WO2012105668A1 - Procédé pour la production de film stratifié polarisant et film stratifié polarisant double face - Google Patents

Procédé pour la production de film stratifié polarisant et film stratifié polarisant double face Download PDF

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Publication number
WO2012105668A1
WO2012105668A1 PCT/JP2012/052439 JP2012052439W WO2012105668A1 WO 2012105668 A1 WO2012105668 A1 WO 2012105668A1 JP 2012052439 W JP2012052439 W JP 2012052439W WO 2012105668 A1 WO2012105668 A1 WO 2012105668A1
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Prior art keywords
film
sided
double
polyvinyl alcohol
polarizing
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PCT/JP2012/052439
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English (en)
Japanese (ja)
Inventor
雄一朗 九内
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Sumitomo Chemical Co Ltd
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Sumitomo Chemical Co Ltd
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Priority to KR1020137022606A priority Critical patent/KR101420584B1/ko
Priority to KR1020147013615A priority patent/KR20140085529A/ko
Publication of WO2012105668A1 publication Critical patent/WO2012105668A1/fr
Anticipated expiration legal-status Critical
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/0073—Optical laminates
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/00634—Production of filters
    • B29D11/00644—Production of filters polarizing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
    • G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
    • G02B5/305—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks including organic materials, e.g. polymeric layers
    • 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

Definitions

  • the present invention relates to a polarizing laminate film, a method for producing a polarizing plate or a polarizing plate with a substrate film, and a double-sided laminated film, a double-sided polarizing laminated film, a double-sided laminated film, and a single-sided laminated film.
  • the polarizing plate is widely used as a polarization supplying element in a display device such as a liquid crystal display device.
  • a polarizing film made of a polyvinyl alcohol resin and a protective film made of triacetyl cellulose are conventionally used.
  • notebook personal computers for liquid crystal display devices have been used. With the development of mobile devices such as mobile phones and mobile phones, there is a need to reduce the thickness and weight.
  • a polarizing film is produced by performing a dyeing treatment or a crosslinking treatment, and laminating this on a protective film or the like to form a polarizing plate. Although it was manufactured, it was possible to reduce the thickness only to the limit thickness of the polarizing film alone.
  • the polyvinyl alcohol-type resin layer of a polarizer layer is extended
  • the resin layer is a polarizer layer, the total thickness of the base film and the polarizer layer can be reduced to the limit, and the thickness as the polarizer layer (polarizing film) can be made thinner than before. Methods are known (see, for example, JP2000-338329-A).
  • the present invention is a thin film and a polarizing film having a high polarizing performance.
  • the stretching process, the drying process after dyeing, or the storage of the stretched film is generated.
  • the purpose is to suppress curling.
  • the present invention includes the following.
  • a method for producing a double-sided polarizing laminate film comprising a base film and a polarizer layer formed on both sides of the base film, A resin layer forming step of obtaining a double-sided laminated film by forming a polyvinyl alcohol-based resin layer on both sides of the base film; A stretching step of stretching the double-sided laminated film; A dyeing step of forming a polarizer layer by dyeing the polyvinyl alcohol-based resin layer on both sides of the double-sided laminated film after stretching with a dichroic dye and performing a crosslinking treatment in this order is included.
  • a method for producing a polarizing plate comprising a polarizer layer and a protective film formed on one surface of the polarizer layer, A protective film laminating step for laminating a protective film on both sides of the double-sided polarizing laminate film obtained by the method according to [1], and obtaining a double-sided laminating film;
  • the peeling process which peels at least 1 piece of said polarizing plate from the said double-sided bonding film is included in this order.
  • a polarizing plate with a substrate film comprising: a polarizer layer, a protective film formed on one surface of the polarizer layer, and a substrate film bonded to one surface of the polarizer layer.
  • a manufacturing method comprising: A protective film laminating step for laminating a protective film on both sides of the double-sided polarizing laminate film obtained by the method according to [1], and obtaining a double-sided laminating film; The peeling process which peels off the said polarizing plate with a base film from the said double-sided bonding film is included in this order.
  • a method for producing a polarizing plate comprising a polarizer layer and a protective film formed on one surface of the polarizer layer, A protective film laminating step of laminating a protective film on one surface of the double-sided polarizing laminate film obtained by the method according to [1], and obtaining a single-sided laminating film;
  • the peeling process which peels the said polarizing plate from the said single-sided bonding film is included in this order.
  • a method for producing a single-sided polarizing laminate film comprising a base film and a polarizer layer formed on one surface of the base film, A protective film laminating step of laminating a protective film on one surface of the double-sided polarizing laminate film obtained by the method according to [1], and obtaining a single-sided laminating film;
  • the peeling process which peels the said single-sided polarizing laminated film from the said single-sided bonding film is included in this order.
  • a double-sided laminated film comprising a base film and a polyvinyl alcohol resin layer formed on both sides of the base film.
  • a double-sided laminated film comprising a base film and a polyvinyl alcohol resin layer formed and oriented on both sides of the base film.
  • a double-sided polarizing laminate film comprising a base film and a polyvinyl alcohol resin layer formed on both sides of the base film, oriented and adsorbed with a dichroic dye.
  • a double-sided polarizing laminate film comprising a polarizer layer formed on both sides of the base film, and a protective film bonded to one side of the double-sided polarizing laminate film A single-sided laminated film.
  • a polyvinyl alcohol resin layer having a double area can be treated at once, and the production efficiency of the polarizing plate is improved. Furthermore, it is not necessary to use a special drying furnace at the time of drying in each manufacturing process, and the cost in terms of equipment can be reduced.
  • FIG. 10 is a flowchart for explaining a manufacturing method of the polarizing plate of Example 3.
  • the laminated body provided with the polyvinyl alcohol-type resin layer (layer which consists of polyvinyl alcohol-type resin) on one side of a base film is called a "single area layer film", and it is on both sides of a base film.
  • the laminated body provided with the polyvinyl alcohol-based resin layer is referred to as “double-sided laminated film”.
  • polarizer layer a polyvinyl alcohol-based resin layer having a function as a polarizer
  • a laminate including a polarizer layer on one surface of a base film is referred to as a “single-sided polarizing laminate film”.
  • a laminate having a polarizer layer on both sides of the base film is referred to as a “double-sided polarizing laminate film”.
  • the laminated body provided with the protective film on one surface of the polarizer layer is referred to as “polarizing plate”.
  • thermoplastic resins excellent in transparency, mechanical strength, thermal stability, stretchability, etc. are used, and an appropriate resin can be selected according to their Tg or Tm.
  • thermoplastic resins include polyolefin resins, polyester resins, cyclic polyolefin resins (norbornene resins), (meth) acrylic resins, cellulose ester resins, polycarbonate resins, polyvinyl alcohol resins, vinyl acetate.
  • the base film may be a film made of only one kind of the above-mentioned resin, or may be a film made by blending two or more kinds of resins.
  • the base film may be a single layer film or a multilayer film.
  • polystyrene-based resin examples include polyethylene and polypropylene, which are preferable because they can be stably stretched at a high magnification. Further, an ethylene-polypropylene copolymer obtained by copolymerizing propylene with ethylene can also be used. Copolymerization can be performed with other types of monomers, and examples of other types of monomers copolymerizable with propylene include ethylene and ⁇ -olefins. As the ⁇ -olefin, an ⁇ -olefin having 4 or more carbon atoms is preferably used, and more preferably an ⁇ -olefin having 4 to 10 carbon atoms.
  • ⁇ -olefin having 4 to 10 carbon atoms include linear monoolefins such as 1-butene, 1-pentene, 1-hexene, 1-heptene, 1-octene and 1-decene; Branched monoolefins such as 3-methyl-1-butene, 3-methyl-1-pentene, 4-methyl-1-pentene; vinylcyclohexane and the like.
  • the copolymer of propylene and other monomers copolymerizable therewith may be a random copolymer or a block copolymer.
  • the content of the structural unit derived from the other monomer in the copolymer is determined by infrared (IR) spectrum according to the method described on page 616 of “Polymer Analysis Handbook” (1995, published by Kinokuniya). It can be obtained by measuring.
  • IR infrared
  • propylene-based resins constituting the propylene-based resin film include propylene homopolymer, propylene-ethylene random copolymer, propylene-1-butene random copolymer, and propylene-ethylene-1-butene. Random copolymers are preferably used.
  • the stereoregularity of the propylene resin constituting the propylene resin film is preferably substantially isotactic or syndiotactic.
  • a propylene-based resin film made of a propylene-based resin having substantially isotactic or syndiotactic stereoregularity has relatively good handleability and excellent mechanical strength in a high-temperature environment.
  • the polyester resin is a polymer having an ester bond, and is mainly a polycondensate of a polyvalent carboxylic acid and a polyhydric alcohol.
  • divalent dicarboxylic acid is mainly used, and examples thereof include isophthalic acid, terephthalic acid, dimethyl terephthalate, and dimethyl naphthalenedicarboxylate.
  • divalent diol is mainly used as the polyhydric alcohol used, and examples thereof include propanediol, butanediol, neopentyl glycol, and cyclohexanedimethanol.
  • the resin examples include polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polytrimethylene terephthalate, polytrimethylene naphthalate, polycyclohexane dimethyl terephthalate, polycyclohexane dimethyl naphthalate, and the like. These blend resins and copolymers can also be suitably used.
  • the cyclic polyolefin resin a norbornene resin is preferably used.
  • the cyclic polyolefin-based resin is a general term for resins that are polymerized using a cyclic olefin as a polymerization unit, and examples thereof include resins described in JPH01-240517-A, JPH03-14882-A, JPH03-122137-A, and the like. .
  • ring-opening (co) polymers of cyclic olefins include ring-opening (co) polymers of cyclic olefins, addition polymers of cyclic olefins, cyclic olefins and ⁇ -olefins such as ethylene and propylene (typically random copolymers), And graft polymers obtained by modifying them with an unsaturated carboxylic acid or a derivative thereof, and hydrides thereof.
  • cyclic olefin include norbornene monomers.
  • Topas registered trademark
  • Arton registered trademark
  • ZEONOR registered trademark
  • ZEONEX ZEONEX
  • Apel registered trademark
  • any appropriate (meth) acrylic resin can be adopted as the (meth) acrylic resin.
  • poly (meth) acrylic acid ester such as polymethyl methacrylate, methyl methacrylate- (meth) acrylic acid copolymer, methyl methacrylate- (meth) acrylic acid ester copolymer, methyl methacrylate-acrylic acid ester -(Meth) acrylic acid copolymer, (meth) acrylic acid methyl-styrene copolymer (MS resin, etc.), polymer having an alicyclic hydrocarbon group (for example, methyl methacrylate-cyclohexyl methacrylate copolymer) And methyl methacrylate- (meth) acrylate norbornyl copolymer).
  • poly (meth) acrylic acid ester such as polymethyl methacrylate, methyl methacrylate- (meth) acrylic acid copolymer, methyl methacrylate- (meth) acrylic acid ester copolymer, methyl methacrylate-
  • C1-6 alkyl poly (meth) acrylates such as poly (meth) acrylate methyl
  • the (meth) acrylic resin is a methyl methacrylate resin containing methyl methacrylate as a main component (50 to 100% by weight, preferably 70 to 100% by weight).
  • the cellulose ester resin is an ester of cellulose and a fatty acid.
  • Specific examples of the cellulose ester resin include cellulose triacetate, cellulose diacetate, cellulose tripropionate, and cellulose dipropionate.
  • these copolymers and those obtained by modifying a part of the hydroxyl group with other types of substituents are also included.
  • cellulose triacetate is particularly preferable.
  • Many products of cellulose triacetate are commercially available, which is advantageous in terms of availability and cost.
  • Examples of commercially available cellulose triacetate include Fujitac (registered trademark) TD80 (manufactured by Fuji Film Co., Ltd.), Fujitac (registered trademark) TD80UF (manufactured by Fuji Film Co., Ltd.), Fujitac (registered trademark) TD80UZ (Fuji Film ( Co., Ltd.), Fujitac (registered trademark) TD40UZ (Fuji Film Co., Ltd.), KC8UX2M (Konica Minolta Opto Co., Ltd.), KC4UY (Konica Minolta Opto Co., Ltd.), and the like.
  • Polycarbonate resin is an engineering plastic made of a polymer in which monomer units are bonded via a carbonate group, and is a resin having high impact resistance, heat resistance, and flame retardancy. Moreover, since it has high transparency, it is suitably used in optical applications. In optical applications, resins called modified polycarbonates in which the polymer skeleton is modified in order to lower the photoelastic coefficient, copolymerized polycarbonates with improved wavelength dependency, and the like are also commercially available and can be suitably used. Such polycarbonate resins are widely commercially available.
  • Panlite registered trademark
  • Iupilon registered trademark
  • SD Polyca registered trademark
  • Caliber registered trademark
  • any appropriate additive may be added to the base film in addition to the above thermoplastic resin.
  • additives include ultraviolet absorbers, antioxidants, lubricants, plasticizers, mold release agents, anti-coloring agents, flame retardants, nucleating agents, antistatic agents, pigments, and coloring agents.
  • the content of the thermoplastic resin exemplified above in the base 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. This is because, if the content of the thermoplastic resin in the base film is less than 50% by weight, the high transparency inherent in the thermoplastic resin may not be sufficiently exhibited.
  • the thickness of the base film before stretching can be determined as appropriate, but generally it is preferably 1 to 500 ⁇ m, more preferably 1 to 300 ⁇ m, and even more preferably 5 to 5 from the viewpoint of workability such as strength and handleability. It is 200 ⁇ m, most preferably 5 to 150 ⁇ m.
  • the base film may be subjected to corona treatment, plasma treatment, flame treatment or the like on at least the surface on which the polyvinyl alcohol resin layer is formed in order to improve the adhesion with the polyvinyl alcohol resin layer.
  • the primer layer is a material that exhibits a certain degree of strong adhesion to both the base film and the polyvinyl alcohol resin layer.
  • a thermoplastic resin excellent in transparency, thermal stability, stretchability, etc. is used.
  • Specific examples include acrylic resins and polyvinyl alcohol resins, but are not limited thereto.
  • a polyvinyl alcohol resin having good adhesion is preferably used.
  • polyvinyl alcohol resin used as the primer layer examples include polyvinyl alcohol resin and derivatives thereof.
  • Derivatives of polyvinyl alcohol resin include polyvinyl formal, polyvinyl acetal, etc., olefins such as ethylene and propylene, unsaturated carboxylic acids such as acrylic acid, methacrylic acid and crotonic acid, and alkyl esters of unsaturated carboxylic acids. And those modified with acrylamide or the like.
  • a crosslinking agent may be added to the thermoplastic resin.
  • the cross-linking agent to be added to the thermoplastic resin known ones such as organic and inorganic can be used. What is necessary is just to select a more suitable thing suitably with respect to the thermoplastic resin to be used.
  • low molecular crosslinkers such as epoxy crosslinkers, isocyanate crosslinkers, dialdehyde crosslinkers, metal chelate crosslinkers, high molecular weight polymers such as methylolated melamine resins and polyamide epoxy resins.
  • a crosslinking agent or the like can also be used.
  • thermoplastic resin When a polyvinyl alcohol resin is used as the thermoplastic resin, it is particularly preferable to use a polyamide epoxy resin, a methylolated melamine, a dialdehyde, a metal chelate crosslinking agent, or the like as the crosslinking agent.
  • the thickness of the primer layer is preferably 0.05 to 1 ⁇ m, more preferably 0.1 to 0.4 ⁇ m. If it is too thin, the adhesion between the base film and the polyvinyl alcohol layer will be reduced, and if it is too thick, the polarizing plate will be thick.
  • the polarizer layer is obtained by adsorbing and orienting a dichroic dye on a stretched polyvinyl alcohol-based resin layer.
  • a saponified polyvinyl acetate resin can be used as the polyvinyl alcohol resin constituting the polyvinyl alcohol resin layer.
  • the polyvinyl acetate resin include polyvinyl acetate, which is a homopolymer of vinyl acetate, and copolymers with other monomers copolymerizable with vinyl acetate.
  • examples of other monomers copolymerizable with vinyl acetate include unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, and acrylamides having an ammonium group.
  • the polyvinyl alcohol resin constituting the polarizer layer is preferably a completely saponified product.
  • the range of the degree of saponification is preferably 80 mol% to 100 mol%, more preferably 90 mol% to 99.5 mol%, and further preferably 94 mol% to 99 mol%. Is most preferred. If the degree of saponification is less than 80 mol%, there is a problem inferior in water resistance and moist heat resistance after forming a polarizing plate.
  • the polyvinyl alcohol resin used in the present invention may be a modified polyvinyl alcohol partially modified.
  • polyvinyl alcohol resins modified with olefins such as ethylene and propylene, unsaturated carboxylic acids such as acrylic acid, methacrylic acid, and crotonic acid, alkyl esters of unsaturated carboxylic acids, acrylamide, and the like can be used.
  • the proportion of modification is preferably less than 30 mol%, and more preferably less than 10%. When modification exceeding 30 mol% is performed, it is difficult to adsorb the dichroic dye, and the polarization performance may be lowered.
  • the average polymerization degree of the polyvinyl alcohol-based resin is not particularly limited, but is preferably 100 to 10,000, more preferably 1500 to 8000, and most preferably 2000 to 5000.
  • the average degree of polymerization here is also a numerical value obtained by a method defined by JIS K 6726 (1994).
  • polyvinyl alcohol resin having such characteristics examples include PVA124 (degree of saponification: 98.0 to 99.0 mol%) and PVA117 (degree of saponification: 98.0 to 99.0) manufactured by Kuraray Co., Ltd. Mol%), PVA624 (degree of saponification: 95.0 to 96.0 mol%) and PVA617 (degree of saponification: 94.5 to 95.5 mol%); for example, AH- manufactured by Nippon Synthetic Chemical Industry Co., Ltd. 26 (saponification degree: 97.0 to 98.8 mol%), AH-22 (degree of saponification: 97.5 to 98.5 mol%), NH-18 (degree of saponification: 98.0 to 99.99%).
  • JM-33 degree of saponification: 93.5-95.5 mol%)
  • JM-26 degree of saponification 95.5 to 97.5 mol%)
  • JP-45 degree of saponification: 86.5 to 89.5 mol%)
  • JF-17 degree of saponification: 98.0 to 99.0 mol%)
  • JF -17L degree of saponification: 98.0 to 99.0 mol%)
  • JF-20 degree of saponification: 98.0 to 99.0 mol%) and the like, which are preferably used in the present invention.
  • a polyvinyl alcohol resin layer is formed by forming such a polyvinyl alcohol resin.
  • the method for forming the polyvinyl alcohol-based resin is not particularly limited, and can be formed by a known method, but from the viewpoint of easily obtaining a polarizer layer having a desired thickness, the polyvinyl alcohol-based resin is formed. It is preferable to form a film by applying the above solution on a substrate film.
  • Such a polyvinyl alcohol-based resin layer is stretched and oriented together with the base film, and further, a dichroic dye is adsorbed and oriented to form a polarizer layer.
  • the draw ratio is preferably more than 5 times, more preferably more than 5 times and not more than 17 times.
  • the thickness of the polarizer layer (the thickness of the stretched polyvinyl alcohol resin layer) is preferably 10 ⁇ m or less, more preferably 7 ⁇ m or less. By setting the thickness of the polarizer layer to 10 ⁇ m or less, a thin polarizing plate can be configured.
  • dichroic dye used in the polarizer layer examples include iodine and organic dyes.
  • organic dyes include Red BR, Red LR, Red R, Pink LB, Rubin BL, Bordeaux GS, Sky Blue LG, Lemon Yellow, Blue BR, Blue 2R, Navy RY, Green LG, Violet LB, Violet B, Black H, Black B, Black GSP, Yellow 3G, Yellow R, Orange LR, Orange 3R, Scarlet GL, Scarlet KGL, Congo Red, Brilliant Violet BK, Spura Blue G, Spura Blue GL, Spura Orange GL, Direct Sky Blue, Direct First Orange S, First Black, etc. can be used.
  • One kind of these dichroic substances may be used, or two or more kinds may be used in combination.
  • the protective film may be a simple protective film having no optical function, or may be a protective film having both optical functions such as a retardation film and a brightness enhancement film.
  • the material of the protective film is not particularly limited, but for example, a cyclic polyolefin resin film, a cellulose acetate resin film made of a resin such as triacetyl cellulose, diacetyl cellulose, polyethylene terephthalate, polyethylene naphthalate, poly
  • area can be mentioned, such as a polyester-type resin film which consists of resin like butylene terephthalate, a polycarbonate-type resin film, an acrylic resin film, a polypropylene-type resin film.
  • cyclic polyolefin-based resin examples include appropriate commercial products such as Topas (registered trademark) (manufactured by Ticona), Arton (registered trademark) (manufactured by JSR Corporation), ZEONOR (registered trademark) (Nippon ZEON ( ZEONEX (registered trademark) (manufactured by Nippon Zeon Co., Ltd.), Apel (registered trademark) (manufactured by Mitsui Chemicals, Inc.) can be suitably used.
  • Topas registered trademark
  • Arton registered trademark
  • ZEONOR registered trademark
  • Nippon ZEON ZEONEX
  • Apel registered trademark
  • Mitsui Chemicals, Inc. a known method such as a solvent casting method or a melt extrusion method is appropriately used.
  • pre-filmed cyclic polyolefins such as Essina (registered trademark) (manufactured by Sekisui Chemical Co., Ltd.), SCA40 (manufactured by Sekisui Chemical Co., Ltd.), Zeonoa (registered trademark) film (manufactured by Optes Co., Ltd.), etc.
  • Essina registered trademark
  • SCA40 manufactured by Sekisui Chemical Co., Ltd.
  • Zeonoa film manufactured by Optes Co., Ltd.
  • a commercial product of a film made of a resin may be used.
  • the cyclic polyolefin resin film may be uniaxially stretched or biaxially stretched.
  • An arbitrary retardation value can be imparted to the cyclic polyolefin-based resin film by stretching. Stretching is usually performed continuously while unwinding the film roll, and is stretched in the heating furnace in the roll traveling direction, the direction perpendicular to the traveling direction, or both.
  • the temperature of the heating furnace is usually in the range from the vicinity of the glass transition temperature of the cyclic polyolefin resin to the glass transition temperature + 100 ° C.
  • the stretching ratio is usually 1.1 to 6 times, preferably 1.1 to 3.5 times in one direction.
  • the cyclic polyolefin resin film generally has poor surface activity
  • surface treatment such as plasma treatment, corona treatment, ultraviolet irradiation treatment, flame (flame) treatment, saponification treatment is performed on the surface to be bonded to the polarizing film.
  • plasma treatment and corona treatment that can be performed relatively easily are preferable.
  • Examples of the cellulose acetate-based resin film include commercially available products such as Fujitac (registered trademark) TD80 (manufactured by Fuji Film Co., Ltd.), Fujitac (registered trademark) TD80UF (manufactured by Fuji Film Co., Ltd.), and Fujitac (registered trademark).
  • TD80UZ Fluji Film Co., Ltd.
  • Fujitac registered trademark
  • TD40UZ Fujiji Film Co., Ltd.
  • KC8UX2M Konica Minolta Opto Co., Ltd.
  • KC4UY Konica Minolta Opto Co., Ltd.
  • a liquid crystal layer or the like may be formed on the surface of the cellulose acetate-based resin film in order to improve viewing angle characteristics. Moreover, in order to provide a phase difference, what stretched the cellulose acetate type-resin film may be used.
  • the cellulose acetate-based resin film is usually subjected to a saponification treatment in order to improve the adhesiveness with the polarizing film.
  • a saponification treatment a method of immersing in an alkaline aqueous solution such as sodium hydroxide or potassium hydroxide can be employed.
  • An optical layer such as a hard coat layer, an antiglare layer, or an antireflection layer can be formed on the surface of the protective film as described above.
  • the method for forming these optical layers on the surface of the protective film is not particularly limited, and a known method can be used.
  • the thickness of the protective film is required to be as thin as possible from the demand for thinning, is preferably 90 ⁇ m or less, and more preferably 50 ⁇ m or less. If it is too thin, the strength is lowered and the processability is poor, and therefore it is preferably 5 ⁇ m or more.
  • FIG. 1 is a flowchart showing an outline of a method for producing a polarizing plate using the present invention.
  • the method for producing a double-sided polarizing laminate film of the present invention includes: A resin layer forming step (S10) of forming a double-sided laminated film by forming a polyvinyl alcohol-based resin layer on both sides of the base film; A stretching step (S20) for stretching the double-sided laminated film; A dyeing step (S30) for forming a polarizer layer by dyeing the polyvinyl alcohol-based resin layer on both sides of the double-sided laminated film after stretching with a dichroic dye and performing a crosslinking treatment in this order. Yes.
  • a drying step (S60) for drying the double-sided laminated film or the single-sided laminated film, and Peeling step of peeling the polarizing plate, the polarizing plate with the base film or the single-sided polarizing laminated film from the double-sided or single-sided laminated film (S70) Are performed in this order.
  • the method for producing a double-sided polarizing laminate film of the present invention is characterized by forming a polyvinyl alcohol-based resin layer on both sides as well as on one side of the base film.
  • the double-sided laminated film which consists of a base film and a polyvinyl alcohol-type resin layer is obtained by forming a polyvinyl alcohol-type resin layer on both surfaces of a base film.
  • the materials suitable for the base film are as described in the explanation of the configuration of the polarizing laminated film.
  • the materials constituting the two polyvinyl alcohol-based resin layers formed on both sides of the base film are preferably the same material. In the case of different materials, the curl suppression effect may be reduced.
  • the difference in thickness between the two resin layers is preferably 3 ⁇ m or less.
  • the specific thickness of the resin layer formed in the resin layer forming step (S10) is preferably 3 to 50 ⁇ m, and more preferably 5 to 40 ⁇ m. If it is thinner than 3 ⁇ m, it may become thinner after stretching, which may reduce the dyeability. On the other hand, if it exceeds 50 ⁇ m, the thickness of the finally obtained polarizer layer may exceed 10 ⁇ m.
  • the polyvinyl alcohol-based resin layer is preferably dried by applying a polyvinyl alcohol-based resin solution obtained by dissolving a polyvinyl alcohol-based resin powder in a good solvent onto one surface of the base film and evaporating the solvent. It is formed by doing. By forming the polyvinyl alcohol-based resin layer in this manner, the polyvinyl alcohol-based resin can be thinned.
  • a method of coating a polyvinyl alcohol resin solution on a base film As a method of coating a polyvinyl alcohol resin solution on a base film, a wire bar coating method, a reverse coating, a roll coating method such as gravure coating, a die coating method, a comma coating method, a lip coating method, a spin coating method, a screen A known method such as a coating method, a fountain coating method, a dipping method, or a spray method can be appropriately selected and employed.
  • the drying temperature is, for example, 50 to 200 ° C., preferably 60 to 150 ° C.
  • the drying time is, for example, 2 to 20 minutes.
  • the application of the polyvinyl alcohol-based resin layer to both surfaces of the base film can be performed in order one side at a time using the above-described method, or can be performed using a dipping method, a spray coating method, or other special equipment.
  • a polyvinyl alcohol-type resin layer can also be apply
  • a primer layer may be provided between the base film and the polyvinyl alcohol resin layer.
  • the primer layer is preferably formed from a composition containing a polyvinyl alcohol-based resin and a crosslinking agent from the viewpoint of adhesion. Materials suitable for the primer layer are as described in the description of the configuration of the polarizing plate.
  • the order of application to the base film is not particularly limited.
  • a polyvinyl alcohol resin layer may be formed on both sides of the primer layer.
  • the primer layer and the polyvinyl alcohol-based resin layer may be sequentially formed on one surface of the base film, and then the primer layer and the resin layer may be sequentially formed on the other surface of the base film.
  • the double-sided laminated film obtained in the resin layer forming step (S10) is stretched.
  • uniaxial stretching is performed so that the stretching ratio is more than 5 times and not more than 17 times. More preferably, it is uniaxially stretched so that the stretch ratio is more than 5 times and not more than 8 times.
  • the draw ratio is 5 times or less, the polyvinyl alcohol resin layer is not sufficiently oriented, and as a result, the degree of polarization of the polarizer layer may not be sufficiently high.
  • the stretching process in the stretching step (S20) is not limited to one-stage stretching, and can be performed in multiple stages. In the case of performing in multiple stages, the stretching process is performed so that the stretching ratio is more than 5 times by combining all stages of the stretching process.
  • a longitudinal stretching process performed in the longitudinal direction of the laminated film a lateral stretching process stretching in the width direction, and the like can be performed.
  • the longitudinal stretching method include an inter-roll stretching method and a compression stretching method
  • examples of the transverse stretching method include a tenter method.
  • the stretching treatment in the present invention is preferably performed using a dry stretching method.
  • the polyvinyl alcohol resin film (polarizer layer) that is thinner than before can be stretched at a high magnification without breaking. This is because the polarizing plate to be manufactured can be thinned.
  • the polyvinyl alcohol-type resin layers on both sides of the double-sided laminated film are dyed with a dichroic dye.
  • the dichroic dye include iodine and organic dyes.
  • organic dyes include Red BR, Red LR, Red R, Pink LB, Rubin BL, Bordeaux GS, Sky Blue LG, Lemon Yellow, Blue BR, Blue 2R, Navy RY, Green LG, Violet LB, Violet B, Black H, Black B, Black GSP, Yellow 3G, Yellow R, Orange LR, Orange 3R, Scarlet GL, Scarlet KGL, Congo Red, Brilliant Violet BK, Spura Blue G, Spura Blue GL, Spura Orange GL, Direct Sky Blue, Direct First Orange S, First Black, etc. can be used.
  • One kind of these dichroic substances may be used, or two or more kinds may be used in combination.
  • the dyeing step is performed, for example, by immersing the entire stretched film in a solution (dye solution) containing the dichroic dye.
  • a solution in which the above dichroic dye is dissolved in a solvent can be used.
  • a solvent for the dyeing solution water is generally used, but an organic solvent compatible with water may be further added.
  • the concentration of the dichroic dye is preferably 0.01 to 10% by weight, more preferably 0.02 to 7% by weight, and particularly preferably 0.025 to 5% by weight.
  • iodine When iodine is used as the dichroic dye, it is preferable to further add an iodide because the dyeing efficiency can be further improved.
  • the iodide include potassium iodide, lithium iodide, sodium iodide, zinc iodide, aluminum iodide, lead iodide, copper iodide, barium iodide, calcium iodide, tin iodide, and iodide.
  • examples include titanium.
  • the addition ratio of these iodides is preferably 0.01 to 20% by weight in the dyeing solution.
  • the ratio of iodine to potassium iodide is preferably in the range of 1: 5 to 1: 100, more preferably in the range of 1: 6 to 1:80 by weight. And particularly preferably in the range of 1: 7 to 1:70.
  • the immersion time of the stretched film in the dyeing solution is not particularly limited, but is usually preferably in the range of 15 seconds to 15 minutes, and more preferably 1 minute to 3 minutes.
  • the temperature of the dyeing solution is preferably in the range of 10 to 60 ° C., more preferably in the range of 20 to 40 ° C.
  • a crosslinking treatment can be performed after dyeing.
  • the crosslinking treatment is performed, for example, by immersing the laminated film in a solution containing a crosslinking agent (crosslinking solution).
  • crosslinking solution Conventionally known substances can be used as the crosslinking agent. Examples thereof include boron compounds such as boric acid and borax, glyoxal, and glutaraldehyde. One kind of these may be used, or two or more kinds may be used in combination.
  • crosslinking solution a solution in which a crosslinking agent is dissolved in a solvent can be used.
  • solvent for example, water can be used, but an organic solvent compatible with water may be further included.
  • concentration of the crosslinking agent in the crosslinking solution is not limited to this, but is preferably in the range of 1 to 20% by weight, more preferably 6 to 15% by weight.
  • An iodide may be added to the crosslinking solution. By adding iodide, the in-plane polarization characteristics of the resin layer can be made more uniform.
  • the iodide include potassium iodide, lithium iodide, sodium iodide, zinc iodide, aluminum iodide, lead iodide, copper iodide, barium iodide, calcium iodide, tin iodide, and titanium iodide. Is mentioned.
  • the iodide content is 0.05 to 15% by weight, more preferably 0.5 to 8% by weight.
  • the immersion time of the stretched film in the crosslinking solution is usually preferably from 15 seconds to 20 minutes, and more preferably from 30 seconds to 15 minutes.
  • the temperature of the crosslinking solution is preferably in the range of 10 to 80 ° C.
  • a polyvinyl alcohol-type resin layer will have a function as a polarizer layer, and a double-sided polarizing laminated film is obtained.
  • washing and drying step (S40) Next, although the washing
  • a water washing treatment can be performed.
  • the water washing treatment can usually be performed by immersing the stretched film in pure water such as ion exchange water or distilled water.
  • the water washing temperature is usually in the range of 3 to 50 ° C., preferably 4 to 20 ° C.
  • the immersion time is usually 2 to 300 seconds, preferably 3 to 240 seconds.
  • washing treatment with an iodide solution and water washing treatment may be combined, and a solution in which liquid alcohol such as methanol, ethanol, isopropyl alcohol, butanol, propanol or the like is appropriately blended may be used.
  • liquid alcohol such as methanol, ethanol, isopropyl alcohol, butanol, propanol or the like.
  • drying preferably includes a drying step at a temperature of 60 ° C. or higher, and more preferably includes a drying step at a temperature of 70 ° C. or higher.
  • a multi-step drying process with different temperatures may be included. In that case, any drying process should just be 60 degreeC or more among multistage drying processes.
  • the hot air circulation method such as the air volume and direction may be optimized, or an IR heater that heats locally may be added. These aids further improve the efficiency of drying and contribute to productivity improvement.
  • the upper limit of the drying temperature is preferably lower than the boiling point of water, and preferably less than 100 ° C. Furthermore, it is preferably 95 ° C. or lower, and most preferably 90 ° C. or lower.
  • a protective film is bonded to one side or both sides of the double-sided laminated film that has undergone the above steps.
  • a method of bonding a polarizer layer and a protective film the method of bonding a polarizer layer and a protective film through an adhesive layer or an adhesive layer is mentioned.
  • Materials suitable as the protective film are as described in the description of the structure of the polarizing plate.
  • the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer is usually a composition in which an acrylic resin, a styrene resin, a silicone resin, or the like is used as a base polymer and a crosslinking agent such as an isocyanate compound, an epoxy compound, or an aziridine compound is added thereto. Become. Furthermore, a pressure-sensitive adhesive layer exhibiting light scattering properties can be formed by mixing fine particles in the pressure-sensitive adhesive.
  • the thickness of the pressure-sensitive adhesive layer is preferably 1 to 40 ⁇ m, but it is preferably applied thinly, and more preferably 3 to 25 ⁇ m, as long as the workability and durability characteristics are not impaired.
  • the thickness is from 3 to 25 ⁇ m, it has good processability and is also suitable for suppressing the dimensional change of the polarizing film.
  • the pressure-sensitive adhesive layer is thinner than 1 ⁇ m, the adhesiveness is lowered, and when it exceeds 40 ⁇ m, problems such as the pressure-sensitive adhesive protruding easily occur.
  • the method of forming the pressure-sensitive adhesive layer on the protective film or the polarizer is not particularly limited, and a solution containing each component including the above-mentioned base polymer is applied to the protective film surface or the polarizer layer surface, After forming the pressure-sensitive adhesive layer by drying, it may be bonded to a separator or other types of film, or after forming the pressure-sensitive adhesive layer on the separator, it is laminated on the protective film surface or the polarizer layer surface. Also good. Further, when forming the pressure-sensitive adhesive layer on the surface of the protective film or the polarizer layer, if necessary, the protective film or the polarizer layer surface, or one or both of the pressure-sensitive adhesive layers may be subjected to an adhesion treatment such as corona treatment. Good.
  • Adhesive layer examples of the adhesive constituting the adhesive layer include a water-based adhesive using a polyvinyl alcohol-based resin aqueous solution, a water-based two-component urethane-based emulsion adhesive, and the like. Among these, a polyvinyl alcohol resin aqueous solution is preferably used.
  • Polyvinyl alcohol resins used as adhesives include vinyl alcohol homopolymers obtained by saponifying polyvinyl acetate, which is a homopolymer of vinyl acetate, as well as other single quantities copolymerizable with vinyl acetate.
  • vinyl alcohol copolymers obtained by saponifying the copolymer with the polymer and modified polyvinyl alcohol polymers obtained by partially modifying the hydroxyl groups.
  • a polyhydric aldehyde, a water-soluble epoxy compound, a melamine compound, a zirconia compound, a zinc compound, or the like may be added as an additive to the water-based adhesive.
  • the thickness of the adhesive layer obtained therefrom is usually much thinner than 1 ⁇ m, and even when the cross section is observed with a normal optical microscope, the adhesive layer is virtually free. Not observed.
  • the method of laminating the film using the water-based adhesive is not particularly limited, and the adhesive is evenly applied or poured on the surface of the film, and the other film is laminated on the coated surface and laminated with a roll or the like. And a drying method.
  • the adhesive is applied at a temperature of 15 to 40 ° C., and the bonding temperature is usually in the range of 15 to 30 ° C.
  • the film When using a water-based adhesive, the film is pasted and dried to remove water contained in the water-based adhesive.
  • the temperature of the drying furnace is preferably 30 ° C to 90 ° C. When the temperature is lower than 30 ° C., the adhesive surface tends to peel off. If the temperature is higher than 90 ° C., the optical performance of a polarizer or the like may be deteriorated by heat.
  • the drying time can usually be 10 to 1000 seconds.
  • the temperature at the time of curing is generally set lower than the temperature adopted at the time of drying.
  • a photo-curable adhesive can be used as the non-aqueous adhesive.
  • the photocurable adhesive include a mixture of a photocurable epoxy resin and a photocationic polymerization initiator.
  • a conventionally known method can be used as a method of laminating a film with a photocurable adhesive.
  • a conventionally known method can be used.
  • casting method Mayer bar coating method, gravure coating method, comma coater method, doctor plate method, die coating method
  • the method include applying an adhesive to the adhesive surface of the film by a dip coating method, a spraying method, and the like, and superimposing two films.
  • the casting method is a method in which two films as an object to be coated are moved in a substantially vertical direction, generally in a horizontal direction, or in an oblique direction between the two, and an adhesive is allowed to flow down and spread on the surface. is there.
  • the film is bonded by sandwiching it with a nip roll or the like.
  • the method of pressing this laminated body with a roll etc. and spreading it uniformly can also be used suitably.
  • a metal, rubber, or the like can be used as the material of the roll.
  • a method in which this laminate is passed between rolls and pressed to spread is preferably employed. In this case, these rolls may be made of the same material or different materials.
  • the thickness of the adhesive layer after being bonded using the nip roll or the like before drying or curing is preferably 5 ⁇ m or less and 0.01 ⁇ m or more.
  • surface treatment such as plasma treatment, corona treatment, ultraviolet irradiation treatment, flame (flame) treatment, and saponification treatment may be appropriately performed on the adhesion surface of the film.
  • saponification treatment include a method of immersing in an aqueous alkali solution such as sodium hydroxide or potassium hydroxide.
  • the photocurable adhesive is cured by irradiating active energy rays after the films are laminated.
  • the light source of the active energy ray is not particularly limited, but an active energy ray having a light emission distribution at a wavelength of 400 nm or less is preferable.
  • the low-pressure mercury lamp, the medium-pressure mercury lamp, the high-pressure mercury lamp, the ultrahigh-pressure mercury lamp, the chemical lamp, and the black light lamp A microwave excitation mercury lamp, a metal halide lamp and the like are preferably used.
  • the light irradiation intensity to the photocurable adhesive is appropriately determined depending on the composition of the photocurable adhesive and is not particularly limited, but the irradiation intensity in the wavelength region effective for activating the polymerization initiator is 0.1 to 6000 mW / it is preferable that the cm 2.
  • the irradiation intensity is 0.1 mW / cm 2 or more, the reaction time does not become too long, and when it is 6000 mW / cm 2 or less, the epoxy is generated by the heat radiated from the light source and the heat generated when the photo-curable adhesive is cured. There is little risk of yellowing of the resin or deterioration of the polarizing film.
  • the light irradiation time to the photocurable adhesive is not particularly limited and is applied according to the photocurable adhesive to be cured, but the integrated light amount expressed as the product of the irradiation intensity and the irradiation time. Is preferably set to be 10 to 10000 mJ / cm 2 . When the cumulative amount of light to the photocurable adhesive is 10 mJ / cm 2 or more, a sufficient amount of active species derived from the polymerization initiator can be generated to allow the curing reaction to proceed more reliably, and at 10,000 mJ / cm 2 or less. In some cases, irradiation time does not become too long and good productivity can be maintained.
  • the thickness of the adhesive layer after irradiation with active energy rays is usually about 0.001 to 5 ⁇ m, preferably 0.01 ⁇ m or more and 2 ⁇ m or less, more preferably 0.01 ⁇ m or more and 1 ⁇ m or less. .
  • drying step (S60) In the said protective film bonding process (S50), when the solution containing a solvent is used in order to form an adhesive bond layer or an adhesive layer, drying of a double-sided bonding film or a single-sided bonding film is implemented.
  • the purpose is mainly to dry the adhesive layer or the pressure-sensitive adhesive layer, and the drying conditions and the like are the same as those in the washing and drying step (S40).
  • an aqueous polyvinyl alcohol resin solution or the like it is preferable to perform drying at a temperature of 60 ° C. or higher.
  • a peeling process (S70) which peels a polarizing plate, a polarizing plate with a substrate film, or a single-sided polarizing laminated film from a double-sided bonding film or a single-sided bonding film is performed after the drying step (S60).
  • the peeling method of a polarizing plate, a polarizing plate with a base film, or a single-sided polarizing laminated film is not particularly limited, and the same method as the peeling film peeling step performed with a normal polarizing plate with an adhesive can be employed.
  • the polarizing plate obtained by the present invention can be used as a polarizing plate in which other optical layers are laminated in practical use. Moreover, the said protective film may have a function of these optical layers.
  • optical layers examples include a reflective polarizing film that transmits certain types of polarized light and reflects polarized light that exhibits the opposite properties, a film with an antiglare function having an uneven shape on the surface, and a surface antireflection function.
  • examples thereof include an attached film, a reflective film having a reflective function on the surface, a transflective film having both a reflective function and a transmissive function, and a viewing angle compensation film.
  • the viewing angle compensation film examples include an optical compensation film coated with a liquid crystal compound on the surface of the substrate and oriented, a retardation film made of a polycarbonate resin, and a retardation film made of a cyclic polyolefin resin.
  • WV film Fluji Film Co., Ltd.
  • NH film Tin Nippon Oil Co., Ltd.
  • NR Examples include films (manufactured by Nippon Oil Corporation).
  • Commercial products corresponding to retardation films made of cyclic polyolefin resins include Arton (registered trademark) film (manufactured by JSR Corporation), Essina (registered trademark) (manufactured by Sekisui Chemical Co., Ltd.), Zeonor ( Registered trademark) film (manufactured by Optes Co., Ltd.).
  • Example 1 Manufacturing up to the double-sided polarizing laminate film 302 was performed as shown in the flowchart of FIG.
  • a base film 1 having a three-layer structure in which a resin layer made of polypropylene (“Sumitomo Nobrene FLX80E4” manufactured by Sumitomo Chemical Co., Ltd., melting point Tm 163 ° C.) is arranged was produced by coextrusion molding using a multilayer extrusion molding machine. .
  • the total thickness of the obtained base film 1 was 90 ⁇ m, and the thickness ratio (FLX80E4 / W151 / FLX80E4) of each layer was 3/4/3.
  • Polyvinyl alcohol powder (trade name: Z-200, manufactured by Nippon Synthetic Chemical Industry Co., Ltd., average polymerization degree 1100, average saponification degree 99.5 mol%) is dissolved in hot water at 95 ° C. and an aqueous solution having a concentration of 3% by weight. Was prepared. The resulting aqueous solution was mixed with 5 parts by weight of a cross-linking agent (manufactured by Sumitomo Chemical Co., Ltd., trade name: Sumirez (registered trademark) Resin 650) with respect to 6 parts by weight of the polyvinyl alcohol powder to obtain a primer solution.
  • a cross-linking agent manufactured by Sumitomo Chemical Co., Ltd., trade name: Sumirez (registered trademark) Resin 650
  • One side of the base film 1 was subjected to corona treatment, and the primer solution was applied using a micro gravure coater and dried at 80 ° C. for 10 minutes to form a primer layer having a thickness of
  • the other surface of the base film was also subjected to corona treatment, and a similar primer solution coating treatment was performed to create a film in which a primer layer was formed on both sides of the base film 1.
  • Polyvinyl alcohol powder (trade name: PVA124, manufactured by Kuraray Co., Ltd., average polymerization degree 2400, average saponification degree 98.0 to 99.0 mol%) is dissolved in 95 ° C. hot water to give a polyvinyl alcohol concentration of 8% by weight.
  • An aqueous alcohol solution was prepared. The obtained aqueous solution was applied to the surface of the primer layer formed on one surface of the base film 1 using a lip coater, continuously at 80 ° C. for 2 minutes, at 70 ° C. for 2 minutes, at 60 ° C. It dried for 4 minutes and produced the two-layered single area layer film 201 which consists of the base film 1 and the polyvinyl alcohol-type resin layer 21. As shown in FIG.
  • the same coating process is performed on the surface of the primer layer formed on the other surface of the base film 1, and both surfaces comprising the polyvinyl alcohol resin layer 21, the base film 1, and the polyvinyl alcohol resin layer 22.
  • a laminated film 202 was created.
  • the thicknesses of the polyvinyl alcohol-based resin layers 21 and 22 (before stretching) at this time were 10.5 ⁇ m and 10.2 ⁇ m, respectively.
  • the double-sided laminated film 202 was subjected to 5.8 times free end uniaxial stretching at 160 ° C. using a roll-to-roll longitudinal stretching machine.
  • the thicknesses of the two polyvinyl alcohol-based resin layers of the double-sided laminated film after stretching were 5.1 ⁇ m and 4.9 ⁇ m, respectively.
  • the double-sided laminated film 202 after stretching was flat with almost no curling, and the handling property in the stretching process was very good.
  • the double-sided laminated film was washed with pure water at 10 ° C. for 4 seconds, and finally dried at 80 ° C. for 300 seconds.
  • the polyvinyl alcohol-based resin layers 21 and 22 formed on both surfaces of the base film 1 were used as the polarizer layers 31 and 32, and a double-sided polarizing laminate film 302 was obtained.
  • curling hardly occurred and a double-sided polarizing laminate film could be continuously formed in a good state.
  • the mixing ratio of the dyeing solution and the crosslinking solution is ⁇ Dyeing solution> Water: 100 parts by weight Iodine: 0.6 parts by weight Potassium iodide: 10 parts by weight ⁇ Crosslinking solution> Water: 100 parts both parts Boric acid: 9.5 parts by weight Potassium iodide: 5 parts by weight
  • Example 2 Production from the double-sided polarizing laminate film 302 to the polarizing plates 501a and 501b was performed as shown in the flowchart of FIG.
  • Polyvinyl alcohol powder (manufactured by Kuraray Co., Ltd., average polymerization degree 1800, trade name: KL-318) was dissolved in 95 ° C. hot water to prepare an aqueous solution having a concentration of 3% by weight.
  • the resulting aqueous solution was mixed with 1 part by weight of a crosslinking agent (manufactured by Sumitomo Chemical Co., Ltd., trade name: Sumirez (registered trademark) Resin 650) with respect to 2 parts by weight of polyvinyl alcohol powder to obtain an adhesive solution.
  • a crosslinking agent manufactured by Sumitomo Chemical Co., Ltd., trade name: Sumirez (registered trademark) Resin 650
  • protective films 41 and 42 (TAC: KC4UY manufactured by Konica Minolta Opto Co., Ltd.) were bonded, and 80
  • the double-sided bonding film 402 which consists of five layers, the protective film 41, the polarizer layer 31, the base film 1, the polarizer layer 42, and the protective film 42 was obtained by making it dry at 5 degreeC.
  • the polarizing plate 501a composed of the polarizer 31 and the protective film 41 was peeled off.
  • the base film was peeled from the remaining film (the film made of the base film 1, the polarizer layer 32, and the protective film 42) to obtain a polarizing plate 501b made of the polarizer layer 32 and the protective film 42.
  • the base film 1 was easily peeled off from the polarizing plates 501a and 501b formed on both surfaces thereof.
  • the thicknesses of the polarizer layers 31 and 32 of the two polarizing plates 501a and 501b thus obtained were both 5.0 ⁇ m.
  • Example 3 A double-sided laminated film was obtained in the same manner as Example 1.
  • the thicknesses of the polyvinyl alcohol resin layers 21 and 22 (before stretching) at this time were 25.2 ⁇ m and 28.7 ⁇ m, respectively.
  • This double-sided laminated film was stretched uniaxially at 5.8 times at 160 ° C. using a tenter stretching device to obtain a stretched film.
  • the thickness of the stretched polyvinyl alcohol resin layer was 4.6 ⁇ m and 4.9 ⁇ m, respectively.
  • the double-sided laminated film 202 after stretching was flat with almost no curling, and the handling property in the stretching process was very good.
  • the stretched double-sided laminated film was dyed in the same manner as in Example 1.
  • curling hardly occurred during drying after dyeing, and a double-sided polarizing laminated film was continuously produced in a good shape. We were able to.
  • Example 4 As shown in the flowchart of FIG. 3, a double-sided polarizing laminate film was obtained by the same method as in Example 1. Thereafter, the protective film 41 is bonded to only one side of the double-sided polarizing laminate film 302 and dried in the same manner as in Example 2, so that the protective film 41 / polarizer layer 31 / substrate film 1 / polarizer is dried. A single-sided bonding film 401 consisting of four layers 32 was obtained.
  • the polarizing plate 501 (the polarizer layer 31 and the protective film 41) was peeled from this film.
  • the remaining base film 1 and polarizer layer 32 become a polarizing laminated film 601. According to such a manufacturing method, the polarizing plate 501 and the single-sided polarizing laminated film 601 can be obtained simultaneously.
  • Comparative Example 1 A stretched film was produced in the same manner as in Example 1 except that the primer layer and the resin layer were provided only on one side of the base film. Since the resin layer was formed only on one side, the obtained film was easily curled and lacked handling properties. Further, when the obtained film was left in an environment of 23 ° C. and 50% RH, the curl further increased.
  • the film manufactured by such a conventional method can be used without any problem as long as it is on the production line and is in a tensioned state. Since it becomes difficult to use, it is not suitable for the case of wanting to include a winding process once for the convenience of the production line.
  • this stretched film was dyed by the same dyeing process as in Example 1 to obtain a polarizing laminated film.
  • significant curling occurred so that the film could not be conveyed, and the end of the film was There was a problem of folding inside. For this reason, a polarizing laminated film could not be obtained continuously and stably.

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Abstract

La présente invention porte sur un procédé pour la production d'un film stratifié polarisant double face comprenant un film de base et une couche polarisante formée sur les deux surfaces du film de base. Le procédé pour la production d'un film stratifié polarisant double face comprend, dans cet ordre, une étape de formation de couche de résine consistant à former une couche de résine de poly(alcool vinylique) sur les deux surfaces du film de base pour obtenir un film stratifié double face, une étape d'étirage consistant à étirer le film stratifié double face et une étape de coloration consistant à colorer, sur les deux côtés du film stratifié double face étiré, la couche de résine de poly(alcool vinylique) avec un colorant dichroïque et effectuer un traitement de réticulation pour former une couche polarisante. Selon la présente invention, pendant la production d'une plaque polarisante mince à forte capacité de polarisation, il est possible de limiter le gondolage du film qui survient à des moments tels que pendant l'étape d'étirage, pendant l'étape de séchage après coloration ou quand le film étiré est stocké.
PCT/JP2012/052439 2011-02-02 2012-01-27 Procédé pour la production de film stratifié polarisant et film stratifié polarisant double face Ceased WO2012105668A1 (fr)

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KR1020137022606A KR101420584B1 (ko) 2011-02-02 2012-01-27 편광성 적층 필름의 제조 방법 및 양면 편광성 적층 필름
KR1020147013615A KR20140085529A (ko) 2011-02-02 2012-01-27 편광성 적층 필름의 제조 방법 및 양면 편광성 적층 필름

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JP2011020675A JP5143918B2 (ja) 2011-02-02 2011-02-02 偏光性積層フィルム、偏光板または基材フィルム付き偏光板の製造方法

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WO2014088122A1 (fr) * 2012-12-07 2014-06-12 住友化学株式会社 Procédé de fabrication de film stratifié de polarisation ainsi que de plaque de polarisation, film stratifié de polarisation, et ensemble de plaques de polarisation
JP2014115404A (ja) * 2012-12-07 2014-06-26 Sumitomo Chemical Co Ltd 偏光性積層フィルムおよび偏光板の製造方法、偏光性積層フィルム、偏光板セット
KR101471570B1 (ko) * 2013-06-20 2014-12-10 에스케이씨 주식회사 고신율의 pva계 복합 필름 및 이를 이용한 편광판의 제조 방법
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CN104395793A (zh) * 2013-06-18 2015-03-04 Lg化学株式会社 拉伸层压体、制造薄偏光片的方法、通过该方法制造的薄偏光片、以及包含该薄偏光片的偏光板
US10114158B2 (en) 2013-06-18 2018-10-30 Lg Chem, Ltd. Stretched laminate, method of manufacturing thin polarizer, thin polarizer manufactured by the method, and polarizing plate including the thin polarizer
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KR101498822B1 (ko) 2012-11-16 2015-03-05 주식회사 엘지화학 박형 편광자의 제조 방법, 이를 이용하여 제조된 박형 편광자 및 편광판
JP5643865B2 (ja) * 2013-03-07 2014-12-17 住友化学株式会社 偏光性積層フィルムの製造方法及び偏光板の製造方法
JP2014174265A (ja) * 2013-03-07 2014-09-22 Sumitomo Chemical Co Ltd 偏光性積層フィルムの製造方法及び偏光板の製造方法
JP2014211548A (ja) * 2013-04-19 2014-11-13 住友化学株式会社 偏光能を示さない領域を有する偏光性積層フィルムの製造方法及び偏光板
WO2014204248A2 (fr) 2013-06-19 2014-12-24 주식회사 엘지화학 Film de base
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JP5863053B2 (ja) 2013-09-06 2016-02-16 日東電工株式会社 偏光膜および偏光膜の製造方法ならびに該偏光膜を用いた画像表示装置
JP5932750B2 (ja) 2013-10-03 2016-06-08 住友化学株式会社 偏光板のセット及び前面板一体型液晶表示パネル
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TW201634283A (zh) 2015-03-31 2016-10-01 住友化學股份有限公司 積層膜、積層膜的製造方法、偏光性積層膜的製造方法、偏光板的製造方法
JP6836849B2 (ja) * 2015-09-24 2021-03-03 日東電工株式会社 光学異方性フィルムの製造方法
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JP2007025008A (ja) * 2005-07-13 2007-02-01 Nitto Denko Corp 光学フィルム、偏光子保護フィルム、これらの製造方法、偏光板、および画像表示装置
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WO2014088122A1 (fr) * 2012-12-07 2014-06-12 住友化学株式会社 Procédé de fabrication de film stratifié de polarisation ainsi que de plaque de polarisation, film stratifié de polarisation, et ensemble de plaques de polarisation
JP2014115404A (ja) * 2012-12-07 2014-06-26 Sumitomo Chemical Co Ltd 偏光性積層フィルムおよび偏光板の製造方法、偏光性積層フィルム、偏光板セット
JP2014115405A (ja) * 2012-12-07 2014-06-26 Sumitomo Chemical Co Ltd 偏光性積層フィルムおよび偏光板の製造方法、偏光性積層フィルム、偏光板セット
CN104395790A (zh) * 2013-06-18 2015-03-04 Lg化学株式会社 具有优异的光学性能的薄膜偏光片、其制造方法和包括所述薄膜偏光片的偏光板和显示装置
CN104395793A (zh) * 2013-06-18 2015-03-04 Lg化学株式会社 拉伸层压体、制造薄偏光片的方法、通过该方法制造的薄偏光片、以及包含该薄偏光片的偏光板
EP2840418A4 (fr) * 2013-06-18 2016-01-06 Lg Chemical Ltd Stratifié étiré, procédé de préparation de polariseur fin, polariseur fin préparé en utilisant ledit procédé et plaque de polarisation comprenant ledit polariseur fin
CN104395790B (zh) * 2013-06-18 2017-05-10 Lg化学株式会社 具有优异的光学性能的薄膜偏光片、其制造方法和包括所述薄膜偏光片的偏光板和显示装置
US10114158B2 (en) 2013-06-18 2018-10-30 Lg Chem, Ltd. Stretched laminate, method of manufacturing thin polarizer, thin polarizer manufactured by the method, and polarizing plate including the thin polarizer
KR101471570B1 (ko) * 2013-06-20 2014-12-10 에스케이씨 주식회사 고신율의 pva계 복합 필름 및 이를 이용한 편광판의 제조 방법
CN115989138A (zh) * 2020-08-27 2023-04-18 日东电工株式会社 光学层叠体及使用了该光学层叠体的偏光板的制造方法

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KR20140085529A (ko) 2014-07-07
KR101420584B1 (ko) 2014-07-16
TW201240807A (en) 2012-10-16
TWI483845B (zh) 2015-05-11
JP5143918B2 (ja) 2013-02-13
JP2012159778A (ja) 2012-08-23
KR20140015348A (ko) 2014-02-06

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