WO2019244915A1 - Film polarisant, film polarisant avec couche adhésive et dispositif d'affichage d'image - Google Patents

Film polarisant, film polarisant avec couche adhésive et dispositif d'affichage d'image Download PDF

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Publication number
WO2019244915A1
WO2019244915A1 PCT/JP2019/024221 JP2019024221W WO2019244915A1 WO 2019244915 A1 WO2019244915 A1 WO 2019244915A1 JP 2019024221 W JP2019024221 W JP 2019024221W WO 2019244915 A1 WO2019244915 A1 WO 2019244915A1
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Prior art keywords
film
polarizing film
polarizer
adhesive layer
protective film
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PCT/JP2019/024221
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English (en)
Japanese (ja)
Inventor
史枝 片山
勝則 高田
玲子 品川
哲郎 竹田
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日東電工株式会社
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Publication of WO2019244915A1 publication Critical patent/WO2019244915A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • 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
    • 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 a polarizing film and a polarizing film with an adhesive layer having the polarizing film and an adhesive layer. Further, the present invention relates to an image display device including the polarizing film or the polarizing film with an adhesive layer.
  • a polarizing film is used for image display.
  • a liquid crystal display LCD
  • a circularly polarizing film in which a polarizing film and a quarter-wave plate are laminated is disposed on the viewing side of the organic light emitting layer in order to shield specular reflection of external light on the metal electrode.
  • polarizing film generally, a polyvinyl alcohol-based film and a polarizer made of a dichroic material such as iodine, on one or both sides thereof, a protective film bonded with a polyvinyl alcohol-based adhesive or the like is used. ing.
  • the polarizing film In a severe environment of a thermal shock (for example, a heat shock test in which a temperature condition of ⁇ 40 ° C. and 85 ° C. is repeated), the polarizing film is entirely formed in the absorption axis direction of the polarizer due to a change in shrinkage stress of the polarizer. There is a problem that cracks (through cracks) easily occur.
  • Patent Document 1 discloses a polarizing plate in which a transparent protective film is disposed on both sides of a polarizing film for the purpose of providing a polarizing plate having excellent durability even under a thermal shock environment.
  • the difference between the linear expansion coefficient in the direction perpendicular to the direction of the polarizing film and the linear expansion coefficient in the direction perpendicular to the absorption axis of the polarizing plate of the transparent protective film disposed on at least one surface of the polarizing film is 1.3 ⁇ 10
  • a polarizing plate characterized by being at most ⁇ 4 / ° C. has been proposed.
  • An object of the present invention is to provide a polarizing film in which cracks are less likely to occur in the polarizer even under severe thermal shock environment.
  • Another object of the present invention is to provide a polarizing film with an adhesive layer having the polarizing film and the adhesive layer, and an image display device including the polarizing film or the polarizing film with the adhesive layer.
  • the present invention is a polarizing film provided with a protective film on one or both sides of the polarizer via an adhesive layer, At least one of the protective films provided on the polarizer satisfies the following formula (1).
  • Y 1.26 ⁇ lnX + 3.5
  • Y Coefficient of linear expansion of protective film ( ⁇ 10 ⁇ 5 / K)
  • X Elongation at break of protective film (%)
  • the Y ( ⁇ 10 ⁇ 5 / K) is preferably 4 or less.
  • the thickness of the polarizer is preferably 10 ⁇ m or less.
  • the present invention also relates to a polarizing film with an adhesive layer having the polarizing film and the adhesive layer.
  • the present invention also relates to an image display device in which the polarizing film or the polarizing film with an adhesive layer is disposed in an image display cell.
  • At least one protective film that satisfies the above formula (1) as a protective film provided on one or both surfaces of the polarizer, the stress caused by the expansion and contraction of the polarizer due to the stress based on the expansion and contraction of the protective film. Since it can be alleviated, cracks hardly occur in the polarizer.
  • the stress caused by expansion and contraction of the polarizer can be more effectively reduced, and thus the cracks in the polarizer can be reduced. Can be more effectively suppressed.
  • a protective film having low moisture permeability tends to have a large coefficient of linear expansion, and it is difficult to alleviate the stress caused by expansion and contraction of the polarizer, so that the polarizer is easily cracked.
  • a protective film having a large elongation at break and satisfying the above formula (1) can effectively reduce the stress caused by expansion and contraction of the polarizer. Therefore, cracks hardly occur in the polarizer. Therefore, the polarizing film of the present invention can achieve both suppression of deterioration of the polarizer due to humidification (improvement of humidification reliability) and suppression of occurrence of cracks.
  • the polarizing film of the present invention has a protective film provided on one or both sides of a polarizer via an adhesive layer, and at least one of the protective films provided on the polarizer has the following formula (1): To satisfy. Y ⁇ 1.26 ⁇ lnX + 3.5 (1) Y: Coefficient of linear expansion of protective film ( ⁇ 10 ⁇ 5 / K) X: Elongation at break of protective film (%)
  • Polarizer Known polarizers can be used without particular limitation, but it is preferable to use a polarizer having a thickness of 10 ⁇ m or less from the viewpoint of reducing the thickness and suppressing the occurrence of cracks.
  • the thickness of the polarizer is more preferably 8 ⁇ m or less, further preferably 7 ⁇ m or less, and still more preferably 6 ⁇ m or less.
  • the thickness of the polarizer is preferably 2 ⁇ m or more, and more preferably 3 ⁇ m or more.
  • a polarizer using a polyvinyl alcohol-based resin is used.
  • the polarizer include, for example, a polyvinyl alcohol-based film, a partially formalized polyvinyl alcohol-based film, a hydrophilic polymer film such as an ethylene-vinyl acetate copolymer-based partially saponified film, and dichroic properties of iodine and a dichroic dye.
  • examples thereof include a uniaxially stretched film obtained by adsorbing a substance, and a polyene-based oriented film such as a dehydrated product of polyvinyl alcohol and a dehydrochlorinated product of polyvinyl chloride.
  • a polarizer composed of a polyvinyl alcohol-based film and a dichroic substance such as iodine is preferable.
  • Stretching may be performed after dyeing with iodine, may be performed while dyeing, or may be dyed with iodine after stretching. Stretching can be performed in an aqueous solution of boric acid or potassium iodide or in a water bath.
  • the polarizer preferably contains boric acid from the viewpoint of stretching stability and humidification reliability. Further, the content of boric acid contained in the polarizer is preferably 22% by weight or less, more preferably 20% by weight or less, based on the total amount of the polarizer, from the viewpoint of suppressing the occurrence of cracks. From the viewpoint of stretching stability and humidification reliability, the boric acid content based on the total amount of the polarizer is preferably 10% by weight or more, and more preferably 12% by weight or more.
  • Japanese Patent No. 4751486 and Patent Document 4 disclose that, among manufacturing methods including a step of stretching in a state of a laminate and a step of dyeing, it is possible to stretch at a high magnification and improve polarization performance.
  • Preferred are those obtained by a production method including a step of stretching in a boric acid aqueous solution as described in JP-B-47515481 and JP-B-4815544, and particularly described in JP-B-4775481 and JP-B-4815544.
  • stretching in a boric-acid aqueous solution with a certain thing is preferable.
  • These thin polarizers can be obtained by a manufacturing method including a step of stretching a polyvinyl alcohol-based resin (hereinafter, also referred to as a PVA-based resin) layer and a resin substrate for stretching in a laminate state and a step of dyeing.
  • a manufacturing method including a step of stretching a polyvinyl alcohol-based resin (hereinafter, also referred to as a PVA-based resin) layer and a resin substrate for stretching in a laminate state and a step of dyeing.
  • a manufacturing method including a step of stretching a polyvinyl alcohol-based resin (hereinafter, also referred to as a PVA-based resin) layer and a resin substrate for stretching in a laminate state and a step of dyeing.
  • polyester polymers such as polyethylene terephthalate and polyethylene naphthalate
  • cellulosic polymers such as diacetyl cellulose and triacetyl cellulose
  • acrylic polymers such as polymethyl methacrylate
  • styrene such as polystyrene and acrylonitrile-styrene copolymer (AS resin) Polymers
  • AS resin acrylonitrile-styrene copolymer
  • the content of the polymer in the protective film is preferably 50 to 100% by weight, more preferably 50 to 99% by weight, further preferably 60 to 98% by weight, and still more preferably 70 to 97% by weight. If the content of the polymer in the protective film is less than 50% by weight, the high transparency or the like inherent in the polymer may not be sufficiently exhibited.
  • 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 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 thickness of the protective film can be determined as appropriate, but it is about 1 to 500 ⁇ m from the viewpoint of workability such as strength and handleability, and thinness.
  • the thickness of the protective film is preferably 1 to 300 ⁇ m, more preferably 5 to 200 ⁇ m, still more preferably 5 to 150 ⁇ m, and still more preferably 20 to 100 ⁇ m.
  • a functional layer such as a hard coat layer, an anti-reflection layer, an anti-sticking layer, a diffusion layer or an anti-glare layer can be provided on the surface of the protective film on which the polarizer is not adhered.
  • the functional layers such as the hard coat layer, the antireflection layer, the anti-sticking layer, the diffusion layer and the antiglare layer can be provided on the protective film itself, or separately provided separately from the protective film. it can.
  • At least one of the protective films (which may include the functional layer) provided on the polarizer satisfies the following formula (1).
  • the protective films provided on both surfaces of the polarizer each satisfy the following formula (1).
  • the method for measuring the coefficient of linear expansion and the elongation at break of the protective film is as described in Examples. Y ⁇ 1.26 ⁇ lnX + 3.5 (1) Y: Coefficient of linear expansion of protective film ( ⁇ 10 ⁇ 5 / K) X: Elongation at break of protective film (%)
  • the protective film satisfying the above formula (1) can be produced, for example, by stretching a cycloolefin-based polymer film to a thickness of about 17 to 18 ⁇ m.
  • protective films satisfying the above formula (1) include, for example, TJ25UL (manufactured by Fuji Film, raw material: triacetylcellulose-based polymer, thickness: 25 ⁇ m), ZT12 (manufactured by Zeon Corporation, raw material: cycloolefin-based polymer, thickness) : 17 ⁇ m), KC2UA (manufactured by Konica Minolta, raw material: triacetylcellulose-based polymer, thickness: 20 ⁇ m), and KC2UGR-HC (manufactured by Konica Minolta, triacetylcellulose-based polymer film provided with an acrylic resin-based hard coat layer) , Thickness: 37 ⁇ m).
  • TJ25UL manufactured by Fuji Film, raw material: triacetylcellulose-based polymer, thickness: 25 ⁇ m
  • ZT12 manufactured by Zeon Corporation, raw material: cycloolefin-based polymer, thickness) : 17 ⁇ m
  • KC2UA manufactured by
  • the protective film satisfying the above formula (1) preferably has a linear expansion coefficient Y ( ⁇ 10 ⁇ 5 / K) of 4 or less, more preferably 3.5 or less, and still more preferably 3.1 or less. is there.
  • the adhesive layer is formed by an adhesive.
  • the type of the adhesive is not particularly limited, and various adhesives 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, and active energy ray-curable adhesives. Alternatively, an active energy ray-curable adhesive is suitable.
  • water-based adhesive examples include an isocyanate-based adhesive, a polyvinyl alcohol-based adhesive, a gelatin-based adhesive, a vinyl latex-based adhesive, and an aqueous polyester.
  • the water-based adhesive is usually used as an adhesive composed of an aqueous solution, and usually contains a solid content of 0.5 to 60% by weight.
  • the active energy ray-curable adhesive is an adhesive whose curing progresses with an active energy ray such as an electron beam or an ultraviolet ray (radical-curable or cationically-curable). Can be used.
  • an active energy ray such as an electron beam or an ultraviolet ray (radical-curable or cationically-curable).
  • an active energy ray such as an electron beam or an ultraviolet ray (radical-curable or cationically-curable).
  • an active energy ray-curable adhesive for example, a photo-radical curable adhesive can be used.
  • the adhesive contains a radical polymerizable compound and a photopolymerization initiator.
  • the method of applying the adhesive is appropriately selected depending on the viscosity of the adhesive and the desired thickness.
  • the coating method include, for example, a reverse coater, a gravure coater (direct, reverse or offset), a bar reverse coater, a roll coater, a die coater, a bar coater, a rod coater, and the like.
  • a method such as a dipping method can be appropriately used for coating.
  • the adhesive when using an aqueous adhesive or the like, the adhesive is preferably applied so that the thickness of the finally formed adhesive layer is 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 set to 0.1 to 200 ⁇ m. More preferably, it is 0.5 to 50 ⁇ m, further preferably 0.5 to 10 ⁇ m.
  • an easy-adhesion layer can be provided between the protective film and the adhesive layer.
  • the easy-adhesion layer can be formed of, for example, various resins having a polyester skeleton, polyether skeleton, polycarbonate skeleton, polyurethane skeleton, silicone, polyamide skeleton, polyimide skeleton, polyvinyl alcohol skeleton, and the like. These polymer resins can be used alone or in combination of two or more. Further, other additives may be added to the formation of the easily adhesive layer. Specifically, stabilizers such as tackifiers, ultraviolet absorbers, antioxidants, and heat stabilizers may be used.
  • the easy-adhesion layer is usually provided in advance on the 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 the material for forming the easy-adhesion layer on the protective film by a known technique.
  • the material for forming the easily adhesive layer is usually adjusted as a solution diluted to an appropriate concentration in consideration of the thickness after drying, the smoothness of coating, and the like.
  • 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. In this case, it is preferable that the total thickness of the easy-adhesion layers be in the above range.
  • the polarizing film with the pressure-sensitive adhesive layer of the present invention has the polarizing film and the pressure-sensitive adhesive layer.
  • both protective polarizing films in which protective films are provided on both surfaces of a polarizer, an adhesive layer is provided on one surface of both protective polarizing films directly or via another layer.
  • a surface protection film may be provided directly or via another layer on the other surface of both protective polarizing films.
  • an adhesive layer is provided directly or via another layer on the side of the one-sided protective polarizing film on the polarizer side.
  • a surface protective film may be provided directly or via another layer on the protective film side of the one-side protective polarizing film.
  • the other layers are not particularly limited, and include known functional layers and optical layers provided on the polarizing film.
  • the optical layer include a reflection plate, a semi-transmission plate, a retardation plate (including a wavelength plate such as ⁇ or 4), a viewing angle compensation film, and a brightness enhancement film.
  • the other layer may be provided as one layer, or may be provided as two or more layers.
  • the pressure-sensitive adhesive layer is provided on one side of the polarizing film in order to attach the polarizing film to a cell substrate such as a liquid crystal cell.
  • the thickness of the pressure-sensitive adhesive layer is not particularly limited, and is, for example, about 1 to 100 ⁇ m, preferably 2 to 50 ⁇ m, more preferably 2 to 40 ⁇ m, and further preferably 5 to 35 ⁇ m.
  • a suitable pressure-sensitive adhesive can be used, and the type thereof is not particularly limited.
  • the adhesive a rubber-based adhesive, an acrylic-based adhesive, a silicone-based adhesive, a urethane-based adhesive, a vinylalkyl ether-based adhesive, a polyvinyl alcohol-based adhesive, a polyvinylpyrrolidone-based adhesive, a polyacrylamide-based adhesive, Cellulose-based adhesives and the like can be mentioned.
  • acrylic pressure-sensitive adhesives having such characteristics are preferably used.
  • Examples of the method for forming the pressure-sensitive adhesive layer include, for example, a method in which the pressure-sensitive adhesive is applied to a separator or the like that has been subjected to a release treatment, and a polymerization solvent or the like is dried and removed to form a pressure-sensitive adhesive layer.
  • a method of forming a pressure-sensitive adhesive layer on a polarizing film by applying a pressure-sensitive adhesive and removing a polymerization solvent by drying is exemplified. In applying the pressure-sensitive adhesive, one or more solvents other than the polymerization solvent may be newly added as appropriate.
  • ⁇ ⁇ ⁇ ⁇ ⁇ Silicone release liners are preferably used as the release-treated separator.
  • a method for drying the pressure-sensitive adhesive may be appropriately selected depending on the purpose.
  • a method of heating and drying the coating film is used.
  • the heating and drying temperature is preferably from 40 ° C to 200 ° C, more preferably from 50 ° C to 180 ° C, and particularly preferably from 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 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 include a method such as an extrusion coating method.
  • the pressure-sensitive adhesive layer When the pressure-sensitive adhesive layer is exposed, the pressure-sensitive adhesive layer may be protected by a sheet (separator) that has been subjected to a release treatment until it is practically used.
  • a constituent material of the separator for example, polyethylene, polypropylene, polyethylene terephthalate, a plastic film such as a polyester film, paper, cloth, a porous material such as a nonwoven fabric, a net, a foamed sheet, a metal foil, and a laminate of these as appropriate
  • 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.
  • the plastic film include polyethylene film, polypropylene film, polybutene film, polybutadiene film, polymethylpentene film, polyvinyl chloride film, and vinyl chloride film.
  • examples 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.
  • the separator if necessary, silicone-based, fluorine-based, long-chain alkyl-based or fatty acid amide-based release agent, release and antifouling treatment with silica powder, etc., coating type, kneading type, evaporation type It is also possible to perform an antistatic treatment such as the following. In particular, by appropriately performing a release treatment such as a silicone treatment, a long-chain alkyl treatment, or a fluorine treatment on the surface of the separator, the releasability from the pressure-sensitive adhesive layer can be further improved.
  • the surface protective film usually has a base film and an adhesive layer, and protects the polarizing film via the adhesive layer.
  • a film material having or near isotropy is selected from the viewpoint of testability and manageability.
  • the film material include a polyester resin such as a polyethylene terephthalate film, a cellulose resin, an acetate resin, a polyether sulfone resin, a polycarbonate resin, a polyamide resin, a polyimide resin, a polyolefin resin, and an acrylic resin.
  • a transparent polymer such as a resin can be used. Of these, polyester resins are preferred.
  • the base film can be used as a laminate of one or more film materials, and a stretched product of the film can also be used.
  • the thickness of the substrate film is generally 500 ⁇ m or less, preferably 10 to 200 ⁇ m.
  • Examples of the pressure-sensitive adhesive forming the pressure-sensitive adhesive layer of the surface protective film include a pressure-sensitive adhesive having a base polymer of (meth) acrylic polymer, silicone polymer, polyester, polyurethane, polyamide, polyether, fluorine-based or rubber-based polymer.
  • the agent can be appropriately selected and used. From the viewpoints of transparency, weather resistance, heat resistance, and the like, an acrylic pressure-sensitive adhesive containing 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 pressure-sensitive adhesive strength. Usually, it is about 1 to 100 ⁇ m, preferably 5 to 50 ⁇ m.
  • a release treatment layer can be provided on the surface opposite to the surface on which the pressure-sensitive adhesive layer of the base film is provided, using a low-adhesion material such as silicone treatment, long-chain alkyl treatment, or fluorine treatment. .
  • the image display device of the present invention may be any one including the polarizing film or the polarizing film with an adhesive layer of the present invention, and other configurations may be the same as those of the conventional image display device. it can.
  • the polarizing film or the polarizing film with a pressure-sensitive adhesive layer is applied to an image display cell.
  • the image display device is a liquid crystal display device
  • the polarizing film or the polarizing film with an adhesive layer can be applied to both the viewing side and the backlight side of an image display cell (liquid crystal cell).
  • the image display device is an organic EL display device
  • the polarizing film or the polarizing film with an adhesive layer can be applied to the viewing side of the image display cell.
  • the image display device of the present invention has high reliability because it includes the polarizing film or the polarizing film with the pressure-sensitive adhesive layer.
  • a corona treatment is applied to one surface of an 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.
  • Alcohol degree of polymerization: 4200, degree of saponification: 99.2 mol%
  • acetoacetyl-modified PVA degree of polymerization: 1200, degree of acetoacetyl modification: 4.6%, degree of saponification: 99.0 mol% or more, Japan An aqueous solution containing Synthetic Chemical Industry Co., Ltd.
  • the laminate was immersed in a washing bath at a liquid temperature of 30 ° C. (an aqueous solution obtained by mixing 4 parts by weight of potassium iodide with 100 parts by weight of water) (washing treatment).
  • a washing bath at a liquid temperature of 30 ° C.
  • washing treatment washing treatment
  • an optical film laminate including a 5 ⁇ m-thick polarizer was obtained.
  • the obtained polarizer had a boric acid content of 20% by weight.
  • Example 1 (Production of one-sided protective polarizing film)
  • the protective film 1 (HC) was coated on the surface of the polarizer (thickness: 5 ⁇ m) of the optical film laminate so that the thickness of the cured adhesive layer was 0.1 ⁇ m.
  • 25 ⁇ m TAC film: TJ25UL manufactured by Fuji Film, raw material: triacetylcellulose-based polymer, thickness: 25 ⁇ m
  • a film provided with an acrylic resin-based hard coat layer and then irradiated with ultraviolet rays as active energy rays.
  • the adhesive was cured. Thereafter, the amorphous PET substrate provided on one side of the polarizer was peeled off to produce a one-sided protective polarizing film.
  • Example 2 A one-sided protective polarizing film was produced in the same manner as in Example 1 except that the protective film 1 shown in Table 1 was used.
  • Example 4 production of both protective polarizing films
  • the protective film 1 (HC) was coated on the surface of the polarizer (thickness: 5 ⁇ m) of the optical film laminate so that the thickness of the cured adhesive layer was 0.1 ⁇ m.
  • 25 ⁇ m TAC film: TJ25UL manufactured by Fuji Film, raw material: triacetylcellulose-based polymer, thickness: 25 ⁇ m
  • a film provided with an acrylic resin-based hard coat layer and then irradiated with ultraviolet rays as active energy rays.
  • the adhesive was cured.
  • the amorphous PET substrate provided on one surface of the polarizer is peeled off, and the ultraviolet curable adhesive is cured on the peeled surface so that the thickness of the adhesive layer becomes 0.1 ⁇ m.
  • a protective film 2 25 ⁇ m TAC film: TJ25UL (manufactured by Fuji Film, raw material: triacetylcellulose-based polymer, thickness: 25 ⁇ m)
  • the adhesive is cured by irradiating ultraviolet rays as active energy rays. In this way, both protective polarizing films were produced.
  • TAC film with HC TJ25UL (manufactured by Fuji Film, raw material: triacetylcellulose-based polymer, thickness: 25 ⁇ m) with a film provided with an acrylic resin-based hard coat layer
  • TAC film 25 ⁇ m
  • TJ25UL Fluji Film, raw material: triacetyl cellulose polymer, thickness: 25 ⁇ m
  • 17 ⁇ m COP film ZT12 (manufactured by Zeon Corporation, a biaxially stretched cycloolefin-based polymer film having a front phase difference of 116 nm and a thickness difference of 81 nm, a thickness of 17 ⁇ m)
  • TAC film 20 ⁇ m TAC film: KC2UA (manufactured by Konica Minolta, raw material: triacetyl cellulose polymer, thickness: 20 ⁇ m)
  • t-butyl peroxyisopropyl carbonate (Kayacarbon BIC-7, manufactured by Kayaku Akzo Co., Ltd.) was added as a polymerization initiator, and at the same time, 10.0 g of t-butyl peroxyisopropyl carbonate and 230 g were added.
  • MIBK MIBK was added dropwise over 4 hours while refluxing for about 1 hour. Perform solution polymerization at 5 ⁇ 120 ° C., the mixture was aged over an additional 4 hours.
  • a stearyl phosphate / distearyl phosphate mixture (Phoslex A-18, manufactured by Sakai Chemical Industry Co., Ltd.) was added, and the mixture was refluxed at about 90 to 120 ° C. for 5 hours under reflux. A condensation reaction was performed.
  • the obtained polymer solution is subjected to a vent-type screw twin-screw extruder having a barrel temperature of 260 ° C., a rotation speed of 100 rpm, a degree of vacuum of 13.3 to 400 hPa (10 to 300 mmHg), one rear vent and four forevents.
  • the lactone ring-containing polymer had a weight average molecular weight of 133,000, a melt flow rate of 6.5 g / 10 min, and a glass transition temperature of 131 ° C.
  • the obtained pellets and acrylonitrile-styrene (AS) resin (Toyo AS AS20, manufactured by Toyo Styrene Co., Ltd.) are kneaded and extruded at a mass ratio of 90/10 using a single screw extruder (screw 30 mm ⁇ ). As a result, transparent pellets were obtained.
  • the glass transition temperature of the obtained pellet was 127 ° C.
  • the pellets were melt-extruded from a coat hanger type T die having a width of 400 mm using a 50 mm ⁇ single screw extruder to produce a film having a thickness of 80 ⁇ m.
  • the resin was melt-extruded while supplying 0.66 parts by weight of an ultraviolet absorber (product name: LA-F70, manufactured by ADEKA) with respect to 100 parts by weight of the resin in the pellets.
  • the produced film was stretched 2.0 times at a temperature of 150 ° C. using a biaxial stretching apparatus to obtain a stretched film (20 ⁇ m acrylic film) having a thickness of 20 ⁇ m.
  • the total light transmittance was 93%
  • the in-plane retardation ⁇ nd was 0.8 nm
  • the thickness direction retardation Rth was 1.5 nm.
  • the polymerization conversion ratio (polymerization production amount / monomer preparation amount) of the obtained innermost layer crosslinked methacrylic polymer latex was 98%.
  • the obtained innermost layer polymer latex was kept at 80 ° C. in a nitrogen stream, and 0.1 part of potassium persulfate was added. Then, a simple mixture comprising 41 parts of n-butyl acrylate, 9 parts of styrene, and 1 part of allyl methacrylate was obtained. The monomer mixture was added continuously over 5 hours. During this time, 0.1 part of potassium oleate was added in three portions.
  • the polymerization conversion of the obtained rubber particles was 99%, and the particle size was 225 nm.
  • the obtained rubber particle latex was kept at 80 ° C., and after adding 0.02 parts of potassium persulfate, a monomer mixture of 14 parts of methyl methacrylate and 1 part of n-butyl acrylate was continuously added over 1 hour. After completion of the addition of the monomer mixture, the mixture was kept for 1 hour to obtain a graft copolymer latex. The polymerization conversion was 99%.
  • the obtained graft copolymer latex was kept at 80 ° C., and a monomer mixture of 5 parts of methyl methacrylate and 5 parts of n-butyl acrylate was continuously added over 0.5 hours. After the completion of the addition of the monomer mixture, the mixture was kept for 1 hour to obtain a rubber-containing graft copolymer latex. The polymerization conversion was 99%.
  • the obtained rubber-containing graft copolymer latex was subjected to salting out and coagulation with calcium chloride, heat treatment, and drying to obtain a white powdery crosslinked elastic body.
  • the imidization was carried out using a co-rotating twin-screw extruder having a diameter of 15 mm.
  • the set temperature of each temperature control zone of the extruder was 230 ° C.
  • the screw rotation speed was 150 rpm
  • the MS resin was supplied at 2.0 kg / hr
  • the supply amount of monomethylamine was 2 parts by weight based on 100 parts by weight of the MS resin. .
  • KC2UGR-HC manufactured by Konica Minolta, a film in which an acrylic resin hard coat layer is provided on a triacetyl cellulose polymer film, thickness: 37 ⁇ m
  • a stearyl phosphate / distearyl phosphate mixture (Phoslex A-18, manufactured by Sakai Chemical Industry Co., Ltd.) was added, and the mixture was refluxed at about 90 to 120 ° C. for 5 hours under reflux. A condensation reaction was performed.
  • the obtained polymer solution is subjected to a vent-type screw twin-screw extruder having a barrel temperature of 260 ° C., a rotation speed of 100 rpm, a degree of vacuum of 13.3 to 400 hPa (10 to 300 mmHg), one rear vent and four forevents.
  • the lactone ring-containing polymer had a weight average molecular weight of 133,000, a melt flow rate of 6.5 g / 10 min, and a glass transition temperature of 131 ° C.
  • the obtained pellets and acrylonitrile-styrene (AS) resin (Toyo AS AS20, manufactured by Toyo Styrene Co., Ltd.) are kneaded and extruded at a mass ratio of 90/10 using a single screw extruder (screw 30 mm ⁇ ). As a result, transparent pellets were obtained.
  • the glass transition temperature of the obtained pellet was 127 ° C.
  • the pellet was melt-extruded from a coat hanger type T die having a width of 400 mm using a 50 mm ⁇ single screw extruder to produce a film having a thickness of 160 ⁇ m.
  • the produced film was stretched 2.0 times using a biaxial stretching device at a temperature of 150 ° C.
  • a stretched film having a thickness of 40 ⁇ m When the optical properties of this stretched film were measured, the total light transmittance was 93%, the in-plane retardation ⁇ nd was 0.8 nm, and the thickness direction retardation Rth was 1.5 nm.
  • a resin contained in the coating liquid a UV-curable resin (manufactured by Shin-Nakamura Chemical Co., Ltd., trade name: “NK oligomer UA-53H-80BK”, solid content concentration: 80%), 70 parts by weight of solid content, UV curable resin 30 parts by weight of a resin (manufactured by Shin-Nakamura Chemical Co., Ltd., trade name “A-GLY-9E”, solid content concentration 100%) was prepared.
  • the prepared hard coat layer forming material was applied on a 30 ⁇ m acrylic film containing the crosslinked elastic material so that the thickness of the hard coat layer after curing became 10 ⁇ m to form a coating film. Thereafter, the coating film is dried at 90 ° C. for 1 minute, and further irradiated with ultraviolet light having an integrated light amount of 200 mJ / cm 2 by a high-pressure mercury lamp, and the coating film is cured to form a hard coat layer, and to form a hard coat layer.
  • a 30 ⁇ m acrylic film containing a crosslinked elastic body was produced.
  • t-butyl peroxyisopropyl carbonate (Kayacarbon BIC-7, manufactured by Kayaku Akzo Co., Ltd.) was added as a polymerization initiator, and at the same time, 10.0 g of t-butyl peroxyisopropyl carbonate and 230 g were added.
  • MIBK MIBK was added dropwise over 4 hours while refluxing for about 1 hour. Perform solution polymerization at 5 ⁇ 120 ° C., the mixture was aged over an additional 4 hours.
  • a stearyl phosphate / distearyl phosphate mixture (Phoslex A-18, manufactured by Sakai Chemical Industry Co., Ltd.) was added, and the mixture was refluxed at about 90 to 120 ° C. for 5 hours under reflux. A condensation reaction was performed.
  • the obtained polymer solution is subjected to a vent-type screw twin-screw extruder having a barrel temperature of 260 ° C., a rotation speed of 100 rpm, a degree of vacuum of 13.3 to 400 hPa (10 to 300 mmHg), one rear vent and four forevents.
  • the lactone ring-containing polymer had a weight average molecular weight of 133,000, a melt flow rate of 6.5 g / 10 min, and a glass transition temperature of 131 ° C.
  • the obtained pellets and acrylonitrile-styrene (AS) resin (Toyo AS AS20, manufactured by Toyo Styrene Co., Ltd.) are kneaded and extruded at a mass ratio of 90/10 using a single screw extruder (screw 30 mm ⁇ ). As a result, transparent pellets were obtained.
  • the glass transition temperature of the obtained pellet was 127 ° C.
  • the pellet was melt-extruded from a coat hanger type T die having a width of 400 mm using a 50 mm ⁇ single screw extruder to produce a film having a thickness of 160 ⁇ m. The produced film was stretched 2.0 times at a temperature of 150 ° C.
  • a stretched film 40 ⁇ m acrylic film having a thickness of 40 ⁇ m.
  • the total light transmittance was 93%
  • the in-plane retardation ⁇ nd was 0.8 nm
  • the thickness direction retardation Rth was 1.5 nm.
  • APF Brightness improving film (Sumitomo 3M, product name: APF, thickness 26 ⁇ m)
  • AP APF with HC A film in which an acrylic resin-based hard coat layer is provided on a brightness enhancement film (Sumitomo 3M, trade name: APF, thickness: 20 ⁇ m)
  • the polarizing films of Examples 1 to 10 in which at least one of the protective films provided on the polarizer satisfies the above formula (1) have a thermal shock (heat shock test in which the temperature conditions of -40 ° C and 85 ° C are repeated) It can be seen that cracks hardly occur in the polarizer even under the severe environment, and that the polarizer is excellent in crack resistance. On the other hand, it can be seen that the polarizing films of Comparative Examples 1 to 9 in which the protective film provided on the polarizer does not satisfy the above formula (1) are liable to cracks in the polarizer due to thermal shock and have poor crack resistance.
  • the polarizing film of the present invention is used alone or as an optical film obtained by laminating the polarizing film on an image display device such as a liquid crystal display (LCD) and an organic EL display.
  • an image display device such as a liquid crystal display (LCD) and an organic EL display.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Polarising Elements (AREA)
  • Liquid Crystal (AREA)

Abstract

La présente invention a pour but de fournir un film polarisant qui n'est pas sensible à l'apparition d'une fissure dans un polariseur même dans des conditions de choc thermique rigoureuses. Un film polarisant selon la présente invention est obtenu en dotant une surface ou les deux surfaces d'un polariseur d'un film protecteur, une couche adhésive étant interposée entre eux ; et au moins un film protecteur disposé sur le polariseur satisfait à la formule (1). (1) : Y ≤ 1,26 × lnX + 3,5 (dans la formule, Y est le coefficient de dilatation linéaire (× 10-5/K) du film protecteur ; et X représente l'allongement (%) à la rupture du film protecteur.)
PCT/JP2019/024221 2018-06-20 2019-06-19 Film polarisant, film polarisant avec couche adhésive et dispositif d'affichage d'image WO2019244915A1 (fr)

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JP2018117047A JP2019219525A (ja) 2018-06-20 2018-06-20 偏光フィルム、粘着剤層付き偏光フィルム、及び画像表示装置

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TWI801931B (zh) * 2021-07-13 2023-05-11 住華科技股份有限公司 光學膜以及所形成之顯示裝置

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