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WO2004090592A1 - Procede de fabrication de plastifie optique, y compris le plastifie optique, une plaque de polarisation verticale, une plaque de polarisation circulaire et une unite d'affichage a cristaux optiques - Google Patents

Procede de fabrication de plastifie optique, y compris le plastifie optique, une plaque de polarisation verticale, une plaque de polarisation circulaire et une unite d'affichage a cristaux optiques Download PDF

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Publication number
WO2004090592A1
WO2004090592A1 PCT/JP2004/004990 JP2004004990W WO2004090592A1 WO 2004090592 A1 WO2004090592 A1 WO 2004090592A1 JP 2004004990 W JP2004004990 W JP 2004004990W WO 2004090592 A1 WO2004090592 A1 WO 2004090592A1
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WO
WIPO (PCT)
Prior art keywords
liquid crystal
crystal material
material layer
substrate
layer
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2004/004990
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English (en)
Japanese (ja)
Inventor
Tetsuya Uesaka
Kenji Hosaki
Haruyoshi Sato
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eneos Corp
Original Assignee
Nippon Oil Corp
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 Corp filed Critical Nippon Oil Corp
Publication of WO2004090592A1 publication Critical patent/WO2004090592A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133528—Polarisers
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3016—Polarising elements involving passive liquid crystal elements
    • 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
    • G02B5/3041—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 comprising multiple thin layers, e.g. multilayer stacks
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods

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 and viewing angle compensation for liquid crystal display devices. It has excellent performance as an optical element and as an optical rotatory optical element, contributing to higher performance and lighter weight 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 often used in layers. For example, 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 Broadband 1Z 4 wavelength plate by laminating 1/4 wavelength plate and 1/4 wavelength plate in plate, or broadband circularly polarizing plate by laminating cholesteric films having different selective wavelength regions, etc. .
  • 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 excellent optical functions it is a manufacturing method for laminating an optical element composed of at least two or more liquid crystal material layers on one supporting substrate film.
  • the present invention was finally completed.
  • the first aspect of the present invention is as follows: (1) After bonding a liquid crystal material layer 1 formed on an alignment substrate and having a fixed liquid crystal alignment to an isotropic substrate via an adhesive layer 1, The first step of peeling the substrate and transferring the liquid crystal material layer 1 to the isotropic substrate to obtain a laminate (A) composed of the isotropic substrate Z adhesive layer 1 and the Z liquid crystal material layer 1;
  • the second aspect of the present invention relates to the method for producing an optical laminate described above, wherein the liquid crystal material layer 1 and the liquid crystal material layer 2 have the same or different optical parameters.
  • 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 butyl group, a (meth) acryloyl group, a vinyloxy group, an epoxy group, an oxetanyl group, a carboxyl group, a hydroxyl group, an amino group, an isocyanate group, 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 substances include polyester, polyamide, polycarbonate, polyimide, polyurethane, polybenzimidazole, polybenzoxazole, polybenzthiazole, polyazomethine, Polyester amide, polyester Examples thereof include a liquid crystal material of a polymer such as a carbonate type or a polyesterimide type, or a mixture thereof.
  • a linear or cyclic skeleton chain such as a polyacrylate, polymethacrylate, polybutyl, polysiloxane, polyether, polymalonate, or polyester is used.
  • 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, light, or the like in the liquid crystal material may be blended within a range that does not hinder the expression of liquid crystallinity.
  • 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 formed by a method such as coating on an alignment substrate.
  • the coating film applied on the alignment substrate is dried, heat-treated (liquid crystal alignment), and, if necessary, irradiated with light and heated or heated (polymerization, crosslinking). 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.
  • a surfactant, an antifoaming agent, a leveling agent and the like may be added to the solution in order to form a uniform coating film on the alignment substrate.
  • 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 ⁇ , preferably from 0.2 ⁇ to 20 ⁇ , 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-orienting ability inherent to the liquid crystal material by heating the liquid crystal phase to the temperature range in which the liquid crystal phase appears.
  • Conditions for the heat treatment cannot be determined unconditionally because the optimum conditions and limit values differ depending on the liquid crystal phase behavior temperature (transition temperature) of the liquid crystal substance to be used. 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, polyether ketone, polyester ether ketone, polyether sulfone, polysulfone, polyethylene terephthalate, and polyethylene naphthalate. And polyarylate, triacetyl cellulose, epoxy resin, phenol resin and the like.
  • these films show a sufficient alignment ability for the liquid crystal substance used in the present invention without a treatment for expressing the alignment ability again, but the alignment ability is insufficient or
  • these films are stretched under appropriate heating, the film surface is rubbed in one direction with a rayon cloth or the like, so-called rubbing treatment is performed, and polyimide, polyvinyl alcohol is applied on the film.
  • a rubbing treatment is performed by providing an alignment film made of a known alignment agent such as a silane coupling agent, a film obliquely vapor-depositing silicon oxide or the like, or a film exhibiting a directivity by appropriately combining them. 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 alignment treatment is performed in an oblique direction as necessary. It is desirable to be done.
  • lamination with the MD of the long film aligned (so-called roll-to-roll) Bonding) or the efficiency of product picking up is extremely advantageous.
  • the adhesive used in the present invention has sufficient adhesive strength to the liquid crystal material layer, the isotropic substrate, and the removable substrate, and can peel the removable substrate in a later step. Yes, as long as the optical properties of the liquid crystal material layer are not impaired, and there is no particular limitation.
  • acrylic resin, methacrylic resin, epoxy resin, ethylene-vinyl acetate copolymer, rubber, urethane , Polyvinyl ether type and their mixture type, and various types such as thermosetting type and Z or photocuring type, electron beam curing type Reactive ones can be mentioned.
  • These adhesive layers 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.
  • the reaction (curing) conditions of the reactive substances vary depending on the components constituting the adhesive, the viscosity, the reaction temperature, and the like. Therefore, conditions suitable for each may be selected.
  • a photocuring type various known photoinitiators are preferably added, and 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, a synchrotron radiation light source, or the like is used.
  • the reaction may be carried out by irradiating light from the substrate.
  • 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. However, this is not the case if the absorption region of the photoinitiator and the spectrum of the light source are significantly different, or if the reactive compound itself has the ability to absorb the light source wavelength. In these cases, an appropriate photosensitizer or a method of using 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 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 as described above, but is usually l to 50 / zm, preferably 2 to 30 / m, and more preferably It is 3 to 10 ⁇ m. 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. Water-soluble surfactants, oil-soluble surfactants, polymer surfactants, fluorosurfactants, organometallic surfactants such as silicones, and reactive surfactants can be used.
  • a fluorosurfactant such as a perfluoroalkyl compound or a perfluoropolyether compound, or an organometallic surfactant such as silicone is particularly preferable because of its large surface modifying effect.
  • the amount of the surface modifier added is preferably in the range of 0.1 to 10% by mass, more preferably 0.05 to 5% by mass, and still more preferably 0.1 to 3% by mass, based on the adhesive. It is. 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, polyethenoresnoreon, polyphenylene sulfide, polyarylate, amorphous polyolefin, norbornene resin, Each film such as triacetyl cellulose or epoxy resin can be used.
  • Examples of the removable substrate used in the present invention include polyethylene, polypropylene, olefinic resins such as 4-methylpentene-11 resin, polyamide, polyimide, polyamide, polyetherimide, polyetherketone. , Polyetheretherketone, polyethersulfone, polyketonesanolesulfide, polysolephone, polystyrene, polyphenylene sulfide, polyphenylene sulfide, polyethylene terephthalate, polybutylene terephthalate, polyarylate, polyacetal, uniaxially stretched polyester , Polycarbonate, polybutyl alcohol, polymethyl methacrylate, polyarylate, amorphous polyolefin, norbornene resin, triacetyl cellulose, or Film such as an epoxy resin can be used.
  • olefinic resins such as 4-methylpentene-11 resin
  • polyamide polyimide
  • polyamide polyamide
  • polyetherimide polyetherimide
  • polyetherketone polyethersul
  • a transparent and optically isotropic film which is excellent in inspecting optical defects is preferable, and 4-methylpentene-11, polymethylmeta exemplified as an isotropic substrate is preferable.
  • These plastic films can be coated with silicone on their surfaces in advance or have an organic thin film or an inorganic thin film formed thereon in order to have 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 with the adhesive is usually 0.38 to 12 NZm, preferably 0.38 to NZm. Desirably 8.0 N / m.
  • the peeling force is lower than this value, the peeling force is too low when the oriented substrate is peeled off after the liquid crystal material layer on the oriented substrate is bonded to the removable substrate, and the peelable substrate may float.
  • the transfer of the liquid crystal material layer to the removable substrate becomes insufficient, and when the peeling force is too high, the removable substrate is peeled. In such a case, it is not preferable because the liquid crystal material layer is broken or peeling cannot be performed at an interface with a desired layer.
  • the thickness of the re-peelable substrate may affect the releasability, and is preferably 16 to 100 m, particularly preferably 25 to 50 / m. If the thickness is too thick, If the film is too thin, the mechanical strength of the film cannot be maintained, which may cause a problem such as tearing during production.
  • 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.
  • a commercially available thin film type is desirable. Specifically, a hydrophilic polymer film composed of polyvinyl alcohol (PVA), a PVA-based polarizing film such as partially acetalized PVA, a partially saponified ethylene-vinyl acetate copolymer, or the like is used.
  • a polarizing film stretched by adsorbing elemental and / or dichroic dyes a polarizing film made of a polyene oriented film such as a dehydrated PVA or a dehydrochlorinated polyvinyl chloride, and the like 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 transparent plastic film such as polyester or triacetyl cellulose laminated directly or via an adhesive layer, a resin coating layer, and a photocurable resin layer such as an acrylic or epoxy resin. It is. When these transparent protective layers are coated on both sides of the polarizing film, the same transparent protective layer may be provided on both sides, or different transparent protective layers may be provided. Next, the method for producing the optical laminate of the present invention will be specifically described.
  • 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 1 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 1.
  • the alignment substrate is peeled off. In this manner, 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 bonded to the isotropic substrate via the adhesive layer 1 can be obtained.
  • the liquid crystal material layer 1 in the laminate (A) may be provided with a transparent protective layer on the exposed liquid crystal material layer or a surface protective film to protect the surface of the liquid crystal material layer.
  • the material of the transparent protective layer can be selected from the aforementioned adhesives.
  • 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 1 has the following structure:
  • z represents the interface between the layers, and will be similarly described below.
  • a liquid crystal material coating film is formed on the alignment substrate by an appropriate method, the solvent is removed if necessary, and the liquid crystal alignment is completed by heating or the like. At least, the orientation of the liquid crystal material layer 2 is fixed by means suitable for the liquid crystal material used.
  • an adhesive layer 2 is formed on the liquid crystal material layer 2 having the fixed orientation, and the liquid crystal material layer 2 and the removable substrate are brought into close contact with each other via the adhesive layer 2. After reacting (curing), the alignment substrate is peeled off.
  • the liquid crystal material layer 2 having the fixed orientation can be transferred to the removable substrate.
  • a laminate (B) composed of the liquid crystal material layer 2 bonded on the removable substrate via the adhesive layer 2 can be obtained.
  • the liquid crystal material layer 2 in the laminate (B) may be provided with a transparent protective layer on the exposed liquid crystal material layer or bonded with a surface protective film to protect the surface of the liquid crystal material layer.
  • the material of the transparent protective layer can be selected from the aforementioned adhesives. That is, the layer structure of the laminate (B) composed of the liquid crystal material layer 2 formed on the removable substrate of the present invention via an adhesive layer has the following structure:
  • 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 layers 1 and 2 can be arbitrarily selected according to the releasability and required characteristics, and may be the same or different.
  • the laminate (A) and the laminate (B) are bonded together via an adhesive / adhesive (adhesive or adhesive) layer, and the releasable substrate Z adhesive layer 2 Z liquid crystal material layer 2 / pressure-sensitive adhesive (adhesive) layer Liquid crystal material layer 1
  • Adhesive layer 1 / laminate (C) consisting of isotropic substrate is obtained.
  • the releasable substrate of the laminate (C) is peeled off, and a polarizing plate is bonded to the peeled surface via a sticky / adhesive layer, or the laminate (C) isotropically
  • the optical laminate of the present invention can be obtained by laminating a polarizing plate to the substrate via a viscous adhesive layer and peeling the removable substrate of the laminate (C).
  • the polarizing plate when a polarizing plate is bonded to the isotropic substrate side, the polarizing plate may be bonded after the removable substrate is peeled off, or the removable substrate may be bonded after the polarizing plate is bonded. It may be peeled off.
  • an optical laminate having the following configuration can be obtained, for example, through at least the above steps.
  • Adhesive layer 2 Liquid crystal material layer 2 / Adhesive (adhesive) layer Z Adhesive layer 1 'Liquid crystal material layer 1 / Adhesive layer 1 Isotropic substrate
  • the liquid crystal material layer whose orientation is fixed on the alignment substrate, or the liquid crystal material layer transferred onto the re-peelable substrate is connected via an adhesive layer or an adhesive layer. It is also possible to laminate a plurality of liquid crystal material layers by repeating the operation of peeling the alignment substrate after lamination.
  • an adhesive with a release film is provided on the opposite surface of the oriented substrate or on the opposite surface of the removable substrate so that the oriented substrate or the removable substrate remains on one surface.
  • the release film of the pressure-sensitive adhesive can be treated as a new removable substrate.
  • the pressure-sensitive adhesive can be used not only as a pressure-sensitive adhesive for laminating the optical laminate of the present invention or for laminating with a liquid crystal cell or other optical members, but also for a bonding surface.
  • the degree of freedom in manufacturing can be further expanded, for example, by turning the top and bottom arbitrarily.
  • the release layer can be provided between the liquid crystal material layer and another layer. It is also possible to form. By forming the release layer, a stress blocking effect can be obtained to suppress a change in the appearance of the thin liquid crystal material layer during manufacturing or an environmental test (for example, ripples).
  • the release layer is not particularly limited, but is preferably an optically isotropic transparent layer, for example, an acrylic, methacrylic, or nitrocellular layer. Examples thereof include polymers such as loin-based and epoxy-based compounds and mixtures thereof.
  • the thickness of the release layer is from 0.3 ⁇ um to 40 ⁇ or less, preferably from 0.5 ⁇ m to 10 ⁇ m, and the glass transition point (T g) is 20 ° C or more,
  • the material is not particularly limited as long as it is an optically isotropic transparent layer of preferably 50 ° C. or higher and 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 effect is insufficient, and it is not preferable because the purpose of thinning which is a part of the object of the present invention is not met.
  • the physical properties of the release 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 release layer is not particularly limited.
  • a material which will be a release layer having the above-mentioned film thickness is previously coated on a removable substrate film such as polyethylene, polypropylene, or polyethylene terephthalate.
  • 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 compensating plate for a transmission or reflection type 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 type.
  • the liquid crystal material layer in which the hybrid nematic alignment is fixed is seen from the front.
  • the TN type can be used as a retardation film or a wave plate by using the retardation of the TN, and the asymmetry due to the direction of the retardation value (tilt of the molecular axis in the film thickness direction). It can also be used as a viewing angle improving member for liquid crystal display devices.
  • the liquid crystal material layer having the function of a 14-wave plate can be used as a circularly polarizing plate, a reflection type liquid crystal display device, an anti-reflection filter of an EL display device, or the like by being combined with a polarizing plate as in the present invention.
  • a 14-wavelength plate in which the phase difference of birefringent light of 550 nm monochromatic light is approximately 14 wavelengths is required. It is effective to stack a 1Z2 wavelength plate whose phase difference between birefringent light of monochromatic light of 550 nm is approximately 1Z2 wavelength in a state where their slow axes cross each other.
  • the retardation value of the 1Z4 wave plate is usually 50 nm to 180 nm, preferably 70 nm to 160 nm, particularly preferably 90 nm to: I 50 nm. is there.
  • the retardation value of the 12 wavelength plate is usually 180 nm to 320 nm, preferably 200 ⁇ ! Up to 300 nm, particularly preferably 220 nm! 280 nm. If the retardation range of the 14-wavelength plate and the 1-wavelength plate is out of the range described 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, and the like. It can be used for various anti-counterfeiting elements and decorative films utilizing the color change of the reflected light due to the viewing angle caused by the selective reflection ability.
  • the present invention will be described in more detail with reference to Examples and Comparative Examples, taking the production of a circular polarizing plate as an example.
  • the present invention is not limited to these.
  • 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 (64 mass ratio) mixed solvent: 30 ° C) of 0.16 d1 Zg, has a nematic phase as a liquid crystal phase, and isotropic.
  • the phase-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 liquid crystal material layer 2
  • UV-curable adhesive (UV-3400, manufactured by Toagosei Co., Ltd.) having a thickness of 5 im was used. Is applied as an adhesive layer 1 on which triacetium, a 40 ⁇ m-thick isotropic substrate, is applied. A cellulose (TAC) film 1 (manufactured by Fuji Photo Film Co., Ltd.) was laminated, and the adhesive layer 1 was cured by UV irradiation of about 60 OmJ.
  • TAC cellulose
  • the TAC film 1 adhesive layer 1 Z liquid crystal material layer 1 Z The polyimide film is peeled off from the laminated body in which the polyimide film is integrated, so that the liquid crystal material layer 1 is an isotropic substrate TAC film.
  • the resultant was transferred onto the substrate 1 to obtain a laminate (A) composed of the TAC film 1 / the adhesive layer 1 and the liquid crystal material layer 1.
  • the An of the laminate (A) was 140 nm.
  • UV-curable adhesive (UV-3400, manufactured by Toagosei Co., Ltd.) was applied on the liquid crystal material layer 2 (the surface opposite to the polyimide film) obtained in Preparation Example to a thickness of 5 / zm. Is applied as an adhesive layer 2, and a 25 m-thick removable substrate, polyethylene terephthalate (PET) film 2 (S10, manufactured by Toray Industries, Inc.) is laminated on the adhesive layer 2.
  • PET polyethylene terephthalate
  • the PET film 2Z adhesive layer 2 Liquid crystal material layer 2 The polyimide film is peeled from the laminated body of the polyimide film to transfer the liquid crystal material layer 2 onto the PET film 2 which is a removable substrate
  • a laminate (B) composed of the PET film 2, the adhesive layer 2 and the Z liquid crystal material layer 2 was obtained.
  • ⁇ nd of the laminate (B) when the PET film 2 was peeled off was 280 nm.
  • UV-curable adhesive (UV-3400) is applied on the liquid crystal material layer 1 of the laminate (A) (the surface opposite to the TAC film 1) to a thickness of 5 ⁇ m. Then, the surface of the liquid crystal material layer 2 of the laminate (B) was laminated thereon, and the adhesive layer 3 was cured by UV irradiation of about 600 mJ. By peeling the PET film 2 from this laminate, a laminate composed of a TAC film 1 adhesive layer 1 liquid crystal material layer 1 Z adhesive layer 3 / liquid crystal material layer 2 adhesive layer 2 was obtained.
  • a polarizing plate (thickness: about 105 m; Sumitomo Chemical Co., Ltd. 50 ⁇ ⁇ -062) having a 25 / m-thick pressure-sensitive adhesive layer previously formed on one side of the adhesive layer 2 of the laminate is pasted.
  • a circularly polarizing plate of the present invention comprising the polarizing plate adhesive layer Z adhesive layer 2 liquid crystal material layer 2 adhesive layer 3 liquid crystal material layer 1 Z adhesive layer 1 ZTAC film 1 was obtained.
  • the total thickness of the circularly polarizing plate was 195 ⁇ m.
  • a commercially available uniaxially stretched polycarbonate film 1 (thickness 60 ⁇ , ⁇ nd 1 35 nm) and polycarbonate film 2 (thickness 60 ⁇ , And 270 nm) are bonded together using a 25 ⁇ m adhesive to form a polycarbonate film.
  • a laminate composed of 1 pressure-sensitive adhesive layer / polycarbonate film 2 was obtained.
  • a polarizing plate (thickness: about 105 ⁇ ; SQW-062 manufactured by Sumitomo Chemical Co., Ltd.) having a 25 ⁇ m pressure-sensitive adhesive layer formed on one surface in advance on two sides of the polycarbonate of the laminate, is laminated.
  • One side of a commercially available uniaxially stretched norbornene-based film 1 was coated with a 25 ⁇ m-thick adhesive layer previously formed on a silicone-treated PET film. Pasted. Subsequently, a polarizing plate (thickness: about 105; SQW-062 manufactured by Sumitomo Chemical Co., Ltd.) in which a 25 ⁇ m-thick adhesive layer was previously formed on one side of the surface of the film on which the adhesive was not bonded was used. By laminating, a laminate composed of a polarizing plate Z adhesive layer / norbornene-based film 1 adhesive layer silicone-treated PET film was obtained.
  • the silicone-treated PET film of the laminate is peeled off, and a commercially available uniaxially stretched norbornene-based film 2 (thickness 8 ⁇ , Andl 30 nm; one ton manufactured by JSR Corporation) is bonded.
  • a circularly polarizing plate composed of the pressure-sensitive adhesive layer Z-norbornene-based film 1 and the pressure-sensitive adhesive layer Z-norbornene-based film 2 was obtained.
  • the total thickness of the circularly polarizing plate was as thick as 315 / m.
  • the circularly polarizing plate obtained in Example 1 was bonded to the upper and lower sides of a liquid crystal cell of a commercially available transflective TFT liquid crystal display using an adhesive, and the display characteristics were evaluated. Also, the display was good in both the reflection mode and the transmission mode. Further, the display device is 1 Two types of durability tests were performed: 600 ° C, 90% RH for 50,000 hours, 2 800 ° C, dry for 50,000 hours. Both appearance abnormalities such as peeling and cracking were observed. Not at all.
  • the present invention it is possible to establish an industrial production method in which at least two or more liquid crystal material layers are laminated on one supporting substrate film. Conventionally, it has been difficult to form a laminate using only a stretched polymer film. It has extremely high industrial value, such as the ability to obtain a new optical laminated body that achieves both high functionality of optical characteristics and significant thinning.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Polarising Elements (AREA)
  • Liquid Crystal (AREA)

Abstract

Un procédé de fabrication d'un plastifié d'élément optique composé de couches de cristaux liquides exemptes de n'importe quel substrat de support optique consiste en ce qui suit: (1) préparer un stratifié (A) qui comprend une couche substrat / un adhésif isotrope (1) / une couche de substance à cristaux liquides (1); (2) préparé un plastifié (B) qui comprend une couche détachable substrat / adhésif (2) / une couche de substance à cristaux liquides (2); (3) coller ensemble le plastifié (A) et le plastifié (B) en utilisant une couche adhésive (un adhésif) sensible à la pression et obtenir un plastifié (C) qui comprend une couche détachable substrat / adhésif (2) / une couche de substance à cristaux liquides (2) / une couche adhésive (un adhésif) sensible à la pression (1) / une couche adhésive (1) / un substrat isotrope; et (4) détacher le substrat amovible du plastifié (C) et lier une plaque de polarisation à la couche adhésive (2) ou lier une plaque de polarisation au substrat isotrope du plastifié et détacher le substrat amovible.
PCT/JP2004/004990 2003-04-07 2004-04-07 Procede de fabrication de plastifie optique, y compris le plastifie optique, une plaque de polarisation verticale, une plaque de polarisation circulaire et une unite d'affichage a cristaux optiques Ceased WO2004090592A1 (fr)

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JP2003-102920 2003-04-07
JP2003102920A JP2004309771A (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

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US20090176077A1 (en) * 2006-03-31 2009-07-09 Dai Nippon Printing Co., Ltd. Optical layered body
JP2008209666A (ja) * 2007-02-27 2008-09-11 Nitto Denko Corp 光学積層体の製造方法、及び画像表示装置
JP5021387B2 (ja) * 2007-07-19 2012-09-05 日東電工株式会社 積層体の製造方法
JP5209252B2 (ja) * 2007-08-13 2013-06-12 日東電工株式会社 積層体の製造方法
JP5304939B1 (ja) 2012-05-31 2013-10-02 大日本印刷株式会社 光学積層体、偏光板、偏光板の製造方法、画像表示装置、画像表示装置の製造方法及び画像表示装置の視認性改善方法
JP2015079230A (ja) 2013-09-10 2015-04-23 住友化学株式会社 積層体の製造方法
JP2014130357A (ja) * 2014-01-06 2014-07-10 Nitto Denko Corp 積層光学フィルム、液晶パネル、および液晶表示装置
WO2020179434A1 (fr) * 2019-03-05 2020-09-10 住友化学株式会社 Stratifié

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JPH09101515A (ja) * 1995-10-06 1997-04-15 Sharp Corp 液晶表示装置
JPH11293252A (ja) * 1998-04-10 1999-10-26 Nippon Mitsubishi Oil Corp コレステリック液晶性積層体
JP2000309195A (ja) * 1999-04-27 2000-11-07 Nippon Mitsubishi Oil Corp 転写用素子
JP2002182036A (ja) * 2000-04-06 2002-06-26 Fujitsu Ltd 視角補償フィルム及び液晶表示装置
JP2002214440A (ja) * 2002-02-13 2002-07-31 Nitto Denko Corp 液晶配向フィルムの製造方法、液晶配向フィルム、光学フィルムおよび画像表示装置

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