WO2014010511A1 - Manufacturing method for polarizing plate - Google Patents
Manufacturing method for polarizing plate Download PDFInfo
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- WO2014010511A1 WO2014010511A1 PCT/JP2013/068401 JP2013068401W WO2014010511A1 WO 2014010511 A1 WO2014010511 A1 WO 2014010511A1 JP 2013068401 W JP2013068401 W JP 2013068401W WO 2014010511 A1 WO2014010511 A1 WO 2014010511A1
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- film
- roll
- adhesive
- active energy
- polarizing
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- 0 **(CC1OC11)CC1OC1C(C2)O[C@]2*(*)C1 Chemical compound **(CC1OC11)CC1OC1C(C2)O[C@]2*(*)C1 0.000 description 1
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Classifications
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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
- 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
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- 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
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- 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
- C09J201/00—Adhesives based on unspecified macromolecular compounds
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- 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
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- 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
Definitions
- the present invention relates to a method for producing a polarizing plate useful as one of optical components constituting a liquid crystal display device or the like.
- polarizing films polyvinyl alcohol resin films with dichroic dyes adsorbed and oriented are widely used. Iodine polarizing films using iodine as a dichroic dye and dichroic direct dyes in two colors There are known dye-based polarizing films and the like that are functional pigments. 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 Unexamined Patent Application Publication No. 2004-245925
- Patent Document 2 Japanese Unexamined Patent Application Publication No. 2009-134190
- Patent Document 3 Japanese Unexamined Patent Application Publication No. 2011. -95560
- the adhesive When an active energy ray-curable resin is used as an adhesive, the adhesive has a higher viscosity than an adhesive made of other polyvinyl alcohol resins and the like, so a high pressure is applied to a laminate made of a polarizing film and a transparent film. Need to be added. In this case, the wrinkles generated when the polarizing film and the transparent film are narrowed are difficult to escape, and the air bubbles mixed between the two films are difficult to escape to the outside in such a wrinkle portion. There was a problem that deformation such as wrinkles or bubbles could occur. In addition, there is a problem that the flow of conveyance becomes worse and troubles in the manufacturing process are likely to occur.
- JP 2004-245925 A JP 2009-134190 A JP 2011-95560 A
- the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a polarizing plate manufacturing method and a polarizing plate manufacturing apparatus in which deformation of wrinkles and the like and mixing of bubbles are suppressed.
- the present invention is a method for producing 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 to one side or both sides of the transparent film or the polarizing film; At least one bonding roll in a state in which the transparent film is sandwiched between a pair of bonding rolls rotating in the conveying direction, with a laminate in which the transparent film is laminated on one or both sides of the polarizing film via the adhesive.
- At least one of the pair of bonding rolls is a metal roll, and a method is provided in which a coefficient of static friction between the metal roll and a film in contact with the roll is 0.10 to 0.58.
- the pressure applied to the laminate is preferably 0.2 to 3.0 MPa.
- 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, An adhesive coating device for applying an active energy ray-curable adhesive on one side or both sides of the transparent film or the polarizing film; A pair of pastes for laminating the transparent film and the polarizing film by transporting and sandwiching a laminate in which the transparent film is laminated on one or both sides of the polarizing film via the adhesive.
- An active energy ray irradiating device for irradiating the laminate with an active energy ray to cure the adhesive;
- an apparatus in which at least one of the pair of bonding rolls is a metal roll, and a coefficient of static friction between the metal roll and a film in contact with the roll is 0.10 to 0.58.
- the present invention it is possible to provide a polarizing plate in which deformations such as wrinkles and bubbles are suppressed. In addition, the occurrence of troubles in the manufacturing process due to the deterioration in the flow of conveyance is also suppressed.
- 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 resin can be obtained by saponifying a polyvinyl acetate 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.
- Examples of commercially available polyvinyl alcohol-based resin films include vinylon VF-PS # 7500 (manufactured by Kuraray, original fabric thickness is 75 ⁇ m), OPL film M-7500 (manufactured by Nippon Gosei, original fabric thickness is 75 ⁇ m), and vinylon VF-PS. # 6000 (made by Kuraray, original fabric thickness is 60 ⁇ m), vinylon VF-PE # 6000 (made by Kuraray, original fabric thickness is 60 ⁇ m), vinylon VF-PE # 5000 (made by Kuraray, original fabric thickness is 50 ⁇ m), etc. .
- 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), a boric acid aqueous solution of the polyvinyl alcohol resin film adsorbed with the dichroic dye 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. It is also possible to perform uniaxial stretching 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 a water-soluble 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.
- what introduced the polar group may be used.
- examples of the chain olefin include ethylene and propylene
- examples of the aromatic compound having a vinyl group include 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 Since the cycloolefin-based resin film is in a state of being wound on a roll, the films tend to adhere to each other and easily cause blocking. Therefore, a protective film is usually 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 resin film As such a cellulose ester resin film, an appropriate commercially available product, for example, Fujitac TD80 (Fuji Film Co., Ltd.), Fujitac TD80UF (Fuji Film Co., Ltd.), Fujitac TD80UZ (Fuji Film Co., Ltd.) KC8UX2M (manufactured by Konica Minolta Opto), KC8UY (manufactured by Konica Minolta Opto) Fujitac TD60UL (manufactured by Fuji Film), KC4UYW (manufactured by Konica Minolta Opto), KC6UAW (Konica Minolta Opto) Etc.) can be used preferably.
- Fujitac TD80 Fujitac TD80UF (Fuji Film Co., Ltd.)
- Fujitac TD80UZ Fujiji Film Co., Ltd.
- 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 (Fuji Film Co., Ltd.), KC4FR-1 (Konica Minolta Opto Co., Ltd.), and 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 a dry weight method, and is a change in weight before and after drying at 105 ° C. for 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 film (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 an embodiment of a polarizing plate production apparatus of the present invention.
- the adhesive coating apparatuses 11 and 12 for applying an adhesive to one side of the transparent films 2 and 3, and the transparent films 2 and 3 and the polarizing film 1 are bonded.
- the 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 the outer peripheral surface of the roll 13
- First active energy beam irradiating devices 14 and 15 installed at opposite positions, second and subsequent active energy beam irradiating devices 16 to 18 installed further downstream in the transport direction, and a transport nip roll 19 Are provided in order along the transport direction.
- an active energy ray-curable adhesive is applied to one side of the transparent films 2 and 3 that are continuously drawn out from a rolled state by an adhesive application device 11 or 12 ⁇ Adhesive coating Construction process>.
- coated were laminated
- the polarizing film 1 and the transparent films 2 and 3 are pressed by pressing at least one of the bonding rolls in the direction of the other bonding roll in a state of being sandwiched between a pair of bonding rolls 51 and 52 that rotate in the same direction. It is bonded and 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 laminate 4 passes through the conveyance nip roll 19 and is wound around the winding roll 20 as a polarizing plate.
- the method for applying the adhesive to the transparent films 2 and 3 is not particularly limited, and various coating methods such as a doctor blade, a wire bar, a die coater, a comma coater, and a gravure coater can be used. Among these, in consideration of the thin film coating, the degree of freedom of the pass line, the correspondence to the width, etc., the gravure coater is preferable as the adhesive coating apparatus 11, 12.
- the thickness of the applied adhesive is preferably about 0.1 to 10 ⁇ m. More preferably, the thickness is 0.2 ⁇ m to 4 ⁇ m.
- the coating thickness of the adhesive is adjusted by the draw ratio, which is the speed ratio of the gravure roll to the line speed of the transparent film. Generally, by adjusting the draw ratio (gravure roll speed / line speed) to 0.5 to 10, the coating thickness of the adhesive can be adjusted to about 0.1 to 10 ⁇ m.
- the line speed of the transparent films 2 and 3 is set to 10 to 100 m / min
- the gravure roll is rotated in the direction opposite to the conveying direction of the transparent films 2 and 3
- the speed of the gravure roll is set to 5 to 1000 m / min.
- 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 to which the adhesive is applied by the above-described steps are laminated on both surfaces of the polarizing film 1 that is continuously drawn out from the state wound in a roll shape.
- the bonding roll 51 is pressed in the direction of the bonding roll 52 so that the polarizing film 1 and the transparent film are pressed. 2 and 3 are bonded together to form a laminate 4.
- the adhesive is uniformly applied to one side of the transparent films 2, 3, and the polarizing film 1 is overlapped on the surface of the transparent films 2, 3 applied with the bonding rolls 51, 52.
- the adhesive agent is apply
- 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 the Fujifilm two-sheet type prescale is 0.2 to 3.0 MPa. Is more preferable, and 0.5 to 2.5 MPa is more preferable.
- the external force of the press with respect to this bonding roll is normally applied with respect to the bearing member of the both ends of a bonding roll.
- 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 curl (positive curl) that the surface bonded to the liquid crystal panel becomes convex and the opposite surface becomes concave can be given to the obtained polarizing plate.
- a curl (reverse curl) such that the surface to be bonded to the liquid crystal panel is concave and the opposite surface is convex is applied to the resulting polarizing plate, the polarizing plate is bonded to the liquid crystal cell.
- 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 coefficient of static friction between the metal roll and the film is 0.10 to 0.58.
- the static friction coefficient is measured when a film having a known weight is placed horizontally on a metal roll surface to be measured and a force parallel to the contact surface is applied, and when the film starts to slide on the metal roll.
- a portable tribometer (trade name: Muse type 94iII) manufactured by Shinto Chemical Co., Ltd.
- the static friction coefficient is preferably 0.53 or less, and more preferably 0.50 or less.
- the smaller the static friction coefficient is the more preferable it is because the mixing of bubbles is suppressed.
- the coefficient of static friction is too small, a conveyance failure may occur due to slippage between the metal roll and the laminate, and is 0.10 or more. Is good.
- the said static friction coefficient is 0.20 or more.
- the clamping pressure of the laminated body (polarizing film and transparent film) by the bonding rolls 51 and 52 is usually such that the bearings at both ends of one bonding roll 51 are hydraulic, pneumatic, screw, etc. It is performed by pressing with.
- an active energy ray-curable resin as an adhesive, it is necessary to apply a high pressure to the laminate.
- the material of the bonding roll includes metal and rubber.
- One of the pair of bonding rolls is preferably a metal roll, and the other is preferably a rubber roll (a bonding roll having at least an outer peripheral surface made of rubber).
- a pair of bonding rolls are both made of metal, it is difficult to use them continuously because they are easily damaged between the rolls.
- the outer peripheral surfaces of the pair of bonding rolls are both made of rubber, it is difficult to generate high pressure.
- the upper bonding roll to be pressed is usually made of rubber, and the lower bonding roll is made of metal.
- the lower laminating roll is made of metal, and the lower laminating roll is not deformed when pressed because the lower laminating roll is made of metal because the drive motor is attached to the lower laminating roll. It is because it is easy to maintain the peripheral speed of a bonding roll constant.
- the pressing roll (upper) is made of metal, and at least the outer peripheral surface of the other (lower) bonding roll is It is preferably made of rubber.
- the base material of the metal roll various known materials can be used, preferably stainless steel, and more preferably SUS304 (stainless steel containing 18% Cr and 8% Ni). It is preferable that the surface of the metal roll is coated with chromium plating or a fluororesin (for example, PTFE (polytetrafluoroethylene)).
- a fluororesin for example, PTFE (polytetrafluoroethylene)
- the material of the rubber constituting the rubber roll is not particularly limited, and examples thereof include NBR (nitrile rubber), Titan, urethane, silicon, EPDM (ethylene-propylene-diene rubber), and preferably NBR, Titan, and urethane. is there.
- the hardness of the rubber roll is not particularly limited, but is usually 60 to 100 °, preferably 85 to 95 °.
- the hardness of a rubber roll can be measured with the hardness meter based on JISK6253.
- a rubber hardness meter “Type-A” manufactured by Asuka Corporation is used.
- the diameter of each of the pair of bonding rolls 51 and 52 is preferably 50 mm or more and less than 300 mm, more preferably 50 to 250 mm.
- a bonding roll having a relatively small diameter in this way, it becomes difficult for air to be caught between the polarizing film and the transparent film, and the adjustment range of the thickness of the adhesive for preventing bubbles from being caught. Therefore, it is possible to easily manufacture a polarizing plate in which bubbles are not easily generated between the polarizing film and the transparent film.
- the diameter of the bonding roll is 300 mm or more, air is easily caught between the polarizing film and the transparent film.
- the diameter of a bonding roll is less than 50 mm, there exists a malfunction that intensity
- the bonding roll is comprised at least by a pair of roll, the diameter of the roll which became the pair may mutually be the same, and may differ.
- the width of the bonding roll is preferably 300 to 3000 mm.
- the material of the pressing roll includes metal and rubber.
- the pressing roll provided in contact with the metal bonding roll is preferably made of rubber.
- the pressing roll provided in contact with the rubber bonding roll may be made of metal or rubber.
- positioning of a bonding roll and a press roll is not specifically limited, You may arrange
- 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 an 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 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 laminated body 4 in which the adhesive is in an uncured state is preferably irradiated with active energy rays so that the cumulative amount of light while passing through the roll 13 is 10 mJ / cm 2 or more.
- 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 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.
- 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.
- 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 a winding shift is likely to occur when a long roll is transferred. When it is larger than 150 N / cm 2 , the tightening is strong and the slack 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 diameter of the core is preferably as large as possible, more preferably 11 inches, 12 inches, and the like, but if it is too large, it becomes difficult to transport and store.
- 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.
- Example 1> Preparation of polarizing film
- a long polyvinyl alcohol film “OPL film M-7500 (manufactured by Nippon Gosei Co., Ltd.)” having a polymerization degree of 2400, a saponification degree of 99.9 mol%, a thickness of 75 ⁇ m and a width of 3000 mm was used.
- the film was sufficiently swollen by immersing it in a swelling tank containing pure water at 30 ° C. for 80 seconds while keeping the tension state of the film so that the raw film did not loosen.
- the inlet / outlet roll speed ratio accompanying the swelling in the swelling tank was 1.2.
- After draining with a nip roll it was immersed in a water immersion tank containing 30 ° C. pure water for 160 seconds.
- the draw ratio in the machine direction in this tank was 1.09 times.
- uniaxial stretching was performed at a draw ratio of about 1.5 times while being immersed in a dyeing tank containing an aqueous solution of 0.02 / 2.0 / 100 in weight ratio of iodine / potassium iodide / water. Then, while being immersed in a boric acid bath containing an aqueous solution of potassium iodide / boric acid / water at a weight ratio of 12 / 3.7 / 100 at 55.5 ° C. for 130 seconds, the cumulative draw ratio from the original fabric is 5 Uniaxial stretching was performed until it became 7 times. Then, it was immersed at 40 ° C. for 60 seconds in a boric acid bath containing an aqueous solution of potassium iodide / boric acid / water at a weight ratio of 9 / 2.4 / 100.
- an acetic acid cellulose resin film “KC4CR-1 (manufactured by Konica Minolta Opto Co., Ltd.)” having a retardation characteristic of 40 ⁇ m in thickness and a triacetyl cellulose film “KC8UX2MW” (Konica Minolta, Inc.) having a thickness of 80 ⁇ m are used.
- the line speed of the polarizing film laminate in the adhesive coating apparatus is set to 25 m / min
- the adhesive coating apparatus uses a gravure coater
- the gravure roll of the coating part is opposite to the conveying direction of the laminated material.
- the adhesive layer was rotated to a thickness of 2.5 ⁇ m.
- the cellulose acetate-based resin film and the triacetyl cellulose film provided with the retardation characteristics are paired with a pair of nip rolls (bonding rolls) having a diameter of 240 mm through the epoxy resin composition.
- bonding rolls With a pressing pressure of 1.3 MPa (measured with a Fujifilm two-sheet type prescale).
- one side (the cellulose acetate type-resin film side to which the phase difference characteristic was provided) of a pair of bonding rolls is a metal roll, and the other (triacetyl cellulose film side) is a rubber roll.
- the metal roll used was a SUS surface that had been subjected to hard chrome plating and was polished so that the surface roughness was 0.40 s.
- the rubber roll is made of NBR. The metal roll is disposed on the upper side and the rubber roll is disposed on the lower side.
- the static friction coefficient between the metal roll and the cellulose acetate-based resin film provided with the phase difference property in contact with the roll was measured using a portable tribometer (trade name: Muse type 94iII) manufactured by Shinto Chemical Co., Ltd. It was 0.48 when measured.
- the polarizing film on which the above two types of transparent 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 (light irradiation intensity in the wavelength region of wavelengths 280 to 320 nm). )
- UVB ultraviolet rays
- Example 2 Example 1 except that a cycloolefin-based resin film “ZEONOR” (manufactured by Nippon Zeon Co., Ltd.) having a thickness of 50 ⁇ m is used as the transparent film, and the roughness of the metal roll surface is 2.45 s.
- a polarizing plate was produced in the same manner as described above. The coefficient of static friction between the metal roll and the cycloolefin-based resin film in contact with the roll was measured using a portable tribometer (trade name: Muse type 94iII) manufactured by Shinto Chemical Co., Ltd. and found to be 0.28. About the obtained polarizing plate, deformation
- Example 3 As the transparent film, a cycloolefin-based resin film “ZEONOR” (manufactured by Nippon Zeon Co., Ltd.) having a thickness of 50 ⁇ m is used, and the surface roughness of the metal roll is 0.80 s, and the surface is a fluororesin.
- a polarizing plate was produced in the same manner as in Example 1 except that a metal roll coated with the above was used. The surface roughness of the metal roll coated with the fluororesin was 0.80 s.
- the coefficient of static friction between the metal roll and the cycloolefin resin film in contact with the roll was measured using a portable tribometer (trade name: Muse type 94iII) manufactured by Shinto Chemical Co., Ltd. and found to be 0.12. .
- a portable tribometer (trade name: Muse type 94iII) manufactured by Shinto Chemical Co., Ltd. and found to be 0.12. .
- Muse type 94iII manufactured by Shinto Chemical Co., Ltd.
- a polarizing plate was produced in the same manner as in Example 1 except that it was a cycloolefin resin film “ZEONOR” (manufactured by Nippon Zeon Co., Ltd.) having a thickness of 50 ⁇ m as a transparent film.
- the static friction coefficient between the metal roll and the cycloolefin resin film in contact with the roll was measured using a portable tribometer (trade name: Muse type 94iII) manufactured by Shinto Chemical Co., Ltd., and was 0.62. It was.
- a portable tribometer trade name: Muse type 94iII
- the polarizing plate of the present invention can be effectively applied to various display devices including liquid crystal display devices.
Abstract
Description
前記透明フィルムの片面または前記偏光フィルムの片面もしくは両面に、活性エネルギー線硬化型の接着剤を塗布する接着剤塗工工程と、
前記透明フィルムが前記偏光フィルムの片面または両面に前記接着剤を介して積層された積層体を、搬送方向に回転する一対の貼合ロールの間に挟んだ状態で、少なくとも一方の貼合ロールを他方の貼合ロールの方向に押圧することで、前記透明フィルムと前記偏光フィルムとを貼合する貼合工程と、
前記積層体に活性エネルギー線を照射して前記接着剤を硬化させる活性エネルギー線照射工程とを備え、
前記一対の貼合ロールの少なくとも一方は金属製ロールであり、該金属製ロールと、このロールに接するフィルムとの間の静摩擦係数が0.10~0.58である方法を提供する。 The present invention is a method for producing 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 to one side or both sides of the transparent film or the polarizing film;
At least one bonding roll in a state in which the transparent film is sandwiched between a pair of bonding rolls rotating in the conveying direction, with a laminate in which the transparent film is laminated on one or both sides of the polarizing film via the adhesive. A pressing step for bonding the transparent film and the polarizing film by pressing in the direction of the other bonding roll;
An active energy ray irradiation step of irradiating the laminate with an active energy ray to cure the adhesive; and
At least one of the pair of bonding rolls is a metal roll, and a method is provided in which a coefficient of static friction between the metal roll and a film in contact with the roll is 0.10 to 0.58.
前記透明フィルムの片面または前記偏光フィルムの片面もしくは両面に、活性エネルギー線硬化型の接着剤を塗布するための接着剤塗工装置と、
前記透明フィルムが前記偏光フィルムの片面または両面に前記接着剤を介して積層された積層体を、搬送しながら挟圧することにより、前記透明フィルムと前記偏光フィルムとを貼合するための一対の貼合ロールと、
前記積層体に活性エネルギー線を照射して前記接着剤を硬化させるための活性エネルギー線照射装置とを備え、
前記一対の貼合ロールの少なくとも一方は金属製ロールであり、該金属製ロールと、このロールに接するフィルムとの間の静摩擦係数が0.10~0.58である装置を提供する。 Further, 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,
An adhesive coating device for applying an active energy ray-curable adhesive on one side or both sides of the transparent film or the polarizing film;
A pair of pastes for laminating the transparent film and the polarizing film by transporting and sandwiching a laminate in which the transparent film is laminated on one or both sides of the polarizing film via the adhesive. Combined rolls,
An active energy ray irradiating device for irradiating the laminate with an active energy ray to cure the adhesive;
Provided is an apparatus in which at least one of the pair of bonding rolls is a metal roll, and a coefficient of static friction between the metal roll and a film in contact with the roll is 0.10 to 0.58.
本発明の偏光板に用いられる偏光フィルムは、具体的には、一軸延伸したポリビニルアルコール系樹脂フィルムに二色性色素を吸着配向させたものである。ポリビニルアルコール系樹脂は、ポリ酢酸ビニル系樹脂をケン化することにより得られる。ポリ酢酸ビニル系樹脂としては、酢酸ビニルの単独重合体であるポリ酢酸ビニルの他に、酢酸ビニルとこれに共重合可能な他の単量体との共重合体(例えば、エチレン-酢酸ビニル共重合体)などが挙げられる。酢酸ビニルと共重合可能な他の単量体としては、他に、不飽和カルボン酸類、オレフィン類、ビニルエーテル類、不飽和スルホン酸類、アンモニウム基を有するアクリルアミド類などが挙げられる。ポリビニルアルコール系樹脂のケン化度は、85モル%以上、好ましくは90モル%以上、より好ましくは98~100モル%である。ポリビニルアルコール系樹脂の平均重合度は、通常1000~10000、好ましくは1500~5000である。これらのポリビニルアルコール系樹脂は、変性されていてもよく、たとえばアルデヒド類で変性されたポリビニルホルマール、ポリビニルアセタール、ポリビニルブチラールなども使用し得る。 (Polarizing film)
Specifically, 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 resin can be obtained by saponifying a polyvinyl acetate 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). Other monomers that can be copolymerized with vinyl acetate include unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, acrylamides having an ammonium group, and the like. The degree of saponification of the polyvinyl alcohol resin is 85 mol% or more, preferably 90 mol% or more, more preferably 98 to 100 mol%. The average degree of polymerization of the polyvinyl alcohol-based resin is usually 1000 to 10000, preferably 1500 to 5000. These polyvinyl alcohol resins may be modified. For example, polyvinyl formal modified with aldehydes, polyvinyl acetal, polyvinyl butyral, and the like may be used.
本発明において、上述した偏光フィルムの片面または両面には透明フィルムが貼合される。偏光フィルムの両面に透明フィルムが貼合される場合、各々の透明フィルムは同じものであってもよく、異なる種類のフィルムであってもよい。 (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.
偏光フィルムと透明フィルムとは、活性エネルギー線硬化型の接着剤を介して貼合される。活性エネルギー線硬化型の接着剤としては、耐候性や屈折率、カチオン重合性などの観点から、活性エネルギー線の照射により硬化するエポキシ樹脂を含有するエポキシ系樹脂組成物からなる接着剤が挙げられる。ただし、これに限定されるものではなく、従来から偏光板の製造に使用されている各種の活性エネルギー線硬化型の接着剤(有機溶剤系接着剤、ホットメルト系接着剤、無溶剤型接着剤など)が採用可能である。 (Active energy ray-curable adhesive)
The polarizing film and the transparent film are bonded via an active energy ray curable adhesive. Examples of 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. . However, 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.
(i)次式(IX)で示されるエポキシシクロペンチルエーテル類: (Wherein R 15 represents a hydrogen atom or a linear alkyl group having 1 to 5 carbon atoms).
(I) Epoxycyclopentyl ethers represented by the following formula (IX):
上記例示した脂環式エポキシ樹脂の中でも、次の脂環式エポキシ樹脂は、市販されているか、またはその類似物であって、入手が比較的容易である等の理由からより好ましく用いられる。 (Wherein R 18 represents a hydrogen atom or a linear alkyl group having 1 to 5 carbon atoms).
Among the alicyclic epoxy resins exemplified above, the following alicyclic epoxy resins are commercially available or their analogs, and are more preferably used because they are relatively easy to obtain.
(B)4-メチル-7-オキサビシクロ[4.1.0]ヘプタン-3-カルボン酸と(4-メチル-7-オキサ-ビシクロ[4.1.0]ヘプト-3-イル)メタノールとのエステル化物[式(I)において、R1=4-CH3、R2=4-CH3の化合物]、
(C)7-オキサビシクロ[4.1.0]ヘプタン-3-カルボン酸と1,2-エタンジオールとのエステル化物[式(II)において、R3=R4=H、n=2の化合物]、
(D)(7-オキサビシクロ[4.1.0]ヘプト-3-イル)メタノールとアジピン酸とのエステル化物[式(III)において、R5=R6=H、p=4の化合物]、
(E)(4-メチル-7-オキサビシクロ[4.1.0]ヘプト-3-イル)メタノールとアジピン酸とのエステル化物[式(III)において、R5=4-CH3、R6=4-CH3、p=4の化合物]、
(F)(7-オキサビシクロ[4.1.0]ヘプト-3-イル)メタノールと1,2-エタンジオールとのエーテル化物[式(V)において、R9=R10=H、r=2の化合物]。 (A) Esterified product of 7-oxabicyclo [4.1.0] heptane-3-carboxylic acid and (7-oxa-bicyclo [4.1.0] hept-3-yl) methanol [formula (I) In which R 1 = R 2 = H]
(B) 4-methyl-7-oxabicyclo [4.1.0] heptane-3-carboxylic acid and (4-methyl-7-oxa-bicyclo [4.1.0] hept-3-yl) methanol Ester compound of [In the formula (I), R 1 = 4-CH 3 , R 2 = 4-CH 3 compound],
(C) Esterified product of 7-oxabicyclo [4.1.0] heptane-3-carboxylic acid and 1,2-ethanediol [in the formula (II), R 3 = R 4 = H, n = 2 Compound],
(D) (7-oxabicyclo [4.1.0] hept-3-yl) methanol and adipic acid ester compound [in the formula (III), R 5 = R 6 = H, p = 4 compound] ,
(E) (4-Methyl-7-oxabicyclo [4.1.0] hept-3-yl) esterified product of methanol and adipic acid [in formula (III), R 5 = 4-CH 3 , R 6 = 4-CH 3 , p = 4 compound]
(F) Etherified product of (7-oxabicyclo [4.1.0] hept-3-yl) methanol and 1,2-ethanediol [in the formula (V), R 9 = R 10 = H, r = Compound of 2].
次に図面を参照しながら本発明の偏光板の製造装置および製造方法を説明する。図1は本発明の偏光板の製造装置の一実施形態を示す概略図である。 << Production Method of Polarizing Plate >>
Next, the manufacturing apparatus and manufacturing method of the polarizing plate of this invention are demonstrated, referring drawings. FIG. 1 is a schematic view showing an embodiment of a polarizing plate production apparatus of the present invention.
透明フィルム2,3への接着剤の塗工方法は特に限定されないが、例えば、ドクターブレード、ワイヤーバー、ダイコーター、カンマコーター、グラビアコーターなど、種々の塗工方式が利用できる。このうち、薄膜塗工、パスラインの自由度、幅広への対応などを考慮すると、接着剤塗工装置11,12としてはグラビアコーターが好ましい。 <Adhesive coating process>
The method for applying the adhesive to the
本工程では、ロール状に巻回された状態から連続的に繰り出された偏光フィルム1の両面に、上記工程により接着剤が塗布された透明フィルム2,3が接着剤を介して積層される。この積層体を、搬送方向に回転する一対の貼合ロール51,52の間に挟んだ状態で、例えば貼合ロール51を貼合ロール52の方向に押圧することで、偏光フィルム1と透明フィルム2,3とが貼合され、積層体4が形成される。 <Bonding process>
In this step, the
本発明においては、上記一対の貼合ロール51,52の少なくとも一方は金属製ロールであり、該金属製ロールとフィルムとの間の静摩擦係数が0.10~0.58である。ここで、静摩擦係数とは、金属製ロールと、該金属製ロールと接するフィルム(上記透明フィルムまたは上記偏光フィルム)との間の静摩擦係数であり、接触している物体同士が静止している時、外力によって物体が動き出す直前にかかっている際の最大摩擦力として表され、加重をP、比例定数をμとすれば摩擦力Fは「F=μP」によって定義される。該静摩擦係数は、重量が既知であるフィルムを測定対象の金属製ロール面に水平に乗せ、接触面に平行な力を掛けた際、フィルムが金属製ロール上で滑り始める時の力を測定する方法(JISK7125)により求めることができ、例えば、新東化学(株)製のポータブル摩擦計(商品名:ミューズtype94iII)を用いて測定することができる。 [Bonding roll]
In the present invention, at least one of the pair of bonding rolls 51 and 52 is a metal roll, and the coefficient of static friction between the metal roll and the film is 0.10 to 0.58. Here, the static friction coefficient is a static friction coefficient between a metal roll and a film (the transparent film or the polarizing film) in contact with the metal roll, and when the objects in contact with each other are stationary. , Expressed as the maximum frictional force applied immediately before the object starts to move due to an external force. If the weight is P and the proportionality constant is μ, the frictional force F is defined by “F = μP”. The static friction coefficient is measured when a film having a known weight is placed horizontally on a metal roll surface to be measured and a force parallel to the contact surface is applied, and when the film starts to slide on the metal roll. For example, it can be measured using a portable tribometer (trade name: Muse type 94iII) manufactured by Shinto Chemical Co., Ltd.
活性エネルギー線の照射により接着剤の重合硬化を行うために用いる光源は、特に限定されないが、波長400nm以下に発光分布を有する光源であることが好ましい。このような光源としては、例えば、低圧水銀灯、中圧水銀灯、高圧水銀灯、超高圧水銀灯、ケミカルランプ、ブラックライトランプ、マイクロウェーブ励起水銀灯、メタルハライドランプが挙げられる。 <Active energy ray irradiation process>
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 an 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.
積層体(偏光板)4を巻き取る張力を30N/cm2~150N/cm2とする。好ましくは、30N/cm2~120N/cm2である。30N/cm2未満では長尺のロール巻きを移送する際、巻きズレが起きやすいため好ましくない。150N/cm2より大きい場合は、巻き締まりが強く、弛みが発生し易い。 (Polarizing plate 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 a winding shift is likely to occur when a long roll is transferred. When it is larger than 150 N / cm 2 , the tightening is strong and the slack is likely to occur.
(偏光フィルムの作製)
ポリビニルアルコールの原反フィルムとしては、重合度2400、ケン化度99.9モル%、厚み75μm、幅3000mmの長尺のポリビニルアルコールフィルム「OPLフィルム M-7500(日本合成製)」を用いた。 <Example 1>
(Preparation of polarizing film)
As an original film of polyvinyl alcohol, a long polyvinyl alcohol film “OPL film M-7500 (manufactured by Nippon Gosei Co., Ltd.)” having a polymerization degree of 2400, a saponification degree of 99.9 mol%, a thickness of 75 μm and a width of 3000 mm was used.
透明フィルムとして、厚さ40μmの位相差特性が付与された酢酸セルロール系樹脂フィルム「KC4CR-1(コニカミノルタオプト(株)製)」と、厚さ80μmのトリアセチルセルロースフィルム「KC8UX2MW」(コニカミノルタ社製)とを準備し、これらの片面に、紫外線硬化型の接着剤であるエポキシ樹脂組成物「KR-70T」(ADEKA社製)を接着剤塗工装置を用いてそれぞれ塗工した。この際、接着剤塗工装置における偏光フィルム積層体のライン速度を25m/分とし、接着剤塗工装置はグラビアコーターを使用し、塗工部のグラビアロールを積層材の搬送方向と逆方向に回転させ、接着剤層の厚さを2.5μmとした。 (Preparation of polarizing plate)
As a transparent film, an acetic acid cellulose resin film “KC4CR-1 (manufactured by Konica Minolta Opto Co., Ltd.)” having a retardation characteristic of 40 μm in thickness and a triacetyl cellulose film “KC8UX2MW” (Konica Minolta, Inc.) having a thickness of 80 μm are used. The epoxy resin composition “KR-70T” (manufactured by ADEKA), which is an ultraviolet curable adhesive, was applied to each of these surfaces using an adhesive coating apparatus. At this time, the line speed of the polarizing film laminate in the adhesive coating apparatus is set to 25 m / min, the adhesive coating apparatus uses a gravure coater, and the gravure roll of the coating part is opposite to the conveying direction of the laminated material. The adhesive layer was rotated to a thickness of 2.5 μm.
透明フィルムとして、厚さ50μmのシクロオレフィン系樹脂フィルム「ゼオノア(ZEONOR)」(日本ゼオン(株)製)を使用し、金属製ロール表面の粗さが2.45sであること以外は実施例1と同様にして偏光板を作製した。金属ロールとこのロールに接するシクロオレフィン系樹脂フィルムとの間の静摩擦係数を新東化学(株)製のポータブル摩擦計(商品名:ミューズtype94iII)を用いて測定したところ0.28であった。得られた偏光板について、目視で変形は観察されず、偏光フィルムとシクロオレフィン系樹脂フィルムの間に目視で皺等の変形や気泡は観察されなかった。 <Example 2>
Example 1 except that a cycloolefin-based resin film “ZEONOR” (manufactured by Nippon Zeon Co., Ltd.) having a thickness of 50 μm is used as the transparent film, and the roughness of the metal roll surface is 2.45 s. A polarizing plate was produced in the same manner as described above. The coefficient of static friction between the metal roll and the cycloolefin-based resin film in contact with the roll was measured using a portable tribometer (trade name: Muse type 94iII) manufactured by Shinto Chemical Co., Ltd. and found to be 0.28. About the obtained polarizing plate, deformation | transformation was not observed visually, and deformation | transformation of a wrinkle etc. and bubbles were not observed visually between the polarizing film and the cycloolefin-type resin film.
透明フィルムとして、厚さ50μmのシクロオレフィン系樹脂フィルム「ゼオノア(ZEONOR)」(日本ゼオン(株)製)を使用し、金属製ロール表面の粗さが0.80sであり、その表面にフッ素樹脂にてコーティングをしてある金属製ロールを使用したこと以外は実施例1と同様にして偏光板を作製した。なお、フッ素樹脂にてコーティングをした金属製ロールの表面の粗さも0.80sであった。金属製ロールとこのロールに接するシクロオレフィン系樹脂フィルムとの間の静摩擦係数を新東化学(株)製のポータブル摩擦計(商品名:ミューズtype94iII)を用いて測定したところ0.12であった。得られた偏光板について、目視で変形は観察されず、偏光フィルムとシクロオレフィン系樹脂フィルムとの間に目視で皺等の変形や気泡は観察されなかった。 <Example 3>
As the transparent film, a cycloolefin-based resin film “ZEONOR” (manufactured by Nippon Zeon Co., Ltd.) having a thickness of 50 μm is used, and the surface roughness of the metal roll is 0.80 s, and the surface is a fluororesin. A polarizing plate was produced in the same manner as in Example 1 except that a metal roll coated with the above was used. The surface roughness of the metal roll coated with the fluororesin was 0.80 s. The coefficient of static friction between the metal roll and the cycloolefin resin film in contact with the roll was measured using a portable tribometer (trade name: Muse type 94iII) manufactured by Shinto Chemical Co., Ltd. and found to be 0.12. . About the obtained polarizing plate, deformation | transformation was not observed visually, and deformation | transformation of a wrinkle etc. and bubbles were not observed visually between the polarizing film and the cycloolefin-type resin film.
透明フィルムとして、厚さ50μmのシクロオレフィン系樹脂フィルム「ゼオノア(ZEONOR)」(日本ゼオン(株)製)であること以外は実施例1と同様にして偏光板を作製した。金属製ロールとこのロールに接するシクロオレフィン系樹脂フィルムとの間の静摩擦係数を新東化学(株)製のポータブル摩擦計(商品名:ミューズtype94iII)を用いて測定したところ、0.62であった。得られた偏光板ついて、偏光フィルムとシクロオレフィン系樹脂フィルムの間に目視で皺等の変形や気泡が観察された。 <Comparative Example 1>
A polarizing plate was produced in the same manner as in Example 1 except that it was a cycloolefin resin film “ZEONOR” (manufactured by Nippon Zeon Co., Ltd.) having a thickness of 50 μm as a transparent film. The static friction coefficient between the metal roll and the cycloolefin resin film in contact with the roll was measured using a portable tribometer (trade name: Muse type 94iII) manufactured by Shinto Chemical Co., Ltd., and was 0.62. It was. As for the obtained polarizing plate, deformation such as wrinkles and bubbles were visually observed between the polarizing film and the cycloolefin-based resin film.
Claims (3)
- 偏光フィルムの片面または両面に透明フィルムが貼合された偏光板の製造方法であって、
前記透明フィルムの片面または前記偏光フィルムの片面もしくは両面に、活性エネルギー線硬化型の接着剤を塗布する接着剤塗工工程と、
前記透明フィルムが前記偏光フィルムの片面または両面に前記接着剤を介して積層された積層体を、搬送方向に回転する一対の貼合ロールの間に挟んだ状態で、少なくとも一方の貼合ロールを他方の貼合ロールの方向に押圧することで、前記透明フィルムと前記偏光フィルムとを貼合する貼合工程と、
前記積層体に活性エネルギー線を照射して前記接着剤を硬化させる活性エネルギー線照射工程とを備え、
前記一対の貼合ロールの少なくとも一方は金属製ロールであり、該金属製ロールと、このロールに接するフィルムとの間の静摩擦係数が0.10~0.58である方法。 A method for producing a polarizing plate in which a transparent film is bonded to one or both sides of a polarizing film,
An adhesive coating step of applying an active energy ray-curable adhesive to one side or both sides of the transparent film or the polarizing film;
At least one bonding roll in a state in which the transparent film is sandwiched between a pair of bonding rolls rotating in the conveying direction, with a laminate in which the transparent film is laminated on one or both sides of the polarizing film via the adhesive. A pressing step for bonding the transparent film and the polarizing film by pressing in the direction of the other bonding roll;
An active energy ray irradiation step of irradiating the laminate with an active energy ray to cure the adhesive; and
A method in which at least one of the pair of bonding rolls is a metal roll, and a coefficient of static friction between the metal roll and a film in contact with the roll is 0.10 to 0.58. - 前記貼合工程において、少なくとも一方の貼合ロールを他方の貼合ロールの方向に押圧する際に、前記積層体に加えられる圧力は0.2~3.0MPaである、請求項1に記載の方法。 The pressure applied to the laminate when the at least one laminating roll is pressed in the direction of the other laminating roll in the laminating step is 0.2 to 3.0 MPa. Method.
- 偏光フィルムの片面または両面に透明フィルムが貼合された偏光板の製造装置であって、
前記透明フィルムの片面または前記偏光フィルムの片面もしくは両面に、活性エネルギー線硬化型の接着剤を塗布するための接着剤塗工装置と、
前記透明フィルムが前記偏光フィルムの片面または両面に前記接着剤を介して積層された積層体を、搬送しながら挟圧することにより、前記透明フィルムと前記偏光フィルムとを貼合するための一対の貼合ロールと、
前記積層体に活性エネルギー線を照射して前記接着剤を硬化させるための活性エネルギー線照射装置とを備え、
前記一対の貼合ロールの少なくとも一方は金属製ロールであり、該金属製ロールと、このロールに接するフィルムとの間の静摩擦係数が0.10~0.58である装置。 A polarizing plate manufacturing apparatus in which a transparent film is bonded to one or both sides of a polarizing film,
An adhesive coating device for applying an active energy ray-curable adhesive on one side or both sides of the transparent film or the polarizing film;
A pair of pastes for laminating the transparent film and the polarizing film by transporting and sandwiching a laminate in which the transparent film is laminated on one or both sides of the polarizing film via the adhesive. Combined rolls,
An active energy ray irradiating device for irradiating the laminate with an active energy ray to cure the adhesive;
An apparatus in which at least one of the pair of bonding rolls is a metal roll, and a coefficient of static friction between the metal roll and a film in contact with the roll is 0.10 to 0.58.
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- 2013-07-04 JP JP2014524773A patent/JPWO2014010511A1/en active Pending
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JP2012053078A (en) * | 2010-08-31 | 2012-03-15 | Sumitomo Chemical Co Ltd | Method for manufacturing polarizing plate |
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KR20150035568A (en) | 2015-04-06 |
CN104428701A (en) | 2015-03-18 |
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CN104428701B (en) | 2017-07-04 |
TWI602685B (en) | 2017-10-21 |
JPWO2014010511A1 (en) | 2016-06-23 |
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