KR20050057319A - Liquid crystal film and elliptical polarizing plate production method - Google Patents

Abstract

A method for producing a thinned liquid crystal film with no support base film provides a mechanical strength required during the production process and a favorable releasability and enables an easy optical defect test. A liquid crystal material layer where the alignment of the liquid crystal on an alignment substrate is fixed is joined to a re-releasable substrate through an adhesive containing a surface modifier, the alignment substrate is separated to transfer the liquid crystal material layer to the re-releasable substrate, and the re-releasable substrate is separated, thus producing a liquid crystal film.

Description

Liquid crystal film and elliptical polarizing plate manufacturing method {LIQUID CRYSTAL FILM AND ELLIPTICAL POLARIZING PLATE PRODUCTION METHOD}

The present invention relates to a method for producing a liquid crystal film and an elliptical polarizing plate useful for various optical elements.

A thin film (film) consisting of an alignment layer of a liquid crystal compound, in particular a film made of a liquid crystal material in which an alignment of a nematic structure or a twisted nematic structure is immobilized is used as a device for color compensation and a viewing angle compensation for a liquid crystal display device. It has excellent performance as an optical element, etc., and contributes to the high performance and light weight of various display elements. As a manufacturing method of such a film, the method of transferring the layer which consists of the liquid crystal substance formed on the orientation board | substrate on the light transmissive substrate which also serves as a support substrate is proposed (Japanese Unexamined-Japanese-Patent No. 4-57017, Unexamined-Japanese-Patent No. 4-177216, etc.). In addition, as a countermeasure for enduring the excessive durability test required for the liquid crystal display device, a method of manufacturing an optical device made of a liquid crystal material which does not use a support substrate film for further thinning and weight reduction has been proposed. 8-278491).

According to this manufacturing method, an optical layer made of a liquid crystal material layer without a supporting substrate film is obtained by transferring a layer of an alignment liquid crystal material formed on an alignment substrate to a releasable substrate once through an adhesive and then peeling off the releasable substrate. The device can be manufactured. Moreover, the manufacturing method which uses a uniaxially-stretched polyester film as a repeelable board | substrate is also proposed in order to satisfy the mechanical strength and favorable peelability required at the time of manufacture, and at the same time to facilitate an optical defect inspection (patent 2001-313506).

However, even when a uniaxially stretched polyester film is used, the conditions under which optical defect inspection can be performed are limited in terms of the bonding angle with an optical element such as a compensating plate for a liquid crystal display element and an axis arrangement point with a polarizing plate used for observation. When observing in the direction, there is a problem that defects are easily observed due to residual birefringence effect. On the other hand, defect inspection standards for optical devices such as viewing angle compensation plates for active liquid crystal display devices are particularly strict, and there are problems in that fine defects of several tens of micrometers are easily visible even when uniaxially stretched polyester is used.

In order to improve the testability, it is preferable to use an optically more isotropic film as little as possible to be birefringent, but it is possible to satisfy peelability, strength, film thickness, etc. necessary for the production of the liquid crystal material layer without the supporting substrate film. It is true that there is almost no optically isotropic film present, and in particular, it is extremely difficult to realize the required proper peelability because the peelability is difficult to be adjusted.

Summary of the Invention

This invention solves the said subject, and in the manufacturing method of the liquid crystal film thinned without a support substrate film, it is easy to detect an optical defect, and for the purpose of making the peelability at the time of peeling good, with a releasable board | substrate. As a result of earnestly examining the adhesive used for adhesion, by using the adhesive which added the surface modifier, it can satisfy | fill moderate peeling property required at the time of manufacture, and can improve optical defect inspection property by the use of an optically isotropic film at the same time. It has been found that the present invention has been completed.

That is, according to the first aspect of the present invention, after the liquid crystal material layer on which the liquid crystal alignment is immobilized on the alignment substrate is adhered to the releasable substrate through the adhesive to which the surface modifier is added, the alignment substrate is peeled off and the liquid crystal material layer is reattached. It transfers to a peelable board | substrate, and then peels a repeelable board | substrate, It is related with the manufacturing method of the liquid crystal film characterized by the above-mentioned.

According to a second aspect of the present invention, a liquid crystal material layer having a liquid crystal orientation fixed on an alignment substrate is bonded to a re-peelable substrate through an adhesive to which a surface modifier is added, and then the alignment substrate is peeled off to re-peel the liquid crystal material. The present invention relates to a method for manufacturing an elliptical polarizing plate, wherein the polarizing plate is adhered to the substrate after transfer to the substrate and then peeled off on the releasable substrate.

According to a third aspect of the present invention, after bonding a liquid crystal material layer having a liquid crystal alignment immobilized thereon on an alignment substrate with a first releasable substrate through an adhesive, the alignment substrate is peeled off and the liquid crystal material layer is first releasable. Transferred to the substrate, and then adhered to the second releasable substrate via an adhesive to which the surface modifier was added, the first releasable substrate was peeled off, and the liquid crystal material layer was transferred to the second releasable substrate. It is related with the manufacturing method of the liquid crystal film characterized by peeling a 2nd re peelable board | substrate.

In addition, the fourth aspect of the present invention, after adhering the liquid crystal material layer of the liquid crystal alignment is fixed on the alignment substrate with the first re-peelable substrate via an adhesive, the alignment substrate is peeled off and the liquid crystal material layer is first Transfer to the peelable substrate, and then adhered to the second releasable substrate by means of an adhesive to which the surface modifier is added; then, the first releasable substrate is peeled off and the liquid crystal material layer is transferred to the second releasable substrate. Next, after a 2nd re peelable board | substrate peeling, it is related with the manufacturing method of the elliptical polarizing plate characterized by bonding a polarizing plate.

Hereinafter, the present invention will be described in detail.

The liquid crystal material layer in which the liquid crystal alignment used in the present invention is immobilized is a layer immobilized by using a means for immobilizing a liquid crystal material in an alignment state, and in the case of a polymer liquid crystal material as a means for immobilization, the liquid crystal material layer is quenched from an alignment state and vitrified. And a method of immobilizing a low molecular or polymeric liquid crystal material having a reactive functional group and then immobilizing the functional group by reacting (curing, crosslinking, etc.).

The reactive functional group includes a vinyl group, a (meth) acryloyl group, a vinyloxy group, an epoxy group, an oxetanyl group, a carboxyl group, a hydroxyl group, an amino group, an isocyanate group, an acid anhydride, and the like, and reacts with each group by a suitable method.

The liquid crystal material that can be used for the liquid crystal material layer can be selected from various ranges regardless of the low molecular liquid crystal material or the polymer liquid crystal material according to the intended use or production method of the liquid crystal film, but the polymer liquid crystal material is preferable. In addition, the molecular shape of the liquid crystal material may be in the form of a rod but may be in the form of a disc. For example, a discotic liquid crystal compound exhibiting discotic nematic liquid crystal can also be used.

Examples of the liquid crystal phase of the liquid crystal material layer before immobilization 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.

As the polymer liquid crystal material, various main chain polymer liquid crystal materials, side chain polymer liquid crystal materials, or a mixture thereof may be used. The main chain polymer liquid crystal material may be polyester, polyamide, polycarbonate, polyimide, polyurethane, polybenzimidazole, polybenzoxazole, polybenzthiazole, polyazomethine or polyesteramide. Polymer liquid crystal materials such as polyesters, polyester carbonates, and polyester imides, or mixtures thereof. The side chain type polymer liquid crystal material has a linear or cyclic skeletal chain such as polyacrylate, polymethacrylate, polyvinyl, polysiloxane, polyether, polymalonate or polyester. There is a polymer liquid crystal material, or a mixture thereof, in which a mesogenic group is bonded as a side chain to a substance. Among these, the polyester type which is a main chain type | mold polymer liquid crystal material is preferable because of synthesis | combination, an ease of orientation, etc.

Examples of the low molecular liquid crystal materials include saturated benzene carboxylic acids, unsaturated benzene carboxylic acids, biphenyl carboxylic acids, aromatic oxy carboxylic acids, Schiff bases, bis azomethine compounds, azo compounds, azoxy compounds, and cyclohexane. The compound which showed the liquid crystallinity which introduce | transduced the said reactive functional group in the terminal, such as ester compounds and a sterol compound, and the composition which added the crosslinking | crosslinked compound to the compound which shows liquid crystal among the said compounds are mentioned. Examples of the discotic liquid crystal compound include triphenylene and tolkene.

Moreover, you may mix | blend the various compound which has a functional group or site | part which can react by a heat or a photocrosslinking reaction, etc. in a liquid crystal material within the range which does not prevent liquid crystalline expression. Examples of the functional group capable of crosslinking reaction include various reactive functional groups described above.

The liquid crystal material layer having a fixed liquid crystal orientation may be formed by applying a liquid crystal material or a composition containing various compounds added as necessary on an alignment substrate in a molten state, or applying a solution of the composition on an alignment substrate. The coating film formed on the alignment substrate is dried, heat treated (liquid crystal alignment), and immobilized by using means for fixing the above-described orientation such as light irradiation and / or heat treatment (polymerization, crosslinking) as necessary. By forming.

As for the solvent used for preparing the solution, there is no particular limitation as long as it is a solvent that can dissolve the liquid crystal material and the composition used in the present invention and is distilled off under appropriate conditions. Generally, acetone, methyl ethyl ketone, isophorone and the like are used. Ether alcohols such as ketones, butoxyethyl alcohol, hexyloxyethyl alcohol and methoxy-2-propanol; glycol ethers such as ethylene glycol dimethyl ether and diethylene glycol dimethyl ether; ethyl acetate, methoxy propyl acetate, and lactic acid Esters such as ethyl, phenols such as phenol and chlorophenol, amides such as N, N-formamide, N, N-dimethylacetoamide, and N-methylpyrrolidone, such as chloroform, tetrachloroethane and dichlorobenzene Halogenated hydrocarbons, etc., or these mixed systems can be used preferably. In addition, in order to form a uniform coating film on the alignment substrate, a surfactant, an antifoaming agent, a leveling agent, or the like may be added to the solution. In addition, for coloring purposes, dichroic dyes or ordinary dyes or pigments and the like may be added within a range that does not interfere with liquid crystalline expression.

As for the coating method, any known method can be employed without particular limitation as long as the uniformity of the coating film is ensured. For example, there are a roll coating method, a die coating method, a dip coating method, a curtain coating method, a spin coating method, and the like. After coating, a solvent removal (drying) step may be added by a method such as a heater or warm air blowing. The film thickness in the dry state of the applied film is 0.1 µm to 50 µm, preferably 0.2 µm to 20 µm. Outside this range, the optical performance of the formed liquid crystal material layer is poor, and it is not preferable for reasons such as insufficient alignment of the liquid crystal material.

Subsequently, if necessary, after forming a liquid crystal orientation by heat processing etc., orientation fixation is performed. The heat treatment is to align the liquid crystal by the self-orientation ability originally possessed by the liquid crystal material by heating in the liquid crystal phase expression temperature range. The heat treatment conditions are not specified because the optimum conditions and limit values vary depending on the liquid crystal phase behavior temperature (transition temperature) of the liquid crystal material used, but are usually 10 to 300 ° C, preferably 30 to 250 ° C. . At lower temperatures, the liquid crystal alignment may not proceed sufficiently, and at higher temperatures, the liquid crystal material may decompose or adversely affect the alignment substrate. Moreover, in heat processing time, it is the range of 3 second-60 minutes normally, Preferably it is 10 second-30 minutes. In the heat treatment time shorter than 3 seconds, the liquid crystal alignment may not be sufficiently completed, and in the heat treatment time over 60 minutes, the productivity is extremely poor, which is not preferable in any case. After the liquid crystal material has completed the liquid crystal alignment by heat treatment or the like, the liquid crystal material layer on the alignment substrate is fixed in such a state by means suitable for the liquid crystal material used.

As an orientation board | substrate, polyimide, polyamide, polyamideimide, polyphenylene sulfide, polyphenylene oxide, polyether ketone, polyether ether ketone, polyether sulfone, polysulfone, polyethylene terephthalate, polyethylene naphthalate, polya Films, such as a related, triacetyl cellulose, an epoxy resin, and a phenol resin, are mentioned.

Although some of these films exhibit sufficient orientation ability with respect to the liquid crystal material used in the present invention even without performing a treatment for expressing the improved orientation ability, the films have insufficient orientation performance or orientation performance. In this case, these films are stretched under appropriate heating; Rubbing treatment of the film surface in one direction with a rayon cloth or the like, or rubbing treatment after providing an alignment film formed of a known alignment agent such as polyimide, polyvinyl alcohol, silane coupling agent on the film, or the like. ; You may use the film which expressed the orientation capability by tetragonal deposition processes, such as a silicon oxide, or an appropriate combination process of these.

Further, as the alignment substrate, metal plates such as aluminum, iron or copper, and various glass plates in which a large number of fine grooves are formed on the surface can also be used.

The liquid crystal material layer formed on the alignment substrate is then adhered to the releasable substrate through the adhesive to which the surface modifier is added.

Such an adhesive is not particularly limited as long as it has sufficient adhesion to the liquid crystal material layer and the releasable substrate, and is capable of peeling off the releasable substrate in a later step, and does not impair the optical properties of the liquid crystal material layer. . For example, various reactivity such as acrylic resins, methacryl resins, epoxy resins, ethylene-vinyl acetate copolymers, rubbers, urethanes, polyvinyl ethers and mixtures thereof, or thermosetting and / or photocuring, electron beam curing, etc. There is to be. These adhesives include those having the function of a transparent protective layer protecting the liquid crystal material layer. Moreover, an adhesive can also be used as said adhesive agent.

The reaction (curing) conditions for the reactive ones vary depending on the components constituting the adhesive, the viscosity, the reaction temperature and the like, and therefore, appropriate conditions may be selected and performed. For example, in the case of a photocuring type, various well-known photoinitiators are added, and the light derived from light sources, such as 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, is irradiated. The reaction may be carried out. The irradiation dose per unit area (1 cm 2) is usually in the range of 1 to 2000 mJ, preferably 10 to 1000 mJ. However, when the spectrum of a photoinitiator absorption region and a light source differs remarkably, or when a reactive compound has the absorption ability of a light source wavelength by itself, it is not limited to this. In such a case, a method such as using a suitable photosensitizer or two or more kinds of photoinitiators having different absorption wavelengths may be used. In the case of the electron beam curing type, the acceleration voltage is usually 10 kV to 200 kV, preferably 50 kV to 100 kV.

The thickness of the adhesive varies depending on the components constituting the adhesive as described above, adhesive strength or use temperature, and the like, but is usually 1 to 50 µm, preferably 3 to 30 µm. Outside this range, it is not preferable because the adhesive strength is insufficient or the adhesive is extruded from the edge.

Moreover, the said adhesive agent can add various microparticles | fine-particles etc. which aim at the control of an optical characteristic in the range which does not impair the characteristic. Examples of the fine particles include fine particles different in refractive index from the compound constituting the adhesive, conductive fine particles for improving antistatic performance, fine particles for improving wear resistance, and the like, without impairing transparency, and more specifically, fine silica and fine alumina. , ITO (indium oxide) fine particles, silver fine particles, various synthetic resin fine particles and the like. Moreover, you may mix | blend various additives, such as antioxidant and a ultraviolet absorber, in the range which does not impair the effect of this invention.

The surface modifier added to the adhesive is not particularly limited as long as it has good compatibility with the adhesive and does not affect the curability of the adhesive and the optical performance after curing, and is an ionic or nonionic water-soluble surfactant, an oil-soluble surfactant, a polymer interface. Various surfactants, such as organometallic surfactants, such as active agent, a fluorine-type surfactant, and silicone type surfactant, a reactive surfactant, can be used. In addition, these surfactants include all monomer types, oligomer types, and polymer types. Anionic surfactants include carboxylate, sulfonate, acetate ester, and phosphate esters. Cationic surfactants include quaternary ammonium salts, amine salts, imidazoline, and the like. The sulfonic acid type, the acetate ester salt type, and the like, and the nonionics include polyethylene glycol type, polyhydric alcohol aliphatic (partial) ester type, alkylphenol ethylene oxide type, alcohol ethylene oxide type, polyolefin ethylene oxide block copolymer type and the like.

In particular, fluorine-based surfactants such as perfluoroalkyl compounds and perfluoropolyether compounds, or organometallic surfactants such as silicone-based surfactants are particularly preferred because of their high surface modification effects.

By adding the above surface modifying agent to the adhesive, it is possible to suppress the erosion of the adhesive on the releasable substrate and to appropriately control the peeling force. In other words, when the surface modifier is not added, adhesive erosion is strong, and after peeling the re-peelable substrate, clouding may occur on the surface of the substrate, or the peeling force may not be controlled, which may interfere with the manufacturing process. By adding, peelability improved significantly.

At this time, the addition amount of the surface modifier is preferably in the range of 0.01 to 10% by mass, particularly preferably 0.05 to 5% by mass, more preferably 0.1 to 3% by mass with respect to the adhesive. If the amount is smaller than this range, the effect of addition is insufficient, and if it is high, there is a fear that adverse effects such as decrease in adhesive strength may occur. In addition, a surface modifier may be used independently and may use multiple types together as needed.

The releasable substrate used in the present invention includes olefinic films such as polyethylene, polypropylene, and 4-methylpentene-1 resin, polyamide, polyimide, polyamideimide, polyetherimide, polyether ketone, and polyether ether. Ketones, polyethersulfones, polyketonesulfides, polysulfones, polystyrenes, polyphenylenesulfides, polyphenylene oxides, polyethylene terephthalates, polybutylene terephthalates, polyarylates, polyacetals, uniaxially stretched polyesters, polycarbonates, Films such as polyvinyl alcohol, polymethyl methacrylate, polyarylate, amorphous polyolefin, norbornene-based resin, triacetylcellulose or epoxy resin can be used.

In particular, in the optically isotropic film having excellent optical defect inspection properties, 4-methylpentene-1, polymethyl methacrylate, polystyrene, polycarbonate, polyethersulfone, polyarylate, amorphous polyolefin, norbornene-based resin, tri There are various films such as acetyl cellulose or epoxy resin.

In order to give moderate re-peelability to such plastic films, silicon may be coated on the surface in advance, or an organic thin film or an inorganic thin film may be formed. In addition, for the same purpose, the surface of the plastic film may be subjected to chemical treatment or physical treatment such as corona treatment. Moreover, in order to adjust the peelability of a re peelable board | substrate, you may add a lubricating agent. In the case where the lubricant is added, the type and amount of the lubricant are not particularly limited as long as it does not adversely affect optical defect inspection properties and peelability. Specific examples of the lubricant include microsilica, microalumina, and the like, and the index of the added amount may be such that the haze value of the releasable substrate is usually 50% or less, preferably 30% or less. If the haze value is higher than that, the inspectability of the optical defect deteriorates, which is not preferable.

Moreover, you may contain other well-known various additives, for example, an antiblocking agent, antioxidant, an antistatic agent, a heat stabilizer, an impact resistance improving agent, etc. as needed.

The peeling force of the releasable substrate cannot be collectively determined even if the releasable substrate made of the same material is changed by the manufacturing method, the surface state, and the chargeability with the adhesive used. The peel force (180 ° peeling, peeling rate 30 cm / min, measured at room temperature) is usually 0.38 to 12 N / m, preferably 0.38 to 8.0 N / m. When the peeling force is lower than this value, the liquid crystal material layer on the alignment substrate is bonded to the releasable substrate, and then when the alignment substrate is peeled off, when the peeling force is low, the phenomenon of floating on the releasable substrate appears. If the good peeling state of the film cannot be obtained, the transfer of the liquid crystal material layer to the releasable substrate becomes insufficient, and if the peeling force is high, the breakage of the liquid crystal material layer when peeling the releasable substrate, or with the preferred layer It is not preferable because of problems such as not being able to be peeled off at the interface.

According to the first method of the method of manufacturing a liquid crystal film, the liquid crystal material layer on which the liquid crystal alignment is immobilized on the alignment substrate is adhered to the releasable substrate through an adhesive to which a surface modifier is added. The material layer is transferred to the releasable substrate, and then the releasable substrate is peeled off.

The manufacturing method of the liquid crystal film is not particularly limited except for using an adhesive to which a surface modifier is added, and may be manufactured by the following method as an example.

That is, on the alignment substrate, a coating film of the liquid crystal material is formed by a suitable method, the solvent and the like are removed as necessary, the liquid crystal alignment is completed by heating or the like, and the alignment of the liquid crystal material layer is fixed by means suitable to the used liquid crystal material. do. Subsequently, an adhesive layer is formed on the liquid crystal material layer and / or the releasable substrate on which the orientation is fixed, and the liquid crystal material layer and the releasable substrate are brought into close contact with each other through the adhesive layer, and then the adhesive layer is reacted as necessary. After curing), the alignment substrate is peeled off.

In this way, the liquid crystal material layer having the fixed orientation can be transferred onto the releasable substrate. In the present invention, after obtaining a laminate made of a liquid crystal material layer adhered by interposing an adhesive on the releasable substrate, a liquid crystal film may be obtained by peeling the releasable substrate. In this way, a liquid crystal film is produced.

In the obtained liquid crystal film, in order to protect the surface of a liquid crystal material layer, you may apply a transparent protective layer to the exposed liquid crystal material layer, or may bond a surface protection film. As a transparent protective layer, it can select from the adhesive agent mentioned above.

In the present invention, the second method of the method for manufacturing a liquid crystal film comprises bonding a liquid crystal material layer having a liquid crystal orientation fixed on the alignment substrate with a first releasable substrate through an adhesive, and then peeling the alignment substrate to form a liquid crystal material layer. Is transferred to the first releasable substrate, and then adhered to the second releasable substrate using an adhesive having a surface modifier added to the alignment substrate peeling surface side, and then the first releasable substrate is peeled off and the liquid crystal material layer Is transferred to a second releasable substrate, and then the second releasable substrate is peeled off.

In the case of this manufacturing method, although optical isotropy is not specifically required for a 1st re peelable board | substrate, it can select arbitrarily from the above-mentioned re peelable board | substrate. In addition, the adhesive may have sufficient adhesive strength to the liquid crystal material layer and the first releasable substrate, and may peel off the first releasable substrate in a subsequent step, and does not impair the optical properties of the liquid crystal material layer. If not, there is no special limitation, and the above-mentioned adhesive agent can be used. In this case, the surface modifying agent is not necessarily added.

On the other hand, the second re-peelable substrate is preferably optically isotropic from the viewpoint of inspectability, and specifically 4-methylpentene-1, polymethyl methacrylate, polystyrene, polycarbonate, polyether sulfone, polyarylate, Each film, such as amorphous polyolefin, norbornene-type resin, polyacetyl cellulose, or an epoxy resin, is mentioned. In addition, the adhesive force to which the above-mentioned surface modifier was added can be used for adhesion of a 2nd peelable board | substrate, and the peeling force of a 2nd peelable board | substrate can be adjusted easily, and the selection range of a peelable board | substrate can be expanded.

In the above-described manufacturing method, the liquid crystal material layer formed on the releasable substrate of the first method, in particular, the second releasable substrate of the second method, can easily detect optical defects as it is.

The detection method of the optical defect is not particularly limited, but the absorption axes of the two polarizing plates are arranged in the orthogonal direction, and the laminated film composed of the re-peelable substrate and the liquid crystal material layer is disposed therebetween, and white light is irradiated from below the polarizing plate. For example, the method of visual observation in the opposite direction or an automated method using a line camera can be mentioned. Depending on the retardation of the liquid crystal material layer (the product of the birefringence and the thickness of the liquid crystal material layer), the absorption axis of the polarizing plate may be set at any angle at which optical defects are easily detected without necessarily orthogonal arrangement.

In the present invention, the liquid crystal material layer in which the alignment of the liquid crystal on the alignment substrate is fixed is bonded to the releasable substrate through an adhesive to which a surface modifier is added, and then the alignment substrate is peeled off to reattach the liquid crystal material layer. An elliptical polarizing plate is produced by adhering a polarizing plate to the liquid crystal film obtained by transferring to and then peeling off a re-peelable substrate.

In addition, in the present invention, the liquid crystal material layer on which the liquid crystal alignment is fixed on the alignment substrate is bonded to the first releasable substrate using an adhesive, and then the alignment substrate is peeled off to form the liquid crystal material layer. The second releasable substrate is adhered to the second substrate using the adhesive having the surface modifier added to the alignment substrate peeling surface, and then the first releasable substrate is peeled off to form the liquid crystal material layer on the second releasable substrate. The elliptically polarizing plate is manufactured by adhering the polarizing plate to the liquid crystal film obtained by transferring to the second peelable substrate and then peeling off.

The surface to which the polarizing plate of the liquid crystal film is adhered is not particularly limited, and may be the side of the alignment substrate peeling surface, or may be the side of the peeling surface of the first releasable substrate. The adhesive face of a polarizing plate can be suitably selected according to a use, a manufacturing process, etc.

The elliptical polarizing plate of the present invention may contain one or more layers of an antireflection layer, an antiglare 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 bonding or adhering with the polarizing plate is not particularly limited so long as it is an optical grade. For example, a suitable one can be used among the adhesives described above.

The polarizing plate used in the elliptical polarizing plate of the present invention can be used by appropriately selecting a polarizing plate commonly used in liquid crystal display devices without particular limitation, as long as the object of the present invention can be achieved, but is preferably developed and marketed in recent years. It is preferable that it is a thin film type. Specifically, an oxo and / or dichroic dye is adsorbed and stretched on a hydrophilic polymer film made of PVA-based polarizing film such as polyvinyl alcohol (PVA) or partially acetalized PVA, or partially saponified ethylene-vinyl acetate copolymer. The polarizing film etc. which consist of a polyene oriented film, such as a polarizing film, a PVA dehydration process, and a polyvinyl chloride dehydrochlorination thing, etc. can be used. Moreover, a reflective polarizing film can also be used.

The said polarizing plate may be used independently of a polarizing film, and may provide the transparent protective layer etc. to one or both surfaces of a polarizing film for the purpose of strength improvement, torsion resistance improvement, moisture resistance improvement, heat resistance improvement, etc. As a transparent protective layer, what laminated | stacked the transparent plastic film, such as polyester, triacetyl cellulose, and polymethyl methacrylate directly or via the contact bonding layer, the photocurable resin layer, such as a resin coating layer, acrylic type, or epoxy type, etc. have. When covering such a transparent protective layer on both surfaces of a polarizing film, the same transparent protective layer may be provided on both sides, and a different transparent protective layer may be provided.

In addition, in the said manufacturing process, before peeling a 1st repeelable board | substrate or a 2nd repeelable board | substrate, or after peeling, it bonds or adheres with another optically anisotropic film, and peels a repeelable board | substrate as needed. Thereby, various optical elements having a liquid crystal film can be obtained.

Also in such an optical element, by using an optically isotropic re-peelable substrate, the liquid crystal material layer formed on the first re-peelable substrate or the second re-peelable substrate prior to bonding with the optically isotropic film is optically stacked. Defects can be easily detected.

Furthermore, if necessary, a plurality of the above films and layers may be laminated, and the same surfaces, for example, liquid crystal material layers, may be bonded to each other via a point or adhesive as necessary.

Of the various optical elements having the liquid crystal film of the present invention, for example, a liquid crystal film having a fixed nematic orientation and a twisted nematic orientation function as a retardation film, and transmit such as STN type, TN type, OCB type, and HAN type. Or it can be used as a compensating plate of a reflective liquid crystal display device. The liquid crystal film in which cholesteric alignment or smectic alignment is fixed can be used for various anti-counterfeiting elements or decorative films which use color change of reflected light depending on the time due to the polarization reflecting film for improving luminance, the reflective color filter, and the selective reflecting ability. It is available. In addition, the film which fixed the nematic hybrid orientation can be used as a retardation film or a wave plate using retardation when it sees from the front, and also asymmetry by the improvement of retardation value (molecular axis inclination of the film thickness direction). It can be used for a viewing angle improvement film of a TN type liquid crystal display device using a castle. In addition, a liquid crystal film having a quarter wave plate function can be used as an antireflection filter of a circular polarizing plate, a reflective liquid crystal display device or an EL display device together with a polarizing plate.

Best Mode for Carrying Out the Invention

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to these Examples.

(Production example)

Polycondensation reaction was carried out at 270 ° C. for 12 hours under nitrogen atmosphere using 50 mmol of terephthalic acid, 50 mmol of 2,6-naphthalenedicarboxylic acid, 40 mmol of methylhydroquinone diacetate, 60 mmol of catechol diacetate and 60 mg of N-methylimidazole. It was. The reaction product obtained in succession was dissolved in tetrachloroethane and purified through methanol reprecipitation to give 14.6 g of liquid crystalline polyester. The intrinsic viscosity (phenol / tetrachloroethane = 6/4 (mass ratio) mixed solvent: 30 degreeC measurement) of this liquid crystalline polyester (polymer 1) shows a nematic phase as 0.16 dl / g and a liquid crystal phase, and isotropic phase- The liquid crystal phase transition temperature was 250 degreeC or more, and the glass transition temperature by the differential scanning calorimeter (DSC) was 112 degreeC.

90 mmol of biphenyldicarbonyl chloride, 10 mmol of terephthaloyl chloride, and 105 mmol of S-2-methyl-1,4-butanediol were reacted in dichloromethane at room temperature for 20 hours, and the reaction solution was added to methanol to reprecipitate to form a liquid crystalline poly. 12.3 g of ester were obtained. The intrinsic viscosity of this liquid crystalline polyester (polymer 2) was 0.11 dl / g.

A solution was prepared by dissolving 19.82 g of polymer 1 and 0.18 g of polymer 2 in 80 g of N-methyl-2-pyrrolidone. This solution was applied by spin coating onto a polyimide film ("KAPTON", manufactured by DuPont) rubbed with rayon cloth, and the solvent was dried and then heat-treated at 210 ° C for 20 minutes to form a twisted nematic alignment structure. After the heat treatment, it was quenched to room temperature to fix the twisted nematic alignment structure to obtain a liquid crystal material layer uniformly oriented with an actual film thickness of 3.0 mu m on the polyimide film (liquid crystal material layer 1). Actual film thickness was measured using a tactile film thickness meter.

(Example 1)

Silicone-based surface modifier (product name, "Pain-Tad M", Dow Corning) on a commercially available UV curable adhesive (UV-3400, manufactured by Toagosei Co., Ltd.) on the first liquid crystal material layer obtained on the first side (opposite side of the polyimide film). Adhesive 1 to which 0.5 mass% of Ajia was added was apply | coated to thickness of 5 micrometers, and commercially norbornene-type film (product name "Esshina") of 40 micrometers in thickness as a re-peelable board | substrate on this, Red Chemical Industry Co., Ltd. )) Film) was laminated and the adhesive layer 1 was cured by UV irradiation of about 600 mJ. Thereafter, the polyimide film is peeled from the laminate of estina film / adhesive layer 1 / liquid crystal material layer 1 / polyimide film to transfer the liquid crystal material layer 1 onto the esina film which is a releasable substrate, thereby forming the liquid crystal film laminate 1 Obtained.

Subsequently, in order to investigate the optical defect in the liquid crystal film laminated body 1, the two polarizing plate absorption axes are arrange | positioned orthogonally, and the 14-inch size liquid crystal film laminated body 1 is installed between them, and a white fluorescent lamp is light-emitting from the lower part of a polarizing plate. As a result, defects such as foreign matter and scars in the liquid crystal film laminate 1 were visually observed from the opposite direction.

As a result, defect inspection could be easily performed without being affected by the releasable substrate. At this time, the time required for the inspection of the liquid crystal film laminate 1 was 9 seconds.

On the exposed liquid crystal material layer surface of the obtained liquid crystal film laminated body 1, about 25 micrometers of adhesive layer 1 with a separator film was laminated | stacked. Subsequently, the estina film was peeled off from the laminate of the estina film / adhesive layer 1 / liquid crystal material layer 1 / adhesive layer 1 / separator film. The peeling force between the estina film and the adhesive bond layer 1 was 2.2 N / m. Moreover, it was 0.6% when the haze value of the laminated body which consists of adhesive bond layer 1 / liquid crystal material layer 1 / adhesive layer 1 which peeled a separator film was measured.

Subsequently, a polarizing plate (thickness of about 180 μm; manufactured by Juwoo Chemical Industries, Ltd., SQ-1852AP) was placed on one surface of the adhesive layer 1 of the adhesive layer 1 / liquid crystal material layer 1 / adhesive layer 1 / separator film laminate obtained above. An elliptically polarizing plate composed of a laminate in which a pressure-sensitive adhesive layer 2 was laminated through a medium and a polarizing plate / adhesive layer 2 / adhesive layer 1 / liquid crystal material layer 1 / adhesive layer 1 / separator film was integrated was obtained.

In the manufacturing process, not only the optical defect inspection property of the liquid crystal film laminated body 1 was favorable, but the peelability of the escina film was extremely good, and normal peeling was possible at the interface of the escina film and the adhesive bond layer 1.

(Comparative Example 1)

Lamination of Esina film / adhesive layer 2 / liquid crystal layer 1 / polyimide film in the same manner as in Example 1 except that the surface modifier was not added to the UV curable adhesive (Aronix UV-3400) in Example 1. By peeling the polyimide film from the sieve, the liquid crystal material layer was transferred onto the esina film to obtain a liquid crystal film laminate 2.

As a result of observing the optical defect of the liquid crystal film laminate 2 by the same method as in Example 1, defect inspection could be easily performed without being affected by the releasable substrate. At this time, the time required for the inspection of the liquid crystal film laminate 2 was 10 seconds.

About 25 micrometers adhesive layer 1 for adhesion of a separator film was laminated | stacked on the exposed liquid crystal material layer surface of the liquid crystal film laminated body 2 obtained. Subsequently, the estina film was peeled off from the laminate of the estina film / adhesive layer 2 / liquid crystal layer 1 / adhesive layer 1 / separator film. The peeling force between the estina film and the adhesive bond layer 2 was 4.5 N / m, and turbidity generate | occur | produced in the peeling interface. Moreover, it was 5.2% when the haze value of the laminated body which consists of adhesive agent layer 2 / liquid crystal material layer 1 / adhesive layer 1 which peeled a separator film further was measured.

In the manufacturing process, although the inspection property was favorable, the peelability deteriorates in peeling of an esci film, and the area of the normal peeling part peeled at the interface of an esci film and the adhesive bond layer 2 is about the whole. 20%.

(Example 2)

1.0 mass of a fluorine-based surface modifier (product name "Floride FX-8" manufactured by 3M) instead of the silicone-based surface modifier "Paintad M" as a surface modifier added to the UV-curable adhesive (Aronix UV-3400) in Example 1 It carried out similarly to Example 1 except having used 50 micrometers thick acryl-type films (product name "Acryrene", Mitsubishi Rayon Co., Ltd. product) instead of the adhesive agent 3 and the escinar film which added%, and an acriprene film / adhesive agent By peeling the polyimide film from the layer 3 / liquid crystal material layer 1 / polyimide film laminate, the liquid crystal material layer was transferred onto the acriprene film to obtain a liquid crystal film laminate 3.

As a result of observing the optical defect of the liquid crystal film laminate 3 by the same method as in Example 1, the defect inspection could be easily performed without being affected by the releasable substrate. At this time, the time required for the inspection of the liquid crystal film laminate 3 was 12 seconds.

About 25 micrometers adhesive layer 1 for adhesion of a separator film was laminated | stacked on the exposed liquid crystal material layer surface of the obtained liquid crystal film laminated body 3. Subsequently, the acriprene film was peeled off from the laminate of the acriprene film / adhesive layer 3 / liquid crystal material layer 1 / adhesive layer 1 / separator film. The peel force between the acriprene film and the adhesive layer 3 was 2.8 N / m. Moreover, it was 0.4% when the haze value of the laminated body which consists of adhesive bond layer 3 / liquid crystal material layer 1 / adhesive layer 1 which peeled a separator film further was measured.

Subsequently, 25 micrometers of polarizing plates (about 180 micrometers in thickness; SQ-1852AP made from Juwoo Chemical Co., Ltd.) are on the adhesive layer 3 surface of the adhesive bond layer 3 / liquid crystal material layer 1 / adhesive layer 1 / separator film laminated body which were obtained above. The adhesive layer 2 was laminated, and the elliptical polarizing plate which consists of a laminated body in which the polarizing plate / adhesive layer 2 / adhesive layer 3 / liquid crystal material layer 1 / adhesive layer 1 / separator film was integrated was obtained.

Not only the optical defect inspection property of the liquid crystal film laminated body 3 was favorable during the manufacturing process, but also the peelability of an acriprene film was extremely favorable, and normal peeling was possible at the interface of an acriprene film and the adhesive bond layer 3.

(Comparative Example 2)

In Example 2, the same procedure as in Example 2 was conducted except that no surface modifier was added to the UV curable adhesive (Aronix UV-3400), and the acriprene film / adhesive layer 2 / liquid crystal layer 1 / polyimide film By peeling the polyimide film from the laminate, the liquid crystal material layer was transferred onto the acriprene film to obtain a liquid crystal film laminate 4.

As a result of observing the optical defect of the liquid crystal film laminated body 4 by the method similar to Example 1, defect inspection could be performed easily, without being influenced by a removable board | substrate. At this time, the time required for the inspection of the liquid crystal film laminate 4 was 10 seconds.

On the exposed liquid crystal material layer surface of the obtained liquid crystal film laminated body 4, about 25 micrometers adhesive layer 1 for adhesion of a separator film was laminated | stacked. Subsequently, the acriprene film was peeled from the laminate of the acriprene film / adhesive layer 2 / liquid crystal material layer 1 / adhesive layer 1 / separator film. The peeling force between the acriprene film and the adhesive layer 2 was 23 N / m, which was too large, causing cloudiness on the peeling interface. Moreover, it was 7.4% when the haze value of the laminated body which consists of adhesive bond layer 2 / liquid crystal material layer 1 / adhesive layer 1 which peeled a separator film further was measured.

In the manufacturing process, the liquid crystal film laminate 4 had good testability, but the peelability deteriorated in the peeling of the acriprene film, and the area of the normal peeling part peeled off at the interface between the acriprene film and the adhesive layer 2 was about the whole. 10%.

(Example 3)

In Example 1, without adding a surface modifier to the UV curable adhesive (Aronix UV-3400), instead of escina film, a silicon-coated biaxially stretched polyethylene terephthalate film (trade name "# 52", product name "# 52", instead of essin film) A polyimide film was prepared from the laminate of # 52 PET film / adhesive layer 2 / liquid crystal material layer 1 / polyimide film, except that Shikiisha Chemical Co., Ltd. (hereinafter referred to as # 52 PET film) was used. By peeling, the liquid crystal material layer was transferred onto the # 52 PET film.

0.75% by mass of a fluorine-based surface modifier (product name "Megapak F470", product of Dai Nippon Ink Chemical Co., Ltd.) on a UV curable adhesive (Aronix UV-3400) on one exposed liquid crystal material layer surface of the laminate thus obtained. The added adhesive 4 was applied to a thickness of 5 μm, and a commercially available triacetyl cellulose film (manufactured by Fuji Photo Film Co., Ltd.) having a thickness of 40 μm was laminated thereon as a second re-peelable substrate, through UV irradiation of about 600 mJ. The adhesive layer 4 was cured to obtain a laminate composed of # 52 PET film / adhesive layer 2 / liquid crystal layer 1 / adhesive layer 4 / triacetylcellulose film. Then, the liquid crystal film laminated body 5 which consists of adhesive bond layer 2 / liquid crystal material layer 1 / adhesive bond layer 4 / triacetyl cellulose film was obtained by peeling a # 52 PET film from this laminated body.

As a result of performing optical defect observation in the same manner as in Example 1, defect inspection could be easily performed without being affected by the releasable substrate. At this time, the time required for the inspection of the liquid crystal film laminate 5 was 12 seconds.

About 25 micrometers of adhesive layers 1 for adhesion of a separator film were laminated | stacked on the adhesive bond layer 2 surface of the obtained liquid crystal film laminated body 5. Subsequently, the triacetyl cellulose film was peeled from the laminate composed of the triacetyl cellulose film / adhesive layer 4 / liquid crystal layer 1 / adhesive layer 2 / adhesive layer 1 / separator film. The peel force between the triacetylcellulose film and the adhesive layer 4 was 2.5 N / m. Moreover, it was 0.3% when the haze value of the laminated body which consists of adhesive bond layer 4 / liquid crystal material layer 1 / adhesive bond layer 2 / adhesive layer 1 which peeled a separator film further was measured.

Subsequently, the polarizing plate (thickness about 180 micrometers; product SQ made by Juwoo Chemical Industry Co., Ltd.) on the adhesive layer 4 surface of the laminated body which consists of adhesive layer 4 / liquid-crystal material layer 1 / adhesive layer 2 / adhesive layer 1 / separator film which were obtained above. -1852AP) was laminated via a 25 μm pressure sensitive adhesive layer 2, and an elliptically polarizing plate made of a laminate in which a polarizing plate / adhesive layer 2 / adhesive layer 4 / liquid crystal layer 1 / adhesive layer 2 / adhesive layer 1 / separator film was integrated. Obtained.

In the manufacturing process, the liquid crystal film laminated body 5 not only showed the inspection property of an optical defect but also the peelability of a triacetyl cellulose film was very favorable, and normal peeling was possible at the interface of a triacetyl cellulose film and the adhesive bond layer 4. As shown in FIG.

(Comparative Example 3)

In Example 3, the adhesive layer 2 / liquid crystal was carried out in the same manner as in Example 3, except that no surface modifier was added to the UV curable adhesive (Aronix UV-3400) when the triacetylcellulose was attached as the second releasable substrate. A liquid crystal film laminate 6 consisting of a material layer 1 / adhesive layer 2 / triacetylcellulose film was obtained.

As a result of performing optical defect observation in the same manner as in Example 1, defect inspection could be easily performed without being affected by the releasable substrate. At this time, the time required for the inspection of the liquid crystal film laminate 6 was 11 seconds.

About 25 micrometers adhesive layer 1 for adhesion of a separator film was laminated | stacked on the 2 exposed adhesive bond layer layers of the liquid crystal film laminated body 6 obtained. Subsequently, the triacetyl cellulose film was attempted to be peeled from the triacetyl cellulose film / adhesive layer 2 / liquid crystal layer 1 / adhesive layer 2 / adhesive layer 1 / separator film laminate, but the adhesive force was strong and could not be peeled at all.

In the manufacturing process, the liquid crystal film laminate 6 had good testability, but was very poor in peeling of the triacetyl separator film, and a normal peeling part could not be obtained at the interface between the triacetyl cellulose film and the adhesive layer 2.

(Example 4)

In Example 3, as a surface modifier added to the UV curable adhesive (Aronix UV-3400), a fluorine-based surface modifier (product name "Saffron S-381)" Asahi Shoshi Kabushiki instead of the silicone-based surface modifier "Paintad M". A biaxially stretched polyethylene terephthalate film (product name "T60" (hereinafter, referred to as T60PET film) and Toray Chemical Co., Ltd.) having a thickness of 50 µm was used in place of the adhesive 5 and the escinar film to which 1.5 mass% of Kaisha was added. A liquid crystal material layer was transferred onto the T60PET film by peeling the polyimide film from the laminate of the same procedure as in Example 1 except for the T60PET film / adhesive layer 5 / liquid crystal material layer 1 / polyimide film.

Furthermore, 1.2 mass% of fluorine-based surface modifiers (product name "Unidine DS-501", manufactured by Digging Industry Co., Ltd.) were added to the UV curable adhesive (Aronix UV-3400) on the exposed liquid crystal material surface of the obtained laminate. One adhesive 6 was applied to a thickness of 5 μm, and a commercially available polycarbonate film (manufactured by Jong-Kyun Chemical Co., Ltd.) having a thickness of 50 μm was laminated thereon as a second re-peelable substrate, through UV irradiation of about 600 mJ. The said adhesive layer 6 was hardened and the laminated body which consists of T60PET film / adhesive layer 5 / liquid crystal material layer 1 / adhesive layer 6 / polycarbonate film was obtained. Then, the T60PET film was peeled from this laminate to obtain a liquid crystal film laminate 7 composed of an adhesive layer 5 / liquid crystal layer 1 / adhesive layer 6 / polycarbonate film.

As a result of performing optical defect observation in the same manner as in Example 1, defect inspection could be easily performed without being affected by the releasable substrate. At this time, the time required for the inspection of the liquid crystal film laminate 7 was 10 seconds.

About 25 micrometers of adhesive layers 1 for adhesion of a separator film were laminated | stacked on the adhesive bond layer 5 surface of the obtained liquid crystal film laminated body 7. Next, the polycarbonate film was peeled from the laminate of the polycarbonate film / adhesive layer 6 / liquid crystal material layer 1 / adhesive layer 5 / adhesive layer 1 / separator film. The peel force between the polycarbonate film and the adhesive layer 6 was 2.1 N / m. Moreover, it was 0.4% when the haze value of the laminated body which consists of adhesive bond layer 6 / liquid crystal material layer 1 / adhesive bond layer 5 / adhesive layer 1 which peeled a separator film again was measured.

Subsequently, a polarizing plate (thickness of about 180 μm; Juju Chemical Industries, Ltd. product SQ) was formed on the adhesive layer 6 surface of the laminate obtained by the above-described adhesive layer 6 / liquid crystal layer 1 / adhesive layer 5 / adhesive layer 1 / separator film. -1852AP) was laminated via a 25 μm pressure-sensitive adhesive layer 2, and an elliptically polarizing plate made of a laminate in which a polarizing plate / adhesive layer 2 / adhesive layer 6 / liquid crystal layer 1 / adhesive layer 5 / adhesive layer 1 / separator film was integrated. Obtained.

In the manufacturing process, the liquid crystal film laminated body 7 was not only excellent in optical defect inspection property, but also the peelability of a polycarbonate film was extremely good, and normal peeling was possible at the interface of a polycarbonate film and the adhesive bond layer 6.

(Comparative Example 4)

In Example 4, it carried out similarly to Example 4 except not having added a surface modifier to both the UV curable adhesive (Aronix UV-3400) at the time of adhering a 1st re peelable board | substrate and a 2nd re peelable board | substrate. And the liquid crystal film laminated body 8 which consists of adhesive bond layer 2 / liquid crystal material layer 1 / adhesive bond layer 2 / polycarbonate film was obtained.

However, the peelability of T60PET which is a 1st re peelable substrate was inferior, and the transcription | transfer defect which does not transfer from T60PET generate | occur | produced.

As a result of performing optical defect observation on the transfer top portion in the same manner as in Example 1, defect inspection could be easily performed without being affected by the releasable substrate. At this time, the time required for the liquid crystal film laminate 8 inspection was 13 seconds.

About 25 micrometers of adhesive layers 1 for adhesion of a separator film were laminated | stacked on the exposed adhesive bond layer 2 surface of the obtained liquid crystal film laminated body 8. Next, the polycarbonate film was peeled from the polycarbonate film / adhesive layer 2 / liquid crystal material layer 1 / adhesive layer 2 / adhesive layer 1 / separator film laminate. The peeling force between the polycarbonate film and the adhesive layer was very high at 31 N / m, causing cloudiness at the peeling interface. Moreover, it was 5.3% when the haze value of the laminated body which consists of adhesive bond layer 2 / liquid crystal material layer 1 / adhesive bond layer 2 / adhesive layer 1 which peeled a separator film again was measured.

In the manufacturing process, although the inspection property was favorable, the liquid-crystal film laminated body 8 was inferior in peeling property in both peeling of T60PET and a polycarbonate film, and peeled at the interface of T60PET and the adhesive bond layer 2, and also a polycarbonate film and an adhesive bond layer The area of the normal peeling part peeled off at the interface of 2 was about 5% of the whole.

  The present invention is optically isotropic in combination with easy detection of optical defects such as foreign matter, bright spots, and color unevenness of the liquid crystal film layer and excellent peelability of the releasable substrate, which are extremely difficult when a conventional releasable substrate is used. The combination of a releasable substrate and an adhesive with a surface modifier is extremely easy to achieve.

Claims (6)

After the liquid crystal material layer on which the liquid crystal alignment is fixed on the alignment substrate is bonded to the releasable substrate through the adhesive to which the surface modifier is added, the alignment substrate is peeled off to transfer the liquid crystal material layer to the releasable substrate. A method for producing a liquid crystal film, comprising peeling a releasable substrate.  After the liquid crystal material layer on which the liquid crystal alignment is fixed on the alignment substrate is bonded to the releasable substrate through the adhesive to which the surface modifier is added, the alignment substrate is peeled off to transfer the liquid crystal material layer to the releasable substrate. After peeling a repeelable board | substrate, the polarizing plate is adhere | attached, The manufacturing method of the elliptical polarizing plate characterized by the above-mentioned. After the liquid crystal material layer on which the liquid crystal alignment is fixed on the alignment substrate is adhered to the first releasable substrate through an adhesive, the alignment substrate is peeled off to transfer the liquid crystal material layer to the first releasable substrate, and then the surface thereof. After adhering the second releasable substrate with an adhesive to which the modifier is added, the first releasable substrate is peeled off to transfer the liquid crystal material layer to the second releasable substrate, and then the second releasable substrate is transferred. Method for producing a liquid crystal film, characterized in that the peeling.  After the liquid crystal material layer on which the liquid crystal alignment is fixed on the alignment substrate is adhered to the first releasable substrate through an adhesive, the alignment substrate is peeled off to transfer the liquid crystal material layer to the first releasable substrate, and then the surface thereof. After adhering the second releasable substrate with an adhesive to which the modifier is added, the first releasable substrate is peeled off to transfer the liquid crystal material layer to the second releasable substrate, and then the second releasable substrate is transferred. A polarizing plate is bonded after peeling, The manufacturing method of the elliptical polarizing plate characterized by the above-mentioned. The method for producing a liquid crystal film according to claim 1 or 3, wherein the surface modifier added to the adhesive is composed of a fluorine-based surfactant or a silicone-based surfactant. The method of manufacturing an elliptical polarizing plate according to claim 2 or 4, wherein the surface modifier added to the adhesive is composed of a fluorine-based surfactant or a silicone-based surfactant.