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WO2004090591A1 - Procede de production d'un lamine optique comprenant le lamine optique, une plaque a polarisation elliptique, une plaque a polarisation circulaire et une unite d'affichage a cristaux liquides, et lamine optique correspondant - Google Patents

Procede de production d'un lamine optique comprenant le lamine optique, une plaque a polarisation elliptique, une plaque a polarisation circulaire et une unite d'affichage a cristaux liquides, et lamine optique correspondant Download PDF

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Publication number
WO2004090591A1
WO2004090591A1 PCT/JP2004/004984 JP2004004984W WO2004090591A1 WO 2004090591 A1 WO2004090591 A1 WO 2004090591A1 JP 2004004984 W JP2004004984 W JP 2004004984W WO 2004090591 A1 WO2004090591 A1 WO 2004090591A1
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WIPO (PCT)
Prior art keywords
liquid crystal
crystal material
material layer
layer
adhesive
Prior art date
Application number
PCT/JP2004/004984
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English (en)
Japanese (ja)
Inventor
Tetsuya Uesaka
Kenji Hosaki
Haruyoshi Sato
Original Assignee
Nippon Oil Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Oil Corporation filed Critical Nippon Oil Corporation
Publication of WO2004090591A1 publication Critical patent/WO2004090591A1/fr

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid

Definitions

  • the present invention relates to a method for producing an optical laminate useful for various optical elements.
  • the present invention relates to an elliptically polarizing plate or a circularly polarizing plate comprising the optical laminate obtained by the production method, and further relates to a liquid crystal display device including the elliptically polarizing plate or the circularly polarizing plate.
  • Thin films composed of liquid crystal compound alignment layers are used for color compensation for liquid crystal display devices and viewing angle compensation. It has excellent performance as an element and as an optical rotation optical element, etc., and contributes to high performance and weight reduction of various display elements.
  • a method for producing these films a method has been proposed in which a layer composed of a liquid crystal material formed on an alignment substrate is transferred onto a light-transmitting substrate also serving as a support substrate (see, for example, Japanese Patent Application Laid-Open No. H04-5-95). Japanese Patent Application Laid-Open No. 7-17, JP-A-4-1777216).
  • a method of manufacturing an optical element made of a liquid crystal material without using a supporting substrate film has been proposed for further reduction in thickness and weight (for example, Japanese Patent Application Laid-Open No. 8-2788491). .
  • a layer made of a liquid crystal material which is aligned and formed on an alignment substrate is temporarily transferred to a removable substrate through an adhesive, and then the removable substrate is separated. It has become possible to manufacture an optical element consisting of a liquid crystal material layer without a supporting substrate film.
  • optical films used in various display devices such as liquid crystal display devices have been required to have higher-performance optical performance, and the use of only one optical film can satisfy the requirements. Instead, they are increasingly used in layers.
  • lamination of a stretched polymer film typified by polycarbonate in a retardation film for color compensation of an STN liquid crystal display device circular polarization for a transflective liquid crystal display device
  • the plate include a broadband 14-wavelength plate formed by laminating a 1/4 wavelength plate and a 1/2 wavelength plate, or a broadband circularly polarizing plate formed by laminating cholesteric films having different selected wavelength regions.
  • An object of the present invention is to achieve both high functionality of optical characteristics, high durability, and a significant reduction in thickness, which were difficult with a polymer stretched film alone.
  • focusing on an optical film composed of a liquid crystal material layer that is thinner and capable of exhibiting an excellent optical function a manufacturing method for laminating an optical element composed of at least two or more liquid crystal substance layers on one supporting substrate film is described. As a result of intensive studies, the present invention has finally been completed.
  • the first aspect of the present invention is as follows: (1) After bonding a liquid crystal material layer 1 having a fixed liquid crystal alignment formed on an alignment substrate to an isotropic substrate via an adhesive layer, The first step of peeling the plate and transferring the liquid crystal material layer 1 to the isotropic substrate to obtain a laminate (A) composed of the isotropic substrate adhesive layer / liquid crystal material layer 1; The formed liquid crystal material layer 2 having a fixed liquid crystal orientation is bonded to the liquid crystal material layer 1 via a viscous / adhesive layer, and isotropic substrate.
  • Adhesive layer Liquid crystal material layer 1 Adhesive (adhesive) Layer Z liquid crystal material layer 2nd step of obtaining a laminate (B) comprising an alignment substrate, and (3) before A third step of peeling off the alignment substrate of the laminate (B) and bonding a polarizing plate to the isotropic substrate or the liquid crystal material layer 2; About the method.
  • the liquid crystal material layer 1 and the liquid crystal material layer 2 have the same or different optical parameters. About.
  • the present invention in the method for manufacturing an optical laminate described above, at least one of the liquid crystal material layer 1 and the liquid crystal material layer 2 is formed of an optically positive uniaxial liquid crystal material in a liquid crystal state.
  • the present invention relates to a method for producing an optical laminate, comprising a liquid crystal material layer having a fixed nematic alignment.
  • a fourth aspect of the present invention is the method for manufacturing an optical laminate according to the above aspect, wherein at least one of the liquid crystal material layer 1 and the liquid crystal material layer 2 is formed of a liquid crystal material having optically positive uniaxiality in a liquid crystal state.
  • the present invention relates to a method for producing an optical laminate, comprising a liquid crystal material layer having a fixed hybrid nematic alignment.
  • the present invention in the method for manufacturing an optical laminate described above, at least one of the liquid crystal material layer 1 and the liquid crystal material layer 2 is formed of an optically positive uniaxial liquid crystal material in a liquid crystal state.
  • the present invention relates to a method for producing an optical laminate, comprising a liquid crystal material layer having a fixed twisted nematic alignment.
  • a sixth aspect of the present invention relates to an elliptically polarizing plate comprising the optical laminate obtained by the above-described production method.
  • a seventh aspect of the present invention relates to a circularly polarizing plate comprising the optical laminate obtained by the above-described production method.
  • An eighth aspect of the present invention relates to a liquid crystal display device comprising at least the elliptically polarizing plate or the circularly polarizing plate described above.
  • the liquid crystal material layer in which the orientation of the liquid crystal used in the present invention is fixed is a layer which is fixed by using a means for fixing the liquid crystal material in the aligned state.
  • a means for fixing the liquid crystal material in the aligned state In the case of a liquid crystal substance, a method of quenching from an alignment state to fix it in a vitrified state, orienting a low-molecular or high-molecular liquid crystal substance having a reactive functional group, and then reacting the functional group (curing Cross-linking, etc.).
  • Examples of the reactive functional group include a vinyl group, a (meth) acryloyl group, a siloxane group, an epoxy group, an oxetanyl group, a carboxyl group, a hydroxyl group, an amino group, an isocyanate group, and an acid anhydride.
  • the reaction is carried out in a manner appropriate for the group of
  • the liquid crystal material that can be used in the liquid crystal material layer can be selected from a wide range, regardless of whether it is a low-molecular liquid crystal material or a high-molecular liquid crystal material, depending on the intended production method of the liquid crystal film. Molecular liquid crystal materials are preferred. Further, the molecular shape of the liquid crystal substance does not matter whether it is rod-shaped or disk-shaped. For example, a discotic liquid crystal compound exhibiting discotic nematic liquid crystallinity can also be used.
  • liquid crystal phase of the liquid crystal material layer before immobilization examples include a nematic phase, a twisted nematic phase, a cholesteric phase, a hybrid nematic phase, a hybrid twisted nematic phase, a discotic nematic phase, and a smectic phase.
  • the polymer liquid crystal material various kinds of main chain polymer liquid crystal materials, side chain polymer liquid crystal materials, or a mixture thereof can be used.
  • the main-chain polymer liquid crystal materials include polyester, polyamide, polycarbonate, polyimide, polyurethane, polybenzimidazole, polybenzoxazole, polybenzthiazole, polyazomethine, and polyester. Examples include amide-based, polyester carbonate-based, polyesterimide-based high-molecular liquid crystal substances, and mixtures thereof.
  • the side chain type polymer liquid crystal substance a substance having a linear or cyclic structure skeleton such as polyacrylate, polymethacrylate, polyvinyl, polysiloxane, polyether, polymalonate, and polyester is used. Mesogen group as a side chain attached to the polymer liquid crystal substance, or a mixture thereof Is mentioned. Of these, polyesters of the main chain type polymer liquid crystal material are preferred from the viewpoint of ease of synthesis and orientation.
  • Low-molecular liquid crystal substances include saturated benzene carboxylic acids, unsaturated benzene carboxylic acids, biphenyl carboxylic acids, aromatic oxy carboxylic acids, Schiff bases, bis azomethine compounds, azo compounds, azoxy compounds, and cyclohexane.
  • Examples thereof include compounds having liquid crystallinity in which the reactive functional group is introduced into the terminal such as stele compounds and sterol compounds, and compositions in which a crosslinkable compound is added to a compound having liquid crystallinity among the above compounds.
  • the discotic liquid crystal compound include a triphenylene-based compound and a torxene-based compound.
  • various compounds having a functional group or site capable of undergoing a cross-linking reaction by heat or light in the liquid crystal substance may be blended as long as the development of liquid crystal properties is not hindered.
  • the functional group capable of performing 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 formed by a method of applying a composition containing the liquid crystal material or various compounds to be added as needed on an alignment substrate in a molten state, or a solution of the composition. Is applied by a method such as coating on an alignment substrate.
  • the coating applied on the alignment substrate is dried, heat-treated (liquid crystal alignment), and then irradiated with light and Z or heat treatment (polymerization / crosslinking) as necessary. It is formed by fixing the orientation using the means for fixing the orientation described above.
  • the solvent used for preparing the solution is not particularly limited as long as it can dissolve the liquid crystal substance or composition used in the present invention and can be distilled off under appropriate conditions.
  • acetone and methyl ethyl ketone Ketones such as isophorone, ethenole alcohols such as butoxyshethyl alcohol, hexyloxyethyl alcohol, methoxyl-2-propyl alcohol, glycol ethers such as ethylene glycol dimethyl ether and diethylene glycol dimethyl ether, and acetic acid.
  • Estenoles such as ethynole, methoxypropyl acetate, ethyl lactate, etc .; phenols such as phenol, phenol, etc .; Amides, chloroform, te Norakuro port ethanone down, halogenated hydrocarbons such or a mixture of these systems, such as dichlorobenzene are used properly preferred.
  • a surfactant An antifoaming agent, a leveling agent and the like may be added to the solution.
  • dichroic dyes, ordinary dyes, pigments, and the like may be added for the purpose of coloring, as long as the development of liquid crystal properties is not hindered.
  • the coating method is not particularly limited as long as uniformity of the coating film is ensured, and a known method can be employed. For example, a roll coating method, a dicoat method, a dip coating method, a curtain coating method, a spin coating method and the like can be mentioned. After the application, a solvent removing (drying) step by a method such as a heater or hot air blowing may be inserted.
  • the thickness of the applied film in a dry state is from 0.2 to 50 im, preferably from 0.2 to 20 m, and more preferably from 0.3 to 10 ⁇ . Outside this range, the optical performance of the obtained liquid crystal material layer becomes insufficient, and the orientation of the liquid crystal material becomes unfavorable.
  • the orientation of the liquid crystal is formed by heat treatment or the like, the orientation is fixed.
  • the liquid crystal is aligned by the self-alignment ability inherent to the liquid crystal material by heating the liquid crystal phase to the temperature range in which the liquid crystal phase appears.
  • the conditions for the heat treatment cannot be unconditionally determined because the optimum conditions and limit values vary depending on the liquid crystal phase behavior temperature (transition temperature) of the liquid crystal substance used, but it is usually 10 to 300 ° C, preferably 30 to 300 ° C. It is in the range of 250 ° C. If the temperature is too low, the alignment of the liquid crystal may not proceed sufficiently, and if the temperature is high, the liquid crystal material may be decomposed or adversely affect the alignment substrate.
  • the heat treatment time is usually in the range of 3 seconds to 60 minutes, preferably in the range of 10 seconds to 30 minutes. If the heat treatment time is shorter than 3 seconds, the alignment of the liquid crystal may not be sufficiently completed, and if the heat treatment time is longer than 60 minutes, the productivity is extremely deteriorated, and either case is not preferable.
  • the liquid crystal material layer on the alignment substrate is fixed as it is by using a method suitable for the liquid crystal material used.
  • alignment substrate examples include polyimide, polyamide, polyamide imide, polyphenylene sulfide, polyphenylene oxide, polyetherene ketone, polyester enole ether ketone, polyether enoles phenol, polyethylene terephthalone, polyethylene terephthalate, and polyethylene.
  • examples include films of naphthalate, polyarylate, triacetyl cellulose, epoxy resin, phenol resin and the like.
  • rubbing treatment is performed by providing an orientation film made of a known orientation agent such as an alcohol or a silane coupling agent, or oblique vapor deposition treatment of silicon oxide or the like, or a combination thereof is used to develop the orientation ability.
  • a film may be used.
  • a metal plate such as aluminum, iron, or copper provided with a large number of regular fine grooves on the surface, or various glass plates can be used.
  • the orientation direction of the oriented substrate film is not particularly limited, and can be appropriately selected by performing each of the above-described processes in any direction.
  • a predetermined angle is selected with respect to the MD direction of the long continuous film, and the liquid crystal is aligned in an oblique direction as necessary. It is desirable that When the liquid crystal film is laminated in a shaft arrangement that can exhibit optimal optical characteristics by performing orientation treatment in a predetermined angle direction, lamination with the MD of the long film aligned (so-called roll-to-roll) This is extremely advantageous in that bonding can be performed, or the efficiency of product picking can be increased.
  • the adhesive used in the present invention is not particularly limited as long as it has a sufficient adhesive force to the liquid crystal material layer and the isotropic substrate and does not impair the optical characteristics of the liquid crystal material layer.
  • Various reactive types such as a line-curing type can be used.
  • These adhesives include those having the function of a transparent protective layer for protecting the liquid crystal material layer. Note that an adhesive can be used as the adhesive.
  • reaction (curing) conditions of the above-mentioned reactive substances vary depending on the components constituting the adhesive, the viscosity, the reaction temperature, and the like, conditions suitable for each may be selected.
  • a photocuring type preferably, various known photoinitiators are added
  • the reaction may be performed by irradiating light from a light source such as a halide lamp, high-pressure mercury lamp, low-pressure mercury lamp, xenon lamp, arc lamp, laser, or synchrotron radiation light source.
  • the irradiation amount per unit area (1 square centimeter) is usually 1 to 200 mJ, preferably 10 to 100 mJ as an integrated irradiation amount.
  • the acceleration voltage in the case of the electron beam curing type is usually from 10 kV to 200 kV, preferably from 50 kV to 100 kV.
  • the thickness of the adhesive layer varies depending on the components constituting the adhesive, the strength of the adhesive, the operating temperature, and the like, but is usually 1 to 50 m, preferably 2 to 30 ⁇ , and more preferably 3 to 50 ⁇ . ⁇ 10 / im. Outside this range, the adhesive strength is insufficient, and bleeding from the end is unfavorable.
  • these adhesives may be added with various fine particles or a surface modifier for the purpose of controlling the optical characteristics or controlling the peelability or erosion of the substrate as long as the characteristics are not impaired. .
  • the fine particles include fine particles having a different refractive index from the compound constituting the adhesive, conductive fine particles for improving antistatic performance without impairing transparency, and fine particles for improving abrasion resistance.
  • Specific examples include fine silica, fine alumina, ITO (Indium Tin Oxide) fine particles, silver fine particles, and various synthetic resin fine particles.
  • 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, fluorosurfactants, organometallic surfactants such as silicones, and reactive surfactants can be used.
  • fluorosurfactants such as perfluoroalkyl compounds and perfluoropolyether compounds
  • organometallic surfactants such as silicone are particularly preferable because of their large surface modification effect.
  • the addition amount of the surface modifier 0. 0 1-1 0 range of weight percent is desirable to adhesive, more preferably 0. 0 5 to 5 weight 0 /. , Further Preferably 0.1 to 3% by mass. If the amount is less than this range, the effect of the addition becomes insufficient, while if the amount is too large, there is a possibility that adverse effects such as an excessive decrease in the adhesive strength may occur.
  • the surface modifier may be used alone or in combination of two or more as necessary.
  • additives such as an antioxidant and an ultraviolet absorber may be blended as long as the effects of the present invention are not impaired.
  • Examples of the isotropic substrate used in the present invention include 4-methylpentene-11, polymethyl methacrylate, polystyrene, polycarbonate, polyether sulfone, polyphenylene sulfide, polyarylate, amorphous polyolefin, norbornene-based resin, and tria-based resin.
  • Various films such as cetyl cellulose or epoxy resin can be used.
  • the polarizing plate used in the present invention is not particularly limited as long as the object of the present invention can be achieved, and a polarizing plate usually used in a liquid crystal display device can be appropriately used.
  • the above-mentioned thin film type is desirable.
  • a hydrophilic polymer film composed of a PVA-based polarizing film such as polyvinyl alcohol (PVA) or partially acetalized PVA, or a partially saponified ethylene monovinyl acetate copolymer, etc.
  • a polarizing film formed by adsorbing and / or stretching a dichroic dye, or a polarizing film composed of a polyene oriented film such as a dehydrated PVA product or a dehydrochlorinated polyvinyl chloride product can be used. Further, a reflection type polarizing film can also be used.
  • the polarizing plate may be used alone or as a polarizing film provided with a transparent protective layer or the like on one or both sides of the polarizing film for the purpose of improving strength, moisture resistance, heat resistance and the like. Is also good.
  • the transparent protective layer include a laminate of a transparent plastic film such as polyester or triacetyl cellulose directly or via an adhesive layer, a resin coating layer, and a photo-curable resin layer such as an acrylic or epoxy resin. Is received.
  • the same transparent protective layer may be provided on both sides, or different transparent protective layers may be provided.
  • a liquid crystal material coating film is formed on an alignment substrate by an appropriate method, the solvent and the like are removed if necessary, the liquid crystal alignment is completed by heating, etc., and the liquid crystal is formed by means suitable for the liquid crystal material used.
  • the orientation of the material layer 1 is fixed.
  • an adhesive layer is formed on the liquid crystal material layer 1 in which the orientation is fixed, and the liquid crystal material layer 1 and the isotropic substrate are brought into close contact with each other via the adhesive layer. After curing, the alignment substrate is peeled off.
  • the liquid crystal material layer 1 having the fixed orientation can be transferred to the isotropic substrate.
  • a laminate (A) composed of the liquid crystal material layer 1 adhered to the isotropic substrate via the adhesive layer can be obtained.
  • a transparent protective layer may be provided on the exposed liquid crystal material layer, or a surface protective film may be bonded to protect the surface of the liquid crystal material layer.
  • the material of the transparent protective layer can be selected from the aforementioned adhesives.
  • a shock absorbing layer can be formed on the transparent protective layer or the liquid crystal material layer 1 using a removable substrate described later, and then the liquid crystal material layer 2 can be laminated.
  • the layer structure of the laminate (A) composed of the liquid crystal material layer 1 formed on the isotropic substrate of the present invention via the adhesive layer has the following structure:
  • the liquid crystal material layer 2 formed on the alignment substrate and having the liquid crystal alignment fixed is bonded to the liquid crystal material layer 1 of the laminate (A) via a viscous / adhesive layer, Isotropic substrate Z-adhesive layer Liquid-crystal material layer 1 Z-adhesive (adhesive) layer Z-liquid-crystal material layer 2 Manufacture laminate (B) consisting of oriented substrate.
  • the liquid crystal material layer 2 formed on the alignment substrate is transparently protected on the exposed liquid crystal material layer to protect the surface of the liquid crystal material layer.
  • a protective layer may be provided or a surface protective film may be bonded.
  • the transparent protective layer at this time can also be selected from the above-mentioned adhesives.
  • the liquid crystal material layer 1 and the liquid crystal material layer 2 may have the same or different optical parameters. That is, a combination of liquid crystal material layers required from the viewpoint of optical characteristics and the like can be selected.
  • the optical parameters include the thickness of the liquid crystal material layer, the intrinsic or apparent birefringence of the liquid crystal material, the retardation, the orientation fixed state, the presence or absence of twist, the twist angle, and the like.
  • the adhesive layer and the pressure-sensitive adhesive layer can be arbitrarily selected according to the releasability and required characteristics, and may be the same or different.
  • the alignment substrate of the laminate (B) obtained in the second step is peeled off, and an adhesive (adhesive) is applied to either the peeled surface (the liquid crystal material layer 2) or the isotropic substrate.
  • An optical laminate of the present invention can be obtained by laminating a polarizing plate via a layer (agent or adhesive).
  • the polarizing plate may be bonded after peeling the alignment substrate, or the alignment substrate may be peeled after bonding the polarizing plate.
  • the exposed liquid is used to protect the surface of the liquid crystal material layer 2 on the peeled surface (liquid crystal material layer 2) after peeling the alignment substrate.
  • An adhesive layer is formed on the crystalline material layer 2, and the liquid crystal material layer 2 and the removable substrate are brought into close contact with each other via the adhesive layer.
  • a polarizing plate may be attached after being provided as a transparent protective layer and peeling off the removable substrate.
  • the removable substrate include polyethylene, polypropylene, and olefin resin such as 4-methylpentene-11 resin, polyamide, polyamide, polyamide imide, polyether imide, polyether ketone, polyether ether ketone, and polyether amide.
  • Athenoresnorethone polyketone sanolefied, polysnolephone, polystyrene, polyphenylene sulfide, polyphenylene oxide, polyethylene terephthalate, polybutylene terephthalate, polyarylate, polyacetal, uniaxially stretched polyester, polycarbonate, polyvinyl alcohol , Polymethyl methacrylate, polyarylate, amorphous polyolefin, norbornene resin, triacetyl cellulose, epoxy resin, etc. Irumu is that you can use.
  • a transparent and optically isotropic film which is excellent in inspecting optical defects is preferable, and 4-methylpentene-11, polymethyl methacrylate, polystyrene, polycarbonate, polyethersulfone, and polyolefin are exemplified as the isotropic substrate.
  • These plastic films may be coated in advance with silicone or have an organic thin film or an inorganic thin film formed thereon in order to have an appropriate removability. Further, for the same purpose, the surface of the plastic film may be subjected to chemical treatment such as saponification treatment or physical treatment such as corona treatment.
  • the above plastic film may contain a lubricant or a surface modifier.
  • the type and amount of the lubricant are not particularly limited as long as they do not adversely affect the testability and peelability of optical defects.
  • Specific examples of the lubricant include fine silica, fine alumina, and the like.As an index 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 it is too large, the testability of optical defects deteriorates, which is not preferable.
  • the peeling force of a removable substrate cannot be determined unconditionally even for a removable substrate manufactured from the same material because it changes depending on the manufacturing method, surface condition, and wettability with the adhesive used.
  • the peeling force at the interface between the substrate and the adhesive layer (180 ° peeling, peeling speed 3 Ocm / min, measured at room temperature) 1 Normally 0.38 to 12 NZm, preferably 0 It is desirable that the pressure be between 38 and 8.0 NZm.
  • the peeling force is lower than this value, the peeling force is too low and the releasable substrate may be lifted, so that a favorable peeling state at the desired interface cannot be obtained, and the peeling off from the liquid crystal material layer 2 is performed again. There is a possibility that a desired surface protective layer cannot be formed between the substrate and the conductive substrate. Also, if the peeling force is too high, the liquid crystal material layer may be broken or the adhesive layer may not be peeled off at the interface with the surface protective layer when the peelable substrate is peeled off. Is not preferred.
  • the thickness of the re-peelable substrate may also affect the releasability, preferably from 16 to 100 // m, particularly preferably from 25 to 50 z m. If the thickness is too large, the peeling point may not be stable and the peelability may be deteriorated. On the other hand, if the thickness is too small, the film may not be able to maintain its mechanical strength, which may cause a problem such as tearing during production. You.
  • an optical laminate having, for example, the following configuration can be obtained through at least the above steps.
  • Polarizing plate adhesive (adhesive) layer isotropic substrate Adhesive layer Z liquid crystal material layer 1
  • Polarizing plate Adhesive (adhesive) layer Z isotropic substrate Adhesive layer Z Liquid crystal material layer 1 Adhesive (adhesive) layer Liquid crystal material layer 2 Z transparent protective layer
  • Polarizing plate / adhesive (adhesive) layer Isotropic substrate Adhesive layer Z liquid crystal material layer 1 Z adhesive layer Adhesive (adhesive) layer Z liquid crystal material layer 2 Transparent protective layer
  • a liquid crystal material layer having a fixed orientation on an alignment substrate is laminated on a liquid crystal material layer transferred onto an isotropic substrate via an adhesive layer or an adhesive layer, and then the orientation substrate is peeled off. By repeating the operation, a plurality of liquid crystal material layers can be stacked.
  • an adhesive with a release film is attached to the opposite surface of the oriented substrate in a form in which the oriented substrate remains on one surface, and the oriented substrate is peeled off to obtain an adhesive.
  • the release film of the agent can be used as a new removable support substrate.
  • a buffer layer is formed between the liquid crystal material layer and another layer by using a removable substrate in which a buffer layer that can be peeled off from the substrate is formed in advance on the removable substrate surface. It is also possible. By forming the buffer layer, a stress-reducing effect can be obtained to suppress a change in the appearance of the thin liquid crystal material layer (for example, waving) during manufacturing or environmental testing.
  • the buffer layer is not particularly limited, A chemically isotropic transparent layer is preferable, and examples thereof include polymers such as acrylic, methacrylic, nitrocellulose, and epoxy compounds, and mixtures thereof.
  • the thickness of the buffer layer is from 0.3 ⁇ m to 40 / zm, preferably from 0.5 ⁇ to 10 ⁇ , and the glass transition point (T g) is preferably at least 20 ° C. Is an optically isotropic transparent layer at 50 ° C. or higher, and the material is not particularly limited as long as the optical characteristics of the liquid crystal material layer are not significantly impaired. If the film thickness and the glass transition point are out of these ranges, the effects are insufficient, and the thin film, which is a part of the object of the present invention, is not preferred.
  • the physical properties of the buffer layer may be controlled by partial crosslinking by addition of a crosslinking component, addition of a plasticizer, addition of a lubricant, or the like.
  • the method of forming the buffer layer is not particularly limited.
  • a material for forming the buffer layer having the above-mentioned thickness is coated on a removable substrate such as polyethylene, polypropylene, or polyethylene terephthalate.
  • Transfer method in which this layer is formed in advance by a method such as extrusion or the like, and this layer is adhered through a pressure-sensitive adhesive layer or a transparent protective layer, and then the peelable substrate is peeled off.
  • the optical laminate of the present invention may include one or more layers of an antireflection layer, an antiglare treatment layer, a hard coat layer, and a light diffusion layer, in addition to the polarizing plate and the liquid crystal material layer.
  • the adhesive or the like used for lamination or adhesion to the polarizing plate is not particularly limited as long as it is an optical grade, and for example, a suitable one from the above-mentioned adhesives can be used.
  • the total thickness of the optical laminate of the present invention produced as described above is 450 / m or less, preferably 350 ⁇ m or less, more preferably 300 ⁇ m or less. Outside this range, it is not preferable because it does not meet the purpose of thinning, which is one of the objects of the present invention.
  • the optical laminate of the present invention can function as a compensation member, an elliptically polarizing plate, and a circularly polarizing plate for various liquid crystal display devices according to the optical parameters of the liquid crystal material layer.
  • the liquid crystal material layer constituting the optical laminate has a liquid crystal material layer in which, for example, a nematic alignment or a twisted nematic alignment is fixed, functions as a retardation plate.
  • the laminate can be used as a compensator for a transmissive or reflective liquid crystal display device such as an STN type, a TN type, an OCB type, a HAN, a homogeneous type, a VA type, and an IPS.
  • the liquid crystal material layer in which the hybrid nematic alignment is fixed can be used as a retardation film or a wave plate using retardation when viewed from the front, and the direction of the retardation value (film thickness) It can also be used as a viewing angle improving member for TN-type liquid crystal display devices by utilizing the asymmetry caused by the tilt of the molecular axis in the vertical direction).
  • the liquid crystal material layer having the function of a 1Z4 wavelength plate can be used as a circularly polarizing plate, a reflection type liquid crystal display device, an antireflection filter of an EL display device, or the like by combining it with a polarizing plate as in the present invention. it can.
  • a 14 wave plate with a 550 nm monochromatic light with a birefringent phase difference of approximately 1/4 wavelength and a 550 nm plate It is generally known that it is effective to laminate a 12-wave plate with a birefringent light having a phase difference of approximately 1Z2 wavelength in a monochromatic light of nm with their slow axes crossing each other. Actually, it is widely used in reflection type liquid crystal display devices. That is, if the technique of obtaining a thin optical laminate as in the production method of the present invention is used, a thin broadband 14-wavelength plate, which was difficult only with a conventional stretched polymer film, can be obtained.
  • the retardation value of the 14-wavelength plate is usually 50 nm to 180 nm, preferably 70 nm! 1160 nm, particularly preferably 90 nm ⁇ : 150 nm.
  • the retardation value of the 12 wavelength plate is usually from 180 nm to 320 nm, preferably from 200 nm to 300 nm, particularly preferably 220 nm! 280 nm. If the retardation range of the 1/4 wavelength plate and the 1/4 wavelength plate deviates from the above, unnecessary coloring may occur on the liquid crystal display device.
  • the retardation value represents the product of the birefringence ⁇ n and the film thickness d.
  • the liquid crystal material layer constituting the laminate has a fixed cholesteric or smectic orientation, a polarizing reflection film for improving brightness, a reflection type color filter, It can be used for various anti-counterfeiting elements and decorative films that make use of the color change of the reflected light due to the viewing angle due to the reflectivity.
  • the present invention will be described in more detail with reference to Examples and Comparative Examples, taking the production of a circularly polarizing plate as an example, but the present invention is not limited thereto.
  • the retardation (product of birefringence ⁇ n and film thickness d) in this example is a value at a wavelength of 550 nm unless otherwise specified.
  • This liquid crystalline polyester (Polymer 1) has a logarithmic viscosity (phenol tetrachloroethane (6Z4 mass ratio) mixed solvent: 30 ° C) of 0.16 d1 ng, a nematic phase as a liquid crystal phase, and an isotropic phase.
  • the liquid crystal phase transition temperature was 250 ° C or higher, and the glass transition temperature measured by a differential scanning calorimeter (DSC) was 112 ° C.
  • liquid crystal material layer 2 having a uniform orientation of 1.4 m was obtained.
  • a commercially available UV-curable adhesive (UV-3400, manufactured by Toagosei Co., Ltd.) is applied to the adhesive layer 1 to a thickness of 5 / m as a layer, and a 40 im thick isotropic substrate, triaceti, is applied thereon.
  • a cellulose (TAC) film 1 (manufactured by Fuji Photo Film Co., Ltd.) was laminated, and the adhesive layer 1 was cured by UV irradiation at about 600 mJ.
  • the liquid crystal material layer 1 is an isotropic substrate by peeling the polyimide film from the laminate in which the TAC film 1 adhesive layer 1Z liquid crystal material layer 1Z polyimide film is formed.
  • the liquid crystal laminate (A) composed of the TAC film 1, the adhesive layer 1, and the Z liquid crystal material layer 1 was obtained.
  • the And of the liquid crystal laminate (A) was 140 nm.
  • a commercially available UV-curable adhesive (UV-3400) was applied on the liquid crystal material layer 1 (the surface opposite to the TAC film 1) of the obtained liquid crystal laminate (A) to a thickness of 5 ⁇ . Then, the surface of the liquid crystal material layer 2 whose orientation is fixed on the polyimide film obtained in the preparation example is laminated on the polyimide film, and UV irradiation of about 60 OmJ is applied from the TAC film 1 side. The adhesive layer 2 was cured. By peeling the polyimide film from this laminate, a laminate comprising a TAC film 1 adhesive layer 1 liquid crystal material layer 1 Z adhesive layer 2 liquid crystal material layer 2 was obtained.
  • a circularly polarizing plate of the present invention comprising a polarizing plate, an adhesive layer, a liquid crystal material layer 2, an adhesive layer 2Z a liquid crystal material layer 1, an adhesive layer 1 and a ZTAC film 1 was obtained.
  • the total thickness of the circularly polarizing plate was 190 / im.
  • Example 1 The circularly polarizing plate obtained in Example 1 was adhered to the upper and lower sides of a liquid crystal cell of a commercially available transflective TFT liquid crystal display device using an adhesive, and the display characteristics were evaluated. Excellent display was obtained in both the reflection mode and the transmission mode. In addition, when the display device was subjected to two types of durability tests: 1 at 60 ° C and 90% RH for 500 hours, 2 at 80 ° C and dry for 500 hours, no abnormalities in appearance such as peeling or cracking were observed. I was not able to admit. (Comparative Example 1)
  • a commercially available uniaxially stretched polycarbonate film 1 (thickness 60; um, Andl 35 nm) and polycarbonate finolem 2 (thickness 60 ⁇ , And 270 nm) are bonded together using a 25 ⁇ adhesive, and the polycarbonate is laminated.
  • Film 1Z pressure-sensitive adhesive layer—Laminated body composed of polycarbonate film 2 was obtained.
  • a polarizing plate (thickness: about 105 m; 3 ⁇ -062 manufactured by Sumitomo Chemical Co., Ltd.) in which a 25 ⁇ m pressure-sensitive adhesive layer was previously formed on one surface of two sides of the polycarbonate of the laminate, was laminated.
  • a circularly polarizing plate composed of the Z pressure-sensitive adhesive layer, the polycarbonate film 2 and the pressure-sensitive adhesive layer / the polycarbonate film 1 was obtained.
  • the total thickness of the circularly polarizing plate was 275 ⁇ .
  • One side of a commercially available uniaxially stretched norbornene-based film 1 is pasted with an adhesive layer with a thickness of 25 ⁇ ⁇ ⁇ previously formed on a silicon-treated PET film.
  • a polarizing plate (thickness: about 105 ⁇ m; SQW-062 manufactured by Sumitomo Chemical Co., Ltd.) in which an adhesive layer having a thickness of 25 m was previously formed on one side of the surface of the film on which the adhesive was not bonded.)
  • a laminate comprising a polarizing plate, an adhesive layer, a norbornene-based film 1, a Z adhesive layer, and a silicone-treated PET film.
  • the silicone-treated PET film of the laminate is peeled off, and a commercially available uniaxially stretched norbornene-based film 2 (thickness 80 / m, An dl 30 nm; A-ton manufactured by JSR Corporation) is bonded.
  • a circularly polarizing plate composed of the polarizing plate, the pressure-sensitive adhesive layer Z and the norbornene-based film 2 was obtained.
  • the total thickness of the circularly polarizing plate was 390 ⁇ .
  • the present invention it is possible to establish an industrial manufacturing method of laminating at least two or more liquid crystal material layers on one supporting substrate film, and conventionally, a polymer stretched film is used.
  • Extremely high industrial value such as the ability to obtain a new optical laminate that achieves both high functionality of the optical characteristics and significant reduction in thickness, which was difficult with a laminate using only lume.

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

Abstract

L'invention concerne un procédé de production d'un laminé d'un élément optique, composé de couches de substances de cristaux liquides exempts de tout film substrat support, procédé comprenant au moins une première étape (1) de liaison d'une couche de substance de cristaux liquides (1) d'un alignement de cristaux liquides fixes, formé sur un substrat d'alignement, à travers une couche adhésive sur un substrat isotrope, et détachement subséquent du substrat d'alignement, de manière à effectuer le transfert de la couche de substance de cristaux liquides (1) sur le substrat isotrope, ce qui permet d'obtenir un laminé (A): couche substrat isotrope/couche adhésive/couche de substance de cristaux liquides (1) ; une deuxième étape (2) de liaison d'une couche de substance de cristaux liquides (2) d'un alignement de cristaux liquides fixes, formé sur un substrat d'alignement, à travers une couche auto-adhésive (adhésive) sur la couche de substance de cristaux liquides précitée (1), ce qui permet d'obtenir un laminé (B): substrat isotrope/couche adhésive/couche de substance de cristaux liquides (1)/couche auto-adhésive (adhésive)/couche de substance de cristaux liquides (2)/substrat d'alignement ; et une troisième étape (3) consistant à détacher le substrat d'alignement du laminé (B) et à lier une plaque de polarisation au substrat isotrope ou à la couche de substance de cristaux liquides (2).
PCT/JP2004/004984 2003-04-07 2004-04-07 Procede de production d'un lamine optique comprenant le lamine optique, une plaque a polarisation elliptique, une plaque a polarisation circulaire et une unite d'affichage a cristaux liquides, et lamine optique correspondant WO2004090591A1 (fr)

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JP2003102921A JP2004309772A (ja) 2003-04-07 2003-04-07 光学積層体の製造方法、当該積層体からなる楕円偏光板、円偏光板および液晶表示装置
JP2003-102921 2003-04-07

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CN100394226C (zh) * 2004-12-14 2008-06-11 日东电工株式会社 椭圆偏光板、其制法和使用该椭圆偏光板的图像显示装置
CN100489575C (zh) * 2004-12-22 2009-05-20 日东电工株式会社 椭圆偏光板及使用该椭圆偏光板的图像显示装置
US20090040434A1 (en) * 2005-02-25 2009-02-12 Nitto Denko Corporation Method of producing elliptically polarizing plate and image display apparatus using the elliptically polarizing plate
CN100405183C (zh) * 2005-02-25 2008-07-23 日东电工株式会社 椭圆偏光板的制造方法及使用该椭圆偏光板的图像显示器
WO2006100830A1 (fr) * 2005-03-23 2006-09-28 Nitto Denko Corporation Procédé de fabrication de film optique et appareil d’affichage d’image utilisant le film optique produit par le procédé
JP2007148097A (ja) * 2005-11-29 2007-06-14 Nitto Denko Corp 光学フィルムの製造方法、光学フィルム、および光学フィルムを用いた画像表示装置
JP2007156234A (ja) * 2005-12-07 2007-06-21 Nitto Denko Corp 光学フィルムの製造方法、光学フィルム、および光学フィルムを用いた画像表示装置
US20090176077A1 (en) * 2006-03-31 2009-07-09 Dai Nippon Printing Co., Ltd. Optical layered body
TW200839320A (en) * 2007-03-28 2008-10-01 Far Eastern Textile Ltd Polarizer and its manufacturing method, and liquid crystal display panel
JP4994309B2 (ja) * 2008-06-06 2012-08-08 Ｊｘ日鉱日石エネルギー株式会社 傾斜位相差フィルム、傾斜位相差フィルムの製造方法、偏光板および液晶表示装置
JP5365184B2 (ja) * 2008-12-25 2013-12-11 大日本印刷株式会社 液晶表示装置
JP5958731B2 (ja) * 2010-03-30 2016-08-02 Dic株式会社 光学素子及びそれを用いた液晶パネル
JP2014013291A (ja) * 2012-07-04 2014-01-23 Dainippon Printing Co Ltd 光学フィルム用転写体、光学フィルム、画像表示装置及び光学フィルムの製造方法
TWI645962B (zh) * 2013-08-09 2019-01-01 住友化學股份有限公司 光學異向性薄片
JP6175972B2 (ja) * 2013-08-20 2017-08-09 大日本印刷株式会社 光学フィルム、画像表示装置、光学フィルム用転写体、光学フィルムの製造方法及び光学フィルム用転写体の製造方法
JP6175973B2 (ja) * 2013-08-20 2017-08-09 大日本印刷株式会社 光学フィルム、画像表示装置、光学フィルム用転写体、光学フィルムの製造方法及び光学フィルム用転写体の製造方法
JP2015079230A (ja) 2013-09-10 2015-04-23 住友化学株式会社 積層体の製造方法
KR102481313B1 (ko) * 2016-07-21 2022-12-23 스미또모 가가꾸 가부시끼가이샤 타원 편광판
JP6662992B2 (ja) * 2018-05-25 2020-03-11 住友化学株式会社 円偏光板の製造方法
CN110531457B (zh) * 2018-05-25 2022-07-29 住友化学株式会社 圆偏振板的制造方法

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