WO2004036274A1 - 液晶フィルムおよび楕円偏光板の製造方法 - Google Patents
液晶フィルムおよび楕円偏光板の製造方法 Download PDFInfo
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- WO2004036274A1 WO2004036274A1 PCT/JP2003/012961 JP0312961W WO2004036274A1 WO 2004036274 A1 WO2004036274 A1 WO 2004036274A1 JP 0312961 W JP0312961 W JP 0312961W WO 2004036274 A1 WO2004036274 A1 WO 2004036274A1
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- Prior art keywords
- liquid crystal
- film
- substrate
- material layer
- crystal material
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- 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
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- 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
Definitions
- the present invention relates to a method for producing a liquid crystal film and an elliptically polarizing plate useful for various optical elements.
- Thin films (films) composed of an alignment layer of a liquid crystal compound are elements for color compensation and viewing angle compensation for liquid crystal display devices. Also, it has excellent performance as an optical rotatory optical element, etc., and contributes to high performance and light weight of various display elements.
- a method for producing these films a method has been proposed in which a layer composed of a liquid crystal substance formed on an alignment substrate is transferred onto a light-transmitting substrate also serving as a support substrate (Japanese Patent Application Laid-Open No. 570/1990). No. 17, JP-A-4-1777216).
- the layer made of the liquid crystal material aligned on the alignment substrate is temporarily transferred to the removable substrate via an adhesive, and then the removable substrate is separated. It becomes possible to manufacture an optical element comprising a liquid crystal material layer without a supporting substrate film.
- the present inventors have proposed a production method using a uniaxially stretched polyester film as a re-peelable substrate in order to satisfy the mechanical strength and good releasability required at the time of production, and at the same time, to facilitate the detection of optical defects.
- a patent application was filed for (Japanese Patent Application No. 2001-31 306).
- An object of the present invention is to solve the above-mentioned problems, and to facilitate the detection of optical defects and to improve the peelability at the time of peeling in a method for producing a thinned liquid crystal film without a supporting substrate film.
- saponified triacetyl cellulose film satisfies the mechanical strength and good peelability required during manufacturing, and at the same time, inspection of optical defects. They have found that they can be done easily and have finally arrived at the present invention.
- a liquid crystal material layer in which the alignment of liquid crystal on an alignment substrate is fixed is bonded to a removable substrate made of a saponified triacetyl cellulose film via an adhesive.
- a method for producing a liquid crystal film comprising: separating an alignment substrate, transferring a liquid crystal substance layer to a removable substrate, and then removing the removable substrate.
- the liquid crystal material layer in which the alignment of the liquid crystal on the alignment substrate is fixed is adhered to a removable substrate made of a saponified triacetyl cellulose film via an adhesive.
- the method comprises producing an elliptically polarizing plate, comprising peeling the alignment substrate, transferring the liquid crystal material layer to a removable substrate, peeling the removable substrate, and then attaching a polarizing plate.
- the liquid crystal material layer on which the alignment of the liquid crystal on the alignment substrate is fixed is bonded to the first removable substrate via an adhesive, and then the alignment substrate is separated.
- liquid crystal The material layer is transferred to the first removable substrate, and then bonded to a second removable substrate made of a saponified triacetyl cellulose film via an adhesive, and then the first removable substrate is attached. And transferring the liquid crystal material layer to a second removable substrate, and then removing the second removable substrate.
- the liquid crystal material layer in which the alignment of the liquid crystal on the alignment substrate is fixed is bonded to the first removable substrate via an adhesive, and then the alignment substrate is separated.
- the liquid crystal material layer is transferred to the first removable substrate, and then adhered to the second removable substrate made of the saponified triacetyl cellulose film via an adhesive, and then the first removable substrate is attached.
- a method of manufacturing an elliptically polarizing plate comprising: peeling a non-conductive substrate, transferring a liquid crystal material layer to a second removable substrate, peeling the second removable substrate, and then bonding a polarizing plate. , Concerning.
- the present invention will be described in detail.
- the liquid crystal material layer in which the orientation of the liquid crystal used in the present invention is fixed is a layer 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) atalyloyl group, a bieroxy group, an epoxy group, an oxetanyl group, a carbonyl group, a hydroxyl group, an amino group, an isocyanate group, and an acid anhydride.
- the reaction is performed in a manner appropriate for each group.
- 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.
- the liquid crystal phase of the liquid crystal material layer before immobilization includes a nematic phase, a twisted nematic phase, a cholesteric phase, a hybrid nematic phase, a hybrid twisted nematic phase, a discotic nematic phase, a smectic phase, and the like.
- 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 side chain type polymer liquid crystal substance has a linear or cyclic structure skeleton chain such as a polyatalylate-based, polymethacrylate-based, polyvinyl-based, polysiloxane-based, polyether-based, polymalonate-based, or polyester-based.
- liquid crystal material examples include a polymer liquid crystal material in which a mesogen group is bonded as a side chain to a substance, or a mixture thereof.
- 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 oxycarboxylic acids, Schiff bases, bisazomethine compounds, azo compounds, azoxy compounds, and Examples thereof include a compound having liquid crystallinity in which the reactive functional group is introduced into a terminal such as a xanester compound and a sterol compound, and a composition in which a crosslinkable compound is added to a compound having liquid crystallinity among the compounds. .
- the discotic liquid crystal compound include a triphenylene-based compound and a torxene-based compound.
- 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.
- 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, methylethyl / ketone And ketones such as isophorone, butoxyshethyl alcohol, hexyloxyshethenole alcohol, ethenoleanole cornoles such as methoxy 2-propanol, glycol ethers such as ethylene glycol / resin methine oleatene, and diethylene glycol dimethyl ether.
- Esters such as ethyl, ethyl acetate, methoxypropyl acetate, and ethyl lactate; phenols such as phenol, black phenol; N, N-dimethylformamide; N, N-dimethylacetamide; N-methylpyrrolidone; Do system, black mouth Holm, Tet Black hole ethanone down, halogenated hydrocarbons such or a mixture of these systems, such as dichlorobenzene are used properly preferred. Further, 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. Further, 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 0.1 ⁇ m to 50 ⁇ m, preferably 0.2 0m to 20 ⁇ m. Outside this range, the optical performance of the obtained liquid crystal material layer becomes insufficient, and the orientation of the liquid crystal material becomes insufficient, which is not preferable.
- 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.
- the conditions for the heat treatment cannot be unequivocally determined because the optimum conditions and limit values differ depending on the liquid crystal phase behavior temperature (transition temperature) of the liquid crystal substance used, but it is usually 10 to 300, preferably 30 to 2 In the range of 50 ° C is there. 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, polyetherenoketone, polyetheretherenoketone, polyethersnolephone, polysenolephone, polyethylene terephthalate, and polyethylene.
- Films such as naphthalate, polyarylate, triacetate / recellulose, epoxy resin and phenol resin can be exemplified.
- 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 orientation film made of a known orientation agent such as a silane coupling agent, a film obliquely vapor-depositing silicon oxide or the like, or a film exhibiting orientation ability 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 liquid crystal material layer formed on the alignment substrate is bonded to the removable substrate via an adhesive.
- This adhesive has sufficient adhesive strength to the liquid crystal material layer and the removable substrate, and is capable of peeling the removable substrate in a later step.
- These adhesives include those having the function of a transparent protective layer for protecting the liquid crystal material layer. Note that a pressure-sensitive adhesive can also 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 in the range of 1 to 200 mJ, preferably 10 to 100 mJ as the integrated irradiation amount. However, this is not the case when the absorption region of the photoinitiator and the spectrum of the light source are significantly different, or when the reactive compound itself has the ability to absorb the light source wavelength. In these cases, an appropriate photosensitizer or a 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 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 ⁇ , preferably 3 to 30 ⁇ . Outside of this range, the adhesive strength is insufficient, and bleeding from the end is not preferred.
- these adhesives may be added with various fine particles or 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 compatibility with the adhesive is good, and the curability and the hardness of the adhesive are good. It is not particularly limited as long as it does not affect the optical performance after the formation, and includes ionic and nonionic water-soluble surfactants, oil-soluble surfactants, polymer surfactants, fluorosurfactants, silicones, etc. Organometallic surfactants, reactive surfactants and the like 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 addition amount of the surface modifier is preferably in the range of 0.01 to 10% by mass, more preferably 0.05 to 5% by mass, and still more preferably 0.1 to 3% by mass with respect to 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.
- a saponified triacetylcellulose (TAC) film is used as the removable substrate.
- TAC saponified triacetyl cellulose
- T AC saponified triacetyl cellulose
- the following films can be used as the first removable substrate. That is, polyethylene resin, polypropylene, olefin resin such as 4-methylpentene_1 resin, polyamide, polyamide, polyamide, polyamide, polyetherimide, polyetherketone, polyetheretherketone, polyethersulfone, and polyketonesulfide.
- a plastic film such as polyolefin, triacetyl cellulose or epoxy resin can be used. 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. For the same purpose, the surface of the plastic film may be subjected to chemical treatment or physical treatment such as corona treatment.
- a lubricant or a surface modifier may be contained.
- the type and amount of the lubricant are not particularly limited as long as they do not adversely affect the detectability 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 detectability of optical defects deteriorates, which is not preferable.
- 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, fluorinated surfactants, organometallic surfactants such as silicone, 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 addition amount of the surface modifier is preferably in the range of 0.01 to 10% by mass, more preferably 0.05 to 5% by mass, and still more preferably 0.1 to 3% by mass with respect to the adhesive. % 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 adhesive strength may occur.
- the surface modifier may be used alone or, if necessary, in combination of two or more kinds.
- 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 (180 ° peeling, peeling speed Degree of 30 cmZ at room temperature) is usually 0.38 to 12 N / m, preferably 0.38 to 8.0 Nm.
- 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. And the transfer of the liquid crystal material layer to the removable substrate becomes insufficient, and if the peeling force is too high, the removable substrate is peeled off. In this case, it is not preferable because the liquid crystal material layer is destroyed or peeling cannot be performed at an interface with a desired layer.
- the thickness of the removable substrate may affect the releasability, preferably 16 to 100 / im, more preferably 25 to 50 ⁇ m. If the thickness is too large, the release points may not be stable and the releasability 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 problems such as tearing during production. .
- the saponified triacetyl cellulose film used in the present invention will be described.
- the alkali added to the aqueous solution used for the saponification treatment include sodium hydroxide, potassium hydroxide, lithium hydroxide, calcium hydroxide and the like.
- the degree of saponification treatment can be controlled by the alkali concentration, the immersion temperature, and the immersion time of the alkaline aqueous solution. Conditions for more efficient saponification treatment are usually about 5 to 30% by weight as the alkali concentration, 30 to 70 ° C as the immersion temperature, and 30 seconds to 1 as the immersion time. The process is performed under the condition of about 0 minutes. After immersion in an alkaline aqueous solution, wash with water and dry. Note that a neutralization treatment with about 1 N hydrochloric acid or the like may be performed before water washing.
- the degree of the saponification treatment can be estimated by, for example, the contact angle with water, and the treatment is preferably performed until the contact angle becomes 40 degrees or less, preferably 30 degrees or less. If the saponification treatment is insufficient, the adhesion between the triacetyl cellulose film and the adhesive becomes too strong, and the triacetyl cellulose film may not be peeled off properly during the manufacturing process.
- the contact angle means a static contact angle
- the measuring method of the contact angle is 20 ° C using a contact angle meter (manufactured by Kyowa Interface Science Co., Ltd., automatic contact meter CA-Z type).
- the film thickness may affect the releasability, as in the case of the removable substrate described above, preferably 16 to 100 ⁇ m, and particularly preferably. 25 to 50 ⁇ is good. If the thickness is too thick, the peeling point may not be stable and the peelability may be deteriorated. On the other hand, if the thickness is too thin, the mechanical strength of the film may not be maintained, and there may be a problem such as tearing during production.
- One of the methods for producing a liquid crystal film according to the present invention is to bond a liquid crystal material layer having liquid crystal alignment fixed on an alignment substrate to a removable substrate made of a saponified triacetyl cellulose film via an adhesive. After that, the oriented substrate is peeled off, the liquid crystal material layer is transferred to the removable substrate, and then the removable substrate is peeled off.
- the method for producing the liquid crystal film is not particularly limited, but as an example, it can be produced by the following method.
- a liquid crystal material coating film is formed on an alignment substrate by an appropriate method, the solvent or the like is removed as necessary, and the liquid crystal alignment is completed by heating or the like. Fix the orientation of the liquid crystal material layer.
- an adhesive layer is formed on the liquid crystal material layer in which the orientation is fixed, and the releasable substrate made of the saponified triacetyl cellulose film is adhered to the liquid crystal material layer via the adhesive layer. After reacting (curing) the adhesive layer if necessary, the alignment substrate is peeled off.
- liquid crystal material layer having the fixed orientation can be transferred to a removable substrate made of a saponified triacetyl cellulose film.
- a liquid crystal film is obtained by obtaining a laminate composed of a liquid crystal material layer adhered to the removable substrate via an adhesive in this way, and then peeling the removable substrate. is there. Thus, a liquid crystal film is manufactured.
- a transparent protective layer may be provided on the exposed liquid crystal material layer or a surface protective film may be bonded for protecting the surface of the liquid crystal material layer.
- the transparent protective layer may be selected from the above-mentioned adhesives.
- Another method of manufacturing a liquid crystal film according to the present invention is to bond a liquid crystal material layer having a fixed liquid crystal orientation on an alignment substrate to a first removable substrate via an adhesive. Thereafter, the alignment substrate was peeled off, the liquid crystal material layer was transferred to the first removable substrate, and then bonded to a second removable substrate made of a saponified triacetyl cellulose film via an adhesive.
- the first removable substrate is peeled off, the liquid crystal material layer is transferred to the second removable substrate (saponified TAC film), and then the second removable substrate is peeled off. It is assumed that.
- the first removable substrate can be arbitrarily selected from the aforementioned removable substrates.
- the liquid crystal material layer formed on the saponified triacetyl cellulose film can easily detect an optical defect as it is.
- the saponified triacetyl cellulose film is peeled off, the liquid crystal material layer is not broken due to poor peeling or peeling at other interfaces does not occur, and a good peeling state can be obtained.
- the method for detecting optical defects is not particularly limited, but the absorption axes of the two polarizing plates are arranged in the orthogonal direction, and a laminated film composed of a saponified triacetyl cellulose film and a liquid crystal material layer is interposed therebetween.
- a method of arranging and irradiating white light from the lower part of the polarizing plate and visually observing it from the opposite direction, an automatic method using a line camera, and the like are included.
- the absorption axis of the polarizing plate is not necessarily arranged orthogonally, but at an arbitrary angle so that optical defects can be easily detected. Can also be set to
- a transparent protective layer may be provided on the exposed liquid crystal material layer or a surface protective film may be bonded for protecting the surface of the liquid crystal material layer.
- the transparent protective layer may be selected from the above-mentioned adhesives.
- the liquid crystal material layer in which the alignment of the liquid crystal on the alignment substrate is fixed is bonded to a removable substrate made of a saponified triacetyl cellulose film via an adhesive, and then the alignment substrate is fixed. Then, the liquid crystal material layer is transferred to a removable substrate, and then the polarizing plate is attached to a liquid crystal film obtained by peeling the removable substrate to produce an elliptically polarizing plate.
- a liquid crystal material layer in which the alignment of the liquid crystal on the alignment substrate is fixed After adhering to the first removable substrate via an adhesive, the alignment substrate is released, the liquid crystal material layer is transferred to the first removable substrate, and the saponified tria is then applied via the adhesive. After bonding to the second removable substrate made of cetylcellulose film, the first removable substrate is peeled off, and the liquid crystal material layer is converted to the second removable substrate (saponified TAC film).
- An elliptically polarizing plate is manufactured by attaching a polarizing plate to a liquid crystal film obtained by transferring and then peeling the second removable substrate.
- the surface of the liquid crystal film to which the polarizing plate is adhered is not particularly limited, and may be on the side of the alignment substrate separation surface or on the side of the first removable substrate.
- the attachment surface of the polarizing plate can be appropriately selected depending on the use, the production process, and the like.
- the elliptically polarizing plate of the present invention may include one or more layers of an antireflection layer, an antiglare treatment layer, a hard coat layer, and a light diffusion layer, in addition to the polarizing plate and the liquid crystal film.
- the adhesive or the like used for laminating or bonding to the polarizing plate is not particularly limited as long as it is an optical grade.
- a suitable adhesive from the above-mentioned adhesives can be used.
- the polarizing plate used for the elliptically polarizing plate of the present invention is not particularly limited as long as the object of the present invention can be achieved, and a polarizing plate usually used for a liquid crystal display device can be appropriately used.
- a thin film type recently developed in recent years is desirable.
- a hydrophilic polymer film composed of a PVA-based polarizing film such as polyvinyl alcohol (PVA) or partially acetalized PVA, a partially saponified ethylene monoacetate copolymer, and / or the like, is doped with iodine and / or oxygen.
- a polarizing film stretched by adsorbing a dichroic dye a polarizing film composed of a polyene oriented film such as a dehydrated product of PVA or a dehydrochlorinated product of polychlorinated vinyl, and the like can be used. Further, a reflective polarizing film can also be used.
- the polarizing plate may be used alone or may be provided with a transparent protective layer on one or both sides of the polarizing film for the purpose of improving strength, improving moisture resistance, improving 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.
- the saponified triacetyl cellulose film Before or after peeling off the saponified triacetyl cellulose film in the above manufacturing process, the saponified triacetyl cellulose film is bonded or adhered to another optically anisotropic film, and if necessary. By peeling, various optical elements having a liquid crystal film can be obtained.
- the liquid crystal material layer formed on the saponified triacetyl cellulose film before lamination with the optically anisotropic film can easily detect optical defects in the laminated state as it is. Is possible.
- a plurality of the above-mentioned various films and layers may be laminated, and the same surface, for example, the liquid crystal material layers may be laminated via an adhesive if necessary.
- liquid crystal film of the present invention for example, a nematic alignment, a liquid crystal film having a twisted nematic alignment fixed functions as a retardation film,
- Liquid crystal films with fixed cholesteric and smectic orientations include polarizing reflective films for improving brightness, reflective color filters, various anti-counterfeiting elements that make use of the color change of reflected light due to the viewing angle due to selective reflection. It can be used for decorative films.
- a film in which the nematic hybrid orientation is fixed can be used as a retardation film or a wave plate using the retardation when viewed from the front, and the orientation of the retardation value (in the film thickness direction).
- a liquid crystal film having a quarter-wave plate function can be used in combination with a polarizing plate as a circularly polarizing plate, an anti-reflection filter of a reflection type liquid crystal display device or an EL display device, or the like.
- the present invention is very difficult when a normal removable substrate is used. It is very easy to detect optical defects such as foreign matter, bright spots, and color unevenness in the liquid crystal material layer, and to obtain good peelability of the removable substrate. This can be achieved very easily by using a saponified triacetylcellulose film as the removable substrate. [Best Mode for Carrying Out the Invention]
- the logarithmic viscosity of this liquid crystalline polyester (Polymer 1) (Phenol Z tetrachloroethane (6/4 mass ratio) mixed solvent: 30 ° C) is 0.16 d 1 g, having 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.
- a commercially available UV-curable adhesive (UV-340, manufactured by Toagosei Co., Ltd.) was applied at 5 / zm. (Adhesive layer 1), and a 40 ⁇ thick saponified triacetyl cellulose film (hereinafter referred to as a saponified TAC film) is laminated thereon as a removable substrate.
- the adhesive layer 1 was cured by UV irradiation of about 60 OmJ.
- TAC film a triacetyl cellulose film
- a commercially available film (trade name “Fujitac”, manufactured by Fuji Photo Film Co., Ltd.) was used, and the contact angle of water after saponification was 20 degrees.
- the saponified TAC film / adhesive layer 1 and the liquid crystal material layer 1 are peeled off from the laminate of the Z polyimide film to transfer the liquid crystal material layer 1 onto the saponified TAC film, which is a removable substrate. Liquid crystal film laminate 1 was obtained.
- the absorption axes of the two polarizing plates are arranged in the orthogonal direction, and a 14-inch size liquid crystal film laminate 1 is placed between them.
- a white fluorescent lamp was used as a light source from underneath, and foreign substances, scratches and other defects in the liquid crystal film laminate 1 were visually observed from the opposite direction.
- the time required for inspection of the liquid crystal film laminate 1 was 11 seconds.
- an adhesive layer 1 of about 25 ⁇ with a separate film was laminated.
- the saponified TAC film was peeled off from the laminate of the saponified TAC film / adhesive layer 1Z liquid crystal material layer 1 / adhesive layer 1Z separate film.
- the peeling force between the saponified TAC film and the adhesive layer 1 was 2.4 N / m.
- a polarizing plate (about 180 ⁇ m thick; Sumitomo Chemical Co., Ltd.) is provided on the surface of the adhesive layer 1 of the obtained adhesive layer 1 / liquid crystal material layer 1 / adhesive layer 1 / separate film laminate. SQ-1 8 5 2AP)) is laminated through a 25 ⁇ adhesive layer 2, and a polarizing plate adhesive layer 2 adhesive layer 1 / liquid crystal material layer 1 adhesive layer:
- An elliptically polarizing plate composed of a laminated body having a film shape was obtained.
- the peelability of the saponified TAC film was extremely good, and the normality at the interface with the saponified TAC adhesive layer 1 Peeling was possible.
- Example 1 was repeated except that unsaponified TAC film (trade name “Fujitac”, manufactured by Fuji Photo Film Co., Ltd., thickness 40 ⁇ ) was used instead of saponified TAC.
- Saponified TAC film ⁇ Adhesive layer 1Z Liquid crystal material layer 1 / Liquid crystal film is peeled off from the laminate of polyimide film to transfer liquid crystal material layer 1 onto unsaponified TAC film, and liquid crystal film laminate 2 Got.
- the time required for inspection of the liquid crystal film laminate 2 was 10 seconds. '
- Polycarbonate film / adhesive layer 1 Liquid crystal was prepared in the same manner as in Example 1 except that a saponified TAC was replaced by a 50 ⁇ m-thick polycarbonate (manufactured by Kaneka Chemical Co., Ltd.). Material layer 1 The liquid crystal material layer 1 was transferred onto a polycarbonate film by peeling the polyimide film from the laminate of the polyimide film, and a liquid crystal film laminate 3 was obtained. As a result of observing optical defects of the liquid crystal film laminate 3 in the same manner as in Example 1, the defect could be easily inspected without being affected by the removable substrate. At this time, the time required for inspection of the liquid crystal film laminate 3 was 12 seconds.
- an adhesive layer 1 of about 25 / im with a separate film was laminated.
- the polycarbonate film was peeled off from the laminate of the polycarbonate film / adhesive layer 1Z liquid crystal material layer 1 / adhesive layer 1Z separate film.
- the peeling force between the polycarbonate film and the adhesive layer 1 was 26 NZm, which was very heavy, and the peeling interface became cloudy.
- the liquid crystal film laminate 3 during the manufacturing process had good detectability, the peelability of the polycarbonate film was poor, and the normal peeling portion peeling off at the interface between the polycarbonate film and the adhesive layer 1 was poor.
- the area was about 10% of the whole area.
- Example 1 a biaxially stretched polyethylene terephthalate having a thickness of 50 im (hereinafter, polyethylene terephthalate is referred to as PET) film (trade name: “T60”, manufactured by Toray Industries, Inc.) was used instead of saponified TAC. Except for using, the same procedure as in Example 1 was carried out. ⁇ 60 PET film ⁇ Adhesive layer 1 Z liquid crystal material layer 1 Z The liquid crystal material layer 1 was peeled off from the polyimide film laminate to remove liquid crystal material layer 1 from T. The resultant was transferred onto a 60 PET film to obtain a liquid crystal film laminate 4.
- PET polyethylene terephthalate having a thickness of 50 im
- Example 1 instead of the saponified TAC film, a silicone-coated biaxially stretched PET film having a thickness of 38 m (trade name “# 52”, manufactured by Teijin Limited) (hereinafter referred to as a # 52 PET film). ) was carried out in the same manner as in Example 1 except that the polyimide film was peeled off from the laminate of # 52 PET film adhesive layer 1 / liquid crystal material layer 1 / polyimide film to remove liquid crystal material layer 1. # 52 Transferred onto PET film.
- a UV curable adhesive (UV-1400) is applied to a thickness of 5 ⁇ on the exposed surface of the liquid crystal material layer 1 of the obtained laminate (adhesive layer 2), and a second re-peeling is performed thereon.
- a 40 m thick saponified TAC film (trade name “Fujitac”, contact angle of water after saponification is 15 degrees) is laminated, and the adhesive layer 2 is irradiated by UV irradiation of about 60 OmJ.
- the # 52 PET film was peeled off from the laminate to obtain a liquid crystal film laminate 5 composed of an adhesive layer 1, a liquid crystal material layer 1, a Z adhesive layer 2, and a saponified TAC film.
- the defect could be easily inspected without being affected by the removable substrate.
- the time required for inspection of the liquid crystal film laminate 5 was 9 seconds.
- the saponified T AC film was peeled from the body.
- the peel force between the saponified T AC film and the adhesive layer 2 was 2.5 NZm.
- a polarizing plate (thickness of about 180 ⁇ ; Sumitomo Chemical Co., Ltd.) is provided on the surface of the obtained adhesive layer 2 liquid crystal material layer 1 / adhesive layer 1 adhesive layer 1 adhesive layer 2 of the laminate of the separate film. (SQ-1852APj) manufactured by Co., Ltd. was laminated through a 25 ⁇ m adhesive layer 2, and a polarizing plate / adhesive layer 2 adhesive layer 2 / liquid crystal material layer 1 Z adhesive layer 1 Adhesive layer 1 An elliptically polarizing plate composed of a laminate in which the noseparate film was integrated was obtained, and the detection of optical defects of the liquid crystal film laminate 1 during the manufacturing process was good. In addition, the peelability of the saponified TAC film was extremely good, and normal peeling at the interface between the saponified TAC film and the adhesive layer 2 was possible.
- Example 2 Bonding was performed in the same manner as in Example 2 except that unsaponified TAC film (“Fujitac”, thickness 40 ⁇ ) was used in place of the saponified TAC film as the second removable substrate in Example 2.
- unsaponified TAC film (“Fujitac”, thickness 40 ⁇ ) was used in place of the saponified TAC film as the second removable substrate in Example 2.
- Liquid Crystal Material Layer 1 / Liquid Crystal Material Layer 1 / Adhesive Layer 2 Unsaponifiable Liquid crystal film laminate 6 comprising a TAC film was obtained.
- the defect could be easily inspected without being affected by the removable substrate.
- the time required for the inspection of the liquid crystal film laminate 6 was 11 seconds.
- the liquid crystal film laminate 6 during the manufacturing process had good testability, but the peelability of the unsaponifiable TAC film was very poor, and the liquid crystal film laminate 6 was normal at the interface between the unsaponifiable TAC film and the adhesive layer 2. No exfoliated part was obtained.
- Example 2 Example 2 was repeated except that saponified TAC was replaced with a 50 ⁇ thick acrylic resin film (trade name “Ataliprene”, manufactured by Mitsubishi Rayon Co., Ltd.) as the second removable substrate. The same operation as in Example 2 was performed to obtain a liquid crystal film laminate 7 composed of the adhesive layer 1 ⁇ the liquid crystal material layer 1, the adhesive layer 2 ⁇ / ataliprene.
- a 50 ⁇ thick acrylic resin film trade name “Ataliprene”, manufactured by Mitsubishi Rayon Co., Ltd.
- the defect could be easily inspected without being affected by the removable substrate.
- the time required for inspection of the liquid crystal film laminate 7 was 12 seconds.
- the liquid crystal film laminate 7 during the manufacturing process had good testability, but the peelability of ataliprene was very poor, and a normal peeled portion was obtained at the interface between ataliprene and the adhesive layer 2. Did not.
- Example 2 was repeated except that the saponified TAC was replaced with a 50 / Zm-thick PET film (trade name “S10”, manufactured by Toray Industries, Inc.) in place of the sacrificed TAC in Example 2.
- a 50 / Zm-thick PET film (trade name “S10”, manufactured by Toray Industries, Inc.) in place of the sacrificed TAC in Example 2.
- the same procedure as in Example 2 was carried out to obtain a liquid crystal film laminate 8 composed of an adhesive layer 1 / a liquid crystal material layer 1Z an adhesive layer 2 / S10 PET film.
- Table 1 summarizes the results of Examples 1 and 2 and Comparative Examples 1 to 6.
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- Chemical & Material Sciences (AREA)
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Abstract
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| Application Number | Priority Date | Filing Date | Title |
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| JP2002-301458 | 2002-10-16 | ||
| JP2002301458A JP2004138697A (ja) | 2002-10-16 | 2002-10-16 | 液晶フィルムおよび楕円偏光板の製造方法 |
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| PCT/JP2003/012961 Ceased WO2004036274A1 (ja) | 2002-10-16 | 2003-10-09 | 液晶フィルムおよび楕円偏光板の製造方法 |
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| JP (1) | JP2004138697A (ja) |
| KR (1) | KR20050084850A (ja) |
| CN (1) | CN1313849C (ja) |
| WO (1) | WO2004036274A1 (ja) |
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| JP2007114270A (ja) * | 2005-10-18 | 2007-05-10 | Nippon Oil Corp | 光学フィルムの製造方法 |
| JP2008183812A (ja) * | 2007-01-30 | 2008-08-14 | Nippon Oil Corp | 液晶フィルムの製造方法および光学素子用積層フィルム |
| JP2015079230A (ja) | 2013-09-10 | 2015-04-23 | 住友化学株式会社 | 積層体の製造方法 |
| KR102508041B1 (ko) * | 2014-08-29 | 2023-03-08 | 스미또모 가가꾸 가부시키가이샤 | 광학 필름의 제조 방법 |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06308328A (ja) * | 1993-04-22 | 1994-11-04 | Nippon Petrochem Co Ltd | 光学素子 |
| JPH08278491A (ja) * | 1995-04-07 | 1996-10-22 | Nippon Oil Co Ltd | 液晶性高分子フィルムの製造方法 |
| JP2000347027A (ja) * | 1999-06-07 | 2000-12-15 | Nippon Mitsubishi Oil Corp | 転写用素子 |
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| JPH0726223A (ja) * | 1993-07-08 | 1995-01-27 | Dainippon Printing Co Ltd | 帯電防止性を有する微粘着高透明保護フィルム |
| JP4140998B2 (ja) * | 1997-12-22 | 2008-08-27 | 大日本印刷株式会社 | 拡散層付偏光板および当該偏光板を用いた液晶表示装置 |
-
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- 2002-10-16 JP JP2002301458A patent/JP2004138697A/ja active Pending
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- 2003-10-09 KR KR1020057006457A patent/KR20050084850A/ko not_active Ceased
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06308328A (ja) * | 1993-04-22 | 1994-11-04 | Nippon Petrochem Co Ltd | 光学素子 |
| JPH08278491A (ja) * | 1995-04-07 | 1996-10-22 | Nippon Oil Co Ltd | 液晶性高分子フィルムの製造方法 |
| JP2000347027A (ja) * | 1999-06-07 | 2000-12-15 | Nippon Mitsubishi Oil Corp | 転写用素子 |
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| Publication number | Publication date |
|---|---|
| CN1705899A (zh) | 2005-12-07 |
| CN1313849C (zh) | 2007-05-02 |
| KR20050084850A (ko) | 2005-08-29 |
| JP2004138697A (ja) | 2004-05-13 |
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