl-1,5-pentanediol, 2-butyl-2-ethyl- 1,3-propanediol, 2,4-diethyl-1,5-pentanediol, 1,2-hexanediol, 1,6-hexanediol, 1,8-octanediol, 1,9-nonanediol, 2- Examples thereof include methyl-1,8-octanediol, 1,8-decanediol, octadecanediol, glycerin, trimethylolpropane, pentaerythritol, hexanetriol, and polypropylene glycol.
  • the polyfunctional isocyanate compound can be used alone or in combination of two or more, but an aromatic isocyanate compound is preferred from the viewpoint of adjusting the moisture content.
  • Other polyfunctional isocyanate compounds can be used in combination with aromatic isocyanate compounds.
  • trimethylolpropane-tri-tolylene isocyanate and trimethylolpropane-tri-diphenylmethane diisocyanate are preferably used.
  • the urethane prepolymer having a terminal isocyanate group with a protecting group may be used.
  • Protecting groups include oximes and lactams.
  • the protecting group is dissociated from the isocyanate group by heating, and the isocyanate group reacts.
  • a reaction catalyst can be used to increase the reactivity of the isocyanate group.
  • the reaction catalyst is not particularly limited, but a tin-based catalyst or an amine-based catalyst is suitable.
  • the reaction catalyst can use 1 type (s) or 2 or more types.
  • the amount of the reaction catalyst used is usually 5 parts by weight or less with respect to 100 parts by weight of the urethane prepolymer. When the amount of the reaction catalyst is large, the crosslinking reaction rate increases and foaming of the forming material occurs. Even if the forming material after foaming is used, sufficient adhesion cannot be obtained.
  • a reaction catalyst it is preferably 0.01 to 5 parts by weight, more preferably 0.05 to 4 parts by weight.
  • the tin-based catalyst both inorganic and organic catalysts can be used, but an organic catalyst is preferred.
  • the inorganic tin-based catalyst include stannous chloride and stannic chloride.
  • the organic tin-based catalyst is preferably one having at least one organic group such as an aliphatic group or alicyclic group having a skeleton such as a methyl group, an ethyl group, an ether group or an ester group. Examples include tetra-n-butyltin, tri-n-butyltin acetate, n-butyltin trichloride, trimethyltin hydroxide, dimethyltin dichloride, dibutyltin dilaurate and the like.
  • the amine catalyst is not particularly limited. For example, those having at least one organic group such as an alicyclic group such as quinoclidine, amidine, and diazabicycloundecene are preferable.
  • examples of the amine catalyst include triethylamine.
  • reaction catalysts other than the above include cobalt naphthenate and benzyltrimethylammonium hydroxide.
  • the urethane prepolymer is usually used as a solution.
  • the solution may be a solvent system or an aqueous system such as an emulsion, a colloidal dispersion, or an aqueous solution.
  • the organic solvent is not particularly limited as long as the components constituting the forming material are uniformly dissolved. Examples of the organic solvent include toluene, methyl ethyl ketone, ethyl acetate and the like.
  • alcohols such as n-butyl alcohol and isopropyl alcohol and ketones such as acetone can be blended.
  • a dispersant is used, a urethane prepolymer, a functional group having low reactivity with isocyanate groups such as carboxylate, sulfonate, and quaternary ammonium salt, and water dispersibility such as polyethylene glycol. This can be done by introducing the components.
  • Examples of the material forming the transparent block layer other than the urethane prepolymer include cyanoacrylate-based forming materials and epoxy-based forming materials.
  • the formation of the transparent block layer can be appropriately selected according to the type of the forming material, for example, can be performed by applying the forming material to a polarizer or a resin film and then curing.
  • the transparent block layer can be obtained as a coating layer. Usually, after the coating, it is carried out by forming a cured layer by drying at about 30 to 100 ° C., preferably at 50 to 80 ° C. for about 0.5 to 15 minutes. Furthermore, when the forming material contains an isocyanate component, annealing treatment is performed at about 30 to 100 ° C., preferably 50 to 80 ° C. for about 0.5 to 24 hours in order to promote the reaction. Can do.
  • ⁇ Adhesive layer> In the optical layered body of the present invention, as the pressure-sensitive adhesive layer used for bonding the polarizer, those used in the polarizing film can be adopted. Moreover, it can laminate
  • an appropriate pressure-sensitive adhesive can be used, and the type thereof is not particularly limited.
  • Adhesives include rubber adhesives, acrylic adhesives, silicone adhesives, urethane adhesives, vinyl alkyl ether adhesives, polyvinyl alcohol adhesives, polyvinyl pyrrolidone adhesives, polyacrylamide adhesives, Examples thereof include cellulose-based pressure-sensitive adhesives.
  • pressure-sensitive adhesives those having excellent optical transparency, suitable wettability, cohesiveness, and adhesive pressure characteristics, and excellent weather resistance and heat resistance are preferably used.
  • An acrylic pressure-sensitive adhesive is preferably used as one exhibiting such characteristics.
  • the pressure-sensitive adhesive layer for example, a method in which the pressure-sensitive adhesive is applied to a release-treated separator, the polymerization solvent is dried and removed to form a pressure-sensitive adhesive layer, and then transferred to the transparent block layer, or The pressure-sensitive adhesive is applied to the transparent block layer, and the polymerization solvent is dried and removed to form the pressure-sensitive adhesive layer on the polarizer.
  • one or more solvents other than the polymerization solvent may be added as appropriate.
  • a silicone release liner is preferably used as the release-treated separator.
  • an appropriate method may be adopted as appropriate according to the purpose.
  • a method of heating and drying the coating film is used.
  • the heating and drying temperature is preferably 40 ° C to 200 ° C, more preferably 50 ° C to 180 ° C, and particularly preferably 70 ° C to 170 ° C.
  • the drying time is preferably 5 seconds to 20 minutes, more preferably 5 seconds to 10 minutes, and particularly preferably 10 seconds to 5 minutes.
  • Various methods are used as a method for forming the pressure-sensitive adhesive layer. Specifically, for example, roll coat, kiss roll coat, gravure coat, reverse coat, roll brush, spray coat, dip roll coat, bar coat, knife coat, air knife coat, curtain coat, lip coat, die coater, etc. Examples thereof include an extrusion coating method.
  • the thickness of the pressure-sensitive adhesive layer is not particularly limited, and is, for example, about 1 to 100 ⁇ m.
  • the thickness is preferably 2 to 50 ⁇ m, more preferably 2 to 40 ⁇ m, and still more preferably 5 to 35 ⁇ m.
  • the pressure-sensitive adhesive layer When the pressure-sensitive adhesive layer is exposed, the pressure-sensitive adhesive layer may be protected with a peeled sheet (separator) until practical use.
  • constituent material of the separator examples include, for example, plastic films such as polyethylene, polypropylene, polyethylene terephthalate, and polyester films, porous materials such as paper, cloth, and nonwoven fabric, nets, foam sheets, metal foils, and laminates thereof.
  • plastic films such as polyethylene, polypropylene, polyethylene terephthalate, and polyester films
  • porous materials such as paper, cloth, and nonwoven fabric, nets, foam sheets, metal foils, and laminates thereof.
  • a thin film can be used, but a plastic film is preferably used because of its excellent surface smoothness.
  • the plastic film is not particularly limited as long as it can protect the pressure-sensitive adhesive layer.
  • a polyethylene film, a polypropylene film, a polybutene film, a polybutadiene film, a polymethylpentene film, a polyvinyl chloride film, and a vinyl chloride co-polymer are used.
  • examples thereof include a polymer film, a polyethylene terephthalate film, a polybutylene terephthalate film, a polyurethane film, and an ethylene-vinyl acetate copolymer film.
  • the thickness of the separator is usually about 5 to 200 ⁇ m, preferably about 5 to 100 ⁇ m.
  • mold release and antifouling treatment with a silicone type, fluorine type, long chain alkyl type or fatty acid amide type release agent, silica powder, etc., coating type, kneading type, vapor deposition type It is also possible to carry out antistatic treatment such as.
  • the release property from the pressure-sensitive adhesive layer can be further improved by appropriately performing a release treatment such as silicone treatment, long-chain alkyl treatment, or fluorine treatment on the surface of the separator.
  • a material excellent in transparency, mechanical strength, thermal stability, moisture barrier property, isotropy and the like is preferable.
  • polyester polymers such as polyethylene terephthalate and polyethylene naphthalate
  • cellulose polymers such as diacetyl cellulose and triacetyl cellulose
  • acrylic polymers such as polymethyl methacrylate
  • styrene such as polystyrene and acrylonitrile / styrene copolymer (AS resin)
  • AS resin acrylonitrile / styrene copolymer
  • polyethylene, polypropylene, polyolefins having a cyclo or norbornene structure, polyolefin polymers such as ethylene / propylene copolymers, vinyl chloride polymers, amide polymers such as nylon and aromatic polyamide, imide polymers, sulfone polymers , Polyether sulfone polymer, polyether ether ketone polymer, polyphenylene sulfide polymer, vinyl alcohol polymer, vinylidene chloride polymer, vinyl butyral polymer, arylate polymer, polyoxymethylene polymer, epoxy polymer, or the above Polymer blends and the like can also be mentioned as examples of the polymer forming the protective film.
  • the protective film is applied to the side opposite to the side to which the substrate is applied, based on the polarizer. Since it is optional to provide the transparent block layer of the present invention on the opposite side of the polarizer, it is preferable to use a material that does not generate an elution component even in a high-temperature and high-humidity environment as the protective film.
  • the material for such a protective film include acrylic polymers and polyolefin polymers.
  • thermoplastic resin in the protective film is preferably 50 to 100% by weight, more preferably 50 to 99% by weight, still more preferably 60 to 98% by weight, and particularly preferably 70 to 97% by weight.
  • content of the said thermoplastic resin in a protective film is 50 weight% or less, there exists a possibility that the high transparency etc. which a thermoplastic resin originally has cannot fully be expressed.
  • a retardation film As the protective film, a retardation film, a brightness enhancement film, a diffusion film, and the like can also be used.
  • the retardation film include those having a front retardation of 40 nm or more and / or a retardation having a thickness direction retardation of 80 nm or more.
  • the front phase difference is usually controlled in the range of 40 to 200 nm
  • the thickness direction phase difference is usually controlled in the range of 80 to 300 nm.
  • the retardation film functions also as a polarizer protective film, so that the thickness can be reduced.
  • the retardation film examples include a birefringent film obtained by uniaxially or biaxially stretching a thermoplastic substrate.
  • the stretching temperature, stretching ratio, and the like are appropriately set depending on the retardation value, film material, and thickness.
  • the thickness of the protective film can be appropriately determined, but is generally about 1 to 500 ⁇ m from the viewpoints of workability such as strength and handleability, and thin layer properties. In particular, it is preferably 1 to 300 ⁇ m, more preferably 5 to 200 ⁇ m, and further preferably 5 to 150 ⁇ m, particularly 20 to 100 ⁇ m.
  • a functional layer such as a hard coat layer, an antireflection layer, an antisticking layer, a diffusion layer or an antiglare layer can be provided on the surface of the protective film where the polarizer is not adhered.
  • the hard coat layer, the antireflection layer, the antisticking layer, the diffusion layer, the antiglare layer, and other functional layers can be provided on the protective film itself, or can be provided separately from the protective film. it can.
  • the protective film and the polarizer are laminated via an intervening layer such as an adhesive layer, an adhesive layer, and an undercoat layer (primer layer). At this time, it is desirable that the both are laminated without an air gap by an intervening layer.
  • an intervening layer such as an adhesive layer, an adhesive layer, and an undercoat layer (primer layer).
  • the adhesive layer is formed with an adhesive.
  • the type of the adhesive is not particularly limited, and various types can be used.
  • the adhesive layer is not particularly limited as long as it is optically transparent. Examples of the adhesive include water-based, solvent-based, hot-melt-based, active energy ray-curable types, and the like. Or an active energy ray hardening-type adhesive agent is suitable.
  • water-based adhesives examples include isocyanate-based adhesives, polyvinyl alcohol-based adhesives, gelatin-based adhesives, vinyl-based latex systems, and water-based polyesters.
  • the water-based adhesive is usually used as an adhesive composed of an aqueous solution, and usually contains 0.5 to 60% by weight of solid content.
  • the active energy ray curable adhesive is an adhesive that cures by an active energy ray such as an electron beam or ultraviolet rays (radical curable type, cationic curable type), for example, in an electron beam curable type or an ultraviolet curable type. Can be used.
  • an active energy ray such as an electron beam or ultraviolet rays (radical curable type, cationic curable type), for example, in an electron beam curable type or an ultraviolet curable type.
  • an active energy ray curable adhesive for example, a photo radical curable adhesive can be used.
  • the photo radical curable active energy ray curable adhesive is used as an ultraviolet curable adhesive, the adhesive contains a radical polymerizable compound and a photo polymerization initiator.
  • the adhesive coating method is appropriately selected depending on the viscosity of the adhesive and the target thickness.
  • coating methods include reverse coaters, gravure coaters (direct, reverse and offset), bar reverse coaters, roll coaters, die coaters, bar coaters, rod coaters and the like.
  • a method such as a dapping method can be appropriately used.
  • the adhesive is preferably applied so that the finally formed adhesive layer has a thickness of 30 to 300 nm.
  • the thickness of the adhesive layer is more preferably 60 to 250 nm.
  • the thickness of the adhesive layer is preferably 0.1 to 200 ⁇ m. More preferably, it is 0.5 to 50 ⁇ m, and still more preferably 0.5 to 10 ⁇ m.
  • an easily bonding layer can be provided between a protective film and an adhesive bond layer.
  • the easy adhesion layer can be formed of, for example, various resins having a polyester skeleton, a polyether skeleton, a polycarbonate skeleton, a polyurethane skeleton, a silicone-based, a polyamide skeleton, a polyimide skeleton, a polyvinyl alcohol skeleton, and the like. These polymer resins can be used alone or in combination of two or more. Moreover, you may add another additive for formation of an easily bonding layer. Specifically, a stabilizer such as a tackifier, an ultraviolet absorber, an antioxidant, and a heat resistance stabilizer may be used.
  • the easy-adhesion layer is usually provided in advance on a protective film, and the easy-adhesion layer side of the protective film and the polarizer are laminated with an adhesive layer.
  • the easy-adhesion layer is formed by applying and drying a material for forming the easy-adhesion layer on a protective film by a known technique.
  • the material for forming the easy-adhesion layer is usually adjusted as a solution diluted to an appropriate concentration in consideration of the thickness after drying and the smoothness of coating.
  • the thickness of the easy-adhesion layer after drying is preferably 0.01 to 5 ⁇ m, more preferably 0.02 to 2 ⁇ m, and still more preferably 0.05 to 1 ⁇ m. Note that a plurality of easy-adhesion layers can be provided, but also in this case, the total thickness of the easy-adhesion layers is preferably in the above range.
  • the pressure-sensitive adhesive layer is formed from a pressure-sensitive adhesive.
  • Various pressure-sensitive adhesives can be used as the pressure-sensitive adhesive, such as rubber-based pressure-sensitive adhesives, acrylic pressure-sensitive adhesives, silicone-based pressure-sensitive adhesives, urethane-based pressure-sensitive adhesives, vinyl alkyl ether-based pressure-sensitive adhesives, polyvinylpyrrolidone-based pressure-sensitive adhesives, Examples include acrylamide-based adhesives and cellulose-based adhesives.
  • An adhesive base polymer is selected according to the type of the adhesive.
  • acrylic pressure-sensitive adhesives are preferably used because they are excellent in optical transparency, exhibit appropriate wettability, cohesiveness, and adhesive pressure-sensitive adhesive properties, and are excellent in weather resistance and heat resistance.
  • the undercoat layer (primer layer) is formed to improve the adhesion between the polarizer and the protective film.
  • the material constituting the primer layer is not particularly limited as long as the material exhibits a certain degree of strong adhesion to both the base film and the polyvinyl alcohol-based resin layer.
  • a thermoplastic resin excellent in transparency, thermal stability, stretchability, etc. is used.
  • the thermoplastic resin include an acrylic resin, a polyolefin resin, a polyester resin, a polyvinyl alcohol resin, or a mixture thereof.
  • a surface protective film can be provided in the optical layered body of the present invention.
  • the surface protective film usually has a base film and an adhesive layer, and protects the polarizer via the adhesive layer.
  • a film material having isotropic property or close to isotropic property is selected from the viewpoints of inspection property and manageability.
  • film materials include polyester resins such as polyethylene terephthalate film, cellulose resins, acetate resins, polyether sulfone resins, polycarbonate resins, polyamide resins, polyimide resins, polyolefin resins, acrylic resins, and the like. Examples thereof include transparent polymers such as resins. Of these, polyester resins are preferred.
  • the base film can be used as a laminate of one kind or two or more kinds of film materials, and a stretched product of the film can also be used.
  • the thickness of the base film is generally 500 ⁇ m or less, preferably 10 to 200 ⁇ m.
  • the pressure-sensitive adhesive that forms the pressure-sensitive adhesive layer of the surface protective film includes a (meth) acrylic polymer, a silicone-based polymer, a polyester, a polyurethane, a polyamide, a polyether, a fluorine-based or a rubber-based pressure-sensitive adhesive. Can be appropriately selected and used. From the viewpoints of transparency, weather resistance, heat resistance and the like, an acrylic pressure-sensitive adhesive having an acrylic polymer as a base polymer is preferable.
  • the thickness (dry film thickness) of the pressure-sensitive adhesive layer is determined according to the required adhesive force. Usually, it is about 1 to 100 ⁇ m, preferably 5 to 50 ⁇ m.
  • the surface protective film can be provided with a release treatment layer on the surface opposite to the surface on which the pressure-sensitive adhesive layer is provided on the base film, using a low adhesion material such as silicone treatment, long-chain alkyl treatment, or fluorine treatment. .
  • the optical laminate of the present invention can be used by laminating other optical layers other than the polarizer.
  • the optical layer is not particularly limited.
  • a liquid crystal display device such as a reflection plate, a semi-transmission plate, a retardation plate (including wavelength plates such as 1/2 and 1/4), and a viewing angle compensation film.
  • One or more optical layers that may be used can be used.
  • the polarizer of the present invention is further laminated with a protective polarizing film (resin film), a reflective plate or a semi-transmissive reflective plate, or a reflective polarizing film or a semi-transmissive polarizing film.
  • An elliptically polarizing film or a circularly polarizing film thus formed, a wide viewing angle polarizing film in which a viewing angle compensation film is further laminated on the polarizing film, or a polarizing film in which a brightness enhancement film is further laminated on the polarizing film are preferable.
  • An optical laminate in which the above optical layer is laminated on a polarizer can be formed by a method of sequentially laminating separately in the manufacturing process of a liquid crystal display device or the like.
  • an appropriate adhesive means such as a pressure-sensitive adhesive layer can be used.
  • the optical laminate of the present invention can be preferably used for forming various image display devices such as liquid crystal display devices and organic EL display devices.
  • the liquid crystal display device can be formed according to the conventional method. That is, a liquid crystal display device is generally formed by appropriately assembling components such as a liquid crystal cell, a polarizing film or an optical film, and an illumination system as necessary, and incorporating a drive circuit. There is no limitation in particular except the point which uses the optical laminated body by invention, and it can apply according to the former.
  • As the liquid crystal cell an arbitrary type such as an IPS type or a VA type can be used, but is particularly suitable for the IPS type.
  • Appropriate liquid crystal display devices such as a liquid crystal display device in which an optical layered body is disposed on one side or both sides of a liquid crystal cell, or a backlight or reflector used in an illumination system can be formed.
  • the optical laminated body by this invention can be installed in the one side or both sides of a liquid crystal cell.
  • a polarizing film or an optical film on both sides they may be the same or different.
  • a liquid crystal display device for example, a single layer or a suitable part such as a diffusing plate, an antiglare layer, an antireflection film, a protective plate, a prism array, a lens array sheet, a light diffusing plate, a backlight, etc. Two or more layers can be arranged.
  • the optical laminated body of this invention is applicable to the cover glass of an image display apparatus.
  • the optical laminate of the present invention can be applied to a liquid crystal substrate, a resin film, and the like of an image display device.
  • IPA copolymerized PET amorphous isophthalic acid copolymerized polyethylene terephthalate (IPA copolymerized PET) film (thickness: 100 ⁇ m) having a water absorption of 0.75% and Tg of 75 ° C. is subjected to corona treatment.
  • Alcohol polymerization degree 4200, saponification degree 99.2 mol%) and acetoacetyl-modified PVA (polymerization degree 1200, acetoacetyl modification degree 4.6%, saponification degree 99.0 mol% or more, manufactured by Nippon Synthetic Chemical Industry Co., Ltd.
  • aqueous solution containing 9: 1 ratio of the trade name “Gosefimer Z200”) was applied and dried at 25 ° C. to form a PVA-based resin layer having a thickness of 11 ⁇ m, thereby preparing a laminate.
  • the obtained laminate was uniaxially stretched in the longitudinal direction (longitudinal direction) 2.0 times between rolls having different peripheral speeds in an oven at 120 ° C. (air-assisted stretching process).
  • the laminate was immersed in an insolubilization bath (a boric acid aqueous solution obtained by blending 4 parts by weight of boric acid with respect to 100 parts by weight of water) for 30 seconds (insolubilization treatment).
  • boric acid aqueous solution obtained by blending 3 parts by weight of potassium iodide and 3 parts by weight of boric acid with respect to 100 parts by weight of water.
  • Crosslinking treatment Thereafter, the laminate was immersed in a boric acid aqueous solution (an aqueous solution obtained by blending 4 parts by weight of boric acid and 5 parts by weight of potassium iodide with respect to 100 parts by weight of water) at a liquid temperature of 70 ° C.
  • uniaxial stretching was performed between rolls having different peripheral speeds in the longitudinal direction (longitudinal direction) so that the total stretching ratio was 5.5 times (in-water stretching treatment).
  • the laminate was immersed in a cleaning bath (an aqueous solution obtained by blending 4 parts by weight of potassium iodide with respect to 100 parts by weight of water) at a liquid temperature of 30 ° C. (cleaning treatment).
  • a cleaning bath an aqueous solution obtained by blending 4 parts by weight of potassium iodide with respect to 100 parts by weight of water
  • cleaning treatment a liquid temperature of 30 ° C.
  • Acrylic A (meth) acrylic substrate having a lactone ring structure with a thickness of 40 ⁇ m was subjected to corona treatment on the easy adhesion treated surface.
  • TAC manufactured by Fuji Film Co., Ltd., product name “TJ40”, and a 40 ⁇ m thick triacetyl cellulose resin film was used.
  • COP manufactured by Nippon Zeon Co., Ltd., product name “ZEONOR FILM”, 25 ⁇ m thick cycloolefin resin film was used.
  • the surface of the polarizer of the optical film laminate is coated with the protective film (acrylic) while applying the UV-curable adhesive so that the thickness of the adhesive layer after curing is 1 ⁇ m.
  • the protective film acrylic
  • UV-curable adhesive As energy rays, ultraviolet rays were irradiated to cure the adhesive. Ultraviolet irradiation is performed using a gallium-encapsulated metal halide lamp, an irradiation device: Fusion UV Systems, Inc.
  • Forming material A Dioctyltin dilaurate catalyst (trade name, manufactured by Tokyo Fine Chemical Co., Ltd.) in 100 parts of a 75% ethyl acetate solution of urethane prepolymer composed of tolylene diisocyanate and trimethylolpropane (trade name “Coronate L” manufactured by Tosoh Corporation) 0.1 parts of “Enabilizer OL-1” was added, and a urethane prepolymer coating solution was prepared with methyl isobutyl ketone as a solvent at a solid content concentration of 10%.
  • Forming material B The same catalyst and solvent as the forming agent A were used except that a 75% ethyl acetate solution of urethane prepolymer composed of diphenylmethane diisocyanate and trimethylolpropane (trade name “Coronate 2067” manufactured by Tosoh Corporation) was used. Thus, a coating solution was prepared.
  • Forming material C The same catalyst and solvent as the forming agent A except that a 75% ethyl acetate solution of urethane prepolymer composed of hexamethylene diisocyanate and trimethylolpropane (trade name “Coronate HL” manufactured by Tosoh Corporation) was used. A coating solution was prepared using this.
  • Forming material D 80 parts of urethane acrylate resin (manufactured by Nippon Gosei Co., Ltd., product name “purple UV-1700”), hydroxyethyl acrylamide (manufactured by Kojin Co., Ltd., product name “HEAA”) and photopolymerization initiator (Ciba Japan)
  • a product name “Irgacure 907”) was added, and a urethane acrylate coating solution was prepared with methyl isobutyl ketone as a solvent to a solid content concentration of 10%.
  • Forming material E Polyvinyl alcohol resin having a polymerization degree of 2500 and a saponification degree of 99.0% (trade name: JC-25, manufactured by Nippon Acetate / Poval) is purely dissolved, and an aqueous solution having a solid content concentration of 4% by weight is obtained. Prepared.
  • Alkaline glass A micro slide glass manufactured by Matsunami Glass Co., Ltd. having a thickness of 1200 to 1500 ⁇ m was used.
  • Gorilla glass The product name “Gorilla Glass 2” manufactured by Corning with a thickness of 700 ⁇ m was used.
  • Alkali-free glass The product name “Eagle XG” manufactured by Corning Inc. having a thickness of 700 ⁇ m was used.
  • cross-linking agent 100 parts by weight of the solid content of the acrylic polymer solution is a cross-linking agent mainly composed of a compound having an isocyanate group of 0.5 part (trade name “Coronate L” manufactured by Nippon Polyurethane Co., Ltd.). And 0.075 parts of ⁇ -glycidoxypropyltrimethoxysilane (manufactured by Shin-Etsu Chemical Co., Ltd., trade name “KMB-403”) as a silane coupling agent in this order, was prepared.
  • the pressure-sensitive adhesive solution was applied to the surface of a release sheet (separator) made of a peeled polyethylene terephthalate film (thickness 38 ⁇ m) so that the thickness after drying was 20 ⁇ m and dried to form a pressure-sensitive adhesive layer. Formed.
  • Example 1 Preparation of a single protective polarizing film with a transparent block layer>
  • the transparent block layer forming material A to the polarizer surface (the polarizer surface on which the protective film is not provided) of the piece protective polarizing film with a bar coater, followed by heat treatment at 60 ° C. for 12 hours.
  • a urethane resin layer having a thickness of 1 ⁇ m was formed.
  • Example 2 In Example 1, except that the type of the glass substrate was changed as shown in Table 1, a glass substrate with a transparent block layer and an optical laminate were produced in the same manner as in Example 1.
  • Example 3 A glass substrate and an optical laminate with a transparent block layer were produced in the same manner as in Example 1 except that the thickness of the transparent block layer was changed as shown in Table 1 in Example 1.
  • Example 4 ⁇ Production of glass substrate with transparent block layer> After applying the transparent block layer forming material A to the glass substrate (alkali glass) with a bar coater, heat treatment was performed at 60 ° C. for 12 hours to form a urethane resin layer having a thickness of 1 ⁇ m.
  • the pressure-sensitive adhesive layer formed on the release treatment surface of the release sheet is bonded to the surface of the polarizer of the piece protective polarizing film (the surface of the polarizer on which the protective film is not provided).
  • a polarizing film with a layer was produced.
  • the transparent block layer (urethane resin layer) side of the substrate with the transparent block layer was bonded to the pressure-sensitive adhesive layer.
  • Example 5 A glass substrate and an optical laminate with a transparent block layer were prepared in the same manner as in Example 4 except that the transparent block layer forming material was changed as shown in Table 1 in Example 4.
  • Example 6 Preparation of a single protective polarizing film with a transparent block layer>
  • the transparent block layer forming material A to the polarizer surface (the polarizer surface on which the protective film is not provided) of the piece protective polarizing film with a bar coater, followed by heat treatment at 60 ° C. for 12 hours.
  • a urethane resin layer having a thickness of 1 ⁇ m was formed.
  • the release sheet was peeled after the adhesive layer formed on the release treatment surface of the release sheet (separator) was bonded to the transparent block layer formed on the single protective polarizing film.
  • TAC triacetyl cellulose
  • the pressure-sensitive adhesive layer formed on the release treatment surface of the release sheet (separator) was further bonded to the TAC film.
  • a polarizing film with an adhesive layer was prepared. Subsequently, after peeling off the release sheet from the pressure-sensitive adhesive layer of the polarizing film with the pressure-sensitive adhesive layer, the glass substrate (alkali glass) was bonded to the pressure-sensitive adhesive layer.
  • Example 1 a piece with a transparent block layer was prepared in the same manner as in Example 1 except that the type of protective film, the forming material of the transparent block layer, the thickness, and the type of glass substrate were changed as shown in Table 1. A protective polarizing film and an optical laminate were produced. In addition, the formation of the transparent block layer of Comparative Example 4 was performed by applying the forming agent D to the polarizer surface (the polarizer surface on which the protective film was not provided) of the piece protective polarizing film with a bar coater. Heated at 0 ° C. for 1 minute.
  • the coating layer was irradiated with ultraviolet rays having an integrated light quantity of 300 mJ / cm 2 with a high-pressure mercury lamp to form a urethane acrylate resin layer having a thickness of 1 ⁇ m.
  • Formation of the transparent block layer of Comparative Example 5 was performed at 60 ° C. after applying the forming agent E by a bar coater on the surface of the polarizer of the one-side protective polarizing film (polarizer surface on which no protective film was provided). This was performed by heating for 3 minutes to form a 1 ⁇ m thick polyvinyl alcohol resin layer. In Comparative Example 1 and Reference Example 1, no transparent block layer was formed.
  • the single transmittance T and polarization degree P of the obtained piece-protecting polarizing film were measured using a spectral transmittance measuring device with an integrating sphere (Dot-3c, Murakami Color Research Laboratory).
  • the degree of polarization P is the transmittance when two identical polarizing films are overlapped so that their transmission axes are parallel (parallel transmittance: Tp), and overlapped so that their transmission axes are orthogonal to each other. It is calculated
  • Polarization degree P (%) ⁇ (Tp ⁇ Tc) / (Tp + Tc) ⁇ 1/2 ⁇ 100
  • Each transmittance is represented by a Y value obtained by correcting visibility with a two-degree field of view (C light source) of JIS Z8701, with 100% of the completely polarized light obtained through the Granteller prism polarizer.

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