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WO2020080055A1 - Stratifié optique et dispositif d'affichage - Google Patents

Stratifié optique et dispositif d'affichage Download PDF

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Publication number
WO2020080055A1
WO2020080055A1 PCT/JP2019/037782 JP2019037782W WO2020080055A1 WO 2020080055 A1 WO2020080055 A1 WO 2020080055A1 JP 2019037782 W JP2019037782 W JP 2019037782W WO 2020080055 A1 WO2020080055 A1 WO 2020080055A1
Authority
WO
WIPO (PCT)
Prior art keywords
adhesive layer
pressure
sensitive adhesive
layer
film
Prior art date
Application number
PCT/JP2019/037782
Other languages
English (en)
Japanese (ja)
Inventor
大山 姜
昇祐 李
東輝 金
Original Assignee
住友化学株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2019072582A external-priority patent/JP2020064271A/ja
Application filed by 住友化学株式会社 filed Critical 住友化学株式会社
Priority to KR1020217009067A priority Critical patent/KR20210077669A/ko
Priority to CN201980067157.7A priority patent/CN112839806A/zh
Publication of WO2020080055A1 publication Critical patent/WO2020080055A1/fr

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Classifications

    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • 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
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • C09J7/38—Pressure-sensitive adhesives [PSA]
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements

Definitions

  • the present invention relates to an optical laminate and a display device.
  • Patent Document 1 describes a foldable display device in which a display panel, a polarizing member provided on the display panel, and a window provided on the polarizing member are adhered by adhesive members.
  • Patent Document 2 describes a double-sided pressure-sensitive adhesive sheet having a first pressure-sensitive adhesive layer and a second pressure-sensitive adhesive layer for bonding a display device and an optical member together.
  • Patent Document 3 describes a pressure-sensitive adhesive sheet having a first pressure-sensitive adhesive layer and a second pressure-sensitive adhesive layer arranged between a protective panel and a polarizing film.
  • a bendable optical laminate in which a front plate and a back plate are laminated via an adhesive layer, and a colored layer is partially formed on the adhesive layer side of the front plate or the back plate has a size of 10 ⁇ m or more between the layers. Bubbles having a certain size may be mixed.
  • the present invention is a bendable optical laminate in which a front plate and a back plate are laminated via a pressure-sensitive adhesive layer, and a colored layer is partially formed on the pressure-sensitive adhesive layer side of the front plate or the back plate, It is an object of the present invention to provide an optical layered body in which the inclusion of bubbles having a size of 10 ⁇ m or more between layers is suppressed.
  • the present invention provides the following laminated body and display device.
  • a front plate, a pressure-sensitive adhesive layer, and a back plate which are laminated in this order, and are partially formed on either the pressure-sensitive adhesive layer side of the front plate or the pressure-sensitive adhesive layer side of the back plate.
  • a laminate having layers The pressure-sensitive adhesive layer includes a first pressure-sensitive adhesive layer and a second pressure-sensitive adhesive layer, and the second pressure-sensitive adhesive layer is laminated so as to be on the colored layer side, The pressure-sensitive adhesive layer is arranged so as to cover at least an end portion inside the colored layer in a plan view of the optical laminate,
  • the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer include a (meth) acrylic resin, An optical laminate satisfying the following (1) and (2).
  • a display device including the optical layered body according to any one of [1] to [4].
  • a bendable optical laminate in which a front plate and a back plate are laminated via an adhesive layer, and a colored layer is partially formed on the adhesive layer side of the front plate or the back plate.
  • FIG. 1 is a schematic sectional view of an optical laminate according to an embodiment of the present invention.
  • the optical layered body 100 (hereinafter, also abbreviated as “layered body”) 100 shown in FIG. 1 has a front plate 10, a pressure-sensitive adhesive layer 20, and a back plate 30 laminated in this order.
  • the laminated body 100 further includes a colored layer 40 that is partially formed on the adhesive layer 20 side of the back plate 30.
  • the pressure-sensitive adhesive layer 20 includes a first pressure-sensitive adhesive layer 21 and a second pressure-sensitive adhesive layer 22, and the second pressure-sensitive adhesive layer 22 is laminated so as to be on the colored layer side.
  • the colored layer 40 may be partially formed on the adhesive layer 20 side of the front plate 10 instead of being partially formed on the adhesive layer 20 side of the back plate 30.
  • the laminated body 100 can be bent.
  • the term “bendable” means that it can be bent with a radius of curvature of 3 mm.
  • the laminate 100 preferably has no cracks even when the inner surface of the laminate 100 has a curvature radius of 3 mm and the number of bends is 10,000.
  • the thickness of the laminated body 100 is not particularly limited because it varies depending on the function required for the laminated body and the application of the laminated body, but is, for example, 50 ⁇ m or more and 1,000 ⁇ m or less, preferably 100 ⁇ m or more and 500 ⁇ m or less.
  • the planar view shape of the laminated body 100 may be, for example, a rectangular shape, preferably a rectangular shape having long sides and short sides, and more preferably a rectangle.
  • the length of the long side may be, for example, 10 mm or more and 1400 mm or less, and 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.
  • the lengths of the sides of the front plate 10 and the back plate 30 may be the same, and the positions of the end portions of the front plate 10 and the back plate 30 are the same. Preferably there is.
  • the positions of the ends of the pressure-sensitive adhesive layer 20 may be the same as the positions of the ends of the front plate 10 or the back plate 30, or may be inside. .
  • 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 display device may have a touch panel function.
  • the laminated body 100 is suitable for a display device having flexibility.
  • a flexible optical laminate in which a colored layer is partially formed on the surface of the front plate or the back plate on the side of the pressure-sensitive adhesive has a flexibility between the colored layer and the pressure-sensitive adhesive layer or between the first pressure-sensitive adhesive layer and the first pressure-sensitive adhesive layer.
  • bubbles having a length of 10 ⁇ m or more hereinafter, also referred to as specific bubbles
  • the present inventor has conducted extensive research on suppression of bubbles, and as a result, a step is formed in the thickness direction of the laminate between the region where the colored layer is present and the region where the colored layer is not present, and the adhesive formed on the step.
  • the agent layer cannot follow the step, and bubbles are likely to occur between the adhesive layer and the front plate or the back plate on which the colored layer is formed, particularly in the step between the front plate or the back plate and the colored layer. stopped. Therefore, when further research was conducted focusing on the pressure-sensitive adhesive layer, the pressure-sensitive adhesive layer was made to have a two-layer structure, and the loss tangent (hereinafter also referred to as tan ⁇ ) of the layer in contact with the colored layer was set within a specific range. It has been found that each adhesive layer contains an acrylic resin and exhibits a specific storage elastic modulus, whereby bubbles can be suppressed without impairing the flexibility.
  • the specific bubbles can be observed by observing the transmission image of the laminate with an optical microscope.
  • the specific bubbles are often generated in parallel with the end portion inside the colored layer in the plane direction of the laminate. Therefore, the shape of the specific bubble is often linear.
  • the length may be 10 ⁇ m or more and the width may be, for example, 0.01 ⁇ m or more and 5 ⁇ m or less.
  • specific bubbles are generated, they are often generated both between the colored layer and the pressure-sensitive adhesive layer and between the front plate or the back plate and the pressure-sensitive adhesive layer.
  • the reference it often occurs at a position with the reference as the axis of symmetry.
  • the front plate 10 is not limited in material and thickness as long as it is a plate that can transmit light, and may be composed of only one layer or may be composed of two or more layers. Examples thereof include a resin plate-shaped body (for example, a resin plate, a resin sheet, a resin film, etc.) and a glass plate-shaped body (for example, a glass plate, a glass film, etc.).
  • the front plate can be a layer forming the outermost surface of the display device.
  • the thickness of the front plate 10 may be, for example, 30 ⁇ m or more and 2,000 ⁇ m or less, preferably 50 ⁇ m or more and 1,000 ⁇ m or less, and more preferably 50 ⁇ m or more and 500 ⁇ m or less.
  • the thickness of each layer can be measured according to the thickness measuring method described in Examples below.
  • the resin plate is not limited as long as it can transmit light.
  • the resin include triacetyl cellulose, acetyl cellulose butyrate, ethylene-vinyl acetate copolymer, propionyl cellulose, butyryl cellulose, acetyl propionyl cellulose, polyester, polystyrene, polyamide, polyetherimide, poly (meth) acryl, polyimide , Polyethersulfone, polysulfone, polyethylene, polypropylene, polymethylpentene, polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol, polyvinyl acetal, polyether ketone, polyether ether ketone, polyether sulfone, polymethyl methacrylate, polyethylene terephthalate, Polymers such as polybutylene terephthalate, polyethylene naphthalate, polycarbonate, polyamide-imide Formed film.
  • a resin film formed of a polymer such as polyimide, polyamide, or polyamide-imide is preferable.
  • the thickness of the resin plate may be, for example, 30 ⁇ m or more and 2,000 ⁇ m or less, preferably 50 ⁇ m or more and 1,000 ⁇ m or less, more preferably 50 ⁇ m or more and 500 ⁇ m or less, and may be 100 ⁇ m or less. .
  • the front plate 10 may be a film in which a hard coat layer is provided on at least one surface of the base film to further improve hardness.
  • a film made of the above resin can be used as the substrate film.
  • 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, it is possible to obtain a resin film having improved hardness and scratch resistance.
  • the hard coat layer is, for example, a cured layer of an ultraviolet curable resin. Examples of the ultraviolet curable resin include acrylic resin, silicone resin, polyester resin, urethane resin, amide resin, and epoxy resin.
  • the hard coat layer may contain an additive in order to improve the strength.
  • the additive is not limited and includes inorganic fine particles, organic fine particles, or a mixture thereof.
  • the front plate 10 is a glass plate
  • tempered glass for display is preferably used as the glass plate.
  • the thickness of the glass plate may be, for example, 10 ⁇ m or more and 1,000 ⁇ m or less.
  • the front plate 10 may have a function as a window film in the display device.
  • the front plate 10 may have a function as a touch sensor, a blue light cut function, a viewing angle adjustment function, and the like.
  • the pressure-sensitive adhesive layer 20 may be a layer that is interposed between the front plate 10 and the back plate 30 to bond them.
  • the adhesive layer 20 includes a first adhesive layer 21 and a second adhesive layer 22.
  • the first adhesive layer 21 and the second adhesive layer 22 may have different adhesive compositions.
  • the adhesive layer 20 may be, for example, a laminate in which a first adhesive layer 21 and a second adhesive layer 22 are laminated, and the first adhesive layer 21 and the second adhesive layer 22 are laminated in contact with each other. May be done.
  • the pressure-sensitive adhesive layer 20 is laminated on the front plate 10 or the rear plate 30 so that the second pressure-sensitive adhesive layer 22 is on the colored layer 40 side.
  • the pressure-sensitive adhesive layer 20 may be laminated such that the second pressure-sensitive adhesive layer 22 is closer to the colored layer 40 than the first pressure-sensitive adhesive layer 21, or may be laminated so as to be in contact with the colored layer 40.
  • the pressure-sensitive adhesive layer 20 is laminated so as to cover at least an end portion inside the colored layer 40 in a plan view of the optical laminate 100.
  • the step due to the colored layer 40 is absorbed by the pressure-sensitive adhesive layer 20 including the first pressure-sensitive adhesive 21 having a specific storage elastic modulus and the second pressure-sensitive adhesive layer 22 having a specific elastic modulus and loss tangent, and thus the adhesiveness is increased.
  • the surface of the agent layer tends to be smooth, and mixing of specific bubbles tends to be suppressed easily.
  • the pressure-sensitive adhesive layer 20 preferably covers the entire colored layer 40 and the entire portion of the front plate 10 or the rear plate 30 where the colored portion is not formed in plan view of the optical laminate 100. It is stacked.
  • the plan view means viewing from the thickness direction of the layer.
  • the first pressure-sensitive adhesive layer 21 may be attached to one of the front plate 10 or the rear plate 30 on which the colored layer 40 is not formed.
  • the first pressure-sensitive adhesive layer 21 contains a (meth) acrylic resin.
  • the storage elastic modulus of the first adhesive layer 21 is 0.01 MPa or more and 0.1 MPa or less, and preferably 0.02 MPa or more and 0.08 MPa or less.
  • the storage elastic modulus of the first pressure-sensitive adhesive layer 21 is 0.01 MPa or more and 0.1 MPa or less, the laminate 100 tends to have excellent flexibility.
  • the storage elastic modulus can be measured according to the measuring method described in the section of Examples below. As the storage elastic modulus, a value at room temperature (temperature 23 ° C.) can be adopted.
  • the storage elastic modulus of the first pressure-sensitive adhesive layer 21 is determined by selecting the material forming the first pressure-sensitive adhesive layer 21, the thickness of the first pressure-sensitive adhesive layer 21, the manufacturing conditions of the first pressure-sensitive adhesive layer 21, such as the first pressure-sensitive adhesive.
  • the layer 21 is composed of an active energy ray-curable pressure-sensitive adhesive composition, it can be adjusted by UV irradiation amount and the like, and a combination thereof.
  • the storage elastic modulus of the first pressure-sensitive adhesive layer 21 tends to increase when a monomer having a relatively large molecular weight is used for producing the (meth) acrylic resin contained in the pressure-sensitive adhesive composition 1 described later. Further, for example, when the UV irradiation amount is increased, the storage elastic modulus of the first pressure-sensitive adhesive layer 21 tends to increase.
  • the loss tangent of the first pressure-sensitive adhesive layer 21 is, for example, 0.7 or less, preferably less than 0.5, and more preferably 0.3 or less.
  • the first pressure-sensitive adhesive layer 21 can be formed from a pressure-sensitive adhesive composition containing a (meth) acrylic resin as a main component (hereinafter, also referred to as pressure-sensitive adhesive composition 1).
  • a pressure-sensitive adhesive composition containing a (meth) acrylic resin as a main component hereinafter, also referred to as pressure-sensitive adhesive composition 1.
  • (meth) acrylic resin means at least one selected from the group consisting of acrylic resins and methacrylic resins. The same applies to other terms with "(meta)”.
  • the pressure-sensitive adhesive composition 1 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 1 include butyl (meth) acrylate, ethyl (meth) acrylate, hexyl (meth) acrylate, and octyl (meth) acrylate.
  • One of (meth) acrylic acid ester such as lauryl (meth) acrylate, isooctyl (meth) acrylate, isodecyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, isobornyl (meth) acrylate or Polymers or copolymers having two or more monomers as monomers are preferably used.
  • polar monomers include (meth) acrylic acid, (meth) acrylic acid 4-hydroxybutyl acrylate, (meth) acrylic acid 2-hydroxypropyl, (meth) acrylic acid hydroxyethyl, (meth) acrylamide, N, N
  • polar monomers include monomers having a carboxyl group, a hydroxyl group, an amide group, an amino group, an epoxy group, and the like, such as dimethylaminoethyl (meth) acrylate and glycidyl (meth) acrylate.
  • the pressure-sensitive adhesive composition 1 may contain only the above base polymer, but usually further contains a crosslinking agent.
  • a cross-linking agent a metal ion having a valence of 2 or more and forming a carboxylic acid metal salt with a carboxyl group; a polyamine compound forming an amide bond with a carboxyl group; Examples thereof include epoxy compounds and polyols that form an ester bond with a carboxyl group; and polyisocyanate compounds that form an amide bond with a carboxyl group. 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 an active energy ray such as an ultraviolet ray or an electron beam, and has adhesiveness even before irradiation with the active energy ray. It is a pressure-sensitive adhesive composition having a property that it can be brought into close contact with an adherend such as the above, and can be cured by irradiation with an active energy ray to adjust the adhesion.
  • the active energy ray-curable pressure-sensitive adhesive composition is preferably UV-curable.
  • 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 crosslinking agent. Further, if necessary, a photopolymerization initiator, a photosensitizer or the like may be contained.
  • the pressure-sensitive adhesive composition 1 includes fine particles for imparting light-scattering property, beads (resin beads, glass beads, etc.), glass fibers, resins other than base polymers, tackifiers, fillers (metal powder and other inorganic materials). Powder, etc.), antioxidants, ultraviolet absorbers, dyes, pigments, colorants, defoamers, corrosion inhibitors, photopolymerization initiators, and other additives.
  • the formed pressure-sensitive adhesive layer can be irradiated with an active energy ray to give a cured product having a desired degree of curing.
  • the thickness of the first pressure-sensitive adhesive layer 21 is preferably thin from the viewpoint of conformability and flexibility, and is preferably, for example, 3 ⁇ m or more and 100 ⁇ m or less, more preferably 5 ⁇ m or more and 50 ⁇ m or less, and 20 ⁇ m or more. Good.
  • the second pressure-sensitive adhesive layer 22 can be attached to either the front plate 10 or the rear plate 30 on which the colored layer 40 is formed.
  • the second pressure-sensitive adhesive layer 22 contains a (meth) acrylic resin.
  • the loss tangent of the second pressure-sensitive adhesive layer 22 is 0.5 or more and 0.8 or less, preferably 0.55 or more and 0.75 or less.
  • the loss tangent can be measured according to the measuring method described in the section of Examples below. As the loss tangent, a value at room temperature (temperature 23 ° C) can be adopted.
  • the loss tangent of the second pressure-sensitive adhesive layer 22 should be adjusted by selecting the material for forming the second pressure-sensitive adhesive layer 22, the thickness of the second pressure-sensitive adhesive layer 22, the combination of the manufacturing conditions of the second pressure-sensitive adhesive layer 22, and the like. You can For example, the loss tangent of the second pressure-sensitive adhesive layer 22 tends to increase when a monomer having a relatively large molecular weight is used for producing the (meth) acrylic resin contained in the pressure-sensitive adhesive composition 2 described later.
  • the storage elastic modulus of the second pressure-sensitive adhesive layer 22 is 0.01 MPa or more and 0.1 MPa or less, and preferably 0.02 MPa or more and 0.08 MPa or less.
  • the laminate 100 tends to have excellent flexibility.
  • the method of adjusting the storage elastic modulus of the second pressure-sensitive adhesive layer 22 is the same as the method exemplified in the above description of the first pressure-sensitive adhesive layer 21.
  • the second pressure-sensitive adhesive layer 22 can be formed from a pressure-sensitive adhesive composition (hereinafter, also referred to as pressure-sensitive adhesive composition 2).
  • the pressure-sensitive adhesive composition 2 can be formed from the pressure-sensitive adhesive composition containing the above-mentioned (meth) acrylic resin as a main component. From the viewpoint of loss tangent, the pressure-sensitive adhesive composition 2 is preferably an active energy ray-curable type.
  • the (meth) acrylic resin (base polymer), the cross-linking agent, the photopolymerization initiator, the additives and the like contained in the pressure-sensitive adhesive composition 2 are the same as those exemplified in the description of the pressure-sensitive adhesive composition 1.
  • the method for forming the second adhesive layer may be the same as the method for forming the first adhesive layer.
  • the thickness of the second pressure-sensitive adhesive layer 22 is preferably larger than the thickness of the colored layer 40 from the viewpoint of absorbing the step difference of the colored layer 40, for example, preferably 3 ⁇ m or more and 100 ⁇ m or less, and 5 ⁇ m or more and 50 ⁇ m or less. More preferably, it may be 20 ⁇ m or more.
  • the total thickness of the first adhesive layer 21 and the second adhesive layer 22 may be, for example, 25 ⁇ m or more and 150 ⁇ m or less, preferably 30 ⁇ m or more and 125 ⁇ m or less, and more preferably 40 ⁇ m or more and 100 ⁇ m or less. When the total thickness is within the above range, good step followability and bending resistance tend to be easily obtained.
  • the loss tangent of the first pressure-sensitive adhesive layer 21 may be different from the loss tangent of the second pressure-sensitive adhesive layer 22, for example, and is preferably smaller than the loss tangent of the second pressure-sensitive adhesive layer 22.
  • the absolute value of the difference may be, for example, 0.05 or more, and preferably 0.25 or more and 0.5 or less. .
  • the compression elastic modulus of the first pressure-sensitive adhesive layer may be, for example, 3 MPa or more and 12 MPa or less.
  • the compressive elastic modulus of the first pressure-sensitive adhesive layer is 3 MPa or more, the first pressure-sensitive adhesive layer tends to be hardly peeled off from the adherend during bending.
  • the compressive elastic modulus of the first pressure-sensitive adhesive layer is 12 MPa or less, cracks tend not to easily occur on the front plate and the back plate during bending.
  • the compression modulus of the first pressure-sensitive adhesive layer is preferably 3 MPa or more and 10 MPa or less from the viewpoint of suppressing the peeling and cracking.
  • the compressive elastic modulus of the second pressure-sensitive adhesive layer may be, for example, 3 MPa or more and 5 MPa or less. When the compression elastic modulus of the second pressure-sensitive adhesive layer is within the above range, the step-following property of the second pressure-sensitive adhesive layer tends to be excellent.
  • Back plate As the back plate 30, it is possible to use a plate-like body capable of transmitting light, components used in a normal display device, and the like.
  • the thickness of the back plate 30 may be, for example, 5 ⁇ m or more and 2,000 ⁇ m or less, preferably 10 ⁇ m or more and 1,000 ⁇ m or less, and more preferably 15 ⁇ m or more and 500 ⁇ m or less.
  • the plate-shaped body used for the back plate 30 may be composed of only one layer, or may be composed of two or more layers, and the plate-shaped body described for the back plate 10 may be used. it can.
  • the components used in the normal display device used for the back plate 30 include, for example, a polarizing plate, a touch sensor panel, a retardation film, and the like.
  • the polarizing plate examples include a stretched film having a dye having absorption anisotropy adsorbed thereon, or a film containing a film obtained by coating and curing a dye having absorption anisotropy as a polarizer.
  • the dye having absorption anisotropy examples include dichroic dyes.
  • the dichroic pigment specifically, iodine or a dichroic organic dye is used.
  • the dichroic organic dye includes C.I. I.
  • a dichroic direct dye composed of a disazo compound such as DIRECT RED 39 and a dichroic direct dye composed of a compound such as trisazo and tetrakisazo are included.
  • the film coated with a dye having absorption anisotropy which is used as a polarizer, is a stretched film on which a dye having absorption anisotropy is adsorbed, or a composition or a dichroic dye containing liquid crystallinity.
  • a film having a layer obtained by applying a composition containing a colorant and a polymerizable liquid crystal and curing the composition examples thereof include a film having a layer obtained by applying a composition containing a colorant and a polymerizable liquid crystal and curing the composition.
  • a film coated with a dye having absorption anisotropy and cured is preferable because it has no limitation in the bending direction as compared with a stretched film to which a dye having absorption anisotropy is adsorbed.
  • the stretched film which is a polarizer and has a dye having absorption anisotropy adsorbed, is usually a step of uniaxially stretching a polyvinyl alcohol-based resin film, by staining the polyvinyl alcohol-based resin film with a dichroic dye, It is manufactured through a step of adsorbing a dichroic dye, a step of treating the polyvinyl alcohol-based resin film on which the dichroic pigment is adsorbed with a boric acid aqueous solution, and a step of washing with water after the treatment with the boric acid aqueous solution.
  • Such a polarizer may be used as it is as a polarizing plate, or one having a transparent protective film laminated on one side or both sides may be used as a polarizing plate.
  • the thickness of the thus obtained polarizer is preferably 2 ⁇ m or more and 40 ⁇ m or less.
  • Polyvinyl alcohol resin is obtained by saponifying polyvinyl acetate resin.
  • polyvinyl acetate 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.
  • the other monomer copolymerizable with vinyl acetate include unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, and acrylamides having an ammonium group.
  • the saponification degree of the polyvinyl alcohol resin is usually 85 mol% or more and 100 mol% or less, and 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 polymerization degree of the polyvinyl alcohol-based resin is usually about 1,000 or more and 10,000 or less, preferably 1,500 or more and 5,000 or less.
  • a film produced from such a polyvinyl alcohol resin is used as a raw film for polarizing plates.
  • the method for forming the polyvinyl alcohol-based resin into a film is not particularly limited, and the film can be formed by a known method.
  • the film thickness of the polyvinyl alcohol-based raw film can be, for example, about 10 ⁇ m or more and 150 ⁇ m or less.
  • Uniaxial stretching of the polyvinyl alcohol-based resin film can be performed before dyeing with the dichroic dye, simultaneously with dyeing, or after dyeing.
  • the uniaxial stretching may be performed before the boric acid treatment or during the boric acid treatment. It is also possible to carry out uniaxial stretching in these plural stages.
  • stretching may be performed uniaxially between rolls having different peripheral speeds, or uniaxial stretching may be performed using a heat roll.
  • the uniaxial stretching may be dry stretching in which the stretching is performed in the air, or wet stretching in which the polyvinyl alcohol resin film is swollen with a solvent.
  • the draw ratio is usually about 3 to 8 times.
  • the thickness of a polarizing plate provided with a stretched film as a polarizer may be, for example, 1 ⁇ m or more and 400 ⁇ m or less, or may be 5 ⁇ m or more and 100 ⁇ m or less.
  • the material of the protective film to be attached to one side or both sides of the polarizer is not particularly limited, for example, cyclic polyolefin resin film, triacetyl cellulose, cellulose acetate-based resin consisting of diacetyl cellulose.
  • Films known in the art such as resin films, polyester resin films made of resins such as polyethylene terephthalate, polyethylene naphthalate, and polybutylene terephthalate, polycarbonate resin films, (meth) acrylic resin films, polypropylene resin films, etc. Can be mentioned.
  • the thickness of the protective film is usually 300 ⁇ m or less, preferably 200 ⁇ m or less, more preferably 100 ⁇ m or less, and usually 5 ⁇ m or more, preferably 20 ⁇ m or more.
  • the protective film may or may not have a retardation.
  • Polarizing Plate having a film formed from liquid crystal layer as a polarizer will be described.
  • a film coated with a dye having absorption anisotropy which is used as a polarizer
  • a composition containing a dichroic dye having liquid crystallinity or a composition containing a dichroic dye and a liquid crystal compound is used as a base material.
  • Examples thereof include films obtained by applying and curing.
  • the film may be used as a polarizing plate by peeling the base material or together with the base material, or may be used as a polarizing plate with a structure having a protective film on one side or both sides thereof.
  • the protective film may be the same as the polarizing plate including the above-mentioned stretched film as a polarizer.
  • the film obtained by applying and curing a dye having absorption anisotropy is thin, but if it is too thin, the strength tends to decrease and the processability tends to deteriorate.
  • 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.
  • Specific examples of the film obtained by applying the dye having the absorption anisotropy include those described in JP 2012-33249 A and the like.
  • the thickness of a polarizing plate provided with a film formed of a liquid crystal layer as a polarizer may be, for example, 1 ⁇ m or more and 50 ⁇ m or less.
  • a circular polarizing plate can be obtained by laminating a retardation film described later (for example, a retardation film including a ⁇ / 4 plate as a retardation layer) on a polarizing plate. At this time, the angle formed by the absorption axis of the polarizer and the slow axis of the ⁇ / 4 plate can be 45 ° ⁇ 10 °.
  • a retardation film described later for example, a retardation film including a ⁇ / 4 plate as a retardation layer
  • the touch sensor panel is not limited in detection method as long as it is a sensor that can detect a touched position, and includes a resistive film method, a capacitive coupling method, an optical sensor method, an ultrasonic method, and an electromagnetic induction coupling.
  • Examples of the touch sensor panel include a touch panel and a surface acoustic wave type touch sensor panel.
  • a resistance film type or a capacitive coupling type touch sensor panel is preferably used because of its low cost.
  • An example of a resistive film type touch sensor panel is a pair of substrates arranged to face each other, an insulating spacer sandwiched between the pair of substrates, and a transparent film provided as a resistive film on the inner front surface of each substrate. It is composed of a conductive film and a touch position detection circuit.
  • a resistive film type touch sensor panel when the surface of the front plate 10 is touched, the opposing resistive films are short-circuited and a current flows through the resistive film.
  • the touch position detection circuit detects the change in voltage at this time, and the touched position is detected.
  • An example of a capacitive coupling type touch sensor panel is composed of a substrate, a position detection transparent electrode provided on the entire surface of the substrate, and a touch position detection circuit.
  • a capacitive coupling type touch sensor panel when the surface of front plate 10 is touched, the transparent electrode is grounded via the electrostatic capacitance of the human body at the touched point.
  • the touch position detection circuit detects the grounding of the transparent electrode and the touched position is detected.
  • the thickness of the touch sensor panel may be, for example, 5 ⁇ m or more and 2,000 ⁇ m or less, or may be 5 ⁇ m or more and 100 ⁇ m or less.
  • the retardation film may include one layer or two or more retardation layers.
  • the retardation layer may be a positive A plate such as a ⁇ / 4 plate or a ⁇ / 2 plate, and a positive C plate.
  • the retardation layer may be formed of the resin film exemplified as the material of the protective film described above, or may be formed of a layer in which a polymerizable liquid crystal compound is cured.
  • the retardation film may further include an alignment film and a base film.
  • the thickness of the retardation film may be, for example, 1 ⁇ m or more and 50 ⁇ m or less.
  • the coloring layer 40 When used for a display device, for example, the coloring layer 40 has a function of improving the visibility of the displayed image and the like and preventing the wiring and the like in the display device from being seen from the outside of the display device.
  • the colored layer 40 may have an optical density of 3 or more, and preferably 5.0 or more.
  • the shape and color of the colored layer 40 are not limited, and can be appropriately selected depending on, for example, the use and design of the display device using the laminate.
  • the coloring layer 40 contains a coloring agent.
  • the colored layer 40 may be composed of only one layer, or may be composed of two or more layers. When the colored layer 40 is composed of two or more layers, at least one layer of the two or more layers is a colorant-containing layer containing a colorant and the remaining layers contain a colorant, It may not contain a coloring agent. Examples of the color of the colorant include black, red, white, navy blue, silver and gold.
  • the colored layer 40 may have a colorant-containing layer having a high light-shielding property, a base layer for improving adhesion, or the like below the colorant-containing layer containing a colorant. Moreover, you may have a transparent protective layer which covers a coloring agent containing layer.
  • the colorant can be appropriately selected according to the desired color.
  • the colorant include inorganic pigments such as titanium dioxide, zinc white, carbon black such as acetylene black, iron black, rouge, chrome vermilion, ultramarine blue, cobalt blue, yellow lead, and titanium yellow; phthalocyanine blue, indance.
  • Organic pigments or dyes such as lenblue, isoindolinone yellow, benzidine yellow, quinacridone red, polyazo red, perylene red, aniline black; metal pigments composed of scale-like foil pieces such as aluminum and brass; titanium dioxide coated mica, basic carbonic acid
  • pearlescent pigments pearl pigments
  • the metal contained in the plating layer is also contained in the colorant.
  • Each layer of the colored layer 40 can be formed by a method such as a printing method, a coating method, or a plating method.
  • the colored layer 40 may be partially formed on the surface of the back plate 30 on the adhesive layer 20 side, or the colored layer 40 may be partially formed on the surface of the front plate 10 on the adhesive layer 20 side. It may have been done.
  • the colored layer 40 may be directly formed on the surface of the front plate 10 on the side of the pressure-sensitive adhesive layer 20 or on the surface of the back plate 30 on the side of the pressure-sensitive adhesive layer 20, or may be formed on another substrate. It may be transferred and formed on the surface of the front plate 10 on the side of the adhesive layer 20 or on the surface of the back plate 30 on the side of the adhesive layer 20.
  • the printing method include gravure printing, offset printing, screen printing, and transfer printing from a transfer sheet. Printing by the printing method may be repeated to obtain the colored layer 40 having a desired thickness.
  • the ink used in the printing method include an ink containing a colorant, a binder, a solvent, and any additive.
  • the colored layer 40 is preferably partially formed on the surface of the back plate 30 on the side of the second pressure-sensitive adhesive layer 22 from the viewpoint of reducing steps.
  • binder examples include chlorinated polyolefin (for example, chlorinated polyethylene and chlorinated polypropylene), polyester resin, urethane resin, acrylic resin, vinyl acetate resin, vinyl chloride-vinyl acetate copolymer, and cellulose resin. .
  • the binder resin may be used alone or in combination of two or more kinds.
  • the binder resin may be a thermopolymerizable resin or a photopolymerizable resin.
  • the colorant-containing layer is formed by a printing method, it is preferable to use an ink containing 50 parts by mass or more and 200 parts by mass or less of the colorant with respect to 100 parts by mass of the binder resin.
  • the plating method include known plating methods such as electrolytic plating, electroless plating, hot dip plating, chemical vapor deposition and physical vapor deposition.
  • the physical vapor deposition include an evaporation system including a method of heating and evaporating an evaporation source such as vacuum evaporation, molecular beam evaporation, and ion beam evaporation, and a sputtering system such as magnetron sputtering and ion beam sputtering. These methods can combine patterning as needed.
  • a layer formed by a plating method is called a plating layer.
  • the colored layer 40 is not limited to being provided on the entire peripheral portion, and may be provided only on a part of the peripheral portion according to a desired design or the like. It may be in the form.
  • the width thereof can be appropriately determined according to the size of the display area, the desired design, etc., for example, in the range of 1 mm or more and 20 mm or less. Preferably there is.
  • the thickness of the colored layer 40 may be, for example, 50 ⁇ m or less, preferably 30 ⁇ m or less, and more preferably 25 ⁇ m or less. When the thickness of the coloring layer 40 is within the above numerical range, bubbles tend to be easily suppressed at the interface with the pressure-sensitive adhesive layer.
  • the colored layer 40 may have a thickness of, for example, 0.1 ⁇ m or more, and preferably 3 ⁇ m or more. When the thickness of the colored layer 40 is 0.1 ⁇ m or more, the colored layer 40 is easily visually recognized, which contributes to the improvement of the design and also contributes to the improvement of the optical density.
  • FIG. 1 illustrates the case where the colored layer 40 has a uniform thickness and a rectangular cross-sectional shape
  • the colored layer 40 does not have to have a uniform thickness, and for example, the thickness decreases toward the inside.
  • the cross-sectional shape may be such that it has a tapered portion. By having the taper portion, it tends to be easy to suppress the entrapment of air that is likely to occur during stacking.
  • the numerical range described above as the thickness of the colored layer 40 is the maximum thickness of the colored layer 40.
  • a display device includes a stacked body 100.
  • the laminated body 100 can be arranged on the viewing side of the display device so that the front plate is on the outside.
  • 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 display device may have a touch panel function.
  • the laminated body 100 is suitable for a display device having flexibility.
  • the first embodiment of the method for manufacturing the laminated body 100 includes the following steps. 1) Step of partially forming the colored layer 40 on one surface of the back plate 30 (FIG. 2A) 2) A step of preparing the second pressure-sensitive adhesive sheet 60 having the second pressure-sensitive adhesive layer 22 between the release film 61 and the release film 62 (FIG. 2B). 3) A step of peeling the release film 62 and bonding the second adhesive sheet 60 to the surface of the back plate 30 on the side of the colored layer 40 (FIG. 2C). 4) A step of preparing the first pressure-sensitive adhesive sheet 70 having the first pressure-sensitive adhesive layer 21 between the peeling films 71 and 72 (FIG. 2D).
  • the second embodiment of the method for manufacturing the laminated body 100 includes the following steps. 1) Step of partially forming the colored layer 40 on one surface of the back plate 30 (FIG. 3A) 2) A step of preparing the second pressure-sensitive adhesive sheet 60 having the second pressure-sensitive adhesive layer 22 between the release film 61 and the release film 62 (FIG. 3B). 3) A step of peeling the release film 62 and bonding the second adhesive sheet 60 to the surface of the back plate 30 on the side of the colored layer 40 (FIG. 3C). 4) A step of preparing the first pressure-sensitive adhesive sheet 70 having the first pressure-sensitive adhesive layer 21 between the release films 71 and 72 (FIG. 3D).
  • a corona treatment or a plasma treatment is performed on the bonding surface. Etc. can be processed.
  • the first pressure-sensitive adhesive sheet 70 and the second pressure-sensitive adhesive sheet 60 are prepared by, for example, 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 subjecting the liquid to a release treatment for release.
  • a layer made of a pressure-sensitive adhesive is formed in a sheet shape on the film 71 or 72 and the peeling film 61 or 62, and another peeling film 72 or 71 and the peeling film 62 or 61 are attached to the pressure-sensitive adhesive layer. It can be manufactured by a combination method or the like.
  • step 1) instead of partially forming the coloring layer 40 on one surface of the back plate 30, the coloring layer 40 is formed on the front plate 10. It can also be partially formed on one surface of the.
  • the laminate was cut with a laser cutter.
  • the cross section of the cut laminated body was observed using a transmission electron microscope (SU8010; Horiba, Ltd.), and the thickness of each layer was measured from the obtained observed image.
  • the storage elastic modulus (G ′) was measured under the following conditions using a rheometer (Anton Parr, MCR-301) for the samples in which the pressure-sensitive adhesive layers were stacked to have a thickness of 150 ⁇ m. Conditions: stress 1%, frequency 1Hz
  • Tan ⁇ was measured under the following conditions using a rheometer (Anton Parr, MCR-301) for the samples in which the pressure-sensitive adhesive layers were stacked to have a thickness of 150 ⁇ m. Conditions: stress 1%, frequency 1Hz
  • Production Example 1-1 (acrylic copolymer A1) Nitrogen gas was refluxed, and 25 parts by weight of 4-hydroxybutyl acrylate (4-HBA) and 2-ethylhexyl acrylate (2-EHA) were added to a 500 ml 4-neck reactor equipped with a cooling device to facilitate temperature control. After 50 parts by weight, 15 parts by weight of methyl acrylate (MA) and 10 parts by weight of isobornyl acrylate (IBOA) were added, 100 parts by weight of ethyl acetate (EAc) was added as a solvent. Then, after purging with nitrogen gas for 1 hour to remove oxygen, the temperature was maintained at 60 ° C.
  • 4-HBA 4-hydroxybutyl acrylate
  • 2-EHA 2-ethylhexyl acrylate
  • Production Example 1-2 (acrylic copolymer A2)
  • Acrylic copolymer A2 was produced in the same manner as in Production Example 1-1, except that butyl acrylate (BA) was used instead of methyl acrylate (MA).
  • BA butyl acrylate
  • MA methyl acrylate
  • Production Example 1-3 (acrylic copolymer A3)
  • Acrylic copolymer A3 was produced in the same manner as in Production Example 1-1, except that hexyl acrylate (HA) was used instead of methyl acrylate (MA).
  • HA hexyl acrylate
  • MA methyl acrylate
  • Production Example 1-4 (acrylic copolymer A4)
  • Acrylic copolymer A4 was produced in the same manner as in Production Example 1-1, except that lauryl acrylate (LA) was used instead of methyl acrylate (MA).
  • LA lauryl acrylate
  • MA methyl acrylate
  • Production Example 2-1 (acrylic copolymer B1) 20 parts by mass of methyl acrylate (MA) and 40 parts by mass of 4-hydroxybutyl acrylate (4-HBA) were added to a 500 ml 4-neck reactor in which a cooling device was installed so that nitrogen gas was refluxed and temperature control was facilitated. After each adding 40 parts by mass of octyl acrylate (OA), nitrogen gas was purged for 1 hour to remove oxygen, and then maintained at 80 ° C. After uniformly mixing the mixture, 3 parts by mass of the reactive photoinitiator, hydroxycyclohexyl phenyl ketone, was added to the mixture. Then, it was irradiated with ultraviolet rays (10 mW) with stirring to produce an acrylic copolymer B1.
  • MA methyl acrylate
  • 4-HBA 4-hydroxybutyl acrylate
  • Production Example 2-2 (acrylic copolymer B2)
  • Acrylic copolymer B2 was produced in the same manner as in Production Example 2-1 except that 2-ethylhexyl acrylate (2-EHA) was used instead of methyl acrylate (MA).
  • Production Example 2-3 (acrylic copolymer B3) Acrylic copolymer B3 was produced in the same manner as in Production Example 2-1 except that lauryl acrylate (LA) was used instead of methyl acrylate (MA).
  • LA lauryl acrylate
  • MA methyl acrylate
  • First adhesive sheet A mixture obtained by adding 0.5 parts by mass of a crosslinking agent (CORONATE-L, Tosoh Corp.) to 100 parts by mass of the acrylic copolymer shown in Table 1 on a release film coated with a silicone release agent. Applied. The applied mixture was dried at 100 ° C. for 1 minute. The thickness after drying was 25 ⁇ m. By joining a release film thereon, a first pressure-sensitive adhesive sheet (length 177 mm ⁇ width 105 mm) was produced.
  • a crosslinking agent CORONATE-L, Tosoh Corp.
  • FIG. 1 A 70 ⁇ m thick window film (base film 50 ⁇ m, each hard coat layer 10 ⁇ m, length 177 mm ⁇ width 105 mm) having hard coat layers formed on both sides of the base film was prepared as a front plate.
  • the base film of the window film is a polyimide resin film
  • the hard coat layer is a layer formed from a composition containing a dendrimer compound having a polyfunctional acrylic group at the end.
  • a circularly polarizing plate prepared as follows was used as a back plate. After forming a photo-alignment film on the substrate, a composition containing a dichroic dye and a polymerizable liquid crystal compound was applied to the substrate, aligned and cured to obtain a polarizer having a thickness of 2 ⁇ m. A 25 ⁇ m-thick triacetyl cellulose (TAC) film was attached onto the polarizer via an adhesive layer. A phase difference film (thickness: 17 ⁇ m, layer structure: overcoat layer (cured layer of acrylic resin composition, thickness: 1 ⁇ m) including a layer in which a substrate is peeled off and an exposed surface is polymerized and cured by a liquid crystal compound.
  • TAC triacetyl cellulose
  • Adhesive layer (thickness 5 ⁇ m) / ⁇ / 4 plate (thickness 3 ⁇ m) consisting of cured layer of liquid crystal compound and alignment film / Adhesive layer (thickness 5 ⁇ m) / From cured liquid crystal compound layer and alignment film A positive C plate (thickness 3 ⁇ m)) was attached.
  • the circularly polarizing plate thus prepared (layer structure of "TAC / polarizer / retardation film", thickness 44 ⁇ m, length 177 mm ⁇ width 105 mm) was prepared as a back plate.
  • the angle formed by the absorption axis of the polarizer and the slow axis of the ⁇ / 4 plate was 45 °.
  • the colorant-containing layer forming composition (black) prepared above is used as an ink and screen-printed using a 460-mesh screen so that the coating thickness after drying is 3 ⁇ m.
  • the amount of printing was performed to form a black print layer having a thickness of 3 ⁇ m and a width of 5 mm in the non-display area.
  • an electron beam vapor deposition device (product name: UNIVAC2050, manufactured by UNIVAC) is used to form a vapor deposition layer having a thickness of 80 ⁇ using TiO 2 as a vapor deposition source. Then, a vapor deposition layer with a thickness of 500 ⁇ is formed on it with In as a vapor deposition source, a vapor deposition layer with a thickness of 150 ⁇ is formed on it with TiO 2 as a vapor deposition source, and an Al 2 O 3 vapor deposition source is formed on it. As a result, a vapor deposition layer having a thickness of 150 ⁇ was formed.
  • a four-layer gold vapor deposition layer (plating layer, thickness ⁇ 1 ⁇ m) was formed in the entire area including the non-display area and the display area.
  • the composition for forming a protective layer (transparent) prepared above was used as an ink in a non-display area on the surface of the gold vapor deposition layer by screen printing using a 460 mesh screen to obtain a coating thickness after drying of 5 ⁇ m.
  • the printing was performed with the following discharge amount to form a protective layer, and the gold deposition layer in the region (display region) where the protective layer was not formed was removed by etching.
  • the layer structure of “black printed layer (thickness 3 ⁇ m) / gold vapor deposition layer (thickness ⁇ 1 ⁇ m) / protective layer (thickness 5 ⁇ m)” (total thickness more than 8 ⁇ m and less than 9 ⁇ m The colored layer 40 of 4) was formed.
  • Corona treatment was applied to the surface of the circularly polarizing plate on the black print layer side.
  • the second pressure-sensitive adhesive layer and the circularly polarizing plate were attached to each other so that the surface subjected to the corona treatment was the attachment surface.
  • the exposed second adhesive layer was subjected to corona treatment.
  • Corona treatment was applied to the first adhesive layer in the first adhesive sheet.
  • the second pressure-sensitive adhesive layer and the first pressure-sensitive adhesive layer were bonded together such that the surface subjected to corona treatment became the bonding surface.
  • the release film was peeled off from the first adhesive sheet, and the exposed first adhesive layer was subjected to corona treatment. Corona treatment was applied to one surface of the window film. The first pressure-sensitive adhesive layer and the window film were bonded together so that the surface subjected to corona treatment became the bonding surface.
  • ⁇ Compression modulus> A measurement sample (size 50 mm ⁇ 50 mm) was cut out from the pressure-sensitive adhesive layer used in each example and comparative example. Regarding the sample for measurement, the indenter was pressed in the direction of indentation using a micro hardness tester (HM-500, manufactured by Helmut Fischer, indenter type: diamond regular quadrangular pyramid) according to ISO-FDIS 14577-1 2013 (E). The test was carried out as follows at a measurement temperature of 25 ° C. so as to be perpendicular to the main surface (surface perpendicular to the thickness direction) of the measurement sample.
  • HM-500 manufactured by Helmut Fischer, indenter type: diamond regular quadrangular pyramid
  • the measured value is the indentation direction of the main surface of the measurement sample. This is the same as when the measurement is performed so as to be perpendicular to.
  • the indenter was in contact with the measurement sample and applying a load, after reaching the set test force (1 mN), it was held for 5 seconds for unloading.

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  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mathematical Physics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Adhesive Tapes (AREA)
  • Laminated Bodies (AREA)

Abstract

L'objet de l'invention est de fournir un stratifié optique qui est pliable et comprend une plaque avant et une plaque arrière en couches comportant une couche adhésive agencée entre elles, et une couche colorée formée dans une partie de la surface de la plaque avant ou de la plaque arrière sur le côté couche adhésive, l'entrée de bulles d'air de dimensions supérieures ou égales à 10 µm entre les couches étant supprimée. Ce stratifié optique comprend une plaque avant, une couche adhésive comprenant une première couche adhésive et une seconde couche adhésive, et une plaque arrière, qui ont été stratifiées dans cet ordre, et une couche colorée formée dans une partie de la plaque avant ou de la plaque arrière sur le côté couche adhésive associé, la couche adhésive étant disposée de sorte que la seconde couche adhésive se trouve sur le côté couche colorée, et stratifiée de manière à recouvrir au moins la partie d'extrémité sur le côté interne de la couche colorée dans une vue en plan du stratifié optique, la première couche adhésive et la seconde couche adhésive contenant une résine (méth)acrylique, et satisfaisant les expressions (1) 0,01 MPa ≤ module de stockage de la première couche adhésive et de la seconde couche adhésive ≤ 0,1 MPa et (2) 0,5 ≤ facteur de dissipation de la seconde couche adhésive ≤ 0,8.
PCT/JP2019/037782 2018-10-16 2019-09-26 Stratifié optique et dispositif d'affichage WO2020080055A1 (fr)

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WO2022255131A1 (fr) * 2021-06-04 2022-12-08 住友化学株式会社 Stratifié, et dispositif d'affichage
WO2022255132A1 (fr) * 2021-06-04 2022-12-08 住友化学株式会社 Stratifié, et dispositif d'affichage

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WO2016063802A1 (fr) * 2014-10-20 2016-04-28 積水化成品工業株式会社 Feuille de gel adhésif présentant des applications adhésives, son procédé de production, procédé permettant de fixer une paire d'objets et matériau composite
JP2017529433A (ja) * 2014-09-11 2017-10-05 エルジー・ケム・リミテッド 光学用粘着シート
JP2018090683A (ja) * 2016-12-01 2018-06-14 旭硝子株式会社 硬化性組成物、粘着層、粘着層付き面材、積層体および画像表示装置
WO2018180999A1 (fr) * 2017-03-29 2018-10-04 日東電工株式会社 Film polarisant protege par un seul côté avec couche adhésive sensible à la pression, dispositif d'affichage d'image et procédé de production continu à cet effet

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JP2008508394A (ja) * 2004-07-29 2008-03-21 スリーエム イノベイティブ プロパティズ カンパニー （メタ）アクリレートブロックコポリマー感圧接着剤
JP4806730B2 (ja) * 2008-10-15 2011-11-02 三菱樹脂株式会社 透明粘着シートおよび画像表示装置
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WO2016063802A1 (fr) * 2014-10-20 2016-04-28 積水化成品工業株式会社 Feuille de gel adhésif présentant des applications adhésives, son procédé de production, procédé permettant de fixer une paire d'objets et matériau composite
JP2018090683A (ja) * 2016-12-01 2018-06-14 旭硝子株式会社 硬化性組成物、粘着層、粘着層付き面材、積層体および画像表示装置
WO2018180999A1 (fr) * 2017-03-29 2018-10-04 日東電工株式会社 Film polarisant protege par un seul côté avec couche adhésive sensible à la pression, dispositif d'affichage d'image et procédé de production continu à cet effet

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Publication number Priority date Publication date Assignee Title
WO2022255131A1 (fr) * 2021-06-04 2022-12-08 住友化学株式会社 Stratifié, et dispositif d'affichage
WO2022255132A1 (fr) * 2021-06-04 2022-12-08 住友化学株式会社 Stratifié, et dispositif d'affichage

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