WO1993002381A1 - Film polariseur pour afficheur a cristaux liquides - Google Patents

Film polariseur pour afficheur a cristaux liquides Download PDF

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Publication number
WO1993002381A1
WO1993002381A1 PCT/JP1992/000927 JP9200927W WO9302381A1 WO 1993002381 A1 WO1993002381 A1 WO 1993002381A1 JP 9200927 W JP9200927 W JP 9200927W WO 9302381 A1 WO9302381 A1 WO 9302381A1
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WO
WIPO (PCT)
Prior art keywords
polarizing film
liquid crystal
crystal display
film
thermoplastic saturated
Prior art date
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PCT/JP1992/000927
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English (en)
Japanese (ja)
Inventor
Nobukazu Takahashi
Tsutomu Hani
Tadao Natsuume
Rinjiro Ichikawa
Kenji Hashimoto
Original Assignee
Nippon Zeon Co., Ltd.
Fujimori Kogyo Co., Ltd.
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Application filed by Nippon Zeon Co., Ltd., Fujimori Kogyo Co., Ltd. filed Critical Nippon Zeon Co., Ltd.
Publication of WO1993002381A1 publication Critical patent/WO1993002381A1/fr

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Classifications

    • 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

Definitions

  • the present invention relates to a polarizing film for a liquid crystal display, and more particularly to a polarizing film for a liquid crystal display having a protective layer formed of a thermoplastic saturated norbornene-based resin sheet.
  • a liquid crystal display is generally composed of a liquid crystal cell, a polarizer, a reflector or a backlight.
  • the liquid crystal cell is composed of two liquid crystal substrates, a spacer, a liquid crystal material, etc., provided with transparent electrodes on the inward surface of a transparent glass or plastic substrate, and the liquid crystal material is sealed between the two liquid crystal substrates. It is a structure that was given.
  • Polarizers are arranged on both sides of a liquid crystal cell in the case of a normal TN type liquid crystal.
  • polarizer a thin-film type polarizer (polarizing film) is used, and a protective layer made of various films is laminated on both sides with an adhesive to secure durability and mechanical strength.
  • This laminate is called a polarizing film or a polarizing plate.
  • the polarizing film is attached to the liquid crystal substrate via a transparent acrylic adhesive or the like in order to prevent light reflection loss at the interface with the liquid crystal cell. Therefore, in ordinary polarizing films, an adhesive layer is provided on one side of the protective layer, and a release film (separator) is formed on the adhesive layer from the viewpoint of protection of the adhesive layer and workability. Is provided. When bonding the polarizing film to the liquid crystal substrate, the release film is peeled off.
  • the polarizing film splits the incident light into two orthogonal polarization components
  • -Has the function of absorbing or dispersing other components.
  • the absorption axes of two polarizing films are orthogonal
  • the transmission or non-transmission of light is switched according to the presence or absence of an applied voltage, and the pattern is determined by the density ratio of the transmitted light between the orthogonal position and the parallel position. Is displayed. Therefore, the higher the polarization degree and the higher the transmittance, the better the performance.
  • a polarizing film in which a transparent polymer film is arranged in a certain direction and a dichroic substance is adsorbed in the gaps of micelles.
  • Typical examples of such a polarizing film include polyvinyl alcohol (hereinafter abbreviated as PVC), iodine-based, dye-based, PVA-, polyvinylene-based, and other PVC-based polarizing films, and polyene-based polarizing films.
  • the protective layer has no birefringence, high transmittance, good heat resistance and moisture absorption resistance, high mechanical strength, low shrinkage due to changes in temperature and humidity, and a smooth surface. , High resolution, good adhesion with the adhesive, and excellent appearance are required.
  • a solution cast film of cellulose triacetate hereinafter abbreviated as TAC
  • the water vapor transmission rate of the PVC film constituting the polarizing substrate is 25 at a thickness of 25 im. C, in an environment of 90% RH, 100 000 ⁇ : L 200 g / m 2 ⁇ 24 hr, whereas the TAC film of the protective layer is 700 000 under the same conditions. It has a water vapor permeability of about g / m 2 ⁇ 24 hr, and has insufficient moisture resistance. Therefore, a polarizing film using a TAC film as a protective layer has poor durability at high temperature and high humidity.For example, it deteriorates in 100 hours or less in an environment of 80% and 90% RH, and the polarizing performance is deteriorated. It drops sharply.
  • TAC films also have insufficient gas barrier properties, and dichroic substances such as iodine and dyes are liable to be degraded by oxygen that has permeated. Further, since a TAC film contains a plasticizer for forming a film, the TAC film has insufficient heat resistance. Furthermore, the TAC film has a tensile strength of only about 6 to 11 kg / mm 2 and lacks physical strength. Therefore, a TAC film having a thickness of 80 / m is generally used because its strength and durability are low at a thin film of 40 / m or less.
  • TAC film has a large photoelastic coefficient, so that birefringence tends to increase when external force is applied or when there is residual stress during molding. As a result, TAC films could only be produced by the solution casting method, which provides films with low birefringence and good appearance and low residual stress.
  • the polarizing film is laminated on a liquid crystal substrate, phase plate, etc. via an adhesive layer, but there is a problem in the adhesion between the TAC film and the adhesive. A bubble of air called a tunnel is likely to be generated. Further, when an adhesive layer containing acrylic acid is laminated on the TAC film, there is also a problem that the TAC film is decomposed by acrylic acid. Disclosure of the invention
  • An object of the present invention is to provide a polarizing film for a liquid crystal display having excellent water resistance, moisture resistance, physical strength, heat resistance, transparency, low birefringence, etc., excellent adhesiveness with an adhesive, and excellent durability against the adhesive.
  • the present inventors have conducted intensive studies to overcome the problems of the prior art, and as a result, a polarizing film obtained by laminating a thermoplastic saturated norbornene-based resin sheet on at least one side of the polarizing film as a protective layer, The inventors have found that they have excellent properties as a polarizing film for liquid crystal displays, and have completed the present invention based on the findings.
  • thermoplastically saturated norbornene-based resin sheet is laminated as a protective layer on at least one side of the polarizing film.
  • a polarizing film for a liquid crystal display is provided.
  • the polarizing film used in the present invention is not particularly limited as long as it has a function as a polarizer.
  • Examples thereof include a formed polyene-based polarizing film, a polarizing film having a dichroic dye on the surface and Z or inside of a PVA-based film made of a modified PVA containing a cationic group in a molecule.
  • the method for manufacturing the polarizing film is not particularly limited.
  • a method of stretching a PVA-based film and then adsorbing iodine ions a method of stretching a PVA-based film after dyeing with a dichroic dye, a method of stretching a PVA-based film and dyeing it with a dichroic dye, a method of dichroic dye
  • a known method such as a method of printing a polymer on a PVA-based film and then stretching, and a method of stretching a PVA-based film and printing a dichroic dye.
  • iodine is dissolved in a potassium iodide solution to form higher-order iodine ions, and this ion is adsorbed on a PVA film and stretched, and then is added to a 1 to 4% aqueous boric acid solution.
  • method for producing a polarizing film was immersed in a bath temperature 3 0 to 4 0 e C, there have is stretched degrees about 3-7 times in the uniaxial direction by likewise borated PVA film, 0.0 5
  • a method of manufacturing a polarizing film by immersing the dye in a 5% aqueous solution of dichroic dye at a bath temperature of 30 to 40 ° C. to adsorb the dye, drying at 80 to 100 °, and heat-setting to form a polarizing film. is there.
  • thermoplastic saturated norbornene-based resin used in the present invention is known in JP-A-31-48882, JP-A-3-122213, JP-A-4-6387, and the like.
  • examples thereof include a hydrogenated product thereof, an addition polymer of a norbornene monomer, and an addition polymer of a norbornene monomer and olefin.
  • Norbornene-based monomers are also known in the above-mentioned publications such as Japanese Patent Application Laid-Open No. 2-227424 and Japanese Patent Application Laid-Open No. 2-276842, and examples thereof include norbornene dicyclopentadiene and dimethanooctane.
  • a substituent of a polar group such as a silyl group.
  • norbornene More specifically, norbornene, 5-methyl-2-norbornene, 5-dimethyl-2-norbornene, 5-ethyl-2-norbornene, 5-butyl-2-norbornene, 5-ethylidene-2-norbornene, etc.
  • Polar group substituents dicyclopentadiene, 2,3-dihydroxycyclopentadiene, etc .; dimethanooctahydrodonaphthalene, its alkyl and Z or alkylidene substituents, and polar group substituents such as halogens, for example, 6-methyl- 1,4: 5,8—Dimethano 1,4,4a, 5,6,7,8,8a—Aged Kuta hydronaphthalene, 6—Ethyru 1,4: 5,8—Dimethano 1,4,4a, 5,6,7,8,8a—octahydronaphthalene, 6—ethylidene-1,4: 5,8—dimethanone 1,4,4a, 5,6 , 7,8,8a—Kuta Hydronaphta 1, 4-: 5,8-dimethano-1,4: 4a, 5,6,7,7,8,8a—Kuta hydronaphthalene, 6—Cyanore 1,4: 5 , 8
  • thermoplastic saturated norbornene resin used in the present invention generally has a number average molecular weight of 25,000 to 100: 000, as measured by gel permeation chromatography (GPC) using a toluene solvent. It is preferably in the range of 30,000 to 800,000, more preferably in the range of 3,500 to 700,000.
  • the hydrogenation rate is usually 90% or more from the viewpoint of heat deterioration resistance and light deterioration resistance. It is preferably at least 95%, more preferably at least 99%.
  • Thermoplastic saturated norbornene resins have excellent transparency, heat resistance, moisture resistance, physical strength, adhesion to adhesives, and durability to adhesives.
  • thermoplastic saturated norbornene-based resin used in the present invention may optionally contain various additives such as an antioxidant such as a fuanol-based or phosphorus-based antioxidant, an antistatic agent, and an ultraviolet absorber.
  • an antioxidant such as a fuanol-based or phosphorus-based antioxidant
  • an antistatic agent such as a fuanol-based or phosphorus-based antioxidant
  • an ultraviolet absorber such as a fuanol-based or phosphorus-based antioxidant
  • liquid crystals are usually degraded by ultraviolet rays, so it is preferable to add an ultraviolet absorber if no other protective means such as laminating an ultraviolet protective filter is taken.
  • a benzophenone-based ultraviolet absorber a benzotriazole-based ultraviolet absorber, an attarylnitrile-based ultraviolet absorber, and the like can be used, and among them, a benzofuyunone-based ultraviolet absorber is preferable.
  • the amount is usually 100 to 100,000 ppm, preferably 100 to 100, OOO ppm.
  • a leveling agent is preferably added to reduce the surface roughness.
  • the reppelling agent for example, a replating agent for paints such as a fluorine-based nonionic surfactant, a special acrylic resin-based reppelling agent, and a silicone-based reppelling agent can be used. It is preferable to use those having good compatibility with the above, and the amount of addition is usually 5 to 50,000 ppm, preferably 10 to 20, ppm ppm.
  • the protective layer used in the present invention is a sheet of a thermoplastic saturated norbornene-based resin.
  • the sheet of the thermoplastic saturated norbornene resin as the protective layer is preferably prepared by a solution casting method.However, since the resin has a small photoelastic coefficient, unlike the case of the TAC, the sheet is formed by a melt molding method. Even if a sheet is manufactured, a sheet with sufficiently low birefringence can be obtained.
  • thermoplastic saturated norbornene resin in a solution, the resin is dissolved in a solvent.
  • the solvent used preferably has a boiling point of at least 10 ° C., more preferably 120. More than C is more preferable.
  • a solvent capable of uniformly dissolving the thermoplastic saturated norbornene-based resin is preferable even when the solid content concentration is 10% by weight or more in 25.
  • Examples of such a solvent include toluene, xylene, ethylbenzene, benzene benzene, trimethylbenzene, ethynolbenzen, isopropylbenzene, benzene benzene and the like.
  • xylene, ethylbenzene, chlorobenzene and the like are exemplified. Mouth benzene is preferred.
  • these solvents may contain cyclic ethers such as cyclohexane, chloroform, benzene, tetrahydrofuran dioxane, or n-hexane or n-butyl ether.
  • cyclic ethers such as cyclohexane, chloroform, benzene, tetrahydrofuran dioxane, or n-hexane or n-butyl ether.
  • a linear hydrocarbon such as butane may be contained.
  • Those satisfying these conditions favorably include those containing 50% or more of an aromatic solvent such as xylene or ethylbenzene having a boiling point of 100 ° C. or more.
  • an aromatic solvent such as xylene or ethylbenzene having a boiling point of 100 ° C. or more.
  • the resin concentration in the solution used for casting is usually 5 to 60% by weight, preferably 10 to 50% by weight, more preferably 20 to 45% by weight. If the concentration of the resin is too low, it is difficult to adjust the thickness of the sheet because the viscosity is low, and if the concentration is too high, the film forming property is poor because the viscosity is high, and a film with good appearance cannot be obtained. .
  • the method for casting the resin solution is not particularly limited, and a general solution casting method can be used. Concretely, the resin solution is coated with a bar coater, T die, T die with bar, doctor knife, Meyer's bar, roll coat, die coat, etc., using a heat-resistant material such as polyethylene terephthalate, steel. A method of casting on a flat plate such as a belt or a metal foil or a roll can be used.
  • Sheets prepared by the solution casting method shall be dried to a residual solvent concentration of 2% by weight or less. If the residual solvent concentration is too high, the heat resistance is poor, and When used in a high-temperature environment, the remaining solvent evaporates, adversely affecting the surroundings and causing deformation.
  • the residual solvent concentration is preferably 10% by weight or less in a temperature range of 30 to 100 ° C., preferably 40 to 80 ° C. Is dried to less than 5% by weight. In this case, if the drying temperature is too high, the sheet foams as the solvent evaporates.
  • the sheet is peeled off from the flat plate or roll, and as a second stage of drying, the temperature is raised from room temperature to 60 or more, preferably 70 to a temperature range from the glass transition temperature (T g) of the resin, Dry until the residual solvent concentration is less than 2% by weight, preferably less than 1% by weight, more preferably less than 0.5% by weight.
  • T g glass transition temperature
  • the drying temperature is too low, drying will not proceed, and if the temperature is too high, foaming will occur.
  • the sheet is peeled off from the flat plate or roll after drying is completed, and the second stage of drying is performed, or after the first stage of drying, the sheet is cooled and the sheet is flat or rolled. And a second drying step.
  • melt extrusion method such as a method using a T-die and an extrusion method, a calendar method, a hot press method, and an injection molding method.
  • a melt extrusion method using a T-die which has a small thickness unevenness, is easily processed to a thickness of about 10 to 500 m, and can reduce the absolute value of the retardation and its variation, is possible. I like it.
  • the conditions of the melt molding method are the same as the general conditions used for optical materials having the same glass transition temperature (T g).
  • T g glass transition temperature
  • the resin sheet is set at a resin temperature of about 240 to 300, and the temperature of the take-up roll is set at a relatively high temperature of about 100 to 150 ° C. It is preferable to select conditions that allow for slow cooling.
  • die In order to reduce surface defects such as lines, the die must have a structure that minimizes the stagnation area, and it is necessary to use a die or a lip that has as few scratches as possible. preferable.
  • the thickness of the sheet is usually 5 to 500 ⁇ , preferably 10 to: 150 ⁇ ⁇ , and more preferably 20 to 100 # m. If the thickness of the sheet is too thin, the strength will decrease. Conversely, if the sheet is too thick, the transparency is poor, the birefringence is high, the appearance is reduced, and drying is difficult when the sheet is prepared by a solution casting method.
  • a thickness of 80 m or more is usually required to provide sufficient moisture resistance and strength
  • a thermoplastic norbornene-based resin sheet has a thickness of about 30 im. If it is thick, it can have moisture resistance, heat resistance, and strength equal to or higher than that of a TAC film with a thickness of 80 zm, and even if it is thin, it functions sufficiently as a protective layer and has good visual dependency. You.
  • the thickness unevenness of the sheet is within ⁇ 5%, preferably ⁇ 3%, more preferably ⁇ 2% of the average thickness over the entire surface. If the sheet has a large uneven thickness, it may cause distortion of the image and dispersion of the retardation, and is not preferred as a protective layer of a polarizing film for a liquid crystal display.
  • the light transmittance of this sheet is 80% or more, preferably 85% or more, and more preferably 90% or more.
  • the heat resistance of this sheet is determined by the type of thermoplastic saturated norbornene resin, the type of solvent used, and the residual solvent concentration when prepared by a solution casting method. The higher the residual solvent concentration, the lower the heat resistance.
  • the thermoplastic saturated norbornene resin forming a sheet has a glass transition temperature (Tg) of usually 90 ° C or higher, preferably 110 or higher, particularly preferably 120 or higher. desirable.
  • the liquid crystal display / polarizing film of the present invention is obtained by laminating a thermoplastic saturated norbornene resin sheet as a protective layer on at least one surface of the polarizing film.
  • a protective layer is provided on only one side, the polarizing film is protected from the humidity around the liquid crystal display. Therefore, in manufacturing a liquid crystal display, it is necessary to make the protective layer outside the optical film.
  • protective layers are laminated on both sides to maintain the quality of the polarizing film before manufacturing the LCD, prevent the polarizing film from absorbing moisture during the manufacturing process, prevent the degree of polarization from decreasing due to heating, and protect from scratches. It is preferable.
  • a protective layer made of a conventionally known material may be provided on one side.
  • Lamination of a thermoplastic saturated norbornene-based resin sheet on a polarizing film is usually performed using an adhesive or an adhesive and by an adhesion method suitable for the adhesive or the adhesive.
  • the pressure-sensitive adhesive it is preferable to use a pressure-sensitive adhesive which has excellent transparency, small birefringence, etc., and which can sufficiently exhibit pressure-sensitive adhesive force even when used as a thin layer.
  • adhesives include natural rubber, synthetic rubber, elastomer, vinyl chloride / vinyl acetate copolymer, polyvinyl alkyl ether, polyacrylate, modified polyolefin resin adhesive, and the like.
  • a curable pressure-sensitive adhesive is preferable among pressure-sensitive adhesives used for bonding a polyolefin foam or a polyester film.
  • an adhesive used for bonding polyethylene, polypropylene, or the like can be used for laminating a thermoplastic saturated norbornene-based resin sheet on a polarizing film.
  • an adhesive for dry laminating which mixes a polyurethane resin solution and a polyisocyanate resin solution, a styrene-butadiene rubber-based adhesive, an epoxy-based two-liquid curing adhesive, for example, a two-liquid epoxy resin and polythiol And two-part epoxy resin and polyamide, especially solvent-based adhesives and epoxy two-part curing type.
  • Adhesives are preferred, and transparent ones are preferred. Some adhesives can improve the adhesive strength by using an appropriate adhesive primer. When such an adhesive is used, it is preferable to use an adhesive primer.
  • a protective layer in order to improve the workability of laminating a liquid crystal substrate or a transparent electrode layer laminated on the liquid crystal substrate, when a protective layer is provided on both surfaces, the protective film is usually provided on one surface. However, when a protective layer is provided on one side, it is preferable to laminate an adhesive layer on the side having no protective layer.
  • the pressure-sensitive adhesive As the pressure-sensitive adhesive, the pressure-sensitive adhesive described above can be used. However, when the pressure-sensitive adhesive layer is not laminated on a liquid crystal substrate or the like immediately after lamination, a curable pressure-sensitive adhesive is not preferable. When an adhesive layer is provided, usually a release film such as release paper or a release film is further laminated on the surface of the liquid crystal display so that the polarizing film does not adhere to surroundings before manufacturing the liquid crystal display. It is preferable to keep it.
  • the appropriate thickness of the pressure-sensitive adhesive layer is usually 5 to 40 m.
  • a polarizing film is manufactured and then laminated on a liquid crystal substrate or the like.
  • a polarizing film is laminated on a liquid crystal substrate or the like via an adhesive layer, and then the adhesive is formed.
  • a polarizing film integrated with a liquid crystal substrate or the like can also be manufactured by a method of laminating a protective layer on the substrate.
  • the number average molecular weight was measured by the GPC method using toluene as a solvent.
  • the hydrogenation rate was measured by 1 H-NMR.
  • the glass transition temperature (T g) was measured by the DSC method.
  • the light transmittance was measured with a spectrophotometer while continuously changing the wavelength in the wavelength range of 400 to 700 nm, and the minimum transmittance was defined as the light transmittance.
  • MTD 6-Methyl-1,4,5,8-dimethanone 1,4,4a, 5,6,7,8,8a-titahidronaphthalene
  • MTD 6-Methyl-1,4,5,8-dimethanone 1,4,4a, 5,6,7,8,8a-titahidronaphthalene
  • triethyl as a polymerization catalyst 10 parts of a 15% cyclohexane solution of aluminum, 5 parts of triethylamine, and 10 parts of a 20% cyclohexane solution of titanium tetrachloride were added, and ring-opening polymerization was performed in cyclohexane.
  • the obtained ring-opened polymer was hydrogenated with a Nigel catalyst to obtain a polymer solution.
  • This polymer solution was coagulated in isopropyl alcohol and dried to obtain a powdery resin.
  • This resin had a number average molecular weight of 40,000, a hydrogenation ratio of 99.8% or more, and a
  • the resin film was peeled off from the glass plate, dried for 30 minutes in an open at 90 ° C., cooled to room temperature, and a sheet of 10 mm in circumference was cut off to obtain a sheet.
  • the residual solvent concentration of this sheet was 1.2% by weight.
  • T g is 13.8, average thickness is 80 / m, thickness unevenness is at most ⁇ 4 / im or less, light transmittance is 91.0%, and absolute retardation value is 3 nm over the entire surface It was below.
  • Water vapor permeability of this sheet is converted to a thickness of 2 5 e C, 9 in an environment of RH 0% 3. 0 g / m 2 ⁇ 2 4 hr (2 5 m to about 1 2 g 2 ⁇ 24 hr).
  • a styrene-butadiene rubber-based adhesive (S cotch 3M adhesive by application plastic, Sumitomo Sleam Co., Ltd.) is used on both sides of a PVA polarizing film (thickness of about 100 / ⁇ ) stretched by adsorbing iodine.
  • An 80 m thick thermoplastic norbornene-based resin sheet was laminated as a protective layer.
  • the heat cycle test was repeated 200 times for 1 hour at a humidity of 90%, a temperature of 80, 1 hour, and a temperature of 20 hours, but no abnormality was found.
  • TAC sheet water vapor transmission
  • Example 2 An 80 ⁇ m thick TAC sheet (water vapor transmission) was applied to both sides of the same polarizing film used in Example 1 using a dry laminating adhesive (AD-329 AZB, manufactured by Nogawa Chemical). The rate was 210 g / z ⁇ 24 hr) in a 25 ° C., 90% RH environment as a protective layer.
  • AD-329 AZB dry laminating adhesive
  • the resin film was peeled off from the glass plate, dried for 10 minutes by opening at 90, cooled to room temperature, and then cut around the width of 10 mm to obtain a sheet.
  • the residual solvent concentration of this sheet was below the measurement limit of 0.1% by weight.
  • T g 1339 ° C
  • average thickness 30 m
  • thickness unevenness is at most ⁇ 4 // m or less
  • light transmittance is 91.2%
  • absolute absolute value of letter value is 3 nm or less.
  • This sheet has a water vapor permeability of 9.5 g / m 2 ⁇ 24 hr (approx. 11 gZm 2 ⁇ 24 hr in 25 / m thickness at 25 ° C and 90% RH). ) 7Z o
  • An epoxy-based two-part curable adhesive (Hyper Super 30, Cemedine Co., Ltd.) was used on both sides of the same polarizing film used in Example 1, and an adhesive primer was applied to the adhesive surface (Unistor P, Mitsui Petrochemical) After a thin coating of Industrial Co., Ltd., a 30 / m thick thermoplastic saturated norbornene-based resin sheet was laminated as a protective layer.
  • a polarizing film excellent in water resistance, moisture resistance, physical strength, heat resistance, transparency, low birefringence, adhesion to an adhesive, durability to an adhesive, and the like is provided.
  • the polarizing film of the present invention is laminated on a liquid crystal substrate or the like via an adhesive layer, bubbles are generated between the protective layer and the adhesive layer of the polarizing film because the protective layer and the adhesive layer are well adapted. Hateful. Further, the liquid crystal does not function when it has moisture. However, in the liquid crystal display using the polarizing film of the present invention, the liquid crystal is hardly eroded by moisture due to its excellent moisture resistance, and the life is extended.
  • the polarizing film of the present invention is very useful in the field of a liquid crystal display.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Polarising Elements (AREA)
  • Liquid Crystal (AREA)

Abstract

Film polariseur pour afficheur à cristaux liquides, dans lequel une feuille de résine thermoplastique saturée de la série des norbornanes est stratifiée sous forme de couche protectrice sur au moins une surface dudit film. Ce film polariseur présente une étanchéité à l'eau et à l'humidité, une résistance physique et thermique et une transparence excellentes, une faible biréfringence ainsi qu'une adhérence et une durabilité d'adhésion élevées.
PCT/JP1992/000927 1991-07-22 1992-07-21 Film polariseur pour afficheur a cristaux liquides WO1993002381A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP20552291A JP3297450B2 (ja) 1991-07-22 1991-07-22 液晶ディスプレイ用偏光フィルム
JP3/205522 1991-07-22

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WO1993002381A1 true WO1993002381A1 (fr) 1993-02-04

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US5516456A (en) * 1994-02-24 1996-05-14 Japan Synthetic Rubber Co., Ltd. Liquid crystal display panel
WO2003081299A1 (fr) * 2002-03-25 2003-10-02 Zeon Corporation Film optique et son procede de production

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US7015276B2 (en) 2000-10-02 2006-03-21 Sekisui Chemical Co., Ltd. Melt-moldable thermoplastic norbornene resin composition and molded article and optical film both comprising the same
JP2002196132A (ja) * 2000-12-25 2002-07-10 Sumitomo Chem Co Ltd 偏光板の製造方法
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US6840635B2 (en) 2001-05-14 2005-01-11 Nitto Denko Corporation Polarizer and method of producing the same
JP2003043252A (ja) 2001-07-31 2003-02-13 Sekisui Chem Co Ltd 偏光子保護フィルム
JP2003057439A (ja) * 2001-08-09 2003-02-26 Toray Ind Inc 光学フィルムおよびその製造方法
JP2003232930A (ja) * 2002-02-13 2003-08-22 Nippon Zeon Co Ltd 積層体及びその製造方法
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JPH0651117A (ja) 1994-02-25

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