WO2021117289A1 - 偏光板、偏光板のセットおよび画像表示装置 - Google Patents
偏光板、偏光板のセットおよび画像表示装置 Download PDFInfo
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- WO2021117289A1 WO2021117289A1 PCT/JP2020/029283 JP2020029283W WO2021117289A1 WO 2021117289 A1 WO2021117289 A1 WO 2021117289A1 JP 2020029283 W JP2020029283 W JP 2020029283W WO 2021117289 A1 WO2021117289 A1 WO 2021117289A1
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- WIPO (PCT)
- Prior art keywords
- polarizing plate
- polarizer
- hole
- image display
- polarizing
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Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
-
- 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
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/02—Details
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/12—Light sources with substantially two-dimensional radiating surfaces
- H05B33/14—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of the electroluminescent material, or by the simultaneous addition of the electroluminescent material in or onto the light source
Definitions
- the present invention relates to a polarizing plate, a set of polarizing plates, and an image display device.
- Polarizing plates are widely used in image display devices such as mobile phones and notebook personal computers in order to realize image display and / or improve the performance of the image display.
- image display devices equipped with cameras have come to be widely used.
- a polarizing plate having a through hole at a position corresponding to the camera unit has also been widely used.
- a polarizing plate having such a through hole there are various considerations in or near the through hole.
- the present invention has been made to solve the above-mentioned conventional problems, and the main object thereof is a polarizing plate in which a through hole is formed in the vicinity of an end portion, and cracks around the through hole are remarkably suppressed.
- the purpose is to provide a polarizing plate.
- the polarizing plate according to the embodiment of the present invention has a polarizer, a protective layer arranged on at least one side of the polarizer, and an adhesive layer.
- the polarizing plate has a rectangular shape and has through holes.
- the thickness of the polarizer is less than 10 ⁇ m.
- the diameter of the through hole is 5 mm or less, and the through hole is formed at a position within 11 mm from the long side and within 11 mm from the short side.
- the thickness of the polarizer is 8 ⁇ m or less.
- the thickness of the polarizer is 6 ⁇ m or less.
- the polarizing plate is held on a glass plate via the pressure-sensitive adhesive layer, held at ⁇ 40 ° C.
- the amount of displacement of the polarizing plate in the through-hole portion after being subjected to the shock test is 120 ⁇ m or less.
- two through holes are formed, and all of the through holes are formed at positions within 11 mm from the long side and within 11 mm from the short side.
- the absorption axis of the polarizer extends in the short side direction. In another embodiment, the absorption axis of the polarizer extends in the long side direction.
- a set of polarizing plates is provided.
- This set of polarizing plates consists of a polarizing plate in which the absorption axis of the polarizer extends in the short side direction and a polarizing plate in which the absorption axis of the polarizer extends in the long side direction. It is formed at the corresponding position of.
- an image display device includes an image display cell and the above-mentioned polarizing plate.
- Another image display device of the present invention includes an image display cell and a set of the above-mentioned polarizing plates.
- One polarizing plate in the set of polarizing plates is arranged on the visual side of the image display cell, and the other polarizing plate is arranged on the back side of the image display cell.
- the through hole diameter, the through hole formation position, and the thickness of the polarizer are optimized in combination to optimize the through hole. It is possible to realize a polarizing plate in which cracks around the holes are remarkably suppressed.
- FIG. 5 is a schematic cross-sectional view taken along the line II-II of the polarizing plate of FIG. It is an enlarged sectional view of the main part explaining the deviation in the through-hole portion in the polarizing plate according to the embodiment of this invention.
- FIG. 1A is a schematic plan view illustrating a polarizing plate according to one embodiment of the present invention
- FIG. 2 is a schematic cross-sectional view taken along line II-II of the polarizing plate of FIG. 1A.
- the polarizing plate 100 of the illustrated example is located on the polarizing element 11, the protective layer 12 arranged on one side of the polarizing element 11 (hereinafter, may be referred to as an outer protective layer) 12, and on the other side of the polarizing element 11. It has an arranged protective layer (hereinafter, may be referred to as an inner protective layer) 13 and an adhesive layer 20. Either the outer protective layer 12 or the inner protective layer 13 may be omitted depending on the purpose, the desired configuration, and the like.
- the thickness of the polarizer 11 is less than 10 ⁇ m, preferably 8 ⁇ m or less, more preferably 6 ⁇ m or less, still more preferably 5 ⁇ m or less.
- the thickness of the polarizer can be, for example, 1 ⁇ m or more, and can be, for example, 2 ⁇ m or more.
- cracks around the through hole can be remarkably suppressed by a synergistic effect with the effect of optimizing the diameter of the through hole and optimizing the formation position of the through hole. Can be done.
- the absorption axis of the polarizer 11 may extend in the long side direction or may extend in the short side direction.
- the polarizing plate 100 typically has a rectangular shape as shown in FIG. 1A.
- the term "rectangular shape” includes a shape including a deformed portion such as an R shape in which each vertex is chamfered as shown in FIG. 1A.
- the polarizing plate 100 is formed with a through hole 30.
- the through hole 30 is typically formed at or near the end of the polarizing plate, and is preferably formed at a corner as shown in the illustrated example. By forming the through hole at or near the end of the polarizing plate, the influence on the image display can be minimized when the polarizing plate is applied to the image display device.
- the plan view shape of the through hole 30 any suitable shape may be adopted depending on the purpose and the desired configuration of the image display device.
- a typical example is a substantially circular shape as shown in the illustrated example.
- the through hole can be formed by various methods such as laser machining, cutting with an end mill, and punching with a Thomson blade or a Pinnacle (registered trademark) blade.
- the diameter of the through hole is typically 5 mm or less, preferably 1 mm to 5 mm, and more preferably 2 mm to 4 mm.
- the diameter of the through hole is within such a range, cracks around the through hole can be remarkably suppressed by a synergistic effect with the effect of optimizing the thickness of the polarizer and optimizing the formation position of the through hole. Can be done.
- the through hole 30 is formed at a position within 11 mm from the long side and within 11 mm from the short side.
- the through hole is preferably within 11 mm from the long side and within 3 mm from the short side, within 3 mm from the long side and within 11 mm from the short side, within 9 mm from the long side and within 7 mm from the short side, or within 7 mm from the long side.
- the polarizing plate according to the embodiment of the present invention has very high industrial and commercial value.
- the distance from the long side to the through hole is, as shown in FIG.
- a plurality of through holes may be formed as shown in FIG. 1C.
- two through holes are formed, but the number of through holes may be three or four or more.
- both of the two through holes are formed at positions within 11 mm from the long side and within 11 mm from the short side.
- the through hole is preferably within 11 mm from the long side and within 3 mm from the short side, within 3 mm from the long side and within 11 mm from the short side, within 9 mm from the long side and within 7 mm from the short side, or within 7 mm from the long side.
- the polarizing plate 100 is in a state where the polarizing plate 100 is attached to a glass plate (which can correspond to a substrate of an image display cell) 120 via an adhesive layer 20.
- the amount D of the polarizing plate in the through-hole portion after being subjected to a heat shock test in which holding at ⁇ 40 ° C. for 30 minutes and then holding at 85 ° C. for 30 minutes is repeated for 100 cycles is preferably 120 ⁇ m or less. , More preferably 100 ⁇ m or less, further preferably 80 ⁇ m or less, and particularly preferably 60 ⁇ m or less.
- the smaller the deviation amount D the more preferable.
- the lower limit of the deviation amount D can be, for example, 10 ⁇ m.
- the amount of deviation D refers to the maximum portion of the polarizing plate that moves away from the through-hole portion when viewed in cross section.
- the reference for the through-hole portion can typically be the lower end of the pressure-sensitive adhesive layer. That is, when the polarizing plate shifts mainly due to the shrinkage of the polarizer 11 (to the right in the illustrated example), the pressure-sensitive adhesive layer 20 stays on the adhered glass plate 120, so that the through-hole portion is recognized as being displaced. It will be. As shown in FIG. 3, the polarizing plate is typically displaced toward the side away from the through hole in the through hole portion (right side of FIG. 3), and the opposite portion is displaced so as to protrude into the through hole (FIG. 3). 3 left side).
- the displacement of the polarizing plate in the through-hole portion is substantially the displacement of the pressure-sensitive adhesive layer.
- the deviation amount D is within such a range, not only can cracks around the through holes be remarkably suppressed, but also light leakage due to deviation can be reduced in the image display device.
- the ratio D / R of the deviation amount D to the diameter R of the through hole is preferably 5% to 30%, more preferably 10% to 30%.
- D / R is in such a range, both cracks and light leakage around the through hole can be remarkably suppressed.
- the ratio (%) of the residual stress of the through-hole portion to the residual stress at the center of the polarizing plate is preferably 77% or less.
- the ratio can vary depending on the diameter of the through hole. When the diameter of the through hole is 3 mm to 5 mm (for example, 4 mm), the ratio is more preferably 70% or less, further preferably 68% or less, and particularly preferably 65% or less. When the diameter of the through hole is less than 3 mm (for example, 2 mm), the ratio is more preferably 76% or less, further preferably 74% or less, and particularly preferably 72% or less.
- the lower limit of the ratio can be, for example, 50% regardless of the diameter of the through hole.
- the ratio of the residual stress is in such a range, cracks around the through hole can be remarkably suppressed.
- Such a ratio of residual stress can be realized by adjusting the formation position of the through hole and the deviation amount D in combination.
- the “residual stress of the through hole portion” means the residual stress of the portion where the residual stress is maximum in the outer peripheral portion of the through hole.
- the polarizing plate according to the embodiment of the present invention may further have an arbitrary appropriate optical functional layer depending on the purpose.
- the optical functional layer include a retardation layer, a conductive layer for a touch panel, and a reflective polarizer.
- the type, number, combination, arrangement position, and the like of the optical functional layers incorporated in the polarizing plate can be appropriately set according to the purpose.
- the polarizing plate according to the embodiment of the present invention preferably has an aspect ratio of 1.3 to 2.5.
- the size of the polarizing plate is, for example, 145 mm to 155 mm in length and 65 mm to 75 mm in width, or 230 mm to 240 mm in length and 140 mm to 150 mm in width. That is, the polarizing plate according to the embodiment of the present invention can be suitably used for a smartphone or a tablet PC.
- the smartphone size may be, for example, 120 mm to 200 mm in length and 30 mm to 120 mm in width.
- the polarizer, the protective layer, and the pressure-sensitive adhesive layer constituting the polarizing plate will be specifically described.
- the polarizer is typically composed of a resin film containing a dichroic substance.
- the resin film any suitable resin film that can be used as a polarizer can be adopted.
- the resin film is typically a polyvinyl alcohol-based resin (hereinafter, referred to as “PVA-based resin”) film.
- the resin film may be a single-layer resin film or a laminated body having two or more layers.
- the polarizer composed of a single-layer resin film include those obtained by subjecting a PVA-based resin film to a dyeing treatment with iodine and a stretching treatment (typically, uniaxial stretching).
- the dyeing with iodine is performed, for example, by immersing a PVA-based resin film in an aqueous iodine solution.
- the draw ratio of the uniaxial stretching is preferably 3 to 7 times. Stretching may be performed after the dyeing treatment or while dyeing. Alternatively, it may be stretched and then dyed. If necessary, the PVA-based resin film is subjected to a swelling treatment, a cross-linking treatment, a cleaning treatment, a drying treatment and the like.
- the polarizer obtained by using the laminate include a laminate of a resin base material and a PVA-based resin layer (PVA-based resin film) laminated on the resin base material, or a resin base material and the resin.
- Examples thereof include a polarizer obtained by using a laminate with a PVA-based resin layer coated and formed on a base material.
- the polarizer obtained by using the laminate of the resin base material and the PVA-based resin layer coated and formed on the resin base material is, for example, a resin base material obtained by applying a PVA-based resin solution to the resin base material and drying the resin base material.
- stretching typically includes immersing the laminate in an aqueous boric acid solution for stretching. Further, stretching may further include, if necessary, stretching the laminate in the air at a high temperature (eg, 95 ° C. or higher) prior to stretching in boric acid aqueous solution.
- a high temperature eg, 95 ° C. or higher
- the obtained resin base material / polarizer laminate may be used as it is (that is, the resin base material may be used as a protective layer for the polarizer), and the resin base material is peeled off from the resin base material / polarizer laminate. Then, an arbitrary appropriate protective layer according to the purpose may be laminated on the peeled surface. Details of the method for producing such a polarizer are described in, for example, Japanese Patent Application Laid-Open No. 2012-73580 and Japanese Patent No. 6470455. The description of these patent documents is incorporated herein by reference.
- the thickness of the polarizer is as described in item A-1 above.
- the polarizer preferably exhibits absorption dichroism at any wavelength of 380 nm to 780 nm.
- the simple substance transmittance of the polarizer is, for example, 41.5% to 46.0%, preferably 43.0% to 46.0%, and more preferably 44.5% to 46.0%.
- the degree of polarization of the polarizer is preferably 97.0% or more, more preferably 99.0% or more, and further preferably 99.9% or more.
- the protective layer is formed of any suitable film that can be used as a protective layer for the polarizer.
- the material that is the main component of the film include cellulose-based resins such as triacetyl cellulose (TAC), polyester-based, polyvinyl alcohol-based, polycarbonate-based, polyamide-based, polyimide-based, polyethersulfone-based, and polysulfone-based. , Polystyrene-based, polycarbonate-based, polyolefin-based, (meth) acrylic-based, acetate-based transparent resins and the like.
- TAC triacetyl cellulose
- polyester-based polyvinyl alcohol-based
- polycarbonate-based polycarbonate-based
- polyamide-based polyamide-based
- polyimide-based polyimide-based
- polyethersulfone-based polysulfone-based
- thermosetting resins such as (meth) acrylic, urethane, (meth) acrylic urethane, epoxy, and silicone, or ultraviolet curable resins can also be mentioned.
- glassy polymers such as siloxane-based polymers can also be mentioned.
- the polymer film described in JP-A-2001-343529 (WO01 / 37007) can also be used.
- a resin composition containing a thermoplastic resin having a substituted or unsubstituted imide group in the side chain and a thermoplastic resin having a substituted or unsubstituted phenyl group and a nitrile group in the side chain.
- the polymer film can be, for example, an extruded product of the above resin composition.
- the outer protective layer 12 is provided with a process for improving visibility when visually recognizing through polarized sunglasses (typically, a (elliptical) circularly polarized light function is imparted, and an ultra-high position is provided. (Giving a phase difference) may be applied. By performing such a process, excellent visibility can be realized even when the display screen is visually recognized through a polarized lens such as polarized sunglasses. Therefore, the polarizing plate can also be suitably applied to an image display device that can be used outdoors.
- polarized sunglasses typically, a (elliptical) circularly polarized light function is imparted, and an ultra-high position is provided. (Giving a phase difference) may be applied.
- the inner protective layer is preferably optically isotropic.
- optically isotropic means that the in-plane retardation Re (550) is 0 nm to 10 nm and the thickness direction retardation Rth (550) is -10 nm to +10 nm.
- Re ( ⁇ ) is an in-plane phase difference measured with light having a wavelength of ⁇ nm at 23 ° C.
- Re (550) is a phase difference in the thickness direction measured with light having a wavelength of 550 nm at 23 ° C.
- Rth ( ⁇ ) is a phase difference in the thickness direction measured with light having a wavelength of ⁇ nm at 23 ° C.
- Rth (550) is a phase difference in the thickness direction measured with light having a wavelength of 550 nm at 23 ° C.
- nx is the refractive index in the direction in which the in-plane refractive index is maximized (that is, the slow-phase axis direction), and ny is the in-plane refraction in the direction orthogonal to the slow-phase axis (that is, the phase-advancing axis direction). It is a rate, and nz is a refractive index in the thickness direction.
- the thickness of the protective layer is, for example, 10 ⁇ m to 50 ⁇ m, preferably 20 ⁇ m to 40 ⁇ m.
- the thickness of the protective layer is the thickness including the thickness of the surface treatment layer.
- the adhesive layer 20 is typically used to attach a polarizing plate to an image display cell.
- the pressure-sensitive adhesive layer may be typically composed of an acrylic pressure-sensitive adhesive (acrylic pressure-sensitive adhesive composition).
- the acrylic pressure-sensitive adhesive composition typically contains a (meth) acrylic polymer as a main component.
- the (meth) acrylic polymer can be contained in the pressure-sensitive adhesive composition in a proportion of, for example, 50% by weight or more, preferably 70% by weight or more, and more preferably 90% by weight or more in the solid content of the pressure-sensitive adhesive composition.
- the (meth) acrylic polymer contains an alkyl (meth) acrylate as a main component as a monomer unit.
- (meth) acrylate means acrylate and / or methacrylate.
- the alkyl (meth) acrylate can be contained in a proportion of preferably 80% by weight or more, more preferably 90% by weight or more, in the monomer component forming the (meth) acrylic polymer.
- Examples of the alkyl group of the alkyl (meth) acrylate include a linear or branched alkyl group having 1 to 18 carbon atoms. The average number of carbon atoms of the alkyl group is preferably 3 to 9, and more preferably 3 to 6.
- a preferred alkyl (meth) acrylate is butyl acrylate.
- the monomer (copolymerization monomer) constituting the (meth) acrylic polymer in addition to the alkyl (meth) acrylate, a carboxyl group-containing monomer, a hydroxyl group-containing monomer, an amide group-containing monomer, an aromatic ring-containing (meth) acrylate, and a complex
- examples include ring-containing vinyl-based monomers.
- Representative examples of the copolymerization monomer include acrylic acid, 4-hydroxybutyl acrylate, phenoxyethyl acrylate, and N-vinyl-2-pyrrolidone.
- the acrylic pressure-sensitive adhesive composition may preferably contain a silane coupling agent and / or a cross-linking agent.
- the silane coupling agent examples include an epoxy group-containing silane coupling agent.
- the cross-linking agent examples include isocyanate-based cross-linking agents and peroxide-based cross-linking agents.
- the acrylic pressure-sensitive adhesive composition may contain an antioxidant and / or a conductive agent. By adjusting the type, number, combination and copolymerization ratio of the monomer unit, the type, number, combination and compounding ratio of the silane coupling agent, and the type, number, combination and compounding ratio of the cross-linking agent, etc., according to the purpose. An acrylic pressure-sensitive adhesive composition having the desired properties (as a result, a pressure-sensitive adhesive layer) can be obtained.
- the desired deviation amount D can be realized.
- Details of the pressure-sensitive adhesive layer or the acrylic pressure-sensitive adhesive composition are described in, for example, JP-A-2006-183022, JP-A-2015-199942, JP-A-2018-053114, JP-A-2016-190996, International Publication. It is described in No. 2018/008712, and the description of these publications is incorporated herein by reference.
- the thickness of the pressure-sensitive adhesive layer is preferably 5 ⁇ m to 50 ⁇ m, more preferably 10 ⁇ m to 30 ⁇ m. When the thickness of the pressure-sensitive adhesive layer is within such a range, the desired displacement amount D can be realized.
- Storage modulus G -40 °C of the adhesive layer ' is preferably 1.0 ⁇ 10 5 (Pa) or more, more preferably 1.0 ⁇ 10 6 (Pa) or more, more preferably 1 It is 0.0 ⁇ 10 7 (Pa) or more, and particularly preferably 1.0 ⁇ 10 8 (Pa) or more.
- Storage modulus G ' can be, for example, 1.0 ⁇ 10 9 (Pa) or less.
- the polarizing plate according to the above item A may be used as a viewing side polarizing plate or as a back side polarizing plate.
- a set of polarizing plates can be provided by combining the polarizing plates of two specific embodiments among the polarizing plates according to the above item A. Therefore, embodiments of the present invention also include a set of such polarizing plates.
- the two polarizing plates constituting the set have through holes formed at positions corresponding to each other. In the present specification, "formed at positions corresponding to each other" means that the through holes overlap when the two polarizing plates are overlapped.
- the set of polarizing plates consists of a polarizing plate in which the absorption axis of the polarizer extends in the short side direction and a polarizing plate in which the absorption axis of the polarizer extends in the long side direction.
- the through holes of the two polarizing plates are typically located within 11 mm from the long side and within 11 mm from the short side; preferably within 11 mm from the long side and within 3 mm from the short side and 3 mm from the long side.
- the image display device includes an image display cell and a polarizing plate.
- the polarizing plate is a polarizing plate according to the embodiment of the present invention according to the above item A.
- the polarizing plate is attached to the image display cell via the pressure-sensitive adhesive layer.
- the image display device comprises an image display cell and a set of polarizing plates.
- the set of polarizing plates is a set of polarizing plates according to the embodiment of the present invention according to the above item B.
- one polarizing plate in the set of polarizing plates is arranged on the visual side of the image display cell, and the other polarizing plate is arranged on the back side of the image display cell.
- the image display device include a liquid crystal display device, an organic electroluminescence (EL) display device, and a quantum dot display device.
- an acrylic polymer having a weight average molecular weight (Mw) of 1.5 million was prepared.
- Mw weight average molecular weight
- an isocyanate cross-linking agent trade name: Takenate D160N, trimethyl propanehexamethylene diisocyanate, manufactured by Mitsui Kagaku Co., Ltd.
- benzoyl sulfide Product name: Niper BMT 40SV, manufactured by Nippon Oil & Fats Co., Ltd.
- thiol group-containing silane coupling agent (trade name: X-41-1810, manufactured by Shin-Etsu Chemical Industry Co., Ltd., alkoxy group amount: 30% , Thiol equivalent: 450 g / mol) 0.1 part, antioxidant (trade name: Irganox 1010, hindered phenol type, manufactured by BASF Japan) 0.2 part, and conductive agent (1-ethyl-3-methyl)
- thiol group-containing silane coupling agent trade name: X-41-1810, manufactured by Shin-Etsu Chemical Industry Co., Ltd., alkoxy group amount: 30% , Thiol equivalent: 450 g / mol
- antioxidant trade name: Irganox 1010, hindered phenol type, manufactured by BASF Japan
- conductive agent (1-ethyl-3-methyl
- thermoplastic resin base material an amorphous isophthal copolymer polyethylene terephthalate film (thickness: 100 ⁇ m) having a long shape and a Tg of about 75 ° C. was used, and one side of the resin base material was subjected to corona treatment.
- a PVA aqueous solution (coating solution) was prepared by dissolving 13 parts by weight of potassium iodide in water.
- the 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 to prepare a laminate.
- the obtained laminate was uniaxially stretched 2.4 times in the longitudinal direction (longitudinal direction) in an oven at 130 ° C. (aerial auxiliary stretching treatment). Next, the laminate was immersed in an insolubilizing bath at a liquid temperature of 40 ° C.
- the HC-TAC film was attached to the surface of the polarizer of the laminated body.
- the HC-TAC film is a film in which a hard coat (HC) layer (thickness 7 ⁇ m) is formed on a triacetyl cellulose (TAC) film (thickness 25 ⁇ m), and the TAC film is attached so as to be on the polarizer side. I matched it.
- the resin base material is peeled off, a pressure-sensitive adhesive layer (thickness 20 ⁇ m) is formed on the peeled surface using the pressure-sensitive adhesive composition of Production Example 1, and the HC layer / outer protective layer / polarizer / pressure-sensitive adhesive layer is formed.
- a long polarizing plate having a structure was obtained.
- This polarizing plate was punched into a shape having a size of 142.0 mm in length and 66.8 mm in width and provided with an R portion of R7.0 mm at four corner portions. At this time, punching was performed so that the absorption axis direction of the polarizer was the short side direction. Further, a through hole having a diameter of 4 mm was formed at a position 2 mm from the long side and 2 mm from the short side. The through hole was formed by end milling. The feed rate of the end mill was 500 mm / min, the rotation speed was 2500 rpm, and the amount of scraping was 0.1 mm. In this way, a polarizing plate having through holes was produced. The obtained polarizing plate was subjected to the evaluation of (2) above. The results are shown in Table 1 together with the detailed configuration of the polarizing plate. In Table 1, "0 °” means the long side direction, and "90 °” means the short side direction.
- Example 2 A polarizing plate was produced in the same manner as in Example 1 except that the through holes were formed at positions 6 mm from the long side and 4 mm from the short side. The obtained polarizing plate was subjected to the same evaluation as in Example 1. The results are shown in Table 1 together with the detailed configuration of the polarizing plate.
- Examples 3 to 6 Polarizing plates were prepared in the same manner as in Example 1 except that the positions for forming the through holes were set to the positions shown in Table 1. The obtained polarizing plate was subjected to the same evaluation as in Example 1. The results are shown in Table 1 together with the detailed configuration of the polarizing plate.
- Example 7 A long polarizing plate was obtained in the same manner as in Example 1. This polarizing plate was punched into a shape having a size of 142.0 mm in length and 66.8 mm in width and provided with an R portion of R7.0 mm at four corner portions. At this time, punching was performed so that the absorption axis direction of the polarizer was the long side direction. The following procedure was the same as in Example 1 to prepare a polarizing plate having through holes having a diameter of 4 mm at positions 2 mm from the long side and 2 mm from the short side. The obtained polarizing plate was subjected to the same evaluation as in Example 1. The results are shown in Table 1 together with the detailed configuration of the polarizing plate.
- Example 8 A polarizing plate was produced in the same manner as in Example 7 except that the through holes were formed at positions 6 mm from the long side and 4 mm from the short side. The obtained polarizing plate was subjected to the same evaluation as in Example 1. The results are shown in Table 1 together with the detailed configuration of the polarizing plate.
- Polarizing plates were prepared in the same manner as in Example 7 except that the positions for forming the through holes were set to the positions shown in Table 1. The obtained polarizing plate was subjected to the same evaluation as in Example 1. The results are shown in Table 1 together with the detailed configuration of the polarizing plate.
- Example 13 A polarizing plate was produced in the same manner as in Example 1 except that a through hole having a diameter of 2 mm was formed. The through hole was formed by a CO 2 laser. The obtained polarizing plate was subjected to the same evaluation as in Example 1. The results are shown in Table 1 together with the detailed configuration of the polarizing plate.
- Example 14 A polarizing plate was produced in the same manner as in Example 13 except that the through holes were formed at positions 6 mm from the long side and 4 mm from the short side. The obtained polarizing plate was subjected to the same evaluation as in Example 1. The results are shown in Table 1 together with the detailed configuration of the polarizing plate.
- Polarizing plates were prepared in the same manner as in Example 13 except that the positions for forming the through holes were set as shown in Table 1. The obtained polarizing plate was subjected to the same evaluation as in Example 1. The results are shown in Table 1 together with the detailed configuration of the polarizing plate.
- Example 19 A polarizing plate was produced in the same manner as in Example 7 except that a through hole having a diameter of 2 mm was formed. The obtained polarizing plate was subjected to the same evaluation as in Example 1. The results are shown in Table 1 together with the detailed configuration of the polarizing plate.
- Example 20 A polarizing plate was produced in the same manner as in Example 19 except that the through holes were formed at positions 6 mm from the long side and 4 mm from the short side. The obtained polarizing plate was subjected to the same evaluation as in Example 1. The results are shown in Table 1 together with the detailed configuration of the polarizing plate.
- Polarizing plates were prepared in the same manner as in Example 19 except that the positions for forming the through holes were set to the positions shown in Table 1. The obtained polarizing plate was subjected to the same evaluation as in Example 1. The results are shown in Table 1 together with the detailed configuration of the polarizing plate.
- a film (thickness 12 ⁇ m) obtained by adding iodine to a long polyvinyl alcohol (PVA) -based resin film and uniaxially stretching it in the longitudinal direction (MD direction) was used.
- a long HC-TAC film serving as an outer protective layer and a long acrylic resin film (thickness 20 ⁇ m) serving as an inner protective layer are attached to both sides of the polarizer so as to align their longitudinal directions with each other. I matched it.
- the HC-TAC film was bonded so that the TAC film was on the polarizer side.
- a pressure-sensitive adhesive layer (thickness 20 ⁇ m) was formed on the surface of the inner protective layer using the pressure-sensitive adhesive composition of Production Example 1 to obtain a long polarizing plate.
- This polarizing plate was punched into a shape having a size of 142.0 mm in length and 66.8 mm in width and provided with an R portion of R7.0 mm at four corner portions. At this time, punching was performed so that the absorption axis direction of the polarizer was the short side direction. Further, through holes having a diameter of 4 mm were formed at positions 8 mm from the long side and 6 mm from the short side in the same manner as in Example 1. In this way, a polarizing plate having through holes was produced. The obtained polarizing plate was subjected to the same evaluation as in Example 1. The results are shown in Table 1 together with the detailed configuration of the polarizing plate.
- ⁇ Comparative example 5> A polarizing plate was produced in the same manner as in Comparative Example 1 except that the positions of forming the through holes were 6 mm from the long side and 4 mm from the short side, and the diameter of the through holes was 2 mm. The through hole was formed by a CO 2 laser. The obtained polarizing plate was subjected to the same evaluation as in Example 1. The results are shown in Table 1 together with the detailed configuration of the polarizing plate.
- Polarizing plates were prepared in the same manner as in Comparative Example 5 except that the positions for forming the through holes were set to the positions shown in Table 1. The obtained polarizing plate was subjected to the same evaluation as in Example 1. The results are shown in Table 1 together with the detailed configuration of the polarizing plate.
- Polarizing plates were prepared in the same manner as in Comparative Example 8 except that the positions for forming the through holes were set as shown in Table 1. The obtained polarizing plate was subjected to the same evaluation as in Example 1. The results are shown in Table 1 together with the detailed configuration of the polarizing plate.
- Example 25 A resin base material / polarizer laminate was obtained in the same manner as in Example 1.
- An HC-COP film was attached to the surface of the polarizer of this laminate.
- the HC-COP film is a film in which an HC layer (thickness 2 ⁇ m) is formed on a cycloolefin resin (COP) film (thickness 25 ⁇ m), and the COP film is bonded so as to be on the polarizer side.
- the resin base material is peeled off, a COP film is attached to the peeled surface, and a pressure-sensitive adhesive layer (thickness 20 ⁇ m) is formed on the surface of the COP film using the pressure-sensitive adhesive composition of Production Example 1 to form an HC layer /.
- a long polarizing plate having a structure of an outer protective layer / a polarizer / an inner protective layer / an adhesive layer was obtained.
- This polarizing plate was punched into a shape having a size of 142.0 mm in length and 66.8 mm in width and provided with an R portion of R7.0 mm at four corner portions. At this time, punching was performed so that the absorption axis direction of the polarizer was the short side direction. Further, a through hole having a diameter of 3.9 mm was formed at a position 2.6 mm from the long side and 4.3 mm from the short side. In this way, a polarizing plate having through holes was produced.
- the obtained polarizing plate was subjected to the same evaluation as in Example 1.
- Example 26 A long polarizing plate was obtained in the same manner as in Example 25. This polarizing plate was punched into a shape having a size of 142.0 mm in length and 66.8 mm in width and provided with an R portion of R7.0 mm at four corner portions. At this time, punching was performed so that the absorption axis direction of the polarizer was the long side direction. The following procedure was the same as in Example 25, and a polarizing plate having a through hole with a diameter of 3.9 mm was produced at a position 2.6 mm from the long side and 4.3 mm from the short side. The obtained polarizing plate was subjected to the same evaluation as in Example 1. The results are shown in Table 1 together with the detailed configuration of the polarizing plate.
- the polarizing plate of the present invention is suitably used for an image display device, and can be particularly preferably used for an image display device having a camera unit represented by a smartphone, a tablet PC or a smart watch.
Abstract
Description
1つの実施形態においては、上記偏光子の厚みは8μm以下である。1つの実施形態においては、上記偏光子の厚みは6μm以下である。
1つの実施形態においては、上記偏光板は、上記粘着剤層を介してガラス板に貼り合わせた状態で、-40℃で30分間保持した後85℃で30分間保持することを100サイクル繰り返すヒートショック試験に供した後の、該貫通孔部分における該偏光板のずれ量が120μm以下である。
1つの実施形態においては、上記貫通孔は2つ形成されており、該貫通孔はいずれも、長辺から11mm以内かつ短辺から11mm以内の位置に形成されている。
1つの実施形態においては、上記偏光子の吸収軸は短辺方向に延びている。別の実施形態においては、上記偏光子の吸収軸は長辺方向に延びている。
本発明の別の局面によれば、偏光板のセットが提供される。この偏光板のセットは、上記偏光子の吸収軸が短辺方向に延びる偏光板と上記偏光子の吸収軸が長辺方向に延びる偏光板とからなり、それぞれの偏光板の貫通孔が、互いの対応する位置に形成されている。
本発明の別の局面によれば、画像表示装置が提供される。この画像表示装置は、画像表示セルと上記の偏光板とを含む。
本発明の別の画像表示装置は、画像表示セルと、上記の偏光板のセットと、を含む。該偏光板のセットにおける一方の偏光板は該画像表示セルの視認側に配置され、他方の偏光板は該画像表示セルの背面側に配置されている。
A-1.偏光板の全体構成
図1Aは、本発明の1つの実施形態による偏光板を説明する概略平面図であり;図2は、図1Aの偏光板のII-II線による概略断面図である。図示例の偏光板100は、偏光子11と、偏光子11の一方の側に配置された保護層(以下、外側保護層と称する場合がある)12と、偏光子11のもう一方の側に配置された保護層(以下、内側保護層と称する場合がある)13と、粘着剤層20と、を有する。目的および所望の構成等に応じて、外側保護層12または内側保護層13のいずれか一方は省略されてもよい。
偏光子は、代表的には、二色性物質を含む樹脂フィルムで構成される。樹脂フィルムとしては、偏光子として用いられ得る任意の適切な樹脂フィルムを採用することができる。樹脂フィルムは、代表的には、ポリビニルアルコール系樹脂(以下、「PVA系樹脂」と称する)フィルムである。樹脂フィルムは、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。
保護層は、偏光子の保護層として使用できる任意の適切なフィルムで形成される。当該フィルムの主成分となる材料の具体例としては、トリアセチルセルロース(TAC)等のセルロース系樹脂や、ポリエステル系、ポリビニルアルコール系、ポリカーボネート系、ポリアミド系、ポリイミド系、ポリエーテルスルホン系、ポリスルホン系、ポリスチレン系、ポリノルボルネン系、ポリオレフィン系、(メタ)アクリル系、アセテート系等の透明樹脂等が挙げられる。また、(メタ)アクリル系、ウレタン系、(メタ)アクリルウレタン系、エポキシ系、シリコーン系等の熱硬化型樹脂または紫外線硬化型樹脂等も挙げられる。この他にも、例えば、シロキサン系ポリマー等のガラス質系ポリマーも挙げられる。また、特開2001-343529号公報(WO01/37007)に記載のポリマーフィルムも使用できる。このフィルムの材料としては、例えば、側鎖に置換または非置換のイミド基を有する熱可塑性樹脂と、側鎖に置換または非置換のフェニル基ならびにニトリル基を有する熱可塑性樹脂を含有する樹脂組成物が使用でき、例えば、イソブテンとN-メチルマレイミドからなる交互共重合体と、アクリロニトリル・スチレン共重合体とを有する樹脂組成物が挙げられる。当該ポリマーフィルムは、例えば、上記樹脂組成物の押出成形物であり得る。
粘着剤層20は、代表的には、偏光板を画像表示セルに貼り合わせるために用いられる。粘着剤層は、代表的にはアクリル系粘着剤(アクリル系粘着剤組成物)で構成され得る。アクリル系粘着剤組成物は、代表的には、(メタ)アクリル系ポリマーを主成分として含む。(メタ)アクリル系ポリマーは、粘着剤組成物の固形分中、例えば50重量%以上、好ましくは70重量%以上、より好ましくは90重量%以上の割合で粘着剤組成物に含有され得る。(メタ)アクリル系ポリマーは、モノマー単位としてアルキル(メタ)アクリレートを主成分として含有する。なお、(メタ)アクリレートはアクリレートおよび/またはメタクリレートをいう。アルキル(メタ)アクリレートは、(メタ)アクリル系ポリマーを形成するモノマー成分中、好ましくは80重量%以上、より好ましくは90重量%以上の割合で含有され得る。アルキル(メタ)アクリレートのアルキル基としては、例えば、1個~18個の炭素原子を有する直鎖状または分岐鎖状のアルキル基が挙げられる。当該アルキル基の平均炭素数は、好ましくは3個~9個であり、より好ましくは3個~6個である。好ましいアルキル(メタ)アクリレートは、ブチルアクリレートである。(メタ)アクリル系ポリマーを構成するモノマー(共重合モノマー)としては、アルキル(メタ)アクリレート以外に、カルボキシル基含有モノマー、ヒドロキシル基含有モノマー、アミド基含有モノマー、芳香環含有(メタ)アクリレート、複素環含有ビニル系モノマー等が挙げられる。共重合モノマーの代表例としては、アクリル酸、4-ヒドロキシブチルアクリレート、フェノキシエチルアクリレート、N-ビニル-2-ピロリドンが挙げられる。アクリル系粘着剤組成物は、好ましくは、シランカップリング剤および/または架橋剤を含有し得る。シランカップリング剤としては、例えばエポキシ基含有シランカップリング剤が挙げられる。架橋剤としては、例えば、イソシアネート系架橋剤、過酸化物系架橋剤が挙げられる。さらに、アクリル系粘着剤組成物は、酸化防止剤および/または導電剤を含有してもよい。モノマー単位の種類、数、組み合わせおよび共重合比、シランカップリング剤の種類、数、組み合わせおよび配合比、ならびに、架橋剤の種類、数、組み合わせおよび配合比等を調整することにより、目的に応じた所望の特性を有するアクリル系粘着剤組成物(結果として、粘着剤層)が得られ得る。その結果、本発明の実施形態においては、上記所望のずれ量Dを実現することができる。粘着剤層またはアクリル系粘着剤組成物の詳細は、例えば、特開2006-183022号公報、特開2015-199942号公報、特開2018-053114号公報、特開2016-190996号公報、国際公開第2018/008712号に記載されており、これらの公報の記載は本明細書に参考として援用される。
上記A項に記載の偏光板は、視認側偏光板として用いてもよく背面側偏光板として用いてもよい。上記A項に記載の偏光板のうち特定の2つの実施形態の偏光板を組み合わせることにより、偏光板のセットが提供され得る。したがって、本発明の実施形態は、そのような偏光板のセットも包含する。偏光板のセットにおいて当該セットを構成する2つの偏光板は、それぞれの貫通孔が互いの対応する位置に形成されている。本明細書において「互いの対応する位置に形成されている」とは、2つの偏光板を重ねたときに貫通孔が重なることを意味する。
本発明の実施形態による偏光板および偏光板のセットは、画像表示装置に適用され得る。したがって、画像表示装置もまた、本発明の実施形態に包含される。1つの実施形態においては、画像表示装置は、画像表示セルと偏光板とを含む。偏光板は、上記A項に記載の本発明の実施形態による偏光板である。偏光板は、粘着剤層を介して画像表示セルに貼り合わせられている。別の実施形態においては、画像表示装置は、画像表示セルと偏光板のセットとを含む。偏光板のセットは、上記B項に記載の本発明の実施形態による偏光板のセットである。この場合、偏光板のセットにおける一方の偏光板は該画像表示セルの視認側に配置され、他方の偏光板は該画像表示セルの背面側に配置されている。画像表示装置としては、例えば、液晶表示装置、有機エレクトロルミネセンス(EL)表示装置、量子ドット表示装置が挙げられる。
実施例および比較例で得られた偏光板を、粘着剤層を介してガラス板(マツナミガラス社製、縦350mm×横250mm×厚み1.1mm)に貼り付けて試験サンプルとした。この試験サンプルを、-40℃で30分間保持した後85℃で30分間保持することを100サイクル繰り返すヒートショック試験に供した。ヒートショック試験における昇温および降温速度は10℃/分であった。試験後、貫通孔部分の偏光板(実質的には、粘着剤層)のずれ量をOLYMPUS社製の光学顕微鏡(MX61L)で測定した。なお、測定は、3つの試験サンプルについて行い、3つの測定値のうちの最大値をずれ量とした。
(2)クラック
実施例および比較例で得られた偏光板を、上記(1)の「ずれ量」と同様の手順でヒートショック試験に供した。試験後の貫通孔部分のクラックの発生状態を、OLYMPUS社製の光学顕微鏡(MX61L)で観察し、以下の基準で評価した。
AA:クラックは認められなかった
A :長さ300μm未満の小さなクラックのみが認められた
B :長さ300μm~1mmのクラックが認められたが、光漏れは発生しなかった
C :クラックが顕著であり、光漏れが発生した
攪拌羽根、温度計、窒素ガス導入管、冷却器を備えた4つ口フラスコに、ブチルアクリレート80.3部、フェノキシエチルアクリレート16部、N-ビニル-2-ピロリドン3部、アクリル酸0.3部および4-ヒドロキシブチルアクリレート0.4部を含有するモノマー混合物を仕込んだ。さらに、モノマー混合物(固形分)100部に対して、重合開始剤として2,2’-アゾビスイソブチロニトリル0.1部を酢酸エチル100重量部と共に仕込み、緩やかに攪拌しながら窒素ガスを導入して窒素置換した後、フラスコ内の液温を55℃付近に保って8時間重合反応を行って、重量平均分子量(Mw)150万のアクリル系ポリマーの溶液を調製した。得られたアクリル系ポリマーの溶液の固形分100部に対して、イソシアネート架橋剤(商品名:タケネートD160N、トリメチロールプロパンヘキサメチレンジイソシアネート、三井化学(株)製)0.1部、ベンゾイルパーオキサイド(商品名:ナイパーBMT 40SV、日本油脂(株)製)0.3部、チオール基含有シランカップリング剤(商品名:X-41-1810、信越化学工業(株)製、アルコキシ基量:30%、チオール当量:450g/mol)0.1部、酸化防止剤(商品名:Irganox 1010、ヒンダードフェノール系、BASFジャパン社製)0.2部、および、導電剤(1-エチル-3-メチルイミダゾリウムビス(トリフルオロメタンスルホニル)イミド、第一工業製薬社製のイオン性液体)5部を配合して、粘着剤組成物を得た。
熱可塑性樹脂基材として、長尺状で、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、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(日本合成化学工業社製、商品名「ゴーセファイマー」)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重量部を添加したものを水に溶かし、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℃のオーブン内で縦方向(長手方向)に2.4倍に一軸延伸した(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)が所望の値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重量%、ヨウ化カリウム濃度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、約90℃に保たれたオーブン中で乾燥しながら、表面温度が約75℃に保たれたSUS製の加熱ロールに接触させた(乾燥収縮処理)。
このようにして、樹脂基材上に厚み約5μmの偏光子を形成し、樹脂基材/偏光子の構成を有する積層体を得た。
貫通孔の形成位置を長辺から6mmおよび短辺から4mmの位置としたこと以外は実施例1と同様にして偏光板を作製した。得られた偏光板を実施例1と同様の評価に供した。結果を、偏光板の詳細な構成とともに表1に示す。
貫通孔の形成位置を表1に示す位置としたこと以外は実施例1と同様にしてそれぞれ偏光板を作製した。得られた偏光板を実施例1と同様の評価に供した。結果を、偏光板の詳細な構成とともに表1に示す。
実施例1と同様にして長尺状の偏光板を得た。この偏光板を縦142.0mmおよび横66.8mmのサイズで、4つの角部にR7.0mmのR部を設けた形状に打ち抜いた。このとき、偏光子の吸収軸方向が長辺方向となるように打ち抜いた。以下の手順は実施例1と同様にして、長辺から2mmおよび短辺から2mmの位置に直径4mmの貫通孔を有する偏光板を作製した。得られた偏光板を実施例1と同様の評価に供した。結果を、偏光板の詳細な構成とともに表1に示す。
貫通孔の形成位置を長辺から6mmおよび短辺から4mmの位置としたこと以外は実施例7と同様にして偏光板を作製した。得られた偏光板を実施例1と同様の評価に供した。結果を、偏光板の詳細な構成とともに表1に示す。
貫通孔の形成位置を表1に示す位置としたこと以外は実施例7と同様にしてそれぞれ偏光板を作製した。得られた偏光板を実施例1と同様の評価に供した。結果を、偏光板の詳細な構成とともに表1に示す。
直径2mmの貫通孔を形成したこと以外は実施例1と同様にして偏光板を作製した。なお、当該貫通孔は、CO2レーザーで形成した。得られた偏光板を実施例1と同様の評価に供した。結果を、偏光板の詳細な構成とともに表1に示す。
貫通孔の形成位置を長辺から6mmおよび短辺から4mmの位置としたこと以外は実施例13と同様にして偏光板を作製した。得られた偏光板を実施例1と同様の評価に供した。結果を、偏光板の詳細な構成とともに表1に示す。
貫通孔の形成位置を表1に示す位置としたこと以外は実施例13と同様にしてそれぞれ偏光板を作製した。得られた偏光板を実施例1と同様の評価に供した。結果を、偏光板の詳細な構成とともに表1に示す。
直径2mmの貫通孔を形成したこと以外は実施例7と同様にして偏光板を作製した。得られた偏光板を実施例1と同様の評価に供した。結果を、偏光板の詳細な構成とともに表1に示す。
貫通孔の形成位置を長辺から6mmおよび短辺から4mmの位置としたこと以外は実施例19と同様にして偏光板を作製した。得られた偏光板を実施例1と同様の評価に供した。結果を、偏光板の詳細な構成とともに表1に示す。
貫通孔の形成位置を表1に示す位置としたこと以外は実施例19と同様にしてそれぞれ偏光板を作製した。得られた偏光板を実施例1と同様の評価に供した。結果を、偏光板の詳細な構成とともに表1に示す。
偏光子として、長尺状のポリビニルアルコール(PVA)系樹脂フィルムにヨウ素を含有させ、長手方向(MD方向)に一軸延伸して得られたフィルム(厚み12μm)を用いた。この偏光子の両側に外側保護層となる長尺状のHC-TACフィルムおよび内側保護層となる長尺状のアクリル系樹脂フィルム(厚み20μm)をそれぞれ、互いの長手方向を揃えるようにして貼り合わせた。なお、HC-TACフィルムは、TACフィルムが偏光子側となるようにして貼り合わせた。内側保護層の表面に製造例1の粘着剤組成物を用いて粘着剤層(厚み20μm)を形成し、長尺状の偏光板を得た。この偏光板を縦142.0mmおよび横66.8mmのサイズで、4つの角部にR7.0mmのR部を設けた形状に打ち抜いた。このとき、偏光子の吸収軸方向が短辺方向となるように打ち抜いた。さらに、長辺から8mmおよび短辺から6mmの位置に、実施例1と同様にして直径4mmの貫通孔を形成した。このようにして、貫通孔を有する偏光板を作製した。得られた偏光板を実施例1と同様の評価に供した。結果を、偏光板の詳細な構成とともに表1に示す。
貫通孔の形成位置を長辺から10mmおよび短辺から8mmの位置としたこと以外は比較例1と同様にして偏光板を作製した。得られた偏光板を実施例1と同様の評価に供した。結果を、偏光板の詳細な構成とともに表1に示す。
比較例1と同様にして長尺状の偏光板を得た。この偏光板を縦142.0mmおよび横66.8mmのサイズで、4つの角部にR7.0mmのR部を設けた形状に打ち抜いた。このとき、偏光子の吸収軸方向が長辺方向となるように打ち抜いた。以下の手順は比較例1と同様にして、長辺から8mmおよび短辺から6mmの位置に直径4mmの貫通孔を有する偏光板を作製した。得られた偏光板を実施例1と同様の評価に供した。結果を、偏光板の詳細な構成とともに表1に示す。
貫通孔の形成位置を長辺から10mmおよび短辺から8mmの位置としたこと以外は比較例3と同様にして偏光板を作製した。得られた偏光板を実施例1と同様の評価に供した。結果を、偏光板の詳細な構成とともに表1に示す。
貫通孔の形成位置を長辺から6mmおよび短辺から4mmの位置としたこと、および、貫通孔の直径を2mmとしたこと以外は比較例1と同様にして偏光板を作製した。なお、当該貫通孔は、CO2レーザーで形成した。得られた偏光板を実施例1と同様の評価に供した。結果を、偏光板の詳細な構成とともに表1に示す。
貫通孔の形成位置を表1に示す位置としたこと以外は比較例5と同様にしてそれぞれ偏光板を作製した。得られた偏光板を実施例1と同様の評価に供した。結果を、偏光板の詳細な構成とともに表1に示す。
貫通孔の形成位置を長辺から6mmおよび短辺から4mmの位置としたこと、および、貫通孔の直径を2mmとしたこと以外は比較例3と同様にして偏光板を作製した。なお、当該貫通孔は、CO2レーザーで形成した。得られた偏光板を実施例1と同様の評価に供した。結果を、偏光板の詳細な構成とともに表1に示す。
貫通孔の形成位置を表1に示す位置としたこと以外は比較例8と同様にしてそれぞれ偏光板を作製した。得られた偏光板を実施例1と同様の評価に供した。結果を、偏光板の詳細な構成とともに表1に示す。
実施例1と同様にして樹脂基材/偏光子の積層体を得た。この積層体の偏光子表面にHC-COPフィルムを貼り合わた。なお、HC-COPフィルムは、シクロオレフィン系樹脂(COP)フィルム(厚み25μm)にHC層(厚み2μm)が形成されたフィルムであり、COPフィルムが偏光子側となるようにして貼り合わせた。次いで、樹脂基材を剥離し、当該剥離面にCOPフィルムを貼り合わせ、COPフィルムの表面に製造例1の粘着剤組成物を用いて粘着剤層(厚み20μm)を形成して、HC層/外側保護層/偏光子/内側保護層/粘着剤層の構成を有する長尺状の偏光板を得た。この偏光板を縦142.0mmおよび横66.8mmのサイズで、4つの角部にR7.0mmのR部を設けた形状に打ち抜いた。このとき、偏光子の吸収軸方向が短辺方向となるように打ち抜いた。さらに、長辺から2.6mmおよび短辺から4.3mmの位置に直径3.9mmの貫通孔を形成した。このようにして、貫通孔を有する偏光板を作製した。得られた偏光板を実施例1と同様の評価に供した。
実施例25と同様にして長尺状の偏光板を得た。この偏光板を縦142.0mmおよび横66.8mmのサイズで、4つの角部にR7.0mmのR部を設けた形状に打ち抜いた。このとき、偏光子の吸収軸方向が長辺方向となるように打ち抜いた。以下の手順は実施例25と同様にして、長辺から2.6mmおよび短辺から4.3mmの位置に直径3.9mmの貫通孔を有する偏光板を作製した。得られた偏光板を実施例1と同様の評価に供した。結果を、偏光板の詳細な構成とともに表1に示す。
12 外側保護層
13 内側保護層
20 粘着剤層
30 貫通孔
100 偏光板
Claims (10)
- 偏光子と、該偏光子の少なくとも一方の側に配置された保護層と、粘着剤層と、を有し、貫通孔が形成されている、矩形形状の偏光板であって、
該偏光子の厚みが10μm未満であり、
該貫通孔の直径が5mm以下であり、
該貫通孔が、長辺から11mm以内かつ短辺から11mm以内の位置に形成されている、
偏光板。 - 前記偏光子の厚みが8μm以下である、請求項1に記載の偏光板。
- 前記偏光子の厚みが6μm以下である、請求項2に記載の偏光板。
- 前記粘着剤層を介して前記偏光板をガラス板に貼り合わせた状態で、-40℃で30分間保持した後85℃で30分間保持することを100サイクル繰り返すヒートショック試験に供した後の、該貫通孔部分における該偏光板のずれ量が120μm以下である、請求項1から3のいずれかに記載の偏光板。
- 前記貫通孔が2つ形成されており、
該貫通孔がいずれも、長辺から11mm以内かつ短辺から11mm以内の位置に形成されている、
請求項1から4のいずれかに記載の偏光板。 - 前記偏光子の吸収軸が短辺方向に延びている、請求項1から5のいずれかに記載の偏光板。
- 前記偏光子の吸収軸が長辺方向に延びている、請求項1から5のいずれかに記載の偏光板。
- 請求項6に記載の偏光板と請求項7に記載の偏光板とからなり、
それぞれの偏光板の貫通孔が、互いの対応する位置に形成されている、
偏光板のセット。 - 画像表示セルと請求項1から7のいずれかに記載の偏光板とを含む、画像表示装置。
- 画像表示セルと、請求項8に記載の偏光板のセットと、を含み、
該偏光板のセットにおける一方の偏光板が該画像表示セルの視認側に配置され、他方の偏光板が該画像表示セルの背面側に配置されている、
画像表示装置。
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