WO2020110977A1 - 偏光板のセット - Google Patents

偏光板のセット Download PDF

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Publication number
WO2020110977A1
WO2020110977A1 PCT/JP2019/045914 JP2019045914W WO2020110977A1 WO 2020110977 A1 WO2020110977 A1 WO 2020110977A1 JP 2019045914 W JP2019045914 W JP 2019045914W WO 2020110977 A1 WO2020110977 A1 WO 2020110977A1
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Prior art keywords
polarizing plate
polarizer
thickness
liquid crystal
layer
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PCT/JP2019/045914
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English (en)
French (fr)
Japanese (ja)
Inventor
真規子 新地
Original Assignee
日東電工株式会社
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Application filed by 日東電工株式会社 filed Critical 日東電工株式会社
Priority to CN201980077436.1A priority Critical patent/CN113168041A/zh
Priority to KR1020217011643A priority patent/KR20210095123A/ko
Publication of WO2020110977A1 publication Critical patent/WO2020110977A1/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
    • G02B5/3083—Birefringent or phase retarding elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/14—Protective coatings, e.g. hard coatings
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • 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
    • 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
    • G02F1/133528—Polarisers
    • 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
    • G02F1/13363—Birefringent elements, e.g. for optical compensation

Definitions

  • the present invention relates to a set of polarizing plates.
  • An image display device typically uses a display panel in which polarizing plates are arranged on both sides of a display cell.
  • the configuration of each polarizing plate differs depending on the desired characteristics. Therefore, polarizing plates having different thicknesses may be arranged on both sides of the display cell.
  • polarizing plates having different thicknesses are arranged, the contracting stress of each polarizing plate is different, so that the liquid crystal panel may warp in a high temperature and high humidity environment. As a result, problems such as light leakage and display unevenness occur in an image display device provided with these polarizing plates.
  • Patent Document 1 As a means for suppressing the warp of a liquid crystal panel in a high temperature and high humidity environment, a method of laminating a protective film having a specific tensile elastic modulus on a polarizing plate having a concave shape has been proposed (for example, Patent Document 1). ..
  • the technique relates to a thin polarizer, and there is a problem that a warp cannot be sufficiently suppressed by a polarizing plate having a constituent element having a certain thickness (for example, a retardation layer) and a large polarizing plate. is there. Therefore, even for a polarizing plate including thick components and a large polarizing plate, a set of polarizing plates capable of suppressing the warpage of the liquid crystal panel in a high temperature and high humidity environment is required.
  • the present invention has been made to solve the above problems, and its main object is to provide a set of polarizing plates capable of suppressing the warpage of a liquid crystal panel in a high temperature and high humidity environment.
  • the polarizing plate set of the present invention comprises a first polarizing plate having a thickness of 200 ⁇ m or more and 300 ⁇ m or less arranged on one surface of a liquid crystal cell, and a thickness of 150 ⁇ m or less arranged on the other surface of the liquid crystal cell. It is composed of a second polarizing plate.
  • This first polarizing plate comprises a retardation layer having a thickness of 100 ⁇ m or more, a polarizer having a thickness of 10 ⁇ m or less arranged on one surface of the retardation layer, and an adhesive agent arranged on the other surface of the retardation layer. And layers.
  • the first polarizing plate is laminated on the liquid crystal cell via the adhesive layer.
  • the first polarizing plate further has a protective layer, and the protective layer is laminated only on one surface of the polarizer.
  • the creep value of the pressure-sensitive adhesive layer is 80 ⁇ m/h or more.
  • the pressure-sensitive adhesive layer has a thickness of 10 ⁇ m to 40 ⁇ m.
  • the first polarizing plate is arranged on the back side and the second polarizing plate is arranged on the viewing side.
  • a liquid crystal panel is provided. This liquid crystal panel includes the above-mentioned set of polarizing plates and a liquid crystal cell. In one embodiment, the distance between the liquid crystal cell and the polarizer of the first polarizing plate is 120 ⁇ m to 190 ⁇ m.
  • the polarizing plate set of the present invention comprises a first polarizing plate having a thickness of 200 ⁇ m or more and 300 ⁇ m or less arranged on one surface of a liquid crystal cell, and a thickness of 150 ⁇ m or less arranged on the other surface of the liquid crystal cell. And a second polarizing plate.
  • the first polarizing plate comprises a retardation layer having a thickness of 100 ⁇ m or more, a polarizer having a thickness of 10 ⁇ m or less arranged on one surface of the retardation layer, and a pressure-sensitive adhesive arranged on the other surface of the retardation layer.
  • a layer, and the first polarizing plate is laminated on the liquid crystal cell via the pressure-sensitive adhesive layer.
  • the retardation layer included in the first polarizing plate used in the present invention has a thickness of 100 ⁇ m or more. Therefore, even if a slight warp occurs in the liquid crystal panel under a high temperature and high humidity environment, the influence of the warp on the optical characteristics of the retardation layer can be suppressed. As a result, the desired optical characteristics of the retardation layer are maintained well, and it is possible to prevent the display characteristics of the liquid crystal display device from deteriorating even when placed in a high temperature and high humidity environment.
  • FIG. 1 is a schematic cross-sectional view of a liquid crystal panel including a set of polarizing plates according to an embodiment of the present invention.
  • Refractive index (nx, ny, nz) “Nx” is the refractive index in the direction in which the in-plane refractive index is maximum (that is, the slow axis direction), and “ny” is the direction in the plane that is orthogonal to the slow axis (that is, the fast axis direction).
  • nz is the refractive index in the thickness direction.
  • the “refractive index” of a film that causes birefringence after stretching refers to a value calculated by (nx+ny+nz)/3, unless otherwise specified.
  • Re(550) is the in-plane retardation of the film measured with light having a wavelength of 550 nm at 23° C.
  • Re(450) is the in-plane retardation of the film measured with light having a wavelength of 450 nm at 23° C.
  • Phase difference (Rth) in the thickness direction “Rth(550)” is the retardation in the thickness direction of the film measured with light having a wavelength of 550 nm at 23° C.
  • Rth(450) is a retardation in the thickness direction of the film measured with light having a wavelength of 450 nm at 23°C.
  • FIG. 1 is a schematic cross-sectional view of a liquid crystal panel including a polarizing plate set according to an embodiment of the present invention.
  • a first polarizing plate 21 and a second polarizing plate 22 are laminated on both sides of the liquid crystal cell 10.
  • the thickness of the first polarizing plate is 200 ⁇ m or more and 300 ⁇ m or less, and the thickness of the second polarizing plate is 150 ⁇ m or less.
  • the first polarizing plate 21 includes a retardation layer 32 having a thickness of 100 ⁇ m or more, a polarizer 31 having a thickness of 10 ⁇ m or less arranged on one surface of the retardation layer 32, and a retardation layer of the retardation layer 32. It has a pressure-sensitive adhesive layer 33 arranged on the other surface, and a protective layer 34 if necessary.
  • the first polarizing plate 21 is laminated on the liquid crystal cell 10 via the adhesive layer 33.
  • the second polarizing plate 22 has a polarizer 35, a protective layer 37 arranged on one surface of the polarizer 35, and an adhesive layer 36 arranged on the other surface of the polarizer 35. ..
  • the second polarizing plate 22 is laminated on the liquid crystal cell 10 via the adhesive layer 36.
  • the polarizer 31 and the protective layer 34, and the polarizer 35 and the protective layer 37 may be laminated via any appropriate adhesive layer (not shown).
  • the first polarizing plate 21 and the second polarizing plate 22 may further include any appropriate other layer (not shown).
  • Other layers include surface treatment layers and other protective layers.
  • the first polarizing plate is arranged on the back side and the second polarizing plate is arranged on the viewing side.
  • the first polarizing plate 21 has a thickness of 200 ⁇ m or more and 300 ⁇ m or less.
  • the retardation layer 32 of the first polarizing plate 21 has a thickness of 100 ⁇ m or more.
  • the thickness of the polarizer 31 of the first polarizing plate 21 (hereinafter, also referred to as the first polarizer) is 10 ⁇ m or less.
  • the first polarizing plate 21 preferably further has a protective layer 34. In this embodiment, it is preferable that the polarizer 31 of the first polarizing plate 21 has a protective layer on only one surface.
  • the thickness of the first polarizing plate 21 (more specifically, the distance from the first polarizer to the liquid crystal cell) from becoming too thick, and to prevent the thickness from increasing in a high temperature and high humidity environment.
  • the warp of the liquid crystal panel can be suppressed.
  • the distance between the polarizer 31 of the first polarizing plate and the liquid crystal cell 10 is preferably 120 ⁇ m to 190 ⁇ m, more preferably 140 ⁇ m to 190 ⁇ m, and further preferably 160 ⁇ m to 190 ⁇ m.
  • the distance between the polarizer 31 and the liquid crystal cell 10 refers to the distance from the center of the polarizer (half the thickness of the polarizer) to the portion in contact with the liquid crystal cell. Specifically, in FIG. 1, it means a value obtained by summing the value of 1/2 of the thickness of the polarizer 31, the thickness of the retardation layer 32, and the thickness of the pressure-sensitive adhesive layer 33.
  • the second polarizing plate 22 has a thickness of 150 ⁇ m or less.
  • the second polarizing plate 22 may have a thickness of 150 ⁇ m or less, and may include any appropriate layer.
  • the second polarizing plate 22 includes, for example, a polarizer 35, an adhesive layer 36 arranged on one surface of the polarizer 35, and a protective layer 37 arranged on the other surface of the polarizer 35. Including. In this embodiment, the total thickness of the polarizer 35, the pressure-sensitive adhesive layer 36, and the protective layer 37 may be 150 ⁇ m or less.
  • the distance between the polarizer 35 of the second polarizing plate and the liquid crystal cell 10 is preferably 50 ⁇ m to 90 ⁇ m, more preferably 50 ⁇ m to 70 ⁇ m, and further preferably 55 ⁇ m to 65 ⁇ m. If the distance between the polarizer 35 of the second polarizing plate and the liquid crystal cell 10 is in the above range, warpage of the liquid crystal panel under a high temperature and high humidity environment can be further suppressed.
  • the first polarizing plate 21 has a thickness of 200 ⁇ m or more and 300 ⁇ m or less, preferably 200 ⁇ m to 280 ⁇ m, and more preferably 220 ⁇ m to 250 ⁇ m.
  • the first polarizing plate 21 includes a retardation layer 32 having a thickness of 100 ⁇ m or more, a polarizer 31 having a thickness of 10 ⁇ m or less arranged on one surface of the retardation layer 32, and the other surface of the retardation layer 32. It has the adhesive layer 33 arrange
  • the first polarizing plate 21 is attached to the liquid crystal cell via the adhesive layer 33. As described above, the thickness of the first polarizing plate is thicker than that of the second polarizing plate.
  • the distance from the center of the polarizer of the first polarizing plate to the liquid crystal cell (specifically, half the thickness of the polarizer, the thickness of the retardation layer, and the pressure-sensitive adhesive layer). The sum of the thickness and the thickness of) does not become too thick. With such a configuration, warpage of the liquid crystal panel under a high temperature and high humidity environment can be suppressed.
  • the first polarizing plate 21 preferably further has a protective layer 34.
  • a protective layer By having a protective layer, a polarizer can be protected appropriately.
  • the protective layer 34 is preferably laminated only on one surface of the polarizer. Since the protective layer is laminated on one surface of the polarizer, more preferably on the surface of the polarizer 31 on which the retardation layer 32 is not laminated, the polarizer can be formed without increasing the thickness of the first polarizing plate. Can be properly protected.
  • a separator may be further laminated on the pressure-sensitive adhesive layer 33 until it is used for manufacturing a liquid crystal panel.
  • each component of the first polarizing plate will be described.
  • the polarizer 31 has a thickness of 10 ⁇ m or less, preferably 3 ⁇ m to 10 ⁇ m, and more preferably 3 ⁇ m to 8 ⁇ m. By using a thin polarizer, the thickness of the first polarizing plate 21 can be prevented from becoming too thick, and the distance from the polarizer to the liquid crystal cell can be shortened.
  • the polarizer 31 is typically composed of a resin film containing a dichroic material.
  • the resin film any suitable resin film that can be used as a polarizer can be adopted.
  • the resin film is typically a polyvinyl alcohol-based resin (hereinafter referred to as “PVA-based resin”) film.
  • Any suitable resin may be used as the PVA-based resin forming the PVA-based resin film.
  • suitable resin include polyvinyl alcohol and ethylene-vinyl alcohol copolymer.
  • Polyvinyl alcohol is obtained by saponifying polyvinyl acetate.
  • the ethylene-vinyl alcohol copolymer can be obtained by saponifying an ethylene-vinyl acetate copolymer.
  • the degree of saponification of the PVA-based resin is usually 85 mol% to 100 mol%, preferably 95.0 mol% to 99.95 mol%, and more preferably 99.0 mol% to 99.93 mol%. ..
  • the degree of saponification can be determined according to JIS K 6726-1994. By using a PVA-based resin having such a saponification degree, a polarizer having excellent durability can be obtained. If the degree of saponification is too high, gelation may occur.
  • the average degree of polymerization of the PVA resin can be appropriately selected according to the purpose.
  • the average degree of polymerization is usually 1000 to 10000, preferably 1200 to 4500, and more preferably 1500 to 4300.
  • the average degree of polymerization can be determined according to JIS K 6726-1994.
  • dichroic substances contained in the resin film include iodine and organic dyes. These may be used alone or in combination of two or more. Preferably, iodine is used.
  • the resin film may be a single-layer resin film or a laminate of two or more layers.
  • a specific example of a polarizer composed of a single-layer resin film is a PVA-based resin film that has been subjected to dyeing treatment with iodine and stretching treatment (typically, uniaxial stretching).
  • the dyeing with iodine is performed, for example, by immersing the PVA-based resin film in an iodine aqueous solution.
  • the stretching ratio of the uniaxial stretching is preferably 3 to 7 times. Stretching may be performed after the dyeing treatment or may be performed while dyeing. Further, it may be stretched and then dyed. If necessary, the PVA resin film is subjected to swelling treatment, crosslinking treatment, washing treatment, drying treatment and the like.
  • the polarizer obtained using the laminate include a laminate of a resin base material and a PVA-based resin layer (PVA-based resin film) laminated on the resin base material, or a resin base material and the resin.
  • a polarizer obtained by using a laminate with a PVA-based resin layer formed by coating on a base material examples include a polarizer obtained by using a laminate with a PVA-based resin layer formed by coating on a base material.
  • a polarizer obtained by using a laminate of a resin base material and a PVA-based resin layer formed by coating on the resin base material is, for example, a resin base material obtained by applying a PVA-based resin solution to the resin base material and drying the solution.
  • a PVA-based resin layer is formed thereon to obtain a laminate of a resin base material and a PVA-based resin layer; the laminate is stretched and dyed to form the PVA-based resin layer as a polarizer; obtain.
  • the stretching typically includes dipping the laminate in a boric acid aqueous solution and stretching. Further, the stretching may further include optionally stretching the laminate in air at a high temperature (for example, 95° C. or higher) before stretching in the aqueous boric acid solution.
  • the resin base material/polarizer laminate thus obtained may be used as it is (that is, the resin base material may be used as a protective layer of the polarizer), or the resin base material is peeled from the resin base material/polarizer laminate.
  • any appropriate protective layer may be laminated and used on the peeled surface depending on the purpose. Details of the method for manufacturing such a polarizer are described in, for example, Japanese Patent Application Laid-Open No. 2012-73580. The entire description of the publication is incorporated herein by reference.
  • the polarizer preferably exhibits absorption dichroism at any wavelength of 380 nm to 780 nm.
  • the single transmittance of the polarizer is preferably 43.0% to 46.0%, more preferably 44.5% to 46.0%.
  • the polarization degree of the polarizer is preferably 97.0% or more, more preferably 99.0% or more, and further preferably 99.9% or more.
  • the retardation layer 32 has a thickness of 100 ⁇ m or more, preferably 100 ⁇ m to 200 ⁇ m, more preferably 100 ⁇ m to 150 ⁇ m, and further preferably 110 ⁇ m to 150 ⁇ m.
  • the thickness of the retardation layer is less than 100 ⁇ m, the retardation layer may warp when the liquid crystal panel warps in a high temperature and high humidity environment. Therefore, desired optical characteristics of the retardation layer may be impaired.
  • the thickness of the retardation layer is in the above range, desired optical characteristics of the retardation layer can be favorably maintained even when the liquid crystal panel is slightly warped in a high temperature and high humidity environment.
  • the retardation layer 32 may be any retardation layer having a thickness within the above range, and any appropriate retardation layer can be used.
  • the retardation layer has an index ellipsoid of nx>nz>ny.
  • the Nz coefficient of the retardation layer is preferably 0.1 to 0.9, more preferably 0.3 to 0.7, and further preferably 0.4 to 0.6.
  • the retardation layer may be formed of any appropriate material as long as the above characteristics can be obtained.
  • a typical example is a stretched film of a polymer film.
  • the resin forming the polymer film is preferably a norbornene resin or a polycarbonate resin.
  • the details of the resin forming the polymer film are described in, for example, JP-A-2014-010291. The description is incorporated herein by reference.
  • the above norbornene-based resin is a resin that is polymerized using a norbornene-based monomer as a polymerization unit.
  • Examples of the norbornene-based monomer include norbornene and alkyl and/or alkylidene substitution products thereof, such as 5-methyl-2-norbornene, 5-dimethyl-2-norbornene, 5-ethyl-2-norbornene and 5-butyl.
  • halogen for example, 6-methyl-1,4:5,8-dimethano-1,4,4a,5,6,7,8,8a-octahydronaphthalene, 6- Ethyl-1,4:5,8-dimethano-1,4,4a,5,6,7,8,8a-octahydronaphthalene, 6-ethylidene-1,4:5,8-dimethano-1,4 4a,5,6,7,8,8a-octahydronaphthalene, 6-chloro-1,4:5,8-dimethano-1,4,4
  • Aromatic polycarbonate is preferably used as the polycarbonate resin.
  • the aromatic polycarbonate can be typically obtained by reacting a carbonate precursor with an aromatic dihydric phenol compound.
  • Specific examples of the carbonate precursor include phosgene, bischloroformate of dihydric phenols, diphenyl carbonate, di-p-tolyl carbonate, phenyl-p-tolyl carbonate, di-p-chlorophenyl carbonate, dinaphthyl carbonate and the like. Can be mentioned. Among these, phosgene and diphenyl carbonate are preferable.
  • aromatic dihydric phenol compound examples include 2,2-bis(4-hydroxyphenyl)propane, 2,2-bis(4-hydroxy-3,5-dimethylphenyl)propane and bis(4-hydroxyphenyl).
  • the polymer film may include any other suitable thermoplastic resin.
  • suitable thermoplastic resins include polyolefin resin, polyvinyl chloride resin, cellulose resin, styrene resin, acrylonitrile/butadiene/styrene resin, acrylonitrile/styrene resin, polymethylmethacrylate, polyvinyl acetate, polyvinyl chloride.
  • General-purpose plastics such as vinylidene-based resins; general-purpose engineering plastics such as polyamide-based resins, polyacetal-based resins, polycarbonate-based resins, modified polyphenylene ether-based resins, polybutylene terephthalate-based resins, polyethylene terephthalate-based resins; polyphenylene sulfide-based resins, polysulfone-based resins
  • Examples include super engineering plastics such as polyether sulfone resin, polyether ether ketone resin, polyarylate resin, liquid crystalline resin, polyamideimide resin, polyimide resin, and polytetrafluoroethylene resin.
  • Any appropriate method can be adopted as a method for producing the stretched film.
  • a typical example is a method in which a shrinkable film is attached to one side or both sides of the above polymer film and the film is heated and stretched.
  • the shrinkable film is used for applying a shrinkage force in a direction orthogonal to the stretching direction during heating and stretching.
  • the material used for the shrinkable film include polyester, polystyrene, polyethylene, polypropylene, polyvinyl chloride, polyvinylidene chloride and the like.
  • a polypropylene film is preferably used because of its excellent shrinkage uniformity and heat resistance.
  • any suitable stretching method may be adopted as long as it can impart a tension in the stretching direction of the polymer film and a contracting force in a direction orthogonal to the stretching direction in the film plane.
  • the stretching temperature is preferably the glass transition temperature (Tg) or higher of the polymer film. This is because the retardation value of the obtained stretched film is likely to be uniform, and the film is unlikely to be crystallized (white turbidity).
  • the stretching temperature is more preferably Tg+1° C. to Tg+30° C. of the polymer film, further preferably Tg+2° C. to Tg+20° C., particularly preferably Tg+3° C. to Tg+15° C., and most preferably Tg+5° C.
  • the stretching temperature is preferably constant in the width direction of the film. This is because it is possible to produce a stretched film having good optical uniformity with a small variation in retardation value.
  • the stretching ratio at the time of stretching can be set to any appropriate value. It is preferably 1.05 times to 2.00 times, more preferably 1.10 times to 1.50 times, further preferably 1.20 times to 1.40 times, particularly preferably 1.25 times to 1.30 times. Is. By setting the stretching ratio in such a range, a stretched film having less shrinkage of the film width and excellent mechanical strength can be obtained.
  • a film obtained by stretching a polymer film containing a polycarbonate resin and a styrene resin is used. Details of such a retardation film are described in, for example, JP-A-2005-31621. The entire description of the publication is incorporated herein by reference.
  • the adhesive layer 33 is formed on the surface of the retardation layer 32 that is not in contact with the polarizer 31.
  • the creep value of the pressure-sensitive adhesive layer 33 is preferably 40 ⁇ m/h or more, more preferably 50 ⁇ m/h or more, further preferably 60 ⁇ m/h or more, and particularly preferably 80 ⁇ m/h or more.
  • the pressure-sensitive adhesive layer having a creep value within the above range has flexibility. By forming such a pressure-sensitive adhesive layer, the shrinkage stress of the polarizing plate placed in a high temperature and high humidity environment can be relaxed. Therefore, the warp of the liquid crystal panel under the high temperature and high humidity environment can be suppressed more effectively.
  • the creep value of the pressure-sensitive adhesive layer is, for example, 200 ⁇ m/h or less.
  • the creep value of the adhesive layer can be measured as follows.
  • a pressure-sensitive adhesive composition is applied to a protective layer of a polarizing plate including a protective layer and a polarizer to form a pressure-sensitive adhesive layer, to prepare a polarizing plate with a pressure-sensitive adhesive layer (test piece).
  • the produced test piece is cut into a width of 10 mm and a length of 50 mm.
  • a portion having a width of 10 mm and a length of 10 mm was attached to a stainless steel plate via an adhesive layer, and then treated in an autoclave (50° C., 5 atmospheric pressure) for 15 minutes, and then at room temperature for 1 hour. put.
  • the creep value of the pressure-sensitive adhesive layer can be measured by measuring the (deformation amount) using a laser creep tester.
  • the creep value of the adhesive layer can be adjusted by any appropriate method. For example, it can be adjusted by the molecular weight of the base polymer in the pressure-sensitive adhesive forming the pressure-sensitive adhesive layer, the addition amount of the crosslinking agent in the pressure-sensitive adhesive, and the like. More specifically, the creep value of the pressure-sensitive adhesive layer can be reduced by using a polymer having a high molecular weight as the base polymer and/or increasing the addition amount of the crosslinking agent. Further, the creep value of the pressure-sensitive adhesive layer can be increased by using a polymer having a low molecular weight as the base polymer and/or reducing the amount of the crosslinking agent added.
  • the thickness of the adhesive layer is preferably 1 ⁇ m to 50 ⁇ m, more preferably 10 ⁇ m to 40 ⁇ m. When the thickness of the pressure-sensitive adhesive layer is within the above range, the shrinkage stress of the polarizing plate can be satisfactorily relaxed.
  • any suitable adhesive can be used as the adhesive forming the adhesive layer.
  • the pressure-sensitive adhesive include acrylic pressure-sensitive adhesive, acrylic urethane pressure-sensitive adhesive, urethane pressure-sensitive adhesive, silicone pressure-sensitive adhesive, organic-inorganic hybrid pressure-sensitive adhesive and the like.
  • An acrylic pressure-sensitive adhesive is preferable from the viewpoint of transparency and durability.
  • the acrylic pressure-sensitive adhesive is, for example, an acrylic polymer using one or more kinds of (meth)acrylic acid alkyl ester as a monomer component, that is, a polymer having a structural unit derived from (meth)acrylic acid alkyl ester.
  • examples thereof include acrylic pressure-sensitive adhesives containing (homopolymer or copolymer) as a base polymer.
  • alkyl (meth)acrylate examples include methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, isopropyl (meth)acrylate, butyl (meth)acrylate, and (meth ) Isobutyl acrylate, s-butyl (meth)acrylate, t-butyl (meth)acrylate, pentyl (meth)acrylate, hexyl (meth)acrylate, heptyl (meth)acrylate, octyl (meth)acrylate , 2-ethylhexyl (meth)acrylate, isooctyl (meth)acrylate, nonyl (meth)acrylate, isononyl (meth)acrylate, decyl (meth)acrylate, isodecyl (meth)acrylate, (meth)acrylic acid Undecyl, dodecyl (meth)acryl
  • (meth)acrylic acid alkyl ester having a linear or branched alkyl group having 4 to 18 carbon atoms can be preferably used.
  • the content ratio of the structural unit derived from (meth)acrylic acid alkyl ester is preferably 60 parts by weight or more, and more preferably 80 parts by weight or more with respect to 100 parts by weight of the base polymer.
  • the acrylic polymer is derived from another monomer component copolymerizable with the (meth)acrylic acid alkyl ester, if necessary, for the purpose of modifying cohesive strength, heat resistance, cross-linking property, etc. Units may be included.
  • a monomer component include carboxyl group-containing monomers such as acrylic acid, methacrylic acid, carboxyethyl acrylate, carboxypentyl acrylate, itaconic acid, maleic acid, fumaric acid and crotonic acid; maleic anhydride, and icotanic anhydride.
  • Acid anhydride monomers such as styrene sulfonic acid, allyl sulfonic acid, 2-(meth)acrylamido-2-methylpropane sulfonic acid, (meth)acrylamide propane sulfonic acid, sulfopropyl (meth)acrylate, (meth)acryloyloxynaphthalene
  • Acid anhydride monomers such as styrene sulfonic acid, allyl sulfonic acid, 2-(meth)acrylamido-2-methylpropane sulfonic acid, (meth)acrylamide propane sulfonic acid, sulfopropyl (meth)acrylate, (meth)acryloyloxynaphthalene
  • sulfonic acid group-containing monomers such as sulfonic acid.
  • a hydroxyl group-containing monomer is used as the monomer component.
  • the hydroxyl group-containing monomer include 2-hydroxyethyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 6-hydroxyhexyl (meth)acrylate, ( Examples thereof include 8-hydroxyoctyl (meth)acrylate, 10-hydroxydecyl (meth)acrylate, 12-hydroxylauryl (meth)acrylate, and (4-hydroxymethylcyclohexyl)-methyl acrylate.
  • the content ratio of the structural unit derived from the hydroxyl group-containing monomer is preferably 0.1 part by weight to 10 parts by weight, and more preferably 0.5 part by weight to 2 parts by weight, based on 100 parts by weight of the base polymer. ..
  • crosslinking agent for example, an isocyanate crosslinking agent, an epoxy crosslinking agent, a peroxide crosslinking agent, a melamine crosslinking agent, a urea crosslinking agent, a metal alkoxide crosslinking agent, a metal chelate crosslinking agent, a metal salt crosslinking agent.
  • Agents carbodiimide type crosslinking agents, oxazoline type crosslinking agents, aziridine type crosslinking agents, amine type crosslinking agents and the like.
  • isocyanate crosslinking agents, epoxy crosslinking agents and/or peroxide crosslinking agents are preferably used.
  • the crosslinking agents may be used alone or in combination of two or more.
  • any appropriate cross-linking agent may be used as the above-mentioned isocyanate cross-linking agent.
  • the isocyanate-based cross-linking agent include isocyanate monomers such as tolylene diisocyanate, chlorophenylene diisocyanate, tetramethylene diisocyanate, xylylene diisocyanate, diphenylmethane diisocyanate and hydrogenated diphenylmethane diisocyanate; trimethylolpropane on these isocyanate monomers.
  • Isocyanate compounds and the like obtained by adding polyols such as
  • any appropriate crosslinking agent may be used as the epoxy-based crosslinking agent.
  • the epoxy-based crosslinking agent for example, an epoxy-based resin having two or more epoxy groups in the molecule is used, and specifically, diglycidylaniline, 1,3-bis(N,N-glycidylaminomethyl)cyclohexane. , N,N,N′,N′-tetraglycidyl-m-xylenediamine, 1,6-hexanediol diglycidyl ether, neopentyl glycol diglycidyl ether, ethylene glycol diglycidyl ether, propylene glycol diglycidyl ether and the like. Be done.
  • any appropriate cross-linking agent may be used as the peroxide cross-linking agent.
  • peroxide crosslinking agents include dibenzoyl peroxide, di(2-ethylhexyl)peroxydicarbonate, di(4-t-butylcyclohexyl)peroxydicarbonate, di-sec-butylperoxydicarbonate. , T-butyl peroxy neodecanoate, t-hexyl peroxypivalate, t-butyl peroxypivalate and the like.
  • the amount of the cross-linking agent added is preferably 0.01 parts by weight to 5 parts by weight, more preferably 0.02 parts by weight to 3 parts by weight, and further preferably 0, relative to 100 parts by weight of the base polymer. 0.1 to 2.5 parts by weight, particularly preferably 0.4 to 1 part by weight. Within such a range, a pressure-sensitive adhesive layer having an appropriate creep value can be formed.
  • the pressure-sensitive adhesive forming the pressure-sensitive adhesive layer may further include a silane coupling agent.
  • silane coupling agent include 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, 3-glycidoxypropylmethyldiethoxysilane, and 2-(3,4-epoxycyclohexyl).
  • Epoxy group-containing silane coupling agent such as ethyltrimethoxysilane; 3-aminopropyltrimethoxysilane, N-2-(aminoethyl)-3-aminopropylmethyldimethoxysilane, 3-triethoxysilyl-N-(1, Amino group-containing silane coupling agents such as 3-dimethylbutylidene)propylamine and N-phenyl- ⁇ -aminopropyltrimethoxysilane; (meth)acryl group-containing silane coupling agents; isocyanate group-containing silane coupling agents Can be mentioned.
  • the amount of the silane coupling agent added is preferably 0.01 part by weight to 1 part by weight, more preferably 0.05 part by weight to 0.5 part by weight, based on 100 parts by weight of the base polymer.
  • the above-mentioned pressure-sensitive adhesive may further contain any appropriate additive, if necessary.
  • the additives include tackifiers, plasticizers, pigments, dyes, fillers, antioxidants, conductive materials, ultraviolet absorbers, light stabilizers, release modifiers, softening agents, surfactants, flame retardants. Etc.
  • any suitable resin film is used.
  • the material for forming the resin film include (meth)acrylic resins, cellulose resins such as diacetyl cellulose and triacetyl cellulose, cycloolefin resins such as norbornene resins, olefin resins such as polypropylene, and polyethylene terephthalate resins. And the like, ester-based resins, polyamide-based resins, polycarbonate-based resins, copolymer resins thereof, and the like.
  • the “(meth)acrylic resin” means an acrylic resin and/or a methacrylic resin.
  • a (meth)acrylic resin having a glutarimide structure is used as the (meth)acrylic resin.
  • the (meth)acrylic resin having a glutarimide structure (hereinafter, also referred to as glutarimide resin) is disclosed in, for example, JP-A-2006-309033, JP-A-2006-317560, JP-A-2006-328329, and JP-A-2006-328329. No. 2006-328334, No. 2006-337491, No. 2006-337492, No. 2006-337493, No. 2006-337569, No. 2007-009182, No. 2009- No. 161744 and Japanese Patent Laid-Open No. 2010-284840. These descriptions are incorporated herein by reference.
  • the moisture permeability of the protective layer 34 is preferably 1.0 g/m 2 /24 hr or less, more preferably 0.8 g/m 2 /24 hr or less, and further preferably 0.6 g/m 2 /24 hr or less. Yes, and particularly preferably 0.4 g/m 2 /24 hr or less.
  • the thickness of the protective layer is typically 10 ⁇ m to 100 ⁇ m, preferably 20 ⁇ m to 40 ⁇ m.
  • the protective layer is typically laminated on the polarizer via an adhesive layer (specifically, an adhesive layer or a pressure-sensitive adhesive layer).
  • the adhesive layer is typically formed of a PVA-based adhesive or an activated energy ray-curable adhesive.
  • the pressure-sensitive adhesive layer is typically formed of an acrylic pressure-sensitive adhesive. This acrylic pressure-sensitive adhesive may be the same as or different from the pressure-sensitive adhesive forming the pressure-sensitive adhesive layer.
  • the second polarizing plate 22 has a thickness of 150 ⁇ m or less, preferably 80 ⁇ m to 140 ⁇ m, more preferably 110 ⁇ m to 130 ⁇ m.
  • the second polarizing plate 22 is a polarizing plate having a thickness smaller than that of the first polarizing plate 21.
  • the second polarizing plate may have a thickness of 150 ⁇ m or less, and includes any appropriate constituent element.
  • the second polarizing plate 22 typically has a polarizer 35, an adhesive layer 36, and a protective layer 37.
  • the second polarizing plate 22 is attached to the liquid crystal cell via the adhesive layer 36. Practically, a separator may be further laminated on the pressure-sensitive adhesive layer 36 until it is used for manufacturing a liquid crystal panel.
  • Polarizer Any appropriate polarizer can be used as the polarizer of the second polarizing plate.
  • the thin polarizer for example, having a thickness of 10 ⁇ m or less
  • a thick polarizer may be used.
  • the thickness of the polarizer is, for example, 10 ⁇ m to 35 ⁇ m, preferably 15 ⁇ m to 30 ⁇ m.
  • the pressure-sensitive adhesive layer can be formed using any appropriate pressure-sensitive adhesive.
  • the pressure-sensitive adhesive layer may be formed by using the pressure-sensitive adhesive (pressure-sensitive adhesive having a high creep value) used in the formation of the first polarizing plate, and other pressure-sensitive adhesives (for example, pressure-sensitive adhesive having a low creep value) may be used. It may be formed by using.
  • the pressure-sensitive adhesive layer of the second polarizing plate also using the pressure-sensitive adhesive used in the first polarizing plate, the shrinkage stress of the liquid crystal panel as a whole is relaxed, and the warp of the liquid crystal panel in a higher temperature and high humidity environment is prevented. Can be suppressed.
  • the protective layer can be formed of any suitable film.
  • the film used for the protective layer of the first polarizing plate can be used.
  • a liquid crystal panel of the present invention includes the above-mentioned set of polarizing plates and a liquid crystal cell.
  • the first polarizing plate is laminated on one surface of the liquid crystal cell via the pressure-sensitive adhesive layer, and the second polarizing plate is laminated on the other surface of the liquid crystal cell.
  • the first polarizing plate may be arranged on the back side and the second polarizing plate may be arranged on the viewing side.
  • any appropriate drive mode can be adopted as the drive mode of the liquid crystal cell.
  • the drive mode include STN (Super Twisted Nematic) mode, TN (Twisted Nematic) mode, IPS (In-Plane Switching) mode, VA (Vertical Aligned) (OC) (Optical Aligned Aligned), and OCB (Optically Aligned).
  • STN Super Twisted Nematic
  • TN Transmission Nematic
  • IPS In-Plane Switching
  • VA Very Aligned
  • OC Optical Aligned Aligned
  • OCB Optical Aligned Aligned
  • Aligned Nematic mode Aligned Nematic
  • ASM Addressially Symmetric Aligned Microcell
  • ECB Electro Mechanical Controlled Birefringence
  • an IPS mode liquid crystal cell is preferably used.
  • the thickness of the liquid crystal cell can be set to any appropriate value. For example, it is 0.7 mm or less, preferably 0.5 mm or less, and more preferably 0.5 mm to 0.2 mm.
  • the liquid crystal panel of the present invention can be applied to an image display device.
  • the liquid crystal panel may be arranged so that the first polarizing plate is on the back side and the second polarizing plate is on the viewing side.
  • the second polarizing plate further includes the antireflection layer
  • the antireflection layer may be disposed on the viewing side of the image display device so that the antireflection layer is on the viewing side.
  • a thick retardation layer is used in the polarizing plate set of the present invention. Therefore, it can be suitably used for a large-sized image display device.
  • the pressure-sensitive adhesive layer was formed by applying pressure-sensitive adhesives A to C to the protective layer of the polarizing plate obtained in Production Example 1 so as to have a thickness of 20 ⁇ m. A plate was made. The produced polarizing plate was cut into a piece having a width of 10 mm and a length of 50 mm to obtain a measurement sample. The end portion (width 10 mm x length 10 mm) of the cut measurement sample was attached to a stainless steel plate via an adhesive layer, and after autoclaving at 50°C for 5 minutes at 15 atm for 1 hour at room temperature.
  • the amount of displacement (deformation) of the pressure-sensitive adhesive layer was measured when a load of 500 g (tensile load) was applied to the end opposite to the end attached to the stainless steel plate at 23° C. for 1 hour, This was taken as the creep value of the pressure-sensitive adhesive layer (laser creep tester).
  • acrylic polymer solution (A1) in which the solid content concentration was adjusted to 30%.
  • an isocyanate cross-linking agent manufactured by Nippon Polyurethane Industry Co., Ltd., trade name: Coronate L, an adduct of tolylene diisocyanate of trimethylolpropane
  • Adhesive C was prepared by adding to the solution.
  • Polarizer Laminate 1 As a resin substrate, an elongated isophthalic acid-copolymerized polyethylene terephthalate (IPA copolymerized PET) film having a long shape, a water absorption of 0.75% and a Tg of 75°C ( Thickness: 100 ⁇ m) was used. One side of the base material is subjected to corona treatment, and polyvinyl alcohol (polymerization degree 4200, saponification degree 99.2 mol%) and acetoacetyl-modified PVA (polymerization degree 1200, acetoacetyl modification degree 4.6) are applied to the corona-treated surface.
  • polyvinyl alcohol polymerization degree 4200, saponification degree 99.2 mol
  • acetoacetyl-modified PVA polymerization degree 1200, acetoacetyl modification degree 4.6
  • the laminate was immersed in a cleaning bath having a liquid temperature of 30° C. (an aqueous solution obtained by mixing 4 parts by weight of potassium iodide with 100 parts by weight of water) (cleaning treatment). Then, on the surface of the PVA-based resin layer (polarizer) of the laminate, an aqueous PVA-based resin solution (manufactured by Nippon Synthetic Chemical Industry Co., Ltd., trade name “Gosefimer (registered trademark) Z-200”, resin concentration: 3% by weight) ) Is applied, and a methacrylic resin film (thickness: 25 ⁇ m, a film containing a (meth)acrylic resin having a glutarimide structure) that constitutes the protective layer is laminated and heated in an oven maintained at 60° C.
  • a cleaning bath having a liquid temperature of 30° C.
  • a polarizer laminate (a polarizing plate having a structure of protective layer/polarizer) was obtained.
  • the thickness of the polarizer was 5 ⁇ m, and the single transmittance was 42.3%.
  • Polarizer Laminate 2 A polyvinyl alcohol (average polymerization degree: 2400, saponification degree: 99.9 mol%) film having a thickness of 60 ⁇ m was immersed in warm water at 30°C for 60 seconds to be swollen. Next, it was immersed in an iodine/potassium iodide aqueous solution (weight ratio: 0.5/8, concentration: 0.3% by weight), and dyed while stretching the film up to 3.5 times. Then, it was stretched in a boric acid ester aqueous solution at 65° C. so that the total stretching ratio was 6 times. After stretching, it was dried in an oven at 40° C. for 3 minutes to obtain a polarizer.
  • iodine/potassium iodide aqueous solution weight ratio: 0.5/8, concentration: 0.3% by weight
  • a first transparent protective film (TAC film, thickness 40 ⁇ m) and a second transparent protective film (acrylic resin film, thickness: 30 ⁇ m) are attached to both sides of the above-mentioned polarizer through an adhesive layer and then polarized. It was a child laminate.
  • the thickness of the polarizer was 22 ⁇ m, and the single transmittance was 41.5%.
  • a polymer film containing a resin obtained by hydrogenating a ring-opening polymer of a norbornene-based monomer having a thickness of 130 ⁇ m (manufactured by JSR Corporation, trade name “ARTON FLZU130D0”, contracted on both sides.
  • Film (C) (manufactured by Toray Industries, Inc., product name: Trefan) was attached via an acrylic pressure-sensitive adhesive layer (thickness: 15 ⁇ m), and then held in the longitudinal direction of the film by a roll stretching machine. The film was stretched 1.42 times in an air-circulating constant-temperature oven at 146° C. ⁇ 1° C.
  • a shrinkable film Longitudinal uniaxially stretched polypropylene film, manufactured by Tokyo Ink Co., Ltd., trade name “Nobren”
  • Example 1 An acrylic pressure-sensitive adhesive was applied to the polarizer of the polarizer laminate obtained in Production Example 1 so as to have a thickness of 20 ⁇ m, and the retardation layer 1 was laminated. Next, the pressure-sensitive adhesive B was applied to the surface of the laminated retardation layer 1 which was not in contact with the polarizer so as to have a thickness of 20 ⁇ m to form a pressure-sensitive adhesive layer, and a first polarizing plate was obtained. Separately, a pressure-sensitive adhesive A was applied to the polarizer of the polarizer laminate obtained in Production Example 1 so as to have a thickness of 23 ⁇ m to form a pressure-sensitive adhesive layer, and a second polarizing plate was obtained. Each evaluation was performed using the obtained set of the first polarizing plate and the second polarizing plate.
  • Example 2 A first polarizing plate was obtained in the same manner as in Example 1 except that the pressure-sensitive adhesive A was used instead of the pressure-sensitive adhesive B to form the pressure-sensitive adhesive layer (thickness: 23 ⁇ m).
  • the pressure-sensitive adhesive A was applied to the polarizer of the polarizer laminate obtained in Production Example 2 to have a thickness of 20 ⁇ m to form a pressure-sensitive adhesive layer, and a second polarizing plate was obtained. Each evaluation was performed using the obtained set of the first polarizing plate and the second polarizing plate.
  • Example 3 A second polarizing plate was obtained in the same manner as in Example 2 except that the pressure sensitive adhesive layer of the second polarizing plate was changed to the pressure sensitive adhesive A to form the pressure sensitive adhesive B.
  • a polarizing plate set was obtained in the same manner as in Example 2 except that the obtained second polarizing plate was used. Each evaluation was performed using this set.
  • Example 4 A second polarizing plate was obtained in the same manner as in Example 2 except that the pressure sensitive adhesive layer of the second polarizing plate was replaced with the pressure sensitive adhesive layer A and the pressure sensitive adhesive C was used. A polarizing plate set was obtained in the same manner as in Example 2 except that the obtained second polarizing plate was used. Each evaluation was performed using this set.
  • Example 1 A polarizing plate set was obtained in the same manner as in Example 1 except that the retardation layer 2 was used instead of the retardation layer 1. Each evaluation was performed using this set.
  • Example 2 A first polarizing plate was obtained in the same manner as in Example 1 except that the polarizer laminate obtained in Production Example 2 was used. A second polarizing plate was obtained in the same manner as in Example 1 except that the polarizer laminate obtained in Production Example 2 was used. Each evaluation was performed using the obtained set of the first polarizing plate and the second polarizing plate.
  • the focal lengths of the four corners of the second polarizing plate (viewing side polarizing plate) of the obtained laminate were measured using a flat biaxial measuring device (manufactured by Mitutoyo Corporation, product name: Quick Vision Apex).
  • the laminate was placed under reliability test conditions (85° C.) for 24 hours, and the focal lengths at the four corners of the second polarizing plate side (viewing side polarizing plate) were measured in the same manner.
  • the difference between the focal lengths before and after the reliability test was applied to each corner was calculated, and the average value of the four corners was used as the amount of warpage of each polarizing plate set.
  • the amount of each warp was evaluated according to the following criteria.
  • the polarizing plate set of the present invention is suitably used for a liquid crystal display device.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Polarising Elements (AREA)
  • Liquid Crystal (AREA)
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KR20160135198A (ko) * 2014-03-18 2016-11-25 소켄 케미칼 앤드 엔지니어링 캄파니, 리미티드 편광판용 점착제 조성물, 점착 시트 및 점착제층 부착 편광판
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JP2003307621A (ja) * 2002-04-18 2003-10-31 Nitto Denko Corp 粘着型光学フィルムおよび画像表示装置
JP2006309130A (ja) * 2004-12-02 2006-11-09 Nitto Denko Corp 光学補償層付偏光板およびそれを用いた画像表示装置
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