WO2020195630A1 - Laminate and image display device - Google Patents

Laminate and image display device Download PDF

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Publication number
WO2020195630A1
WO2020195630A1 PCT/JP2020/009086 JP2020009086W WO2020195630A1 WO 2020195630 A1 WO2020195630 A1 WO 2020195630A1 JP 2020009086 W JP2020009086 W JP 2020009086W WO 2020195630 A1 WO2020195630 A1 WO 2020195630A1
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WO
WIPO (PCT)
Prior art keywords
layer
sensitive adhesive
film
adhesive layer
pressure
Prior art date
Application number
PCT/JP2020/009086
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French (fr)
Japanese (ja)
Inventor
智煕 柳
恩瑛 金
東輝 金
Original Assignee
住友化学株式会社
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Application filed by 住友化学株式会社 filed Critical 住友化学株式会社
Priority to KR1020217017187A priority Critical patent/KR102381953B1/en
Priority to CN202080021493.0A priority patent/CN113574423B/en
Publication of WO2020195630A1 publication Critical patent/WO2020195630A1/en

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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
    • G02B5/3083—Birefringent or phase retarding elements
    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/14—Protective coatings, e.g. hard coatings
    • 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
    • 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
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133528—Polarisers
    • G—PHYSICS
    • G02—OPTICS
    • 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
    • G02F1/13363—Birefringent elements, e.g. for optical compensation
    • 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
    • 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
    • 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
    • B32B2457/00—Electrical equipment
    • B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80—Constructional details
    • H10K59/8791—Arrangements for improving contrast, e.g. preventing reflection of ambient light

Definitions

  • the present invention relates to a laminate and an image display device including the laminate.
  • Patent Document 1 proposes that in an image display device having an image display panel, an adhesive layer, and a flexible film in this order, the adhesive layer is arranged at a distance from the image display panel in a bent region.
  • a laminate provided with a front plate and a circularly polarizing plate having adhesive layers on both sides is placed in a bent state in a high temperature and high humidity environment, and then when released from the bent state, it becomes a bent portion. Waviness may occur. This waviness can reduce the smoothness of the surface. When the smoothness of the surface is lowered, for example, the reflected image is distorted and the visibility is lowered.
  • An object of the present invention is to provide a bendable laminate provided with a front plate and a circularly polarizing plate having adhesive layers on both sides for a long time in a state of being bent in a high temperature and high humidity environment with the front plate side inside. It is an object of the present invention to provide a laminate having small waviness on the surface on the front plate side and having excellent visibility even after being placed, and an image display device provided with the laminate.
  • the present invention provides the following laminate and image display device.
  • a front plate and a circular polarizing plate with a double-sided pressure-sensitive adhesive layer are provided, and the thickness of the front plate is a [ ⁇ m] and the thickness of the circular polarizing plate with a double-sided pressure-sensitive adhesive layer is b [ ⁇ m].
  • a laminated body satisfying the following formula (1) when the tensile elastic modulus at a temperature of 60 ° C. and a relative humidity of 90% RH of the front plate is c [MPa].
  • the front plate side is turned inside and the laminated body is bent in a high temperature and high humidity environment for a long time. It is possible to provide a laminated body in which waviness generated on the surface on the front plate side is small and excellent in visibility at the bent portion even after the placement, and an image display device provided with the laminate.
  • FIG. 1 is a schematic cross-sectional view of a laminated body according to an embodiment of the present invention.
  • the laminate 100 shown in FIG. 1 includes a front plate 10 and a circularly polarizing plate 20 with a double-sided pressure-sensitive adhesive layer.
  • the laminated body 100 can be bent at least in the direction in which the front plate 10 is inside.
  • the term "flexible" means that the front plate 10 can be bent in the direction inward without causing cracks.
  • the thickness of the front plate 10 is a [ ⁇ m]
  • the thickness of the circularly polarizing plate 20 with a double-sided pressure-sensitive adhesive layer is b [ ⁇ m]
  • the tensile elastic modulus of the front plate 10 at a temperature of 60 ° C. and a relative humidity of 90% RH (hereinafter omitted).
  • c [MPa] sometimes referred to as “tensile elastic modulus”
  • the laminated body 100 satisfies the following formula (1).
  • the tensile elastic modulus refers to a value measured in an environment of a temperature of 60 ° C. and a relative humidity of 90% RH, unless otherwise specified. [(B / a) ⁇ c] ⁇ 2200 (1)
  • the laminate 100 When the laminate 100 satisfies the formula (1), even after being left for a long time in a state of being bent in a high temperature and high humidity environment with the front plate 10 inside, the bent portion is on the surface on the front plate 10 side. The generated swell is suppressed, and uniform visibility can be ensured.
  • the front plate 10 and the circularly polarizing plate 20 with a double-sided pressure-sensitive adhesive layer are selected so as to satisfy the above formula (1). From the viewpoint of improving the waviness of the surface, the laminated body 100 preferably satisfies the following formula (1a), and more preferably the following formula (1b).
  • the laminated body 100 preferably satisfies the following formula (1c). [(B / a) ⁇ c] ⁇ 10000 (1c)
  • a portion of a laminate provided with a front plate and a circularly polarizing plate with a double-sided pressure-sensitive adhesive layer which is bent by the present inventor in a high-temperature and high-humidity environment with the front plate inside, and then bent. It was found that undulations may occur on the surface of the front plate side, and uniform visibility may not be ensured.
  • the thickness of the front plate, the thickness of the circularly polarizing plate with the double-sided adhesive layer, and the thickness of the front plate so that the laminate provided with the front plate and the circularly polarizing plate with the double-sided pressure-sensitive adhesive layer satisfy the formula (1). It has been found that the above-mentioned waviness can be suppressed by adjusting the tensile elastic modulus.
  • the tensile modulus is measured by the method described in the column of Examples described later.
  • a and c preferably satisfy the following formula (2) from the viewpoint of suppressing waviness. a / c ⁇ 0.03 (2)
  • the laminate 100 more preferably satisfies the following formula (2a) from the viewpoint of suppressing waviness. a / c ⁇ 0.02 (2a)
  • the laminated body 100 preferably satisfies the following formula (2b) from the viewpoint of suppressing waviness. a / c ⁇ 0.009 (2b)
  • the shape of the laminated body 100 in the plane direction may be, for example, a rectangular shape, preferably a rectangular 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 laminate 100 may have corners R-processed, end portions notched, or perforated.
  • the thickness of the laminate 100 is not particularly limited because it varies depending on the function required for the laminate, the application of the laminate, etc., but is, for example, 20 ⁇ m or more and 500 ⁇ m or less, preferably 30 ⁇ m or more and 400 ⁇ m or less, and more preferably 50 ⁇ m or more and 300 ⁇ m. It is as follows.
  • the laminated body 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 laminated body 100 is suitable for a flexible display because the waviness after bending is suppressed.
  • the front plate 10 can be a plate-like body capable of transmitting light.
  • the front plate 10 may be composed of only one layer, or may be composed of two or more layers. Examples thereof include a resin plate-like body (for example, a resin plate, a resin sheet, a resin film, etc.), a glass plate-like body (for example, a glass plate, a glass film, etc.) and the like.
  • the front plate can be a layer constituting the outermost surface of the display device.
  • the thickness a [ ⁇ m] of the front plate 10 may be, for example, 10 ⁇ m or more and 100 ⁇ m or less, preferably 20 ⁇ m or more and 85 ⁇ m or less, and more preferably 30 ⁇ m or more, from the viewpoint of suppressing waviness after bending and reducing the thickness of the laminated body. It is 70 ⁇ m or less.
  • the thickness of each layer can be measured according to the thickness measuring method described in the column of Examples described later.
  • the tensile elastic modulus c [MPa] of the front plate 10 at a temperature of 60 ° C. and a relative humidity of 90% RH may be, for example, 1500 MPa or more, preferably 2000 MPa or more and 20000 MPa or less, more preferably from the viewpoint of suppressing waviness after bending. It is 2000 MPa or more and 10000 MPa or less.
  • the tensile elastic modulus is determined by, for example, selection of the material and thickness of the plate-like body constituting the front plate, selection of the composition for forming the hard coat layer for forming the hard coat layer described later, selection of the thickness of the cured product thereof, and these. The combination can be adjusted to the above range.
  • the resin plate-like body can be, for example, a resin film capable of transmitting light.
  • the thermoplastic resin constituting the resin plate such as a resin film include a chain polyolefin resin (polyethylene resin, polypropylene resin, polymethylpentene resin, etc.) and a cyclic polyolefin resin (norbornen type).
  • Polyethylene-based resins Polyethylene-based resins; Cellulosic resins such as triacetyl cellulose; Polyester-based resins such as polyethylene terephthalate, polyethylene naphthalate, and polybutylene terephthalate; Polycarbonate-based resins; Ethylene-vinyl acetate resins; Polystyrene-based resins; Polyamide Based resin; polyetherimide based resin; (meth) acrylic resin such as polymethyl (meth) acrylate resin; polyimide resin; polyether sulfone resin; polysulfone resin; polyvinyl chloride resin; polyvinylidene chloride resin; Examples thereof include polyvinyl alcohol-based resins; polyvinyl acetal-based resins; polyether ketone-based resins; polyether ether ketone-based resins; polyether sulfone-based resins; polyamideimide-based resins.
  • thermoplastic resin can be used alone or in combination of two or more.
  • the thermoplastic resin constituting the front plate is preferably a cyclic polyolefin resin, a polyimide resin, a polyamide resin, or a polyamide-imide resin from the viewpoint of flexibility, strength and transparency, and more preferably polyamide. It is an imide-based tree.
  • Specific examples of the polyamide-imide resin include the polyamide-imide film described in JP-A-2018-119141.
  • the front plate 10 can be a film in which a hard coat layer is provided on at least one surface of the base film.
  • a film made of the above resin can be used as the base film.
  • the hard coat layer may be formed on one surface of the base film or may be formed on both surfaces.
  • the hard coat layer can be formed from a cured product of a hard coat layer forming composition (hereinafter, also referred to as an HC layer forming composition) containing an active energy ray-curable resin.
  • a hard coat layer forming composition hereinafter, also referred to as an HC layer forming composition
  • 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 strength. Additives are not limited, and include inorganic fine particles, organic fine particles, or mixtures thereof.
  • the composition for forming an HC layer can be prepared according to the method described in, for example, Korean Patent Publication No. 10-2018-0127050.
  • the front plate 10 is a glass plate
  • tempered glass for a display is preferably used as the glass plate.
  • the front plate 10 having excellent mechanical strength and surface hardness can be constructed.
  • the front plate 10 not only has a function of protecting the front surface (screen) of the display device (function as a window film), but also has a touch detected by the touch sensor panel 30. It may also have a function as an operation surface to be performed, and may further have a blue light cut function, a viewing angle adjusting function, and the like.
  • the circularly polarizing plate 20 with a double-sided pressure-sensitive adhesive layer preferably includes a first pressure-sensitive adhesive layer, a linear polarizing plate, a retardation layer, and a second pressure-sensitive adhesive layer in this order.
  • the thickness of the circularly polarizing plate 20 with the double-sided pressure-sensitive adhesive layer is from the surface of the first pressure-sensitive adhesive layer opposite to the linear polarizing plate side to the side opposite to the linear polarizing plate side of the second pressure-sensitive adhesive layer. Can be the distance to the surface of.
  • a circular polarizing plate in which a linearly polarized light layer and a retardation layer are arranged so that the absorption axis of the linearly polarizing plate and the slow axis of the retardation layer are at a predetermined angle can exhibit an antireflection function.
  • the retardation layer includes a ⁇ / 4 plate
  • the angle formed by the absorption axis of the linear polarizing plate and the slow axis of the ⁇ / 4 plate can be 45 ° ⁇ 10 °.
  • the linear polarizing plate and the retardation layer may be bonded by a bonding layer described later.
  • the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer may be collectively referred to as a pressure-sensitive adhesive layer.
  • the thickness b of the circularly polarizing plate 20 with the double-sided pressure-sensitive adhesive layer may be, for example, 10 ⁇ m or more and 200 ⁇ m or less, preferably 15 ⁇ m or more and 150 ⁇ m or less, and more preferably 20 ⁇ m or more and 100 ⁇ m or less.
  • Linear polarizing plate examples include a stretched film or a stretched layer on which a dichroic dye is adsorbed, or a film containing a film coated with a composition containing a dichroic dye and a polymerizable compound and cured as a polarizer. ..
  • the dichroic dye specifically, iodine or a dichroic organic dye is used.
  • dichroic organic dyes C.I. I. Included are dichroic direct dyes made of disuazo compounds such as DIRECT RED 39 and dichroic direct dyes made of compounds such as trisazo and tetrakisazo.
  • the film to which the composition containing the dichroic dye and the polymerizable compound used as a polarizer is applied and cured includes a composition containing a dichroic dye having a liquid crystal property or a dichroic dye and a polymerizable liquid crystal.
  • a composition containing a dichroic dye having a liquid crystal property or a dichroic dye and a polymerizable liquid crystal examples thereof include a film containing a cured product of a polymerizable liquid crystal compound such as a layer obtained by applying and curing the composition containing the above.
  • a film coated with a composition containing a dichroic dye and a polymerizable compound and cured 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 linear polarizing plate may be composed of only a polarizer, or may further include a protective layer, a thermoplastic resin film, a base material, an alignment film, and a protective layer, which will be described later, in addition to the polarizer.
  • the thickness of the linear polarizing plate is, for example, 2 ⁇ m or more and 100 ⁇ m or less, preferably 10 ⁇ m or more and 60 ⁇ m or less.
  • Linear polarizing plate having a stretched film or a stretched layer as a polarizer First, a linear polarizing plate having a stretched film having a dichroic dye adsorbed as a polarizer will be described.
  • a stretched film on which a dichroic dye, which is a polarizer, is adsorbed is usually bicolorized by a step of uniaxially stretching the polyvinyl alcohol-based resin film and dyeing the polyvinyl alcohol-based resin film with the bicolor dye.
  • a polarizing element may be used as it is as a linear polarizing plate, or a linear polarizing plate having a thermoplastic resin film described later bonded to one side or both sides thereof may be used.
  • the thickness of the polarizer is preferably 2 ⁇ m or more and 40 ⁇ m or less.
  • 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 acids, olefins, vinyl ethers, unsaturated sulfonic acids, and (meth) acrylamides having an ammonium group.
  • the degree of saponification of the polyvinyl alcohol-based resin is usually 85 to 100 mol%, preferably 98 mol% or more.
  • the polyvinyl alcohol-based resin may be modified, and for example, polyvinyl formal or polyvinyl acetal 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 stretched layer on which the bicolor dye, which is a polarizer, 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 one.
  • a step of dyeing a polyvinyl alcohol-based resin layer of a stretched laminated film with a dichroic dye to adsorb the dichroic dye to form a polarizer, and a film on which the dichroic dye is adsorbed is a boric acid aqueous solution.
  • the base film may be peeled off from the polarizer.
  • 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 or the polarizer which is the stretched layer may be incorporated into the laminate in the form in which a thermoplastic resin film is bonded to one side or both sides thereof.
  • This thermoplastic resin film can function as a protective film for a polarizer or a retardation film.
  • the thermoplastic resin film is, for example, a polyolefin resin such as a chain polyolefin resin (polypropylene resin, etc.), a cyclic polyolefin resin (norbornen resin, etc.); a cellulose resin such as triacetyl cellulose; polyethylene terephthalate, polyethylene na.
  • a film made of a polyester resin such as phthalate or polybutylene terephthalate; a polycarbonate resin; a (meth) acrylic resin; or a mixture thereof can be used.
  • the thickness of the thermoplastic resin film is usually 300 ⁇ m or less, preferably 200 ⁇ m or less, more preferably 100 ⁇ m or less, still more preferably 80 ⁇ m or less, still more preferably 60 ⁇ m or less. Yes, it is usually 5 ⁇ m or more, preferably 20 ⁇ m or more.
  • the thermoplastic resin film may or may not have a phase difference.
  • the thermoplastic resin film can be attached to the polarizer using, for example, an adhesive layer.
  • a linear polarizing plate having a film coated with a composition containing a dichroic dye and a polymerizable compound and cured as a polarizer A film coated with a composition containing a dichroic dye and a polymerizable compound and cured.
  • a linear polarizing plate provided as a polarizer will be described.
  • a film to which a composition containing a dichroic dye and a polymerizable compound used as a polarizer is applied and cured is a composition containing a dichroic dye having a liquid crystal property, or a dichroic dye and a liquid crystal compound. Examples thereof include a film obtained by applying the containing composition to a substrate and curing it.
  • the film may be used as a linear polarizing plate by peeling off the base material or together with the base material, or may be used as a linear polarizing plate in a configuration having a thermoplastic resin film on one side or both sides thereof.
  • the base material may be a thermoplastic resin film.
  • the example and thickness of the base material may be the same as those exemplified in the above description of the thermoplastic resin film.
  • the substrate may be a thermoplastic resin film having a hard coat layer, an antireflection layer, or an antistatic layer on at least one surface.
  • the base material may have a hard coat layer, an antireflection layer, an antistatic layer, or the like formed only on the surface on the side where the polarizer is not formed.
  • the hard coat layer, the antireflection layer, the antistatic layer and the like may be formed only on the surface on the side where the polarizer is formed.
  • the example of the hard coat layer is the same as the example of the composition for forming the HC layer in the above description of the front plate.
  • thermoplastic resin film examples include the same one as the linear polarizing plate provided with the stretched film or the stretched layer as a polarizer.
  • the thermoplastic resin film can be attached to the polarizer using, for example, an adhesive layer.
  • the film to which the composition containing the dichroic dye and the polymerizable compound is applied and cured is thin, but if it is too thin, the strength is lowered and the processability tends to be inferior.
  • the thickness of the film is usually 20 ⁇ m or less, preferably 5 ⁇ m or less, and more preferably 0.5 ⁇ m or more and 3 ⁇ m or less.
  • the film to which the composition containing the dichroic dye and the polymerizable compound is applied and cured include those described in JP2013-37353A and JP2013-33249. ..
  • the alignment film can be arranged between the base material and a composition containing a dichroic dye having a liquid crystal property, or a layer of a cured product of the composition containing the dichroic dye and a liquid crystal compound.
  • the alignment film has an orientation regulating force that aligns the liquid crystal layer formed on the liquid crystal layer in a desired direction.
  • Examples of the alignment film include an orientation polymer layer formed of an alignment polymer, a photo-alignment polymer layer formed of a photo-alignment polymer, and a grub alignment film having an uneven pattern or a plurality of grubs (grooves) on the layer surface. Can be done.
  • the thickness of the alignment film may be, for example, 10 nm or more and 500 nm or less, and preferably 10 nm or more and 200 nm or less.
  • the oriented polymer layer can be formed by applying a composition in which the oriented polymer is dissolved in a solvent to a base material to remove the solvent, and if necessary, rubbing treatment.
  • the orientation regulating force can be arbitrarily adjusted in the orientation polymer layer formed of the orientation polymer depending on the surface condition of the orientation polymer and the rubbing conditions.
  • the photo-oriented polymer layer can be formed by applying a composition containing a polymer or monomer having a photoreactive group and a solvent to the base material layer and irradiating it with polarized light.
  • the orientation-regulating force can be arbitrarily adjusted in the photo-orientation polymer layer depending on the polarization irradiation conditions for the photo-orientation polymer.
  • the grub alignment film is active on a plate-shaped master with grooves on the surface, for example, a method of forming an uneven pattern by exposure, development, etc. through an exposure mask having a pattern-shaped slit on the surface of a photosensitive polyimide film.
  • the protective layer can be used to protect the surface of the polarizer.
  • the protective layer can be arranged on the opposite side of the polarizer from the thermoplastic resin film.
  • the protective layer may be formed from the resin film exemplified as the material of the above-mentioned thermoplastic resin film, or may be a coating type protective layer.
  • the coating type protective layer may be formed by applying a cationic curable composition such as an epoxy resin or a radical curable composition such as (meth) acrylate and curing it, and may be an aqueous solution of a polyvinyl alcohol-based resin or the like.
  • a plasticizer an ultraviolet absorber, an infrared absorber, a colorant such as a pigment or a dye, a fluorescent whitening agent, a dispersant, a heat stabilizer, and a light stabilizer. It may contain an agent, an antioxidant, an antioxidant, a lubricant and the like.
  • the thickness of the protective layer may be, for example, 200 ⁇ m or less, preferably 0.1 ⁇ m or more and 100 ⁇ m or less.
  • the retardation layer may include one layer or two or more retardation layers.
  • the retardation layer can be a positive A layer such as a ⁇ / 4 layer or a ⁇ / 2 layer, and a positive C layer.
  • the retardation layer may be formed from the resin film exemplified as the material of the above-mentioned thermoplastic resin film, 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 and a base material.
  • the thickness of the retardation layer may be, for example, 1 ⁇ m or more and 50 ⁇ m or less.
  • the first pressure-sensitive adhesive layer is a pressure-sensitive adhesive layer included in the circularly polarizing plate 20 with a double-sided pressure-sensitive adhesive layer.
  • the first pressure-sensitive adhesive layer is arranged to bond the circularly polarizing plate 20 with the double-sided pressure-sensitive adhesive layer and the front plate 10.
  • the second pressure-sensitive adhesive layer is a pressure-sensitive adhesive layer included in the circularly polarizing plate 20 with a double-sided pressure-sensitive adhesive layer.
  • the second pressure-sensitive adhesive layer is arranged to bond the circularly polarizing plate 20 with the double-sided pressure-sensitive adhesive layer and the back plate described later.
  • the pressure-sensitive adhesive layer can be formed by using the pressure-sensitive adhesive composition.
  • the pressure-sensitive adhesive layer may have a single-layer structure or a multi-layer structure, but is preferably a single-layer structure.
  • the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer may each be composed of the same type of pressure-sensitive adhesive layer, or may be composed of different types of pressure-sensitive adhesive layers.
  • the pressure-sensitive adhesive composition may be a pressure-sensitive adhesive composition containing a resin such as (meth) acrylic, rubber, urethane, ester, silicone, or polyvinyl ether as a main component. Among them, a pressure-sensitive adhesive composition using a (meth) acrylic resin having excellent transparency, weather resistance, heat resistance and the like as a base polymer is preferable.
  • the pressure-sensitive adhesive composition may be an active energy ray-curable type or a thermosetting type.
  • Examples of the (meth) acrylic resin (base polymer) used in the pressure-sensitive adhesive composition include butyl (meth) acrylate, methyl (meth) acrylate, ethyl (meth) acrylate, and hexyl (meth) acrylate.
  • (Meta) acrylic acids such as octyl acrylate, (meth) lauryl acrylate, isooctyl (meth) acrylate, isodecyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, isobornyl (meth) acrylate.
  • a polymer or copolymer containing one or more esters as a monomer is preferably used.
  • the base polymer is copolymerized with a polar monomer.
  • the polar monomer include (meth) acrylic acid, 2-hydroxypropyl (meth) acrylate, hydroxyethyl (meth) acrylate, (meth) acrylamide, N, N-dimethylaminoethyl (meth) acrylate, and glycidyl ( Examples thereof include monomers having a carboxyl group, a hydroxyl group, an amide group, an amino group, an epoxy group and the like, such as meta) acrylate.
  • 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 divalent or higher metal ion that forms a carboxylic acid metal salt with a carboxyl group; a polyamine compound that forms an amide bond with a carboxyl group; poly.
  • Epoxy compounds and polyols that form an ester bond with a carboxyl group; polyisocyanate compounds that form an amide bond with a carboxyl group are exemplified. Of these, polyisocyanate compounds are preferable.
  • 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. It is a pressure-sensitive adhesive composition having the property of being able to adhere to an adherend such as, etc., and being cured by irradiation with active energy rays to adjust the adhesion force and the like.
  • 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. Further, 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 in the molecule.
  • examples thereof include (meth) acrylic compounds such as (meth) acryloyloxy group-containing compounds such as (meth) acrylate oligomers having two (meth) acryloyloxy groups.
  • the pressure-sensitive adhesive composition includes fine particles for imparting light scattering properties, beads (resin beads, glass beads, etc.), glass fibers, resins other than the base polymer, pressure-sensitive imparting agents, and fillers (metal powders and other inorganic powders). Etc.), antioxidants, ultraviolet absorbers, antistatic agents, dyes, pigments, colorants, antifoaming agents, corrosion inhibitors, photopolymerization initiators and other additives can be included.
  • the pressure-sensitive adhesive layer can be formed by applying, for example, an organic solvent diluent of the above-mentioned pressure-sensitive adhesive composition on a substrate and drying it.
  • the formed pressure-sensitive adhesive layer can be irradiated with active energy rays to obtain a cured product having a desired degree of curing.
  • the thickness of the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer is, for example, 0.5 ⁇ m or more and 100 ⁇ m or less, preferably 0.7 ⁇ m or more and 50 ⁇ m or less, and more preferably 1 ⁇ m or more and 30 ⁇ m or less.
  • the storage elastic modulus of the pressure-sensitive adhesive layer at 25 ° C. is preferably 0.01 MPa to 1.0 MPa, more preferably 0.02 MPa to 0.1 MPa.
  • the storage elastic modulus is measured, for example, under the following conditions.
  • a plurality of pressure-sensitive adhesive layers are laminated so as to have a thickness of 0.6 mm.
  • a cylinder (height 0.6 mm) having a diameter of 8 mm is punched out from the obtained pressure-sensitive adhesive layer, and this is used as a sample for measuring the storage elastic modulus.
  • JIS K7244-6 it can be measured by the torsional shear method using a viscoelasticity measuring device.
  • the frequency can be 1 Hz.
  • the back plate of the laminate 100 may be bonded to the laminate 100 via the second pressure-sensitive adhesive layer.
  • Examples of the back plate include a touch sensor panel, a display element such as an organic EL display element, or a combination thereof.
  • FIG. 2 shows a schematic cross-sectional view of the laminated body 200 according to another aspect.
  • the laminate 200 includes a front plate 10 and a circularly polarizing plate 20 with a double-sided pressure-sensitive adhesive layer.
  • the circularly polarizing plate 20 with a double-sided pressure-sensitive adhesive layer has a first pressure-sensitive polarizing plate 40, a linear polarizing plate 40, a bonding layer 50, a retardation layer 60, and a second pressure-sensitive adhesive layer 70 in this order.
  • the linear polarizing plate 40 has a base material 41, an alignment film 42, a polarizer 43, and a protective layer 44 in this order
  • the retardation layer 60 includes a ⁇ / 4 layer 61, a bonding layer 62, and the like. It has a positive C layer 63 in this order.
  • the bonding layers 50 and 62 are a pressure-sensitive adhesive layer or an adhesive layer, and can be formed by using a pressure-sensitive adhesive composition or an adhesive composition.
  • the bonded layer may have a single-layer structure or a multi-layer structure, but is preferably a single-layer structure.
  • the pressure-sensitive adhesive composition may be the same as that exemplified in the above description of the pressure-sensitive adhesive layer.
  • the adhesive composition may be a known adhesive composition, and examples thereof include a water-based adhesive composition such as a polyvinyl alcohol-based resin aqueous solution and a water-based two-component urethane emulsion adhesive; active energy such as ultraviolet rays. Examples thereof include an active energy ray-curable adhesive composition that is cured by irradiating with a line.
  • a water-based adhesive composition such as a polyvinyl alcohol-based resin aqueous solution and a water-based two-component urethane emulsion adhesive
  • active energy such as ultraviolet rays.
  • Examples thereof include an active energy ray-curable adhesive composition that is cured by irradiating with a line.
  • the thicknesses of the bonded layers 50 and 62 are, for example, 0.5 ⁇ m or more and 100 ⁇ m or less, preferably 0.7 ⁇ m or more and 50 ⁇ m or less, and more preferably 1 ⁇ m or more and 30 ⁇ m or less.
  • the laminate 200 can be manufactured by a method including a step of laminating the layers constituting the laminate via an adhesive layer or an adhesive layer.
  • a surface activation treatment such as a corona treatment in order to improve the adhesion. Is preferable.
  • the polarizer 43 can be formed on the base material 41 via the alignment film 42.
  • the polarizer 43 can be formed by applying a polarizing element-forming composition containing a dichroic dye and a polymerizable liquid crystal compound and curing the composition.
  • the composition for forming a polarizer preferably further contains a polymerization initiator, a leveling agent, a solvent, and may further contain a photosensitizer, a polymerization inhibitor, and the like, in addition to the above-mentioned dichroic dye and polymerizable liquid crystal compound.
  • the retardation layer 60 can be produced by applying a composition for forming a retardation layer containing a polymerizable liquid crystal compound on a base material and an alignment film if present, and polymerizing the polymerizable liquid crystal compound. ..
  • the composition for forming a retardation layer further contains a solvent and a polymerization initiator, and may further contain a photosensitizer, a polymerization inhibitor, a leveling agent and the like.
  • the base material and the alignment film may be incorporated into the retardation layer, or may not be separated from the retardation layer and become a component of the laminate.
  • the coating, drying, and polymerization of the polymerizable liquid crystal compound of the polarizer forming composition and the retardation layer forming composition can be carried out by conventionally known coating methods, drying methods, and polymerization methods.
  • the pressure-sensitive adhesive layers 30 and 70 can be prepared as a pressure-sensitive adhesive sheet.
  • the pressure-sensitive adhesive sheet is prepared by dissolving or dispersing the pressure-sensitive adhesive composition in an organic solvent such as toluene or ethyl acetate to prepare a pressure-sensitive adhesive liquid, and forming a layer of the pressure-sensitive adhesive on a release film that has been subjected to a mold release treatment. It can be produced by a method of forming it into a sheet shape and laminating another release film on the pressure-sensitive adhesive layer.
  • Each layer can be bonded by a method in which the pressure-sensitive adhesive sheet from which one release film has been peeled off is attached to one layer, then the other release film is peeled off, and the other layer is attached.
  • the laminate 200 may be manufactured by laminating a circularly polarizing plate on which the pressure-sensitive adhesive layer 30 and the pressure-sensitive adhesive layer 70 are formed and a front plate 10 or a front plate on which the pressure-sensitive adhesive layer 30 is formed.
  • 10 may be manufactured by laminating the circular polarizing plate on which the pressure-sensitive adhesive layer 70 is formed, or the front plate 10 on which the pressure-sensitive adhesive layer 30 is formed and the circularly polarizing plate are bonded together. It may then be produced by forming a pressure-sensitive adhesive layer 70.
  • the image 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, a touch panel display device, and an electroluminescence display device. .. Since the image display device of the present embodiment has a bendable laminated body, it can be suitably used for a flexible display, and particularly preferably for an organic EL display device.
  • the measurement was performed using a contact type film thickness measuring device (“MS-5C” manufactured by Nikon Corporation). However, the polarizer, the retardation layer, and the alignment film were measured using a laser microscope (LEXT, manufactured by Olympus Corporation).
  • the tensile elastic modulus was measured using a UTM (Universal Testing Machine, Autograph AG-X, Shimadzu Corporation) in accordance with JIS K7161.
  • the stretching conditions were a speed of 4 mm / min, a width of 10 mm, and a gauge distance of 50 mm under a moisture-resistant heat-resistant environment (temperature 60 ° C., humidity 90% RH).
  • PET film polyethylene terephthalate (PET) film was attached to the laminates obtained in each Example and Comparative Example via an adhesive layer provided in the laminate to obtain a test piece.
  • the PET film imitated an image display element, and its thickness was 100 ⁇ m.
  • the test piece was laser-cut and subjected to a moisture-resistant heat bending test under the following conditions, and then the swell of the bent portion was measured using an interference microscope.
  • composition for forming HC layer 1 contains 30 parts by mass of a polyfunctional acrylate (Miramer M340, manufactured by Miwon Specialy Chemical), 50 parts by mass of a propylene glycol monomethyl ether dispersion (12 nm, solid content 40%) of a nanosilica sol, and ethyl acetate. It contains 17 parts by mass, 2.7 parts by mass of a photopolymerization initiator (Irgacure-184, manufactured by Ciba Corporation), and 0.3 parts by mass of a fluorine-based additive (KY1203, manufactured by Shin-Etsu Chemical Industry Co., Ltd.).
  • a triacetyl cellulose (TAC) film (thickness 40 ⁇ m) was prepared.
  • the polymerizable liquid crystal compound is a polymerizable liquid crystal compound represented by the formula (1-6) [hereinafter, also referred to as compound (1-6)] and a polymerizable liquid crystal compound represented by the formula (1-7) [hereinafter, Also referred to as compound (1-7)].
  • dichroic pigment As the dichroic dye, the azo dye described in Examples of Japanese Patent Application Laid-Open No. 2013-101328 represented by the following formulas (2-1a), (2-1b) and (2-3a) was used.
  • composition for forming a polarizer contains 75 parts by mass of compound (1-6), 25 parts by mass of compound (1-7), and the above formulas (2-1a), (2-1b), (2) as a bicolor dye.
  • a pressure-sensitive adhesive composition for forming the pressure-sensitive adhesive layer 1 was prepared at the ratio of each component shown in Table 1 below. This pressure-sensitive adhesive composition was applied to the release-treated surface of the release-treated polyethylene terephthalate film (thickness 38 ⁇ m) using an applicator so that the thickness after drying was 25 ⁇ m. The coating layer was dried at 100 ° C. for 1 minute to obtain a film having the pressure-sensitive adhesive layer 1. Then, another polyethylene terephthalate film (thickness 38 ⁇ m) that had been released from the mold was attached onto the pressure-sensitive adhesive layer 1. Then, it was cured for 7 days under the conditions of a temperature of 23 ° C. and a relative humidity of 50% RH.
  • Adhesive layer 2 A film having the pressure-sensitive adhesive layer 2 was obtained in the same manner as the pressure-sensitive adhesive layer 1 except that the thickness after drying was set to 5 ⁇ m.
  • a pressure-sensitive adhesive composition for forming the pressure-sensitive adhesive layer 3 was prepared at the ratio of each component shown in Table 1 below. This pressure-sensitive adhesive composition was applied to the release-treated surface of the release-treated polyethylene terephthalate film (thickness 38 ⁇ m) using an applicator so that the thickness after drying was 5 ⁇ m. The coating layer was dried at 100 ° C. for 1 minute to obtain a film having the pressure-sensitive adhesive layer 3. Then, another release-treated polyethylene terephthalate film (thickness 38 ⁇ m) was laminated on the pressure-sensitive adhesive layer. Then, it was cured for 7 days under the conditions of a temperature of 23 ° C. and a relative humidity of 50% RH.
  • TAC triacetyl cellulose
  • [Base material 2] (Composition for forming HC layer 2) Dendrimer acrylate (Miramer SP1106, Miwon Speciality Chemical) having 18-functional acryloyloxy group (sometimes referred to as acrylic group) 2.0 parts by mass, urethane acrylate (Miramer PU-620D, Miwon Speciality) having 6-functional acrylic group Chemical) 10.0 parts by mass, acrylate monomer having a trifunctional acrylic group (M340, Miwon Speciality Chemical) 8 parts by mass, photopolymerization initiator (Irgacure (registered trademark) 184, BASF) 2 parts by mass, And 0.1 part by mass of the leveling agent (BYK-UV3530, Big Chemie Japan Co., Ltd.) was dissolved in 70 parts by mass of methyl ethyl ketone (MEK) and mixed by stirring to obtain a composition 2 for forming a hard coat layer.
  • MEK methyl ethyl ketone
  • the HC layer forming composition 2 is applied to one surface of a cycloolefin (COP) film (thickness 13 ⁇ m), the obtained coating film is dried at a temperature of 80 ° C. for 5 minutes, and a UV irradiation device (SPOT CURE SP) is applied.
  • the HC layer 2 was formed by irradiating UV light with an exposure amount of 500 mJ / cm 2 (365 nm standard) using -7, manufactured by Ushio Denki Co., Ltd. The coating was applied so that the thickness after curing was 2 ⁇ m. As described above, the base material 2 was obtained.
  • a composition for forming a horizontal alignment film is obtained by mixing 5 parts (weight average molecular weight: 30,000) of a photooriented material having the following structure and 95 parts of cyclopentanone, and stirring the obtained mixture at 80 ° C. for 1 hour. I got something.
  • NMP N-methyl-2-pyrrolidone
  • the polymerizable liquid crystal compound A was produced by the method described in JP-A-2010-31223. Further, the polymerizable liquid crystal compound B was produced according to the method described in JP-A-2009-173893. The molecular structure of each is shown below.
  • a base film made of a cycloolefin polymer (COP) film (manufactured by Nippon Zeon Co., Ltd., ZF-14, thickness 23 ⁇ m) was produced using a corona treatment device (AGF-B10, manufactured by Kasuga Electric Works Ltd.) at an output of 0.3 kW. Corona treatment was performed once under the condition of a treatment speed of 3 m / min. The composition for forming a horizontal alignment film was applied to the surface of the corona-treated substrate by a bar coater. The coating film was dried at 80 ° C.
  • COP cycloolefin polymer
  • polarized UV exposure was performed using a polarized UV irradiator (SPOT CURE SP-7; manufactured by Ushio, Inc.) with an integrated light intensity of 100 mJ / cm 2 .
  • SPOT CURE SP-7 polarized UV irradiator
  • the thickness of the obtained horizontal alignment film was measured with a laser microscope (LEXT, manufactured by Olympus Corporation) and found to be 100 nm.
  • the composition for forming a retardation layer (1) was passed through a PTFE membrane filter (manufactured by Advantech Toyo Co., Ltd., product number; T300A025A) having a pore size of 0.2 ⁇ m in an environment of room temperature of 25 ° C. and humidity of 30% RH. It was applied using a bar coater on a base film with an alignment film kept at 25 ° C. After the coating film is dried at 120 ° C.
  • a PTFE membrane filter manufactured by Advantech Toyo Co., Ltd., product number; T300A025A
  • phase difference layer 1 a layer ( ⁇ / 4 layer) in which the polymerizable liquid crystal compound was cured, a horizontally aligned film, and a base film were laminated in this order (phase difference layer 1).
  • the retardation layer 1 showed anti-wavelength dispersibility.
  • [Positive C layer] As a composition for forming a vertically oriented film, 2-phenoxyethyl acrylate, tetrahydrofurfuryl acrylate, dipentaerythritol triacrylate, and bis (2-vinyloxyethyl) ether are mixed in a ratio of 1: 1: 4: 5. A mixture was mixed and LUCIRIN TPO was added as a polymerization initiator at a ratio of 4%.
  • the retardation layer forming composition (2) was prepared by preparing a photopolymerizable nematic liquid crystal compound (manufactured by Merck & Co., Inc., RMM28B) and a solvent so that the solid content was 1 to 1.5 g.
  • a solvent a mixed solvent in which methyl ethyl ketone (MEK), methyl isobutyl ketone (MIBK), and cyclohexanone (CHN) were mixed at a mass ratio (MEK: MIBK: CHN) of 35:30:35 was used. ..
  • a polyethylene terephthalate (PET) film having a thickness of 38 ⁇ m was prepared as a base film.
  • a composition for forming a vertical alignment film was applied to one side of the base film so as to have a thickness of 3 ⁇ m, and an ultraviolet ray of 200 mJ / cm 2 was irradiated to prepare a vertical alignment film.
  • the composition for forming a retardation layer (2) was coated on the vertically oriented layer by die coating.
  • the coating amount was 4 to 5 g (wet).
  • the coating film was dried at a drying temperature of 75 ° C. and a drying time of 120 seconds. Then, the coating film was irradiated with ultraviolet rays (UV) to polymerize the polymerizable liquid crystal compound.
  • UV ultraviolet rays
  • the thickness of the obtained coating film was measured with a laser microscope (Lext, manufactured by Olympus Corporation) and found to be 1 ⁇ m.
  • phase difference layer 2 a layer in which the polymerizable liquid crystal compound was cured (positive C layer), a vertically oriented film, and a base film were laminated in this order (phase difference layer 2).
  • the total thickness of the retardation layer 2 was 4 ⁇ m, which was the cured layer of the polymerizable liquid crystal compound and the alignment film.
  • the base material 1 was prepared.
  • the composition for forming an alignment film was applied onto the base material 1 by the bar coating method.
  • the coating was dried at 80 ° C. for 1 minute.
  • the coating film was irradiated with polarized UV to impart orientation performance to the coating film.
  • the exposure amount was 100 mJ / cm 2 (based on 365 nm).
  • UIS-27132 ## manufactured by Ushio, Inc.
  • the thickness of the alignment film was 100 nm.
  • the above-mentioned composition for forming a polarizer was applied onto the formed alignment film by a bar coating method.
  • the coating film was heated and dried at 100 ° C. for 2 minutes and then cooled to room temperature.
  • a polarizer was formed by irradiating the coating film with ultraviolet rays at an integrated light amount of 1200 mJ / cm 2 (365 nm standard) using the above UV irradiation device.
  • the thickness of the obtained polarizer was 3 ⁇ m.
  • a composition containing polyvinyl alcohol and water was applied onto the polarizer so that the thickness after drying was 0.5 ⁇ m, and dried at a temperature of 80 ° C. for 3 minutes to form a protective layer. In this way, a linear polarizing plate having a structure of base material 1 / alignment film / polarizer / protective layer was produced.
  • the surface of the pressure-sensitive adhesive layer 1 exposed by peeling off the other polyethylene terephthalate film from the pressure-sensitive adhesive layer 1 and the surface of the linear polarizing plate on the base material 1 side are subjected to corona treatment, and then the two are bonded together. It was. Then, the surface of the linear polarizing plate on the protective layer side and the surface of the pressure-sensitive adhesive layer 3 exposed by peeling off one polyethylene terephthalate film of the film provided with the pressure-sensitive adhesive layer 3 are subjected to corona treatment, and then both are subjected to corona treatment. I pasted them together. Next, the other polyethylene terephthalate film was peeled off from the pressure-sensitive adhesive layer 3 to expose the pressure-sensitive adhesive layer 3. In this way, a laminate having the composition of front plate 1 / pressure-sensitive adhesive layer 1 / base material 1 / alignment film / polarizer / protective layer / pressure-sensitive adhesive layer 3 was obtained.
  • the base film used for forming the retardation layer 1 was peeled off from the retardation layer described above.
  • the exposed ⁇ / 4 layer and the pressure-sensitive adhesive layer 3 were bonded together.
  • the angle formed by the absorption axis of the polarizer and the slow axis of the ⁇ / 4 layer was 45 °.
  • the base film used for forming the retardation layer 2 was peeled off to expose the positive C layer.
  • a film provided with another pressure-sensitive adhesive layer 1 was prepared, and one of the polyethylene terephthalate films was peeled off to expose the surface of the pressure-sensitive adhesive layer 1. After corona treatment was applied to the surface of the exposed positive C layer and the surface of the pressure-sensitive adhesive layer 1, both were bonded together.
  • Example 1 the front plate 1 / adhesive layer 1 / base material 1 / alignment film / polarizer / protective layer / adhesive layer 3 / ( ⁇ / 4 layer) / adhesive layer 3 / positive C layer / adhesive
  • Example 2 the circular polarizing plate with the double-sided pressure-sensitive adhesive layer is the pressure-sensitive adhesive layer 1 / base material 1 / alignment film / polarizer / protective layer / pressure-sensitive adhesive layer 3 / ( ⁇ / 4 layer) / pressure-sensitive adhesive layer 3 /. It consists of a positive C layer / adhesive layer 1.
  • Example 2 A laminate of Example 2 was obtained in the same manner as in Example 1 except that the front plate 2 was used instead of the front plate 1 in Example 1. The results are shown in Table 2.
  • Example 3 A laminate of Example 3 was obtained in the same manner as in Example 1 except that the front plate 3 was used instead of the front plate 1 in Example 1. The results are shown in Table 2.
  • Example 4 In Example 1, instead of preparing the base material 1 and applying the alignment film forming composition on the base material 1, the base material 2 is prepared and the alignment film is formed on the HC layer 2 of the base material 2. Lamination of Example 4 in the same manner as in Example 1 except that the composition for use was applied and the film provided with the pressure-sensitive adhesive layer 2 was used instead of the film provided with the pressure-sensitive adhesive layer 1. I got a body. The results are shown in Table 2.
  • Comparative example 1 A laminate of Comparative Example 1 was produced in the same manner as in Example 4 except that the front plate 4 was used instead of the front plate 1 in Example 4. The results are shown in Table 2.

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Abstract

The purpose of this invention is to provide: a flexible laminate comprising a front surface sheet and a circular polarizing plate with an adhesive layer on both sides thereof, wherein even if left for a long period of time in a flexed state under a high temperature, high humidity environment with the front surface sheet on the inside, the waves which occur on the surface on the front surface sheet side in the bent portion is small, providing a laminate with excellent visibility; and an image display device equipped with said laminate. This invention provides a laminate comprising a front surface sheet and a circular polarizing plate with adhesive layer on both sides, wherein if the thickness of the front surface sheet is defined as a [µm], the thickness of the circular polarizing plate with adhesive layer on both sides is defined as b [µm], and the moisture and heat-resistant modulus of elasticity at a front surface sheet temperature of 60°C and a relative humidity of 90%RH is defined as c[MPa], the condition [(b/a)×c]≥2200 is satisfied.

Description

積層体及び画像表示装置Laminated body and image display device
　本発明は、積層体、及びそれを含む画像表示装置に関する。 The present invention relates to a laminate and an image display device including the laminate.
　特許文献１には、画像表示パネル、粘着層及びフレキシブルフィルムをこの順に有する画像表示装置において、粘着層が屈曲領域において画像表示パネルから離隔して配置されることが提案されている。 Patent Document 1 proposes that in an image display device having an image display panel, an adhesive layer, and a flexible film in this order, the adhesive layer is arranged at a distance from the image display panel in a bent region.
韓国公開特許１０－２０１６－００６９５６０Korean Published Patent 10-2016-0069560
　前面板と、両面に粘着剤層を有する円偏光板とを備える積層体は、屈曲した状態で高温高湿環境下に置かれた後、屈曲した状態から解放されたときに、折り曲げた部分にうねりが生じることがある。このうねりは、表面の平滑性を低下させることがある。表面の平滑性が低下すると、例えば反射像が歪んでしまい、視認性が低下する。本発明の目的は、前面板と、両面に粘着剤層を有する円偏光板とを備える屈曲可能な積層体において、前面板側を内側にして高温高湿環境下で屈曲させた状態で長時間置いた後でも、折り曲げた部分において、前面板側の表面に生じるうねりが小さく、視認性に優れた積層体、及びそれを備えた画像表示装置を提供することである。 A laminate provided with a front plate and a circularly polarizing plate having adhesive layers on both sides is placed in a bent state in a high temperature and high humidity environment, and then when released from the bent state, it becomes a bent portion. Waviness may occur. This waviness can reduce the smoothness of the surface. When the smoothness of the surface is lowered, for example, the reflected image is distorted and the visibility is lowered. An object of the present invention is to provide a bendable laminate provided with a front plate and a circularly polarizing plate having adhesive layers on both sides for a long time in a state of being bent in a high temperature and high humidity environment with the front plate side inside. It is an object of the present invention to provide a laminate having small waviness on the surface on the front plate side and having excellent visibility even after being placed, and an image display device provided with the laminate.
　本発明は、以下の積層体及び画像表示装置を提供する。
［１］　前面板と、両面粘着剤層付円偏光板とを備え、前記前面板の厚みをａ[μｍ]とし、前記両面粘着剤層付円偏光板の厚みをｂ[μｍ]とし、前記前面板の温度６０℃及び相対湿度９０％ＲＨでの引張弾性率をｃ［ＭＰａ］としたとき、下記式（１）を満たす、積層体。
　［（ｂ／ａ）×ｃ］≧２２００　　　　　（１）
［２］　前記ａ及び前記ｃは、下記式（２）を満たす、［１］に記載の積層体。
　ａ／ｃ≦０．０３　　　　　　　　　　　（２）
［３］　前記前面板はハードコート層を有する、［１］又は［２］に記載の積層体。
［４］　前記両面粘着剤層付円偏光板は、第１粘着剤層と、直線偏光板と、位相差層と、第２粘着剤層とをこの順に有する、［１］～［３］のいずれかに記載の積層体。
［５］　前記直線偏光板は、ハードコート層を少なくとも一方の表面に有する熱可塑性樹脂フィルムを含む、［４］に記載の積層体。
［６］　［１］～［５］のいずれかに記載の積層体を備える、画像表示装置。 The present invention provides the following laminate and image display device.
[1] A front plate and a circular polarizing plate with a double-sided pressure-sensitive adhesive layer are provided, and the thickness of the front plate is a [μm] and the thickness of the circular polarizing plate with a double-sided pressure-sensitive adhesive layer is b [μm]. A laminated body satisfying the following formula (1) when the tensile elastic modulus at a temperature of 60 ° C. and a relative humidity of 90% RH of the front plate is c [MPa].
[(B / a) × c] ≧ 2200 (1)
[2] The laminate according to [1], wherein the a and c satisfy the following formula (2).
a / c ≤ 0.03 (2)
[3] The laminate according to [1] or [2], wherein the front plate has a hard coat layer.
[4] The circularly polarizing plate with a double-sided pressure-sensitive adhesive layer has a first pressure-sensitive adhesive layer, a linear polarizing plate, a retardation layer, and a second pressure-sensitive adhesive layer in this order, according to [1] to [3]. The laminate according to any one.
[5] The laminate according to [4], wherein the linear polarizing plate includes a thermoplastic resin film having a hard coat layer on at least one surface.
[6] An image display device comprising the laminate according to any one of [1] to [5].
　本発明によれば、前面板と、両面に粘着剤層を有する円偏光板とを備える屈曲可能な積層体において、前面板側を内側にして高温高湿環境下で屈曲させた状態で長時間置いた後でも、折り曲げた部分において、前面板側の表面に生じるうねりが小さく、視認性に優れた積層体、及びそれを備えた画像表示装置を提供することができる。 According to the present invention, in a bendable laminate provided with a front plate and a circularly polarizing plate having adhesive layers on both sides, the front plate side is turned inside and the laminated body is bent in a high temperature and high humidity environment for a long time. It is possible to provide a laminated body in which waviness generated on the surface on the front plate side is small and excellent in visibility at the bent portion even after the placement, and an image display device provided with the laminate.
本発明の一態様に係る積層体を示す概略断面図である。It is a schematic sectional drawing which shows the laminated body which concerns on one aspect of this invention. 本発明の一態様に係る積層体を示す概略断面図である。It is a schematic sectional drawing which shows the laminated body which concerns on one aspect of this invention.
　以下、図面を参照しつつ本発明の実施形態を説明するが、本発明は以下の実施形態に限定されるものではない。以下の全ての図面においては、各構成要素を理解し易くするために縮尺を適宜調整して示しており、図面に示される各構成要素の縮尺と実際の構成要素の縮尺とは必ずしも一致しない。 Hereinafter, embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited to the following embodiments. In all the drawings below, the scales are appropriately adjusted to make it easier to understand each component, and the scale of each component shown in the drawings does not necessarily match the scale of the actual component.
　＜積層体＞
　図１は、本発明の一実施形態による積層体の概略断面図である。図１に示す積層体１００は、前面板１０と、両面粘着剤層付円偏光板２０とを備える。 <Laminated body>
FIG. 1 is a schematic cross-sectional view of a laminated body according to an embodiment of the present invention. The laminate 100 shown in FIG. 1 includes a front plate 10 and a circularly polarizing plate 20 with a double-sided pressure-sensitive adhesive layer.
　積層体１００は、少なくとも前面板１０を内側にした方向に屈曲可能である。屈曲可能とは、前面板１０を内側にした方向にクラックを生じさせることなく屈曲させ得ることを意味する。 The laminated body 100 can be bent at least in the direction in which the front plate 10 is inside. The term "flexible" means that the front plate 10 can be bent in the direction inward without causing cracks.
　前面板１０の厚みをａ［μｍ］、両面粘着剤層付円偏光板２０の厚みをｂ［μｍ］、前面板１０の温度６０℃及び相対湿度９０％ＲＨでの引張弾性率（以下、省略して「引張弾性率」ということもある）をｃ［ＭＰａ］とするとき、積層体１００は、下記式（１）を満たす。本明細書において、引張弾性率は、特に断りがない限り、温度６０℃及び相対湿度９０％ＲＨの環境で測定した値を指す。
　［（ｂ／ａ）×ｃ］≧２２００　　　　　（１） The thickness of the front plate 10 is a [μm], the thickness of the circularly polarizing plate 20 with a double-sided pressure-sensitive adhesive layer is b [μm], and the tensile elastic modulus of the front plate 10 at a temperature of 60 ° C. and a relative humidity of 90% RH (hereinafter omitted). When c [MPa] is set (sometimes referred to as “tensile elastic modulus”), the laminated body 100 satisfies the following formula (1). In the present specification, the tensile elastic modulus refers to a value measured in an environment of a temperature of 60 ° C. and a relative humidity of 90% RH, unless otherwise specified.
[(B / a) × c] ≧ 2200 (1)
　積層体１００が式（１）を満たすことにより、前面板１０を内側にして高温高湿環境下で屈曲させた状態で長時間置いた後でも、折り曲げた部分において、前面板１０側の表面に生じるうねりが抑制され、均一な視認性を確保することができる。前面板１０及び両面粘着剤層付円偏光板２０は、上記式（１）を満たすように選択される。積層体１００は、表面のうねりを改善させる観点から、下記式（１ａ）を満たすことが好ましく、下記式（１ｂ）を満たすことがより好ましい。
　［（ｂ／ａ）×ｃ］≧３０００　　　　　（１ａ）
　［（ｂ／ａ）×ｃ］≧４０００　　　　　（１ｂ）
　また、積層体１００は、下記式（１ｃ）を満たすことが好ましい。
　［（ｂ／ａ）×ｃ］≦１００００　　　　（１ｃ） When the laminate 100 satisfies the formula (1), even after being left for a long time in a state of being bent in a high temperature and high humidity environment with the front plate 10 inside, the bent portion is on the surface on the front plate 10 side. The generated swell is suppressed, and uniform visibility can be ensured. The front plate 10 and the circularly polarizing plate 20 with a double-sided pressure-sensitive adhesive layer are selected so as to satisfy the above formula (1). From the viewpoint of improving the waviness of the surface, the laminated body 100 preferably satisfies the following formula (1a), and more preferably the following formula (1b).
[(B / a) × c] ≧ 3000 (1a)
[(B / a) × c] ≧ 4000 (1b)
Further, the laminated body 100 preferably satisfies the following formula (1c).
[(B / a) × c] ≦ 10000 (1c)
　本発明者によって、前面板と、両面粘着剤層付円偏光板とを備える積層体を、前面板を内側にして高温高湿環境下で屈曲させた状態で長時間置いた後、折り曲げた部分の前面板側の表面にうねりが発生し、均一な視認性を確保することができない場合があることが分かった。研究の結果、前面板と、両面粘着剤層付円偏光板とを備える積層体が式（１）を満たすように前面板の厚み、両面粘着剤層付円偏光板の厚み、及び前面板の引張弾性率を調整することにより、上記うねりを抑制できることを見出した。 A portion of a laminate provided with a front plate and a circularly polarizing plate with a double-sided pressure-sensitive adhesive layer, which is bent by the present inventor in a high-temperature and high-humidity environment with the front plate inside, and then bent. It was found that undulations may occur on the surface of the front plate side, and uniform visibility may not be ensured. As a result of the research, the thickness of the front plate, the thickness of the circularly polarizing plate with the double-sided adhesive layer, and the thickness of the front plate so that the laminate provided with the front plate and the circularly polarizing plate with the double-sided pressure-sensitive adhesive layer satisfy the formula (1). It has been found that the above-mentioned waviness can be suppressed by adjusting the tensile elastic modulus.
　本明細書において、引張弾性率は、後述の実施例の欄に記載の方法によって測定される。 In the present specification, the tensile modulus is measured by the method described in the column of Examples described later.
　積層体１００は、うねり抑制の観点から好ましくはａ及びｃが下記式（２）を満たす。
　ａ／ｃ≦０．０３　　　　　　　　　　（２） In the laminated body 100, a and c preferably satisfy the following formula (2) from the viewpoint of suppressing waviness.
a / c ≤ 0.03 (2)
　積層体１００は、うねり抑制の観点からより好ましくは下記式（２ａ）を満たす。
　ａ／ｃ≦０．０２　　　　　　　　　　（２ａ） The laminate 100 more preferably satisfies the following formula (2a) from the viewpoint of suppressing waviness.
a / c ≤ 0.02 (2a)
　積層体１００は、うねり抑制の観点から好ましくは下記式（２ｂ）を満たす。
　ａ／ｃ≧０．００９　　　　　　　　　（２ｂ） The laminated body 100 preferably satisfies the following formula (2b) from the viewpoint of suppressing waviness.
a / c ≧ 0.009 (2b)
　積層体１００の面方向の形状は、例えば方形形状であってよく、好ましくは長辺と短辺とを有する方形形状であり、より好ましくは長方形である。積層体１００の面方向の形状が長方形である場合、長辺の長さは、例えば１０ｍｍ以上１４００ｍｍ以下であってよく、好ましくは５０ｍｍ以上６００ｍｍ以下である。短辺の長さは、例えば５ｍｍ以上８００ｍｍ以下であり、好ましくは３０ｍｍ以上５００ｍｍ以下であり、より好ましくは５０ｍｍ以上３００ｍｍ以下である。積層体１００を構成する各層は、角部がＲ加工されたり、端部が切り欠き加工されたり、穴あき加工されたりしていてもよい。 The shape of the laminated body 100 in the plane direction may be, for example, a rectangular shape, preferably a rectangular shape having a long side and a short side, and more preferably a rectangle. When the shape of the laminated body 100 in the surface direction is rectangular, 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 laminate 100 may have corners R-processed, end portions notched, or perforated.
　積層体１００の厚みは、積層体に求められる機能及び積層体の用途等に応じて異なるため特に限定されないが、例えば２０μｍ以上５００μｍ以下であり、好ましくは３０μｍ以上４００μｍ以下、より好ましくは５０μｍ以上３００μｍ以下である。 The thickness of the laminate 100 is not particularly limited because it varies depending on the function required for the laminate, the application of the laminate, etc., but is, for example, 20 μm or more and 500 μm or less, preferably 30 μm or more and 400 μm or less, and more preferably 50 μm or more and 300 μm. It is as follows.
　積層体１００は、例えば表示装置等に用いることができる。表示装置は特に限定されず、例えば有機エレクトロルミネッセンス（有機ＥＬ）表示装置、無機エレクトロルミネッセンス（無機ＥＬ）表示装置、液晶表示装置、電界発光表示装置等が挙げられる。積層体１００は、屈曲させた後のうねりが抑制されるため、フレキシブルディスプレイに好適である。 The laminated body 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 laminated body 100 is suitable for a flexible display because the waviness after bending is suppressed.
　［前面板］
　前面板１０は、光を透過可能な板状体であることができる。前面板１０は、１層のみから構成されてよく、２層以上から構成されてもよい。その例としては、樹脂製の板状体（例えば樹脂板、樹脂シート、樹脂フィルム等）、ガラス製の板状体（例えばガラス板、ガラスフィルム等）等が挙げられる。前面板は、表示装置の最表面を構成する層であることができる。 [Front plate]
The front plate 10 can be a plate-like body capable of transmitting light. The front plate 10 may be composed of only one layer, or may be composed of two or more layers. Examples thereof include a resin plate-like body (for example, a resin plate, a resin sheet, a resin film, etc.), a glass plate-like body (for example, a glass plate, a glass film, etc.) and the like. The front plate can be a layer constituting the outermost surface of the display device.
　前面板１０の厚みａ［μｍ］は、屈曲後のうねり抑制及び積層体の薄型化の観点から、例えば１０μｍ以上１００μｍ以下であってよく、好ましくは２０μｍ以上８５μｍ以下であり、より好ましくは３０μｍ以上７０μｍ以下である。本発明において、各層の厚みは、後述する実施例の欄において説明する厚み測定方法にしたがって測定することができる。 The thickness a [μm] of the front plate 10 may be, for example, 10 μm or more and 100 μm or less, preferably 20 μm or more and 85 μm or less, and more preferably 30 μm or more, from the viewpoint of suppressing waviness after bending and reducing the thickness of the laminated body. It is 70 μm or less. In the present invention, the thickness of each layer can be measured according to the thickness measuring method described in the column of Examples described later.
　前面板１０の温度６０℃及び相対湿度９０％ＲＨでの引張弾性率ｃ［ＭＰａ］は、例えば１５００ＭＰａ以上であってよく、屈曲後のうねり抑制の観点から好ましくは２０００ＭＰａ以上２００００ＭＰａ以下、より好ましくは２０００ＭＰａ以上１００００ＭＰａ以下である。引張弾性率は、例えば前面板を構成する板状体の材料や厚みの選択、後述のハードコート層を形成するハードコート層形成用組成物の組成やその硬化物の厚みの選択、及びこれらの組合せにより上述の範囲に調節されることができる。 The tensile elastic modulus c [MPa] of the front plate 10 at a temperature of 60 ° C. and a relative humidity of 90% RH may be, for example, 1500 MPa or more, preferably 2000 MPa or more and 20000 MPa or less, more preferably from the viewpoint of suppressing waviness after bending. It is 2000 MPa or more and 10000 MPa or less. The tensile elastic modulus is determined by, for example, selection of the material and thickness of the plate-like body constituting the front plate, selection of the composition for forming the hard coat layer for forming the hard coat layer described later, selection of the thickness of the cured product thereof, and these. The combination can be adjusted to the above range.
　前面板１０が樹脂製の板状体である場合、樹脂製の板状体は、例えば光を透過可能な樹脂フィルムであることができる。樹脂フィルム等の樹脂製の板状体を構成する熱可塑性樹脂としては、例えば、鎖状ポリオレフィン系樹脂（ポリエチレン系樹脂、ポリプロピレン系樹脂、ポリメチルペンテン系樹脂等）、環状ポリオレフィン系樹脂（ノルボルネン系樹脂等）等のポリオレフィン系樹脂；トリアセチルセルロース等のセルロース系樹脂；ポリエチレンテレフタレート、ポリエチレンナフタレート、ポリブチレンテレフタレート等のポリエステル系樹脂；ポリカーボネート系樹脂；エチレン－酢酸ビニル系樹脂；ポリスチレン系樹脂；ポリアミド系樹脂；ポリエーテルイミド系樹脂；ポリメチル（メタ）アクリレート樹脂等の（メタ）アクリル系樹脂；ポリイミド系樹脂；ポリエーテルスルホン系樹脂；ポリスルホン系樹脂；ポリ塩化ビニル系樹脂；ポリ塩化ビニリデン系樹脂；ポリビニルアルコール系樹脂；ポリビニルアセタール系樹脂；ポリエーテルケトン系樹脂；ポリエーテルエーテルケトン系樹脂；ポリエーテルスルホン系樹脂；ポリアミドイミド系樹脂等が挙げられる。熱可塑性樹脂は、単独で又は２種以上混合して用いることができる。
　中でも、前面板を構成する熱可塑性樹脂としては、可撓性、強度及び透明性の観点から好ましくは環状ポリオレフィン系樹脂、ポリイミド系樹脂、ポリアミド系樹脂、ポリアミドイミド系樹脂であり、より好ましくはポリアミドイミド系樹である。ポリアミドイミド系樹脂の具体例としては、特開２０１８－１１９１４１号公報に記載のポリアミドイミドフィルム等が挙げられる。 When the front plate 10 is a resin plate-like body, the resin plate-like body can be, for example, a resin film capable of transmitting light. Examples of the thermoplastic resin constituting the resin plate such as a resin film include a chain polyolefin resin (polyethylene resin, polypropylene resin, polymethylpentene resin, etc.) and a cyclic polyolefin resin (norbornen type). Resins, etc.) Polyethylene-based resins; Cellulosic resins such as triacetyl cellulose; Polyester-based resins such as polyethylene terephthalate, polyethylene naphthalate, and polybutylene terephthalate; Polycarbonate-based resins; Ethylene-vinyl acetate resins; Polystyrene-based resins; Polyamide Based resin; polyetherimide based resin; (meth) acrylic resin such as polymethyl (meth) acrylate resin; polyimide resin; polyether sulfone resin; polysulfone resin; polyvinyl chloride resin; polyvinylidene chloride resin; Examples thereof include polyvinyl alcohol-based resins; polyvinyl acetal-based resins; polyether ketone-based resins; polyether ether ketone-based resins; polyether sulfone-based resins; polyamideimide-based resins. The thermoplastic resin can be used alone or in combination of two or more.
Among them, the thermoplastic resin constituting the front plate is preferably a cyclic polyolefin resin, a polyimide resin, a polyamide resin, or a polyamide-imide resin from the viewpoint of flexibility, strength and transparency, and more preferably polyamide. It is an imide-based tree. Specific examples of the polyamide-imide resin include the polyamide-imide film described in JP-A-2018-119141.
　前面板１０は、基材フィルムの少なくとも一方の面にハードコート層が設けられたフィルムであることができる。基材フィルムとしては、上記樹脂からできたフィルムを用いることができる。ハードコート層は、基材フィルムの一方の面に形成されていてもよいし、両方の面に形成されていてもよい。ハードコート層を設けることにより、硬度およびスクラッチ性を向上させた樹脂フィルムとすることができる。 The front plate 10 can be a film in which a hard coat layer is provided on at least one surface of the base film. As the base film, a film made of the above resin can be used. The hard coat layer may be formed on one surface of the base film or may be formed on both surfaces. By providing the hard coat layer, a resin film having improved hardness and scratchability can be obtained.
　ハードコート層は、活性エネルギー線硬化型樹脂を含むハードコート層形成用組成物（以下、ＨＣ層形成用組成物ともいう）の硬化物から形成することができる。紫外線硬化型樹脂としては、例えばアクリル系樹脂、シリコーン系樹脂、ポリエステル系樹脂、ウレタン系樹脂、アミド系樹脂、エポキシ系樹脂等が挙げられる。ハードコート層は、強度を向上させるために、添加剤を含んでいてもよい。添加剤は限定されることはなく、無機系微粒子、有機系微粒子、またはこれらの混合物が挙げられる。ＨＣ層形成用組成物は、例えば韓国公開特許１０－２０１８－０１２７０５０等に記載の方法に従って調製することができる。 The hard coat layer can be formed from a cured product of a hard coat layer forming composition (hereinafter, also referred to as an HC layer forming composition) containing an active energy ray-curable resin. Examples of 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 strength. Additives are not limited, and include inorganic fine particles, organic fine particles, or mixtures thereof. The composition for forming an HC layer can be prepared according to the method described in, for example, Korean Patent Publication No. 10-2018-0127050.
　前面板１０がガラス板である場合、ガラス板は、ディスプレイ用強化ガラスが好ましく用いられる。ガラス板を用いることにより、優れた機械的強度および表面硬度を有する前面板１０を構成することができる。 When the front plate 10 is a glass plate, tempered glass for a display is preferably used as the glass plate. By using the glass plate, the front plate 10 having excellent mechanical strength and surface hardness can be constructed.
　積層体１００が表示装置に用いられる場合、前面板１０は、表示装置の前面（画面）を保護する機能（ウィンドウフィルムとしての機能）を有するのみではなく、タッチセンサパネル３０で検知されるタッチを行う操作面としての機能も有するものであってもよく、さらに、ブルーライトカット機能、視野角調整機能等を有するものであってもよい。 When the laminate 100 is used in a display device, the front plate 10 not only has a function of protecting the front surface (screen) of the display device (function as a window film), but also has a touch detected by the touch sensor panel 30. It may also have a function as an operation surface to be performed, and may further have a blue light cut function, a viewing angle adjusting function, and the like.
　［両面粘着剤層付円偏光板］
　両面粘着剤層付円偏光板２０は、第１粘着剤層と、直線偏光板と、位相差層と、第２粘着剤層とをこの順に含むことが好ましい。この実施形態において、両面粘着剤層付円偏光板２０の厚みは、第１粘着剤層における直線偏光板側とは反対側の表面から、第２粘着剤層における直線偏光板側とは反対側の表面までの距離であることができる。直線偏光板の吸収軸と位相差層の遅相軸とが所定の角度となるように直線偏光層と位相差層とが配置された円偏光板は、反射防止機能を発揮することができる。位相差層がλ／４板を含む場合、直線偏光板の吸収軸とλ／４板の遅相軸とのなす角度は、４５°±１０°であることができる。直線偏光板と、位相差層とは後述の貼合層により貼合されていてよい。以下、第１粘着剤層及び第２粘着剤層を総称して粘着剤層ともいうことがある。 [Circular polarizing plate with double-sided adhesive layer]
The circularly polarizing plate 20 with a double-sided pressure-sensitive adhesive layer preferably includes a first pressure-sensitive adhesive layer, a linear polarizing plate, a retardation layer, and a second pressure-sensitive adhesive layer in this order. In this embodiment, the thickness of the circularly polarizing plate 20 with the double-sided pressure-sensitive adhesive layer is from the surface of the first pressure-sensitive adhesive layer opposite to the linear polarizing plate side to the side opposite to the linear polarizing plate side of the second pressure-sensitive adhesive layer. Can be the distance to the surface of. A circular polarizing plate in which a linearly polarized light layer and a retardation layer are arranged so that the absorption axis of the linearly polarizing plate and the slow axis of the retardation layer are at a predetermined angle can exhibit an antireflection function. When the retardation layer includes a λ / 4 plate, the angle formed by the absorption axis of the linear polarizing plate and the slow axis of the λ / 4 plate can be 45 ° ± 10 °. The linear polarizing plate and the retardation layer may be bonded by a bonding layer described later. Hereinafter, the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer may be collectively referred to as a pressure-sensitive adhesive layer.
　両面粘着剤層付円偏光板２０の厚みｂは、例えば１０μｍ以上２００μｍ以下であってよく、好ましくは１５μｍ以上１５０μｍ以下、より好ましくは２０μｍ以上１００μｍ以下である。 The thickness b of the circularly polarizing plate 20 with the double-sided pressure-sensitive adhesive layer may be, for example, 10 μm or more and 200 μm or less, preferably 15 μm or more and 150 μm or less, and more preferably 20 μm or more and 100 μm or less.
　（直線偏光板）
　直線偏光板としては、二色性色素を吸着させた延伸フィルム若しくは延伸層、又は二色性色素および重合性化合物を含む組成物を塗布し硬化させたフィルムを偏光子として含むフィルム等が挙げられる。二色性色素として、具体的には、ヨウ素や二色性の有機染料が用いられる。二色性有機染料には、Ｃ．Ｉ．ＤＩＲＥＣＴ　ＲＥＤ　３９等のジスアゾ化合物からなる二色性直接染料、トリスアゾ、テトラキスアゾなどの化合物からなる二色性直接染料が包含される。 (Linear polarizing plate)
Examples of the linear polarizing plate include a stretched film or a stretched layer on which a dichroic dye is adsorbed, or a film containing a film coated with a composition containing a dichroic dye and a polymerizable compound and cured as a polarizer. .. As the dichroic dye, specifically, iodine or a dichroic organic dye is used. For dichroic organic dyes, C.I. I. Included are dichroic direct dyes made of disuazo compounds such as DIRECT RED 39 and dichroic direct dyes made of compounds such as trisazo and tetrakisazo.
　偏光子として用いられる、二色性色素および重合性化合物を含む組成物を塗布し硬化させたフィルムとしては、液晶性を有する二色性色素を含む組成物又は二色性色素と重合性液晶とを含む組成物を塗布し硬化させて得られる層等の重合性液晶化合物の硬化物を含むフィルム等が挙げられる。二色性色素および重合性化合物を含む組成物を塗布し硬化させたフィルムは、二色性色素を吸着させた延伸フィルム、又は延伸層に比べて、屈曲方向に制限がないため好ましい。 The film to which the composition containing the dichroic dye and the polymerizable compound used as a polarizer is applied and cured includes a composition containing a dichroic dye having a liquid crystal property or a dichroic dye and a polymerizable liquid crystal. Examples thereof include a film containing a cured product of a polymerizable liquid crystal compound such as a layer obtained by applying and curing the composition containing the above. A film coated with a composition containing a dichroic dye and a polymerizable compound and cured 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.
　直線偏光板は、偏光子のみから構成されてもよいし、偏光子に加えて、後述の保護層、熱可塑性樹脂フィルム、基材、配向膜、保護層をさらに含んでいてもよい。直線偏光板の厚みは、例えば２μｍ以上１００μｍ以下であり、好ましくは１０μｍ以上６０μｍ以下である。 The linear polarizing plate may be composed of only a polarizer, or may further include a protective layer, a thermoplastic resin film, a base material, an alignment film, and a protective layer, which will be described later, in addition to the polarizer. The thickness of the linear polarizing plate is, for example, 2 μm or more and 100 μm or less, preferably 10 μm or more and 60 μm or less.
　（１）延伸フィルム又は延伸層を偏光子として備える直線偏光板
　まず、二色性色素を吸着させた延伸フィルムを偏光子として備える直線偏光板について説明する。偏光子である、二色性色素を吸着させた延伸フィルムは、通常、ポリビニルアルコール系樹脂フィルムを一軸延伸する工程、ポリビニルアルコール系樹脂フィルムを二色性色素で染色することにより、その二色性色素を吸着させる工程、及び二色性色素が吸着されたポリビニルアルコール系樹脂フィルムをホウ酸水溶液で処理する工程を有する、及びホウ酸水溶液による処理後に水洗する工程を経て製造することができる。かかる偏光子をそのまま直線偏光板として用いてもよく、その片面又は両面に後述する熱可塑性樹脂フィルムを貼合したものを直線偏光板として用いてもよい。偏光子の厚みは、好ましくは２μｍ以上４０μｍ以下である。 (1) Linear polarizing plate having a stretched film or a stretched layer as a polarizer First, a linear polarizing plate having a stretched film having a dichroic dye adsorbed as a polarizer will be described. A stretched film on which a dichroic dye, which is a polarizer, is adsorbed is usually bicolorized by a step of uniaxially stretching the polyvinyl alcohol-based resin film and dyeing the polyvinyl alcohol-based resin film with the bicolor dye. It can be produced through a step of adsorbing a dye, a step of treating a polyvinyl alcohol-based resin film on which a 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. Such a polarizing element may be used as it is as a linear polarizing plate, or a linear polarizing plate having a thermoplastic resin film described later bonded to one side or both sides thereof may be used. The thickness of the polarizer is preferably 2 μm or more and 40 μm or less.
　ポリビニルアルコール系樹脂は、ポリ酢酸ビニル系樹脂をケン化することによって得られる。ポリ酢酸ビニル系樹脂としては、酢酸ビニルの単独重合体であるポリ酢酸ビニルのほか、酢酸ビニルとそれに共重合可能な他の単量体との共重合体が用いられる。酢酸ビニルに共重合可能な他の単量体としては、例えば、不飽和カルボン酸類、オレフィン類、ビニルエーテル類、不飽和スルホン酸類、アンモニウム基を有する（メタ）アクリルアミド類等が挙げられる。 The polyvinyl alcohol-based resin is obtained by saponifying the polyvinyl acetate-based resin. As 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 acids, olefins, vinyl ethers, unsaturated sulfonic acids, and (meth) acrylamides having an ammonium group.
　ポリビニルアルコール系樹脂のケン化度は、通常８５～１００モル％であり、好ましくは９８モル％以上である。ポリビニルアルコール系樹脂は変性されていてもよく、例えば、アルデヒド類で変性されたポリビニルホルマールやポリビニルアセタールも使用することができる。ポリビニルアルコール系樹脂の重合度は、通常１０００以上１００００以下であり、好ましくは１５００以上５０００以下である。 The degree of saponification of the polyvinyl alcohol-based resin is usually 85 to 100 mol%, preferably 98 mol% or more. The polyvinyl alcohol-based resin may be modified, and for example, polyvinyl formal or polyvinyl acetal 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.
　次に、二色性色素を吸着させた延伸層を偏光子として備える直線偏光板について説明する。偏光子である、二色性色素を吸着させた延伸層は、通常、上記ポリビニルアルコール系樹脂を含む塗布液を基材フィルム上に塗布する工程、得られた積層フィルムを一軸延伸する工程、一軸延伸された積層フィルムのポリビニルアルコール系樹脂層を二色性色素で染色することにより、その二色性色素を吸着させて偏光子とする工程、二色性色素が吸着されたフィルムをホウ酸水溶液で処理する工程、及びホウ酸水溶液による処理後に水洗する工程を経て製造することができる。
　必要に応じて、基材フィルムを偏光子から剥離除去してもよい。基材フィルムの材料及び厚みは、後述する熱可塑性樹脂フィルムの材料及び厚みと同様であってよい。 Next, a linear polarizing plate including a stretched layer on which a dichroic dye is adsorbed as a polarizer will be described. The stretched layer on which the bicolor dye, which is a polarizer, 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 one. A step of dyeing a polyvinyl alcohol-based resin layer of a stretched laminated film with a dichroic dye to adsorb the dichroic dye to form a polarizer, and a film on which the dichroic dye is adsorbed is a boric acid aqueous solution. It can be produced through a step of treating with water and a step of washing with water after treatment with an aqueous boric acid solution.
If necessary, the base film may be peeled off from the polarizer. The material and thickness of the base film may be the same as the material and thickness of the thermoplastic resin film described later.
　延伸フィルム又は延伸層である偏光子は、その片面又は両面に熱可塑性樹脂フィルムが貼合されている形態で積層体に組み込まれてもよい。この熱可塑性樹脂フィルムは、偏光子用の保護フィルム、又は位相差フィルムとして機能し得る。熱可塑性樹脂フィルムは、例えば、鎖状ポリオレフィン系樹脂（ポリプロピレン系樹脂など）、環状ポリオレフィン系樹脂（ノルボルネン系樹脂など）等のポリオレフィン系樹脂；トリアセチルセルロース等のセルロース系樹脂；ポリエチレンテレフタレート、ポリエチレンナフタレート、ポリブチレンテレフタレート等のポリエステル系樹脂；ポリカーボネート系樹脂；（メタ）アクリル系樹脂；又はこれらの混合物等からなるフィルムであることができる。 The stretched film or the polarizer which is the stretched layer may be incorporated into the laminate in the form in which a thermoplastic resin film is bonded to one side or both sides thereof. This thermoplastic resin film can function as a protective film for a polarizer or a retardation film. The thermoplastic resin film is, for example, a polyolefin resin such as a chain polyolefin resin (polypropylene resin, etc.), a cyclic polyolefin resin (norbornen resin, etc.); a cellulose resin such as triacetyl cellulose; polyethylene terephthalate, polyethylene na. A film made of a polyester resin such as phthalate or polybutylene terephthalate; a polycarbonate resin; a (meth) acrylic resin; or a mixture thereof can be used.
　熱可塑性樹脂フィルムの厚みは、薄型化の観点から、通常３００μｍ以下であり、好ましくは２００μｍ以下であり、より好ましくは１００μｍ以下であり、さらに好ましくは８０μｍ以下であり、なおさらに好ましくは６０μｍ以下であり、また、通常５μｍ以上であり、好ましくは２０μｍ以上である。熱可塑性樹脂フィルムは位相差を有していても、有していなくてもよい。熱可塑性樹脂フィルムは、例えば、接着剤層を用いて偏光子に貼合することができる。 From the viewpoint of thinning, the thickness of the thermoplastic resin film is usually 300 μm or less, preferably 200 μm or less, more preferably 100 μm or less, still more preferably 80 μm or less, still more preferably 60 μm or less. Yes, it is usually 5 μm or more, preferably 20 μm or more. The thermoplastic resin film may or may not have a phase difference. The thermoplastic resin film can be attached to the polarizer using, for example, an adhesive layer.
　（２）二色性色素および重合性化合物を含む組成物を塗布し硬化させたフィルムを偏光子として備える直線偏光板
　二色性色素および重合性化合物を含む組成物を塗布し硬化させたフィルムを偏光子として備える直線偏光板について説明する。偏光子として用いられる、二色性色素および重合性化合物を含む組成物を塗布し硬化させたフィルムは、液晶性を有する二色性色素を含む組成物、又は二色性色素と液晶化合物とを含む組成物を基材に塗布し硬化して得られるフィルム等が挙げられる。当該フィルムは、基材を剥離してまたは基材とともに直線偏光板として用いてもよく、またはその片面又は両面に熱可塑性樹脂フィルムを有する構成で直線偏光板として用いてもよい。 (2) A linear polarizing plate having a film coated with a composition containing a dichroic dye and a polymerizable compound and cured as a polarizer A film coated with a composition containing a dichroic dye and a polymerizable compound and cured. A linear polarizing plate provided as a polarizer will be described. A film to which a composition containing a dichroic dye and a polymerizable compound used as a polarizer is applied and cured is a composition containing a dichroic dye having a liquid crystal property, or a dichroic dye and a liquid crystal compound. Examples thereof include a film obtained by applying the containing composition to a substrate and curing it. The film may be used as a linear polarizing plate by peeling off the base material or together with the base material, or may be used as a linear polarizing plate in a configuration having a thermoplastic resin film on one side or both sides thereof.
　基材は熱可塑性樹脂フィルムであってよい。基材の例及び厚みは、上述の熱可塑性樹脂フィルムの説明において例示したものと同一であってよい。基材は、ハードコート層、反射防止層、又は帯電防止層を少なくとも一方の表面に有する熱可塑性樹脂フィルムであってもよい。基材は、偏光子が形成されない側の表面のみに、ハードコート層、反射防止層、帯電防止層等が形成されていてもよい。基材は、ハードコート層、反射防止層、帯電防止層等が、偏光子が形成されている側の表面のみに形成されていてもよい。ハードコート層の例は、上述の前面板の説明におけるＨＣ層形成用組成物の例示と同一である。 The base material may be a thermoplastic resin film. The example and thickness of the base material may be the same as those exemplified in the above description of the thermoplastic resin film. The substrate may be a thermoplastic resin film having a hard coat layer, an antireflection layer, or an antistatic layer on at least one surface. The base material may have a hard coat layer, an antireflection layer, an antistatic layer, or the like formed only on the surface on the side where the polarizer is not formed. As the base material, the hard coat layer, the antireflection layer, the antistatic layer and the like may be formed only on the surface on the side where the polarizer is formed. The example of the hard coat layer is the same as the example of the composition for forming the HC layer in the above description of the front plate.
　熱可塑性樹脂フィルムとしては、上記延伸フィルム又は延伸層を偏光子として備える直線偏光板と同一のものが挙げられる。熱可塑性樹脂フィルムは、例えば、接着剤層を用いて偏光子に貼合することができる。 Examples of the thermoplastic resin film include the same one as the linear polarizing plate provided with the stretched film or the stretched layer as a polarizer. The thermoplastic resin film can be attached to the polarizer using, for example, an adhesive layer.
　二色性色素および重合性化合物を含む組成物を塗布し硬化させたフィルムは薄い方が好ましいが、薄すぎると強度が低下し、加工性に劣る傾向がある。当該フィルムの厚みは、通常２０μｍ以下であり、好ましくは５μｍ以下であり、より好ましくは０．５μｍ以上３μｍ以下である。 It is preferable that the film to which the composition containing the dichroic dye and the polymerizable compound is applied and cured is thin, but if it is too thin, the strength is lowered and the processability tends to be inferior. The thickness of the film is usually 20 μm or less, preferably 5 μm or less, and more preferably 0.5 μm or more and 3 μm or less.
　二色性色素および重合性化合物を含む組成物を塗布し硬化させたフィルムとしては、具体的には、特開２０１３－３７３５３号公報や特開２０１３－３３２４９号公報等に記載のものが挙げられる。 Specific examples of the film to which the composition containing the dichroic dye and the polymerizable compound is applied and cured include those described in JP2013-37353A and JP2013-33249. ..
　（配向膜）
　配向膜は、上記基材と液晶性を有する二色性色素を含む組成物、又は二色性色素と液晶化合物とを含む組成物の硬化物の層との間に配置されることができる。配向膜は、その上に形成される液晶層を所望の方向に液晶配向させる、配向規制力を有する。配向膜としては、配向性ポリマーで形成された配向性ポリマー層、光配向ポリマーで形成された光配向性ポリマー層、層表面に凹凸パターンや複数のグルブ（溝）を有するグルブ配向膜を挙げることができる。配向膜の厚みは、例えば１０ｎｍ以上５００ｎｍ以下であってよく、１０ｎｍ以上２００ｎｍ以下であることが好ましい。 (Alignment film)
The alignment film can be arranged between the base material and a composition containing a dichroic dye having a liquid crystal property, or a layer of a cured product of the composition containing the dichroic dye and a liquid crystal compound. The alignment film has an orientation regulating force that aligns the liquid crystal layer formed on the liquid crystal layer in a desired direction. Examples of the alignment film include an orientation polymer layer formed of an alignment polymer, a photo-alignment polymer layer formed of a photo-alignment polymer, and a grub alignment film having an uneven pattern or a plurality of grubs (grooves) on the layer surface. Can be done. The thickness of the alignment film may be, for example, 10 nm or more and 500 nm or less, and preferably 10 nm or more and 200 nm or less.
　配向性ポリマー層は、配向性ポリマーを溶剤に溶解した組成物を基材に塗布して溶剤を除去し、必要に応じてラビング処理をして形成することができる。この場合、配向規制力は、配向性ポリマーで形成された配向性ポリマー層では、配向性ポリマーの表面状態やラビング条件によって任意に調整することが可能である。 The oriented polymer layer can be formed by applying a composition in which the oriented polymer is dissolved in a solvent to a base material to remove the solvent, and if necessary, rubbing treatment. In this case, the orientation regulating force can be arbitrarily adjusted in the orientation polymer layer formed of the orientation polymer depending on the surface condition of the orientation polymer and the rubbing conditions.
　光配向性ポリマー層は、光反応性基を有するポリマー又はモノマーと溶剤とを含む組成物を基材層に塗布し、偏光を照射することによって形成することができる。この場合、配向規制力は、光配向性ポリマー層では、光配向性ポリマーに対する偏光照射条件等によって任意に調整することが可能である。 The photo-oriented polymer layer can be formed by applying a composition containing a polymer or monomer having a photoreactive group and a solvent to the base material layer and irradiating it with polarized light. In this case, the orientation-regulating force can be arbitrarily adjusted in the photo-orientation polymer layer depending on the polarization irradiation conditions for the photo-orientation polymer.
　グルブ配向膜は、例えば感光性ポリイミド膜表面にパターン形状のスリットを有する露光用マスクを介して露光、現像等を行って凹凸パターンを形成する方法、表面に溝を有する板状の原盤に、活性エネルギー線硬化性樹脂の未硬化の層を形成し、この層を基材に転写して硬化する方法、基材に活性エネルギー線硬化性樹脂の未硬化の層を形成し、この層に、凹凸を有するロール状の原盤を押し当てる等により凹凸を形成して硬化させる方法等によって形成することができる。 The grub alignment film is active on a plate-shaped master with grooves on the surface, for example, a method of forming an uneven pattern by exposure, development, etc. through an exposure mask having a pattern-shaped slit on the surface of a photosensitive polyimide film. A method of forming an uncured layer of an energy ray-curable resin, transferring this layer to a substrate and curing it, forming an uncured layer of an active energy ray-curable resin on the substrate, and making this layer uneven. It can be formed by a method of forming irregularities and hardening by pressing a roll-shaped master having the above.
　（保護層）
　保護層は、偏光子の表面を保護するために用いることができる。直線偏光板が熱可塑性樹脂フィルムを含む場合、保護層は、偏光子の熱可塑性樹脂フィルムとは反対側に配置されることができる。保護層としては、上記の熱可塑性樹脂フィルムの材料として例示をした樹脂フィルムから形成されてもよいし、コーティング型の保護層であってもよい。コーティング型の保護層は、例えばエポキシ樹脂等のカチオン硬化性組成物や（メタ）アクリレート等のラジカル硬化性組成物を塗布し、硬化してなるものであってよく、ポリビニルアルコール系樹脂等の水溶液を塗布し、乾燥してなるものであってよく、必要により可塑剤、紫外線吸収剤、赤外線吸収剤、顔料や染料のような着色剤、蛍光増白剤、分散剤、熱安定剤、光安定剤、帯電防止剤、酸化防止剤、滑剤等を含んでいてもよい。 (Protective layer)
The protective layer can be used to protect the surface of the polarizer. When the linear polarizing plate contains a thermoplastic resin film, the protective layer can be arranged on the opposite side of the polarizer from the thermoplastic resin film. The protective layer may be formed from the resin film exemplified as the material of the above-mentioned thermoplastic resin film, or may be a coating type protective layer. The coating type protective layer may be formed by applying a cationic curable composition such as an epoxy resin or a radical curable composition such as (meth) acrylate and curing it, and may be an aqueous solution of a polyvinyl alcohol-based resin or the like. It may be coated and dried, and if necessary, a plasticizer, an ultraviolet absorber, an infrared absorber, a colorant such as a pigment or a dye, a fluorescent whitening agent, a dispersant, a heat stabilizer, and a light stabilizer. It may contain an agent, an antioxidant, an antioxidant, a lubricant and the like.
　保護層の厚みは、例えば２００μｍ以下であってよく、好ましくは０．１μｍ以上１００μｍ以下である。 The thickness of the protective layer may be, for example, 200 μm or less, preferably 0.1 μm or more and 100 μm or less.
　（位相差層）
　位相差層は、１層または２層以上の位相差層を含むことができる。位相差層としては、λ／４層やλ／２層のようなポジティブＡ層、およびポジティブＣ層であることができる。位相差層は、上述の熱可塑性樹脂フィルムの材料として例示をした樹脂フィルムから形成されてもよいし、重合性液晶化合物が硬化した層から形成されてもよい。位相差層は、さらに配向膜や基材を含んでいてもよい。位相差層の厚みは、例えば１μｍ以上５０μｍ以下であってよい。 (Phase difference layer)
The retardation layer may include one layer or two or more retardation layers. The retardation layer can be a positive A layer such as a λ / 4 layer or a λ / 2 layer, and a positive C layer. The retardation layer may be formed from the resin film exemplified as the material of the above-mentioned thermoplastic resin film, 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 and a base material. The thickness of the retardation layer may be, for example, 1 μm or more and 50 μm or less.
　（粘着剤層）
　第１粘着剤層は、両面粘着剤層付円偏光板２０が有する粘着剤層である。第１粘着剤層は、両面粘着剤層付円偏光板２０と、前面板１０とを貼合するために配置される。第２粘着剤層は、両面粘着剤層付円偏光板２０が有する粘着剤層である。第２粘着剤層は、両面粘着剤層付円偏光板２０と、後述する背面板とを貼合するために配置される。粘着剤層は、粘着剤組成物を用いて形成することができる。粘着剤層は、単層構造であっても多層構造であってもよいが、好ましくは単層構造である。第１粘着剤層及び第２粘着剤層はそれぞれ、同種の粘着剤層から構成されてよく、又は異種の粘着剤層から構成されてもよい。 (Adhesive layer)
The first pressure-sensitive adhesive layer is a pressure-sensitive adhesive layer included in the circularly polarizing plate 20 with a double-sided pressure-sensitive adhesive layer. The first pressure-sensitive adhesive layer is arranged to bond the circularly polarizing plate 20 with the double-sided pressure-sensitive adhesive layer and the front plate 10. The second pressure-sensitive adhesive layer is a pressure-sensitive adhesive layer included in the circularly polarizing plate 20 with a double-sided pressure-sensitive adhesive layer. The second pressure-sensitive adhesive layer is arranged to bond the circularly polarizing plate 20 with the double-sided pressure-sensitive adhesive layer and the back plate described later. The pressure-sensitive adhesive layer can be formed by using the pressure-sensitive adhesive composition. The pressure-sensitive adhesive layer may have a single-layer structure or a multi-layer structure, but is preferably a single-layer structure. The first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer may each be composed of the same type of pressure-sensitive adhesive layer, or may be composed of different types of pressure-sensitive adhesive layers.
　粘着剤組成物は、（メタ）アクリル系、ゴム系、ウレタン系、エステル系、シリコーン系、ポリビニルエーテル系のような樹脂を主成分とする粘着剤組成物であってよい。中でも、透明性、耐候性、耐熱性等に優れる（メタ）アクリル系樹脂をベースポリマーとする粘着剤組成物が好適である。粘着剤組成物は、活性エネルギー線硬化型、熱硬化型であってもよい。 The pressure-sensitive adhesive composition may be a pressure-sensitive adhesive composition containing a resin such as (meth) acrylic, rubber, urethane, ester, silicone, or polyvinyl ether as a main component. Among them, a pressure-sensitive adhesive composition using a (meth) acrylic resin having excellent transparency, weather resistance, heat resistance and the like as a base polymer is preferable. The pressure-sensitive adhesive composition may be an active energy ray-curable type or a thermosetting type.
　粘着剤組成物に用いられる（メタ）アクリル系樹脂（ベースポリマー）としては、例えば（メタ）アクリル酸ブチル、（メタ）アクリル酸メチル、（メタ）アクリル酸エチル、（メタ）アクリル酸ヘキシル、（メタ）アクリル酸オクチル、（メタ）アクリル酸ラウリル、（メタ）アクリル酸イソオクチル、（メタ）アクリル酸イソデシル、（メタ）アクリル酸２－エチルヘキシル、（メタ）アクリル酸イソボルニルのような（メタ）アクリル酸エステルの１種又は２種以上をモノマーとする重合体又は共重合体が好適に用いられる。 Examples of the (meth) acrylic resin (base polymer) used in the pressure-sensitive adhesive composition include butyl (meth) acrylate, methyl (meth) acrylate, ethyl (meth) acrylate, and hexyl (meth) acrylate. (Meta) acrylic acids such as octyl acrylate, (meth) lauryl acrylate, isooctyl (meth) acrylate, isodecyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, isobornyl (meth) acrylate. A polymer or copolymer containing one or more esters as a monomer is preferably used.
　ベースポリマーには、極性モノマーを共重合させることが好ましい。極性モノマーとしては、例えば、（メタ）アクリル酸、（メタ）アクリル酸２－ヒドロキシプロピル、（メタ）アクリル酸ヒドロキシエチル、（メタ）アクリルアミド、Ｎ，Ｎ－ジメチルアミノエチル（メタ）アクリレート、グリシジル（メタ）アクリレートのような、カルボキシル基、水酸基、アミド基、アミノ基、エポキシ基等を有するモノマーを挙げることができる。 It is preferable that the base polymer is copolymerized with a polar monomer. Examples of the polar monomer include (meth) acrylic acid, 2-hydroxypropyl (meth) acrylate, hydroxyethyl (meth) acrylate, (meth) acrylamide, N, N-dimethylaminoethyl (meth) acrylate, and glycidyl ( Examples thereof include monomers having a carboxyl group, a hydroxyl group, an amide group, an amino group, an epoxy group and the like, such as meta) acrylate.
　粘着剤組成物は、上記ベースポリマーのみを含むものであってもよいが、通常は架橋剤をさらに含有する。架橋剤としては、２価以上の金属イオンであって、カルボキシル基との間でカルボン酸金属塩を形成するもの；ポリアミン化合物であって、カルボキシル基との間でアミド結合を形成するもの；ポリエポキシ化合物やポリオールであって、カルボキシル基との間でエステル結合を形成するもの；ポリイソシアネート化合物であって、カルボキシル基との間でアミド結合を形成するものが例示される。中でも、ポリイソシアネート化合物が好ましい。 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 divalent or higher metal ion that forms a carboxylic acid metal salt with a carboxyl group; a polyamine compound that forms an amide bond with a carboxyl group; poly. Epoxy compounds and polyols that form an ester bond with a carboxyl group; polyisocyanate compounds that form an amide bond with a carboxyl group are exemplified. Of these, polyisocyanate compounds are preferable.
　活性エネルギー線硬化型粘着剤組成物とは、紫外線や電子線のような活性エネルギー線の照射を受けて硬化する性質を有しており、活性エネルギー線照射前においても粘着性を有してフィルム等の被着体に密着させることができ、活性エネルギー線の照射によって硬化して密着力等の調整ができる性質を有する粘着剤組成物である。 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. It is a pressure-sensitive adhesive composition having the property of being able to adhere to an adherend such as, etc., and being cured by irradiation with active energy rays to adjust the adhesion force and the like.
　活性エネルギー線硬化型粘着剤組成物は、紫外線硬化型であることが好ましい。活性エネルギー線硬化型粘着剤組成物は、ベースポリマー、架橋剤に加えて、活性エネルギー線重合性化合物をさらに含有する。さらに必要に応じて、光重合開始剤や光増感剤等を含有させてもよい。 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. Further, if necessary, a photopolymerization initiator, a photosensitizer, or the like may be contained.
　活性エネルギー線重合性化合物としては、例えば、分子内に少なくとも１個の（メタ）アクリロイルオキシ基を有する（メタ）アクリレートモノマー；官能基含有化合物を２種以上反応させて得られ、分子内に少なくとも２個の（メタ）アクリロイルオキシ基を有する（メタ）アクリレートオリゴマー等の（メタ）アクリロイルオキシ基含有化合物等の（メタ）アクリル系化合物が挙げられる。 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 in the molecule. Examples thereof include (meth) acrylic compounds such as (meth) acryloyloxy group-containing compounds such as (meth) acrylate oligomers having two (meth) acryloyloxy groups.
　粘着剤組成物は、光散乱性を付与するための微粒子、ビーズ（樹脂ビーズ、ガラスビーズ等）、ガラス繊維、ベースポリマー以外の樹脂、粘着性付与剤、充填剤（金属粉やその他の無機粉末等）、酸化防止剤、紫外線吸収剤、帯電防止剤、染料、顔料、着色剤、消泡剤、腐食防止剤、光重合開始剤等の添加剤を含むことができる。 The pressure-sensitive adhesive composition includes fine particles for imparting light scattering properties, beads (resin beads, glass beads, etc.), glass fibers, resins other than the base polymer, pressure-sensitive imparting agents, and fillers (metal powders and other inorganic powders). Etc.), antioxidants, ultraviolet absorbers, antistatic agents, dyes, pigments, colorants, antifoaming agents, corrosion inhibitors, photopolymerization initiators and other additives can be included.
　粘着剤層は、上記粘着剤組成物の例えば有機溶剤希釈液を基材上に塗布し、乾燥させることにより形成することができる。活性エネルギー線硬化型粘着剤組成物を用いた場合は、形成された粘着剤層に、活性エネルギー線を照射することにより所望の硬化度を有する硬化物とすることができる。 The pressure-sensitive adhesive layer can be formed by applying, for example, an organic solvent diluent of the above-mentioned pressure-sensitive adhesive composition on a substrate and drying it. When the active energy ray-curable pressure-sensitive adhesive composition is used, the formed pressure-sensitive adhesive layer can be irradiated with active energy rays to obtain a cured product having a desired degree of curing.
　第１粘着剤層及び第２粘着剤層の厚みはそれぞれ、例えば０．５μｍ以上１００μｍ以下であり、好ましくは０．７μｍ以上５０μｍ以下であり、より好ましくは１μｍ以上３０μｍ以下である。 The thickness of the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer is, for example, 0.5 μm or more and 100 μm or less, preferably 0.7 μm or more and 50 μm or less, and more preferably 1 μm or more and 30 μm or less.
　粘着剤層の２５℃における貯蔵弾性率は、０．０１ＭＰａ～１．０ＭＰａであることが好ましく、０．０２ＭＰａ～０．１ＭＰａであることがより好ましい。貯蔵弾性率は、例えば以下の条件で測定される。粘着剤層を厚さ０．６ｍｍになるように複数積層する。得られた粘着剤層から、直径８ｍｍの円柱体（高さ０．６ｍｍ）を打ち抜き、これを貯蔵弾性率の測定用サンプルとする。ＪＩＳ　Ｋ７２４４－６に準拠し、粘弾性測定装置を用いてねじりせん断法により測定することができる。周波数は１Ｈｚとすることができる。 The storage elastic modulus of the pressure-sensitive adhesive layer at 25 ° C. is preferably 0.01 MPa to 1.0 MPa, more preferably 0.02 MPa to 0.1 MPa. The storage elastic modulus is measured, for example, under the following conditions. A plurality of pressure-sensitive adhesive layers are laminated so as to have a thickness of 0.6 mm. A cylinder (height 0.6 mm) having a diameter of 8 mm is punched out from the obtained pressure-sensitive adhesive layer, and this is used as a sample for measuring the storage elastic modulus. According to JIS K7244-6, it can be measured by the torsional shear method using a viscoelasticity measuring device. The frequency can be 1 Hz.
　［その他の構成要素］
　積層体１００は、第２粘着剤層を介して、背面板が貼合されていてもよい。背面板としては、タッチセンサパネル、有機ＥＬ表示素子等の表示素子又はこれらの組合せ等が挙げられる。 [Other components]
The back plate of the laminate 100 may be bonded to the laminate 100 via the second pressure-sensitive adhesive layer. Examples of the back plate include a touch sensor panel, a display element such as an organic EL display element, or a combination thereof.
　図２は、別の一態様に係る積層体２００の概略断面図を示す。積層体２００は、前面板１０と、両面粘着剤層付円偏光板２０とを備える。両面粘着剤層付円偏光板２０は、第１粘着剤層３０と、直線偏光板４０と、貼合層５０と、位相差層６０と、第２粘着剤層７０とをこの順に有し、直線偏光板４０は、基材４１と、配向膜４２と、偏光子４３と、保護層４４とをこの順に有し、位相差層６０は、λ／４層６１と、貼合層６２と、ポジティブＣ層６３とをこの順に有する。 FIG. 2 shows a schematic cross-sectional view of the laminated body 200 according to another aspect. The laminate 200 includes a front plate 10 and a circularly polarizing plate 20 with a double-sided pressure-sensitive adhesive layer. The circularly polarizing plate 20 with a double-sided pressure-sensitive adhesive layer has a first pressure-sensitive polarizing plate 40, a linear polarizing plate 40, a bonding layer 50, a retardation layer 60, and a second pressure-sensitive adhesive layer 70 in this order. The linear polarizing plate 40 has a base material 41, an alignment film 42, a polarizer 43, and a protective layer 44 in this order, and the retardation layer 60 includes a λ / 4 layer 61, a bonding layer 62, and the like. It has a positive C layer 63 in this order.
　（貼合層）
　貼合層５０及び６２は粘着剤層又は接着剤層であり、粘着剤組成物や接着剤組成物を用いて形成することができる。貼合層は、単層構造であっても多層構造であってもよいが、好ましくは単層構造である。粘着剤組成物としては、上述の粘着剤層の説明において例示したものと同一であってよい。 (Lated layer)
The bonding layers 50 and 62 are a pressure-sensitive adhesive layer or an adhesive layer, and can be formed by using a pressure-sensitive adhesive composition or an adhesive composition. The bonded layer may have a single-layer structure or a multi-layer structure, but is preferably a single-layer structure. The pressure-sensitive adhesive composition may be the same as that exemplified in the above description of the pressure-sensitive adhesive layer.
　接着剤組成物としては、公知の接着剤組成物であってよく、その例としてはポリビニルアルコール系樹脂水溶液、水系二液型ウレタン系エマルジョン接着剤等の水系接着剤組成物；紫外線等の活性エネルギー線を照射することによって硬化する活性エネルギー線硬化型接着剤組成物等を挙げることができる。 The adhesive composition may be a known adhesive composition, and examples thereof include a water-based adhesive composition such as a polyvinyl alcohol-based resin aqueous solution and a water-based two-component urethane emulsion adhesive; active energy such as ultraviolet rays. Examples thereof include an active energy ray-curable adhesive composition that is cured by irradiating with a line.
　貼合層５０及び６２の厚みは、例えば０．５μｍ以上１００μｍ以下であり、好ましくは０．７μｍ以上５０μｍ以下であり、より好ましくは１μｍ以上３０μｍ以下である。 The thicknesses of the bonded layers 50 and 62 are, for example, 0.5 μm or more and 100 μm or less, preferably 0.7 μm or more and 50 μm or less, and more preferably 1 μm or more and 30 μm or less.
　積層体２００は、粘着剤層や接着剤層を介して積層体を構成する層同士を貼合する工程を含む方法によって製造することができる。粘着剤層や接着剤層を介して層同士を貼合する場合には、密着性を高めるために、貼合面の一方又は両方に対して、例えばコロナ処理等の表面活性化処理を施すことが好ましい。 The laminate 200 can be manufactured by a method including a step of laminating the layers constituting the laminate via an adhesive layer or an adhesive layer. When the layers are bonded to each other via the pressure-sensitive adhesive layer or the adhesive layer, one or both of the bonded surfaces should be subjected to a surface activation treatment such as a corona treatment in order to improve the adhesion. Is preferable.
　偏光子４３は、基材４１上に配向膜４２を介して形成することが可能である。偏光子４３は、二色性色素及び重合性液晶化合物を含む偏光子形成用組成物を塗布し、硬化させることで形成することができる。偏光子形成用組成物は、上述の二色性色素及び重合性液晶化合物に加え、好ましくは重合開始剤、レベリング剤、溶剤をさらに含み、光増感剤、重合禁止剤等をさらに含み得る。 The polarizer 43 can be formed on the base material 41 via the alignment film 42. The polarizer 43 can be formed by applying a polarizing element-forming composition containing a dichroic dye and a polymerizable liquid crystal compound and curing the composition. The composition for forming a polarizer preferably further contains a polymerization initiator, a leveling agent, a solvent, and may further contain a photosensitizer, a polymerization inhibitor, and the like, in addition to the above-mentioned dichroic dye and polymerizable liquid crystal compound.
　位相差層６０は、基材及び存在する場合には配向膜上に、重合性液晶化合物を含む位相差層形成用組成物を塗布し、重合性液晶化合物を重合することで製造することができる。
位相差層形成用組成物は、溶剤、重合開始剤をさらに含み、光増感剤、重合禁止剤、レベリング剤等をさらに含み得る。基材及び配向膜は位相差層に組み込まれてもよいし、あるいは、位相差層から剥離されて積層体の構成要素とはならなくてもよい。 The retardation layer 60 can be produced by applying a composition for forming a retardation layer containing a polymerizable liquid crystal compound on a base material and an alignment film if present, and polymerizing the polymerizable liquid crystal compound. ..
The composition for forming a retardation layer further contains a solvent and a polymerization initiator, and may further contain a photosensitizer, a polymerization inhibitor, a leveling agent and the like. The base material and the alignment film may be incorporated into the retardation layer, or may not be separated from the retardation layer and become a component of the laminate.
　偏光子形成用組成物及び位相差層形成用組成物の塗布、乾燥および重合性液晶化合物の重合は、従来公知の塗布方法、乾燥方法及び重合方法により行うことができる。 The coating, drying, and polymerization of the polymerizable liquid crystal compound of the polarizer forming composition and the retardation layer forming composition can be carried out by conventionally known coating methods, drying methods, and polymerization methods.
　粘着剤層３０及び７０は粘着シートとして準備することができる。粘着シートは、例えばトルエンや酢酸エチル等の有機溶剤に粘着剤組成物を溶解または分散させて粘着剤液を調製し、これを離型処理が施された剥離フィルム上に粘着剤からなる層をシート状に形成しておき、その粘着剤層上にさらに別の剥離フィルムを貼合する方式等により作製することができる。一方の剥離フィルムを剥離した粘着シートを一方の層に貼合し、次いで他方の剥離フィルムを剥離し、他方の層を貼合する方法により各層を貼合することができる。積層体２００は、粘着剤層３０および粘着剤層７０が形成された円偏光板と、前面板１０とを貼合することにより製造されてもよいし、粘着剤層３０が形成された前面板１０と、粘着剤層７０が形成された円偏光板とを貼合することにより製造されてもよいし、粘着剤層３０が形成された前面板１０と、円偏光板とを貼合し、次いで粘着剤層７０を形成することにより製造されてもよい。 The pressure-sensitive adhesive layers 30 and 70 can be prepared as a pressure-sensitive adhesive sheet. The pressure-sensitive adhesive sheet is prepared by dissolving or dispersing the pressure-sensitive adhesive composition in an organic solvent such as toluene or ethyl acetate to prepare a pressure-sensitive adhesive liquid, and forming a layer of the pressure-sensitive adhesive on a release film that has been subjected to a mold release treatment. It can be produced by a method of forming it into a sheet shape and laminating another release film on the pressure-sensitive adhesive layer. Each layer can be bonded by a method in which the pressure-sensitive adhesive sheet from which one release film has been peeled off is attached to one layer, then the other release film is peeled off, and the other layer is attached. The laminate 200 may be manufactured by laminating a circularly polarizing plate on which the pressure-sensitive adhesive layer 30 and the pressure-sensitive adhesive layer 70 are formed and a front plate 10 or a front plate on which the pressure-sensitive adhesive layer 30 is formed. 10 may be manufactured by laminating the circular polarizing plate on which the pressure-sensitive adhesive layer 70 is formed, or the front plate 10 on which the pressure-sensitive adhesive layer 30 is formed and the circularly polarizing plate are bonded together. It may then be produced by forming a pressure-sensitive adhesive layer 70.
　＜画像表示装置＞
　画像表示装置としては特に限定されず、例えば、有機エレクトロルミネッセンス（有機ＥＬ）表示装置、無機エレクトロルミネッセンス（無機ＥＬ）表示装置、液晶表示装置、タッチパネル表示装置、電界発光表示装置等を挙げることができる。本実施の形態の画像表示装置は、屈曲可能な積層体を有するため、フレキシブルディスプレイに好適に用いることができ、特に有機ＥＬ表示装置に好適に用いることができる。 <Image display device>
The image 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, a touch panel display device, and an electroluminescence display device. .. Since the image display device of the present embodiment has a bendable laminated body, it can be suitably used for a flexible display, and particularly preferably for an organic EL display device.
　以下、実施例により本発明をさらに詳細に説明する。例中の「％」及び「部」は、特記のない限り、質量％及び質量部である。 Hereinafter, the present invention will be described in more detail by way of examples. Unless otherwise specified, "%" and "part" in the example are mass% and parts by mass.
　［層の厚み］
　接触式膜厚測定装置（株式会社ニコン製「ＭＳ－５Ｃ」）を用いて測定した。ただし、偏光子、位相差層および配向膜については、レーザー顕微鏡（ＬＥＸＴ、オリンパス株式会社製）を用いて測定した。 [Layer thickness]
The measurement was performed using a contact type film thickness measuring device (“MS-5C” manufactured by Nikon Corporation). However, the polarizer, the retardation layer, and the alignment film were measured using a laser microscope (LEXT, manufactured by Olympus Corporation).
　［引張弾性率測定方法］
　引張弾性率は、ＪＩＳ　Ｋ７１６１に準拠して、ＵＴＭ（Ｕｎｉｖｅｒｓａｌ　Ｔｅｓｔｉｎｇ　Ｍａｃｈｉｎｅ、オートグラフＡＧ－Ｘ、株式会社島津製作所）を用いて測定した。延伸条件は、耐湿熱環境下（温度６０℃、湿度９０％ＲＨ）で速度４ｍｍ／分、幅１０ｍｍ、標点距離５０ｍｍとした。 [Tensile modulus measurement method]
The tensile elastic modulus was measured using a UTM (Universal Testing Machine, Autograph AG-X, Shimadzu Corporation) in accordance with JIS K7161. The stretching conditions were a speed of 4 mm / min, a width of 10 mm, and a gauge distance of 50 mm under a moisture-resistant heat-resistant environment (temperature 60 ° C., humidity 90% RH).
　［うねり評価］
　各実施例および比較例で得られた積層体に、積層体が備える粘着剤層を介して、ポリエチレンテレフタレート（ＰＥＴ）フィルムを貼合し、試験片を得た。ＰＥＴフィルムは、画像表示素子を模したものであり、その厚みは１００μｍであった。試験片をレーザーカットし、下記条件の耐湿熱屈曲試験を施した後、屈曲部のうねりを干渉顕微鏡を用いて測定した。うねりは、積層体の前面板が上方になるように干渉顕微鏡に設置し、干渉顕微鏡により積層体の屈曲部の前面板側表面に観察される凹凸のうち、最も高い箇所と最も低い箇所との高低差の平均値（ｎ＝６）として求めた。
　（耐湿熱屈曲試験）
　積層体を前面板側を内側にして曲率半径１ｍｍ（１Ｒ）で屈曲した状態で、温度６０℃及び相対湿度９０％ＲＨの雰囲気下、１０日間放置した。 [Waviness evaluation]
A polyethylene terephthalate (PET) film was attached to the laminates obtained in each Example and Comparative Example via an adhesive layer provided in the laminate to obtain a test piece. The PET film imitated an image display element, and its thickness was 100 μm. The test piece was laser-cut and subjected to a moisture-resistant heat bending test under the following conditions, and then the swell of the bent portion was measured using an interference microscope. The swell is installed in the interference microscope so that the front plate of the laminated body faces upward, and among the irregularities observed on the front plate side surface of the bent portion of the laminated body by the interference microscope, the highest point and the lowest point are It was calculated as the average value of the height difference (n = 6).
(Moisture resistance heat bending test)
The laminate was allowed to stand for 10 days in an atmosphere of a temperature of 60 ° C. and a relative humidity of 90% RH in a state of being bent with a radius of curvature of 1 mm (1R) with the front plate side inside.
　［視認性］
　うねり評価後の積層体を、屈曲した状態を開放して平面状態にした。この積層体を蛍光灯下に前面板側が上方となるように設置し、積層体表面に映り込んだ蛍光灯の像を観察した。折り曲げた部分において、蛍光灯の像に歪みが視認されない場合を○とし、蛍光灯の像に歪みが視認される場合を×とした。 [Visibility]
The laminated body after the swell evaluation was made into a flat state by opening the bent state. This laminated body was installed under the fluorescent lamp so that the front plate side was upward, and the image of the fluorescent lamp reflected on the surface of the laminated body was observed. In the bent portion, the case where the distortion was not visually recognized in the fluorescent lamp image was marked with ◯, and the case where the distortion was visually recognized in the fluorescent lamp image was marked with x.
　［前面板１］
　（ポリアミドイミドフィルム）
　窒素ガス雰囲気下、撹拌翼を備えた１Ｌセパラブルフラスコに、２，２’－ビス（トリフルオロメチル）ベンジジン（ＴＦＭＢ）１４．６７ｇ（４５．８ｍｍｏｌ）および水分量を２００ｐｐｍに調製したＮ，Ｎ－ジメチルアセトアミド（ＤＭＡｃ）２３３．３ｇを加え、室温で撹拌しながらＴＦＭＢをＤＭＡｃに溶解させた。次に、フラスコに４，４’－オキシジフタル酸二無水物（ＯＰＤＡ）４．２８３ｇ（１３．８ｍｍｏｌ）を加え、室温で１６．５時間撹拌した。その後、４，４’－オキシビス（ベンゾイルクロリド）（ＯＢＢＣ）１．３５９ｇ（４．６１ｍｍｏｌ）およびテレフタロイルクロリド（ＴＰＣ）５．６０９ｇ（２７．６ｍｍｏｌ）をフラスコに加え、室温で１時間撹拌した。次いで、フラスコに無水酢酸４．９３７ｇ（４８．３５ｍｍｏｌ）と４－ピコリン１．５０１ｇ（１６．１２ｍｍｏｌ）とを加え、室温で３０分間撹拌後、オイルバスを用いて７０℃に昇温し、さらに３時間撹拌し、反応液を得た。
　得られた反応液を室温まで冷却した後、メタノール３６０ｇおよびイオン交換水１７０ｇを加えてポリアミドイミドの沈殿を得た。それをメタノール中に１２時間浸漬し、濾過で回収してメタノールで洗浄した。次に、１００℃にて沈殿物の減圧乾燥を行い、厚み５０μｍのポリアミドイミド（ＰＡＩ）樹脂を得た。 [Front plate 1]
(Polyamide-imide film)
In a nitrogen gas atmosphere, 14.67 g (45.8 mmol) of 2,2'-bis (trifluoromethyl) benzidine (TFMB) and a water content of 200 ppm were prepared in a 1 L separable flask equipped with a stirring blade. -233.3 g of dimethylacetamide (DMAc) was added, and TFMB was dissolved in DMAc with stirring at room temperature. Next, 4.283 g (13.8 mmol) of 4,4′-oxydiphthalic dianhydride (OPDA) was added to the flask, and the mixture was stirred at room temperature for 16.5 hours. Then, 1.359 g (4.61 mmol) of 4,4'-oxybis (benzoyl chloride) (OBBC) and 5.609 g (27.6 mmol) of terephthaloyl chloride (TPC) were added to the flask, and the mixture was stirred at room temperature for 1 hour. .. Next, 4.937 g (48.35 mmol) of acetic anhydride and 1.501 g (16.12 mmol) of 4-picoline were added to the flask, and the mixture was stirred at room temperature for 30 minutes, heated to 70 ° C. using an oil bath, and further. The mixture was stirred for 3 hours to obtain a reaction solution.
After cooling the obtained reaction solution to room temperature, 360 g of methanol and 170 g of ion-exchanged water were added to obtain a precipitate of polyamide-imide. It was immersed in methanol for 12 hours, collected by filtration and washed with methanol. Next, the precipitate was dried under reduced pressure at 100 ° C. to obtain a polyamide-imide (PAI) resin having a thickness of 50 μm.
　（ＨＣ層形成用組成物１）
　ＨＣ層形成用組成物１は、多官能アクリレート（Ｍｉｒａｍｅｒ　Ｍ３４０、Ｍｉｗｏｎ　Ｓｐｅｃｉａｌｔｙ　Ｃｈｅｍｉｃａｌ製）３０質量部と、ナノシリカゾルのプロピレングリコールモノメチルエーテル分散体（１２ｎｍ、固形分４０％）５０質量部と、エチルアセテート１７質量部と、光重合開始剤（Ｉｒｇａｃｕｒｅ－１８４、Ｃｉｂａ　Ｃｏｒｐｏｒａｔｉｏｎ製）２．７質量部と、フッ素系添加剤（ＫＹ１２０３、信越化学工業株式会社製）０．３質量部とを含む。 (Composition for forming HC layer 1)
The composition 1 for forming an HC layer contains 30 parts by mass of a polyfunctional acrylate (Miramer M340, manufactured by Miwon Specialy Chemical), 50 parts by mass of a propylene glycol monomethyl ether dispersion (12 nm, solid content 40%) of a nanosilica sol, and ethyl acetate. It contains 17 parts by mass, 2.7 parts by mass of a photopolymerization initiator (Irgacure-184, manufactured by Ciba Corporation), and 0.3 parts by mass of a fluorine-based additive (KY1203, manufactured by Shin-Etsu Chemical Industry Co., Ltd.).
　（前面板１の作製）
　上記ＨＣ層形成用組成物をポリアミドイミドフィルムの一方の面に塗工し、得られた塗膜を温度８０℃で５分間乾燥し、ＵＶ照射装置（ＳＰＯＴ　ＣＵＲＥ　ＳＰ－７、ウシオ電機株式会社製）を用いて、露光量５００ｍＪ／ｃｍ２（３６５ｎｍ基準）のＵＶ光を照射してＨＣ層１を形成した。硬化後の厚みが１０．０μｍになるように塗工した。以上のようにして、ＨＣ層１／５０μｍのポリアミドイミドフィルムの構成を有する前面板１を得た。 (Making the front plate 1)
The above composition for forming an HC layer is applied to one surface of a polyamide-imide film, and the obtained coating film is dried at a temperature of 80 ° C. for 5 minutes to obtain a UV irradiation device (SPOT CURE SP-7, manufactured by Ushio Denki Co., Ltd.). ) Was irradiated with UV light having an exposure amount of 500 mJ / cm 2 (365 nm standard) to form the HC layer 1. The coating was applied so that the thickness after curing was 10.0 μm. As described above, a front plate 1 having a polyamide-imide film structure having an HC layer of 1/50 μm was obtained.
　［前面板２］
　前面板１のポリアミドイミドフィルムの調製においてＯＰＤＡ４．２８３ｇに代えて４，４’－（ヘキサフルオロイソプロピリデン）ジフタル酸二無水物（６ＦＤＡ）６．１４０ｇを用い、ＴＦＭＢ１４．６７ｇ（４５．８ｍｍｏｌ）に代えてＴＦＭＢ８．８０９ｇ（２７．５ｍｍｏｌ）および２，２’－ジメチルベンジジン（ＭＢ）３．８８９ｇ（１８．３ｍｍｏｌ）を用いた以外は、前面板１のポリアミドイミドフィルムの調製と同様にして、厚み４０μｍのポリアミドイミド樹脂を得た。 [Front plate 2]
In the preparation of the polyamide-imide film for the front plate 1, 6.140 g of 4,4'-(hexafluoroisopropylidene) diphthalic acid dianhydride (6FDA) was used instead of 4.283 g of OPDA to 14.67 g (45.8 mmol) of TFMB. Thickness similar to the preparation of the polyamide-imide film of the front plate 1 except that TFMB 8.809 g (27.5 mmol) and 2,2'-dimethylbenzidine (MB) 3.889 g (18.3 mmol) were used instead. A 40 μm polyamide-imide resin was obtained.
　［前面板３］
　シクロオレフィン（ＣＯＰ）フィルム（厚み４０μｍ、日本ゼオン株式会社製）を準備した。 [Front plate 3]
A cycloolefin (COP) film (thickness 40 μm, manufactured by Nippon Zeon Corporation) was prepared.
　［前面板４］
　トリアセチルセルロース（ＴＡＣ）フィルム（厚み４０μｍ）を準備した。 [Front plate 4]
A triacetyl cellulose (TAC) film (thickness 40 μm) was prepared.
　［偏光子形成用組成物の調製］
　（重合性液晶化合物）
　重合性液晶化合物は、式（１－６）で表される重合性液晶化合物［以下、化合物（１－６）ともいう］と式（１－７）で表される重合性液晶化合物［以下、化合物（１－７）ともいう］とを用いた。 [Preparation of composition for forming a polarizer]
(Polymerizable liquid crystal compound)
The polymerizable liquid crystal compound is a polymerizable liquid crystal compound represented by the formula (1-6) [hereinafter, also referred to as compound (1-6)] and a polymerizable liquid crystal compound represented by the formula (1-7) [hereinafter, Also referred to as compound (1-7)].
Figure JPOXMLDOC01-appb-C000001
Figure JPOXMLDOC01-appb-C000001
Figure JPOXMLDOC01-appb-C000002
Figure JPOXMLDOC01-appb-C000002
　化合物（１－６）および化合物（１－７）は、Ｌｕｂ　ｅｔ　ａｌ．Ｒｅｃｌ．Ｔｒａｖ．Ｃｈｉｍ．Ｐａｙｓ－Ｂａｓ、１１５、３２１－３２８（１９９６）記載の方法により合成した。 Compound (1-6) and compound (1-7) are described in Lub et al. Recl. Trav. Chim. It was synthesized by the method described in Pays-Bas, 115, 321-328 (1996).
　（二色性色素）
　二色性色素には、下記式（２－１ａ）、（２－１ｂ）、（２－３ａ）で示される特開２０１３－１０１３２８号公報の実施例に記載のアゾ色素を用いた。 (Dichroic pigment)
As the dichroic dye, the azo dye described in Examples of Japanese Patent Application Laid-Open No. 2013-101328 represented by the following formulas (2-1a), (2-1b) and (2-3a) was used.
Figure JPOXMLDOC01-appb-C000003
Figure JPOXMLDOC01-appb-C000003
Figure JPOXMLDOC01-appb-C000004
Figure JPOXMLDOC01-appb-C000004
Figure JPOXMLDOC01-appb-C000005
Figure JPOXMLDOC01-appb-C000005
　（偏光子形成用組成物の調製）
　偏光子形成用組成物は、化合物（１－６）７５質量部、化合物（１－７）２５質量部、二色性染料としての上記式（２－１ａ）、（２－１ｂ）、（２－３ａ）で示されるアゾ色素各２．５質量部、重合開始剤としての２－ジメチルアミノ－２－ベンジル－１－（４－モルホリノフェニル）ブタン－１－オン（Ｉｒｇａｃｕｒｅ３６９、ＢＡＳＦジャパン社製）６質量部、およびレベリング剤としてのポリアクリレート化合物（ＢＹＫ－３６１Ｎ、ＢＹＫ－Ｃｈｅｍｉｅ社製）１．２質量部を、溶剤のトルエン４００質量部に混合し、得られた混合物を８０℃で１時間攪拌することにより調製した。 (Preparation of composition for forming a polarizer)
The composition for forming a polarizer contains 75 parts by mass of compound (1-6), 25 parts by mass of compound (1-7), and the above formulas (2-1a), (2-1b), (2) as a bicolor dye. 2.5 parts by mass of each of the azo dyes represented by -3a), 2-dimethylamino-2-benzyl-1- (4-morpholinophenyl) butane-1-one as a polymerization initiator (Irgacure 369, manufactured by BASF Japan) 6 parts by mass and 1.2 parts by mass of a polyacrylate compound (BYK-361N, manufactured by BYK-Chemie) as a leveling agent were mixed with 400 parts by mass of toluene as a solvent, and the obtained mixture was mixed at 80 ° C. for 1 hour. Prepared by stirring.
　［粘着剤層１］
　下記の表１に示す各成分の割合にて粘着剤層１を形成する粘着剤組成物を調製した。この粘着剤組成物を離型処理されたポリエチレンテレフタレートフィルム（厚み３８μｍ）の離型処理面に、アプリケータを利用して乾燥後の厚みが２５μｍになるように塗布した。塗布層を１００℃で１分間乾燥して、粘着剤層１を備えるフィルムを得た。その後、粘着剤層１上に、離型処理された別のポリエチレンテレフタレートフィルム（厚み３８μｍ）を貼合した。その後、温度２３℃、相対湿度５０％ＲＨの条件で７日間養生させた。
　表１中の単量体の欄における記号は以下の意味を表す。
ＢＡ：アクリル酸ブチル
ＭＭＡ：アクリル酸メチル
ＥＨＡ：アクリル酸２－エチルヘキシル
ＡＡ：アクリル酸
　表１中の架橋剤及びシランカップリング剤は以下のものを用いた。
架橋剤：コロネートＬ（東ソー株式会社製）
シランカップリング剤：ＫＢＭ－４０３（信越化学工業株式会社製） [Adhesive layer 1]
A pressure-sensitive adhesive composition for forming the pressure-sensitive adhesive layer 1 was prepared at the ratio of each component shown in Table 1 below. This pressure-sensitive adhesive composition was applied to the release-treated surface of the release-treated polyethylene terephthalate film (thickness 38 μm) using an applicator so that the thickness after drying was 25 μm. The coating layer was dried at 100 ° C. for 1 minute to obtain a film having the pressure-sensitive adhesive layer 1. Then, another polyethylene terephthalate film (thickness 38 μm) that had been released from the mold was attached onto the pressure-sensitive adhesive layer 1. Then, it was cured for 7 days under the conditions of a temperature of 23 ° C. and a relative humidity of 50% RH.
The symbols in the column of monomers in Table 1 have the following meanings.
BA: Butyl acrylate MMA: Methyl acrylate EHA: 2-Ethylhexyl acrylate AA: Acrylic acid The following cross-linking agents and silane coupling agents were used in Table 1.
Crosslinking agent: Coronate L (manufactured by Tosoh Corporation)
Silane coupling agent: KBM-403 (manufactured by Shin-Etsu Chemical Co., Ltd.)
　［粘着剤層２］
　乾燥後の厚みが５μｍになるようにしたこと以外は、粘着剤層１と同様にして粘着剤層２を備えるフィルムを得た。 [Adhesive layer 2]
A film having the pressure-sensitive adhesive layer 2 was obtained in the same manner as the pressure-sensitive adhesive layer 1 except that the thickness after drying was set to 5 μm.
　［粘着剤層３］
　下記の表１に示す各成分の割合にて粘着剤層３を形成する粘着剤組成物を調製した。この粘着剤組成物を離型処理されたポリエチレンテレフタレートフィルム（厚み３８μｍ）の離型処理面に、アプリケータを利用して乾燥後の厚みが５μｍになるように塗布した。
塗布層を１００℃で１分間乾燥して、粘着剤層３を備えるフィルムを得た。その後、粘着剤層上に、離型処理された別のポリエチレンテレフタレートフィルム（厚み３８μｍ）を貼合した。その後、温度２３℃、相対湿度５０％ＲＨの条件で７日間養生させた。 [Adhesive layer 3]
A pressure-sensitive adhesive composition for forming the pressure-sensitive adhesive layer 3 was prepared at the ratio of each component shown in Table 1 below. This pressure-sensitive adhesive composition was applied to the release-treated surface of the release-treated polyethylene terephthalate film (thickness 38 μm) using an applicator so that the thickness after drying was 5 μm.
The coating layer was dried at 100 ° C. for 1 minute to obtain a film having the pressure-sensitive adhesive layer 3. Then, another release-treated polyethylene terephthalate film (thickness 38 μm) was laminated on the pressure-sensitive adhesive layer. Then, it was cured for 7 days under the conditions of a temperature of 23 ° C. and a relative humidity of 50% RH.
Figure JPOXMLDOC01-appb-T000006
Figure JPOXMLDOC01-appb-T000006
　［基材１］
　トリアセチルセルロース（ＴＡＣ）フィルム（厚み２５μｍ）を準備した。 [Base material 1]
A triacetyl cellulose (TAC) film (thickness 25 μm) was prepared.
　［基材２］
　（ＨＣ層形成用組成物２）
　１８官能のアクリロイルオキシ基（アクリル基ということがある）を有するデンドリマーアクリレート（Ｍｉｒａｍｅｒ　ＳＰ１１０６、Ｍｉｗｏｎ　Ｓｐｅｃｉａｌｉｔｙ　Ｃｈｅｍｉｃａｌ社）２．０質量部、６官能のアクリル基を有するウレタンアクリレート（Ｍｉｒａｍｅｒ　ＰＵ－６２０Ｄ、Ｍｉｗｏｎ　Ｓｐｅｃｉａｌｉｔｙ　Ｃｈｅｍｉｃａｌ社）１０．０質量部、３官能のアクリル基を有するアクリレートモノマー（Ｍ３４０、Ｍｉｗｏｎ　Ｓｐｅｃｉａｌｉｔｙ　Ｃｈｅｍｉｃａｌ社）８質量部、光重合開始剤（イルガキュア（登録商標）１８４、ＢＡＳＦ社製）２質量部、及びレベリング剤（ＢＹＫ－ＵＶ３５３０、ビックケミー・ジャパン株式会社）０．１質量部を、メチルエチルケトン（ＭＥＫ）７０質量部に溶解させて攪拌混合し、ハードコート層形成用組成物２を得た。 [Base material 2]
(Composition for forming HC layer 2)
Dendrimer acrylate (Miramer SP1106, Miwon Speciality Chemical) having 18-functional acryloyloxy group (sometimes referred to as acrylic group) 2.0 parts by mass, urethane acrylate (Miramer PU-620D, Miwon Speciality) having 6-functional acrylic group Chemical) 10.0 parts by mass, acrylate monomer having a trifunctional acrylic group (M340, Miwon Speciality Chemical) 8 parts by mass, photopolymerization initiator (Irgacure (registered trademark) 184, BASF) 2 parts by mass, And 0.1 part by mass of the leveling agent (BYK-UV3530, Big Chemie Japan Co., Ltd.) was dissolved in 70 parts by mass of methyl ethyl ketone (MEK) and mixed by stirring to obtain a composition 2 for forming a hard coat layer.
　（基材２の作製）
　上記ＨＣ層形成用組成物２をシクロオレフィン（ＣＯＰ）フィルム（厚み１３μｍ）の一方の面に塗工し、得られた塗膜を温度８０℃で５分間乾燥し、ＵＶ照射装置（ＳＰＯＴ　ＣＵＲＥ　ＳＰ－７、ウシオ電機株式会社製）を用いて、露光量５００ｍＪ／ｃｍ２（３６５ｎｍ基準）のＵＶ光を照射してＨＣ層２を形成した。硬化後の厚みが２μｍになるように塗工した。以上のようにして、基材２を得た。 (Preparation of base material 2)
The HC layer forming composition 2 is applied to one surface of a cycloolefin (COP) film (thickness 13 μm), the obtained coating film is dried at a temperature of 80 ° C. for 5 minutes, and a UV irradiation device (SPOT CURE SP) is applied. The HC layer 2 was formed by irradiating UV light with an exposure amount of 500 mJ / cm 2 (365 nm standard) using -7, manufactured by Ushio Denki Co., Ltd. The coating was applied so that the thickness after curing was 2 μm. As described above, the base material 2 was obtained.
　［λ／４層］
　下記構造の光配向性材料５部（重量平均分子量：３０，０００）とシクロペンタノン９５部とを混合し、得られた混合物を８０℃で１時間攪拌することにより、水平配向膜形成用組成物を得た。 [Λ / 4 layer]
A composition for forming a horizontal alignment film is obtained by mixing 5 parts (weight average molecular weight: 30,000) of a photooriented material having the following structure and 95 parts of cyclopentanone, and stirring the obtained mixture at 80 ° C. for 1 hour. I got something.
Figure JPOXMLDOC01-appb-C000007
Figure JPOXMLDOC01-appb-C000007
　以下に示す重合性液晶化合物Ａ、及び重合性液晶化合物Ｂを９０：１０の質量比で混合した混合物１００部に対して、レベリング剤（Ｆ－５５６；ＤＩＣ株式会社製）を１．０部、及び重合開始剤である２－ジメチルアミノ－２－ベンジル－１－（４－モルホリノフェニル）ブタン－１－オン（「イルガキュア３６９（Ｉｒｇ３６９）」、ＢＡＳＦジャパン株式会社製）を６部添加した。 1.0 part of the leveling agent (F-556; manufactured by DIC Corporation) was added to 100 parts of the mixture of the polymerizable liquid crystal compound A and the polymerizable liquid crystal compound B shown below at a mass ratio of 90:10. And 6 parts of 2-dimethylamino-2-benzyl-1- (4-morpholinophenyl) butane-1-one (“Irgacure 369 (Irg369)”, manufactured by BASF Japan Ltd.), which is a polymerization initiator, was added.
　さらに、固形分濃度が１３％となるようにＮ－メチル－２－ピロリドン（ＮＭＰ）を添加し、８０℃で１時間攪拌することにより、位相差層形成用組成物（１）を得た。 Further, N-methyl-2-pyrrolidone (NMP) was added so that the solid content concentration was 13%, and the mixture was stirred at 80 ° C. for 1 hour to obtain a retardation layer forming composition (1).
　重合性液晶化合物Ａは、特開２０１０－３１２２３号公報に記載された方法で製造した。また、重合性液晶化合物Ｂは、特開２００９－１７３８９３号公報に記載された方法に準じて製造した。以下にそれぞれの分子構造を示す。 The polymerizable liquid crystal compound A was produced by the method described in JP-A-2010-31223. Further, the polymerizable liquid crystal compound B was produced according to the method described in JP-A-2009-173893. The molecular structure of each is shown below.
（重合性液晶化合物Ａ） (Polymerizable liquid crystal compound A)
Figure JPOXMLDOC01-appb-C000008
Figure JPOXMLDOC01-appb-C000008
（重合性液晶化合物Ｂ） (Polymerizable liquid crystal compound B)
Figure JPOXMLDOC01-appb-C000009
Figure JPOXMLDOC01-appb-C000009
　シクロオレフィンポリマー（ＣＯＰ）フィルム（日本ゼオン株式会社製、ＺＦ－１４、厚み２３μｍ）からなる基材フィルムを、コロナ処理装置（ＡＧＦ－Ｂ１０、春日電機株式会社製）を用いて出力０．３ｋＷ、処理速度３ｍ／分の条件で１回コロナ処理した。コロナ処理を施した基材の表面に、水平配向膜形成用組成物をバーコーターにより塗布した。塗布膜を８０℃で１分間乾燥し、偏光ＵＶ照射装置（ＳＰＯＴ　ＣＵＲＥ　ＳＰ－７；ウシオ電機株式会社製）を用いて、１００ｍＪ／ｃｍ２の積算光量で偏光ＵＶ露光を実施した。得られた水平配向膜の厚みをレーザー顕微鏡（ＬＥＸＴ、オリンパス株式会社製）で測定したところ、１００ｎｍであった。 A base film made of a cycloolefin polymer (COP) film (manufactured by Nippon Zeon Co., Ltd., ZF-14, thickness 23 μm) was produced using a corona treatment device (AGF-B10, manufactured by Kasuga Electric Works Ltd.) at an output of 0.3 kW. Corona treatment was performed once under the condition of a treatment speed of 3 m / min. The composition for forming a horizontal alignment film was applied to the surface of the corona-treated substrate by a bar coater. The coating film was dried at 80 ° C. for 1 minute, and polarized UV exposure was performed using a polarized UV irradiator (SPOT CURE SP-7; manufactured by Ushio, Inc.) with an integrated light intensity of 100 mJ / cm 2 . The thickness of the obtained horizontal alignment film was measured with a laser microscope (LEXT, manufactured by Olympus Corporation) and found to be 100 nm.
　続いて、室温２５℃、湿度３０％ＲＨ環境下において、位相差層形成用組成物（１）を孔径０．２μｍのＰＴＦＥ製メンブレンフィルタ（アドバンテック東洋（株）製、品番；Ｔ３００Ａ０２５Ａ）に通し、２５℃に保温した配向膜付き基材フィルム上にバーコーターを用いて塗布した。塗膜を１２０℃で１分間乾燥した後、高圧水銀ランプ（ユニキュアＶＢ―１５２０１ＢＹ－Ａ、ウシオ電機株式会社製）を用いて、紫外線を照射（窒素雰囲気下、波長：３６５ｎｍ、波長３６５ｎｍにおける積算光量：１０００ｍＪ／ｃｍ２）することにより光学フィルムを作成した。得られた塗膜の厚みをレーザー顕微鏡（ＬＥＸＴ、オリンパス株式会社製）で測定したところ２μｍであった。 Subsequently, the composition for forming a retardation layer (1) was passed through a PTFE membrane filter (manufactured by Advantech Toyo Co., Ltd., product number; T300A025A) having a pore size of 0.2 μm in an environment of room temperature of 25 ° C. and humidity of 30% RH. It was applied using a bar coater on a base film with an alignment film kept at 25 ° C. After the coating film is dried at 120 ° C. for 1 minute, it is irradiated with ultraviolet rays using a high-pressure mercury lamp (Unicure VB-15201BY-A, manufactured by Ushio Denki Co., Ltd.) (in a nitrogen atmosphere, wavelength: 365 nm, integrated light intensity at wavelength 365 nm). : An optical film was prepared by 1000 mJ / cm 2 ). The thickness of the obtained coating film was measured with a laser microscope (Lext, manufactured by Olympus Corporation) and found to be 2 μm.
　このようにして、重合性液晶化合物が硬化した層（λ／４層）、水平配向膜及び基材フィルムがこの順に積層された積層体（位相差層１）を得た。位相差層１は逆波長分散性を示した。 In this way, a layer (λ / 4 layer) in which the polymerizable liquid crystal compound was cured, a horizontally aligned film, and a base film were laminated in this order (phase difference layer 1). The retardation layer 1 showed anti-wavelength dispersibility.
　［ポジティブＣ層］
　垂直配向膜形成用組成物として、２－フェノキシエチルアクリレートと、テトラヒドロフルフリルアクリレートと、ジペンタエリスリトールトリアクリレートと、ビス（２－ビニルオキシエチル）エーテルとを１：１：４：５の割合で混合し、重合開始剤としてＬＵＣＩＲＩＮ　ＴＰＯを４％の割合で添加した混合物を用いた。 [Positive C layer]
As a composition for forming a vertically oriented film, 2-phenoxyethyl acrylate, tetrahydrofurfuryl acrylate, dipentaerythritol triacrylate, and bis (2-vinyloxyethyl) ether are mixed in a ratio of 1: 1: 4: 5. A mixture was mixed and LUCIRIN TPO was added as a polymerization initiator at a ratio of 4%.
　位相差層形成用組成物（２）は、光重合性ネマチック液晶化合物（メルク社製，ＲＭＭ２８Ｂ）と溶媒とを、固形分が１～１．５ｇとなるように調製して作製した。溶媒は、メチルエチルケトン（ＭＥＫ）と、メチルイソブチルケトン（ＭＩＢＫ）と、シクロヘキサノン（ＣＨＮ）とを、質量比（ＭＥＫ：ＭＩＢＫ：ＣＨＮ）で３５：３０：３５の割合で混合させた混合溶媒を用いた。 The retardation layer forming composition (2) was prepared by preparing a photopolymerizable nematic liquid crystal compound (manufactured by Merck & Co., Inc., RMM28B) and a solvent so that the solid content was 1 to 1.5 g. As the solvent, a mixed solvent in which methyl ethyl ketone (MEK), methyl isobutyl ketone (MIBK), and cyclohexanone (CHN) were mixed at a mass ratio (MEK: MIBK: CHN) of 35:30:35 was used. ..
　厚み３８μｍのポリエチレンテレフタレート（ＰＥＴ）フィルムを基材フィルムとして準備した。基材フィルムの片面に垂直配向膜形成用組成物を膜厚３μｍになるように塗布し、２００ｍＪ／ｃｍ２の紫外線を照射して、垂直配向膜を作製した。 A polyethylene terephthalate (PET) film having a thickness of 38 μm was prepared as a base film. A composition for forming a vertical alignment film was applied to one side of the base film so as to have a thickness of 3 μm, and an ultraviolet ray of 200 mJ / cm 2 was irradiated to prepare a vertical alignment film.
　垂直配向層上に、位相差層形成用組成物（２）を、ダイコーティングにより塗工した。
塗工量は４～５ｇ（ｗｅｔ）であった。乾燥温度を７５℃、乾燥時間を１２０秒間として、塗膜を乾燥させた。その後、塗膜に紫外線（ＵＶ）照射して、重合性液晶化合物を重合させた。得られた塗膜の厚みをレーザー顕微鏡（ＬＥＸＴ、オリンパス株式会社製）で測定したところ１μｍであった。 The composition for forming a retardation layer (2) was coated on the vertically oriented layer by die coating.
The coating amount was 4 to 5 g (wet). The coating film was dried at a drying temperature of 75 ° C. and a drying time of 120 seconds. Then, the coating film was irradiated with ultraviolet rays (UV) to polymerize the polymerizable liquid crystal compound. The thickness of the obtained coating film was measured with a laser microscope (Lext, manufactured by Olympus Corporation) and found to be 1 μm.
　このようにして、重合性液晶化合物が硬化した層（ポジティブＣ層）、垂直配向膜、及び基材フィルムがこの順に積層された積層体（位相差層２）を得た。位相差層２は重合性液晶化合物が硬化した層と配向膜との合計の厚みは４μｍであった。 In this way, a layer in which the polymerizable liquid crystal compound was cured (positive C layer), a vertically oriented film, and a base film were laminated in this order (phase difference layer 2). The total thickness of the retardation layer 2 was 4 μm, which was the cured layer of the polymerizable liquid crystal compound and the alignment film.
　[位相差層]
　上述の位相差層１と位相差層２とを、基材フィルム側の表面とは反対側の表面が貼合面となるように粘着剤層３を介して貼り合わせて、基材フィルム／水平配向膜／（λ／４層）／粘着剤層３／ポジティブＣ層／垂直配向膜／基材フィルムの構成を有する位相差層を得た。 [Phase difference layer]
The above-mentioned retardation layer 1 and the retardation layer 2 are bonded to each other via the pressure-sensitive adhesive layer 3 so that the surface opposite to the surface on the base film side is the bonding surface, and the base film / horizontal A retardation layer having the composition of an alignment film / (λ / 4 layer) / adhesive layer 3 / positive C layer / vertical alignment film / base film was obtained.
　＜実施例１＞
　まず、基材１を準備した。基材１上に、配向膜形成用組成物をバーコート法により塗布した。塗膜を８０℃で１分間乾燥した。次いで上記ＵＶ照射装置およびワイヤーグリッドを用いて、塗膜に偏光ＵＶを照射し、塗膜に配向性能を付与した。露光量は１００ｍＪ／ｃｍ２（３６５ｎｍ基準）であった。ワイヤーグリッドは、ＵＩＳ－２７１３２＃＃（ウシオ電機株式会社製）を用いた。このようにして、配向膜を形成した。配向膜の厚みは１００ｎｍであった。 <Example 1>
First, the base material 1 was prepared. The composition for forming an alignment film was applied onto the base material 1 by the bar coating method. The coating was dried at 80 ° C. for 1 minute. Next, using the above UV irradiation device and wire grid, the coating film was irradiated with polarized UV to impart orientation performance to the coating film. The exposure amount was 100 mJ / cm 2 (based on 365 nm). As the wire grid, UIS-27132 ## (manufactured by Ushio, Inc.) was used. In this way, the alignment film was formed. The thickness of the alignment film was 100 nm.
　形成した配向膜上に、上記偏光子形成用組成物をバーコート法により塗布した。塗膜を１００℃で２分間加熱乾燥した後、室温まで冷却した。上記ＵＶ照射装置を用いて、積算光量１２００ｍＪ／ｃｍ２（３６５ｎｍ基準）で紫外線を、塗膜に照射することにより、偏光子を形成した。得られた偏光子の厚みは３μｍであった。偏光子上に、ポリビニルアルコールと水とを含む組成物を、乾燥後の厚みが０．５μｍとなるように塗工し、温度８０℃で３分間乾燥して保護層を形成した。このようにして、基材１／配向膜／偏光子／保護層の構成を有する直線偏光板を作製した。 The above-mentioned composition for forming a polarizer was applied onto the formed alignment film by a bar coating method. The coating film was heated and dried at 100 ° C. for 2 minutes and then cooled to room temperature. A polarizer was formed by irradiating the coating film with ultraviolet rays at an integrated light amount of 1200 mJ / cm 2 (365 nm standard) using the above UV irradiation device. The thickness of the obtained polarizer was 3 μm. A composition containing polyvinyl alcohol and water was applied onto the polarizer so that the thickness after drying was 0.5 μm, and dried at a temperature of 80 ° C. for 3 minutes to form a protective layer. In this way, a linear polarizing plate having a structure of base material 1 / alignment film / polarizer / protective layer was produced.
　前面板１のＨＣ層１とは反対側の面と、粘着剤層１を備えるフィルムの一方のポリエチレンテレフタレートフィルムを剥離して露出させた粘着剤層１の面とにコロナ処理を施した後、両者を貼り合わせた。 After corona treatment is applied to the surface of the front plate 1 opposite to the HC layer 1 and the surface of the pressure-sensitive adhesive layer 1 exposed by peeling off one polyethylene terephthalate film of the film provided with the pressure-sensitive adhesive layer 1. Both were pasted together.
　次いで粘着剤層１からもう一方のポリエチレンテレフタレートフィルムを剥離して露出させた粘着剤層１の面と、直線偏光板の基材１側の面とにコロナ処理を施した後、両者を貼り合わせた。その後、直線偏光板の保護層側の面と、粘着剤層３を備えるフィルムの一方のポリエチレンテレフタレートフィルムを剥離して露出させた粘着剤層３の面とにコロナ処理を施した後、両者を貼り合わせた。次に粘着剤層３からもう一方のポリエチレンテレフタレートフィルムを剥離して粘着剤層３を露出させた。このようにして、前面板１／粘着剤層１／基材１／配向膜／偏光子／保護層／粘着剤層３の構成を有する積層体を得た。 Next, the surface of the pressure-sensitive adhesive layer 1 exposed by peeling off the other polyethylene terephthalate film from the pressure-sensitive adhesive layer 1 and the surface of the linear polarizing plate on the base material 1 side are subjected to corona treatment, and then the two are bonded together. It was. Then, the surface of the linear polarizing plate on the protective layer side and the surface of the pressure-sensitive adhesive layer 3 exposed by peeling off one polyethylene terephthalate film of the film provided with the pressure-sensitive adhesive layer 3 are subjected to corona treatment, and then both are subjected to corona treatment. I pasted them together. Next, the other polyethylene terephthalate film was peeled off from the pressure-sensitive adhesive layer 3 to expose the pressure-sensitive adhesive layer 3. In this way, a laminate having the composition of front plate 1 / pressure-sensitive adhesive layer 1 / base material 1 / alignment film / polarizer / protective layer / pressure-sensitive adhesive layer 3 was obtained.
　上述の位相差層から、位相差層１の形成に用いた基材フィルムを剥離した。露出させたλ／４層と粘着剤層３とを貼り合わせた。偏光子の吸収軸と、λ／４層の遅相軸とのなす角度は４５°であった。次に、位相差層２の形成に用いた基材フィルムを剥離し、ポジティブＣ層を露出させた。その後、別の粘着剤層１を備えるフィルムを準備し、一方のポリエチレンテレフタレートフィルムを剥離し、粘着剤層１の面を露出させた。露出したポジティブＣ層の面と、粘着剤層１の面とにコロナ処理を施した後、両者を貼り合わせた。次いで粘着剤層１からもう一方のポリエチレンテレフタレートフィルムを剥離した。このようにして、前面板１／粘着剤層１／基材１／配向膜／偏光子／保護層／粘着剤層３／（λ／４層）／粘着剤層３／ポジティブＣ層／粘着剤層１の構成を有する実施例１の積層体を得た。結果を表２に示す。実施例１において、両面粘着剤層付円偏光板は、粘着剤層１／基材１／配向膜／偏光子／保護層／粘着剤層３／（λ／４層）／粘着剤層３／ポジティブＣ層／粘着剤層１からなる。 The base film used for forming the retardation layer 1 was peeled off from the retardation layer described above. The exposed λ / 4 layer and the pressure-sensitive adhesive layer 3 were bonded together. The angle formed by the absorption axis of the polarizer and the slow axis of the λ / 4 layer was 45 °. Next, the base film used for forming the retardation layer 2 was peeled off to expose the positive C layer. Then, a film provided with another pressure-sensitive adhesive layer 1 was prepared, and one of the polyethylene terephthalate films was peeled off to expose the surface of the pressure-sensitive adhesive layer 1. After corona treatment was applied to the surface of the exposed positive C layer and the surface of the pressure-sensitive adhesive layer 1, both were bonded together. Then, the other polyethylene terephthalate film was peeled off from the pressure-sensitive adhesive layer 1. In this way, the front plate 1 / adhesive layer 1 / base material 1 / alignment film / polarizer / protective layer / adhesive layer 3 / (λ / 4 layer) / adhesive layer 3 / positive C layer / adhesive A laminate of Example 1 having a layer 1 structure was obtained. The results are shown in Table 2. In Example 1, the circular polarizing plate with the double-sided pressure-sensitive adhesive layer is the pressure-sensitive adhesive layer 1 / base material 1 / alignment film / polarizer / protective layer / pressure-sensitive adhesive layer 3 / (λ / 4 layer) / pressure-sensitive adhesive layer 3 /. It consists of a positive C layer / adhesive layer 1.
　＜実施例２＞
　実施例１において前面板１を用いたことに代えて前面板２を用いたこと以外は、実施例１と同様にして、実施例２の積層体を得た。結果を表２示す。 <Example 2>
A laminate of Example 2 was obtained in the same manner as in Example 1 except that the front plate 2 was used instead of the front plate 1 in Example 1. The results are shown in Table 2.
　＜実施例３＞
　実施例１において前面板１を用いたことに代えて前面板３を用いたこと以外は、実施例１と同様にして、実施例３の積層体を得た。結果を表２示す。 <Example 3>
A laminate of Example 3 was obtained in the same manner as in Example 1 except that the front plate 3 was used instead of the front plate 1 in Example 1. The results are shown in Table 2.
　＜実施例４＞
　実施例１において、基材１を準備し、基材１上に配向膜形成用組成物を塗布したことに代えて、基材２を準備し、基材２のＨＣ層２上に配向膜形成用組成物を塗布したこと、及び粘着剤層１を備えるフィルムを用いたことに代えて粘着剤層２を備えるフィルムを用いたこと以外は、実施例１と同様にして、実施例４の積層体を得た。結果を表２示す。 <Example 4>
In Example 1, instead of preparing the base material 1 and applying the alignment film forming composition on the base material 1, the base material 2 is prepared and the alignment film is formed on the HC layer 2 of the base material 2. Lamination of Example 4 in the same manner as in Example 1 except that the composition for use was applied and the film provided with the pressure-sensitive adhesive layer 2 was used instead of the film provided with the pressure-sensitive adhesive layer 1. I got a body. The results are shown in Table 2.
　＜比較例１＞
　実施例４において、前面板１を用いたことに代えて前面板４を用いたこと以外は、実施例４と同様にして比較例１の積層体を作製した。結果を表２示す。 <Comparative example 1>
A laminate of Comparative Example 1 was produced in the same manner as in Example 4 except that the front plate 4 was used instead of the front plate 1 in Example 4. The results are shown in Table 2.
Figure JPOXMLDOC01-appb-T000010
Figure JPOXMLDOC01-appb-T000010
　１０　前面板、２０　両面粘着剤層付円偏光板、３０　第１粘着剤層、４０　直線偏光板、４１　基材、４２　配向膜、４３　偏光子、４４　保護層、５０　貼合層、６０　位相差層、６１　λ／４層、６２　貼合層、６３　ポジティブＣ層、７０　第２粘着剤層、１００，２００　積層体。 10 Front plate, 20 Circular polarizing plate with double-sided pressure-sensitive adhesive layer, 30 First pressure-sensitive adhesive layer, 40 Linear polarizing plate, 41 Base material, 42 Alignment film, 43 Polarizer, 44 Protective layer, 50 Laminated layer, 60 Phase difference Layer, 61 λ / 4 layer, 62 laminating layer, 63 positive C layer, 70 second adhesive layer, 100, 200 laminate.

Claims (6)

  1. 　前面板と、両面粘着剤層付円偏光板とを備え、前記前面板の厚みをａ[μｍ]とし、前記両面粘着剤層付円偏光板の厚みをｂ[μｍ]とし、前記前面板の温度６０℃及び相対湿度９０％ＲＨでの引張弾性率をｃ［ＭＰａ］としたとき、下記式（１）を満たす、積層体。
    　［（ｂ／ａ）×ｃ］≧２２００　　　　　（１）     A front plate and a circular polarizing plate with a double-sided pressure-sensitive adhesive layer are provided, and the thickness of the front plate is a [μm] and the thickness of the circular polarizing plate with a double-sided pressure-sensitive adhesive layer is b [μm]. A laminate that satisfies the following formula (1) when the tensile elastic modulus at a temperature of 60 ° C. and a relative humidity of 90% RH is c [MPa].
    [(B / a) × c] ≧ 2200 (1)
  2. 　前記ａ及び前記ｃは、下記式（２）を満たす、請求項１に記載の積層体。
    　ａ／ｃ≦０．０３　　　　　　　　　　　（２）     The laminate according to claim 1, wherein the a and c satisfy the following formula (2).
    a / c ≤ 0.03 (2)
  3. 　前記前面板はハードコート層を有する、請求項１又は２に記載の積層体。 The laminate according to claim 1 or 2, wherein the front plate has a hard coat layer.
  4. 　前記両面粘着剤層付円偏光板は、第１粘着剤層と、直線偏光板と、位相差層と、第２粘着剤層とをこの順に含む、請求項１～３のいずれか一項に記載の積層体。 The circular polarizing plate with a double-sided pressure-sensitive adhesive layer includes a first pressure-sensitive adhesive layer, a linear polarizing plate, a retardation layer, and a second pressure-sensitive adhesive layer in this order, according to any one of claims 1 to 3. The laminate described.
  5. 　前記直線偏光板は、ハードコート層を少なくとも一方の表面に有する熱可塑性樹脂フィルムを含む、請求項４に記載の積層体。 The laminate according to claim 4, wherein the linear polarizing plate includes a thermoplastic resin film having a hard coat layer on at least one surface.
  6. 　請求項１～５のいずれか一項に記載の積層体を備える、画像表示装置。 An image display device comprising the laminate according to any one of claims 1 to 5.
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5050961A (en) * 1989-09-05 1991-09-24 Apple Computer, Inc. Polarized mask stereoscopic display including tiling masks with complementary transparent regions
JP2017083857A (en) * 2016-12-02 2017-05-18 住友化学株式会社 Front plate integrated liquid crystal display panel
JP2018027995A (en) * 2016-08-15 2018-02-22 日東電工株式会社 Adhesive composition for flexible image display device, adhesive layer for flexible image display device, laminate for flexible image display device, and flexible image display device
JP2018056069A (en) * 2016-09-30 2018-04-05 日東電工株式会社 Organic EL display device
JP2018203986A (en) * 2017-06-05 2018-12-27 住友化学株式会社 Film, evaluation method for optical homogeneity of film, and production method of film

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004086328A (en) * 2002-08-23 2004-03-18 Fuji Photo Film Co Ltd Touch panel, its manufacturing method, and display device with touch panel
JP6123563B2 (en) * 2012-08-31 2017-05-10 住友化学株式会社 Circularly polarizing plate and display device
KR102248677B1 (en) 2014-12-08 2021-05-06 엘지디스플레이 주식회사 Foldable display device
KR101998151B1 (en) * 2015-07-21 2019-07-09 후지필름 가부시키가이샤 Liquid crystal panel and liquid crystal display device
JP6932421B2 (en) * 2016-08-15 2021-09-08 日東電工株式会社 Adhesive layer for flexible image display device, laminate for flexible image display device, and flexible image display device
JP6974962B2 (en) * 2017-05-26 2021-12-01 エルジー ディスプレイ カンパニー リミテッド Electro-optic panel

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5050961A (en) * 1989-09-05 1991-09-24 Apple Computer, Inc. Polarized mask stereoscopic display including tiling masks with complementary transparent regions
JP2018027995A (en) * 2016-08-15 2018-02-22 日東電工株式会社 Adhesive composition for flexible image display device, adhesive layer for flexible image display device, laminate for flexible image display device, and flexible image display device
JP2018056069A (en) * 2016-09-30 2018-04-05 日東電工株式会社 Organic EL display device
JP2017083857A (en) * 2016-12-02 2017-05-18 住友化学株式会社 Front plate integrated liquid crystal display panel
JP2018203986A (en) * 2017-06-05 2018-12-27 住友化学株式会社 Film, evaluation method for optical homogeneity of film, and production method of film

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