Classifications

• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B5/00—Optical elements other than lenses
  • G02B5/30—Polarising elements
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
  • C08J5/18—Manufacture of films or sheets
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B5/00—Optical elements other than lenses
  • G02B5/30—Polarising elements
  • G02B5/3016—Polarising elements involving passive liquid crystal elements
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
  • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
  • B29K2105/0079—Liquid crystals
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J2300/00—Characterised by the use of unspecified polymers
  • C08J2300/12—Polymers characterised by physical features, e.g. anisotropy, viscosity or electrical conductivity

Definitions

• the present invention relates to a method for producing a liquid crystal film and an elliptically polarizing plate useful for various optical elements.
• Thin films (films) composed of an alignment layer of a liquid crystal compound are used as elements for color compensation and viewing angle compensation for liquid crystal display devices.
• it has excellent performance as an optical rotatory optical element, etc., and contributes to high performance and light weight of various display elements.
• a method for producing these films a method has been proposed in which a layer made of a liquid crystal material formed on an alignment substrate is transferred onto a light-transmitting substrate also serving as a support substrate (Japanese Patent Laid-Open No. 570/1990). No. 17, Japanese Patent Application Laid-Open No. 4-1777-1216).
• a layer made of a liquid crystal material which is aligned and formed on an alignment substrate is once transferred to a removable substrate via an adhesive, and then the removable substrate is separated.
• an optical element comprising a liquid crystal material layer without a supporting substrate film.
• the removable substrate used here requires mechanical strength and good release properties, except for a surface coat such as silicone or fluororesin, or an optically isotropic film that has been subjected to another surface treatment.
• a surface coat such as silicone or fluororesin
• an optically isotropic film that has been subjected to another surface treatment.
• it has been limited to films having optical anisotropy such as biaxially oriented polyester and biaxially oriented polypropylene.
• the optically isotropic film There are few types of the optically isotropic film, and it cannot be said that the releasability, heat resistance, strength, film thickness, etc., are sufficient for the production of the liquid crystal material layer, and many are expensive. .
• the liquid crystal material layer formed on the substrate is to be inspected as it is at the time of manufacture, the liquid crystal material layer is affected by the birefringence.
• it is extremely difficult to detect optical defects such as foreign matter, bright spots, and color unevenness, and at present the compatibility between defect detection and good peelability has not been sufficiently solved.
• An object of the present invention is to solve the above-mentioned problems, and to facilitate the detection of optical defects and to improve the releasability at the time of re-peeling in a method for producing a thinned liquid crystal film without a supporting substrate film.
• the use of an axially stretched polyester film satisfies the mechanical strength and good releasability required at the time of manufacture, and at the same time facilitates inspection for optical defects. And finally arrived at the present invention.
• the first aspect of the present invention is that, after bonding a liquid crystal material layer having a fixed liquid crystal orientation on an alignment substrate to a removable substrate made of a uniaxially stretched polyester film via an adhesive, And transferring the liquid crystal material layer to a removable substrate, and then removing the removable substrate.
• the liquid crystal material layer in which the orientation of the liquid crystal on the orientation substrate is fixed is adhered to a removable substrate made of a uniaxially stretched polyester film via an adhesive, and then the orientation is performed.
• the present invention relates to a method for manufacturing an elliptically polarizing plate, comprising: separating a substrate, transferring a liquid crystal substance layer to a removable substrate, and then peeling the removable substrate, and then attaching a polarizing plate.
• the uniaxially stretched polyester is made of polyethylene terephthalate or a polyester mainly composed of the same.
• the present invention will be described in detail.
• the liquid crystal material layer in which the orientation of the liquid crystal used in the present invention is fixed is a layer fixed by using a means for fixing the liquid crystal material in the aligned state.
• a step in the case of a polymer liquid crystal substance, it is rapidly cooled from the alignment state and fixed in a vitrified state, and after the low molecular or polymer liquid crystal substance having a reactive functional group is oriented, the functional groups are reacted. (Curing, crosslinking, etc.).
• Examples of the reactive functional group include a vinyl group, a (meth) acryloyl group, a vinyloxy group, an epoxy group, an oxetane group, a carboxyl group, a hydroxyl group, an amino group, an isocyanate group, and an acid anhydride group.
• the reaction is carried out in a manner appropriate for the group of
• the liquid crystal material that can be used in the liquid crystal material layer can be selected from a wide range, regardless of whether it is a low-molecular liquid crystal material or a high-molecular liquid crystal material, depending on the intended use and manufacturing method of the liquid crystal film. Substances are preferred. Further, regardless of the molecular shape of the liquid crystal substance, whether it is rod-shaped or disc-shaped, for example, a discotic liquid crystal compound exhibiting discotic nematic liquid crystal properties can also be used.
• liquid crystal phase of the liquid crystal material layer before immobilization examples include a nematic phase, a twisted nematic phase, a cholesteric phase, a hybrid nematic phase, a hybrid twisted nematic phase, a discotic nematic phase, and a smectic phase.
• the polymer liquid crystal material various main chain polymer liquid crystal materials, side chain polymer liquid crystal materials, or a mixture thereof can be used.
• the main-chain polymer liquid crystal materials include polyester, polyamide, polycarbonate, polyimide, polyurethane, polybenzimidazole, polypentoxazole, polybenzthiazole, Polyazomethine-based, polyesteramide-based, polyestercarbonate-based, polyesterimide-based high-molecular liquid crystal substances, and mixtures thereof.
• the side chain type polymer liquid crystal substance a substance having a linear or cyclic structure skeleton such as polyacrylate, polymethacrylate, polyvinyl, polysiloxane, polyether, polymalonate, or polyester is used. And a liquid crystal material having a mesogen group bonded as a side chain, or a mixture thereof.
• polyesters of the main chain type polymer liquid crystal material are preferable because of ease of synthesis and orientation.
• Low-molecular liquid crystal substances include saturated benzene carboxylic acids, unsaturated benzene carboxylic acids, biphenyl carboxylic acids, aromatic oxy carboxylic acids, Schiff base types, Bisazomethine compounds, azo compounds, azoxy compounds, cyclohexaneester compounds, sterol compounds, etc., having the above-mentioned reactive functional groups introduced at the terminals thereof, exhibiting liquid crystallinity, and exhibiting liquid crystallinity among the above compounds.
• a composition in which a crosslinkable compound is added to the compound shown, and the like can be given.
• the discotic liquid crystal compound include a triphenylene-based compound and a torque-based compound.
• various compounds having a functional group or site capable of reacting by heat or photocrosslinking reaction or the like in the liquid crystal material may be blended within a range that does not hinder the development of liquid crystallinity.
• the functional group capable of performing a cross-linking reaction include the various reactive functional groups described above.
• the liquid crystal material layer in which the orientation of the liquid crystal is fixed is formed by applying a composition containing the liquid crystal material or various compounds to be added as necessary onto an alignment substrate in a molten state, or a solution of the composition.
• the solvent used for preparing the solution is not particularly limited as long as it can dissolve the liquid crystal substance or composition used in the present invention and can be distilled off under appropriate conditions.
• acetone and methyl ethyl ketone Ketones such as isophorone, ether alcohols such as ptoxyshethyl alcohol, hexyloxyethyl alcohol and methoxy-2-propanol; glycol ethers such as ethylene glycol dimethyl ether and diethylene glycol dimethyl ether; ethyl acetate; Esters such as methoxypropyl acetate and ethyl lactate; phenols such as phenol and chlorophenol; amides such as N, N-dimethylformamide, N, N-dimethylacetamide and N-methylpyrrolidone , Black mouth form, tetra black mouth ethane Halogenated hydrocarbons such or a mixture of these systems, such as dichlorobenzene are used properly preferred.
• a surfactant, an antifoaming agent, a leveling agent and the like may be added to the solution in order to form a uniform coating film on the alignment substrate.
• a dichroic dye, a normal dye, a pigment, or the like can be added for the purpose of coloring, as long as the development of liquid crystal properties is not hindered.
• the coating method is not particularly limited as long as uniformity of the coating film is ensured, and a known method can be employed. For example, a roll coat method, a dicoat method, a dip coat method, a curtain coat method, a spin coat method and the like can be mentioned.
• a solvent removing (drying) step by a method such as a heater or hot air blowing may be inserted.
• the thickness of the applied film in a dry state is from 0.2 to 50 m, preferably from 0.2 to 20 m. Outside this range, the optical performance of the obtained liquid crystal material layer becomes insufficient, and the orientation of the liquid crystal material becomes insufficient.
• the orientation of the liquid crystal is formed by heat treatment or the like, and then the orientation is fixed. In the heat treatment, the liquid crystal is aligned by the self-orienting ability inherent to the liquid crystal material by heating the liquid crystal phase to the temperature range in which the liquid crystal phase appears.
• the conditions for the heat treatment cannot be unconditionally determined because the optimum conditions and the limit values vary depending on the liquid crystal phase behavior temperature (transition temperature) of the liquid crystal substance to be used, but it is generally 10 to 300 ° C, preferably 30 to 300 ° C. It is in the range of 250 ° C. If the temperature is too low, the alignment of the liquid crystal may not proceed sufficiently, and if the temperature is high, the liquid crystal material may be decomposed or the alignment substrate may be adversely affected.
• the heat treatment time is usually in the range of 3 seconds to 60 minutes, preferably in the range of 10 seconds to 30 minutes. If the heat treatment time is shorter than 3 seconds, the alignment of the liquid crystal may not be sufficiently completed, and if the heat treatment time is longer than 60 minutes, the productivity is extremely deteriorated. After the alignment of the liquid crystal material is completed by heat treatment or the like, the liquid crystal material layer on the alignment substrate is fixed as it is by using a method suitable for the liquid crystal material used. '
• alignment substrate examples include polyimide, polyamide, polyamide imide, polyphenylene sulfide, polyphenylene oxide, polyether ketone, polyester ether ketone, polyether sulfone, polysulfone, polyethylene terephthalate, and polyethylene naphthalene.
• films include polyarylate, triacetyl cellulose, epoxy resin, and phenol resin.
• these films exhibit sufficient alignment ability with respect to the liquid crystal substance used in the present invention without a treatment for expressing the alignment ability again.
• 2/10608 but if the alignment ability is insufficient or does not show the alignment ability, etc., these films are stretched under appropriate heating, and the film surface is rubbed in one direction with rayon cloth etc.
• a rubbing treatment is performed, a rubbing treatment is performed by providing an orientation film made of a known orientation agent such as polyimide, polyvinyl alcohol, and a silane coupling agent on the film, or an oblique deposition treatment of silicon oxide or the like.
• a film in which the orientation ability is developed by appropriately combining may be used.
• the alignment substrate a metal plate of aluminum, iron, copper, or the like having various regular fine grooves on the surface thereof, or various glass plates can be used.
• the liquid crystal material layer formed on the alignment substrate is bonded to a removable substrate made of a uniaxially stretched polyester film via an adhesive.
• This adhesive has sufficient adhesive strength to the liquid crystal material layer and the uniaxially stretched polyester film as the removable substrate, and is capable of peeling off the uniaxially stretched polyester film in a later step.
• the optical properties of the liquid crystal material layer are not impaired.
• examples include acrylic resin, methacrylic resin, epoxy resin, ethylene-vinyl acetate copolymer, rubber, urethane, and polyvinyl chloride.
• examples thereof include various reactive ones such as a nyl ether type and a mixture type thereof, a thermosetting type and / or a photosetting type, and an electron beam setting type.
• These adhesives include those having the function of a transparent protective layer for protecting the liquid crystal layer. Note that a pressure-sensitive adhesive can also be used as the adhesive.
• the reaction (curing) conditions of the reactive substance vary depending on the components constituting the adhesive, the viscosity, the reaction temperature, and the like. Therefore, conditions suitable for the conditions may be selected.
• various known photoinitiators are preferably added, and a metal halide lamp, a high-pressure mercury lamp, a low-pressure mercury lamp, a xenon lamp, an arc lamp, a laser, a synchrotron radiation light source, or the like is preferably used.
• the reaction may be performed by irradiating light from a light source.
• the irradiation amount per unit area (1 square centimeter) is usually as an integrated irradiation amount:!
• the acceleration voltage for the electron beam curing type is usually 10 kV to 20 kV, preferably 5 kV to 100 kV.
• the thickness of the adhesive varies depending on the components constituting the adhesive, the strength of the adhesive, the operating temperature, and the like as described above, but is usually 1 to 50 mm, preferably 3 to 30 mm. Outside of this range, the adhesive strength is insufficient, and bleeding from the end is not preferred.
• these adhesives may be added with various fine particles or the like for the purpose of controlling optical characteristics as long as the characteristics are not impaired.
• the fine particles include fine particles having a different refractive index from the compound constituting the adhesive, conductive fine particles for improving antistatic performance without impairing transparency, and fine particles for improving abrasion resistance. Specific examples include fine silica, fine alumina, ITO (Indium Tin Oxide) fine particles, silver fine particles, and various synthetic resin fine particles.
• various additives such as an antioxidant and an ultraviolet absorber may be added as long as the effects of the present invention are not impaired.
• the removable substrate used in the present invention is a uniaxially stretched polyester film.
• the composition thereof is not particularly limited, and is preferably an arbitrary one.
• 80% by mole or more of the repeating unit is ethylene terephthalate or ethylene-1,6-naphtholate.
• Other copolymerization components include isofluoric acid, p-/-ethoxyethoxybenzoic acid, 4,4'-dicarboxydiphenyl, 4,4, -dicarboxybenzophenone, bis (4-carboxyphenyl) ) Ethane, adipic acid, sebacic acid, 5-sodium sulfoisophthalic acid, dicarboxylic acid components such as 1,4-dicarboxycyclohexane, propylene glycol, butanediol, neopentyl glycol, diethylene glycol, cyclohexanediol, bisphenol Examples thereof include ethylene oxide adducts of A, polyethylene glycol, polypropylene glycol, and polyol components such as polytetramethylene glycol.
• dicarboxylic acid components and diol components can be used in combination of two or more as necessary. Can be used together. It is also possible to use an oxycarboxylic acid such as P-oxybenzoic acid together with the carboxylic acid component ⁇ the diol component. Further, as other copolymerization component, a compound containing a small amount of an amide bond, a urethane bond, an ether bond, a carbonate bond, or the like may be contained.
• Examples of the method for producing the polyester include an arbitrary production method such as a direct polymerization method in which an aromatic dicarboxylic acid and a diol are directly reacted, and a so-called transesterification method in which an ester exchange reaction is performed between a dimethyl ester of an aromatic dicarboxylic acid and a diol. Can be applied.
• the peel strength of a removable substrate cannot be determined unconditionally even for a removable substrate manufactured from the same material, because it changes depending on the manufacturing method, surface condition, and wettability with the adhesive used.
• the peeling force at the interface with the adhesive (180 ° peeling, peeling speed 30 cm / min, measured at room temperature) is usually 0.38 to 12 N / m, preferably 0.3 It is desirably 8 to 8.0 N / m. If the peeling force is lower than this value, the peeling force is too low when the oriented substrate is peeled off after the liquid crystal material layer on the oriented substrate is bonded to the removable substrate, and the peelable substrate may float.
• the desired state of separation at the desired interface cannot be obtained, and the transfer of the liquid crystal material layer to the removable substrate becomes insufficient. If the peeling force is too high, the removable substrate is peeled. In this case, it is not preferable because the liquid crystal material layer is destroyed or peeling cannot be performed at an interface with a desired layer.
• a lubricant may be contained.
• a lubricant there is no particular limitation on the type and amount of the lubricant as long as it does not adversely affect the testability of optical defects and the releasability.
• Specific examples of the lubricant include fine silica, fine alumina, and the like.
• the haze value of the removable substrate is generally 50% or less, preferably 30% or less. Good. If the haze value is higher than that, it is not preferable because the inspectability of optical defects deteriorates.
• an antiblocking agent for example, the polyester is melted, and the non-oriented polyester extruded into a sheet is horizontally stretched at a temperature equal to or higher than the glass transition temperature at a temperature equal to or higher than a glass transition temperature, and then subjected to a heat fixing treatment.
• the method of applying PT Arm / 10608 includes the steps of: adhering a liquid crystal material layer having liquid crystal alignment fixed on an alignment substrate to a re-peelable substrate made of a uniaxially stretched polyester film via an adhesive; And the liquid crystal material layer is transferred to a removable substrate, and then the removable substrate is released.
• the method for producing the liquid crystal film is not particularly limited except that a uniaxially stretched polyester is used for the removable substrate, but as an example, the liquid crystal film can be produced by the following method.
• a liquid crystal material coating film is formed on an alignment substrate by an appropriate method, the solvent and the like are removed as necessary, and the liquid crystal alignment is completed by heating or the like, and the liquid crystal material is used by a method suitable for the liquid crystal material used.
• the liquid crystal material layer is fixed.
• an adhesive layer is formed on the liquid crystal material layer having the fixed orientation and / or the uniaxially stretched polyester film (removable substrate), and the liquid crystal material layer and the uniaxially stretched polyester film are bonded via the adhesive layer. (Removable substrate) is adhered, and the adhesive layer is reacted (cured) if necessary, and then the oriented substrate is released.
• the liquid crystal material layer having the fixed orientation can be transferred to the removable substrate.
• the liquid crystal is removed by peeling the uniaxially stretched polyester film. Get the film.
• a liquid crystal film is manufactured.
• the liquid crystal material layer formed on the uniaxially stretched polyester film which is a removable substrate during this manufacturing process, can easily detect an optical defect as it is.
• a good peeling state can be obtained without destruction of the liquid crystal material layer due to defective peeling or peeling at other interfaces.
• the method for detecting optical defects is not particularly limited, but the absorption axes of the two polarizing plates are arranged in the orthogonal direction, and a laminated film composed of a uniaxially stretched polyester film and a liquid crystal material layer is arranged between the polarizing plates. Irradiate white light from the bottom of the From a visual observation, an automated method using a line camera, and the like.
• the absorption axes of the polarizers are not necessarily arranged at right angles, and an arbitrary value is set so that optical defects can be easily detected. You can also set the angle.
• a transparent protective layer may be provided on the exposed liquid crystal material layer or a surface protective film may be bonded for protecting the surface of the liquid crystal material layer.
• the transparent protective layer may be selected from the above-mentioned adhesives.
• the liquid crystal material layer on which the alignment of the liquid crystal on the alignment substrate is fixed is bonded to a removable substrate made of a uniaxially stretched polyester film via an adhesive, and then the alignment substrate is removed. Then, the liquid crystal material layer is transferred to the removable substrate, and then the elliptically polarizing plate is manufactured by attaching a polarizing plate to a liquid crystal film obtained by removing the removable substrate.
• the surface of the liquid crystal film to which the polarizing plate is adhered is not particularly limited, and may be on the side where the alignment substrate is peeled off or on the side where the uniaxially stretched polyester film is peeled off.
• the attachment surface of the polarizing plate can be appropriately selected depending on the application, the manufacturing process, and the like.
• the elliptically polarizing plate of the present invention may include one or more layers of an antireflection layer, an antiglare treatment layer, a hard coat layer, and a light diffusion layer, in addition to the polarizing plate and the liquid crystal film.
• the adhesive or the like used for laminating or bonding to the polarizing plate is not particularly limited as long as it is an optical grade, and for example, a suitable one from the above-mentioned adhesives can be used.
• the polarizing plate used for the elliptically polarizing plate of the present invention is not particularly limited as long as the object of the present invention can be achieved, and a polarizing plate usually used for a liquid crystal display device can be appropriately used.
• a thin film type recently developed in recent years is desirable. Specifically, polyvinyl alcohol (PVA) and partial acetalization: iodine and / or two colors are applied to a hydrophilic polymer film composed of a PVA-based polarizing film such as PVA, a partially saponified ethylene-vinyl acetate copolymer, etc.
• a polarizing film formed by adsorbing a hydrophilic dye and stretching, a polarizing film composed of a polyene oriented film such as a dehydrated product of PVA or a dehydrochlorinated product of polyvinyl chloride, or the like can be used. Further, a reflective polarizing film can also be used.
• the polarizing plate may be a single polarizing film, or a polarizing film provided with a transparent protective layer or the like on one or both sides of the polarizing film for the purpose of improving strength, moisture resistance, heat resistance and the like. Is also good.
• the transparent protective layer examples include those obtained by laminating a transparent plastic film such as polyester or triacetyl cellulose directly or via an adhesive layer, a resin coating layer, and a photo-curable resin layer such as an acrylic or epoxy resin. It is. When these transparent protective layers are coated on both sides of the polarizing film, the same transparent protective layer may be provided on both sides, or different transparent protective layers may be provided.
• the film before or after peeling the uniaxially stretched polyester film, the film is bonded or bonded to another optically anisotropic film, and if necessary, the uniaxially stretched polyester film is peeled off.
• Various optical elements having a film can be obtained.
• the liquid crystal material layer formed on the uniaxially stretched polyester film before lamination with the optically anisotropic film can easily detect optical defects in the laminated state as it is. is there.
• a plurality of the above-mentioned various films and layers may be laminated, and the same surface, for example, the liquid crystal material layers may be laminated via an adhesive if necessary.
• various optical elements having the liquid crystal film of the present invention for example, a nematic alignment, a liquid crystal film having a fixed twisted nematic alignment functions as a retardation film,
• Liquid crystal films with fixed cholesteric and smectic orientations include polarizing reflective films for improving brightness, reflective color filters, various anti-counterfeiting devices that make use of the color change of reflected light due to the viewing angle based on selective reflectivity, and It can be used for decorative films.
• a film with a fixed nematic hybrid orientation can be used as a retardation film or a wave plate by using the retardation when viewed from the front, and the orientation of the retardation value (film thickness direction) By utilizing the asymmetry caused by the tilt of the molecular axis), it can be used for films that improve the viewing angle of TN-type liquid crystal displays.
• a liquid crystal film having a quarter-wave plate function is It can be used as an anti-reflection filter for a circularly polarizing plate, a reflection type liquid crystal display device or an EL display device.
• the present invention makes it extremely difficult to use an ordinary releasable substrate. It can easily detect optical defects such as foreign matter, bright spots, and color unevenness in the liquid crystal material layer, and provide good releasability of the releasable substrate. This can be achieved extremely easily by using uniaxially stretched polyester as the removable substrate.
• the logarithmic viscosity of this liquid crystalline polyester (Polymer 1) (phenol / tetrachlorobenzene (6/4 mass ratio) mixed solvent: 30 ° C) is 0.17 d1 / g, and the nematic phase is used as the liquid crystal phase. It had an isotropic phase-liquid crystal phase transition temperature of 250 C or higher and a differential scanning calorimeter (DSC) (the glass transition temperature was 115 ° C).
• UV-curable adhesive (UV-340, manufactured by Toagosei Co., Ltd.) is applied to the liquid crystal material layer 1 (on the side opposite to the polyimide film) to a thickness of 5 m.
• a 38 ⁇ m-thick uniaxially stretched polyethylene terephthalate (hereinafter referred to as PET) film is laminated as a removable substrate on top of this, and a UV of about 60 OmJ is applied.
• PET 38 ⁇ m-thick uniaxially stretched polyethylene terephthalate
• the polyimide film is peeled off from the laminate of the uniaxially stretched PET film adhesive layer / liquid crystal material layer 1 / polyimide film, whereby the liquid crystal material layer 1 is placed on the uniaxially stretched PET film which is a removable substrate. This was transferred to obtain a liquid crystal film laminate 1.
• the absorption axes of the two polarizing plates are arranged in the orthogonal direction, and the 14-inch sized liquid crystal film laminate 1 is stretched in the stretching direction of the uniaxially stretched polyester between them.
• L ⁇ which is the absorption axis of one of the polarizing plates, is installed so that the transmission axis is in the same direction as that of the polarizing plate.
• the white fluorescent lamp is used as the light source from the bottom of the polarizing plate, and the foreign matter in the liquid crystal film laminate 1 is visually observed from the opposite direction. And defects such as scratches were observed.
• UV-curable adhesive (UV-340, manufactured by Toagosei Co., Ltd.) was applied on the liquid crystal material layer 1 (surface opposite to the polyimide film) prepared in the same manner as in Example 1.
• An adhesive layer having a thickness of 5 ⁇ m was formed.
• a biaxially-stretched PET film of 35 / im thickness (trade name “S10”, manufactured by Toray Industries, Inc.) as a removable film for substrate was laminated, and the adhesive layer was cured by UV irradiation of about 60 OmJ.
• the liquid crystal material layer is transferred onto the biaxially stretched PET film by peeling the polyimide film from the laminate of the biaxially stretched PET film / adhesive layer / liquid crystal material layer 1 / polyimide film, and the liquid crystal film is laminated.
• Got body 2 the liquid crystal material layer is transferred onto the biaxially stretched PET film by peeling the polyimide film from the laminate of the biaxially stretched PET film / adhesive layer / liquid crystal material layer 1 / polyimide film, and the liquid crystal film is laminated.
• the absorption axes of the two polarizing plates were arranged in the orthogonal direction, and a 14-inch size liquid crystal film laminate 2 was placed between them.
• a white fluorescent lamp as a light source from below, defects such as foreign matter and scratches in the liquid crystal film laminate 2 were visually observed from the opposite direction.
• an adhesive layer 1 of about 25 / m with a separate film was laminated on the exposed liquid crystal material layer surface of the liquid crystal film laminate 1 obtained in Example 1.
• an adhesive layer 1 of about 25 / m with a separate film was laminated on the exposed liquid crystal material layer surface of the liquid crystal film laminate 1 obtained in Example 1.
• the uniaxially stretched PET film was peeled off from the laminate of the uniaxially stretched PET film Z adhesive layer / liquid crystal material layer 1 Z adhesive layer 1 / separate film.
• the peel force between the uniaxially stretched PET film and the adhesive layer was 2. ON / m.
• a polarizing plate (thickness: about 18 O zm; SQ-1 manufactured by Sumitomo Chemical Co., Ltd.) is provided on the adhesive layer surface of the obtained adhesive layer / liquid crystal material layer 1 / adhesive layer 1 / separate film laminate. 8 5 2 AP) is laminated via an adhesive layer 2 of 25 / m, and the polarizing plate / adhesive layer 2 / adhesive layer / liquid crystal material layer 1 / adhesive layer 1 / separate film An elliptically polarizing plate composed of a laminated body was obtained.
• the liquid crystal film laminate 2 during the manufacturing process has poor inspectability for optical defects due to the birefringence of the biaxially stretched PET film, and has poor peelability when peeling the biaxially stretched PET film. Meanwhile, the area of the normal peeled portion peeling off at the interface between the biaxially stretched PET film and the adhesive layer was about 60% of the whole. Comparative Example 3
• Example 2 Example 2 was repeated except that a 38 m-thick uniaxially stretched PET film was replaced with a 50- ⁇ m-thick acrylic resin film (trade name “Acryprene” manufactured by Mitsubishi Rayon Co., Ltd.). In the same manner as in 2, the liquid crystal film laminate 3 was obtained. The peel strength between the acrylic resin film “Acryprene” and the adhesive layer was 31 N / m.
• Example 2 except that a 38 / m-thick uniaxially stretched PET film was replaced by a 50 / m-thick TPX film (trade name: Obulin “X44B”, manufactured by Mitsui Chemicals, Inc.) In the same manner as in Example 2, a liquid crystal film laminate 4 was obtained. The peel force between the TPX film “X44B” and the adhesive layer was 0.2 N / m.
• Example 2 a biaxially-stretched film having a thickness of 50 im: PET film (trade name “T60”, manufactured by Toray Industries, Inc.) was used in place of the uniaxially-stretched PET film having a thickness of 38 ⁇ m.
• a liquid crystal film laminate 5 was obtained in the same manner as in Example 2 except for the above.
• the peel force between the biaxially stretched ⁇ film “ ⁇ 60” and the adhesive layer was 4.5 N / m.
• the liquid crystal film laminate 5 has poor inspectability for optical defects due to the birefringence of the biaxially stretched PET film, and has poor peelability when peeling the “T60” film.
• “ ⁇ 60” The area of the normal peeled portion that peeled off at the film / adhesive layer interface was about 30% of the entire area. Comparative Example 6
• Example 2 a biaxially stretched PET film (trade name “# 52”, manufactured by Teijin Limited) having a thickness of 50 mm was used in place of the uniaxially stretched PET film having a thickness of 38 mm.
• a liquid crystal film laminate 6 was obtained in the same manner as in Example 2 except for the above.
• the peel force between the “# 52” film and the adhesive layer was 0.77 N / m.
• Example 2 in place of the uniaxially stretched PET film having a thickness of 38 / m, a silicone surface coated uniaxially stretched PET film having a thickness of 50 m (trade name "# 51", manufactured by Teijin Limited) A liquid crystal film laminate 7 was obtained in the same manner as in Example 2, except that was used.
• the peeling force between the “# 51” film and the adhesive layer was 2. ON / m.
• the liquid crystal film laminate ⁇ was poor in inspecting optical defects due to the birefringence of the biaxially stretched PET film.
• the peelability of the “# 51” film was good, and normal peeling at the “# 51” film / adhesive layer interface was possible.
• Table 1 summarizes the results of Example 2 and Comparative Examples 2 to 7. Table 1

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