WO2022168509A1 - 偏光板および位相差層付偏光板 - Google Patents
偏光板および位相差層付偏光板 Download PDFInfo
- Publication number
- WO2022168509A1 WO2022168509A1 PCT/JP2021/048859 JP2021048859W WO2022168509A1 WO 2022168509 A1 WO2022168509 A1 WO 2022168509A1 JP 2021048859 W JP2021048859 W JP 2021048859W WO 2022168509 A1 WO2022168509 A1 WO 2022168509A1
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- WIPO (PCT)
- Prior art keywords
- polarizing plate
- polarizer
- protective layer
- epoxy resin
- resin
- Prior art date
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Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
-
- 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
-
- 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
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/80—Constructional details
- H10K59/8793—Arrangements for polarized light emission
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2329/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Derivatives of such polymer
- C08J2329/02—Homopolymers or copolymers of unsaturated alcohols
- C08J2329/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
Definitions
- the present invention relates to a polarizing plate and a polarizing plate with a retardation layer.
- a polarizing plate is often arranged on at least one side of a display cell in an image display device (for example, a liquid crystal display device, an organic EL display device) due to its image forming method.
- image display devices have become thinner and more flexible, and along with this, there is a strong demand for thinner polarizing plates.
- a conventional thin polarizing plate is applied to a flexible image display device, there is a problem that the adhesion of the polarizing plate is deteriorated and the followability of the polarizing plate to the curved surface is deteriorated.
- the present invention has been made to solve the above-mentioned conventional problems, and its main object is to provide a polarizing plate which is extremely thin but has excellent adhesion and curved surface conformability. It is in.
- the polarizing plate of the present invention includes a polarizer and protective layers disposed on both sides of the polarizer, the protective layers containing an epoxy resin having an aromatic skeleton and a diol skeleton, and having a glass transition temperature of is 40° C. or less, and the elongation amount of the polarizing plate during the puncture test is 1.40 mm or more.
- the polarizer is composed of a polyvinyl alcohol-based resin film containing a dichroic substance, and has an orientation function of 0.30 or less.
- the protective layer is composed of a photo-cationically cured product of the epoxy resin or a solidified coating film of an organic solvent solution of the epoxy resin.
- the total thickness of the polarizing plate is 20 ⁇ m or less.
- the polarizing plate has a puncture strength of 300 g or more.
- the protective layer has a glass transition temperature of 0° C. or higher.
- Another aspect of the present invention provides a polarizing plate with a retardation layer. This retardation layer-attached polarizing plate includes a retardation layer, the polarizer, and the protective layer.
- the protective layers disposed on both sides of the polarizer contain an epoxy resin having an aromatic skeleton and a diol skeleton, and have a glass transition temperature of 40° C. or less. Regardless, it is possible to obtain a polarizing plate having excellent adhesion and curved surface followability.
- FIG. 1 is a schematic cross-sectional view of a polarizer according to one embodiment of the invention.
- FIG. 1 is a schematic cross-sectional view of a polarizer according to one embodiment of the present invention.
- the illustrated polarizing plate 100 has a polarizer 10 and protective layers 20 and 30 disposed on both sides of the polarizer 10 .
- the polarizing plate 100 may be arranged on the viewing side of the display cell, or may be arranged on the side opposite to the viewing side (back side).
- the polarizing plate may be elongated or sheet-shaped. When the polarizing plate is elongated, it can preferably be wound into a roll.
- the polarizing plate has an adhesive layer as the outermost layer on one side, and can be attached to the display cell. If necessary, a surface protection film and/or a carrier film may be releasably attached to the polarizing plate to reinforce and/or support the polarizing plate.
- a separator is temporarily attached to the surface of the pressure-sensitive adhesive layer in a detachable manner to protect the pressure-sensitive adhesive layer until practical use and to allow the polarizing plate to be rolled.
- the protective layer contains an epoxy resin having an aromatic skeleton and a diol skeleton, and has a glass transition temperature of 40°C or lower. With such a configuration, it is possible to realize a polarizing plate having excellent adhesion and curved surface followability.
- the protective layer is preferably composed of a photo-cationically cured epoxy resin having an aromatic skeleton and a diol skeleton, or a solidified coating film of an organic solvent solution of the epoxy resin.
- the protective layer can be made very thin (for example, 10 ⁇ m or less).
- the protective layer can be formed directly on the polarizer (that is, without an adhesive layer or pressure-sensitive adhesive layer).
- the protective layer is very thin, and the adhesive layer or adhesive layer can be omitted, so the total thickness of the polarizing plate can be made extremely thin.
- the adhesion between the polarizer and the protective layer is excellent.
- the total thickness of the polarizing plate is preferably 20 ⁇ m or less, more preferably 15 ⁇ m or less, still more preferably 12 ⁇ m or less.
- the total thickness of the polarizing plate can be, for example, 4 ⁇ m or more.
- the polarizing plate has an elongation amount of 1.40 mm or more, preferably 1.60 mm or more, during a puncture test.
- a polarizing plate having excellent adhesion and curved surface followability can be obtained.
- the polarizing plate preferably has a puncture strength of 300 g or more, more preferably 340 g or more. If the puncture strength of the polarizing plate is within such a range, a polarizing plate with excellent adhesion and curved surface conformability can be obtained.
- the thickness of the polarizing plate can be extremely thin as described above. Therefore, it can be preferably applied to a flexible image display device. More preferably, the image display device has a curved shape (substantially a curved display screen) and/or is bendable or bendable. Specific examples of image display devices include liquid crystal display devices and electroluminescence (EL) display devices (eg, organic EL display devices and inorganic EL display devices). Needless to say, the above description does not prevent the polarizing plate of the present invention from being applied to ordinary image display devices.
- EL electroluminescence
- the polarizer and protective layer will be described in detail below.
- a polarizer is typically composed of a PVA-based resin film containing a dichroic substance.
- the resin film forming the polarizer may be, for example, a single-layer resin film or a laminate of two or more layers.
- the polarizer composed of a single-layer resin film include hydrophilic polymer films such as polyvinyl alcohol (PVA) films, partially formalized PVA films, and partially saponified ethylene/vinyl acetate copolymer films.
- hydrophilic polymer films such as polyvinyl alcohol (PVA) films, partially formalized PVA films, and partially saponified ethylene/vinyl acetate copolymer films.
- oriented polyene films such as those dyed with dichroic substances such as iodine and dichroic dyes and stretched, and dehydrated PVA and dehydrochlorinated polyvinyl chloride films.
- a polarizer obtained by dyeing a PVA-based film with iodine and uniaxially stretching the film is preferably used because of its excellent optical properties.
- the dyeing with iodine is performed, for example, by immersing the PVA-based film in an aqueous iodine solution.
- the draw ratio of the uniaxial drawing is preferably 3 to 7 times. Stretching may be performed after the dyeing treatment, or may be performed while dyeing. Moreover, you may dye after extending
- the PVA-based film is subjected to swelling treatment, cross-linking treatment, washing treatment, drying treatment, and the like. For example, by immersing the PVA-based film in water and washing it with water before dyeing, not only can dirt and anti-blocking agents on the surface of the PVA-based film be washed away, but also the PVA-based film can be swollen to remove uneven dyeing. can be prevented.
- the polarizer can typically be produced using a laminate of two or more layers.
- a specific example of a polarizer obtained using a laminate is a polarizer obtained using a laminate of a resin substrate and a PVA-based resin layer formed by coating on the resin substrate.
- a polarizer obtained by using a laminate of a resin base material and a PVA-based resin layer formed by coating on the resin base material is obtained, for example, by applying a PVA-based resin solution to the resin base material and drying the resin base material. forming a PVA-based resin layer thereon to obtain a laminate of a resin substrate and a PVA-based resin layer; stretching and dyeing the laminate to use the PVA-based resin layer as a polarizer; obtain.
- a polyvinyl alcohol-based resin layer containing a halide and a polyvinyl alcohol-based resin is formed on one side of the resin substrate.
- Stretching typically includes immersing the laminate in an aqueous boric acid solution for stretching.
- the stretching preferably further includes in-air stretching of the laminate at a high temperature (eg, 95° C. or higher) before stretching in an aqueous boric acid solution.
- the total draw ratio of the laminate is preferably 5.0 times or more, more preferably 5.5 times or more, relative to the original length of the laminate.
- an embodiment of the present invention that obtains a polarizer in this manner is referred to as embodiment A. Details of such a polarizer manufacturing method are described in, for example, Japanese Patent Application Laid-Open No. 2012-73580 (Patent No. 5414738) and Japanese Patent No. 6470455. The publication is incorporated herein by reference in its entirety.
- the total draw ratio of the laminate is preferably 3.0 to 4.5 times the original length of the laminate, which is significantly smaller than usual. Even with such a total draw ratio, a polarizer having acceptable optical properties can be obtained by a combination of halide addition and drying shrinkage treatment.
- the draw ratio of the in-air auxiliary drawing is preferably higher than the draw ratio of the boric acid aqueous drawing. More specifically, the ratio of the stretch ratio of the in-air auxiliary stretching to the stretch ratio of the underwater stretching (in-water stretching/in-air auxiliary stretching) is preferably 0.4 to 0.9, more preferably 0.5 to 0. .8.
- a method for manufacturing a polarizer includes subjecting a laminate to an in-air auxiliary stretching treatment, a dyeing treatment, an underwater stretching treatment, and a drying shrinkage treatment in this order. By introducing auxiliary stretching, it is possible to improve the crystallinity of the PVA-based resin even when the PVA-based resin is applied onto the thermoplastic resin, and to achieve high optical properties.
- the optical properties can be improved by shrinking the laminate in the width direction by drying shrinkage treatment.
- the obtained resin substrate/polarizer laminate may be used as it is (that is, the resin substrate may be used as a protective layer for the polarizer), or the resin substrate may be peeled off from the resin substrate/polarizer laminate. Then, any appropriate protective layer may be laminated on the release surface according to the purpose.
- an embodiment of the present invention that obtains a polarizer in this manner is referred to as embodiment B.
- the thickness of the polarizer is preferably 1 ⁇ m to 12 ⁇ m, more preferably 2 ⁇ m to 10 ⁇ m, still more preferably 3 ⁇ m to 8 ⁇ m.
- the polarizer preferably exhibits absorption dichroism at any wavelength of 380 nm to 780 nm.
- the single transmittance of the polarizer obtained in Embodiment A is preferably 42.0% to 46.0%, more preferably 44.5% to 46.0%.
- the degree of polarization of the polarizer is preferably 97.0% or higher, more preferably 99.0% or higher, still more preferably 99.9% or higher.
- the single transmittance of the polarizer obtained in Embodiment B is preferably 40.0% or more, more preferably 41.0% or more.
- the upper limit of single transmittance can be, for example, 49.0%.
- the single transmittance of the polarizer is 40.0% to 45.0% in Embodiment B, for example.
- the degree of polarization of the polarizer obtained in Embodiment B is preferably 99.0% or more, more preferably 99.4% or more.
- the upper limit of the degree of polarization can be, for example, 99.999%.
- the degree of polarization of the polarizer is, for example, 99.0% to 99.9% in embodiment B.
- the orientation function (f) of the PVA-based resin constituting the polarizer obtained in Embodiment B is preferably 0.30 or less, more preferably 0.25 or less, and still more preferably 0.20 or less. It is preferably 0.15 or less.
- a lower bound on the orientation function can be, for example, 0.05. An orientation function that is too small may not provide acceptable unitary transmission and/or degree of polarization.
- the orientation function (f) is determined by attenuated total reflection (ATR) measurement using a Fourier transform infrared spectrophotometer (FT-IR) and polarized light as measurement light.
- ATR attenuated total reflection
- FT-IR Fourier transform infrared spectrophotometer
- germanium is used for the crystallite to which the polarizer is attached, the incident angle of the measurement light is 45°, and the incident polarized infrared light (measurement light) is directed to the surface of the germanium crystal sample to which the sample is attached.
- Polarized light vibrating in parallel (s-polarized light) was measured with the stretching direction of the polarizer arranged parallel and perpendicular to the polarization direction of the measurement light, and the intensity at 2941 cm -1 of the obtained absorbance spectrum was measured. is calculated according to the following formula.
- the intensity I is a value of 2941 cm -1 /3330 cm -1 with 3330 cm -1 as a reference peak.
- the peak at 2941 cm ⁇ 1 is believed to be absorption due to vibration of the PVA main chain (—CH 2 —) in the polarizer.
- ⁇ Molecular chain angle with respect to the stretching direction
- ⁇ Transition dipole moment angle with respect to the molecular chain axis
- I ⁇ Absorption intensity when the polarization direction of the measurement light and the stretching direction of the polarizer are perpendicular
- I // Absorption intensity when the polarization direction of the measurement light and the stretching direction of the polarizer are parallel
- the PVA-based resin that constitutes the PVA-based resin film preferably contains an acetoacetyl-modified PVA-based resin.
- a polarizer having a desired puncture strength can be obtained.
- the amount of the acetoacetyl-modified PVA-based resin is preferably 5-20% by weight, more preferably 8-12% by weight, when the total PVA-based resin is 100% by weight. .
- the protective layer contains an epoxy resin having an aromatic skeleton and a diol skeleton.
- the epoxy resin protective layer is preferably composed of a photo-cationically cured epoxy resin having an aromatic skeleton and a diol skeleton, or a solidified coating film of an organic solvent solution of the epoxy resin.
- a photo-cationically cured epoxy resin having an aromatic skeleton and a diol skeleton By including an epoxy resin having an aromatic skeleton and a diol skeleton in the protective layer, it is possible to obtain a polarizing plate that is extremely thin but has excellent adhesion and curved surface conformability.
- the protective layer is more preferably a photo-cationically cured epoxy resin having an aromatic skeleton and a diol skeleton.
- the constituent components of the protective layer will be specifically described, and then the properties of the protective layer will be described.
- Examples of the aromatic skeleton in the epoxy resin include a bisphenol A-type skeleton, a bisphenol F-type skeleton, and a biphenyl skeleton. More specifically, bisphenol A type epoxy resin, bisphenol F type epoxy resin, bisphenol S type epoxy resin, biphenyl type epoxy resin, naphthalene ring-containing epoxy resin, epoxy resin having a dicyclopentadiene skeleton, phenol novolac type resin, cresol Examples include novolac type epoxy resins, triphenylmethane type epoxy resins, aliphatic epoxy resins, and copolymer epoxy resins of aliphatic epoxy resins and aromatic epoxy resins.
- F-type epoxy resin bisphenol S-type epoxy resin, biphenyl-type epoxy resin, and naphthalene ring-containing epoxy resin are preferable, and bisphenol A-type epoxy resin, bisphenol F-type epoxy resin, naphthalene ring-containing epoxy resin, and biphenyl-type epoxy resin are more preferable. Used.
- the diol skeleton preferably contains an aliphatic skeleton having 2 to 6 carbon atoms. More specific examples include 1,4-butanediol, 1,6-hexanediol, 1,4-naphthalenediol, 1,6-naphthalenediol and the like. 6-hexanediol is preferably used.
- the epoxy resin has a glass transition temperature (Tg) of 40°C or lower, preferably 35°C or lower.
- Tg of the protective layer is 40° C. or lower, preferably 35° C. or lower.
- the lower limit of the glass transition temperature (Tg) of the epoxy resin is preferably 0°C. If the glass transition temperature (Tg) of the epoxy resin is in such a range, a polarizing plate with excellent adhesion and curved surface followability can be obtained. On the other hand, if the glass transition temperature (Tg) of the epoxy resin is less than 0°C, the epoxy resin may become sticky.
- epoxy resin and other resins may be used together. That is, a blend or copolymer of an epoxy resin and another resin may be used for forming the protective layer.
- other resins include thermoplastic resins such as styrene resins, polyethylene, polypropylene, polyamide, polyphenylene sulfide, polyetheretherketone, polyester, polysulfone, polyphenylene oxide, polyacetal, polyimide, and polyetherimide.
- the type and blending amount of the resin to be used in combination can be appropriately set according to the purpose and desired properties of the resulting film.
- the content of the epoxy resin with respect to the total of the epoxy resin and the other resin is preferably 50% to 100% by weight, more preferably 60% to 100% by weight, More preferably 70% to 100% by weight, particularly preferably 80% to 100% by weight. If the content is less than 50% by weight, the protective layer may not have sufficient heat resistance and sufficient adhesion to the polarizer.
- Epoxy resins can be cured by being used with any appropriate curing agent. Any suitable curing agent capable of curing the epoxy resin can be used as the curing agent.
- the curing agent comprises a photocationic polymerization initiator. By including a photocationic polymerization initiator, a protective layer that is a cationic polymerization cured product can be formed.
- the photocationic polymerization initiator any suitable compound capable of curing an epoxy resin having an aromatic skeleton and a diol skeleton by irradiation with light such as ultraviolet rays can be used. Only one type of photocationic polymerization initiator may be used, or two or more types may be used in combination.
- photocationic polymerization initiators include triphenylsulfonium hexafluoroantimonate, triphenylsulfonium hexafluorophosphate, p-(phenylthio)phenyldiphenylsulfonium hexafluoroantimonate, p-(phenylthio)phenyldiphenylsulfonium hexafluorophosphate, 4-chlorophenyldiphenylsulfonium hexafluorophosphate, 4-chlorophenyldiphenylsulfonium hexafluoroantimonate, bis[4-(diphenylsulfonio)phenyl]sulfide bishexafluorophosphate, bis[4-(diphenylsulfonio)phenyl ] sulfide bishexafluoroantimonate, (2,4-cyclopentadien-1-yl)[
- a triphenylsulfonium salt-based hexafluoroantimonate-type photocationic polymerization initiator and a diphenyliodonium salt-based hexafluoroantimonate-type photocationic polymerization initiator are used.
- a commercially available product may be used as the photocationic polymerization initiator.
- Commercially available products include triphenylsulfonium salt-based hexafluoroantimonate type SP-170 (manufactured by ADEKA), CPI-101A (manufactured by San-Apro), WPAG-1056 (manufactured by Wako Pure Chemical Industries, Ltd.), diphenyliodonium salt-based Hexafluoroantimonate type WPI-116 (manufactured by Wako Pure Chemical Industries, Ltd.) and the like can be mentioned.
- the content of the photocationic polymerization initiator is preferably 0.1 to 3 parts by weight, more preferably 0.25 to 2 parts by weight, relative to 100 parts by weight of the epoxy resin. If the content of the photocationic polymerization initiator is less than 0.1 parts by weight, it may not be sufficiently cured even when irradiated with light (ultraviolet rays).
- the protective layer contains an epoxy resin having an aromatic skeleton and a diol skeleton. Further, the protective layer is preferably composed of a photo-cationically cured epoxy resin having an aromatic skeleton and a diol skeleton, or a solidified coating film of an organic solvent solution of the epoxy resin. Such a cured product or solidified product can be much thinner than an extruded film.
- the thickness of the protective layer is preferably 10 ⁇ m or less, more preferably 7 ⁇ m or less, still more preferably 5 ⁇ m or less, and particularly preferably 3 ⁇ m or less.
- the thickness of the protective layer can be, for example, 1 ⁇ m or more.
- the protective layer which is a cured epoxy resin having an aromatic skeleton and a diol skeleton, has excellent adhesion to the polarizer. Therefore, even with the thickness as described above, the polarizer can be protected to the same extent as a protective layer using a conventional film.
- the protective layer may contain any appropriate additive depending on the purpose.
- additives include ultraviolet absorbers; leveling agents; antioxidants such as hindered phenol, phosphorus, and sulfur; stabilizers such as light stabilizers, weather stabilizers, and heat stabilizers; Reinforcing materials such as carbon fiber; Near-infrared absorbers; Flame retardants such as tris(dibromopropyl) phosphate, triallyl phosphate, and antimony oxide; Antistatic agents such as anionic, cationic, and nonionic surfactants; Inorganic pigments , organic pigments, colorants such as dyes; organic fillers or inorganic fillers; resin modifiers; organic fillers or inorganic fillers; plasticizers; Additives are usually added to the solution during the formation of the protective layer. The type, number, combination, addition amount, etc. of additives can be appropriately set according to the purpose.
- the present invention includes a polarizing plate with a retardation layer having the above polarizing plate.
- a polarizing plate with a retardation layer according to an embodiment of the present invention includes the above polarizing plate and a retardation layer.
- the optical properties of the retardation layer e.g., refractive index properties, in-plane retardation (Re), thickness direction retardation (Rth), wavelength dispersion properties
- number, combination, arrangement order, etc. are appropriately set according to the purpose. can be
- polarizer/resin substrate laminate As the resin substrate, a long amorphous isophthalic copolymerized polyethylene terephthalate film (thickness: 100 ⁇ m) having a water absorption rate of 0.75% and a Tg of about 75°C was used. was used. Corona treatment was applied to one side of the resin substrate. Polyvinyl alcohol (degree of polymerization: 4200, degree of saponification: 99.2 mol%) and acetoacetyl-modified PVA (manufactured by Mitsubishi Chemical Corporation, trade name "GOSEFIMER Z410”) were mixed at a ratio of 9:1 to 100 parts by weight of PVA-based resin.
- PVA aqueous solution (coating solution).
- the above PVA aqueous solution was applied to the corona-treated surface of the resin base material and dried at 60° C. to form a PVA-based resin layer having a thickness of 13 ⁇ m, thereby producing a laminate.
- the obtained laminate was uniaxially stretched 2.4 times at the free end in the machine direction (longitudinal direction) between rolls with different peripheral speeds in an oven at 130° C. (in-air auxiliary stretching treatment).
- the laminate was immersed in an insolubilizing bath (an aqueous boric acid solution obtained by mixing 4 parts by weight of boric acid with 100 parts by weight of water) at a liquid temperature of 40° C. for 30 seconds (insolubilizing treatment).
- an aqueous boric acid solution obtained by mixing 4 parts by weight of boric acid with 100 parts by weight of water obtained by mixing 4 parts by weight of boric acid with 100 parts by weight of water
- the finally obtained polarizer is added to a dyeing bath (iodine aqueous solution obtained by blending iodine and potassium iodide at a weight ratio of 1:7 with respect to 100 parts by weight of water) at a liquid temperature of 30 ° C. It was immersed for 60 seconds while adjusting the concentration so that the single transmittance (Ts) was 41.5% ⁇ 0.1% (dyeing treatment).
- the laminate was immersed in a washing bath (aqueous solution obtained by blending 4 parts by weight of potassium iodide with 100 parts by weight of water) at a liquid temperature of 20° C. (washing treatment). After that, while drying in an oven kept at 90° C., it was brought into contact with a heating roll made of SUS whose surface temperature was kept at 75° C. for about 2 seconds (drying shrinkage treatment). The shrinkage ratio in the width direction of the laminate due to the drying shrinkage treatment was 5.2%. In this manner, a polarizer having a thickness of 5 ⁇ m was formed on the resin base material to produce a laminate of polarizer/resin base material.
- the polarizer is hereinafter referred to as polarizer A.
- protective layer-forming composition 30 parts of an epoxy resin having an aromatic skeleton and a diol skeleton (“YX7105” manufactured by Mitsubishi Chemical Corporation) was dissolved in 67.6 parts of methyl ethyl ketone to obtain an epoxy resin solution. To the resulting epoxy resin solution, 2.4 parts of a cationic photopolymerization initiator (manufactured by San-Apro, trade name: CPI (registered trademark)-100P) was added to obtain a composition for forming a protective layer.
- a cationic photopolymerization initiator manufactured by San-Apro, trade name: CPI (registered trademark)-100P
- polarizing plate 2 Preparation of polarizing plate 2 .
- the protective layer-forming composition obtained in 1. was applied to the surface of the polarizer of the polarizing plate obtained above using a wire bar, and the coating film was dried at 60° C. for 3 minutes. Next, ultraviolet rays were irradiated using a high-pressure mercury lamp so that the integrated light amount was 600 mJ/cm 2 to form a protective layer.
- the protective layer had a thickness of 2 ⁇ m to 3 ⁇ m and a glass transition temperature (Tg) of 31°C.
- Tg glass transition temperature
- the protective layer is hereinafter referred to as protective layer A.
- a polarizing plate having a structure of protective layer A/polarizer A/protective layer A was obtained.
- the polarizing plate had an elongation of 1.44 mm, a strength of 344 g, and a thickness of 11 ⁇ m.
- the obtained polarizing plate was subjected to the evaluations (4) and (5) above. Table 1 shows the results.
- Example 2 Preparation of polarizer/resin substrate laminate
- a thermoplastic resin substrate an amorphous isophthalate-copolymerized polyethylene terephthalate film (thickness: 100 ⁇ m) was used. Corona treatment (treatment condition: 55 W ⁇ min/m 2 ) was applied to one side of the resin substrate.
- Polyvinyl alcohol degree of polymerization: 4,200, degree of saponification: 99.2 mol% and acetoacetyl-modified PVA (manufactured by Nippon Synthetic Chemical Industry Co., Ltd., trade name "GOSEFIMER Z410") mixed at 9:1: 100 weight of PVA-based resin 13 parts by weight of potassium iodide was added to 10 parts by weight to prepare a PVA aqueous solution (coating liquid).
- the above PVA aqueous solution was applied to the corona-treated surface of the resin base material and dried at 60° C. to form a PVA-based resin layer having a thickness of 13 ⁇ m, thereby producing a laminate.
- the obtained laminate was uniaxially stretched 2.4 times at the free end in the machine direction (longitudinal direction) between rolls with different peripheral speeds in an oven at 130° C. (in-air auxiliary stretching treatment).
- the laminate was immersed in an insolubilizing bath (an aqueous boric acid solution obtained by mixing 4 parts by weight of boric acid with 100 parts by weight of water) at a liquid temperature of 40° C. for 30 seconds (insolubilizing treatment).
- the finally obtained polarizer is added to a dyeing bath (iodine aqueous solution obtained by blending iodine and potassium iodide at a weight ratio of 1:7 with respect to 100 parts by weight of water) at a liquid temperature of 30 ° C.
- the polarizer will be referred to as polarizer B hereinafter.
- the orientation function of the resulting polarizer was 0.15.
- a polarizing plate having a structure of protective layer A/polarizer B/protective layer A was obtained in the same manner as in Example 1, except that the polarizer was prepared by the method described above.
- the polarizing plate had an elongation of 1.66 mm, a strength of 415 g, and a thickness of 12 ⁇ m.
- the obtained polarizing plate was subjected to the evaluations of (4) and (5) above. Table 1 shows the results.
- protective layer-forming composition 15 parts of an epoxy resin having a biphenyl skeleton (manufactured by Mitsubishi Chemical Corporation, trade name: jER (registered trademark) YX4000) was dissolved in 83.8 parts of methyl ethyl ketone to obtain an epoxy resin solution. To the resulting epoxy resin solution, 1.2 parts of a cationic photopolymerization initiator (manufactured by San-Apro, trade name: CPI (registered trademark)-100P) was added to obtain a composition for forming a protective layer.
- protective layer B the protective layer formed from the protective layer-forming composition.
- the glass transition temperature (Tg) of protective layer B was 106°C.
- a polarizing plate having a structure of protective layer B/polarizer A/protective layer B was obtained in the same manner as in Example 1, except that the protective layer-forming composition was prepared by the method described above.
- the polarizing plate had an elongation of 1.17 mm, a strength of 256 g, and a thickness of 11 ⁇ m.
- the obtained polarizing plate was subjected to the evaluations (4) and (5) above. Table 1 shows the results.
- Comparative example 2 A polarizing plate having a structure of protective layer B/polarizer B/protective layer B was obtained in the same manner as in Comparative Example 1, except that Polarizer B was obtained in the same manner as in Example 2.
- the polarizing plate had an elongation of 1.26 mm, a strength of 337 g, and a thickness of 12 ⁇ m.
- the obtained polarizing plate was subjected to the evaluations (4) and (5) above. Table 1 shows the results.
- Example 3 A polarizing plate having a structure of protective layer A/polarizer A was obtained in the same manner as in Example 1, except that the protective layer A was provided only on one side of the polarizer A.
- the elongation of the polarizing plate was 1.35 mm when the puncture test was performed from the protective layer side, and was 1.00 mm or less when the puncture test was performed from the polarizer side.
- the strength of the polarizing plate was 285 g when the puncture test was performed from the protective layer side, and was 100 g or less when the puncture test was performed from the polarizer side. Furthermore, the thickness of the polarizing plate was 8 ⁇ m.
- the obtained polarizing plate was subjected to the evaluations (4) and (5) above. Table 1 shows the results.
- Example 4 A polarizer A was produced in the same manner as in Example 1, but no protective layer was provided.
- the polarizer had an elongation of 1.00 mm or less, a strength of 100 g or less, and a thickness of 5 ⁇ m.
- the obtained polarizer was subjected to the evaluations of (4) and (5) above. Table 1 shows the results.
- Example 5 A polarizer B was produced in the same manner as in Example 2, but no protective layer was provided.
- the polarizer had an elongation of 1.38 mm, a strength of 267 g, and a thickness of 6 ⁇ m.
- the obtained polarizer was subjected to the evaluations of (4) and (5) above. Table 1 shows the results.
- Protective layer C / polarizer A / protective layer C in the same manner as in Example 1 except that an acrylic film (thickness 20 ⁇ m, glass transition temperature (Tg) 123 ° C., hereinafter referred to as protective layer C) was used as the protective layer.
- a polarizing plate having the structure of was obtained.
- the polarizing plate had an elongation of 1.00 mm or less, a strength of 500 g or more, and a thickness of 45 ⁇ m.
- the obtained polarizing plate was subjected to the evaluations (4) and (5) above. Table 1 shows the results.
- Comparative Example 7 A polarizing plate having a structure of protective layer C/polarizer A was obtained in the same manner as in Comparative Example 6, except that the protective layer C was formed only on one side of the polarizer A.
- the polarizing plate had an elongation of 1.00 mm or less, a strength of 500 g or more, and a thickness of 25 ⁇ m.
- the obtained polarizing plate was subjected to the evaluations (4) and (5) above. Table 1 shows the results.
- the polarizing plate of the present invention is suitable for use in image display devices.
- image display devices include mobile devices such as personal digital assistants (PDAs), smart phones, mobile phones, watches, digital cameras, and portable game machines; OA devices such as personal computer monitors, notebook computers, and copiers; video cameras, and televisions. , microwave ovens and other household electrical appliances; back monitors, car navigation system monitors, car audio and other automotive equipment; display equipment such as digital signage and information monitors for commercial stores; security equipment such as surveillance monitors; Nursing care and medical equipment such as medical monitors and medical monitors;
- PDAs personal digital assistants
- OA devices such as personal computer monitors, notebook computers, and copiers
- microwave ovens and other household electrical appliances back monitors, car navigation system monitors, car audio and other automotive equipment
- display equipment such as digital signage and information monitors for commercial stores
- security equipment such as surveillance monitors
- Nursing care and medical equipment such as medical monitors and medical monitors;
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Abstract
Description
1つの実施形態においては、上記偏光子は、二色性物質を含むポリビニルアルコール系樹脂フィルムで構成され、配向関数は0.30以下である。
1つの実施形態においては、上記保護層は、上記エポキシ樹脂の光カチオン重合硬化物、または、上記エポキシ樹脂の有機溶媒溶液の塗布膜の固化物で構成されている。
1つの実施形態においては、上記偏光板の総厚みは20μm以下である。
1つの実施形態においては、上記偏光板の突き刺し強度は300g以上である。
1つの実施形態においては、上記保護層のガラス転移温度は0℃以上である。
本発明の別の局面においては、位相差層付偏光板が提供される。この位相差層付偏光板は、位相差層と、上記偏光子と上記保護層と、を含む。
図1は、本発明の1つの実施形態による偏光板の概略断面図である。図示例の偏光板100は、偏光子10と、偏光子10の両側に配置された保護層20および30と、を有する。偏光板100は、画像表示装置に適用される場合、表示セルの視認側に配置されてもよく、視認側と反対側(背面側)に配置されてもよい。偏光板は、長尺状であってもよいし、枚葉状であってもよい。偏光板が長尺状である場合、好ましくは、ロール状に巻回可能である。
偏光子としては、任意の適切な偏光子が採用され得る。偏光子は、代表的には、二色性物質を含むPVA系樹脂フィルムで構成される。偏光子を形成する樹脂フィルムは、例えば、単層の樹脂フィルムであってもよく、二層以上の積層体であってもよい。
f=(3<cos2θ>-1)/2
=(1-D)/[c(2D+1)]
=-2×(1-D)/(2D+1)
ただし、
c=(3cos2β-1)/2で、2941cm-1の振動の場合は、β=90°である。
θ:延伸方向に対する分子鎖の角度
β:分子鎖軸に対する遷移双極子モーメントの角度
D=(I⊥)/(I//) (この場合、PVA分子が配向するほどDが大きくなる)
I⊥ :測定光の偏光方向と偏光子の延伸方向が垂直の場合の吸収強度
I// :測定光の偏光方向と偏光子の延伸方向が平行の場合の吸収強度
保護層は、芳香族骨格とジオール骨格とを有するエポキシ樹脂を含む。
保護層は、好ましくは、芳香族骨格とジオール骨格とを有するエポキシ樹脂の光カチオン重合硬化物、または、当該エポキシ樹脂の有機溶媒溶液の塗布膜の固化物で構成されている。保護層が芳香族骨格とジオール骨格を有するエポキシ樹脂を含むことにより、非常に薄いにもかかわらず、密着性に優れ、かつ、曲面追従性に優れた偏光板が得られ得る。さらに、保護層は、より好ましくは芳香族骨格とジオール骨格を有するエポキシ樹脂の光カチオン重合硬化物である。以下、保護層の構成成分について具体的に説明し、次いで、保護層の特性を説明する。
エポキシ樹脂は任意の適切な硬化剤と共に用いられることにより、硬化物となり得る。硬化剤としては、エポキシ樹脂を硬化させることができる任意の適切な硬化剤を用いることができる。1つの実施形態において、硬化剤は光カチオン重合開始剤を含む。光カチオン重合開始剤を含むことにより、カチオン重合硬化物である保護層を形成することができる。光カチオン重合開始剤としては、紫外線等の光照射により芳香族骨格とジオール骨格とを有するエポキシ樹脂を硬化させることかできる任意の適切な化合物を用いることができる。光カチオン重合開始剤は1種のみを用いてもよく、2種以上を組み合わせて用いてもよい。
保護層は、上記のとおり、芳香族骨格とジオール骨格とを有するエポキシ樹脂を含む。さらに、保護層は、好ましくは、芳香族骨格とジオール骨格とを有するエポキシ樹脂の光カチオン重合硬化物、または、当該エポキシ樹脂の有機溶媒溶液の塗布膜の固化物で構成されている。このような硬化物または固化物であれば、押出成形フィルムに比べて厚みを格段に薄くすることができる。保護層の厚みは、好ましくは10μm以下であり、より好ましくは7μm以下であり、さらに好ましくは5μm以下であり、特に好ましくは3μm以下である。保護層の厚みは、例えば1μm以上であり得る。芳香族骨格とジオール骨格とを有するエポキシ樹脂の硬化物である保護層は、偏光子との密着性に優れる。そのため、上記のような厚みであっても、従来のフィルムを用いた保護層と同程度に偏光子を保護し得る。
上記C項に記載の偏光板は、他の光学フィルムおよび/または光学部材との積層体として提供され得る。1つの実施形態においては、偏光板は、位相差フィルムとの積層体(位相差層付偏光板)として提供され得る。したがって、本発明は、上記偏光板を有する位相差層付偏光板を包含する。本発明の実施形態による位相差層付偏光板は、上記の偏光板と位相差層とを備える。位相差層の光学特性(例えば、屈折率特性、面内位相差(Re)、厚み方向の位相差(Rth)、波長分散特性)、数、組み合わせ、配置順序等は目的に応じて適切に設定され得る。
実施例または比較例で得られた偏光板または偏光子について、ニードルを装着した圧縮試験機(カトーテック社製、製品名「NDG5」、ニードル貫通力測定仕様)に載置し、室温(23℃±3℃)環境下、荷重5kgで突き刺した。該偏光板または偏光子が破断する際の伸び率(mm)および強度(g)を算出した。
(2)厚み
実施例または比較例で得られた偏光板または偏光子について、ダイヤルゲージ(PEACOCK社製、製品名「DG-205」、ダイヤルゲージスタンド(製品名「pds-2」))を用いて厚みを測定した。
(3)ガラス転移温度(Tg)
実施例または比較例で得られた保護層を短冊状に切り出した後、粘弾性スペクトロメータ(SIIナノテクノロジー社製、製品名「DMS6100」)を用いて、温度範囲-80℃~150℃、昇降温速度2℃/min、周波数1Hzの条件下で測定を行った。
(4)密着性
実施例および比較例で得られた偏光板から、偏光子の吸収軸方向に直交する方向および吸収軸方向をそれぞれ対向する二辺とする試験片(50mm×50mm)を切り出した。試験片の偏光子側表面に粘着剤を塗布し、ガラス板に貼り付けた。次いで、保護層(塗布膜の固化物)側表面にカッターナイフで10×10のマス目となるよう切り込みを入れ、粘着テープ(積水化学工業社製)を表面に貼り付けた。その後、粘着テープを剥離し、100のマス目のうち剥がれたマスの数を評価した。 良:マスの数が50以上 不良:マスの数が50未満
(5)曲面追従性
スマートフォンの角部を想定した治具をアクリル樹脂で作製し、実施例および比較例で得られた偏光板を湾曲部に追従させて手で引っ張り、偏光子にシワやクラックが入るかを目視で評価した。
良:シワやクラックやヒビが確認できなかった
不良:シワやクラックやヒビが確認された
1.偏光子/樹脂基材の積層体の作製
樹脂基材として、長尺状で、吸水率0.75%、Tg約75℃である、非晶質のイソフタル共重合ポリエチレンテレフタレートフィルム(厚み:100μm)を用いた。樹脂基材の片面に、コロナ処理を施した。
ポリビニルアルコール(重合度4200、ケン化度99.2モル%)およびアセトアセチル変性PVA(三菱ケミカル社製、商品名「ゴーセファイマーZ410」)を9:1で混合したPVA系樹脂100重量部に、ヨウ化カリウム13重量部を添加し、PVA水溶液(塗布液)を調製した。
樹脂基材のコロナ処理面に、上記PVA水溶液を塗布して60℃で乾燥することにより、厚み13μmのPVA系樹脂層を形成し、積層体を作製した。
得られた積層体を、130℃のオーブン内で周速の異なるロール間で縦方向(長手方向)に2.4倍に自由端一軸延伸した(空中補助延伸処理)。
次いで、積層体を、液温40℃の不溶化浴(水100重量部に対して、ホウ酸を4重量部配合して得られたホウ酸水溶液)に30秒間浸漬させた(不溶化処理)。
次いで、液温30℃の染色浴(水100重量部に対して、ヨウ素とヨウ化カリウムを1:7の重量比で配合して得られたヨウ素水溶液)に、最終的に得られる偏光子の単体透過率(Ts)が41.5%±0.1%となるように濃度を調整しながら60秒間浸漬させた(染色処理)。
次いで、液温40℃の架橋浴(水100重量部に対して、ヨウ化カリウムを3重量部配合し、ホウ酸を5重量部配合して得られたホウ酸水溶液)に30秒間浸漬させた(架橋処理)。
その後、積層体を、液温70℃のホウ酸水溶液(ホウ酸濃度4.0重量%、ヨウ化カリウム5重量%)に浸漬させながら、周速の異なるロール間で縦方向(長手方向)に総延伸倍率が5.5倍となるように一軸延伸を行った(水中延伸処理)。
その後、積層体を液温20℃の洗浄浴(水100重量部に対して、ヨウ化カリウムを4重量部配合して得られた水溶液)に浸漬させた(洗浄処理)。
その後、90℃に保たれたオーブン中で乾燥しながら、表面温度が75℃に保たれたSUS製の加熱ロールに約2秒接触させた(乾燥収縮処理)。乾燥収縮処理による積層体の幅方向の収縮率は5.2%であった。
このようにして、樹脂基材上に厚み5μmの偏光子を形成し、偏光子/樹脂基材の積層体を作製した。以下、当該偏光子を偏光子Aと称する。
芳香族骨格とジオール骨格を有するエポキシ樹脂(三菱ケミカル社製、「YX7105」)30部をメチルエチルケトン67.6部に溶解し、エポキシ樹脂溶液を得た。得られたエポキシ樹脂溶液に、光カチオン重合開始剤(サンアプロ社製、商品名:CPI(登録商標)-100P)2.4部を添加し、保護層形成組成物を得た。
2.で得られた保護層形成組成物を、上記で得られた偏光板の偏光子表面にワイヤーバーを用いて塗布し、塗布膜を60℃で3分間乾燥した。次いで、高圧水銀ランプを用いて積算光量が600mJ/cm2となるよう紫外線を照射し、保護層を形成した。保護層の厚みは2μm~3μmであり、ガラス転移温度(Tg)は31℃であった。以下、当該保護層を保護層Aと称する。
このようにして、保護層A/偏光子A/樹脂基材の構成を有する積層体を得た。さらに、当該積層体の樹脂基材を剥離し、偏光子の保護層と反対側の面に、同様の方法で保護層Aを形成した。このようにして、保護層A/偏光子A/保護層Aの構成を有する偏光板を得た。該偏光板の伸び率は1.44mmであり、強度は344gであり、厚みは11μmであった。得られた偏光板を上記(4)および(5)の評価に供した。結果を表1に示す。
1.偏光子/樹脂基材の積層体の作製
熱可塑性樹脂基材として、長尺状で、吸水率0.75%、Tg約75℃である、非晶質のイソフタル共重合ポリエチレンテレフタレートフィルム(厚み:100μm)を用いた。樹脂基材の片面に、コロナ処理(処理条件:55W・min/m2)を施した。
ポリビニルアルコール(重合度4200、ケン化度99.2モル%)およびアセトアセチル変性PVA(日本合成化学工業社製、商品名「ゴーセファイマーZ410」)を9:1で混合したPVA系樹脂100重量部に、ヨウ化カリウム13重量部を添加し、PVA水溶液(塗布液)を調製した。
樹脂基材のコロナ処理面に、上記PVA水溶液を塗布して60℃で乾燥することにより、厚み13μmのPVA系樹脂層を形成し、積層体を作製した。
得られた積層体を、130℃のオーブン内で周速の異なるロール間で縦方向(長手方向)に2.4倍に自由端一軸延伸した(空中補助延伸処理)。
次いで、積層体を、液温40℃の不溶化浴(水100重量部に対して、ホウ酸を4重量部配合して得られたホウ酸水溶液)に30秒間浸漬させた(不溶化処理)。
次いで、液温30℃の染色浴(水100重量部に対して、ヨウ素とヨウ化カリウムを1:7の重量比で配合して得られたヨウ素水溶液)に、最終的に得られる偏光子の単体透過率(Ts)が41.6%となるように濃度を調整しながら60秒間浸漬させた(染色処理)。
次いで、液温40℃の架橋浴(水100重量部に対して、ヨウ化カリウムを3重量部配合し、ホウ酸を5重量部配合して得られたホウ酸水溶液)に30秒間浸漬させた(架橋処理)。
その後、積層体を、液温62℃のホウ酸水溶液(ホウ酸濃度4.0重量%、ヨウ化カリウム5.0重量%)に浸漬させながら、周速の異なるロール間で縦方向(長手方向)に延伸の総倍率が3.0倍となるように一軸延伸を行った(水中延伸処理:水中延伸処理における延伸倍率は1.25倍)。
その後、積層体を液温20℃の洗浄浴(水100重量部に対して、ヨウ化カリウムを4重量部配合して得られた水溶液)に浸漬させた(洗浄処理)。
その後、90℃に保たれたオーブン中で乾燥しながら、表面温度が75℃に保たれたSUS製の加熱ロールに約2秒接触させた(乾燥収縮処理)。乾燥収縮処理による積層体の幅方向の収縮率は2%であった。このようにして、樹脂基材上に厚み6.0μmの偏光子を形成した。以下、当該偏光子を偏光子Bと称する。得られた偏光子の配向関数は、0.15であった。
偏光子を上記の方法で調製したこと以外は実施例1と同様にして、保護層A/偏光子B/保護層Aの構成を有する偏光板を得た。該偏光板の伸び率は1.66mmであり、強度は415gであり、厚みは12μmであった。得られた偏光板を上記(4)および(5)の評価に供した。結果を表1に示す。
1.保護層形成組成物の調製
ビフェニル骨格を有するエポキシ樹脂(三菱ケミカル社製、商品名:jER(登録商標) YX4000)15部をメチルエチルケトン83.8部に溶解し、エポキシ樹脂溶液を得た。得られたエポキシ樹脂溶液に、光カチオン重合開始剤(サンアプロ社製、商品名:CPI(登録商標)-100P)1.2部を添加し、保護層形成組成物を得た。以下、当該保護層形成組成物から形成される保護層を保護層Bと称する。保護層Bのガラス転移温度(Tg)は106℃であった。保護層形成組成物を上記の方法で調製したこと以外は実施例1と同様にして、保護層B/偏光子A/保護層Bの構成を有する偏光板を得た。該偏光板の伸び率は1.17mmであり、強度は256gであり、厚みは11μmであった。得られた偏光板を上記(4)および(5)の評価に供した。結果を表1に示す。
実施例2と同様の方法で偏光子Bを得たこと以外は、比較例1と同様にして、保護層B/偏光子B/保護層Bの構成を有する偏光板を得た。該偏光板の伸び率は1.26mmであり、強度は337gであり、厚みは12μmであった。得られた偏光板を上記(4)および(5)の評価に供した。結果を表1に示す。
保護層Aを偏光子Aの片面のみに設けたこと以外は実施例1と同様にして、保護層A/偏光子Aの構成を有する偏光板を得た。該偏光板の伸び率は、保護層側から突き刺し試験を行った場合は1.35mmであり、偏光子側から突き刺し試験を行った場合は1.00mm以下であった。該偏光板の強度は、保護層側から突き刺し試験を行った場合は285gであり、偏光子側から突き刺し試験を行った場合は100g以下であった。さらに、該偏光板の厚みは8μmであった。得られた偏光板を上記(4)および(5)の評価に供した。結果を表1に示す。
実施例1と同様の方法で偏光子Aを作製し、保護層を設けなかった。該偏光子の伸び率は1.00mm以下であり、強度は100g以下であり、厚みは5μmであった。得られた偏光子を上記(4)および(5)の評価に供した。結果を表1に示す。
実施例2と同様の方法で偏光子Bを作製し、保護層を設けなかった。該偏光子の伸び率は1.38mmであり、強度は267gであり、厚みは6μmであった。得られた偏光子を上記(4)および(5)の評価に供した。結果を表1に示す。
保護層にアクリルフィルム(厚み20μm、ガラス転移温度(Tg)123℃、以下保護層Cと称する)を用いたこと以外は実施例1と同様にして、保護層C/偏光子A/保護層Cの構成を有する偏光板を得た。該偏光板の伸び率は1.00mm以下であり、強度は500g以上であり、厚みは45μmであった。得られた偏光板を上記(4)および(5)の評価に供した。結果を表1に示す。
保護層Cを偏光子Aの片側にのみ形成したこと以外は比較例6と同様にして、保護層C/偏光子Aの構成を有する偏光板を得た。該偏光板の伸び率は1.00mm以下であり、強度は500g以上であり、厚みは25μmであった。得られた偏光板を上記(4)および(5)の評価に供した。結果を表1に示す。
表1から明らかなように、実施例1および2の構成を有する偏光板は、密着性に優れ、かつ、曲面追従性に優れることがわかる。
20 保護層
30 保護層
100 偏光板
Claims (7)
- 偏光子と、該偏光子の両面に配置された保護層と、を含み、
該保護層が、芳香族骨格とジオール骨格とを有するエポキシ樹脂を含み、そのガラス転移温度が40℃以下であり、
突き刺し試験時の伸び量が1.40mm以上である、
偏光板。 - 前記偏光子が、二色性物質を含むポリビニルアルコール系樹脂フィルムで構成され、配向関数が0.30以下である、請求項1に記載の偏光板。
- 前記保護層が、前記エポキシ樹脂の光カチオン重合硬化物、または、前記エポキシ樹脂の有機溶媒溶液の塗布膜の固化物で構成されている、請求項1または2に記載の偏光板。
- 総厚みが20μm以下である、請求項1から3のいずれかに記載の偏光板。
- 突き刺し強度が300g以上である、請求項1から4に記載の偏光板。
- 前記保護層のガラス転移温度が0℃以上である、請求項1から5のいずれかに記載の偏光板。
- 位相差層と、請求項1から6のいずれかに記載の偏光子と保護層と、を含む、位相差層付偏光板。
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Citations (7)
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JP2016004205A (ja) * | 2014-06-18 | 2016-01-12 | チェイル インダストリーズ インコーポレイテッド | 偏光板およびこれを用いた表示装置 |
JP2016085369A (ja) * | 2014-10-27 | 2016-05-19 | 三星エスディアイ株式会社Samsung SDI Co.,Ltd. | 偏光板及びこれを備える画像表示装置 |
JP2019038969A (ja) * | 2017-08-28 | 2019-03-14 | 味の素株式会社 | 樹脂組成物 |
JP2020016743A (ja) * | 2018-07-25 | 2020-01-30 | 日東電工株式会社 | 偏光膜および偏光膜の製造方法 |
WO2020175242A1 (ja) * | 2019-02-26 | 2020-09-03 | 日東電工株式会社 | 偏光膜、偏光板、および該偏光膜の製造方法 |
JP2020532769A (ja) * | 2017-09-22 | 2020-11-12 | エルジー・ケム・リミテッド | 偏光板およびそれを含む画像表示装置 |
JP2020533644A (ja) * | 2017-09-22 | 2020-11-19 | エルジー・ケム・リミテッド | 偏光板およびそれを含む画像表示装置 |
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JP2016004205A (ja) * | 2014-06-18 | 2016-01-12 | チェイル インダストリーズ インコーポレイテッド | 偏光板およびこれを用いた表示装置 |
JP2016085369A (ja) * | 2014-10-27 | 2016-05-19 | 三星エスディアイ株式会社Samsung SDI Co.,Ltd. | 偏光板及びこれを備える画像表示装置 |
JP2019038969A (ja) * | 2017-08-28 | 2019-03-14 | 味の素株式会社 | 樹脂組成物 |
JP2020532769A (ja) * | 2017-09-22 | 2020-11-12 | エルジー・ケム・リミテッド | 偏光板およびそれを含む画像表示装置 |
JP2020533644A (ja) * | 2017-09-22 | 2020-11-19 | エルジー・ケム・リミテッド | 偏光板およびそれを含む画像表示装置 |
JP2020016743A (ja) * | 2018-07-25 | 2020-01-30 | 日東電工株式会社 | 偏光膜および偏光膜の製造方法 |
WO2020175242A1 (ja) * | 2019-02-26 | 2020-09-03 | 日東電工株式会社 | 偏光膜、偏光板、および該偏光膜の製造方法 |
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TW202232154A (zh) | 2022-08-16 |
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