WO2021100381A1 - 光学積層体及び表示装置 - Google Patents

光学積層体及び表示装置 Download PDF

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Publication number
WO2021100381A1
WO2021100381A1 PCT/JP2020/039136 JP2020039136W WO2021100381A1 WO 2021100381 A1 WO2021100381 A1 WO 2021100381A1 JP 2020039136 W JP2020039136 W JP 2020039136W WO 2021100381 A1 WO2021100381 A1 WO 2021100381A1
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Prior art keywords
sensitive adhesive
pressure
adhesive layer
layer
optical laminate
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PCT/JP2020/039136
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English (en)
French (fr)
Japanese (ja)
Inventor
昇祐 李
正熙 金
Original Assignee
住友化学株式会社
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Priority to CN202080079505.5A priority Critical patent/CN114730036A/zh
Priority to KR1020217000166A priority patent/KR102312066B1/ko
Publication of WO2021100381A1 publication Critical patent/WO2021100381A1/ja

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/022—Mechanical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/023—Optical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J201/00—Adhesives based on unspecified macromolecular compounds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • C09J7/38—Pressure-sensitive adhesives [PSA]
    • 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
    • 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
    • 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
    • H10K59/50—OLEDs integrated with light modulating elements, e.g. with electrochromic elements, photochromic elements or liquid crystal elements

Definitions

  • the present invention relates to an optical laminate and a display device.
  • Patent Document 1 Japanese Unexamined Patent Publication No. 2018-027995 (Patent Document 1) describes a flexible image display device provided with an adhesive layer having excellent stress relaxation characteristics.
  • the optical laminate in which a plurality of layers are laminated via the pressure-sensitive adhesive layer has a problem that bubbles are likely to be generated in the pressure-sensitive adhesive layer or between the pressure-sensitive adhesive layer and the layer in contact with the pressure-sensitive adhesive layer when bent. ..
  • An object of the present invention is to provide an optical laminate in which the generation of bubbles is suppressed when bent, and a display device including the optical laminate.
  • the present invention provides an optical laminate and a display device illustrated below.
  • a front plate, a first pressure-sensitive adhesive layer, a polarizing plate, a second pressure-sensitive adhesive layer, and a back plate are provided in this order.
  • an optical laminate in which the generation of bubbles is suppressed when bent, and a display device including the optical laminate.
  • FIG. 1 is a schematic cross-sectional view of an optical laminate according to an embodiment of the present invention.
  • the optical laminate 100 shown in FIG. 1 includes a front plate 101, a first pressure-sensitive adhesive layer 102, a polarizing plate 103, a second pressure-sensitive adhesive layer 104, and a back plate 105 in this order.
  • the first pressure-sensitive adhesive layer 102 and the second pressure-sensitive adhesive layer 104 may be collectively referred to as a pressure-sensitive adhesive layer.
  • the thickness of the optical laminate 100 is not particularly limited because it varies depending on the function required for the optical laminate, the application of the optical laminate, etc., but is, for example, 30 ⁇ m or more and 3000 ⁇ m or less, preferably 50 ⁇ m or more and 2000 ⁇ m or less. It is preferably 70 ⁇ m or more and 1000 ⁇ m or less.
  • the plan view shape of the optical laminate 100 may be, for example, a square shape, preferably a square shape having a long side and a short side, and more preferably a rectangle.
  • the length of the long side may be, for example, 10 mm or more and 1400 mm or less, preferably 50 mm or more and 600 mm or less.
  • the length of the short side is, for example, 5 mm or more and 800 mm or less, preferably 30 mm or more and 500 mm or less, and more preferably 50 mm or more and 300 mm or less.
  • Each layer constituting the optical laminate 100 may have corners R-processed, end portions notched, or perforated.
  • the optical laminate 100 can be used, for example, in a display device or the like.
  • the display device is not particularly limited, and examples thereof include an organic electroluminescence (organic EL) display device, an inorganic electroluminescence (inorganic EL) display device, a liquid crystal display device, and an electroluminescent display device.
  • the optical laminate 100 is suitable for a display device capable of bending, particularly bending with the front plate on the outside.
  • the optical laminate 100 Is the following equation (1) and equation (2): 20 ⁇ GL 1' ⁇ 150 (1) 20 ⁇ G L2 ' ⁇ 150 ( 2) , And preferably the following formulas (1a) and (2a): 25 ⁇ GL 1' ⁇ 95 (1a) 25 ⁇ GL 2' ⁇ 95 (2a) Meet.
  • a stress-strain curve can be drawn with strain on the horizontal axis and stress on the vertical axis.
  • the stress generated in the pressure-sensitive adhesive layer also increases, and the stress becomes maximum immediately before the cohesive failure occurs in the pressure-sensitive adhesive layer.
  • G L 'are pressure-sensitive adhesive layer reflects up stress change at the time of plastic deformation as well as stress change upon elastic deformation, the adhesive layer may be an indicator of durability until cohesive failure.
  • G L 'is large stress generated against distortion of the pressure-sensitive adhesive layer is large, the pressure-sensitive adhesive layer has excellent cohesive force.
  • G L 'is small stress generated against distortion of the pressure-sensitive adhesive layer is small, the pressure-sensitive adhesive layer is easily deformed.
  • the optical laminate 100 satisfying the formulas (1) and (2) is in the pressure-sensitive adhesive layer, and the pressure-sensitive adhesive layer and the pressure-sensitive adhesive layer even if the bent state is maintained (hereinafter, referred to as “static bending”).
  • the generation of air bubbles between the layers in contact with the layer is suppressed.
  • statically bent means that bubbles are not generated within 24 hours even if the optical laminate is subjected to the static bending durability test described later.
  • the occurrence of floating or peeling between the pressure-sensitive adhesive layer and the layer in contact with the pressure-sensitive adhesive layer is also suppressed.
  • the generation of bubbles can be determined by observation under an optical microscope.
  • bending includes a form of bending in which a curved surface is formed in a bent portion, and the radius of curvature of the bent inner surface is not particularly limited. Bending also includes refraction with an inner surface refraction angle greater than 0 degrees and less than 180 degrees, and folding with an inner surface curvature radius close to zero or an inner surface refraction angle of 0 degrees.
  • G L ' the type and amount of monomers constituting the base polymer in the pressure-sensitive adhesive composition for use in the pressure-sensitive adhesive layer; polymerization initiator, the type of crosslinking agent and other additives and amount; the active energy ray,
  • the base polymer contained in the adhesive composition when containing a large number of 10 or more long chain alkyl (meth) acrylic monomer carbon, G L 'tends to decrease.
  • the pressure-sensitive adhesive composition containing a large amount of polymerizable compound in G L 'tends to be increased.
  • the optical laminate 100 has the following formula (3): GL1 ' ⁇ GL2 ' (3) Satisfying, preferably the following formula (3'): GL1 '> GL2 '(3') Meet.
  • the pressure-sensitive adhesive layer on the inner diameter side further relaxes the stress generated on the inner diameter side of the optical laminate 100, so that the optical laminate 100 is easy to bend. Therefore, the generation of air bubbles in the pressure-sensitive adhesive layer and between the pressure-sensitive adhesive layer and the layer in contact with the pressure-sensitive adhesive layer is suppressed, and the bending durability of the optical laminate 100 can be improved.
  • the optical laminate 100 preferably has the following formula (4): 0.20 ⁇ ⁇ 2 ⁇ 0.70 (4) The following formula (4a): 0.20 ⁇ ⁇ 2 ⁇ 0.55 (4a) Meet.
  • the optical laminate 100 preferably has the following formula (4'): 0.20 ⁇ ⁇ 1 ⁇ 0.70 (4') , More preferably the following equation (4'a): 0.20 ⁇ ⁇ 1 ⁇ 0.55 (4'a) Meet.
  • the stress relaxation rate of the pressure-sensitive adhesive layer is expressed as the ratio of the stress after a lapse of a predetermined time to the stress generated immediately after pulling when the pressure-sensitive adhesive layer is subjected to a tensile test.
  • the stress relaxation rate is small, the stress generated in the pressure-sensitive adhesive layer is easily relaxed.
  • the stress relaxation rate of the pressure-sensitive adhesive layer is within the above range, the optical laminate 100 is unlikely to generate air bubbles in the pressure-sensitive adhesive layer even if it is statically bent. Further, since the adhesion between the pressure-sensitive adhesive layer and the layer in contact with the pressure-sensitive adhesive layer is also excellent, the generation of air bubbles between the pressure-sensitive adhesive layers is suppressed.
  • the stress relaxation rate can be determined according to the method described in the column of Examples described later.
  • the optical laminate 100 preferably has the following formula (5): ⁇ 1 ⁇ ⁇ 2 (5) , More preferably the following equation (5'): ⁇ 1> ⁇ 2 (5') Meet.
  • the second pressure-sensitive adhesive layer 104 further relaxes the stress generated on the inner diameter side of the optical laminate, so that the optical laminate 100 is easy to bend. The generation of air bubbles in the pressure-sensitive adhesive layer and between the pressure-sensitive adhesive layer and the layer in contact with the pressure-sensitive adhesive layer is easily suppressed.
  • the optical laminate 100 preferably has the following formula (6): 1.5 ⁇ ⁇ 2 ⁇ 20 (6)
  • the optical laminate 100 preferably has the following formula (6'): 1.5 ⁇ ⁇ 1 ⁇ 20 (6') , More preferably the following equation (6'a): 3.0 ⁇ ⁇ 1 ⁇ 10 (6'a) Meet.
  • the creep rate of the pressure-sensitive adhesive layer is the maximum deformation rate when the pressure-sensitive adhesive layer is pulled with a constant force for a certain period of time. When the creep rate is high, the adhesive layer is easily deformed. When the creep rate of the pressure-sensitive adhesive layer is within the above range, the optical laminate 100 is unlikely to generate air bubbles in the pressure-sensitive adhesive layer even if it is statically bent. Further, since the adhesive layer and the layer in contact with the adhesive layer have excellent adhesion, the generation of air bubbles between the layers is suppressed.
  • the creep rate can be determined according to the method described in the column of Examples described later.
  • the optical laminate 100 preferably has the following formula (7): ⁇ 1 ⁇ ⁇ 2 (7) , More preferably the following equation (7'): ⁇ 1 ⁇ 2 (7') Meet.
  • the second pressure-sensitive adhesive layer 104 further relaxes the stress generated on the inner diameter side of the optical laminate, so that the optical laminate 100 is easy to bend. The generation of air bubbles in the pressure-sensitive adhesive layer and between the pressure-sensitive adhesive layer and the layer in contact with the pressure-sensitive adhesive layer is easily suppressed.
  • the optical laminate 100 preferably has the following formula (8): 2.5 ⁇ R2 ⁇ 20 (8) The following formula (8a): 3.0 ⁇ R2 ⁇ 10 (8a) Meet.
  • the optical laminate 100 preferably has the following formula (8'): 2.5 ⁇ R1 ⁇ 20 (8') , More preferably the following equation (8'a): 3.0 ⁇ R1 ⁇ 10 (8'a) Meet.
  • the deformation restoration rate of the pressure-sensitive adhesive layer indicates the rate at which the pressure-sensitive adhesive layer shrinks after a lapse of a predetermined time from unloading in the tensile test of the pressure-sensitive adhesive layer.
  • the deformation restoration rate is large, the pressure-sensitive adhesive layer is excellent in shrinkage after stretching.
  • the deformation restoration rate of the pressure-sensitive adhesive layer is within the above range, the optical laminate 100 is unlikely to generate air bubbles in the pressure-sensitive adhesive layer even if it is statically bent. Further, since the adhesive layer and the layer in contact with the adhesive layer have excellent adhesion, the generation of air bubbles between the layers is suppressed.
  • the deformation restoration rate can be obtained according to the method described in the column of Examples described later.
  • the optical laminate 100 preferably has the following formula (9): R1 ⁇ R2 (9) , More preferably the following equation (9'): R1> R2 (9') Meet.
  • the first pressure-sensitive adhesive layer 102 further relaxes the stress generated on the outer diameter side of the optical laminate 100, so that the optical laminate 100 is easy to bend. Therefore, the generation of air bubbles in the pressure-sensitive adhesive layer and between the pressure-sensitive adhesive layer and the layer in contact with the pressure-sensitive adhesive layer is easily suppressed.
  • the stress relaxation rate, creep rate, and deformation restoration rate of the pressure-sensitive adhesive layer are the types and amounts of monomers constituting the base polymer contained in the pressure-sensitive adhesive composition used for the pressure-sensitive adhesive layer; addition of a polymerization initiator, a cross-linking agent, and the like.
  • the desired numerical range can be obtained by adjusting the type and blending amount of the agent; active energy rays, heat and other factors that change the degree of cross-linking.
  • the glass transition temperature of the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer is preferably ⁇ 70 ° C. or higher and ⁇ 40 ° C. or lower, respectively.
  • the glass transition temperature of the pressure-sensitive adhesive layer is ⁇ 40 ° C. or lower, the flexibility of the pressure-sensitive adhesive layer is good, so that the optical laminate 100 can be easily bent.
  • the glass transition temperature of the pressure-sensitive adhesive layer is lower than ⁇ 70 ° C., the cohesive force of the pressure-sensitive adhesive layer becomes low, and the adhesive strength under durable conditions may decrease.
  • the glass transition temperature of the pressure-sensitive adhesive layer can be measured according to the method described in the column of Examples described later.
  • the glass transition temperature of the pressure-sensitive adhesive layer is determined by the type and blending amount of the monomers constituting the base polymer contained in the pressure-sensitive adhesive composition; the type and blending amount of the polymerization initiator, the cross-linking agent and other additives; By adjusting the factors that change the degree of cross-linking of the above, the desired numerical range can be obtained.
  • the base polymer contained in the pressure-sensitive adhesive composition has a glass transition temperature as a homopolymer of ⁇ 40 ° C. or lower, preferably ⁇ 45 ° C. or lower, more preferably. Is preferably blended with an acrylic acid monomer of ⁇ 50 ° C. or lower.
  • Examples of such monomers include n-butyl acrylate (T g : -55 ° C.), n-octyl acrylate (T g : -65 ° C.), isooctyl acrylate (T g : -58 ° C.), and acrylic acid.
  • 2-Ethylhexyl (T g : -70 ° C), Isononyl acrylate (T g : -58 ° C), Isodecyl acrylate (T g : -60 ° C), Isodecyl methacrylate (T g : -41 ° C), Methacrylic acid Examples include n-lauryl (T g : -65 ° C.), tridecyl acrylate (T g : -55 ° C.), tridecyl methacrylate (T g : -40 ° C.), n-butyl acrylate and 2-ethylhexyl acrylate. Is preferable. These monomers may be used alone or in combination of two or more.
  • the base polymer contained in the pressure-sensitive adhesive composition preferably contains a monomer having a glass transition temperature of ⁇ 40 ° C. or lower as a homopolymer in an amount of preferably 80% by mass or more, more preferably 85% by mass or more, still more preferably 95% by mass or more. To do. Further, as the base polymer contained in the pressure-sensitive adhesive composition, a monomer having a glass transition temperature of ⁇ 40 ° C. or lower as a homopolymer is preferably 99.9% by mass or less, more preferably 99.5% by mass or less, still more preferably. Contains 99% by mass or less. When the content of the monomer having a glass transition temperature of ⁇ 40 ° C. or lower as a homopolymer is in such a range, the glass transition temperature of the pressure-sensitive adhesive layer tends to fall within the above range.
  • the base polymer contained in the pressure-sensitive adhesive composition preferably contains as few monomers as homopolymers having a glass transition temperature exceeding 0 ° C. , Such a monomer is preferably contained in an upper limit of 15% by mass or less, more preferably 10% by mass or less, and further preferably 5% by mass or less.
  • the material and thickness of the front plate 101 are not limited as long as it is a plate-like body capable of transmitting light.
  • the front plate may be composed of only one layer, or may be composed of two or more layers.
  • Examples of the front plate 101 include a resin plate-like body (for example, a resin plate, a resin sheet, a resin film, etc.) and a glass plate-like body (for example, a glass plate, a glass film, etc.).
  • the front plate may be a laminate of a resin plate-like body and a glass plate-like body.
  • the front plate 101 can form the outermost surface of the display device.
  • the thickness of the front plate 101 may be, for example, 10 ⁇ m or more and 300 ⁇ m or less, preferably 20 ⁇ m or more and 200 ⁇ m or less, and more preferably 30 ⁇ m or more and 100 ⁇ m or less.
  • the thickness of each layer constituting the optical laminate 100 can be measured according to the thickness measuring method described in Examples described later.
  • the resin plate-like body is not limited as long as it can transmit light.
  • the resin constituting the resin plate-like body include triacetyl cellulose, acetyl cellulose butyrate, ethylene-vinyl acetate copolymer, propionyl cellulose, butyryl cellulose, acetyl propionyl cellulose, polyester, polystyrene, polyamide, and polyether.
  • the resin plate-like body is preferably a resin film formed of a polymer such as polyimide, polyamide, or polyamideimide.
  • the front plate 101 may be a resin film provided with a hard coat layer.
  • the hard coat layer may be formed on one surface of the resin film or may be formed on both sides.
  • the hard coat layer is, for example, a cured layer of an ultraviolet curable resin.
  • the ultraviolet curable resin include acrylic resin, silicone resin, polyester resin, urethane resin, amide resin, epoxy resin and the like.
  • the hard coat layer may contain additives to improve hardness.
  • the additive is not particularly limited, and examples thereof include inorganic fine particles, organic fine particles, or a mixture thereof.
  • the front plate 101 is a glass plate
  • tempered glass for a display is preferably used as the glass plate.
  • the thickness of the glass plate may be, for example, 10 ⁇ m or more and 1000 ⁇ m or less, or 20 ⁇ m or more and 500 ⁇ m or less.
  • the front plate 101 not only has a function of protecting the front surface (screen) of the display device (function as a window film), but also functions as a touch sensor and blue light cut. It may have a function, a viewing angle adjusting function, and the like.
  • the first pressure-sensitive adhesive layer 102 is interposed between the front plate 101 and the polarizing plate 103, and these are bonded together.
  • the first pressure-sensitive adhesive layer 102 may be one layer or two or more layers, but is preferably one layer.
  • the first pressure-sensitive adhesive layer 102 is composed of a pressure-sensitive adhesive composition containing (meth) acrylic resin, rubber-based resin, urethane-based resin, ester-based resin, silicone-based resin, and polyvinyl ether-based resin as main components (base polymer). can do.
  • a pressure-sensitive adhesive composition containing (meth) acrylic resin, rubber-based resin, urethane-based resin, ester-based resin, silicone-based resin, and polyvinyl ether-based resin as main components (base polymer).
  • base polymer base polymer
  • the pressure-sensitive adhesive composition may be an active energy ray-curable type or a thermosetting type.
  • Examples of the (meth) acrylic resin used in the pressure-sensitive adhesive composition include (meth) butyl (meth) acrylate, ethyl (meth) acrylate, isooctyl (meth) acrylate, and 2-ethylhexyl (meth) acrylate.
  • a polymer or copolymer containing one or more acrylic ester as a monomer is preferably used. It is preferable that the base polymer is copolymerized with a polar monomer.
  • Examples of the polar monomer include (meth) acrylate compound, (meth) 2-hydroxypropyl acrylate compound, (meth) hydroxyethyl acrylate compound, (meth) acrylamide compound, and N, N-dimethylaminoethyl (meth) acrylate compound.
  • a photoreactive compound having a benzoyl group can also be used as the monomer constituting the (meth) acrylic resin, and the compound described as Chemical Formula 1 in Korean Patent Publication No. 10-2019-0005427 is exemplified. Such photoreactive compounds are activated by additional photocuring to induce additional cross-linking, so that durability can be improved.
  • the pressure-sensitive adhesive composition may contain only the above-mentioned base polymer, but usually further contains a cross-linking agent.
  • the cross-linking agent is a metal ion having a divalent value or higher and forming a carboxylic acid metal salt with the carboxyl group, a polyamine compound forming an amide bond with the carboxyl group, and a carboxyl group. Examples thereof include a polyepoxy compound that forms an ester bond with, a polyol, and a polyisocyanate compound that forms an amide bond with a carboxyl group.
  • the cross-linking agent is preferably a polyisocyanate compound.
  • the active energy ray-curable pressure-sensitive adhesive composition has a property of being cured by being irradiated with active energy rays such as ultraviolet rays and electron beams, and has adhesiveness even before irradiation with active energy rays, such as a film. It has the property that it can be brought into close contact with the adherend of the above, and can be cured by irradiation with active energy rays to adjust the adhesion.
  • the active energy ray-curable pressure-sensitive adhesive composition is preferably an ultraviolet-curable type.
  • the active energy ray-curable pressure-sensitive adhesive composition further contains an active energy ray-polymerizable compound in addition to the base polymer and the cross-linking agent. If necessary, a photopolymerization initiator, a photosensitizer, or the like may be contained.
  • the active energy ray-polymerizable compound is, for example, a (meth) acrylate monomer having at least one (meth) acryloyloxy group in the molecule; obtained by reacting two or more kinds of functional group-containing compounds, and at least 2 in the molecule.
  • examples thereof include (meth) acrylic compounds such as (meth) acryloyloxy group-containing compounds such as (meth) acrylate oligomers having individual (meth) acryloyloxy groups.
  • the pressure-sensitive adhesive composition can contain 0.1 part by mass or more of the active energy ray-polymerizable compound with respect to 100 parts by mass of the solid content of the pressure-sensitive adhesive composition, and is 10 parts by mass or less, 5 parts by mass or less, or 2 parts by mass. Can include less than one copy.
  • the photopolymerization initiator examples include benzophenone, benzyl dimethyl ketal, 1-hydroxycyclohexyl ketone and the like.
  • the photopolymerization initiator may contain one kind or two or more kinds.
  • the total content thereof may be, for example, 0.01 part by mass or more and 3.0 parts by mass or less with respect to 100 parts by mass of the solid content of the pressure-sensitive adhesive composition.
  • the pressure-sensitive adhesive composition includes fine particles for imparting light scattering, beads (resin beads, glass beads, etc.), glass fibers, resins other than the base polymer, pressure-sensitive adhesives, fillers (metal powders and other inorganic powders). Etc.), antioxidants, UV absorbers, dyes, pigments, colorants, antifoaming agents, corrosion inhibitors, photopolymerization initiators and other additives can be included.
  • the first pressure-sensitive adhesive layer 102 can be formed by applying an organic solvent diluent of the pressure-sensitive adhesive composition on a substrate and drying it.
  • the first pressure-sensitive adhesive layer 102 can also be formed by using a pressure-sensitive adhesive sheet formed by using the pressure-sensitive adhesive composition.
  • the formed pressure-sensitive adhesive layer can be irradiated with active energy rays to obtain a pressure-sensitive adhesive layer having a desired degree of curing.
  • the thickness of the first pressure-sensitive adhesive layer 102 is not particularly limited, but is preferably 1 ⁇ m or more and 100 ⁇ m or less, more preferably 3 ⁇ m or more and 50 ⁇ m or less, and may be 20 ⁇ m or more.
  • the shear modulus at a temperature of 25 ° C. is preferably 0.01 MPa. It is more preferably 0.02 MPa or more, preferably 0.50 MPa or less, more preferably 0.10 MPa or less, and may be 0.08 MPa or less.
  • the shear modulus of the first pressure-sensitive adhesive layer 102 is within this range, the optical laminate 100 is less likely to undergo cohesive failure even when bent, and is less likely to generate air bubbles.
  • the shear modulus can be adjusted by changing the type and content of the monomers constituting the base polymer contained in the pressure-sensitive adhesive composition, the additives, the degree of cross-linking, and the like.
  • the polarizing plate 103 may be, for example, a linear polarizing plate, a circular polarizing plate, an elliptical polarizing plate, or the like.
  • the circular polarizing plate includes a linear polarizing plate and a retardation layer. Since the circularly polarizing plate can absorb the external light reflected in the image display device, it is possible to impart the function as an antireflection film to the optical laminate 100.
  • the thickness of the polarizing plate 103 is usually 5 ⁇ m or more, may be 20 ⁇ m or more, 25 ⁇ m or more, or 30 ⁇ m or more.
  • the thickness of the polarizing plate 103 is preferably 80 ⁇ m or less, and more preferably 60 ⁇ m or less.
  • the linear polarizing plate has a function of selectively transmitting unidirectional linearly polarized light composed of unpolarized light rays such as natural light.
  • the linear polarizing plate contains a stretched film or stretched layer on which a dichroic dye is adsorbed, a cured product of a polymerizable liquid crystal compound, and a dichroic dye, and the dichroic dye is dispersed in the cured product of the polymerizable liquid crystal compound.
  • An oriented liquid crystal layer or the like can be provided as a polarizer layer.
  • the dichroic dye refers to a dye having a property in which the absorbance in the major axis direction and the absorbance in the minor axis direction of the molecule are different.
  • a linear polarizing plate using a liquid crystal layer as a polarizer layer is preferable because there is no limitation in the bending direction as compared with a stretched film or a stretched layer on which a dichroic dye is adsorbed.
  • the polarizer layer which is a stretched film on which a bicolor dye is adsorbed, is usually obtained by dyeing the polyvinyl alcohol-based resin film with a bicolor dye such as iodine in a step of uniaxially stretching the polyvinyl alcohol-based resin film. It can be produced through a step of adsorbing a bicolor dye, a step of treating a polyvinyl alcohol-based resin film on which the bicolor dye is adsorbed with an aqueous boric acid solution, and a step of washing with water after the treatment with the aqueous boric acid solution.
  • the thickness of the polarizer layer is usually 30 ⁇ m or less, preferably 18 ⁇ m or less, and more preferably 15 ⁇ m or less. Reducing the thickness of the polarizer layer is advantageous for thinning the polarizing plate 103.
  • the thickness of the polarizer layer is usually 1 ⁇ m or more, and may be, for example, 5 ⁇ m or more.
  • the polyvinyl alcohol-based resin is obtained by saponifying the polyvinyl acetate-based resin.
  • the polyvinyl acetate-based resin in addition to polyvinyl acetate which is a homopolymer of vinyl acetate, a copolymer of vinyl acetate and another monomer copolymerizable therewith is used.
  • examples of other monomers copolymerizable with vinyl acetate include unsaturated carboxylic acid compounds, olefin compounds, vinyl ether compounds, unsaturated sulfone compounds, and (meth) acrylamide compounds having an ammonium group. ..
  • the degree of saponification of the polyvinyl alcohol-based resin is usually about 85 mol% or more and 100 mol% or less, preferably 98 mol% or more.
  • the polyvinyl alcohol-based resin may be modified, and polyvinyl formal, polyvinyl acetal, and the like modified with aldehydes can also be used.
  • the degree of polymerization of the polyvinyl alcohol-based resin is usually 1000 or more and 10000 or less, preferably 1500 or more and 5000 or less.
  • the polarizer layer which is a stretched layer on which a bicolor dye is adsorbed, is usually a step of applying a coating liquid containing the polyvinyl alcohol-based resin on a base film, a step of uniaxially stretching the obtained laminated film, and a uniaxial A step of dyeing the polyvinyl alcohol-based resin layer of the stretched laminated film with a dichroic dye to adsorb the dichroic dye to form a polarizer layer, and boric acid on the film on which the dichroic dye is adsorbed. It can be produced through a step of treating with an aqueous solution and a step of washing with water after treatment with an aqueous boric acid solution.
  • the base film used for forming the polarizer layer may be used as a protective layer for the polarizer layer. If necessary, the base film may be peeled off from the polarizer layer.
  • the material and thickness of the base film may be the same as the material and thickness of the thermoplastic resin film described later.
  • the stretched film on which the dichroic dye is adsorbed or the polarizer layer which is a stretched layer may be used as it is as a linear polarizing plate, or a protective layer may be formed on one or both sides thereof and used as a linear polarizing plate.
  • a protective layer a thermoplastic resin film described later can be used.
  • the thickness of the obtained linear polarizing plate is preferably 2 ⁇ m or more and 40 ⁇ m or less.
  • the thermoplastic resin film is, for example, a cyclopolyolefin resin film; a cellulose acetate resin film made of a resin such as triacetyl cellulose or diacetyl cellulose; a polyester resin film made of a resin such as polyethylene terephthalate, polyethylene naphthalate, or polybutylene terephthalate; Examples of films known in the art such as polycarbonate-based resin films; (meth) acrylic-based resin films; polypropylene-based resin films and the like can be mentioned.
  • the polarizer layer and the protective layer can be laminated via a bonding layer described later.
  • the thickness of the thermoplastic resin film is usually 100 ⁇ m or less, preferably 80 ⁇ m or less, more preferably 60 ⁇ m or less, still more preferably 40 ⁇ m or less, still more preferably 30 ⁇ m or less. Yes, it is usually 5 ⁇ m or more, preferably 10 ⁇ m or more.
  • a hard coat layer may be formed on the thermoplastic resin film.
  • the hard coat layer may be formed on one side of the thermoplastic resin film, or may be formed on both sides. By providing the hard coat layer, a thermoplastic resin film having improved hardness and scratch resistance can be obtained.
  • the hard coat layer can be formed in the same manner as the hard coat layer formed on the resin film described above.
  • the polymerizable liquid crystal compound used for forming the liquid crystal layer is a compound having a polymerizable reactive group and exhibiting liquid crystallinity.
  • the polymerizable reactive group is a group involved in the polymerization reaction, and is preferably a photopolymerizable reactive group.
  • the photopolymerizable reactive group refers to a group that can participate in the polymerization reaction by an active radical, an acid, or the like generated from the photopolymerization initiator.
  • Examples of the photopolymerizable functional group include a vinyl group, a vinyloxy group, a 1-chlorovinyl group, an isopropenyl group, a 4-vinylphenyl group, an acryloyloxy group, a methacryloyloxy group, an oxylanyl group, an oxetanyl group and the like.
  • an acryloyloxy group, a methacryloyloxy group, a vinyloxy group, an oxylanyl group and an oxetanyl group are preferable, and an acryloyloxy group is more preferable.
  • the type of the polymerizable liquid crystal compound is not particularly limited, and a rod-shaped liquid crystal compound, a disk-shaped liquid crystal compound, and a mixture thereof can be used.
  • the liquid crystal property of the polymerizable liquid crystal compound may be a thermotropic liquid crystal or a lyotropic liquid crystal, and the phase-ordered structure may be a nematic liquid crystal or a smectic liquid crystal.
  • the dichroic dye used for the polarizer layer which is a liquid crystal layer, preferably has an absorption maximum wavelength ( ⁇ MAX) in the range of 300 to 700 nm.
  • a dichroic dye include an acrydin dye, an oxazine dye, a cyanine dye, a naphthalene dye, an azo dye, an anthraquinone dye and the like, and among them, the azo dye is preferable.
  • the azo dye include a monoazo dye, a bisazo dye, a trisazo dye, a tetrakisazo dye, a stillbenazo dye and the like, and a bisazo dye and a trisazo dye are preferable.
  • the dichroic dye may be used alone or in combination of two or more, but it is preferable to combine three or more. In particular, it is more preferable to combine three or more kinds of azo compounds.
  • a part of the dichroic dye may have a reactive group or may have a liquid crystallinity.
  • a composition for forming a polarizing layer containing a polymerizable liquid crystal compound and a dichroic dye is applied onto an alignment film formed on a base film, and the polymerizable liquid crystal compound is polymerized. It can be formed by curing it.
  • a polarizer layer may be formed by applying a composition for forming a polarizer layer on a substrate film to form a coating film, and then stretching the coating film together with the substrate film.
  • the base film used for forming the polarizer layer may be used as a protective layer for the polarizer layer.
  • the material and thickness of the base film may be the same as the material and thickness of the thermoplastic resin film described above.
  • compositions for forming a polarizer layer containing a polymerizable liquid crystal compound and a dichroic dye examples include JP-A-2013-373353 and JP-A-2013-33249. , JP-A-2017-83843, etc. can be exemplified.
  • additives such as a solvent, a polymerization initiator, a cross-linking agent, a leveling agent, an antioxidant, a plasticizer, and a sensitizer are further added. It may be included. Only one of these components may be used, or two or more of these components may be used in combination.
  • the polymerization initiator that may be contained in the composition for forming a polarizer layer is a compound that can initiate a polymerization reaction of a polymerizable liquid crystal compound, and is photopolymerized in that the polymerization reaction can be initiated under lower temperature conditions.
  • Sex initiators are preferred. Specific examples thereof include photopolymerization initiators capable of generating active radicals or acids by the action of light, and among them, photopolymerization initiators that generate radicals by the action of light are preferable.
  • the content of the polymerization initiator is preferably 1 part by mass or more and 10 parts by mass or less, and more preferably 3 parts by mass or more and 8 parts by mass or less, based on 100 parts by mass of the total amount of the polymerizable liquid crystal compound. Within this range, the reaction of the polymerizable group proceeds sufficiently, and the orientation state of the liquid crystal compound is likely to be stabilized.
  • the thickness of the polarizer layer which is a liquid crystal layer, is usually 10 ⁇ m or less, preferably 0.5 ⁇ m or more and 8 ⁇ m or less, and more preferably 1 ⁇ m or more and 5 ⁇ m or less.
  • the polarizer layer which is a liquid crystal layer, may be used as a linear polarizing plate without peeling and removing the base film, or may be used as a linear polarizing plate by peeling and removing the base film from the polarizer layer.
  • the polarizing element layer which is a liquid crystal layer, may be used as a linear polarizing plate by forming a protective layer on one side or both sides thereof.
  • the protective layer the above-mentioned thermoplastic resin film can be used.
  • the polarizing element layer which is a liquid crystal layer, may have an overcoat layer on one side or both sides of the polarizing element layer for the purpose of protecting the polarizer layer.
  • the overcoat layer can be formed, for example, by applying a material (composition) for forming the overcoat layer on the polarizer layer.
  • the material constituting the overcoat layer include a photocurable resin and a water-soluble polymer.
  • a (meth) acrylic resin, a polyvinyl alcohol-based resin, or the like can be used as a material constituting the overcoat layer.
  • the polarizing plate 103 is arranged so that the linear polarizing plate is on the side of the first pressure-sensitive adhesive layer 102 with respect to the retardation layer.
  • the outermost layer constituting the polarizing plate 103 and in contact with the first pressure-sensitive adhesive layer 102 is preferably a base film, a protective layer or an overcoat layer contained in the linear polarizing plate.
  • the retardation layer may be one layer or two or more layers.
  • the retardation layer may have an overcoat layer that protects the surface thereof, a base film that supports the retardation layer, and the like.
  • the retardation layer includes a ⁇ / 4 layer, and may further include at least one of a ⁇ / 2 layer and a positive C layer.
  • the retardation layer includes a ⁇ / 2 layer, the ⁇ / 2 layer and the ⁇ / 4 layer are laminated in order from the linear polarizing plate side.
  • the ⁇ / 4 layer and the positive C layer may be laminated in order from the linear polarizing plate side, or the positive C layer and the ⁇ / 4 layer may be laminated in order from the linear polarizing plate side. May be good.
  • the thickness of the retardation layer is, for example, 0.1 ⁇ m or more and 10 ⁇ m or less, preferably 0.5 ⁇ m or more and 8 ⁇ m or less, and more preferably 1 ⁇ m or more and 6 ⁇ m or less.
  • the retardation layer may be formed from the resin film exemplified as the material of the protective layer, or may be formed from a layer in which the polymerizable liquid crystal compound is cured.
  • the retardation layer may further include an alignment film.
  • the retardation layer may have a bonding layer for bonding the ⁇ / 4 layer, the ⁇ / 2 layer, and the positive C layer.
  • the retardation layer can be formed by applying a composition containing the polymerizable liquid crystal compound to a base film and curing it.
  • An alignment film may be formed between the base film and the coating layer.
  • the material and thickness of the base film may be the same as the material and thickness of the thermoplastic resin film.
  • the second pressure-sensitive adhesive layer 104 is interposed between the polarizing plate 103 and the back plate 105 to bond them together.
  • the second pressure-sensitive adhesive layer 104 may be one layer or may be composed of two or more layers, but is preferably one layer.
  • the additives to be obtained, the method for producing the second pressure-sensitive adhesive layer, the thickness of the second pressure-sensitive adhesive layer, and the like are the same as those shown in the above description of the first pressure-sensitive adhesive layer 102.
  • the second pressure-sensitive adhesive layer 104 may be the same as or different from the first pressure-sensitive adhesive layer 102 in terms of the composition, composition, thickness, and the like of the pressure-sensitive adhesive composition.
  • the shear modulus at a temperature of 25 ° C. is preferably 0.01 MPa. It is more preferably 0.02 MPa or more, preferably 0.50 MPa or less, more preferably 0.10 MPa or less, and may be 0.08 MPa or less.
  • the shear modulus of the second pressure-sensitive adhesive layer 104 is within this range, the optical laminate 100 is less likely to undergo cohesive failure even when bent, and is less likely to generate air bubbles.
  • the shear modulus can be adjusted by changing the type and content of the monomers constituting the base polymer contained in the pressure-sensitive adhesive composition, the additives, the degree of cross-linking, and the like.
  • the optical laminate 100 can include a laminating layer for joining the two layers.
  • the bonding layer is a layer composed of a pressure-sensitive adhesive or an adhesive.
  • the pressure-sensitive adhesive used as the material of the bonding layer the same pressure-sensitive adhesive composition as the pressure-sensitive adhesive composition constituting the first pressure-sensitive adhesive layer 102 can be used.
  • the bonding layer is different from other adhesives, for example, the adhesives constituting the first adhesive layer 102 (meth) acrylic adhesive, styrene adhesive, silicone adhesive, rubber adhesive, urethane adhesive. Adhesives, polyester adhesives, epoxy copolymer adhesives and the like can also be used.
  • the adhesive used as the material of the bonding layer can be formed by combining one or more of, for example, a water-based adhesive, an active energy ray-curable adhesive, and the like.
  • a water-based adhesive include a polyvinyl alcohol-based resin aqueous solution, a water-based two-component urethane-based emulsion adhesive, and the like.
  • the active energy ray-curable adhesive is an adhesive that cures by irradiating with active energy rays such as ultraviolet rays, and is, for example, an adhesive containing a polymerizable compound and a photopolymerizable initiator, and an adhesive containing a photoreactive resin.
  • Adhesives containing a binder resin and a photoreactive cross-linking agent Adhesives containing a binder resin and a photoreactive cross-linking agent, and the like.
  • the polymerizable compound include photopolymerizable monomers such as a photocurable epoxy monomer, a photocurable acrylic monomer, and a photocurable urethane monomer, and oligomers derived from these monomers.
  • the photopolymerization initiator include compounds containing substances that generate active species such as neutral radicals, anionic radicals, and cationic radicals by irradiating them with active energy rays such as ultraviolet rays.
  • the thickness of the bonded layer may be, for example, 1 ⁇ m or more, preferably 1 ⁇ m or more and 25 ⁇ m or less, more preferably 2 ⁇ m or more and 15 ⁇ m or less, and further preferably 2.5 ⁇ m or more and 5 ⁇ m or less.
  • the two opposing surfaces that are bonded via the bonding layer may be subjected to corona treatment, plasma treatment, flame treatment, etc. in advance, or may have a primer layer or the like.
  • Back plate As the back plate 105, a plate-like body capable of transmitting light, a component used in a normal display device, or the like can be used.
  • the thickness of the back plate 105 may be, for example, 5 ⁇ m or more and 2000 ⁇ m or less, preferably 10 ⁇ m or more and 1000 ⁇ m or less, and more preferably 15 ⁇ m or more and 500 ⁇ m or less.
  • the plate-like body used for the back plate 105 may be composed of only one layer, may be composed of two or more layers, and an example of the plate-like body described in the front plate 101 shall be used. Can be done.
  • Examples of the components used in the normal display device used for the back plate 105 include a touch sensor panel, an organic EL display element, and the like.
  • Examples of the stacking order of the components in the display device include a window film / circularly polarizing plate / touch sensor panel / organic EL display element, a window film / touch sensor panel / circularly polarizing plate / organic EL display element, and the like.
  • the touch sensor panel is not limited as long as it is a panel having a sensor (that is, a touch sensor) capable of detecting the touched position.
  • the detection method of the touch sensor is not limited, and touch sensor panels such as a resistive film method, a capacitance coupling method, an optical sensor method, an ultrasonic method, an electromagnetic induction coupling method, and a surface acoustic wave method are exemplified. Since the cost is low, a touch sensor panel of a resistance film type or a capacitance coupling type is preferably used.
  • a resistance film type touch sensor As an example of a resistance film type touch sensor, a pair of substrates arranged opposite to each other, an insulating spacer sandwiched between the pair of substrates, and a transparent conductive film provided as a resistance film on the inner front surface of each substrate. Examples thereof include a member composed of a film and a touch position detection circuit.
  • a touch position detection circuit In an image display device provided with a resistance film type touch sensor, when the surface of the front plate is touched, the opposing resistance films are short-circuited and a current flows through the resistance film.
  • the touch position detection circuit detects the change in voltage at this time, and the touched position is detected.
  • An example of a capacitance coupling type touch sensor is a member composed of a substrate, a transparent electrode for position detection provided on the entire surface of the substrate, and a touch position detection circuit.
  • a capacitance coupling type touch sensor when the surface of the front plate is touched, the transparent electrode is grounded via the capacitance of the human body at the touched point.
  • the touch position detection circuit detects the grounding of the transparent electrode, and the touched position is detected.
  • the thickness of the touch sensor panel may be, for example, 5 ⁇ m or more and 2000 ⁇ m or less, preferably 5 ⁇ m or more and 100 ⁇ m or less, more preferably 5 ⁇ m or more and 50 ⁇ m or less, and 5 ⁇ m or more and 20 ⁇ m or less.
  • the touch sensor panel may be a member in which a touch sensor pattern is formed on a base film.
  • the example of the base film may be the same as the example in the description of the thermoplastic resin film described above.
  • the touch sensor panel may be transferred from the base film to the adherend via the pressure-sensitive adhesive layer. That is, the touch sensor panel does not have to have a base film.
  • the thickness of the touch sensor pattern may be, for example, 1 ⁇ m or more and 20 ⁇ m or less.
  • the optical laminate 100 can be manufactured by a method including a step of laminating the layers constituting the optical laminate 100 via an adhesive layer.
  • a surface activation treatment such as corona treatment for the purpose of adjusting the adhesion.
  • the conditions for corona treatment can be set as appropriate, and the conditions may differ between one surface of the bonded surface and the other surface.
  • the display device includes the optical laminate 100.
  • the display device is not particularly limited, and examples thereof include an image display device such as an organic EL display device, an inorganic EL display device, a liquid crystal display device, and an electroluminescent display device.
  • a touch sensor may be further laminated on the optical laminate, and the display device may have a touch panel function.
  • the display device including the optical laminate of the present invention can be used as a flexible display that exhibits excellent durability against static bending and can be bent or wound.
  • the optical laminate 100 is arranged on the visible side of the display element of the display device with the front plate 101 facing outward (the side opposite to the display element side, that is, the visual recognition side).
  • the display device can be bent with the front plate 101 side facing outward.
  • the display device can be used as a mobile device such as a smartphone or tablet, a television, a digital photo frame, an electronic signage, a measuring instrument or an instrument, an office device, a medical device, a computer device, or the like.
  • acrylic polymers A1 to A6 isodecyl acrylate (IDA), N- (2-hydroxyethyl) acrylamide (HEAA), and benzophenone (BPO) were mixed in the amounts shown in Table 2 to form an adhesive composition.
  • Objects B1 to B9 were manufactured.
  • the pressure-sensitive adhesive compositions B1 to B9 were applied onto a release film A (polyethylene terephthalate film, thickness 38 ⁇ m) coated with a silicon release agent so as to have a thickness of 25 ⁇ m.
  • a release film B (polyethylene terephthalate film, thickness 38 ⁇ m) was bonded onto the release film B and irradiated with UV to prepare an adhesive sheet composed of the release film A / adhesive layer / release film B.
  • the conditions for UV irradiation were an integrated light intensity of 400 mJ / cm 2 and an illuminance of 1.8 mW / cm 2 (UVV standard).
  • the sources of the compounds used are as follows. 2-EHA: Tokyo Chemical Industry Co., Ltd., Japan n-BA: Tokyo Chemical Industry Co., Ltd., Japan HEAA: Tokyo Chemical Industry Co., Ltd., Japan IDA: Miwon specialty chemical, Korea BHA: Tokyo Chemical Industry Co., Ltd., Japan I-651 : BASF, Germany I-184: BASF, Germany BPO: Tokyo Chemical Industry Co., Ltd., Japan
  • the resin film was a polyimide resin film having a thickness of 40 ⁇ m.
  • the hard coat layer was a layer having a thickness of 10 ⁇ m and formed from a composition containing a dendrimer compound having a polyfunctional acrylic group at the end.
  • a circular polarizing plate was prepared as the polarizing plate 103.
  • a linear polarizing plate having a triacetyl cellulose (TAC) film (KC2UA, manufactured by Konica Minolta Co., Ltd., thickness 25 ⁇ m), an alignment film, a linear polarizing element layer, and an overcoat layer in this order was prepared.
  • the linear polarizer layer was formed using a composition containing a polymerizable liquid crystal compound and a dichroic dye, and had a thickness of 2 ⁇ m.
  • the overcoat layer was a polyvinyl alcohol resin layer and had a thickness of 1.0 ⁇ m.
  • a retardation laminate was laminated on the overcoat layer side of the linearly polarizing plate via an adhesive layer to obtain a circularly polarizing plate.
  • the retardation laminate had a ⁇ / 4 retardation layer, an adhesive layer, and a positive C layer in this order from the linear polarizing plate side.
  • the ⁇ / 4 retardation layer was a cured layer of a polymerizable liquid crystal compound and had a thickness of 3 ⁇ m.
  • the thickness of the pressure-sensitive adhesive layer was 5 ⁇ m.
  • the positive C layer was a cured layer of the polymerizable liquid crystal compound and had a thickness of 3 ⁇ m.
  • the back plate 105 a touch sensor in which a touch sensor pattern layer, an adhesive layer, and a base material layer are laminated in this order was prepared.
  • the touch sensor pattern layer included an ITO layer as a transparent conductive layer and a cured layer of an acrylic resin composition as a separation layer, and had a thickness of 7 ⁇ m.
  • the adhesive layer was provided on the separation layer side of the touch sensor pattern layer and had a thickness of 3 ⁇ m.
  • a cyclic olefin resin (COP) film ZF-14, manufactured by Nippon Zeon Corporation, thickness 23 ⁇ m was used as the base material layer.
  • the pressure-sensitive adhesive sheet composed of the pressure-sensitive adhesive composition shown in Table 2 is used as the first pressure-sensitive adhesive layer 102, and the side of the front plate 101 having no hard coat layer and the side of the polarizing plate 103 on the TAC film. was pasted together. Further, the pressure-sensitive adhesive sheet composed of the pressure-sensitive adhesive composition shown in Table 2 is used as the second pressure-sensitive adhesive layer 104 as shown in Table 3, and the retardation layer side of the circularly polarizing plate and the touch sensor pattern layer side of the touch sensor are used. They were laminated to prepare an optical laminate 100 (Examples 1 and 2 and Comparative Examples 1 to 3) having a layered structure shown in FIG.
  • the front plate, the circularly polarizing plate, the touch sensor, and the bonding surface of the pressure-sensitive adhesive layer were subjected to double-sided corona treatment before bonding.
  • TEC-4AX manufactured by Ushio, Inc.
  • About the pressure-sensitive adhesive layer Inclination from the origin to the maximum stress GL ', stress relaxation rate ⁇ , creep rate ⁇ , deformation restoration rate R, glass transition temperature T g , shear modulus, and static bending durability of the optical laminate 100 was measured according to the following method. The results are shown in Table 3.
  • ⁇ Layer thickness> The measurement was performed using a contact type film thickness measuring device (“MS-5C” manufactured by Nikon Corporation). The polarizer layer and the alignment film were measured using a laser microscope (“OLS3000” manufactured by Olympus Corporation).
  • ⁇ Slope from the origin to the maximum stress value GL '> The slope from the origin to the maximum stress value was measured using a dynamic mechanical analyzer (DMA, Q-800, manufactured by TA Instruments).
  • DMA dynamic mechanical analyzer
  • a test piece in which the ends of two polycarbonate (PC) bars 501 were bonded to each other via an adhesive layer was prepared.
  • the shape of the pressure-sensitive adhesive layer 502 was width ⁇ length ⁇ thickness 6 mm ⁇ 10 mm ⁇ 25 ⁇ m
  • the shape of the PC bar 501 was width ⁇ length ⁇ thickness 6 mm ⁇ 20 mm ⁇ 1 mm.
  • the adhesive area between the pressure-sensitive adhesive layer 502 and the PC bar 501 was 6 mm ⁇ 10 mm in width ⁇ length.
  • a jig was attached to a region having a length of 5 mm at both ends of the PC bar 501 of the test piece, and one jig was fixed. The other jig was placed at a temperature of 25 ° C. at 100 ⁇ m / min.
  • a stress [Pa] -strain [%] curve was created by pulling at the speed of. In the obtained stress-strain curve, the slope from the origin to the maximum stress was calculated.
  • ⁇ Creep rate ⁇ > A dynamic mechanical analyzer (DMA, Q-800, manufactured by TA Instruments) was used to measure the creep rate (Creep) of the pressure-sensitive adhesive layer.
  • the test piece is the same as the test piece used for measuring the slope from the origin to the maximum stress value.
  • the shear modulus was measured using a viscoelasticity measuring device (MCR-301, Antonio Par).
  • the pressure-sensitive adhesive sheet had a width of 20 mm and a length of 20 mm, the release film was peeled off, and a plurality of pressure-sensitive adhesive sheets were laminated so as to have a thickness of 150 ⁇ m.
  • the temperature is 1.0 Hz
  • the deformation amount is 1%
  • the temperature rise rate is 5 ° C./min in the temperature range of -20 ° C to 100 ° C.
  • the shear modulus value at 25 ° C. was confirmed.
  • FIG. 3 shows the method of the static bending durability test (mandrel bending test).
  • the optical laminate 100 was cut into 1 cm ⁇ 10 cm test pieces.
  • the optical laminate 100 was placed on the test plate 504 with the front plate 101 side facing down, and an iron rod 503 having a diameter of 5 mm was placed on the test plate 504 (FIG. 3 (A)).
  • the front plate 101 was manually folded and fixed so as to be wound around the iron rod 503 so that the front plate 101 was on the outside (FIG. 3 (B)).
  • Static bending durability based on the period during which no bubbles are generated between the polarizing plate 103 and the first pressure-sensitive adhesive layer 102 and the second pressure-sensitive adhesive layer 104, or in the first pressure-sensitive adhesive layer 102 and the second pressure-sensitive adhesive layer 104. Gender was evaluated as follows. The generation of bubbles was determined by observation under an optical microscope. A: No bubbles were generated after 48 hours. B: Bubbles were generated within 24 hours and 48 hours. C: Bubbles were generated within 24 hours.

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PCT/JP2020/039136 2019-11-20 2020-10-16 光学積層体及び表示装置 WO2021100381A1 (ja)

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