WO2006112149A1

WO2006112149A1 - Liquid crystal film and laminated film for optical devices

Info

Publication number: WO2006112149A1
Application number: PCT/JP2006/303535
Authority: WO
Inventors: Kenji Hosaki; Haruyoshi Sato; Junichiro Tanimoto; Tetsuya Uesaka; Takeshi Kataoka
Original assignee: Nippon Oil Corporation
Priority date: 2005-03-31
Filing date: 2006-02-21
Publication date: 2006-10-26
Also published as: KR20080012857A

Abstract

A liquid crystal film produced by laminating a cured acrylic resin layer, a liquid crystal layer whose orientation is fixed, and a cured acrylic resin layer in this order, characterized in that at least one of the cured acrylic resin layers has a glass transition temperature (Tg) of 50 to 200˚C. This film is a thin liquid crystal film whose liquid crystal alignment layer does not suffer surface imperfections such as cracking even in a severe environmental test such as a dry-heat/damp-heat cycle test.

Description

Liquid crystal film and laminated film for optical element

[Technical field]

The present invention relates to a liquid crystal film useful for various optical elements and a laminated film for an optical element laminated with a polarizing film. Light

[Background]

In recent years, optical films used in liquid crystal display devices have been required to have higher durability in addition to excellent optical performance. In particular, liquid crystal display devices for mobile devices such as mobile phones and in-cars are required to pass rigorous environmental tests assuming various book usage conditions.

A thin film (film) made of an alignment layer of a liquid crystal compound, especially a film made of a liquid crystal material with a nematic structure, a twisted nematic structure, or a nematic hybrid structure fixed, is used for color compensation and viewing angle compensation for liquid crystal display elements. As an element, it has excellent performance as an optical rotatory optical element, etc., contributing to higher performance and weight reduction of various display elements. As 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 translucent substrate that also serves as a support substrate (for example, Patent Documents 1 to 3). reference.).

Furthermore, as a measure to endure the severe durability test required for liquid crystal display elements, and for further reduction in thickness and weight, an optical element made of a liquid crystal material that does not use a support substrate film is used. A manufacturing method has also been proposed (see, for example, Patent Document 4). According to this manufacturing method, after the layer made of the liquid crystal substance formed on the orientation substrate is transferred to the releasable substrate once through the adhesive, the releasable substrate is peeled off. It became possible to manufacture optical elements consisting of a liquid crystal material layer without a support substrate film.

Usually, these films are used by being bonded to a polarizing plate or a retardation film. However, an optical film manufactured from an alignment layer of a liquid crystal compound can be used in, for example, a long cycle test between a high temperature environment test and a high temperature high humidity environment test. As a result, the liquid crystal alignment layer cannot easily follow the contraction of the polarizing plate, and appearance abnormalities such as cracks and deformation tend to occur. In particular, in the case of a polymer liquid crystal in which the liquid crystal material layer in which the alignment is fixed is aligned at a temperature equal to or higher than the liquid crystal transition point and becomes a glassy state at a temperature equal to or lower than the liquid crystal transition point, the molecular weight is balanced with the liquid crystal alignment property. There was a limit to increasing the mechanical strength of the liquid crystal material layer, for example by increasing the thickness.

(1) Patent Document 1: Japanese Patent Laid-Open No. 4570570

(2) Patent Document 2: JP-A-4-177216

(3) Patent Document 3: Japanese Patent Laid-Open No. 6-242434

(4) Patent Document 4: JP-A-8-278491

[Disclosure of the Invention]

An object of the present invention is to provide a thin liquid crystal film that does not cause appearance abnormalities such as cracks in a liquid crystal alignment layer even in severe environmental tests such as a cycle test of a high temperature test and a high temperature and high humidity test.

As a result of earnest research on the above problems, the present inventors have completed the present invention.

That is, the first aspect of the present invention is a liquid crystal film in which a cured acrylic resin layer and a fixed orientation of a liquid crystal material layer and a Z cured acrylic resin layer are laminated in this order, and at least one cured acrylic resin layer is formed. The resin layer has a glass transition temperature (T g) of 50 ° C. or higher and 200 ° C. or lower.

A second aspect of the present invention is a liquid crystal film in which a cured acryl-based resin layer Z-aligned liquid crystal material layer Z-cured acryl-based resin layer is laminated in this order, and the Tg of one cured acryl-based resin layer is The present invention relates to a liquid crystal film having a temperature of 50 ° C. or more and 200 ° C. or less and a Tg of another cured acrylic resin layer of 20 ° C. or more and 100 ° C. or less.

The third aspect of the present invention is a liquid crystal film obtained by laminating a cured acryl-based resin layer, a liquid crystal substance layer having a fixed Z-orientation, a Z-cured acryl-based resin layer, and a Z-transparent substrate film. The glass transition temperature (T g) of the acrylic resin layer is from 50 ° C to 200 ° C.

The fourth aspect of the present invention is a cured acrylic resin layer / a liquid crystal material layer having a fixed Z orientation / A liquid crystal film formed by laminating a cured acryl resin layer / translucent substrate film in this order, and the T g of one cured acryl resin layer is not less than 50 ° C and not more than 200 ° C, The present invention relates to a liquid crystal film, wherein one cured acryl-based resin layer has a T g of 20 ° C. or more and 100 ° C. or less.

According to a fifth aspect of the present invention, the liquid crystal material layer having a fixed orientation is composed of a polymer liquid crystal material that aligns liquid crystal at a temperature equal to or higher than the liquid crystal transition point and enters a glass state at a temperature equal to or lower than the liquid crystal transition point. It is related with the above-mentioned liquid crystal film.

According to a sixth aspect of the present invention, there is provided the liquid crystal film according to the above, wherein the liquid crystal material layer in which the alignment is fixed is obtained by photo-crosslinking or heat-crosslinking a low-molecular liquid crystal material having liquid crystal alignment.

The seventh aspect of the present invention relates to the liquid crystal film as described above, wherein the translucent substrate film is a triacetyl cellulose (T A C) film.

An eighth aspect of the present invention relates to the liquid crystal film as described above, wherein the translucent substrate film is a triacetyl cellulose (T A C) film having a thickness of 50 μm or less.

Furthermore, a ninth aspect of the present invention relates to a laminated film for an optical element, characterized in that the liquid crystal film described above is laminated with a polarizing film via an adhesive. In the above description, “Z” represents the interface of each layer, and the same shall apply hereinafter. Hereinafter, the present invention will be described in detail.

In the first aspect of the present invention, the liquid crystal film formed by laminating the cured acryl-based resin layer Z-aligned liquid crystal material layer and the cured acryl-based resin layer in this order is a photo-curing liquid crystal material layer formed on the alignment substrate. It can be obtained by transferring onto a re-peelable substrate via a type acrylic adhesive, and then forming a protective layer made of a cured acryl resin on the surface of the liquid crystal material layer from which the alignment substrate has been removed. The liquid crystal material layer in which the alignment of the liquid crystal used in the present invention is fixed is a layer fixed by using means for fixing the liquid crystal material in the aligned state. As a means of fixing the orientation of the liquid crystal, in the case of a polymer liquid crystal substance, the liquid crystal material is cooled rapidly from the orientation state and the gas is Examples include a method of fixing in a glassy state, a method of aligning a low-molecular liquid crystal substance or a high-molecular liquid crystal substance having a reactive functional group, and then reacting the functional group (curing, stretching, etc.) and fixing. It is done.

Examples of the reactive functional group include a bur group, a (meth) acryloyl group, a buroxy group, an epoxy group, an oxetanyl group, a carboxyl group, a hydroxyl group, an amino group, an isocyanato group, and an acid anhydride. The reaction is carried out in a suitable way.

The liquid crystal material that can be used for 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 of the liquid crystal film. Molecular liquid crystal materials are preferred. Furthermore, the molecular shape of the liquid crystal substance may be a rod shape or a disk shape. For example, a discotic liquid crystal compound exhibiting a discotic nematic liquid crystal property can also be used.

Examples of the liquid crystal phase of the liquid crystal material layer before fixation 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 substance, various main chain polymer liquid crystal substances, side chain polymer liquid crystal substances, or a mixture thereof can be used.

Main chain polymer liquid crystal materials include polyester, polyamide, polycarbonate, polyimide, polyurethane, polybenzimidazole, polybenzoxazole, polybenzthiazole, polyazomethine, polyester. Examples thereof include polymer liquid crystal materials such as amide, polyester carbonate and polyester imide, or a mixture thereof.

In addition, as the side chain type polymer liquid crystal substance, a skeleton chain having a linear or cyclic structure such as a polyacrylate type, a polymethacrylate type, a polybule type, a polysiloxane type, a polyether type, a polymalonate type, or a polyester type is used. Examples thereof include a polymer liquid crystal substance in which a mesogen group is bonded as a side chain to a substance having a substance, or a mixture thereof.

Of these, a main chain type polymer liquid crystal substance is preferred because of its ease of synthesis and orientation.

Low molecular liquid crystal materials include saturated benzene carboxylic acids, unsaturated benzene carboxylic acids, biphenyl carboxylic acids, aromatic oxycarboxylic acids, Schiff base types, Bisazomethine compounds, azo compounds, azoxy compounds, sylclohexane ester compounds, sterol compounds, etc. having the above-mentioned reactive functional group introduced at the terminal, liquid crystal compounds and liquid crystals among the above compounds Examples thereof include a composition obtained by adding a crosslinkable compound to a compound exhibiting properties.

Examples of the discotic liquid crystal compound include triphenylene and torquesen.

Furthermore, various compounds having functional groups or sites that can react by heat or a photocrosslinking reaction or the like in the liquid crystal substance may be blended within a range that does not hinder the expression of liquid crystallinity. Examples of the functional group capable of undergoing a crosslinking reaction include the various reactive functional groups described above. The liquid crystal material layer in which the alignment of the liquid crystal is fixed is a method in which a composition containing the liquid crystal material and various compounds added as necessary is applied on the alignment S plate in a molten state, Formed by the method of applying the solution on the alignment substrate, etc., and the coating applied on the alignment substrate is dried, subjected to heat treatment (liquid crystal alignment), and if necessary, light irradiation or heat treatment (polymerization, crosslinking) It is formed by fixing the orientation using the means for fixing the above-mentioned orientation.

The solvent used for the preparation of the solution is not particularly limited as long as it is a solvent that can dissolve the liquid crystal substance and composition used in the present invention and can be distilled off under appropriate conditions. Generally, acetone, methyl ethyl ketone are used. , Ketones such as isophorone, butenosyl alcohol, hexyloxyethyl alcohol, methoxyl 2-propanol, etc., ethylene glycol / resin chinenoyl ether, and glycol ethers such as diethylene glycol dimethyl ether , Esters such as ethyl acetate, methoxypropyl acetate, and ethyl lactate, phenols such as phenol and black mouth phenol, N, N-dimethylformamide, N, N-dimethylacetamide, N-methylpyrrolidone, etc. Midoids, black mouth form, tetrachrome Ethanone down, halogenated hydrocarbons such or a mixture of these systems, such as Axis every mouth benzene is used properly preferred. Further, in order to form a uniform coating film on the alignment substrate, a surfactant, an antifoaming agent, a leveling agent, etc. may be added to the solution. Furthermore, dichroic dyes, ordinary dyes, pigments, and the like can be added within a range that does not hinder the expression of liquid crystallinity for the purpose of coloring.

The application method is not particularly limited as long as the uniformity of the coating film is ensured. A known method can be employed. Examples thereof include a roll coating method, a dip coating method, a dip coating method, a curtain coating method, and a spin coating method. After application, a solvent removal (drying) step by a method such as a heater or hot air blowing may be added. The thickness of the applied film in the dry state is from 0.1 / zm to 50 / m, preferably from 0.2 μπι to 20 / πι, and more preferably from 0.3 μπ! ~ 10 μm. Outside this range, the optical performance of the obtained liquid crystal material layer is insufficient, and the alignment of the liquid crystal material is insufficient.

Subsequently, if necessary, the orientation of the liquid crystal is formed by heat treatment or the like, and then the orientation is fixed. The heat treatment is to align the liquid crystal by the self-orientation ability inherent in the liquid crystal substance by heating to the temperature range where the liquid crystal phase appears. The conditions for the heat treatment cannot be generally stated because the optimum conditions and limit values differ 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 It is in the range of 2 50 ° 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 decompose or adversely affect the alignment substrate. The heat treatment time is usually in the range of 3 seconds to 60 minutes, preferably 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 exceeds 60 minutes, the productivity will be 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 means suitable for the liquid crystal material used.

Examples of the alignment substrate include polyimide, polyamide, polyimide, polyphenylene sulfide, polyphenylene oxide, polyether ketone, polyether ether ether ketone, polyether ether sulfone, polysulfone, polyethylene terephthalate, polyethylene naphthalate, and polyarylate. Examples thereof include films of triacetyl cellulose, epoxy resin, phenol resin and the like.

Some of these films exhibit sufficient alignment ability for the liquid crystal material used in the present invention without performing treatment for expressing the alignment ability again depending on the production method, but the alignment ability is insufficient, or When the orientation ability is not exhibited, these films are stretched under moderate heating, the film surface is rubbed in one direction with rayon cloth, etc., so-called rubbing treatment, polyimide, polyvinyl alcohol on the film , Shi Use a film that exhibits alignment ability by providing an alignment film made of a known alignment agent such as a run force pulling agent and performing rubbing treatment, oblique vapor deposition treatment such as silicon oxide, or a combination of these. May be.

Also, as the alignment substrate, a metal plate such as aluminum, iron, or copper having various regular fine grooves on the surface, various glass plates, etc. can be used.

Here, the alignment treatment direction of the alignment substrate is not particularly limited, and can be appropriately selected by performing each of the above treatments in an arbitrary direction. In particular, when a liquid crystal film formed on a long alignment substrate is used, a predetermined angle is selected with respect to the MD direction of the long continuous film, and an alignment process is performed in an oblique direction as necessary. It is desirable. By laminating the liquid crystal film in an axial arrangement that allows optimal optical characteristics to be achieved by aligning the film in a predetermined angle direction, bonding in a state where the MD of the long film is aligned (so-called roll-to-roll This is extremely advantageous in that it can be bonded) or the efficiency of product collection increases. Next, a method for transferring the liquid crystal material layer formed on the alignment substrate onto the removable substrate will be described.

Examples of the removable substrate used in the present invention include polyethylene, polypropylene, 4-methylpentene_1 resin and other olefin-based resins, polyamides, polyimides, polyamideimides, polyetherimides, polyether ketones, polyether ether-tenol ketones, Polyethersulfone, Polyketonesulfide, Polysulfone, Polystyrene, Polyphenylene sulfide, Polyethylene oxide, Polyethylene terephthalate, Polybutylene terephthalate, Polyarylate, Polyacetal, Uniaxially stretched polyester, Polycarbonate, Polyvinyl alcohol, Polymethyl methacrylate, polyarylate, amorphous polyolefin, norbornene resin, triacetyl cellulose, or epoxy resin Phil beam can be used.

In particular, transparent and optically isotropic films with excellent optical defect inspection properties include 4-methylpentene-1, polymethyl methacrylate, polystyrene, polycarbonate, polyethersulfone, polyarylate, and amorphous poly Olefin, norbornene resin, triacetyl selellellose, or epoxy A plastic film such as a resin is preferably used.

In order to give these plastic films appropriate removability, the surface can be coated with silicone in advance, or an organic thin film or an inorganic thin film can be formed. For the same purpose, the surface of the plastic film can be subjected to chemical treatment such as saponification treatment or physical treatment such as corona treatment.

Further, in order to adjust the peelability of the releasable substrate, the plastic film may contain a lubricant or a surface modifier. There are no particular limitations on the type and amount of the lubricant as long as it does not adversely affect the inspection and releasability of optical defects. Specific examples of the lubricant include fine silica, fine alumina, and the like. As an indicator of the amount of addition, the haze value of the removable substrate is usually 50% or less, preferably 30% or less. Good. If the addition amount is too small, the effect of addition is not recognized. On the other hand, if the addition amount is too large, the optical defect inspection property deteriorates, which is not preferable.

Further, if necessary, other known various additives such as a blocking inhibitor, an antioxidant, an antistatic agent, a heat stabilizer, and an impact resistance improving agent may be contained. Regarding the peelability of a removable substrate, even a releasable substrate manufactured from the same material cannot be determined unconditionally because it changes depending on the manufacturing method, surface condition, wettability with the adhesive used, etc. However, the peeling force at the interface with the adhesive (1800 ° peeling, peeling speed 30 cm, measured at room temperature) is usually 0.38 to: I 2 N / m, preferably 0. 3 8 to 8.0 NZm is desirable. If the peel force is lower than this value, the peel-off force is too low when the alignment substrate is peeled off after the liquid crystal material layer on the alignment substrate is bonded to the re-release substrate. If the desired peeling state at the desired interface is not obtained, the transfer of the liquid crystal material layer to the removable substrate becomes insufficient, and if the peeling force is too high, the removable substrate is peeled off. At this time, it is not preferable because the liquid crystal material layer is broken or it cannot be peeled off at the interface with the desired layer.

Also, the thickness of the removable substrate may affect the releasability, and is preferably 16 to 100 im, particularly preferably 25 to 50 μm. If the thickness is too thick, the peeling point may not be stable and the peelability may deteriorate. On the other hand, if the thickness is too thin, the mechanical strength of the film cannot be maintained, which may cause problems such as tearing during production. . In order to transfer the liquid crystal material layer formed on the alignment substrate onto the re-peelable substrate as described above, a photocurable acrylic adhesive is applied to the liquid crystal material layer and then irradiated from the outside. After photo-curing and bonding, the alignment substrate can be peeled off to transfer easily. The cured acrylic resin layer as an adhesive is formed by applying a curable acrylate and curing it.

As the curable acrylate used, for example, a known photo-curable acryl-based adhesive can be used. For example, polyester acrylate, epoxy acrylate, urethane acrylate, polyether acrylate, silicone acrylate Examples thereof include various acryl-based oligomers and monomers such as a monomer alone, a mixture thereof, or a mixture of these with various reactive diluents.

In addition, various fine particles and surface modifiers can be added to these adhesives as long as the properties are not impaired.

Examples of the fine particles include fine particles having a refractive index different from that of the compound constituting the adhesive, conductive fine particles for improving antistatic performance without impairing transparency, and fine particles for improving wear resistance. Specific examples include fine silica, fine alumina, ITO (Indium Tin Oxide) fine particles, silver fine particles, and various synthetic resin fine particles.

Further, the surface modifier is not particularly limited as long as it has good compatibility with the adhesive and does not affect the curability of the adhesive or the optical performance after curing, and is ionic or nonionic. Water-soluble surfactants, oil-soluble surfactants, polymer surfactants, fluorine-based surfactants, organometallic surfactants such as silicone, reactive surfactants, and the like can be used.

The curing method of these curable acryl adhesives is not particularly limited, and examples thereof include heat curing, redox system room temperature curing, anaerobic curing, actinic radiation curing such as ultraviolet rays and electron beams. A preferred curing method is a photocuring method using active rays such as ultraviolet rays and electron beams. The photocuring method is preferable because it generates little or no heat and thus has little influence on the liquid crystal substance layer in which the alignment is fixed. The reaction is performed by adding various known photoinitiators and irradiating light from a light source such as a metal halide lamp, high-pressure mercury lamp, low-pressure mercury lamp, xenon lamp, arc lamp, laser beam, or synchrotron radiation source. be able to. The amount of irradiation per unit area (1 square centimeter) is usually in the range of l to 2 0 0 0 mj, preferably 1 to 1 0 0 0 0 m j as the integrated dose It is. However, this is not the case when the absorption region of the photoinitiator and the spectrum of the light source are significantly different, or when the reactive compound itself has the ability to absorb the light source wavelength. In these cases, an appropriate photosensitizer, or a mixture of two or more photoinitiators having different absorption wavelengths can be used. The acceleration voltage in the case of the electron beam curing type is usually 10 kV to 200 kV, and preferably 50 kV to 100 kV.

Examples of the photocuring initiator in the case of curing with actinic radiation include, for example, benzoin etherenole, benzoin ethylenoate / res, benzino methinoreketanol, hydroxyphenyl ketone, 1,1-dichloroacetophenol. Non-, thixanthones, or benzophenones in combination with amines are exemplified. The amount used is in the range of 0.1 to: I 0% by weight of the resin. Next, a protective layer made of a cured acrylic resin is formed on the liquid crystal material layer from which the alignment substrate has been removed in order to protect the surface. The protective layer may be a cured acryl-based resin layer itself made of a curable acrylate having optical isotropy, or by adhering a translucent film using a curable acryl resin as an adhesive. Can be configured. In either case, the cured acryl resin layer is formed by applying a curable acrylate to the surface and curing it.

As the curable acrylate used for forming the protective layer, those known as an acrylic adhesive, a curable plastic coating agent, or a plastic hard coat agent can be used. For example, polyester acrylate, epoxy acrylate, urethane acrylate. Examples thereof include various acryl-based oligomers and monomers such as rate, polyether acrylate, and silicone acrylate, mixtures thereof, and mixtures thereof with various reactive diluents.

Examples of the fine particles include fine particles having a refractive index different from that of the compound constituting the adhesive, conductive fine particles for improving antistatic performance without impairing transparency, and fine particles for improving wear resistance. Specific examples include fine silica, fine alumina, ITO (Indium Tin Oxide) fine particles, silver fine particles, and various synthetic resin fine particles. The surface modifier is not particularly limited as long as it has good compatibility with the adhesive and does not affect the curability of the adhesive or the optical performance after curing. Water-soluble surfactants, oil-soluble surfactants, polymer surfactants, fluorosurfactants, organometallic surfactants such as silicone, reactive surfactants, and the like can be used.

The curing method of these curable acrylic resins is not particularly limited, and examples thereof include heat curing, redox room temperature curing, anaerobic curing, active ray curing such as ultraviolet rays and electron beams. A preferable curing method is a photo-curing method using an active ray such as an ultraviolet ray or an electron beam. The photocuring method is preferable because it generates little or no heat and thus has little influence on the liquid crystal substance layer in which the alignment is fixed. The reaction can be performed by adding various known photoinitiators and irradiating light from a light source such as a metal halide lamp, a high-pressure mercury lamp, a low-pressure mercury lamp, a xenon lamp, an arc lamp, a laser, or a synchrotron radiation source. The irradiation dose per unit area (1 square centimeter) is usually in the range of 1 to 200,000 mj, preferably 10 to 100 OmJ, as the integrated irradiation dose. However, this is not the case when the absorption region of the photoinitiator and the spectrum of the light source are significantly different, or when the reactive compound itself has the ability to absorb the light source wavelength. In these cases, an appropriate photosensitizer, or a mixture of two or more photoinitiators having different absorption wavelengths can be used. The acceleration voltage in the case of the electron beam curing type is usually 10 kV to 200 kV, and preferably 50 kV to 100 kV.

Examples of the photocuring initiator in the case of curing with actinic radiation include, for example, benzoin ether, benzoin ether, benzylmethyl ketal, hydroxyphenyl ketone, 1,1-dichloroacetophenone, thixanthones, or Examples include benzophenones in combination with amines. The amount of resin used is 0. A range of ˜10% by weight is employed.

By the above-described method, a liquid crystal film in which a cured acryl-based resin layer / a liquid crystal material layer in which an orientation is fixed and a cured acryl-based resin layer are laminated in this order is obtained. The re-peelable substrate is peeled off before forming the protective layer or after forming the protective layer. Here, in the present invention, the above-mentioned cured acrylic resin layer (A) liquid in which no orientation is fixed Among the liquid crystal films in which the crystal material layer and the cured acrylic resin layer (B) are laminated in this order, at least one cured acrylic resin layer has a glass transition temperature (Tg) of 50 ° C or higher 200 Use a temperature not higher than ° C, preferably not lower than 60 ° C and not higher than 1550 ° C. If the Tg of the cured acryl resin layer is lower than 50 ° C, abnormal appearance (cracking, deformation, etc.) of the liquid crystal material layer in environmental tests such as high temperature and high humidity, especially in cyclic environmental tests between high temperature and high humidity The effect of preventing is insufficient. On the other hand, if the glass transition temperature is higher than 200 ° C, problems such as insufficient adhesion to the liquid crystal material layer and cracks in the cured acrylic resin layer are likely to occur. In addition, if both Tg of the cured acryl-based resin layers (A, B) are too high, problems such as cracking at the edges are likely to occur during film cutting and handling. The Tg of the cured acrylic resin layer is 50 ° C to 200 ° C, and the Tg of the other cured acrylic resin layer is 20 ° C to 100 ° C, preferably 30 ° C or more. It is preferably 80 ° C or lower.

The thicknesses of the cured acrylic resin layers (A, B) are each 0.1 to 50 μπι, preferably 0.5 to 20 μηι, and more preferably 1 to I 0 μm. . If the thickness is too thin, the protective effect of the liquid crystal material layer in the environmental test is insufficient, and if it is too thick, it takes time to cure the acrylic resin layer, and the product thickness becomes unfavorable. In the present invention, a release layer is formed between the liquid crystal substance layer and another layer by using a releasable substrate in which a release layer that can be peeled from the substrate is formed on the surface of the releasable substrate. It is also possible to form. By forming the release layer, it is possible to obtain a stress blocking effect to suppress the appearance change (for example, wave out) of the thin film liquid crystal material layer during manufacturing and environmental testing. Here, the release layer is not particularly limited, but is preferably an optically isotropic transparent layer. Examples thereof include polymers such as acrylic, methacrylic, nitrocellulose, and epoxy compounds, and mixtures thereof. be able to. The thickness of the release layer is 0.3 μm or more and 40 μm or less, preferably 0.5 μm or more and 10 m or less, and the glass transition point (T g) is 20 ° C. or more, preferably 50 The material is not particularly limited as long as it is an optically isotropic transparent layer at a temperature of ° C or more and does not significantly impair the optical properties of the liquid crystal material layer. If the film thickness and glass transition point are outside this range, Is not preferred from the standpoints of lack of effectiveness and the product becoming too thick. The release layer may be controlled in physical properties by partial crosslinking by adding a crosslinking component, addition of a plasticizer, addition of a lubricant, and the like.

Furthermore, the method for forming the release layer is not particularly limited. For example, a material that becomes the release layer having the above-described film thickness is applied on a removable substrate film such as polyethylene, polypropylene, and polyethylene terephthalate. Examples thereof include a transfer method in which the layer is formed by a method such as extrusion, this layer is closely adhered via an adhesive layer or a transparent protective layer, and then the removable substrate film is peeled off. In the third aspect of the present invention, the cured acryl-based resin layer is a liquid crystal material layered in the order of a liquid crystal material layer with fixed orientation / cured acryl-based resin layer / translucent substrate film. The layer is transferred onto a light-transmitting substrate film through a photocurable acryl-based adhesive, and then a protective layer made of cured allyl resin is formed on the surface of the liquid crystal material layer from which the alignment substrate has been removed. Can do. The translucent substrate film used in the present invention is not particularly limited as long as it has transparency, optical isotropy, and can support the liquid crystal material layer, but a plastic film is usually used. For example, polyarylates such as polymethyl (meth) acrylate, polystyrene, polycarbonate, polyethersulfone, polyphenylene sulfide, polyarylate, polyethylene sulfide, amorphous polyolefin, triacetyl cellulose, 4-methylpentene-1, Examples of such films include norbornene-based resins and epoxy resins.

The translucent substrate film is usually selected from the range of 1 to 100 μm because the self-supporting property or the supporting property is lost if there is no certain thickness.

In order to increase the resistance of the liquid crystal film in the environmental test, it is desirable to use a light-transmitting substrate film such as polycarbonate that has less shrinkage change due to moisture absorption under the environmental test conditions. On the other hand, a triacetyl cellulose (TAC) film is often used because of its excellent optical properties and versatility. When using a TAC film as a translucent substrate film, it is necessary to reduce the thickness of the final product. In addition, in order to suppress the change in shrinkage of the TAC film under environmental test conditions as much as possible, the thickness should be 100 m or less, preferably 50 μm or less.

As a method for transferring the liquid crystal material layer formed on the alignment substrate onto the translucent substrate film, the liquid crystal material layer is photocured in the same manner as the method for transferring the liquid crystal material layer onto the removable substrate described above. A method of transferring to a translucent substrate film through a type acrylic adhesive can be used.

That is, after the translucent substrate film is bonded to the liquid crystal material layer with a photo-curable acrylic adhesive, it is photocured by irradiating it with light from the outside, bonded, and then the alignment substrate is peeled off for easy transfer. Is possible.

As the curable acrylate used as the adhesive, a known photo-curing acryl adhesive as described above can be used. In addition, as described above, various fine particles and surface modifiers can be added to these adhesives as long as the properties are not impaired. In addition, the above-described method is used for curing these curable acryl-based resins.

Next, a protective layer made of a cured acrylic resin is formed on the liquid crystal material layer from which the alignment substrate has been removed in order to protect the surface. The protective layer can be a cured acryl-based resin layer itself made of a curable acrylate having optical isotropy, or a light-transmitting film can be bonded using the curable acryl resin as an adhesive. Can also be configured. In both cases, the cured acryl resin layer is formed by applying a curable acrylate to the surface and curing it.

As the curable acrylate used for forming the protective layer, those known as acrylic adhesives, curable plastic coating agents, or plastic hard coating agents as described above can be used. As described above, various fine particles and surface modifiers can be added to these adhesives as long as the properties are not impaired. In addition, the above-described method is used for curing these curable acryl-based resins.

By the above method, a liquid crystal film in which the liquid crystal material layer / cured acrylic resin layer Z light-transmitting substrate film in which the cured acryl-based resin layer Z orientation is fixed is laminated in this order is obtained. In the present invention, the above-mentioned cured acrylic resin layer (A) liquid crystal material layer in which the orientation is fixed Z cured acrylic resin layer (B) Z is a liquid crystal film in which a Z-transparent substrate film is laminated in this order. Of these, at least one cured acrylic resin layer having a glass transition temperature (Tg) of 50 ° C to 200 ° C, preferably 60 ° C to 150 ° C is used. If the Tg of the cured acrylic resin layer is lower than 50 ° C, abnormal appearance of the liquid crystal material layer (cracking, deformation, etc.) in environmental tests such as high temperature and high humidity, especially in cyclic environmental tests between high temperature and high humidity ) The effect of preventing is insufficient. On the other hand, if the glass transition temperature is higher than 200 ° C, problems such as insufficient adhesion to the liquid crystal material layer and easy cracking in the cured acrylic resin layer occur. In addition, if both Tg of the hardened acrylic resin layers (A, B) are too high, problems such as cracking at the end during film handling are likely to occur. Tg of one cured acrylic resin layer is 50 ° C or more and 200 ° C or less, and Tg of another cured acrylic resin layer is 20 ° C or more and 100 ° C or less, preferably 30 ° C or more The temperature is preferably 80 ° C or lower.

Further, the thickness of the cured acrylic resin layer (A, B) is 0.1 to 50 m, preferably 0.5 to 20 μπι, more preferably: ~ 10 m. If the thickness is too thin, the protective effect of the liquid crystal material layer in the environmental test is insufficient, and if it is too thick, it takes time for the acrylic resin layer to cure or the product thickness increases, which is not preferable. If necessary, the surface protection function can be increased by laminating a transparent protective film that is optically isotropic for surface protection of the surface of the cured acrylic resin layer. When a light-transmitting protective film is further bonded in this manner, the light-transmitting protective film is bonded by using a light-curable resin among the acrylic resins described above as the curable acrylate resin. After laminating the film, it can be cured by applying light from the outside.

The translucent protective film is appropriately selected from the materials described in the above translucent substrate and used. The translucent protective film has a thickness of 0.1 to 500 / im, preferably: The range is ~ 200 m. The liquid crystal film of the present invention is usually laminated with a polarizing plate when used as a color compensator for a liquid crystal display element or a viewing angle compensator, and further, as necessary, a liquid crystal film or a polymer. A stretched film or the like is also laminated. Here, also in lamination | stacking of a polarizing plate, a liquid crystal film, a polymer stretched film, etc., it can laminate | stack via a well-known translucent adhesive agent. As a laminated body thus obtained, for example,

(1) Polarizing plate Z Adhesive layer Liquid crystal film

(2) Polarizing plate Adhesive layer / Polymer stretched film Z Adhesive layer Liquid crystal film

(3) Polarizing plate Z adhesive layer / liquid crystal film Z adhesive layer / liquid crystal film

(4) Polarizing plate Adhesive layer / liquid crystal film Adhesive layer Z polymer stretched film and the like. The polarizing plate is not particularly limited, and a polarizing plate usually used in a liquid crystal display device can be used as appropriate, but a thin film type that has been developed recently is preferable. Specifically, iodine and / or two colors are used for hydrophilic polymer films such as PVA polarizing films such as polybulal alcohol (PVA) and partially acetalized PVA, and partially saponified ethylene-vinyl acetate copolymers. For example, a polarizing film formed by adsorbing a photosensitive dye and stretched, or a polarizing film made of a polyene-oriented film such as a PVA dehydrated product or a polychlorinated butyl dehydrochlorinated product can be used. A reflective polarizing film can also be used.

The polarizing plate may be used alone, or a polarizing film may be provided with a transparent protective layer or the like on one or both sides of the polarizing film for the purpose of improving strength, improving moisture resistance, improving heat resistance, etc. good. As the transparent protective layer, a transparent plastic film such as polyester triacetylcellulose is laminated directly or via an adhesive layer, a resin coating layer, an acrylic or epoxy photocurable resin layer, etc. And so on. 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.

Examples of the stretched polymer film include cellulose-based, polycarbonate-based, polyarylate-based, polysulfone-based, polyvinyl alcohol (PVA) -based, polyacrylic-based, polyethersulfone-based, cyclic polyolefin-based uniaxial, Alternatively, a biaxially stretched retardation film can be exemplified. Above all, polycarbonate From the viewpoint of ease of production, film uniformity, and optical properties, cyclic polyolefin-based uniaxially stretched films such as a benzoyl-based and norbornene-based film are preferred.

Here, the direction of stretching is not particularly limited, and can be appropriately selected by performing in any direction. In particular, when handling a long polymer stretched film, it is stretched obliquely (obliquely stretched) or TD direction (transversely) at a predetermined angle with respect to the MD direction of the long continuous film. Stretching) It is desirable to be processed. When a stretched film is laminated with a liquid crystal film or polarizing plate in an axial arrangement that can exhibit optimal optical characteristics by stretching the film in a predetermined angle direction, it is applied in a state where the MD of the long film is aligned. This is extremely advantageous from the standpoint of enabling bonding (so-called roll-to-roll bonding) or increasing the efficiency of product collection. The optical laminate in which the liquid crystal film of the present invention is bonded to a polarizing plate functions as a compensation member for various liquid crystal display devices, an elliptically polarizing plate, and a circularly polarizing plate, depending on the optical parameters of the liquid crystal material layer. Can do.

That is, since the liquid crystal material layer constituting the optical laminate is, for example, a liquid crystal material layer in which nematic alignment or twisted nematic alignment is fixed functions as a retardation plate, the optical material of the present invention using the liquid crystal material layer as a constituent member. The laminated body can be used as a compensation plate for transmission or reflection type liquid crystal display devices such as STN type, TN type, OCB type, and HAN type.

In addition, the liquid crystal material layer in which the nematic hybrid alignment is fixed can be used as a retardation film or a wave plate when viewed from the front, and the orientation of the retardation value (film) By utilizing the asymmetry due to the inclination of the molecular axis in the thickness direction, it can also be used as a viewing angle improving member of a TN type liquid crystal display device. In addition, the liquid crystal material layer having a 1Z4 wavelength plate function can be used as an antireflection filter for a circularly polarizing plate, a reflective liquid crystal display device, or an EL display device by combining with a polarizing plate as in the present invention. it can. In particular, in order to obtain a broadband 14 wavelength plate that functions over a wide range in the visible light region, the phase difference of birefringent light in monochromatic light at 5500 nm is approximately 1/4 wavelength. Birefringent light with plate and monochromatic light at 5500 nm It is generally known that it is effective to stack 1 and 2 wavelength plates with a phase difference of approximately 1 Z 2 wavelengths in a state where their slow axes intersect. Widely used in liquid crystal display devices. That is, if a technique for obtaining a thin optical laminate as in the present invention is used, a thin broadband 14-wave plate that has been difficult with only a conventional high molecular stretched film can be obtained. Here, the retardation value of the 1/4 wavelength plate is usually 70 nm to 80 nm, preferably 90 nm to 160 nm, and particularly preferably 120 nm ηπ! It is in the range of ~ 1 5 0 n.rn. In addition, the retardation value of the 1-wave plate is usually from 1800 nm to 3200 nm, preferably 2 0 0 η π! ~ 300 nm, particularly preferably 2 2 O n π! It is in the range of ~ 280 nm. If the retardation range of the 1/4 wavelength plate and 1 Z 2 wavelength plate deviates from the above, unnecessary coloration may occur in the liquid crystal display device. The retardation value represents the product of birefringence Δn and film thickness d.

Further, in the optical layered body of the present invention, if the liquid crystal material layer constituting the layered body is one in which the cholesteric alignment is fixed to the smectic alignment, a polarizing reflection film for improving brightness, a reflection type color filter, selection It can be used for various anti-counterfeiting elements and decorative films that take advantage of the color change of reflected light depending on the viewing angle due to reflectivity.

[Industrial applicability]

According to the present invention, it is possible to obtain a thin laminated film for optical elements that has been improved in resistance under severe environmental tests that would cause appearance abnormalities, and therefore when used by being bonded to a liquid crystal display device. The industrial margin is extremely high.

[Best Mode for Carrying Out the Invention]

EXAMPLES Hereinafter, although an Example and a comparative example demonstrate this invention further in detail, this invention is not limited to these. Note that the retardation (product of birefringence Δn and film thickness d) in this example is a value at a wavelength of 5500 nm unless otherwise specified. Preparation Examples>

Terephthalic acid 50 mm o 1, 2, 6—Naphthalenedicarboxylic acid 50 mm o 1, methinohydroquinone diacetate 40 mm o 1, force teconoresicetate 60 m mo 1 and N-methylimidazole 6 Om g was used for polycondensation at 270 ° C for 12 hours in a nitrogen atmosphere. Next, the obtained reaction product was dissolved in tetrachloroethane, and then purified by reprecipitation with methanol to obtain 14.6 g of a liquid crystalline polyester. The logarithmic viscosity of this liquid crystalline polyester (Polymer 1) (phenol Z tetrachloroethane (64 mass ratio) mixed solvent: 30 ° C) is 0. ledl / g, it has a nematic phase as a liquid crystal phase, isotropic liquid crystal The phase transition temperature was 250 ° C or higher, and the glass transition temperature by differential scanning calorimetry (DS C) was 1 1 2 ° C.

A solution was prepared by dissolving 20 g of Polymer 1 in 80 g of N-methyl-2-pyrrolidone. This solution was applied on a polyimide film (trade name “Kapton”, manufactured by DuPont) that was rubbed with a rayon cloth, and the solvent was removed by drying, followed by heat treatment at 210 ° C for 20 minutes. As a result, a nematic alignment structure was formed. After the heat treatment, the nematic alignment structure was fixed by cooling to room temperature to obtain a liquid crystal material layer uniformly aligned with an actual film thickness of 0.7 μπι on the polyimide film (liquid crystal material layer 1). The actual film thickness was measured using a stylus type film thickness meter.

A UV curable acrylic adhesive with a glass transition temperature of 105 ° C on the liquid crystal material layer 1 (surface opposite to the polyimide film) obtained in the preparation example to a thickness of 5 zm. The layer 1 was applied, and a polyethylene terephthalate (PET) film 1 having a thickness of 50 μπι was laminated thereon, and the acrylic resin layer 1 was cured by UV irradiation of about 60 Om J. After this, the PET film 1 cured acrylic resin layer 1 Z liquid crystal material layer 1 The polyimide film is peeled from the laminate in which the polyimide film is integrated to transfer the liquid crystal material layer onto the PET film 1, and PE

A laminate comprising a T film, a 1Z cured acryl-based resin layer, and a 1 liquid crystal material layer was obtained. Further, a UV curable acryl-based adhesive having a Tg = 110 ° C. was applied as a acryl-based resin layer 2 to a thickness of 5 jum on the liquid crystal material layer 1 of the laminate, and the thickness was further increased. 38 A μm polyethylene terephthalate (PET) film 2 was laminated, and the acrylic resin layer 2 was cured by UV irradiation of about 60 Om J. By peeling the PET film 2 from this laminate, a laminate (A) comprising PET film 1 cured acrylic resin layer 1 / liquid crystal material layer 1Z cured acrylic resin layer 2 was obtained. Here, Δ nd of the laminate after peeling the PET film 1 from the laminate (A) is 145 nm.

A commercially available uniaxially stretched norbornene film (thickness 80 μm, A nd 270 nm) in which a pressure-sensitive adhesive layer having a thickness of 25 ^ m is previously formed on one side of the cured acrylic resin layer 2 of the laminate (A). JSR Co., Ltd. Arteron) is bonded to obtain a laminate composed of a norbornene film adhesive layer, a cured acrylic resin layer, a 2 liquid crystal material layer, a cured acrylic resin layer 1 and a PET film 1 It was.

In addition, a commercially available polarizing plate (thickness: about 180 m; SQW-862 manufactured by Sumitomo Chemical Co., Ltd.) with a 25 μπι thick adhesive layer formed on one side in advance is bonded, and finally PET film 1 is peeled off. Thus, a laminated film for an optical element according to the present invention comprising a polarizing plate / adhesive layer nonorbornene-based film non-adhesive layer / cured acryl-based resin layer 2 Z liquid crystal material layer 1 Z-cured acryl-based resin layer 1 was obtained. .

A laminated film for an optical element was obtained in the same manner as in Example 1 except that an adhesive having a T g of 54 ° C. was used as the UV curable acrylic resin layer 1.

Example 1 except that an adhesive of T g = 10 08 ° C was used as the UV curable acrylic resin layer 1 and an adhesive of T g = 62 ° C was used as the UV curable acrylic resin layer 2. In the same manner as above, a laminated film for optical elements was obtained. Comparative Example 1>

A laminated film for an optical element was obtained in the same manner as in Example 1 except that an adhesive having a T g of 41 ° C. was used as the UV curable acryl resin layers 1 and 2. Comparative Example 2>

Example 1 except that an adhesive of T g = 41 ° C was used as the UV curable acrylic resin layer 1 and an adhesive of T g = 224 ° C was used as the UV curable acrylic resin layer 2. In the same manner as above, a laminated film for optical elements was obtained. Comparative Example 3>

A laminated film for an optical element was obtained in the same manner as in Example 1 except that an adhesive having a T g of 224 ° C was used as the UV-curable acryl resin layers 1 and 2.

A UV-curable acrylic adhesive with a glass transition temperature of 85 ° C on the liquid crystal material layer 1 (surface opposite to the polyimide film) obtained in the preparation example is 5; The resin layer 3 was applied, and a 40 _μm- thick triacetyl cellulose (TAC) film was laminated thereon, and the acrylic resin layer 3 was cured by UV irradiation of about 60 Om J. After this, the polyimide film is peeled from the laminate in which the TAC film-cured acrylic resin layer 3 Z liquid crystal material layer 1 / polyimide film is integrated to transfer the liquid crystal material layer onto the TAC film. A laminate comprising a TAC film cured acryl-based resin layer 3 and a liquid crystal material layer 1 was obtained.

Further, a UV curable acryl adhesive of T g = 110 ° C is applied on the liquid crystal material layer 1 of the laminate (the surface opposite to the TAC film) to a thickness of 5 μπι. 4 and a polyethylene terephthalate (PET) film having a thickness of 38 μm was laminated thereon, and the acrylic resin layer 4 was cured by UV irradiation of about 60 Om J. By peeling the PET film from this laminate, a laminate (A) comprising TAC film / cured acryl resin layer 3 Z liquid crystal material layer 1 cured acryl resin layer 4 was obtained. Here, Δnd of the laminate (A) was 140 nm. Commercially available uniaxially stretched norbornene film (thickness 80 μm, A nd 2 75 nm) in which a pressure-sensitive adhesive layer having a thickness of 25 m is formed on one side in advance on the surface of the cured acrylic resin layer 4 of the laminate (A). JSR Co., Ltd. Arton) is bonded to obtain a laminate composed of norbornene film adhesive layer Z cured acryl resin layer 4 Z liquid crystal material layer 1Z cured attaryl resin layer 3 ZT AC film It was. Further, by sticking a commercially available polarizing plate (thickness: about 180 μπι; SQW-862, manufactured by Sumitomo Chemical Co., Ltd.) having a 25 μm thick adhesive layer formed on one side in advance, the polarizing plate adhesive layer 偏光板A laminated film for optical elements of the present invention comprising a norbornene-based film, an adhesive layer, a cured acryl-based resin layer, a ζ liquid crystal material layer, a 1Z-cured acryl-based resin layer, and a ZT AC film was obtained.

A laminated film for an optical element was obtained in exactly the same manner as in Example 4, except that an adhesive having a T g of 41 ° C. was used as the UV curable acryl-based resin layer 3.

Except for using UV-curable acrylic resin layer 3 with an adhesive of T g = 10 07 ° C and UV-curable acrylic resin layer 4 with an adhesive of T g = 4 1 ° C. In the same manner as in No. 4, a laminated film for optical elements was obtained.

A laminated film for an optical element was obtained in the same manner as in Example 5 except that an adhesive having a T g of 41 ° C. was used as the UV curable acryl-based resin layer 4.

A laminated film for an optical element was obtained in the same manner as in Example 4 except that an adhesive having a T g of 224 ° C was used as the UV curable acryl-based resin layer 4. Table 1 summarizes the evaluation results of the high-temperature and high-humidity cycle environmental tests of the laminated films for optical elements obtained in Examples 1 to 3 and Comparative Examples 1 to 3. Table 2 summarizes the evaluation results of the high-temperature and high-humidity cycle environmental tests of the laminated films for optical elements obtained in Examples 4 to 6 and Comparative Examples 4 to 5. Here, the cycle environment test conditions were (1) 24 hours at 80 ° C dry and (2) 30 cycles of cycle test at 60 ° C 90% RH for 24 hours. Further, as test forms, Examples 1 to 3 and Comparative Examples 1 to 3 are acrylic resins of the obtained laminated film for optical elements. It was carried out in a form in which the surface of layer 1 was bonded to a soda glass having a thickness of 2 mm via an adhesive having a thickness of 25 / zm, and Examples 4 to 6 and Comparative Examples 4 to 5 were obtained. The TAC film surface of the optical element laminated film was bonded to a 2 mm thick soda glass through a 25 μm thick adhesive.

table 1

Table 2

Claims

The scope of the claims

1. Cured acrylic resin layer Liquid crystal material layer in which orientation is fixed A liquid crystal film laminated in the order of a cured acrylic resin layer, wherein the glass transition temperature (T g) of at least one cured acrylic resin layer is A liquid crystal film characterized by being 50 ° C or higher and 200 ° C or lower.

2. Cured acrylic resin layer / Liquid crystal material layer with fixed orientation Z A liquid crystal film in which the cured acrylic resin layer is laminated in this order, and the Tg of the cured acrylic resin layer is 50 ° C. A liquid crystal film having a temperature of 200 ° C or lower and a Tg of another cured acryl-based resin layer of 20 ° C or higher and 100 ° C or lower.

3. Cured acrylic resin layer Liquid crystal material layer in which orientation is fixed A liquid crystal film in which a cured acrylic resin layer / translucent substrate film are laminated in this order, comprising at least one cured acrylic resin layer glass A liquid crystal film having a transition temperature (T g) of 50 ° C or higher and 200 ° C or lower.

4. Cured acrylic resin layer A liquid crystal film in which a Z-alignment fixed liquid crystal material layer / cured acrylic resin layer / translucent substrate film is laminated in this order, and the Tg of one cured acrylic resin layer A liquid crystal film characterized by having a Tg of not less than 50 ° C and not more than 200 ° C, and the Tg of another cured acryl-based resin layer being not less than 20 ° C and not more than 100 ° C.

5. The liquid crystal material layer in which the alignment is fixed is composed of a polymer liquid crystal material that aligns liquid crystal at a temperature equal to or higher than the liquid crystal transition point and enters a glass state at a temperature equal to or lower than the liquid crystal transition point. 5. The liquid crystal film according to any one of items 4.

6. The liquid crystal film according to any one of items 1 to 4, wherein the liquid crystal material layer in which the alignment is fixed is obtained by photo-crosslinking or heat-crosslinking a liquid crystal-aligned low-molecular liquid crystal material.

7. The liquid crystal film according to any one of Items 4 to 6, wherein the translucent substrate film is a triacetyl cellulose (TAC) film.

8. The liquid crystal film according to item 7, wherein the translucent substrate film is a triacetyl cellulose (TAC) film having a thickness of 50 μm or less.

9. A laminated film for an optical element, wherein the liquid crystal film according to any one of items 1 to 8 is laminated with a polarizing film via an adhesive.