WO2013047480A1 - Procédé de fabrication d'une plaque de polarisation - Google Patents

Procédé de fabrication d'une plaque de polarisation Download PDF

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Publication number
WO2013047480A1
WO2013047480A1 PCT/JP2012/074487 JP2012074487W WO2013047480A1 WO 2013047480 A1 WO2013047480 A1 WO 2013047480A1 JP 2012074487 W JP2012074487 W JP 2012074487W WO 2013047480 A1 WO2013047480 A1 WO 2013047480A1
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Prior art keywords
film
roll
polarizing
transparent film
adhesive
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PCT/JP2012/074487
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English (en)
Japanese (ja)
Inventor
古川　淳
梓 廣岩
岩田　智
富永　保昌
秀宣 三浦
Original Assignee
住友化学株式会社
富士機械工業株式会社
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Application filed by 住友化学株式会社, 富士機械工業株式会社 filed Critical 住友化学株式会社
Priority to CN201280046921.0A priority Critical patent/CN103842860B/zh
Priority to KR1020147010780A priority patent/KR101710241B1/ko
Publication of WO2013047480A1 publication Critical patent/WO2013047480A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
    • G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
    • G02B5/305—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks including organic materials, e.g. polymeric layers
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • 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
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • B32B2037/1253—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives curable adhesive
    • 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
    • B32B2307/42—Polarizing, birefringent, filtering
    • 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
    • B32B2309/00—Parameters for the laminating or treatment process; Apparatus details
    • B32B2309/08—Dimensions, e.g. volume
    • B32B2309/10—Dimensions, e.g. volume linear, e.g. length, distance, width
    • B32B2309/105—Thickness
    • 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
    • B32B2309/00—Parameters for the laminating or treatment process; Apparatus details
    • B32B2309/14—Velocity, e.g. feed speeds
    • 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
    • B32B2309/00—Parameters for the laminating or treatment process; Apparatus details
    • B32B2309/60—In a particular environment
    • B32B2309/65—Dust free, e.g. clean room
    • 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
    • B32B2310/00—Treatment by energy or chemical effects
    • B32B2310/08—Treatment by energy or chemical effects by wave energy or particle radiation
    • B32B2310/0806—Treatment by energy or chemical effects by wave energy or particle radiation using electromagnetic radiation
    • B32B2310/0831—Treatment by energy or chemical effects by wave energy or particle radiation using electromagnetic radiation using UV radiation
    • 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
    • B32B2457/00—Electrical equipment
    • B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays
    • B32B2457/202—LCD, i.e. liquid crystal displays
    • 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
    • B32B2551/00—Optical elements
    • 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
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/16—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with all layers existing as coherent layers before laminating
    • B32B37/20—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with all layers existing as coherent layers before laminating involving the assembly of continuous webs only
    • B32B37/203—One or more of the layers being plastic

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
  • about 10 to 50 ⁇ m of fine bubbles are mixed between the polarizing film and the transparent film. May end up.
  • This bubble is caused by the rotation speed of the laminating roll and the transport speed of the polarizing film and the transparent film when the polarizing film and the transparent film are sandwiched while rotating the laminating roll.
  • the flow of air toward the laminating roll occurs in the region between the polarizing film and the transparent film, the pressure in the region increases, and air is trapped between the polarizing film and the transparent film. Conceivable.
  • 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 the manufacturing method of the polarizing plate including the process of manufacturing a polarizing plate, Comprising: The process of manufacturing the said laminated body is the wind pressure of the area
  • the manufacturing method of the polarizing plate of this invention is before being bonded by the obstacle installed so that it may interpose between the said polarizing film and the said transparent film before being pinched
  • the manufacturing method of the polarizing plate of the present invention includes the polarizing film before being bonded by sucking air between the polarizing film and the transparent film before being sandwiched and bonded by a bonding roll. You may make it reduce the wind pressure of the area
  • the manufacturing method of the polarizing plate of this invention is blown or sucked in the direction orthogonal to a film conveyance direction between the said polarizing film and the said transparent film before being pinched
  • the wind pressure in the region between the polarizing film and the transparent film before being bonded may be reduced.
  • 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.
  • a method for producing a polarizing plate that is less likely to cause the occurrence of the problem.
  • FIG. 1 is a diagram schematically showing a preferred first example of the present invention.
  • 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.
  • the manufacturing method of the polarizing plate of this invention performs the process of said [3], reducing the wind pressure of the area
  • FIG. 1 shows an example in which a laminated body 4 is produced by sandwiching both surfaces of a polarizing film 1 with transparent films 2 and 3 coated with an active energy ray-curable adhesive on one surface between bonding rolls 5a and 5b.
  • the obstacle 6 is installed so as to be interposed between the polarizing film 1 and the transparent films 2 and 3 before being sandwiched and bonded by the bonding rolls 5 a and 5 b. .
  • the bonding roll in the region between the polarizing film 1 and the transparent film 2 and the region between the polarizing film 1 and the transparent film 3 in front of the bonding roll.
  • the flow of air flowing between 5a and 5b can be disturbed, and the wind pressure in the region can be reduced.
  • the quantity of the air caught between the polarizing film and the transparent film can be reduced, and the generation of bubbles can be suppressed in the obtained polarizing plate.
  • the obstacle 6 is not particularly limited as long as it can disturb the air flow as described above.
  • a plate-like object, a rod-like object, or a string-like object is bonded to a roll. What is necessary is just to install so that it may be interposed in the area
  • the size of such a plate or rod is not particularly limited, but it is preferable to satisfy the air flow as described above over the entire width direction of the film (direction perpendicular to the conveying direction). It is preferable to use one larger than the width direction.
  • a plate-like object, a rod-like object or a string-like object having a thickness or diameter in the range of 0.1 to 30 mm and a length in the range of 600 to 2500 mm is exemplified.
  • the plate-like material, rod-like material, or string-like material may be hollow or solid.
  • There are no particular restrictions on the material of the plate or rod but for example, SUS304, SUS316, metals such as aluminum, carbon fiber, or nylon, Teflon (registered trademark), and liquid crystal polymers such as PEEK and PES. It is preferable to use a plate-like object, a rod-like object or a string-like object formed of a rigid resin such as (LCP).
  • FIG. 2 is a diagram schematically showing a second preferred example of the present invention.
  • it is bonded by sucking the air between the polarizing film 1 and the transparent films 2 and 3 before being sandwiched between the bonding rolls 5a and 5b with the suction means 7.
  • the wind pressure in the region between the polarizing film 1 and the transparent films 2 and 3 before being reduced is reduced.
  • the example shown in FIG. 2 is the same as the example shown in FIG. 1 except that the suction means 7 is used instead of the obstacle 6, and the same components are denoted by the same reference numerals and described. Omitted.
  • FIG. 3 is a diagram schematically showing a preferred third example of the present invention.
  • the film before being sandwiched and bonded by the bonding rolls 5 a and 5 b is only the polarizing film 1 or the laminate 1 ′ of the polarizing film and another film and the transparent film 2, and the suction means 7. 2 is the same as the example shown in FIG. 2 except that it is a suction device (decompression device) as shown in the figure, and the same components are denoted by the same reference numerals and description thereof is omitted.
  • region between the polarizing film 1 and the transparent film 3 in front of the bonding roll. , 5b the air pressure flowing into the space is positively sucked using the suction means 7, so that the wind pressure in the region can be reduced.
  • a suction device as shown in FIG. 3 can be cited.
  • the amount of pressure reduction (differential pressure) in the device is 0.4 kPa or more, preferably 1.0 kPa or more.
  • the pressure is preferably 1.5 to 3.0 kPa.
  • the said pressure reduction amount points out the value which pressure-reduced with the pressure reduction pump and measured the pressure in an apparatus with the differential pressure gauge. Also by doing in this way, the amount of air that is bitten between the polarizing film and the transparent film during bonding can be reduced, and the generation of bubbles in the obtained polarizing plate can be suppressed.
  • the suction means 7 to be used is not particularly limited, and any conventionally known appropriate suction means may be used, but the apparatus having the configuration shown in FIG. 4 is preferably used.
  • FIG. 5 is a diagram schematically showing a fourth preferred example of the present invention.
  • wind is sucked or sucked between the polarizing film 1 and the transparent films 2 and 3 before being sandwiched between the pasting rolls 5 in the direction perpendicular to the film transport direction.
  • the wind pressure in the region between the polarizing film 1 and the transparent films 2 and 3 before being bonded is reduced.
  • the example shown in FIG. 5 is the same as the example shown in FIG. 1 except that air blower or suction means 8 is used instead of the obstacle 6, and the same components are denoted by the same reference numerals. Description is omitted.
  • the air blowing or suction means 8 used is not particularly limited, and any conventionally known appropriate air blowing or suction means may be used. Further, the air blowing or suction direction is not particularly limited, and may be from only one side surface or from both side surfaces.
  • stacked the transparent film or the protective film and the backing film in advance may be sufficient as the structure which bonds 2 in this case, and the transparent film of a polarizing film and the side not bonded.
  • FIG. 6 is a diagram schematically showing an example of the entire apparatus for performing the polarizing plate manufacturing method of the present invention to which the example shown in FIG. 1 is applied
  • FIG. 7 is shown in FIG.
  • FIG. 8 performs the manufacturing method of the polarizing plate of this invention which applied the example shown in FIG.
  • FIG. 9 is a diagram schematically showing an example of the entire apparatus for performing the method for producing a polarizing plate of the present invention to which the example shown in FIG. 5 is applied.
  • 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%.
  • a film obtained by forming such a polyvinyl alcohol resin is used as an original film of a polarizing film.
  • the method for forming the polyvinyl alcohol-based resin is not particularly limited, and can be formed by a conventionally known appropriate method.
  • the film thickness of the raw film made of polyvinyl alcohol resin is not particularly limited, but is, for example, about 10 to 150 ⁇ m. Usually, it is supplied in the form of a roll, the thickness is in the range of 20 to 100 ⁇ m, preferably in the range of 30 to 80 ⁇ m, and the industrially practical width is in the range of 1500 to 6000 mm.
  • the commercially available polyvinyl alcohol film (Vinylon VF-PS # 7500, Kuraray / OPL film M-7500, Nihon Gosei) has a thickness of 75 ⁇ m (Vinylon VF-PS # 6000, Kuraray, Vinylon VF-PE #).
  • the original fabric thickness of 6000 (manufactured by Kuraray) is 60 ⁇ m.
  • the polarizing film is usually a process of dyeing a polyvinyl alcohol resin film with a dichroic dye to adsorb the dichroic dye (dyeing process), and a polyvinyl alcohol resin film adsorbed with the dichroic dye is boric acid. It is manufactured through a step of treating with an aqueous solution (boric acid treatment step) and a step of washing with water after the treatment with the boric acid aqueous solution (water washing treatment step).
  • the polyvinyl alcohol-based resin film is usually uniaxially stretched, but this uniaxial stretching may be performed before the dyeing treatment step or during the dyeing treatment step, It may be performed after the dyeing process.
  • the uniaxial stretching may be performed before the boric acid treatment step or during the boric acid treatment step.
  • uniaxial stretching can be performed in these plural stages.
  • the uniaxial stretching may be performed uniaxially between rolls having different peripheral speeds, or may be performed uniaxially using a hot roll. Moreover, the dry-type extending
  • the draw ratio is usually about 3 to 8 times.
  • the dyeing of the polyvinyl alcohol-based resin film with the dichroic dye in the dyeing process is performed, for example, by immersing the polyvinyl alcohol-based resin film in an aqueous solution containing the dichroic dye.
  • the dichroic dye for example, iodine, a dichroic dye or the like is used.
  • dichroic dyes include C.I. I. Dichroic direct dyes composed of disazo compounds such as DIRECT RED 39, and dichroic direct dyes composed of compounds such as trisazo and tetrakisazo are included.
  • the polyvinyl alcohol-type resin film performs the immersion process to water before a dyeing process.
  • iodine When iodine is used as the dichroic dye, a method of dyeing a polyvinyl alcohol-based resin film in an aqueous solution containing iodine and potassium iodide is usually employed.
  • the content of iodine in this aqueous solution is usually 0.01 to 1 part by weight per 100 parts by weight of water, and the content of potassium iodide is usually 0.5 to 20 parts by weight per 100 parts by weight of water.
  • the temperature of the aqueous solution used for dyeing is usually 20 to 40 ° C.
  • the immersion time (dyeing time) in this aqueous solution is usually 20 to 1800 seconds.
  • a method of immersing and dyeing a polyvinyl alcohol-based resin film in an aqueous solution containing an aqueous dichroic dye is usually employed.
  • the content of the dichroic dye in this aqueous solution usually, 1 ⁇ 10 -4 ⁇ 10 parts by weight per 100 parts by weight of water, preferably 1 ⁇ 10 -3 ⁇ 1 parts by weight, particularly preferably 1 ⁇ 10 - 3 to 1 ⁇ 10 ⁇ 2 parts by weight.
  • This aqueous solution may contain an inorganic salt such as sodium sulfate as a dyeing assistant.
  • the temperature of the dye aqueous solution used for dyeing is usually 20 to 80 ° C.
  • the immersion time (dyeing time) in this aqueous solution is usually 10 to 1800 seconds. is there.
  • the boric acid treatment step is performed by immersing a polyvinyl alcohol resin film dyed with a dichroic dye in a boric acid-containing aqueous solution.
  • the amount of boric acid in the boric acid-containing aqueous solution is usually 2 to 15 parts by weight, preferably 5 to 12 parts by weight per 100 parts by weight of water.
  • the boric acid-containing aqueous solution used in this boric acid treatment process preferably contains potassium iodide.
  • the amount of potassium iodide in the boric acid-containing aqueous solution is usually 0.1 to 15 parts by weight, preferably 5 to 12 parts by weight, per 100 parts by weight of water.
  • the immersion time in the boric acid-containing aqueous solution is usually 60 to 1200 seconds, preferably 150 to 600 seconds, and more preferably 200 to 400 seconds.
  • the temperature of the boric acid-containing aqueous solution is usually 40 ° C. or higher, preferably 50 to 85 ° C., more preferably 55 to 75 ° C.
  • the polyvinyl alcohol-based resin film after the boric acid treatment described above is washed with water, for example, by immersing it in water.
  • the temperature of water in the water washing treatment is usually 4 to 40 ° C., and the immersion time is usually 1 to 120 seconds.
  • a drying treatment is usually performed to obtain a polarizing film.
  • the drying process is preferably performed using, for example, a hot air dryer or a far infrared heater.
  • the temperature for the drying treatment is usually 30 to 100 ° C., preferably 50 to 80 ° C.
  • the drying treatment time is usually 60 to 600 seconds, preferably 120 to 600 seconds.
  • the polyvinyl alcohol resin film is subjected to uniaxial stretching, dyeing with a dichroic dye, boric acid treatment and water washing treatment to obtain a polarizing film.
  • the thickness of this polarizing film is usually in the range of 5 to 50 ⁇ m.
  • transparent film 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.
  • 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 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) Etc.) can be used preferably.
  • Fujitac TD80 manufactured by Fuji Film Co., Ltd.
  • Fujitac TD80UF 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.
  • 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 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.
  • the 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, 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.
  • an adhesive made of an acrylic resin composition such as acrylamide, acrylate, urethane acrylate, or epoxy acrylate can be used.
  • 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.
  • 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 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, 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, 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.
  • the transparent films 2 and 3 that are continuously drawn out from the rolled state are respectively applied to one side by the adhesive coating devices 11 and 12.
  • An active energy ray-curable adhesive is applied.
  • 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 0.1 to 10 ⁇ m, more preferably 0. .2-4 ⁇ 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 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 the rolled state are respectively applied to one side by the adhesive coating devices 11 and 12.
  • An active energy ray-curable adhesive is applied.
  • the transparent film 2 and 3 are respectively laminated
  • a transparent film is bonded on both surfaces of the polarizing film, preferably within a range of ⁇ 1 ° so as to form an angle within a range of ⁇ 3 ° with respect to a surface perpendicular to the pressing direction of the bonding roll. It is preferable that the polarizing film is conveyed between the bonding rolls so as to overlap with a plane perpendicular to the pressing direction so as to form the angle. By doing in this way, a polarizing film and a transparent film will contact before the bonding roll, and a bubble will not generate
  • the adhesive is uniformly applied to one side of the transparent films 2, 3, and the polarizing film is applied to the surface of the transparent films 2, 3.
  • 1 shows a method of laminating 1 and laminating with laminating rolls 5a and 5b, but applying an adhesive uniformly on both sides of the polarizing film 1 and transparent film 3 on the surface of the polarizing film 1 coated with the adhesive , 2 may be overlapped and bonded by the bonding rolls 5a and 5b.
  • the rotation speed of the bonding roll is linked to the line speed.
  • the line speed is usually 10 to 100 m / min, preferably 20 m / min or more, more preferably 30 m / min or more in consideration of productivity.
  • the method of reducing the wind pressure in the region before being bonded according to the present invention is particularly effective when the line speed is high.
  • one of the pair of bonding rolls 5a and 5b has 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).
  • a roll is also acceptable.
  • the bonding roll which is not a crown roll is a flat roll whose diameter is substantially uniform.
  • 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 5a is a metal flat roll and the bonding roll 5b is a rubber crown roll
  • pressure is applied to the bearing member of the flat roll 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 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 the bonding roll is not particularly limited, but the diameter in the case of a flat roll is preferably 50 to 400 mm. In the case of a crown roll, the diameter of the end is preferably 50 to 400 mm. In addition, the diameter of each of a pair of bonding roll may be the same, and may differ.
  • the width of the bonding roll is 300 to 3000 mm.
  • the pressing pressure is not particularly limited, but when a metal roll and a rubber roll are used, the instantaneous pressure in a two-sheet type press case (for ultra-low pressure) made of Fuji Film is 0.5 to 3.0 MPa. It is preferably 0.7 to 2.3 MPa.
  • 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.
  • the material of the bonding roll includes metal and rubber. It is preferable that one of the pair of bonding rolls is a metal roll and the other is a rubber roll. Furthermore, it is more preferable that the flat roll is made of metal and the crown roll is made of rubber.
  • 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 pressed (upper) laminating roll is preferably made of metal
  • the other (lower) laminating roll 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).
  • 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, silicon, 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 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. 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.
  • 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.
  • the first active energy ray irradiation devices 14, 15 installed at positions facing the outer peripheral surface of the roll 13, and further downstream in the transport direction from this Second and subsequent active energy ray irradiators 16, 17, and 18 and a transport nip roll 19 are sequentially provided along the transport 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, and the laminate 4 is conveyed while being in close contact with the surface.
  • the adhesive is polymerized and cured by the active energy ray irradiation devices 14 and 15. .
  • 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 so that 55 ⁇ 5000mJ / cm 2.
  • 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 so that 55 ⁇ 5000mJ / cm 2.
  • the accumulated light amount to the adhesive is less than 55 mJ / cm 2 , the generation of active species derived from the initiator is not sufficient, the adhesive is not sufficiently cured, and both ends of the polarizing plate are wavy. Talmi defects may occur.
  • the integrated light quantity exceeds 5000 mJ / cm 2 , the irradiation time becomes very long, which is disadvantageous for improving productivity.
  • the integrated light amount in which wavelength region (UVA (320 to 390 nm), UVB (280 to 320 nm), etc.) is required differs depending on the combination of the film to be used and the type of adhesive.
  • the laminate is irradiated with active energy rays to polymerize and cure the adhesive, but polymerization curing by heating may be used in combination.
  • the irradiation time is 0.1 while applying a tension of 100 to 800 N / m in the longitudinal direction (transport direction) to the laminate 4. It is preferable that the laminate 4 is conveyed at a line speed that is at least 2 seconds. Moreover, it is preferable that the irradiation intensity
  • Integrated light intensity in these whole process is 55 mJ / cm 2 or more, preferably is preferably set so that 55 ⁇ 5000mJ / 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.
  • the tension for winding the laminate (polarizing plate) 4 is not particularly limited, but is preferably in the range of 30 to 150 N / cm 2 , and more preferably in the range of 30 to 120 N / cm 2 . If the tension for winding the laminate 4 is less than 30 N / cm 2, at the time of transporting the rolled long, and because there is a risk that winding deviation occurs, is greater than 150 N / cm 2 is This is because the tightness of winding is strong and there is a tendency to cause tarmi.
  • the length of the polarizing plate wound around the core is not particularly limited, but is preferably 100 to 4000 m.
  • the diameter of the cylindrical core is preferably 6 to 12 inches.
  • the diameter of the core is preferably as large as possible, and more preferably 11 inches, 12 inches, and the like.
  • 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 A polarizing film produced using a polyvinyl alcohol film “Vinylon VF-PS # 7500” (manufactured by Kuraray Co., Ltd.) and a cellulose ester resin film “KC4UYW” (manufactured by Konica Minolta Opto Co., Ltd.) via an aqueous adhesive
  • a composite film laminate having a total thickness of 135 ⁇ m was prepared, in which a surface protective film “NBO-0424” (manufactured by Fujimori Kogyo Co., Ltd.) with an adhesive layer was laminated on the KC4UYW surface.
  • a cellulose acetate-based resin film “KC4CR-1” (manufactured by Konica Minolta Opto Co., Ltd.) having a retardation property of 40 ⁇ m in thickness was prepared.
  • an epoxy resin composition (including a cationic polymerization initiator) as an ultraviolet curable adhesive “KR series” (manufactured by ADEKA, viscosity: 44 mPa ⁇ s) was applied using an adhesive coating apparatus.
  • the line speed of the polarizing film laminated body in an adhesive agent coating apparatus was 40 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 about 1.0 micrometer.
  • the laminate laminated so that the polarizing film surface of the composite film laminate is in contact with the adhesive applied to the cellulose acetate-based resin film imparted with the retardation property Both were sandwiched between a pair of nip rolls (bonding rolls) having a diameter of 250 mm, and pressed with a nip pressure of about 1.5 MPa, whereby the cellulose acetate-based resin film imparted with the retardation characteristics and the polarizing film were bonded together.
  • the suction device of FIG. 3 is installed between the cellulose acetate-based resin film and the polarizing film that have been imparted with the phase difference characteristics before being sandwiched between the pair of nip rolls, and the wind pressure in the region between the films is reduced. It was.
  • the pressure reduction amount in the apparatus at this time was 2.0 kPa.
  • the laminate on which the two types of films are bonded is transferred at a line speed of 40 m / min, and the total integrated light amount (the integrated amount of light irradiation intensity in the wavelength region of wavelengths 280 to 320 nm) is about 100 mJ / cm 2 (measuring instrument) : UVB (measured by UV Power Pack II manufactured by FusionUV).
  • Example 1 A polarizing plate was produced in the same manner as in Example 1 except that no suction equipment was installed and suction was not performed.
  • the polarizing plate of the present invention can be effectively applied to various display devices including liquid crystal display devices.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Polarising Elements (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Liquid Crystal (AREA)
  • Adhesives Or Adhesive Processes (AREA)

Abstract

L'invention concerne un procédé de fabrication d'une plaque de polarisation comportant: une étape de préparation d'un film polarisant par coloration, traitement à l'acide borique et étirement uniaxial d'un film de résine à base d'alcool polyvinylique; une étape d'application d'un agent adhésif de type durcissable sous l'effet d'un rayonnement d'énergie active sur une surface d'un film transparent; une étape de préparation d'un corps stratifié par adhésion, sur une ou les deux surfaces du film polarisant susmentionné, du film transparent susmentionné sur une surface duquel un agent adhésif a été appliqué et lequel est placé entre des rouleaux de stratification; une étape de préparation d'une plaque de polarisation par irradiation du corps stratifié susmentionné avec un rayonnement d'énergie active. Ce procédé de fabrication d'une plaque de polarisation se caractérise en ce que l'étape de préparation d'un corps stratifié susmentionnée se déroule en diminuant l'action dynamique d'une zone située entre le film polarisant avant qu'il ne soit stratifié et le film transparent.
PCT/JP2012/074487 2011-09-26 2012-09-25 Procédé de fabrication d'une plaque de polarisation WO2013047480A1 (fr)

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CN201280046921.0A CN103842860B (zh) 2011-09-26 2012-09-25 偏振板的制造方法
KR1020147010780A KR101710241B1 (ko) 2011-09-26 2012-09-25 편광판의 제조 방법

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Cited By (2)

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WO2022219838A1 (fr) * 2021-04-16 2022-10-20 日東電工株式会社 Procédé de production de stratifié optique
WO2022219839A1 (fr) * 2021-04-16 2022-10-20 日東電工株式会社 Procédé de fabrication de stratifié optique

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JP5572193B2 (ja) * 2011-09-21 2014-08-13 住友化学株式会社 偏光板の製造方法
JPWO2014010511A1 (ja) * 2012-07-12 2016-06-23 住友化学株式会社 偏光板の製造方法
CN110066103A (zh) * 2014-06-26 2019-07-30 日本电气硝子株式会社 光隔离器用偏振玻璃板组以及光隔离器用光学元件的制造方法
KR102255084B1 (ko) * 2014-07-28 2021-05-21 스미또모 가가꾸 가부시끼가이샤 롤상 아크릴계 수지 필름의 제조 방법 및 편광판의 제조 방법
CN107407761B (zh) * 2015-03-03 2021-01-05 住友化学株式会社 附带保护膜的偏振膜的制造方法
CN108603973B (zh) * 2016-02-08 2021-12-28 住友化学株式会社 层叠光学膜的制造方法

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JPH04126247A (ja) * 1990-09-18 1992-04-27 Hitachi Cable Ltd テープ状体の貼付けおよび剥離方法
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WO2022219838A1 (fr) * 2021-04-16 2022-10-20 日東電工株式会社 Procédé de production de stratifié optique
WO2022219839A1 (fr) * 2021-04-16 2022-10-20 日東電工株式会社 Procédé de fabrication de stratifié optique

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CN103842860A (zh) 2014-06-04
CN103842860B (zh) 2016-11-02
TWI575262B (zh) 2017-03-21
KR20140088525A (ko) 2014-07-10
JP2013083962A (ja) 2013-05-09
KR101710241B1 (ko) 2017-03-08
TW201319638A (zh) 2013-05-16

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