WO2020195630A1 - 積層体及び画像表示装置 - Google Patents

積層体及び画像表示装置 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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WIPO (PCT)
Prior art keywords
layer
sensitive adhesive
film
adhesive layer
pressure
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PCT/JP2020/009086
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English (en)
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 CN202080021493.0A priority Critical patent/CN113574423B/zh
Priority to KR1020217017187A priority patent/KR102381953B1/ko
Publication of WO2020195630A1 publication Critical patent/WO2020195630A1/ja

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3083—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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