WO2014007160A1 - 偏光板の製造方法および製造装置 - Google Patents

偏光板の製造方法および製造装置 Download PDF

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Publication number
WO2014007160A1
WO2014007160A1 PCT/JP2013/067806 JP2013067806W WO2014007160A1 WO 2014007160 A1 WO2014007160 A1 WO 2014007160A1 JP 2013067806 W JP2013067806 W JP 2013067806W WO 2014007160 A1 WO2014007160 A1 WO 2014007160A1
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Prior art keywords
film
adhesive
polarizing film
active energy
polarizing
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PCT/JP2013/067806
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English (en)
French (fr)
Japanese (ja)
Inventor
古川　淳
梓 廣岩
悦夫 久米
智康 竹内
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住友化学株式会社
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Application filed by 住友化学株式会社 filed Critical 住友化学株式会社
Priority to KR1020217010216A priority Critical patent/KR102475633B1/ko
Priority to KR1020147031624A priority patent/KR102243122B1/ko
Priority to CN201380034231.8A priority patent/CN104395786B/zh
Publication of WO2014007160A1 publication Critical patent/WO2014007160A1/ja

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
    • G—PHYSICS
    • G02—OPTICS
    • 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
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J5/00—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
    • C09J2203/318—Applications of adhesives in processes or use of adhesives in the form of films or foils for the production of liquid crystal displays
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/40—Additional features of adhesives in the form of films or foils characterized by the presence of essential components
    • C09J2301/416—Additional features of adhesives in the form of films or foils characterized by the presence of essential components use of irradiation
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements

Definitions

  • the present invention relates to a polarizing plate manufacturing method and a manufacturing apparatus useful as one of optical components constituting a liquid crystal display device or the like.
  • Polarizing films are widely used as dichroic dyes adsorbed and oriented on polyvinyl alcohol resin films. Iodine polarizing films using iodine as a dichroic dye and dichroic direct dyes as dichroic Dye-type polarizing films used as pigments are known. These polarizing films are usually used as polarizing plates by laminating a transparent film such as a triacetyl cellulose film on one side or both sides via an adhesive.
  • Patent Document 1 Japanese Patent Laid-Open No. 2004-245925
  • Patent Document 2 Japanese Patent Laid-Open No. 2009-134190
  • Patent Document 3 Special No. 2011-95560
  • JP 2004-245925 A JP 2009-134190 A JP 2011-95560 A
  • the thickness of the active energy ray-curable resin applied on the surface of the transparent film is, for example, 2.0 ⁇ m or less in order to reduce the thickness of the polarizing plate, the transparent film and the polarizing film are bonded. There was a problem that air bubbles were easily mixed in.
  • the present invention has been made to solve the above-described problems, and provides a polarizing plate manufacturing method and a manufacturing apparatus in which mixing of bubbles is suppressed even when the thickness of the active energy ray-curable resin is reduced.
  • the purpose is to do.
  • the present invention relates to a method for producing a polarizing plate in which a transparent film is bonded to one side or both sides of a polarizing film, the adhesive coating applying an active energy ray-curable adhesive to one side or both sides of the polarizing film.
  • the application thickness of the active energy ray-curable adhesive applied to one or both sides of the polarizing film is preferably 0.1 to 2.0 ⁇ m.
  • the adhesive coating step is a step of applying an active energy ray-curable adhesive to one side or both sides of a polarizing film conveyed upward in the vertical direction.
  • the adhesive coating step is a step of applying an active energy ray-curable adhesive to one side or both sides of a polarizing film conveyed downward in the vertical direction.
  • the present invention is a polarizing plate manufacturing apparatus in which a transparent film is bonded to one side or both sides of a polarizing film, the transport means transporting the polarizing film upward in the vertical direction, and transported upward in the vertical direction.
  • An adhesive coating device for applying an active energy ray-curable adhesive on one or both sides of a polarizing film, and a laminate in which a transparent film is laminated on one or both sides of the polarizing film via an adhesive
  • an irradiation apparatus for applying an active energy ray-curable adhesive on one or both sides of a polarizing film, and a laminate in which a transparent film is laminated on one or both sides of the polarizing film via an adhesive
  • a pair of laminating rolls for laminating a transparent film and a polarizing film, and an active energy
  • the present invention is a polarizing plate manufacturing apparatus in which a transparent film is bonded to one side or both sides of a polarizing film, the transporting means for transporting the polarizing film downward in the vertical direction, and transported downward in the vertical direction.
  • An adhesive coating device for applying an active energy ray-curable adhesive on one or both sides of a polarizing film, and a laminate in which the transparent film is laminated on one or both sides of the polarizing film via an adhesive
  • an irradiation apparatus for applying an active energy ray-curable adhesive on one or both sides of a polarizing film, and a laminate in which the transparent film is laminated on one or both sides of the polarizing film via an adhesive
  • a pair of laminating rolls for laminating a transparent film and a polarizing film, and an active energy
  • the polarizing plate produced by the present invention is a polarizing plate in which a transparent film is bonded to one side or both sides of a polarizing film.
  • an adhesive coating step of applying an active energy ray-curable adhesive on one side or both sides of a polarizing film and a transparent film are laminated on one side or both sides of the polarizing film via an adhesive.
  • the laminated body is sandwiched between a pair of laminating rolls that rotate in the conveying direction and pressed, so that the laminating body is irradiated with active energy rays, and a laminating process for laminating the transparent film and the polarizing film.
  • an active energy ray irradiation step for curing the adhesive First, each material used in the production method of the present invention will be described.
  • the polarizing film used in the polarizing plate of the present invention is obtained by adsorbing and orienting a dichroic dye on a uniaxially stretched polyvinyl alcohol resin film.
  • the polyvinyl alcohol-based resin can be obtained by saponifying a polyvinyl acetate-based resin.
  • Polyvinyl acetate resins include polyvinyl acetate, which is a homopolymer of vinyl acetate, and copolymers of vinyl acetate and other monomers copolymerizable therewith (for example, ethylene-vinyl acetate copolymer). Polymer).
  • polyvinyl alcohol resins may be modified. For example, polyvinyl formal modified with aldehydes, polyvinyl acetal, polyvinyl butyral, and the like may be used.
  • a film obtained by forming such a polyvinyl alcohol resin is used as an original film of a polarizing film.
  • the method for forming the polyvinyl alcohol-based resin is not particularly limited, and can be formed by a conventionally known appropriate method.
  • the film thickness of the raw film made of polyvinyl alcohol resin is not particularly limited, but is, for example, about 10 to 150 ⁇ m. Usually, it is supplied in the form of a roll, the thickness is in the range of 20 to 100 ⁇ m, preferably in the range of 30 to 80 ⁇ m, and the industrially practical width is in the range of 1500 to 6000 mm.
  • the commercially available polyvinyl alcohol film (vinylon VF-PS # 7500, Kuraray / OPL film M-7500, Nihon Gosei) has a thickness of 75 ⁇ m (vinylon VF-PS # 6000, Kuraray, vinylon VF-PE #).
  • the original fabric thickness of 6000 (manufactured by Kuraray) is 60 ⁇ m.
  • the polarizing film is usually a process of dyeing a polyvinyl alcohol resin film with a dichroic dye to adsorb the dichroic dye (dyeing process), and a polyvinyl alcohol resin film adsorbed with the dichroic dye is boric acid. It is manufactured through a step of treating with an aqueous solution (boric acid treatment step) and a step of washing with water after the treatment with the boric acid aqueous solution (water washing treatment step).
  • the polyvinyl alcohol-based resin film is usually uniaxially stretched, but this uniaxial stretching may be performed before the dyeing treatment step or during the dyeing treatment step, It may be performed after the dyeing process.
  • the uniaxial stretching may be performed before the boric acid treatment step or during the boric acid treatment step.
  • uniaxial stretching can be performed in these plural stages.
  • the uniaxial stretching may be performed uniaxially between rolls having different peripheral speeds, or may be performed uniaxially using a hot roll. Moreover, the dry-type extending
  • the draw ratio is usually about 3 to 8 times.
  • the dyeing of the polyvinyl alcohol-based resin film with the dichroic dye in the dyeing process is performed, for example, by immersing the polyvinyl alcohol-based resin film in an aqueous solution containing the dichroic dye.
  • the dichroic dye for example, iodine, a dichroic dye or the like is used.
  • dichroic dyes include C.I. I. Dichroic direct dyes composed of disazo compounds such as DIRECT RED 39, and dichroic direct dyes composed of compounds such as trisazo and tetrakisazo are included.
  • the polyvinyl alcohol-type resin film performs the immersion process to water before a dyeing process.
  • iodine When iodine is used as the dichroic dye, a method of dyeing a polyvinyl alcohol-based resin film in an aqueous solution containing iodine and potassium iodide is usually employed.
  • the content of iodine in this aqueous solution is usually 0.01 to 1 part by weight per 100 parts by weight of water, and the content of potassium iodide is usually 0.5 to 20 parts by weight per 100 parts by weight of water.
  • the temperature of the aqueous solution used for dyeing is usually 20 to 40 ° C.
  • the immersion time (dyeing time) in this aqueous solution is usually 20 to 1800 seconds.
  • a method of immersing and dyeing a polyvinyl alcohol-based resin film in an aqueous solution containing an aqueous dichroic dye is usually employed.
  • the content of the dichroic dye in this aqueous solution usually, 1 ⁇ 10 -4 ⁇ 10 parts by weight per 100 parts by weight of water, preferably 1 ⁇ 10 -3 ⁇ 1 parts by weight, particularly preferably 1 ⁇ 10 - 3 to 1 ⁇ 10 ⁇ 2 parts by weight.
  • This aqueous solution may contain an inorganic salt such as sodium sulfate as a dyeing assistant.
  • the temperature of the dye aqueous solution used for dyeing is usually 20 to 80 ° C.
  • the immersion time (dyeing time) in this aqueous solution is usually 10 to 1800 seconds. is there.
  • the boric acid treatment step is performed by immersing a polyvinyl alcohol resin film dyed with a dichroic dye in a boric acid-containing aqueous solution.
  • the amount of boric acid in the boric acid-containing aqueous solution is usually 2 to 15 parts by weight, preferably 5 to 12 parts by weight per 100 parts by weight of water.
  • the boric acid-containing aqueous solution used in this boric acid treatment process preferably contains potassium iodide.
  • the amount of potassium iodide in the boric acid-containing aqueous solution is usually 0.1 to 15 parts by weight, preferably 5 to 12 parts by weight, per 100 parts by weight of water.
  • the immersion time in the boric acid-containing aqueous solution is usually 60 to 1200 seconds, preferably 150 to 600 seconds, and more preferably 200 to 400 seconds.
  • the temperature of the boric acid-containing aqueous solution is usually 40 ° C. or higher, preferably 50 to 85 ° C., more preferably 55 to 75 ° C.
  • the polyvinyl alcohol-based resin film after the boric acid treatment described above is washed with water, for example, by immersing it in water.
  • the temperature of water in the water washing treatment is usually 4 to 40 ° C., and the immersion time is usually 1 to 120 seconds.
  • a drying treatment is usually performed to obtain a polarizing film.
  • the drying process is preferably performed using, for example, a hot air dryer or a far infrared heater.
  • the temperature for the drying treatment is usually 30 to 100 ° C., preferably 50 to 80 ° C.
  • the drying treatment time is usually 60 to 600 seconds, preferably 120 to 600 seconds.
  • the polyvinyl alcohol resin film is subjected to uniaxial stretching, dyeing with a dichroic dye, boric acid treatment and water washing treatment to obtain a polarizing film.
  • the thickness of this polarizing film is usually in the range of 5 to 50 ⁇ m.
  • Transparent film In the present invention, a transparent film is bonded to one side or both sides of the polarizing film described above. When a transparent film is bonded on both surfaces of a polarizing film, each transparent film may be the same or a different type of film.
  • Examples of the material constituting the transparent film include cycloolefin resins, cellulose acetate resins, polyethylene terephthalate, polyethylene naphthalate, polyester resins such as polybutylene terephthalate, polycarbonate resins, acrylic resins, and polypropylene. Examples thereof include film materials that have been widely used in the field.
  • the cycloolefin resin is a thermoplastic resin (also referred to as a thermoplastic cycloolefin resin) having a monomer unit made of a cyclic olefin (cycloolefin), such as norbornene or a polycyclic norbornene monomer.
  • the cycloolefin-based resin may be a hydrogenated product of the above-mentioned cycloolefin ring-opening polymer or a ring-opening copolymer using two or more cycloolefins, and has a cycloolefin, a chain olefin, and a vinyl group.
  • An addition polymer with an aromatic compound or the like may be used. Those having a polar group introduced are also effective.
  • examples of the chain olefin include ethylene and propylene.
  • examples of the aromatic compound having a vinyl group examples include styrene, ⁇ -methylstyrene, and nuclear alkyl-substituted styrene.
  • the monomer unit composed of cycloolefin may be 50 mol% or less (preferably 15 to 50 mol%).
  • the amount of the monomer unit composed of cycloolefin can be made relatively small as described above.
  • the unit of monomer composed of a chain olefin is usually 5 to 80 mol%
  • the unit of monomer composed of an aromatic compound having a vinyl group is usually 5 to 80 mol%.
  • Cycloolefin-based resins may be commercially available products such as Topas (manufactured by Ticona), Arton (manufactured by JSR), ZEONOR (manufactured by Nippon Zeon), ZEONEX (manufactured by Nippon Zeon ( Co., Ltd.), Apel (manufactured by Mitsui Chemicals, Inc.), Oxis (OXIS) (manufactured by Okura Kogyo Co., Ltd.) and the like can be suitably used.
  • a known method such as a solvent casting method or a melt extrusion method is appropriately used.
  • cycloolefin resin films such as Essina (manufactured by Sekisui Chemical Co., Ltd.), SCA40 (manufactured by Sekisui Chemical Co., Ltd.), Zeonoa Film (manufactured by Optes Co., Ltd.), etc. You may use goods.
  • the cycloolefin resin film may be uniaxially stretched or biaxially stretched.
  • Stretching is usually performed continuously while unwinding a film roll, and in a heating furnace, the roll traveling direction (film longitudinal direction), the direction perpendicular to the traveling direction (film width direction), or both Stretched.
  • the temperature of the heating furnace a range from the vicinity of the glass transition temperature of the cycloolefin resin to the glass transition temperature + 100 ° C. is usually employed.
  • the stretching ratio is usually 1.1 to 6 times, preferably 1.1 to 3.5 times.
  • the cycloolefin-based resin film When the cycloolefin-based resin film is in a roll-wound state, the films tend to adhere to each other and easily cause blocking. Therefore, the cycloolefin-based resin film is usually rolled after the protective film is bonded.
  • the surface to be bonded to the polarizing film is subjected to surface treatment such as plasma treatment, corona treatment, ultraviolet irradiation treatment, flame (flame) treatment, and saponification treatment. Is preferred.
  • plasma treatment that can be carried out relatively easily, particularly atmospheric pressure plasma treatment, and corona treatment are preferable.
  • the cellulose acetate-based resin is a cellulose part or a completely esterified product, and examples thereof include a film made of cellulose acetate ester, propionate ester, butyrate ester, and mixed ester thereof. More specifically, a triacetyl cellulose film, a diacetyl cellulose film, a cellulose acetate propionate film, a cellulose acetate butyrate film, and the like can be given.
  • a cellulose ester-based resin film As such a cellulose ester-based resin film, an appropriate commercially available product, for example, Fujitac TD80 (manufactured by Fuji Film Co., Ltd.), Fujitac TD80UF (manufactured by Fuji Film Co., Ltd.), Fujitac TD80UZ (manufactured by Fuji Film Co., Ltd.) KC8UX2M (manufactured by Konica Minolta Opto) KC8UY (manufactured by Konica Minolta Opto) Fujitac TD60UL (manufactured by FUJIFILM Corporation), KC4UYW (manufactured by Konica Minolta Opto), KC6UAW (Konica Minolta Opto) Etc.) can be used preferably.
  • Fujitac TD80 manufactured by Fuji Film Co., Ltd.
  • Fujitac TD80UF manufactured by Fuji Film Co.
  • a cellulose acetate-based resin film imparted with retardation characteristics is also preferably used.
  • Commercially available cellulose acetate resin films with such retardation characteristics include WV BZ 438 (manufactured by FUJIFILM Corporation), KC4FR-1 (manufactured by Konica Minolta Opto), KC4CR-1 (Konica Minolta). Opt Co., Ltd.), KC4AR-1 (Konica Minolta Opto Co., Ltd.) and the like.
  • Cellulose acetate is also called acetyl cellulose or cellulose acetate.
  • the moisture content during the production of the polarizing plate is preferably closer to the equilibrium moisture content in the storage environment of the polarizing plate, for example, a clean room production line or a roll storage warehouse, and depends on the configuration of the laminated film. About 5%, more preferably 2.5% to 3.0%.
  • the numerical value of the moisture content of this polarizing plate was measured by the dry weight method and is a change in weight after 105 ° C./120 minutes.
  • the thickness of the transparent film used in the polarizing plate of the present invention is preferably thin, but if it is too thin, the strength is lowered and the workability is poor. On the other hand, when it is too thick, problems such as a decrease in transparency and a longer curing time after lamination occur. Therefore, a suitable thickness of the transparent film is, for example, 5 to 200 ⁇ m, preferably 10 to 150 ⁇ m, more preferably 10 to 100 ⁇ m.
  • the polarizing film and / or the transparent film may be subjected to corona treatment, flame treatment, plasma treatment, ultraviolet treatment, primer coating treatment, saponification treatment, etc.
  • a surface treatment may be applied.
  • the transparent film may be subjected to surface treatments such as anti-glare treatment, anti-reflection treatment, hard coat treatment, antistatic treatment, and antifouling treatment individually or in combination of two or more.
  • the transparent film and / or the transparent film surface protective layer may contain a UV absorber such as a benzophenone compound or a benzotriazole compound, or a plasticizer such as a phenyl phosphate compound or a phthalate compound.
  • optical functions such as functions as a retardation film, function as a brightness enhancement film, function as a reflection film, function as a transflective film, function as a diffusion film, function as an optical compensation film, etc.
  • a function for example, by laminating an optical functional film such as a retardation film, a brightness enhancement film, a reflection film, a transflective film, a diffusion film, and an optical compensation film on the surface of the transparent film, such a function is achieved.
  • the transparent film itself can be given such a function.
  • the transparent film may have a plurality of functions such as a diffusion film having the function of a brightness enhancement film.
  • the above-mentioned transparent film is subjected to a stretching process described in Japanese Patent No. 2841377, Japanese Patent No. 3094113, or the like, or a process described in Japanese Patent No. 3168850 can be used as a retardation film.
  • the function of can be provided.
  • the retardation characteristics of the retardation film can be appropriately selected, for example, such that the front retardation value is in the range of 5 to 100 nm and the thickness direction retardation value is in the range of 40 to 300 nm.
  • two or more layers having different central wavelengths of selective reflection are formed in the transparent film by forming micropores by a method as described in Japanese Patent Application Laid-Open Nos. 2002-169025 and 2003-29030. By superimposing these cholesteric liquid crystal layers, a function as a brightness enhancement film can be imparted.
  • a function as a reflective film or a transflective film can be imparted.
  • a function as a diffusion film can be imparted.
  • the function as an optical compensation film can be provided by coating and aligning liquid crystalline compounds, such as a discotic liquid crystalline compound, on said transparent film.
  • you may make the transparent film contain the compound which expresses retardation.
  • various optical functional films may be directly bonded to the polarizing film using an appropriate adhesive.
  • optical functional films examples include brightness enhancement films such as DBEF (manufactured by 3M, available from Sumitomo 3M Co., Ltd. in Japan), and viewing angle improvements such as WV films (manufactured by Fuji Film Co., Ltd.).
  • Film, Arton Film (manufactured by JSR Corporation), Zeonoor Film (manufactured by Optes Corporation), Essina (manufactured by Sekisui Chemical Co., Ltd.), VA-TAC (manufactured by Comic Minolta Opto Corporation), Sumikalite (Sumitomo) (Chemical Co., Ltd.) etc. can be mentioned.
  • the polarizing film and the transparent film are bonded via an active energy ray curable adhesive.
  • the active energy ray-curable adhesive include an adhesive made of an epoxy resin composition containing an epoxy resin that is cured by irradiation with active energy rays from the viewpoint of weather resistance, refractive index, cationic polymerization, and the like. .
  • the present invention is not limited to this, and various active energy ray-curable adhesives (organic solvent adhesives, hot melt adhesives, solventless adhesives) that have been used in the manufacture of polarizing plates. Etc.) can be adopted.
  • An epoxy resin means a compound having two or more epoxy groups in a molecule.
  • the epoxy resin contained in the curable epoxy resin composition that is an adhesive is an epoxy resin that does not contain an aromatic ring in the molecule (see, for example, Patent Document 1). It is preferable that Examples of such epoxy resins include hydrogenated epoxy resins, alicyclic epoxy resins, aliphatic epoxy resins, and the like.
  • the hydrogenated epoxy resin is obtained by a method of glycidyl etherifying a nuclear hydrogenated polyhydroxy compound obtained by selectively subjecting a polyhydroxy compound, which is a raw material of an aromatic epoxy resin, to a nuclear hydrogenation reaction under pressure in the presence of a catalyst. Obtainable.
  • aromatic epoxy resins include bisphenol-type epoxy resins such as bisphenol A diglycidyl ether, bisphenol F diglycidyl ether, and bisphenol S diglycidyl ether; phenol novolac epoxy resins, cresol novolac epoxy resins, and hydroxy Examples include novolak-type epoxy resins such as benzaldehyde phenol novolac epoxy resins; glycidyl ethers of tetrahydroxyphenylmethane, glycidyl ethers of tetrahydroxybenzophenone, and polyfunctional epoxy resins such as epoxidized polyvinylphenol.
  • hydrogenated epoxy resins hydrogenated bisphenol A glycidyl ether is preferred.
  • the alicyclic epoxy resin means an epoxy resin having at least one epoxy group bonded to the alicyclic ring in the molecule.
  • the “epoxy group bonded to an alicyclic ring” means a bridged oxygen atom —O— in the structure represented by the following formula. In the following formula, m is an integer of 2 to 5.
  • a compound in which a group in the form of removing one or more hydrogen atoms in (CH 2 ) m in the above formula is bonded to another chemical structure can be an alicyclic epoxy resin.
  • One or more hydrogen atoms in (CH 2 ) m may be appropriately substituted with a linear alkyl group such as a methyl group or an ethyl group.
  • the alicyclic epoxy resin used preferably below is specifically illustrated, it is not limited to these compounds.
  • R 1 and R 2 each independently represent a hydrogen atom or a linear alkyl group having 1 to 5 carbon atoms).
  • R 3 and R 4 each independently represent a hydrogen atom or a linear alkyl group having 1 to 5 carbon atoms, and n represents an integer of 2 to 20).
  • R 5 and R 6 independently of each other represent a hydrogen atom or a linear alkyl group having 1 to 5 carbon atoms, and p represents an integer of 2 to 20).
  • R 7 and R 8 independently of each other represent a hydrogen atom or a linear alkyl group having 1 to 5 carbon atoms, and q represents an integer of 2 to 10).
  • R 9 and R 10 independently of each other represent a hydrogen atom or a linear alkyl group having 1 to 5 carbon atoms, and r represents an integer of 2 to 20).
  • R 11 and R 12 each independently represent a hydrogen atom or a linear alkyl group having 1 to 5 carbon atoms).
  • R 13 and R 14 each independently represent a hydrogen atom or a linear alkyl group having 1 to 5 carbon atoms).
  • R 16 and R 17 each independently represent a hydrogen atom or a linear alkyl group having 1 to 5 carbon atoms).
  • R 18 represents a hydrogen atom or a linear alkyl group having 1 to 5 carbon atoms.
  • the following alicyclic epoxy resins are commercially available or their analogs, and are more preferably used because they are relatively easy to obtain.
  • examples of the aliphatic epoxy resin include polyglycidyl ethers of aliphatic polyhydric alcohols or alkylene oxide adducts thereof. More specifically, 1,4-butanediol diglycidyl ether; 1,6-hexanediol diglycidyl ether; glycerin triglycidyl ether; trimethylolpropane triglycidyl ether; polyethylene glycol diglycidyl ether; propylene Diglycidyl ether of glycol; Polyether of polyether polyol obtained by adding one or more alkylene oxides (ethylene oxide or propylene oxide) to aliphatic polyhydric alcohols such as ethylene glycol, propylene glycol, and glycerin A glycidyl ether etc. are mentioned.
  • the epoxy resin which comprises the adhesive agent which consists of an epoxy-type resin composition may be used individually by 1 type, and may use 2 or more types together.
  • the epoxy equivalent of the epoxy resin used in this composition is usually in the range of 30 to 3,000 g / equivalent, preferably 50 to 1,500 g / equivalent.
  • the epoxy equivalent is less than 30 g / equivalent, the flexibility of the composite polarizing plate after curing may be reduced, or the adhesive strength may be reduced.
  • it exceeds 3,000 g / equivalent the compatibility with other components contained in the adhesive may be lowered.
  • cationic polymerization is preferably used as a curing reaction of the epoxy resin from the viewpoint of reactivity. Therefore, it is preferable to mix
  • the cationic polymerization initiator generates a cationic species or a Lewis acid by irradiation with active energy rays such as visible light, ultraviolet rays, X-rays, and electron beams, and initiates an epoxy group polymerization reaction.
  • a cationic polymerization initiator that generates a cationic species or a Lewis acid by irradiation of active energy rays and initiates a polymerization reaction of an epoxy group is referred to as a “photo cationic polymerization initiator”.
  • the method of curing the adhesive by irradiating with active energy rays using a cationic photopolymerization initiator enables curing at room temperature, reducing the need to consider the distortion due to heat resistance or expansion of the polarizing film, and between the films Is advantageous in that it can be bonded well.
  • the photocationic polymerization initiator acts catalytically by light, it is excellent in storage stability and workability even when mixed with an epoxy resin.
  • photocationic polymerization initiator examples include aromatic diazonium salts; onium salts such as aromatic iodonium salts and aromatic sulfonium salts; iron-allene complexes and the like.
  • aromatic diazonium salt examples include benzenediazonium hexafluoroantimonate, benzenediazonium hexafluorophosphate, benzenediazonium hexafluoroborate, and the like.
  • aromatic iodonium salt examples include diphenyliodonium tetrakis (pentafluorophenyl) borate, diphenyliodonium hexafluorophosphate, diphenyliodonium hexafluoroantimonate, di (4-nonylphenyl) iodonium hexafluorophosphate, and the like.
  • aromatic sulfonium salt examples include triphenylsulfonium hexafluorophosphate, triphenylsulfonium hexafluoroantimonate, triphenylsulfonium tetrakis (pentafluorophenyl) borate, 4,4′-bis (diphenylsulfonio) diphenyl sulfide bis ( Hexafluorophosphate), 4,4′-bis [di ( ⁇ -hydroxyethoxy) phenylsulfonio] diphenyl sulfide, bis (hexafluoroantimonate), 4,4′-bis [di ( ⁇ -hydroxyethoxy) phenylsulfonio ] Diphenyl sulfide bis (hexafluorophosphate), 7- [di (p-toluyl) sulfonio] -2-isopropylthioxanthone hexafluor
  • iron-allene complex examples include xylene-cyclopentadienyl iron (II) hexafluoroantimonate, cumene-cyclopentadienyl iron (II) hexafluorophosphate, xylene-cyclopentadienyl iron (II). -Tris (trifluoromethylsulfonyl) methanide and the like.
  • photocationic polymerization initiators can be easily obtained.
  • “Kayarad PCI-220” and “Kayarad PCI-620” Nippon Kayaku Co., Ltd. )
  • “UVI-6990” manufactured by Union Carbide
  • “Adekaoptomer SP-150” and “Adekaoptomer SP-170” manufactured by ADEKA Corporation
  • “CI-5102”, “ “CIT-1370”, “CIT-1682”, “CIP-1866S”, “CIP-2048S” and “CIP-2064S” aboveve, Nippon Soda Co., Ltd.
  • the photocationic polymerization initiator may be used alone or in combination of two or more.
  • aromatic sulfonium salts are preferably used because they have ultraviolet absorption characteristics even in a wavelength region of 300 nm or more, and thus can provide a cured product having excellent curability and good mechanical strength and adhesive strength.
  • the amount of the cationic photopolymerization initiator is usually 0.5 to 20 parts by weight, preferably 1 part by weight or more, and preferably 15 parts by weight or less based on 100 parts by weight of the epoxy resin.
  • the blending amount of the cationic photopolymerization initiator is less than 0.5 parts by weight with respect to 100 parts by weight of the epoxy resin, curing becomes insufficient, and mechanical strength and adhesive strength tend to decrease.
  • the compounding quantity of a photocationic polymerization initiator exceeds 20 weight part with respect to 100 weight part of epoxy resins, the hygroscopic property of hardened
  • the curable epoxy resin composition may further contain a photosensitizer as necessary.
  • a photosensitizer By using a photosensitizer, the reactivity of cationic polymerization is improved, and the mechanical strength and adhesive strength of the cured product can be improved.
  • the photosensitizer include carbonyl compounds, organic sulfur compounds, persulfides, redox compounds, azo and diazo compounds, halogen compounds, and photoreductive dyes.
  • photosensitizers include, for example, benzoin derivatives such as benzoin methyl ether, benzoin isopropyl ether, and ⁇ , ⁇ -dimethoxy- ⁇ -phenylacetophenone; benzophenone, 2,4-dichlorobenzophenone, o Benzophenone derivatives such as methyl benzoylbenzoate, 4,4′-bis (dimethylamino) benzophenone, and 4,4′-bis (diethylamino) benzophenone; thioxanthone derivatives such as 2-chlorothioxanthone and 2-isopropylthioxanthone; 2 Anthraquinone derivatives such as chloroanthraquinone and 2-methylanthraquinone; acridone derivatives such as N-methylacridone and N-butylacridone; other ⁇ , ⁇ -diethoxyacetophenone, ben Examples include zil, fluorenone
  • the epoxy resin contained in the adhesive is cured by photocationic polymerization, but may be cured by both photocationic polymerization and thermal cationic polymerization. In the latter case, it is preferable to use a photocationic polymerization initiator and a thermal cationic polymerization initiator in combination.
  • thermal cationic polymerization initiator examples include benzylsulfonium salt, thiophenium salt, thiolanium salt, benzylammonium, pyridinium salt, hydrazinium salt, carboxylic acid ester, sulfonic acid ester, and amine imide.
  • thermal cationic polymerization initiators can be easily obtained as commercial products. For example, “Adeka Opton CP77” and “Adeka Opton CP66” (manufactured by ADEKA Corporation), “CI” are available under the trade names.
  • the active energy ray-curable adhesive may further contain a compound that promotes cationic polymerization, such as oxetanes and polyols.
  • Oxetanes are compounds having a 4-membered ring ether in the molecule, such as 3-ethyl-3-hydroxymethyloxetane, 1,4-bis [(3-ethyl-3-oxetanyl) methoxymethyl] benzene, 3 -Ethyl-3- (phenoxymethyl) oxetane, di [(3-ethyl-3-oxetanyl) methyl] ether, 3-ethyl-3- (2-ethylhexyloxymethyl) oxetane, phenol novolac oxetane and the like. These oxetanes can be easily obtained as commercial products.
  • polyols those having no acidic group other than phenolic hydroxyl groups are preferable.
  • polyol compounds having no functional groups other than hydroxyl groups polyester polyol compounds, polycaprolactone polyol compounds, polyol compounds having phenolic hydroxyl groups, polycarbonates A polyol etc. can be mentioned.
  • the molecular weight of these polyols is usually 48 or more, preferably 62 or more, more preferably 100 or more, and preferably 1,000 or less.
  • These polyols are usually contained in the curable epoxy resin composition in a proportion of 50% by weight or less, preferably 30% by weight or less.
  • Active energy ray-curable adhesives include ion trapping agents, antioxidants, chain transfer agents, tackifiers, thermoplastic resins, fillers, flow regulators, leveling agents, plasticizers, antifoaming agents, etc. Additives can be blended.
  • the ion trapping agent include powdered bismuth-based, antimony-based, magnesium-based, aluminum-based, calcium-based, titanium-based, and mixed inorganic compounds.
  • the antioxidant is a hindered phenol-based antioxidant. Etc.
  • Active energy ray-curable adhesives can be used as solventless adhesives that are substantially free of solvent components, but each coating method has an optimum viscosity range, A solvent may be included. It is preferable to use a solvent that dissolves the epoxy resin composition and the like well without degrading the optical performance of the polarizing film.
  • a solvent that dissolves the epoxy resin composition and the like well without degrading the optical performance of the polarizing film.
  • organic solvents such as The viscosity of the active energy ray-curable adhesive used in the present invention is, for example, in the range of about 5 to 1000 mPa ⁇ s, preferably 10 to 200 mPa ⁇ s, and more preferably 20 to 100 mPa ⁇ s.
  • FIG. 1 is a schematic view showing a first embodiment of a polarizing plate production apparatus of the present invention.
  • the adhesive coating apparatuses 11 and 12 for applying an adhesive to both surfaces of the polarizing film 1, the transparent films 2 and 3, and the polarizing film 1 are laminated and laminated.
  • Bonding rolls (nip rolls) 51 and 52 for obtaining the body 4 a roll 13 for bringing the transparent films 2 and 3 and the polarizing film 1 into close contact with each other in the laminate 4, and a position facing the outer peripheral surface of the roll 13
  • the first active energy ray irradiating devices 14 and 15 installed in the first, the second and subsequent active energy ray irradiating devices 16 to 18 installed further downstream in the conveying direction, and the conveying nip roll 19 are conveyed. It is provided in order along the direction.
  • active energy ray curing is performed by the adhesive coating apparatuses 11 and 12 on both surfaces of the polarizing film 1 that is continuously drawn out from the state wound in a roll shape and conveyed upward in the vertical direction by a conveying means (not shown).
  • a mold adhesive is applied (adhesive application process).
  • coated are laminated
  • the transparent film 1 and the polarizing film 2 are pressed by pressing at least one bonding roll in the direction of the other bonding roll while being sandwiched between a pair of bonding rolls 51 and 52 rotating in the transport direction. 3 are bonded together to form a laminate 4 (bonding step).
  • the active energy rays are irradiated from the first active energy ray irradiating devices 14, 15 toward the outer peripheral surface of the roll 13, and bonded.
  • the agent is polymerized and cured (active energy ray irradiation step).
  • the second and subsequent active energy ray irradiation devices 16 to 18 arranged on the downstream side in the transport direction are devices for completely polymerizing and curing the adhesive, and can be added or omitted as necessary.
  • the laminated body 4 passes the nip roll 19 for conveyance, and is wound up by the winding roll 20 as a polarizing plate (polarizing plate winding process).
  • polarizing plate polarizing plate winding process
  • the coating method of the adhesive agent to the polarizing film 1 is not specifically limited, For example, various coating systems, such as a doctor blade, a wire bar, a die coater, a comma coater, a gravure coater, can be utilized. Of these, taking into consideration the thin film coating, the degree of freedom of the pass line, the wideness, etc., gravure rolls are preferable as the adhesive coating apparatuses 11 and 12.
  • the thickness of the applied adhesive is preferably 0.1 to 2.0 ⁇ m, more preferably Is 0.2 ⁇ m to 1.0 ⁇ m.
  • corrugation of the surface of the polarizing film 1 can be coat
  • the thickness of the adhesive applied is adjusted by the draw ratio, which is the speed ratio of the gravure roll to the line speed of the transparent film.
  • draw ratio the speed ratio of the gravure roll to the line speed of the transparent film.
  • the draw ratio gravure roll speed / line speed
  • the coating thickness of the adhesive can be adjusted to 0.1 to 2.0 ⁇ m.
  • the line speed of the polarizing film 1 is set to 10 to 100 m / min
  • the gravure roll is rotated in the direction opposite to the conveying direction of the polarizing film 1
  • the speed of the gravure roll is set to 5 to 1000 m / min.
  • the thickness of the adhesive applied can be adjusted to 0.1 to 2.0 ⁇ m.
  • the polarizing film 1 is conveyed in the vertical direction upward as described above, and the adhesive is applied from both sides of the polarizing film 1 by the adhesive coating apparatuses 11 and 12.
  • the adhesive is applied from both sides of the polarizing film 1 by the adhesive coating apparatuses 11 and 12.
  • an adhesive agent is apply
  • the term “vertically upward” in the present specification is not limited to the vertical direction as long as the adhesive can be applied from both side surfaces. For example, it is within a range of ⁇ 5 degrees with respect to the upward in the vertical direction. Including direction.
  • the adhesive agent coating apparatuses 11 and 12 arrange
  • the application thickness of the adhesive can also be adjusted by the pressure applied to the polarizing film 1 by the pressure applied by the adhesive application devices 11 and 12, but it is difficult to adjust the pressure when arranged at opposing positions. Because it becomes.
  • the adhesive is usually at a predetermined temperature within the range of 15 to 40 ° C. ⁇ 5 ° C. (for example, when the predetermined temperature is 30 ° C., 30 ° C. ⁇ 5 ° C.), preferably ⁇ 3 ° C., more preferably It is applied in an environment adjusted to ⁇ 1 ° C.
  • the transparent films 2 and 3 that are continuously drawn out from the state of being wound in a roll are laminated on both surfaces of the polarizing film 1 to which the adhesive has been applied in the above step via the adhesive.
  • the transparent film 1 and the polarizing film are pressed by pressing the laminating roll 51 in the direction of the laminating roll 52, for example, in a state where the laminate is sandwiched between a pair of laminating rolls 51 and 52 rotating in the transport direction. 2 and 3 are bonded together to form a laminate 4.
  • the pressure applied to the laminate by pressing is not particularly limited, but when using a metal roll and a rubber roll, the instantaneous pressure in a two-sheet type press case made by Fuji Film is 0.2 to 3.0 MPa. Is more preferable, and 0.5 to 2.3 MPa is more preferable.
  • a pair of bonding rolls may have a difference in peripheral speed between one bonding roll and the other bonding roll.
  • the peripheral speed of the bonding roll (1st bonding roll) installed in the surface side bonded to the liquid crystal panel of the laminated body 4 is the opposite side of the bonding roll (2nd bonding roll). It is preferably faster than the peripheral speed.
  • the obtained polarizing plate a curl (positive curl) in which the surface bonded to the liquid crystal panel becomes convex and the opposite surface becomes concave.
  • the obtained polarizing plate is curled (reverse curl) so that the surface to be bonded to the liquid crystal panel is concave and the opposite surface is convex
  • the polarizing plate is bonded to the liquid crystal cell.
  • it does, it will become easy to produce malfunctions, such as a bubble biting in a center part.
  • the ratio of the peripheral speeds of the first laminating roll is more preferably 1.0050 to 1.0200.
  • the peripheral speed of the first laminating roll is faster than this range, the curl amount of the positive curl becomes too large, causing problems such as entrapment of bubbles at the end when laminating the polarizing plate to the liquid crystal cell. This is because, when placed in a harsh environment, the positive curl is further promoted and the end of the polarizing plate may be peeled off from the liquid crystal cell.
  • the roll 13 constitutes a convex curved surface whose outer peripheral surface is mirror-finished, and the laminate 4 is conveyed while closely contacting the surface, and the adhesive is polymerized and cured by the active energy ray irradiation devices 14 and 15 in the process. .
  • the diameter of the roll 13 is not particularly limited when the adhesive is polymerized and cured and the laminate 4 is sufficiently adhered.
  • the roll 13 may be driven or rotated according to the movement of the line of the laminate 4 or may be fixed so that the laminate 4 slides on the surface.
  • the roll 13 may act as a cooling roll for dissipating heat generated in the laminate 4 at the time of polymerization and curing by irradiation with active energy rays.
  • the surface temperature of the cooling roll is preferably set to 20 to 30 ° C.
  • the light source used for polymerizing and curing the adhesive by irradiation with active energy rays is not particularly limited, but is preferably a light source having a light emission distribution at a wavelength of 400 nm or less.
  • Examples of such a light source include a low pressure mercury lamp, a medium pressure mercury lamp, a high pressure mercury lamp, an ultrahigh pressure mercury lamp, a chemical lamp, a black light lamp, a microwave excitation mercury lamp, and a metal halide lamp.
  • the light irradiation intensity to the active energy ray-curable adhesive is determined for each composition of the adhesive and is not particularly limited, but is preferably 10 to 5000 mW / cm 2 .
  • the reaction time becomes too long, and when it exceeds 5000 mW / cm 2 , adhesion occurs due to heat radiated from the lamp and heat generated during polymerization of the composition.
  • yellowing of the epoxy resin composition as a constituent material of the agent or deterioration of the polarizing film may occur.
  • the irradiation intensity is preferably an intensity in a wavelength region effective for activation of the photocationic polymerization initiator, more preferably an intensity in a wavelength region of a wavelength of 400 nm or less, and further preferably a wavelength region of a wavelength of 280 to 320 nm. Strength.
  • the irradiation time of the active energy ray to the active energy ray-curable adhesive is controlled for each composition to be cured and is not particularly limited, but the integrated light amount expressed as the product of the irradiation intensity and the irradiation time is 10 mJ / cm 2 or more, preferably is preferably set to be 10 ⁇ 5,000mJ / cm 2.
  • the integrated light quantity to the adhesive is less than 10 mJ / cm 2 , the generation of active species derived from the initiator is not sufficient, and the adhesive is not sufficiently cured.
  • the integrated light quantity exceeds 5,000 mJ / cm 2 the irradiation time becomes very long, which is disadvantageous for improving productivity.
  • the laminate is irradiated with active energy rays to polymerize and cure the adhesive, but polymerization curing by heating may be used in combination.
  • the irradiation time is 0.1 while applying a tension of 100 to 800 N / m in the longitudinal direction (transport direction) to the laminate 4. It is preferable that the laminate 4 is conveyed at a line speed that is at least 2 seconds. Moreover, it is preferable that the irradiation intensity
  • Integrated light intensity in these whole process is 10 mJ / cm 2 or more, preferably is preferably set to be 10 ⁇ 5,000mJ / cm 2.
  • the irradiation of the active energy ray is preferably performed in a plurality of times.
  • the ratio at which the active energy ray-curable resin is cured, that is, the reaction rate is preferably 90% or more, more preferably 95% or more.
  • ⁇ Polarizing film winding process The tension for winding the laminate (polarizing plate) 4 to 30N / cm 2 ⁇ 150N / cm 2. Preferably, it is 30 N / cm 2 to 120 N / cm 2 . If it is less than 30 N / cm 2, it is not preferable because winding deviation occurs when a long roll is transferred. When it is larger than 150 N / cm 2 , the tightness of the winding is strong and the tarmi is likely to occur.
  • the length of the polarizing plate wound around the core is not particularly limited, but is preferably 100 m or more and 4000 m or less.
  • the diameter of the cylindrical core is preferably 6 inches to 12 inches.
  • the material of the cylindrical core is not particularly limited as long as it can be used in a clean room and does not easily generate dust, and can secure an appropriate strength so that a wide-width polarizing plate can be wound.
  • FRP glass fiber reinforced plastic
  • Etc. can be selected.
  • FIG. 2 is a schematic view showing a second embodiment of the polarizing plate production apparatus of the present invention.
  • the polarizing film 1 that is continuously drawn out from the state wound in a roll shape is conveyed in the vertical direction upward in that the polarizing film 1 is conveyed in the vertical direction downward by a conveyance unit (not shown).
  • a conveyance unit not shown.
  • the term “vertical downward” is not limited to the vertical direction as long as the adhesive can be applied from both sides. For example, a range of ⁇ 5 degrees with respect to the downward downward direction. It is assumed to include the direction inside.
  • the adhesive can be applied from both sides of the polarizing film 1 as in the first embodiment, the polarizing film that bonds the transparent films 2 and 3 to both sides of the polarizing film 1. It is useful for the manufacturing method of a board.
  • corrugation of the surface of the polarizing film 1 can be coat
  • FIG. 3 is a schematic view showing a third embodiment of the polarizing plate production apparatus of the present invention.
  • the active energy ray is not irradiated in a state where the laminate is in close contact with the roll, and therefore the roll 13 and the active energy ray irradiating devices 14 and 15 in FIG. 1 are not provided. Only the manufacturing apparatus of the first embodiment is different.
  • the active energy ray irradiating devices 16, 17, and 18 instead of the first active energy ray irradiating devices 16, 17, and 18 irradiate the laminate 4 with active energy rays and bond them.
  • the agent is polymerized and cured.
  • Preferable conditions such as light irradiation intensity and integrated light amount in the active energy ray irradiation step are the same as preferable conditions in the active energy ray irradiation step in the first embodiment.
  • Other configurations and other processes are the same as those in the first embodiment, and thus description thereof is omitted.
  • the adhesive can be applied from both sides of the polarizing film 1 as in the first embodiment, the polarizing film that bonds the transparent films 2 and 3 to both sides of the polarizing film 1. It is useful for the manufacturing method of a board.
  • corrugation of the surface of the polarizing film 1 can be coat
  • the polarizing plate is manufactured from one polarizing film and one transparent film. Then, in the adhesive coating process, an adhesive is applied to one side of one polarizing film, and in the laminating process, the polarizing film and the transparent film are brought into contact with the one side of the transparent film. In a laminated state, the polarizing film and the transparent film are bonded together by being sandwiched between a pair of bonding rolls.
  • FIG. 4 is a schematic view showing a fourth embodiment of the polarizing plate production apparatus of the present invention.
  • an adhesive coating device 11 for applying an adhesive to one side of the polarizing film 1, the polarizing film 1, and the transparent film 2 are bonded to obtain a laminate 4.
  • Active energy ray irradiating devices 14 and 15, further second and subsequent active energy ray irradiating devices 16 to 18 installed downstream in the conveying direction, and a nip roll 19 for conveying are provided in order along the conveying direction. It has been.
  • an active energy ray-curable adhesive is applied to one surface of the polarizing film 1 that is continuously drawn out from a state wound in a roll shape by an adhesive application device 11 (adhesive application step).
  • surface of the transparent film 2 continuously drawn out from the state wound by roll shape via an adhesive agent is carried out.
  • the polarizing film 2 and the transparent film 1 are bonded by pressing at least one bonding roll in the direction of the other bonding roll while being sandwiched between a pair of rotating bonding rolls 51 and 52.
  • the laminated body 4 is formed (bonding process).
  • the active energy rays are irradiated from the first active energy ray irradiating devices 14, 15 toward the outer peripheral surface of the roll 13, and bonded.
  • the agent is polymerized and cured (active energy ray irradiation step).
  • the second and subsequent active energy ray irradiation devices 16 to 18 arranged on the downstream side in the transport direction are devices for completely polymerizing and curing the adhesive, and can be added or omitted as necessary. The details of each process are the same as those in the first embodiment, and thus are omitted.
  • an adhesive can be applied from one side of the polarizing film 1, it is useful for a method for manufacturing a polarizing plate in which a transparent film is bonded to one side of the polarizing film.
  • corrugation on the surface of a polarizing film can be coat
  • Example 1 a polarizing plate formed by laminating one polarizing film and one transparent film was prepared using the apparatus shown in FIG. 4 described in the fourth embodiment.
  • a 40 ⁇ m thick triacetyl cellulose film “KC4CR-1” (manufactured by Konica Minolta) and a 135 ⁇ m thick composite film laminate (polyvinyl alcohol film “Vinylon VF-PS # 7500” (Kuraray) And a cellulose ester resin film “KC4UYW” (manufactured by Konica Minolta Opto) and a surface protective film “NBO-0424” (manufactured by Fujimori Kogyo Co., Ltd.) with an adhesive layer on the KC4UYW surface.
  • the epoxy resin composition “KR-70T” (made by ADEKA, viscosity: 44 mPa ⁇ s), which is an ultraviolet curable adhesive, is provided on the surface of the polarizing film of the composite film laminate.
  • an adhesive coating device carry the film upward in the vertical direction as shown in FIG. We applied while sending.
  • the line speed of the polarizing film laminated body in an adhesive agent coating apparatus was 25 m / min
  • the gravure roll was rotated in the reverse direction to the conveyance direction of a laminated material
  • the thickness of the adhesive bond layer was 1.0 micrometer.
  • the laminated body in which the triacetyl cellulose film is laminated so as to be in contact with the adhesive applied to the polarizing film is sandwiched between a pair of nip rolls (bonding rolls) having a diameter of 250 mm and pressed with a pressure of 1.0 MPa.
  • the triacetyl cellulose film and the polarizing film were bonded together.
  • the laminate on which the two kinds of films are bonded is transferred at a line speed of 25 m / min while applying a tension of 600 N / m in the longitudinal direction, and the total integrated light amount (of the light irradiation intensity in the wavelength region of wavelengths 280 to 320 nm).
  • the polarizing plate of the present invention can be effectively applied to various display devices including liquid crystal display devices.

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  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
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  • Organic Chemistry (AREA)
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  • Adhesives Or Adhesive Processes (AREA)
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JP6622347B2 (ja) * 2018-04-06 2019-12-18 住友化学株式会社 偏光板の製造方法および製造装置
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JP6947870B2 (ja) * 2018-11-12 2021-10-13 日東電工株式会社 偏光フィルムの製造方法
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