WO2013051596A1 - 偏光板の製造方法 - Google Patents

偏光板の製造方法 Download PDF

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Publication number
WO2013051596A1
WO2013051596A1 PCT/JP2012/075624 JP2012075624W WO2013051596A1 WO 2013051596 A1 WO2013051596 A1 WO 2013051596A1 JP 2012075624 W JP2012075624 W JP 2012075624W WO 2013051596 A1 WO2013051596 A1 WO 2013051596A1
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Prior art keywords
film
roll
adhesive
polarizing
transparent film
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PCT/JP2012/075624
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English (en)
French (fr)
Japanese (ja)
Inventor
古川　淳
梓 廣岩
清水　英満
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住友化学株式会社
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Priority to KR1020147011585A priority Critical patent/KR101956413B1/ko
Priority to CN201280049322.4A priority patent/CN103874942B/zh
Publication of WO2013051596A1 publication Critical patent/WO2013051596A1/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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/28—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer comprising a deformed thin sheet, i.e. the layer having its entire thickness deformed out of the plane, e.g. corrugated, crumpled
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/304—Insulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/416—Reflective
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • B32B2307/7242—Non-permeable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2419/00—Buildings or parts thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles
    • B32B2439/70—Food packaging
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles
    • B32B2439/80—Medical packaging

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 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.
  • JP 2004-245925 A JP 2009-134190 A JP 2011-95560 A
  • a polarizing plate obtained by laminating a polarizing film and a transparent film coated with an active energy ray-curable adhesive on one side, bubbles of about 10 to 50 ⁇ m are mixed between the polarizing film and the transparent film. May end up. It is thought that this bubble occurs because air is caught between the polarizing film and the transparent film when the polarizing film and the transparent film are sandwiched while rotating the bonding roll.
  • the present invention has been made in order to solve the above-mentioned problems, and its purpose is a polarizing plate in which a polarizing film and a transparent film coated with an active energy ray-curable adhesive on one side are bonded. Then, it is to provide a method capable of producing a polarizing plate in which bubbles are hardly generated between the polarizing film and the transparent film.
  • the present invention includes a step of producing a polarizing film by subjecting a polyvinyl alcohol resin film to dyeing treatment, boric acid treatment and uniaxial stretching treatment, and a step of applying an active energy ray-curable adhesive to one side of the transparent film; , A process of producing a laminate by laminating the transparent film on one side or both sides of the polarizing film with a laminating roll, and irradiating the laminate with active energy rays And a step of producing a polarizing plate, wherein the diameter of the laminating roll used in the step of producing the laminate is in the range of 30 to 270 mm.
  • the viscosity of the adhesive is preferably 80 mPa ⁇ s or less.
  • a polarizing plate in which a polarizing film and a transparent film coated with an active energy ray-curable adhesive on one side are bonded, and there are bubbles between the polarizing film and the transparent film.
  • Manufacture of a polarizing plate that is difficult to generate is provided.
  • the method for producing a polarizing plate of the present invention includes: [1] a step of producing a polarizing film by subjecting a polyvinyl alcohol resin film to dyeing treatment, boric acid treatment and uniaxial stretching treatment; and [2] active on one side of the transparent film.
  • a step of applying an energy ray curable adhesive includes: [3] a laminated body in which the transparent film is bonded to one or both sides of the polarizing film with the adhesive-coated surface sandwiched between bonding rolls. And [4] irradiating the laminate with active energy rays to produce a polarizing plate.
  • the diameter of the laminating roll used in the step [3] is in the range of 30 to 270 mm.
  • the diameter of the bonding roll is preferably in the range of 40 to 250 mm, and more preferably in the range of 80 to 200 mm.
  • 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. When they are the same as each other, both are within the above range.
  • at least one of the rolls is 40 to 250 mm.
  • a combination of a diameter of 120 mm and 250 mm, a combination of a diameter of 80 mm and 170 mm, and the like are appropriately selected.
  • positioned by one is a metal roll among the bonding rolls which became a pair, and the bonding roll arrange
  • a rubber roll is preferred.
  • Various known materials can be used as the base material of the metal roll, but stainless steel is preferable, and SUS304 (stainless steel containing 18% Cr and 8% Ni) is more preferable.
  • the surface of the metal roll is preferably subjected to chrome plating.
  • the material of the rubber roll is not particularly limited, and examples thereof include NBR (nitrile rubber), Titan, urethane, silicone, EPDM (ethylene-propylene-diene rubber), and preferably NBR, Titan, and urethane.
  • the hardness of the rubber roll is not particularly limited, but is usually 60 to 100 °, preferably 85 to 95 °.
  • the hardness of the rubber roll can be measured with a hardness meter in accordance with JISK6253.
  • a hardness meter for example, a rubber hardness meter “Type-A” manufactured by Asuka Corporation is used. Specifically, the resistance of the surface of the rubber roll when the surface is pressed with a stick or the like is measured with a hardness meter.
  • the rubber roll disposed on one side is a crown roll having a tapered outer peripheral shape whose diameter decreases from the center to the end (that is, the radius of the center is larger than the radius of the end).
  • the other metal roll that is not the crown roll is preferably a flat roll having a substantially uniform diameter.
  • the diameter of the bonding roll mentioned above shall point out the diameter in the center part of a crown roll.
  • the shape of the crown roll is preferably designed so that the distance between the crown roll and the flat roll is substantially uniform in a state where pressing is performed in the bonding step.
  • interval of a crown roll and a flat roll is a space
  • the crown roll and the flat roll are arranged so that the axis of the crown roll and the axis of the flat roll are parallel when no pressure is applied.
  • the bonding roll arranged on the upper side is a metal flat roll
  • the bonding roll arranged on the lower side is a rubber crown roll
  • the flat roll bearing Pressure is applied to the member in the direction of the crown roll.
  • the crown roll bends when this pressure is applied, but if the shape of the crown roll is designed so that the distance between the crown roll and the flat roll is substantially uniform, the laminate can be made uniform. Can be pressurized. Even when the crown roll is pressed in the flat roll direction, the same effect can be obtained. Further, both the flat roll and the crown roll may be pressed in directions close to each other.
  • the ratio of the difference between the diameter of the center portion and the diameter of the end portion is 0.0020 to 0.0500% with respect to the length of the crown roll (length in the axial direction). Is preferred. More preferably, the content is 0.0020 to 0.020%.
  • the shape of the crown roll can be designed so that the distance between the crown roll and the flat roll is uniform in a state where pressing is performed in the bonding step.
  • the tapered outer peripheral shape is preferably an arc shape.
  • the taper-shaped outer peripheral shape of the crown roll being arc-shaped means that the cross section of the crown roll on the surface including the axis of the tapered outer peripheral shape is an arc.
  • the flat roll When the shaft member of the flat roll is pressed in the bonding process, the flat roll often bends so that the outer peripheral shape becomes an arc shape, and the outer peripheral shape of the opposing crown roll has a radius of curvature similar to that. It is because it can make the space
  • the diameter of each of the pair of bonding rolls may be the same or different.
  • the width of the bonding roll is 300 to 3000 mm.
  • the pressure of the pressing is not particularly limited, but when a metal roll and a rubber roll are used as in the present invention, the instantaneous pressure in Fujifilm two-sheet type prescale is 0.2 to 3.0 MPa.
  • the pressure is preferably 0.2 to 2.0 MPa.
  • the pressing pressure of the bonding roll is less than 0.2 MPa, the pressing pressure is insufficient, so that air bubbles are easily mixed.
  • the pressing pressure of the bonding roll exceeds 2.0 MPa, Dams are generated and air bubbles are easily mixed.
  • the pressure of the press with respect to this bonding roll is normally applied to the bearing member of the both ends of a bonding roll.
  • FIG. 1 is a diagram schematically showing an example of the entire apparatus for performing the polarizing plate manufacturing method of the present invention.
  • FIG. 1 the whole manufacturing method of the polarizing plate of this invention is demonstrated in detail.
  • a polarizing film is produced by subjecting a polyvinyl alcohol-based resin film to a dyeing treatment, boric acid treatment and uniaxial stretching treatment.
  • the polarizing film used in 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). 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.
  • 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 500 to 6000 mm.
  • a polyester film such as an olefin film or a PET film may be used as a base material, and a polyvinyl alcohol resin may be applied on both surfaces or one surface thereof.
  • the commercially available polyvinyl alcohol film (vinylon VF-PS # 7500, Kuraray / OPL film M-7500, manufactured by Nihon Gosei) has a thickness of 75 ⁇ m (vinylon VF-PS # 6000, manufactured by Kuraray, vinylon VF-PE #). 6000, manufactured by Kuraray Co., Ltd.) has a thickness of 60 ⁇ m. 30 ⁇ m and the like.
  • 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 80 ° 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 method such as spraying water in the form of a spray during or before and after the washing process, or spraying water from the slit-shaped spraying portion into the film strongly may be appropriately employed.
  • a drying treatment is usually performed to obtain a polarizing film.
  • a method such as blowing off moisture with an air knife or the like in the previous stage of the drying treatment, or sucking up moisture on the surface with a water absorption roll may be appropriately employed.
  • 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 90 ° 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 3 to 50 ⁇ m.
  • polarizing film not only the above method but also a film having a polarizing function produced by another method is adopted as the polarizing film.
  • transparent film transparent film
  • the material constituting the transparent film used in the present invention include cycloolefin resins, cellulose acetate resins, polyester resins such as polyethylene terephthalate, polyethylene naphthalate, and polybutylene terephthalate, polycarbonate resins, and acrylic resins.
  • 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 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 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 resin film As such a cellulose ester 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 Fuji Film), KC4UYW (manufactured by Konica Minolta Opto), KC6UAW (Konica Minolta Opto) KC2UAW (manufactured by Konica Minolta Opto Co., Ltd.) and the like can be suitably used.
  • Fujitac TD80 manufactured by Fuji 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 the dry weight method and is a change in weight after 105 ° C./120 minutes.
  • the transparent film has a function as a retardation film, a function as a brightness enhancement film, a function as a reflection film, a function as a transflective film, a function as a diffusion film, a function as an optical compensation film, etc. It can have an optical function. In this case, 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 thickness of the transparent film used in the present invention is preferably thin, but if it is too thin, the strength is lowered and the processability 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.
  • active energy ray-curable adhesive examples 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, durability, 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. This includes acrylic compositions, acrylamide compositions, epoxy acrylate compositions, urethane compositions, vinyl compositions, and the like.
  • the polymerization and curing method include radical polymerization, cationic polymerization, anionic polymerization, and thermal polymerization.
  • 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, and aliphatic epoxy resins.
  • 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 resin examples include bisphenol type epoxy resins such as diglycidyl ether of bisphenol A, diglycidyl ether of bisphenol F, and diglycidyl ether of bisphenol S; phenol novolac epoxy resin, cresol novolac epoxy resin, 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 each independently 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 similar, 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 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 Examples thereof include glycidyl ether.
  • 1,4-butanediol diglycidyl ether 1,6-hexanediol diglycidyl ether
  • 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 3000 g / equivalent, preferably 50 to 1500 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.
  • 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.
  • 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.
  • the photosensitizer include 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; and others, ⁇ , ⁇ -diethoxyacetophene
  • benzoin derivatives such as benzoin methyl
  • 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, thioranium 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 groups 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 1000 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, and titanium-based inorganic compounds, and examples of the antioxidant include hindered phenol-based antioxidants. 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 preferably 80 mPa ⁇ s or less, and more preferably 50 mPa ⁇ s or less.
  • the viscosity of the active energy ray-curable adhesive exceeds 80 mPa ⁇ s, the lower limit of the thickness where no bubbles are mixed tends to be thick.
  • the viscosity of the active energy ray-curable adhesive is preferably 1 mPa ⁇ s or more, and more preferably 10 mPa ⁇ s or more.
  • the said viscosity points out the viscosity measured with the liquid temperature of 25 degreeC with the E-type viscosity meter.
  • the transparent films 2 and 3 that are continuously drawn out from a state wound in a roll shape have an active energy ray curable adhesive on one side by the adhesive coating devices 11 and 12, respectively.
  • the method of applying the adhesive to the transparent film 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. 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. Examples of commercially available coating apparatuses include MCD (microchamber doctor) manufactured by Fuji Kikai Co., Ltd.
  • the thickness of the applied adhesive is preferably 3.0 ⁇ m or less, more preferably 0. It is 1 to 2.5 ⁇ m, particularly preferably 0.2 to 2.0 ⁇ 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 surface of the polarizing film on which one side or both sides are coated with an active energy ray-curable adhesive is sandwiched between the bonding rolls.
  • the transparent film may be bonded only to either one surface of the polarizing film mentioned above, and may be bonded to both surfaces. When pasted on both sides, each transparent film may be the same or different.
  • the transparent films 2 and 3 that are continuously drawn out from a state wound in a roll shape have an active energy ray curable adhesive on one side by the adhesive coating devices 11 and 12, respectively. Applied. And the transparent film 2 and 3 are respectively laminated
  • Step of irradiating active energy ray to laminate the laminate obtained as described above is irradiated with active energy ray to obtain a polarizing plate.
  • the laminate 4 is then conveyed while being in close contact with the outer peripheral surface of the roll 13.
  • first active energy ray irradiation devices 14 and 15 installed at positions facing the outer peripheral surface of the roll 13, and second and subsequent activities installed further downstream in the transport direction.
  • Energy beam irradiation devices 16, 17, and 18 and a nip roll 19 for conveyance are provided in order along the conveyance direction.
  • the active energy rays are irradiated from the first active energy ray irradiation devices 14, 15 toward the outer peripheral surface of the roll 13, and the adhesive Is cured by polymerization.
  • the second and subsequent active energy ray irradiating devices 16, 17, and 18 arranged on the downstream side in the transport direction are devices for completely polymerizing and curing the adhesive, and may be added or omitted as necessary. it can.
  • the laminate 4 passes through the conveyance nip roll 19 and is wound around the winding roll 20 as a polarizing plate.
  • the roll 13 forms a convex curved surface having a mirror-finished outer peripheral surface.
  • the roll 37 is conveyed while the laminate 37 is in close contact with 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. Further, 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. In that case, the surface temperature of the roll 13 acting as a cooling roll is preferably set to 4 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 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 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 55 mJ / cm 2 or more, preferably is preferably set to be 10 ⁇ 5000mJ / cm 2.
  • the integrated light amount 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 5000 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.
  • 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 “KC4FR-1 (manufactured by Konica Minolta Opto Co., Ltd.)” having a retardation property of 40 ⁇ m thickness and a triacetyl cellulose film “KC8UX2MW” (Konica Minolta Co., Ltd.) having a thickness of 80 ⁇ m are used.
  • the epoxy resin composition (“ADE series”, “KR series”, viscosity: 44 mPa ⁇ s, including a cationic polymerization initiator), which is an ultraviolet curable adhesive, is coated on one side of these with an adhesive. Each was coated using a construction apparatus.
  • the line speed of the polarizing film laminate in the adhesive coating apparatus is 25 m / min
  • the gravure roll is rotated in the direction opposite to the conveying direction of the laminated material
  • the thickness of the adhesive layer is 1.8 ⁇ m, 1 0.7 ⁇ m.
  • a cellulose acetate-based resin film having a thickness difference of 40 ⁇ m on the upper surface of the polarizing film, a triacetyl cellulose film on the lower surface, and a diameter of 250 mm through the epoxy resin composition was prepared.
  • 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 Surprisingly, using a bonding roll having a diameter of 250 mm and using an epoxy resin composition (“KR series” manufactured by ADEKA, viscosity: 100 mPa ⁇ s, including a cationic polymerization initiator) that is an ultraviolet curable adhesive.
  • KR series manufactured by ADEKA, viscosity: 100 mPa ⁇ s, including a cationic polymerization initiator
  • a polarizing plate was produced in the same manner as in Example 1. In the obtained polarizing plate, almost no bubbles having a size of 10 to 50 ⁇ m were visually observed between the polarizing film and the transparent film.
  • Example 1 A polarizing plate was produced in the same manner as in Example 1 except that a bonding roll having a diameter of 300 mm was used and the thickness of the adhesive layer was 2.3 ⁇ m and 1.7 ⁇ m. Regarding the obtained polarizing plate, bubbles having a size of 10 to 50 ⁇ m were visually observed between the polarizing film and the transparent film.
  • a polarizing plate was produced in the same manner as in Example 1, except that a bonding roll having a diameter of 300 mm was used and the thickness of the adhesive layer was 2.5 ⁇ m and 2.8 ⁇ m. Regarding the obtained polarizing plate, bubbles having a size of 10 to 50 ⁇ m were visually observed between the polarizing film and the transparent film.
  • a cellulose acetate-based resin film “KC4FR-1 (manufactured by Konica Minolta Opto Co., Ltd.)” provided with a retardation property of 40 ⁇ m in thickness, and triacetyl cellulose in advance on one side of the polarizing film of Example 1.
  • An epoxy resin composition that is an ultraviolet curable adhesive is prepared on one side of the transparent film (“KR Series” manufactured by ADEKA, viscosity: 44 mPa ⁇ s, including a cationic polymerization initiator). was coated using an adhesive coating apparatus.
  • the line speed of the polarizing film laminated body in an adhesive agent coating apparatus was 30 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 transparent film was nipped and bonded to the polarizing film surface with a bonding roll composed of a metal roll having a diameter of 40 mm and a rubber roll having a diameter of 40 mm via the epoxy resin composition, and then the same as in Example 1. Were irradiated with UV light.
  • a cellulose acetate-based resin film “KC4FR-1 (manufactured by Konica Minolta Opto Co., Ltd.)” provided with a retardation property of 40 ⁇ m in thickness, and triacetyl cellulose in advance on one side of the polarizing film of Example 1.
  • An epoxy resin composition that is an ultraviolet curable adhesive is prepared on one side of the transparent film (“KR Series” manufactured by ADEKA, viscosity: 44 mPa ⁇ s, including a cationic polymerization initiator). was coated using an adhesive coating apparatus.
  • the line speed of the polarizing film laminated body in an adhesive agent coating apparatus was 30 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 transparent film was nipped and bonded to the polarizing film surface with a bonding roll composed of a metal roll having a diameter of 80 mm and a rubber roll having a diameter of 80 mm via the epoxy resin composition, and then the same as in Example 1. Were irradiated with UV light.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
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  • Liquid Crystal (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
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JP6560509B2 (ja) * 2015-03-11 2019-08-14 住友化学株式会社 偏光板の製造方法及び偏光性積層フィルムの保管方法
KR101803942B1 (ko) * 2015-06-23 2017-12-04 주식회사 엘엠에스 벤딩 저감이 가능한 반사편광모듈 및 이를 구비한 백라이트 유닛
JP6756465B2 (ja) * 2015-07-02 2020-09-16 住友化学株式会社 偏光フィルムの製造方法
JP6741440B2 (ja) * 2016-02-29 2020-08-19 住友化学株式会社 積層光学フィルムの製造方法、及び積層光学フィルムの製造装置
JP6898481B2 (ja) * 2018-05-31 2021-07-07 住友化学株式会社 偏光板及び表示装置
JP6653729B2 (ja) * 2018-05-31 2020-02-26 住友化学株式会社 偏光板及び表示装置
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