WO2020195541A1 - Corps stratifié et dispositif d'affichage - Google Patents

Corps stratifié et dispositif d'affichage Download PDF

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Publication number
WO2020195541A1
WO2020195541A1 PCT/JP2020/008303 JP2020008303W WO2020195541A1 WO 2020195541 A1 WO2020195541 A1 WO 2020195541A1 JP 2020008303 W JP2020008303 W JP 2020008303W WO 2020195541 A1 WO2020195541 A1 WO 2020195541A1
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WIPO (PCT)
Prior art keywords
layer
sensitive adhesive
pressure
film
adhesive layer
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PCT/JP2020/008303
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English (en)
Japanese (ja)
Inventor
柱烈 張
恩瑛 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 KR1020217032419A priority Critical patent/KR20210146324A/ko
Priority to CN202080023261.9A priority patent/CN113613880A/zh
Publication of WO2020195541A1 publication Critical patent/WO2020195541A1/fr

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    • 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]
    • 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
    • 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
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • 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
    • C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
    • C09J2203/318—Applications of adhesives in processes or use of adhesives in the form of films or foils for the production of liquid crystal displays
    • 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
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/20—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive itself
    • C09J2301/208—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive itself the adhesive layer being constituted by at least two or more adjacent or superposed adhesive layers, e.g. multilayer adhesive
    • 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
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
    • C09J2301/312—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier parameters being the characterizing feature

Definitions

  • the present invention relates to a laminate and a display device.
  • Patent Document 1 a transparent film base material is bonded onto a polarizing plate via a first adhesive sheet, and a front transparent member is attached to the transparent film base material via a second adhesive sheet.
  • Patent Document 2 discloses a laminate for an image display device including a plurality of pressure-sensitive adhesive layers and an optical film containing a polarizing film.
  • the laminated body In the laminated body, a method of forming a layer constituting the laminated body by a thin film coating is adopted in order to realize thinning and weight reduction. However, there is a problem that cracks are likely to occur in the coating layer when the laminate including the coating layer is bent.
  • An object of the present invention is to provide a laminated body in which the generation of cracks due to bending is suppressed in the coating layer and a display device provided with the same.
  • a laminate comprising a first protective layer, a first pressure-sensitive adhesive layer, a base material layer, an intervening coating layer, a second pressure-sensitive adhesive layer, and a second protective layer in this order. Each layer is in contact with each other
  • the storage elastic modulus of the first pressure-sensitive adhesive layer at a temperature of 25 ° C. is G'1 [kPa]
  • the storage elastic modulus of the second pressure-sensitive adhesive layer at a temperature of 25 ° C. is G'2 [kPa].
  • the present invention it is possible to provide a laminated body in which the generation of cracks due to bending is suppressed in the coating layer and a display device provided with the laminated body.
  • FIG. 1 shows a schematic cross-sectional view of a laminate (optical laminate) according to one aspect of the present invention.
  • the laminate 100 includes a first protective layer 10, a first adhesive layer 11, a base material layer 15, an intervening coating layer 12, a second adhesive layer 13, and a second protective layer 14 in this order. ..
  • the layers are in contact with each other.
  • the first pressure-sensitive adhesive layer 11 and the second pressure-sensitive adhesive layer 13 may be collectively referred to as a pressure-sensitive adhesive layer.
  • 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, 30 ⁇ m or more and 1000 ⁇ m or less, preferably 40 ⁇ m or more and 500 ⁇ m or less, and more preferably 50 ⁇ m or more. It is 300 ⁇ m or less.
  • the plan view shape of the laminated body 100 may be, for example, a rectangular shape, preferably a rectangular shape having a long side and a short side, and more preferably a rectangular shape.
  • 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 may have corners R-processed, end portions notched, or perforated.
  • 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 storage elastic modulus of the first pressure-sensitive adhesive layer 11 at a temperature of 25 ° C. is G'1 [kPa]
  • the storage elastic modulus of the second pressure-sensitive adhesive layer 13 at a temperature of 25 ° C. is G'2 [kPa].
  • the laminate 100 preferably has the following formula (3'): A1 + A2 ⁇ 130 (3') Meet.
  • the laminate 100 preferably has the following formula (4'): A2-A1 ⁇ 100 (4') Meet.
  • the laminate 100 preferably has the following formula (5'): A2 ⁇ 60 (5') Meet.
  • the evaluation parameters A1 and A2 of the first pressure-sensitive adhesive layer 11 and the second pressure-sensitive adhesive layer 13 increase as the storage elastic modulus increases, and increase as the layer thickness decreases. That is, the larger A1 and A2, the harder the pressure-sensitive adhesive layer tends to be, and the smaller A1 and A2, the softer the pressure-sensitive adhesive layer tends to be.
  • the present inventors increase the tensile stress of the coating layer when the coating layer is adjacent to the outside of the relatively hard pressure-sensitive adhesive layer with reference to the bending axis. It was found that cracks are likely to occur. On the contrary, when the laminated body is bent, if the coating layer is adjacent to the inside of the relatively hard adhesive layer with reference to the bending axis, the tensile stress of the coating layer decreases and cracks occur. I found it difficult to do. Therefore, when the first pressure-sensitive adhesive layer 11 and the second pressure-sensitive adhesive layer 13 satisfy the above formulas (3), (4) and (5), the intervening coating layer 12 sandwiched between them has an increased tensile stress. It was found that it was difficult and even if the first protective layer was repeatedly bent inward, the occurrence of cracks was suppressed.
  • bending includes a form of bending in which a curved surface is formed in a bent portion.
  • the bending radius of the bent inner surface is not particularly limited. Bending also includes a form of refraction in which the refraction angle of the inner surface is greater than 0 degrees and less than 180 degrees, and a form of folding in which the bending radius of the inner surface is close to zero or the refraction angle of the inner surface is 0 degrees. ..
  • the crack resistance of the coating layer is improved to the extent that cracks do not occur even if the laminate is repeatedly bent 200,000 times or more with a bending radius of 1 mm according to the test method described in the column of Examples described later. Can be made to.
  • the cracks generated in the coating layer include cracks generated in the coating layer and peeling between the coating layer and the pressure-sensitive adhesive layer.
  • the first pressure-sensitive adhesive layer 11 is formed from the first pressure-sensitive adhesive composition
  • the second pressure-sensitive adhesive layer 13 is formed from the second pressure-sensitive adhesive composition.
  • the first pressure-sensitive adhesive composition and the second pressure-sensitive adhesive so that the evaluation parameters A1 and A2 of the first pressure-sensitive adhesive layer 11 and the second pressure-sensitive adhesive layer 13 satisfy the formulas (3), (4) and (5).
  • the pressure-sensitive adhesive layer is composed of the pressure-sensitive adhesive composition described later, the type of monomer constituting the (meth) acrylic polymer described later is changed, or the (meth) acrylic polymer is prepared. Examples thereof include a method of adjusting the molecular weight, a method of adjusting the thickness of the pressure-sensitive adhesive layer, a method of combining these, and the like.
  • the first pressure-sensitive adhesive layer 11 may be the following pressure-sensitive adhesive layer.
  • the storage elastic modulus G'1 of the first pressure-sensitive adhesive layer 11 at a temperature of 25 ° C. is usually 10 kPa or more, preferably 30 kPa or more.
  • the storage elastic modulus G'1 of the first pressure-sensitive adhesive layer 11 at a temperature of 25 ° C. is usually 10000 kPa or less, more preferably 5000 kPa or less, and further preferably 1000 kPa or less.
  • the storage elastic modulus of the pressure-sensitive adhesive layer is measured according to the method described in the column of Examples described later. If the storage elastic modulus G'1 is too small, the processability of the laminated body tends to decrease.
  • the end of the adhesive falls off from the laminated body (glue removal), making it difficult to peel off the release film. It becomes easy for the laminate to become dirty. If the storage elastic modulus G'1 is too large, the flexibility of the laminated body tends to decrease.
  • the thickness a1 of the first pressure-sensitive adhesive layer 11 may be 1 ⁇ m or more, preferably 3 ⁇ m or more.
  • the thickness a1 of the first pressure-sensitive adhesive layer 11 may be 100 ⁇ m or less, preferably 50 ⁇ m or less.
  • the second pressure-sensitive adhesive layer 13 may be the following pressure-sensitive adhesive layer.
  • the storage elastic modulus G'2 of the second pressure-sensitive adhesive layer 13 at a temperature of 25 ° C. is usually 10 kPa or more, preferably 30 kPa or more.
  • the storage elastic modulus G'2 of the second pressure-sensitive adhesive layer 13 at a temperature of 25 ° C. is usually 10000 kPa or less, more preferably 5000 kPa or less, and further preferably 1000 kPa or less.
  • the storage elastic modulus of the pressure-sensitive adhesive layer is measured according to the method described in the column of Examples described later. If the storage elastic modulus G'2 is too small, the processability of the laminated body tends to decrease.
  • the end of the adhesive falls off from the laminated body (glue removal), making it difficult to peel off the release film. It becomes easy for the laminate to become dirty. If the storage elastic modulus G'2 is too large, the flexibility of the laminated body tends to decrease.
  • the thickness a2 of the second pressure-sensitive adhesive layer 13 may be 1 ⁇ m or more, preferably 3 ⁇ m or more.
  • the thickness a2 of the second pressure-sensitive adhesive layer 13 may be 100 ⁇ m or less, preferably 50 ⁇ m or less.
  • the coating layer is a layer other than the pressure-sensitive adhesive layer formed by including the step of applying the coating liquid.
  • the intervening coating layer 12 may include a polarizer layer, a retardation layer, a touch sensor panel, an adhesive layer, or a coloring layer, preferably including the following polarizer layer, a retardation layer or a touch sensor panel, and more. It preferably includes a polarizer layer or a retardation layer.
  • the colored layer can be a layer that shields wiring or the like arranged in a non-display area of the image display device. By arranging the colored layer on the peripheral edge of the laminated body, light leakage can be suppressed, and the colored layer can be visually recognized like a frame, so that the design can be improved.
  • the coating method includes a coating method, a printing method, a vapor deposition method, and the like.
  • the coating methods include bar coating method, knife coating method, blade coating method, die coating method, direct gravure coating method, reverse gravure coating method, roll coating method, CAP coating method, spin coating method, spray coating method, and screen coating method.
  • Examples include the slit coating method and the dip coating method.
  • Examples of the printing method include an offset printing method, a gravure printing method, a screen printing method, and an inkjet printing method.
  • the vapor deposition method include a sputtering method, a physical vapor deposition method (PVD), a chemical vapor deposition method (CVD), and a plasma CVD method (PECVD).
  • the intervening coating layer 12 is composed of one or more layers.
  • the thickness of each layer is usually 5 ⁇ m or less.
  • the thickness of each layer is usually 0.01 ⁇ m or more.
  • the thickness of the intervening coating layer 12 is preferably 1 ⁇ m or more and 20 ⁇ m or less, and can be 10 ⁇ m or less.
  • the intervening coating layer 12 includes a polarizer layer, the thickness of the intervening coating layer 12 is, for example, 1 ⁇ m or more and 15 ⁇ m or less.
  • the intervening coating layer 12 includes a retardation layer, the thickness of the intervening coating layer 12 is, for example, 1 ⁇ m or more and 8 ⁇ m or less.
  • the intervening coating layer 12 includes the touch sensor panel, the thickness of the intervening coating layer 12 is, for example, 15 ⁇ m or less.
  • the base material layer 15 is usually a base material to which the above coating liquid is applied.
  • the base material layer 15 may be the following base material film.
  • the first protective layer 10 The entire structural portion that is a part of the laminate and is in contact with the first pressure-sensitive adhesive layer 11 and exists on the side opposite to the base material layer 15 side is designated as the first protective layer 10. When there are a plurality of layers on the side opposite to the base material layer 15 side with the first pressure-sensitive adhesive layer 11 interposed therebetween, all of them are designated as the first protective layer 10.
  • the first protective layer 10 may include one or more of the following front plate, base film, pressure-sensitive adhesive layer, polarizer layer, retardation layer, touch sensor panel, bonding layer, back plate and the like.
  • the first protective layer 10 preferably includes a front plate.
  • the entire structural portion that is a part of the laminate and is in contact with the second pressure-sensitive adhesive layer 13 and exists on the side opposite to the intervening coating layer 12 side is designated as the second protective layer 14.
  • the second protective layer 14 may include one or more of the following base film, pressure-sensitive adhesive layer, polarizer layer, retardation layer, touch sensor panel, bonding layer, back plate and the like.
  • the second protective layer 14 preferably includes a back plate.
  • the first protective layer 10 and the first protective layer 10 can be recognized in a plurality of patterns.
  • the laminate 100 is composed of a front plate / adhesive layer I / base film I / coating layer I / adhesive layer II / base film II / coating layer II / adhesive layer III / back plate (“/”. "" Means that adjacent layers are in contact with each other.
  • the first protective layer 10, the first adhesive layer 11, the intervening coating layer 12, the second adhesive layer 13 and the second protective layer 14 are , Can be certified in two patterns. That is, the first protective layer 10 is a front plate, the first pressure-sensitive adhesive layer 11 is the pressure-sensitive adhesive layer I, the base material layer 15 is the base material film I, and the intervening coating layer 12 is the coating layer I. It can be recognized that the second pressure-sensitive adhesive layer 13 is the pressure-sensitive adhesive layer II and the second protective layer 14 is the base film II / coating layer II / pressure-sensitive adhesive layer III / back plate.
  • the first protective layer 10 is a front plate / adhesive layer I / base film I / coating layer I
  • the first adhesive layer 11 is an adhesive layer II
  • the base layer 15 is a base film.
  • the intervening coating layer 12 is the coating layer II
  • the second pressure-sensitive adhesive layer 13 is the pressure-sensitive adhesive layer III
  • the second protective layer 14 is the back plate.
  • the laminate satisfying the formulas (3), (4) and (5) pertaining to the evaluation parameters A1 and A2 is bent when the first protective layer is turned inside. , The generation of cracks in the coating layer is suppressed.
  • the material and thickness of the front plate are not limited as long as it is a plate-like body capable of transmitting light, and the front plate 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 a touch sensor panel described later.
  • the front plate can constitute the outermost surface of the display device.
  • the thickness of the front plate may be, for example, 10 ⁇ m or more and 1000 ⁇ m or less, preferably 20 ⁇ m or more and 500 ⁇ m or less, and more preferably 30 ⁇ m or more and 300 ⁇ m or less.
  • the thickness of each layer can be measured according to the thickness measuring method described in Examples described later.
  • the resin plate-like body is not limited as long as it can transmit light.
  • the resin constituting the resin plate such as a resin film include triacetyl cellulose, acetyl cellulose butyrate, ethylene-vinyl acetate copolymer, propionyl cellulose, butyryl cellulose, acetyl propionyl cellulose, polyester, and polystyrene.
  • Polyamide polyetherimide, poly (meth) acrylic, polyimide, polyether sulfone, polysulfone, polyethylene, polypropylene, polymethylpentene, polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol, polyvinyl acetal, polyether ketone, polyether ether ketone , Polyether sulfone, polymethyl methacrylate, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polycarbonate, polyamideimide and the like. These polymers can be used alone or in combination of two or more. From the viewpoint of improving strength and transparency, a resin film made of a polymer such as polyimide, polyamide, or polyamideimide is preferable.
  • the front plate is preferably a film in which a hard coat layer is provided on at least one surface of the base film from the viewpoint of hardness.
  • 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. By providing the hard coat layer, a resin film having improved hardness and scratchability can be obtained.
  • 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, epoxy resin and the like.
  • the hard coat layer may contain additives to improve hardness. Additives are not limited, and examples thereof include inorganic fine particles, organic fine particles, and mixtures thereof.
  • the front plate is a glass plate
  • tempered glass for a display is preferably used as the glass plate.
  • the thickness of the glass plate may be, for example, 10 ⁇ m or more and 1000 ⁇ m or less, and may be 50 ⁇ m or more and 500 ⁇ m or less.
  • the front plate not only has a function of protecting the front surface (screen) of the display device (function as a window film), but also functions as a touch sensor, a blue light cut function, and the like. It may have a viewing angle adjusting function or the like.
  • the front plate preferably has a tensile elastic modulus of 4.0 GPa or more at a temperature of 23 ° C., and more preferably 5.0 GPa or more. ..
  • the front plate preferably has a tensile elastic modulus of 20 GPa or less at a temperature of 23 ° C., and more preferably 15 GPa or less, from the viewpoint of easily forming a laminated body 100 having excellent flexibility.
  • the tensile modulus can be measured by the test method described in the Examples column below.
  • the base film may be composed of, for example, a resin film, preferably a transparent resin film.
  • the resin film may be a long roll-shaped resin film or a single-wafer-shaped resin film. A long roll-shaped resin film is preferable because it can be continuously produced.
  • the resin constituting the resin film examples include polyolefins such as polyethylene, polypropylene, norbornene-based polymer, and cyclic olefin-based resin; polyvinyl alcohol; polyethylene terephthalate; polymethacrylic acid ester; polyacrylic acid ester; triacetylcellulose, diacetylcellulose, and the like.
  • plastics such as cellulose ester such as cellulose acetate propionate; polyethylene naphthalate; polycarbonate; polysulfone; polyether sulfone; polyether ketone; polyphenylene sulfide; polyphenylene oxide; polyamide; polyimide; polyamideimide.
  • cyclic olefin resins, cellulose esters and polyimides are preferable.
  • the thickness of the resin film is preferably thin from the viewpoint of thinning the laminate 100, but if it is too thin, it tends to be difficult to secure impact resistance.
  • the thickness of the resin film 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.
  • a coating layer can be formed on the base film.
  • the base film may have a hard coat layer, an antireflection layer, or an antistatic layer on at least one surface.
  • the base film 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 coating layer is not formed.
  • the base film 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 coating layer is formed.
  • the substrate film may include an adhesive layer for bonding with other layers.
  • the pressure-sensitive adhesive layer is a layer that is interposed between the two layers and adheres them, for example, a layer composed of a pressure-sensitive adhesive or an adhesive, or a layer obtained by applying some treatment to the layer. You can.
  • the pressure-sensitive adhesive is also called a pressure-sensitive adhesive.
  • the term "adhesive" refers to an adhesive other than an adhesive (pressure sensitive adhesive) and is clearly distinguished from an adhesive.
  • the pressure-sensitive adhesive layer may be one layer or two or more layers, but is preferably one layer.
  • the pressure-sensitive adhesive layer can be formed from the pressure-sensitive adhesive composition.
  • the pressure-sensitive adhesive layer can be composed of a pressure-sensitive adhesive composition containing a resin such as (meth) acrylic, rubber, urethane, ester, silicone, or polyvinyl ether as a main component.
  • 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, ethyl (meth) acrylate, isooctyl (meth) acrylate, and 2- (meth) acrylate.
  • a polymer or copolymer containing one or more (meth) acrylic acid esters such as ethylhexyl as a monomer is preferably used.
  • the base polymer is preferably copolymerized with a polar monomer.
  • Examples of the polar monomer include (meth) acrylic acid, 2-hydroxypropyl (meth) acrylate, hydroxyethyl (meth) acrylate, (meth) acrylamide, N, N-dimethylaminoethyl (meth) acrylate, and glycidyl ( Examples thereof include monomers having a carboxyl group, a hydroxyl group, an amide group, an amino group, an epoxy group and the like, such as meta) acrylate.
  • 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.
  • 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 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, UV absorbers, 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 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 pressure-sensitive adhesive layer is, for example, preferably 1 ⁇ m or more and 100 ⁇ m or less, more preferably 3 ⁇ m or more and 50 ⁇ m or less, and may be 20 ⁇ m or more.
  • the polarizer layer examples include a stretched film or a stretched layer on which a dichroic dye is adsorbed, a layer formed by applying and curing a composition containing a dichroic dye and a polymerizable compound, and the like.
  • the dichroic dye specifically, iodine or a dichroic organic dye is used.
  • dichroic organic dyes C.I. I. Included are dichroic direct dyes composed of disuazo compounds such as DIRECT RED 39 and dichroic direct dyes composed of compounds such as trisazo and tetrakisazo.
  • the polarizer layer formed by applying and curing a composition containing a dichroic dye and a polymerizable compound is a composition containing a dichroic dye having a liquid crystal property or a composition containing a dichroic dye and a polymerizable liquid crystal.
  • examples thereof include a polarizer layer containing a cured product of a polymerizable liquid crystal compound such as a layer obtained by applying and curing an object.
  • a polarizer layer obtained by applying and curing a composition containing a dichroic dye and a polymerizable compound is preferable because there is no limitation in the bending direction as compared with a stretched film or a stretched layer on which a dichroic dye is adsorbed.
  • the polarizer layer which is a stretched film on which a bicolor dye is adsorbed, is usually bicolorized by a step of uniaxially stretching the polyvinyl alcohol-based resin film and dyeing the polyvinyl alcohol-based resin film with the bicolor dye. It can be produced through a step of adsorbing a dye, a step of treating a polyvinyl alcohol-based resin film on which a bicolor dye is adsorbed with an aqueous boric acid solution, and a step of washing with water after the treatment with the aqueous boric acid solution.
  • the thickness of the polarizer layer is, for example, 2 ⁇ m or more and 40 ⁇ m or less.
  • the thickness of the polarizer layer may be 5 ⁇ m or more, 20 ⁇ m or less, further 15 ⁇ m or less, and further 10 ⁇ 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 about 85 mol% or more and 100 mol% or less, 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 polarizing element layer which is a stretched layer on which a dichroic dye is adsorbed, is usually a step of applying a coating liquid containing the polyvinyl alcohol-based resin on a base film, a step of uniaxially stretching the obtained laminated film, and a uniaxial A step of dyeing the polyvinyl alcohol-based resin layer of the stretched laminated film with a dichroic dye to adsorb the dichroic dye to form a polarizer layer, and boric acid on the film on which the dichroic dye is adsorbed. It can be produced through a step of treating with an aqueous solution and a step of washing with water after treatment with an aqueous boric acid solution. If necessary, the base film may be peeled off from the polarizer layer.
  • the material and thickness of the base film may be the same as the material and thickness of the thermoplastic resin film described later.
  • the stretched film or the polarizer layer which is a stretched layer, may be incorporated into the laminate in a 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 layer 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.
  • thermoplastic resin film may or may not have a phase difference.
  • thermoplastic resin film can be bonded to the polarizer layer by using, for example, an adhesive layer.
  • the polarizer layer formed by applying and curing a composition containing a dichroic dye and a polymerizable compound includes a composition containing a dichroic dye having a liquid crystal property or a dichroic dye and a polymerizable liquid crystal. Examples thereof include a polarizer layer containing a cured product of a polymerizable liquid crystal compound, such as a layer obtained by applying a composition containing the above to a substrate film and curing the composition.
  • the base film may be peeled off from the polarizer layer.
  • the material and thickness of the base film may be the same as the material and thickness of the thermoplastic resin film described above.
  • the polarizer layer obtained by applying and curing the composition containing the dichroic dye and the polymerizable compound may be incorporated into the optical laminate in the form in which a thermoplastic resin film is bonded to one side or both sides thereof. ..
  • a thermoplastic resin film the same one as the thermoplastic resin film that can be used for the stretched film or the polarizer layer that is the stretched layer can be used.
  • the thermoplastic resin film can be bonded to the polarizer layer using, for example, an adhesive layer.
  • the thickness of the polarizer layer obtained by applying and curing the composition containing the dichroic dye and the polymerizable compound is usually 10 ⁇ m or less, preferably 0.5 ⁇ m or more and 8 ⁇ m or less, and more preferably 1 ⁇ m or more and 5 ⁇ m or less. Is.
  • the intervening coating layer 12 can include, for example, a polarizer layer obtained by applying and curing a composition containing a dichroic dye and a polymerizable compound.
  • the structure including the base material layer 15 and the intervening coating layer 12 in contact with each other includes a structure in which a polarizer layer formed by applying a composition containing a dichroic dye and a polymerizable compound on a base film and curing the composition. Examples thereof include a structure in which a thermoplastic resin film is bonded to a polarizer layer obtained by applying and curing a composition containing a dichroic dye and a polymerizable compound.
  • the intervening coating layer 12 contains a polarizer layer obtained by applying and curing a composition containing a dichroic dye and a polymerizable compound
  • the intervening coating layer 12 is an alignment film or a protective layer (specifically, a kind of coating layer). Examples thereof include a hard coat (OC) layer and an overcoat (HC) layer).
  • the laminated body 100 can include one layer or two or more retardation layers.
  • the retardation layer is usually arranged between the polarizer layer and the back plate.
  • the retardation layer is formed through a first pressure-sensitive adhesive layer 11, a second pressure-sensitive adhesive layer 13, or a layer composed of a pressure-sensitive adhesive or an adhesive other than these layers (hereinafter, also referred to as a bonding layer). (Including other retardation layers.) Can be laminated on top.
  • the retardation layer can be a positive A plate such as a ⁇ / 4 plate or a ⁇ / 2 plate, and a positive C plate.
  • the retardation layer may be a resin film exemplified as the material of the protective film described above, or may be a layer formed by curing a polymerizable liquid crystal compound.
  • the retardation layer may further include an alignment film and a base film.
  • the thickness of the retardation layer is, for example, 0.1 ⁇ m or more and 10 ⁇ m or less, preferably 0.5 ⁇ m or more and 8 ⁇ m or less, and more preferably 1 ⁇ m or more and 6 ⁇ m or less.
  • the retardation layer formed by curing the polymerizable liquid crystal compound can be formed by applying a composition containing the polymerizable liquid crystal compound to a base film and curing the composition.
  • An orientation layer may be formed between the base film and the coating layer.
  • the material and thickness of the base film may be the same as the material and thickness of the thermoplastic resin film described above.
  • the retardation layer formed by curing the polymerizable liquid crystal compound may be incorporated into the laminate 100 in the form of having an alignment layer and / or a base film.
  • the intervening coating layer 12 can include, for example, a retardation layer obtained by curing a polymerizable liquid crystal compound.
  • Examples of the structure including the base material layer 15 and the intervening coating layer 12 in contact with each other include a structure in which a retardation layer formed by curing a polymerizable liquid crystal compound is formed on the base material film.
  • the intervening coating layer 12 is an alignment film or a protective layer (specifically, a hard coat layer or an overcoat layer) which is a kind of coating layer. ) And the like may be further included.
  • the touch sensor panel may include an adhesive layer, a separation layer, a protective layer, and the like between the transparent conductive layer and the base film that supports the transparent conductive layer.
  • the adhesive layer include an adhesive layer and an adhesive layer.
  • the base film that supports the transparent conductive layer include a base film in which a transparent conductive layer is vapor-deposited on one surface, a base film in which the transparent conductive layer is transferred via an adhesive layer, and the like.
  • An example of a capacitance type touch sensor panel is composed of a base film, a transparent conductive layer for position detection provided on the surface of the base film, and a touch position detection circuit.
  • a display device provided with an optical laminate having a capacitance type touch sensor panel
  • the transparent conductive layer is grounded via the capacitance of the human body at the touched point.
  • the touch position detection circuit detects the grounding of the transparent conductive layer, and the touched position is detected.
  • the transparent conductive layer may be a transparent conductive layer made of a metal oxide such as ITO, or may be a metal layer made of a metal such as aluminum, copper, silver, gold, or an alloy thereof.
  • the transparent electrode layer is formed by a coating method such as a sputtering method, a printing method, or a thin film deposition method.
  • a photosensitive resist is formed on the transparent electrode layer, and then an electrode pattern layer is formed by photolithography.
  • the photosensitive resist a negative type photosensitive resist or a positive type photosensitive resist is used, and the photosensitive resist may remain or be removed after patterning.
  • a mask having an electrode pattern shape can be arranged and sputtering can be performed to form an electrode pattern layer.
  • the separation layer can be a layer formed on a substrate such as glass and for separating the transparent conductive layer formed on the separation layer from the substrate together with the separation layer.
  • the separation layer is preferably an inorganic layer or an organic layer. Examples of the material forming the inorganic layer include silicon oxide.
  • the material for forming the organic material layer for example, a (meth) acrylic resin composition, an epoxy resin composition, a polyimide resin composition, or the like can be used.
  • the separation layer can be formed by applying it by a known coating method and curing it by a method of thermosetting, UV curing, or a combination thereof.
  • the protective layer can be provided in contact with the transparent conductive layer to protect the conductive layer.
  • the protective layer contains at least one of an organic insulating film and an inorganic insulating film, and these films can be formed by a coating method such as a spin coating method, a sputtering method, or a vapor deposition method.
  • the insulating layer can be formed from, for example, an inorganic insulating substance such as silicon oxide or a transparent organic substance such as an acrylic resin.
  • the insulating layer can be formed by heat curing, UV curing, heat drying, vacuum drying, or the like after coating by a known coating method.
  • triacetyl cellulose polyethylene terephthalate, cycloolefin polymer, polyethylene naphthalate, polyolefin, polycycloolefin, polycarbonate, polyether sulfone, polyarylate, polyimide, polyamide, polystyrene, polynorbornene, etc.
  • Resin film can be mentioned.
  • Polyethylene terephthalate is preferably used from the viewpoint of easily forming a base film having a desired toughness.
  • the base film of the touch sensor panel preferably has a thickness of 50 ⁇ m or less, and more preferably 30 ⁇ m or less, from the viewpoint of easily forming an optical laminate having excellent bending resistance.
  • the base film of the touch sensor panel has a thickness of, for example, 5 ⁇ m or more.
  • the touch sensor panel can be manufactured as follows, for example.
  • the base film is first laminated on the substrate via the adhesive layer.
  • a transparent conductive layer patterned by photolithography is formed on the base film.
  • the substrate and the base film are separated to obtain a touch sensor panel composed of the transparent conductive layer and the base film.
  • the substrate is not particularly limited as long as it maintains flatness and has heat resistance, but is preferably a glass substrate.
  • a material for forming a separation layer is first applied on a substrate to form a separation layer.
  • a protective layer is formed on the separation layer by coating.
  • a protective layer may be formed in the portion where the pad pattern layer is formed so that the protective layer is not formed.
  • a transparent conductive layer patterned by photolithography is formed on the separation layer (or protective layer).
  • An insulating layer is formed on the transparent conductive layer so as to fill the electrode pattern layer.
  • a protective film is laminated on the insulating layer with a peelable adhesive, and the insulating layer to the separating layer are transferred to separate the substrate. By peeling off the peelable protective film, a touch sensor panel having an insulating layer / a transparent conductive layer / (protective layer) / a separating layer in this order can be obtained.
  • the thickness of the touch sensor panel may be, for example, 5 ⁇ m or more and 2000 ⁇ m or less, and may be 5 ⁇ m or more and 100 ⁇ m or less.
  • the thickness of the touch sensor panel is, for example, 0.5 ⁇ m or more and 10 ⁇ m or less, preferably 5 ⁇ m or less.
  • the intervening coating layer 12 can include, for example, a touch sensor panel manufactured by the second method.
  • a touch sensor panel manufactured by the second method As a structure including the base material layer 15 and the intervening coating layer 12 in contact with each other, the touch sensor panel and the base material film produced by the first method and the touch sensor panel produced by the second method are adhered with an adhesive. A combined structure can be mentioned.
  • the bonding layer is a layer composed of an adhesive or an adhesive.
  • the bonding layer can be, for example, a layer for bonding the front plate and the touch sensor panel, a layer for bonding the front plate and the polarizing plate, and a layer for bonding the polarizing plate and the touch sensor panel.
  • the pressure-sensitive adhesive constituting the bonding layer may be the same as that exemplified for the pressure-sensitive adhesive composition constituting the pressure-sensitive adhesive layer, or other pressure-sensitive adhesives such as (meth) acrylic pressure-sensitive adhesive and styrene-based adhesive.
  • the laminate 100 may be a pressure-sensitive adhesive, a silicone-based pressure-sensitive adhesive, a rubber-based pressure-sensitive adhesive, a urethane-based pressure-sensitive adhesive, a polyester-based pressure-sensitive adhesive, an epoxy-based copolymer pressure-sensitive adhesive, or the like.
  • the laminate 100 may include one laminating layer or two or more laminating layers. When the laminate 100 includes a plurality of bonded layers, the plurality of bonded layers may be the same as each other or may be different from each other.
  • the adhesive constituting the bonded layer for example, one or two or more of water-based adhesives, active energy ray-curable adhesives, adhesives and the like can be combined to form the adhesive.
  • the water-based adhesive include a polyvinyl alcohol-based resin aqueous solution, a water-based two-component urethane-based emulsion adhesive, and the like.
  • the active energy ray-curable adhesive is an adhesive that cures by irradiating with active energy rays such as ultraviolet rays, and includes, for example, a polymerizable compound and a photopolymerizable initiator, a photoreactive resin, and the like. Examples thereof include those containing a binder resin and a photoreactive cross-linking agent.
  • Examples of the polymerizable compound include photopolymerizable monomers such as a photocurable epoxy monomer, a photocurable acrylic monomer, and a photocurable urethane monomer, and oligomers derived from these monomers.
  • Examples of the photopolymerization initiator include substances that generate active species such as neutral radicals, anionic radicals, and cationic radicals by irradiating them with active energy rays such as ultraviolet rays.
  • the thickness of the bonded layer may be, for example, 1 ⁇ m or more, preferably 1 ⁇ m or more and 25 ⁇ m or less, more preferably 2 ⁇ m or more and 15 ⁇ m or less, and further preferably 2.5 ⁇ m or more and 5 ⁇ m or less.
  • Back plate As the back plate, a plate-like body capable of transmitting light, a component used in a normal display device, or the like can be used.
  • the thickness of the back plate may be, for example, 5 ⁇ m or more and 2000 ⁇ m or less, preferably 10 ⁇ m or more and 1000 ⁇ m or less, and more preferably 15 ⁇ m or more and 500 ⁇ m or less.
  • the plate-like body used for the back plate may be composed of only one layer, may be composed of two or more layers, and the plate-like body described in the above-mentioned front plate may be used as an example. it can.
  • Examples of components used in a normal display device used for a back plate include a touch sensor panel, an organic EL display element, and the like.
  • Examples of the stacking order of the components in the display device include a window film / circular polarizing plate / touch sensor panel / organic EL display element, a window film / touch sensor panel / circular polarizing plate / organic EL display element, and the like.
  • the tensile elastic modulus at a temperature of 23 ° C. is preferably 4.0 GPa or more, and more preferably 4.5 GPa or more. ..
  • the back plate preferably has a tensile elastic modulus of 20 GPa or less at a temperature of 23 ° C., and more preferably 15 GPa or less.
  • the tensile modulus can be measured by the test method described in the Examples column below.
  • the laminate 100 can be manufactured by a method including a step of adhering layers constituting the laminate 100 to each other via an adhesive layer or an adhesive layer.
  • a surface activation treatment such as corona treatment in order to improve the adhesion. Is preferable.
  • the display device according to the present invention includes the laminate 100 according to the present invention.
  • the display device is not particularly limited, and examples thereof include an image display device such as an organic EL display device, an inorganic EL display device, a liquid crystal display device, and an electroluminescent display device.
  • the display device may have a touch panel function.
  • the optical laminate is suitable for a flexible display device that can be bent or bent.
  • the optical laminate is arranged on the visible side of the display element of the display device with the front plate facing the outside (the side opposite to the display element side, that is, the visual recognition side).
  • the display device can be used as a mobile device such as a smartphone or tablet, a television, a digital photo frame, an electronic signboard, a measuring instrument or an instrument, an office device, a medical device, a computer device, or the like.
  • Base film a triacetyl cellulose (TAC) film (manufactured by Konica Minolta Co., Ltd., thickness 25 ⁇ m) was prepared.
  • TAC triacetyl cellulose
  • Polymer 1 is a polymer having a photoreactive group consisting of the following structural units. From the GPC measurement, the molecular weight of the obtained polymer 1 showed a number average molecular weight of 28200 and Mw / Mn1.82, and the monomer content was 0.5%. A solution prepared by dissolving polymer 1 in cyclopentanone at a concentration of 5% by mass was used as a composition for forming an alignment film.
  • 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 layer has 75 parts by mass of the compound (1-6), 25 parts by mass of the compound (1-7), and the above formulas (2-1a), (2-1b), (2-1b) as a bicolor dye.
  • composition for protective layer contains 3 parts by mass of polyvinyl alcohol resin powder (manufactured by Kuraray Co., Ltd., average degree of polymerization 18000, trade name: KL-318) and polyamide epoxy resin (crosslinking agent, Sumitomo) with respect to 100 parts by mass of water. Prepared by mixing with 1.5 parts by mass of Kuraray Chemtex Co., Ltd., trade name: SR650 (30)).
  • the base film was corona-treated.
  • the conditions for corona treatment were an output of 0.3 kW and a processing speed of 3 m / min.
  • the composition for forming an alignment film was applied onto the base film by the bar coating method, and dried by heating in a drying oven at 80 ° C. for 1 minute.
  • the obtained dry film was subjected to polarized UV irradiation treatment to form a first alignment film.
  • the light emitted from the UV irradiation device (SPOT CURE SP-7; manufactured by Ushio, Inc.) is transmitted through a wire grid (UIS-27132 ##, manufactured by Ushio, Inc.) to have a wavelength of 365 nm.
  • the test was performed under the condition that the integrated light amount measured in 1 was 100 mJ / cm 2 .
  • the thickness of the first alignment film was 100 nm.
  • the composition for forming a polarizer layer was applied onto the formed first alignment film by a bar coating method, heated and dried in a drying oven at 120 ° C. for 1 minute, and then cooled to room temperature.
  • a polarizer layer was formed by irradiating the dry 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 polarizing element layer was measured with a laser microscope (OLS3000 manufactured by Olympus Corporation) and found to be 1.8 ⁇ m. In this way, a laminate composed of "base film / first alignment film / polarizer layer" was obtained.
  • the composition for the protective layer (OC layer) was applied onto the formed polarizer layer by the bar coating method, coated so that the thickness after drying was 1.0 ⁇ m, and dried at a temperature of 80 ° C. for 3 minutes. In this way, a laminate composed of "base film / first alignment film / polarizer layer / protective layer (OC layer)" was obtained.
  • Base film A polyethylene terephthalate (PET) film (thickness 100 ⁇ m) was prepared as a base film.
  • the alignment film forming composition As the alignment film forming composition, the alignment film forming composition according to the above ⁇ Laminated body composed of "base film / first alignment film / polarizer layer / protective layer (OC layer)"> is used. There was.
  • composition for forming a retardation layer Each of the components shown below was mixed, and the obtained mixture was stirred at 80 ° C. for 1 hour to obtain a composition for forming a retardation layer.
  • Compound b-1 represented by the following formula: 80 parts by mass
  • Polymerization initiator (Irgacure369, 2-dimethylamino-2-benzyl-1- (4-morpholinophenyl) butane-1-one, manufactured by BASF Japan Ltd.): 6 parts by mass leveling agent (BYK-361N, polyacrylate compound, BYK) -Chemie): 0.1 parts by mass Solvent (cyclopentanone): 400 parts by mass
  • the composition for forming an alignment film was applied onto the base film by the bar coating method, and dried by heating in a drying oven at 80 ° C. for 1 minute.
  • the obtained dry film was subjected to polarized UV irradiation treatment to form a second alignment film.
  • the polarized UV treatment was carried out under the condition that the integrated light amount measured at a wavelength of 365 nm was 100 mJ / cm 2 using the above UV irradiation device. Further, the polarization direction of the polarized UV was set to 45 ° with respect to the absorption axis of the polarizing layer. In this way, a laminate made of a "base film / second alignment film” was obtained.
  • the thickness of the second alignment film was 100 nm.
  • the composition for forming a retardation layer is applied to the second alignment film of the laminate composed of the "base film / second alignment film” by the bar coating method, and after heating and drying in a drying oven at 120 ° C. for 1 minute, It was cooled to room temperature.
  • a retardation layer was formed by irradiating the obtained dry film with ultraviolet rays having an integrated light intensity of 1000 mJ / cm 2 (365 nm standard) using the above UV irradiation device.
  • the thickness of the obtained retardation layer was measured with a laser microscope (OLS3000 manufactured by Olympus Corporation) and found to be 2.0 ⁇ m.
  • the retardation layer was a ⁇ / 4 plate showing a retardation value of ⁇ / 4 in the in-plane direction. In this way, a laminate composed of "base film / second alignment film / retardation layer" was obtained.
  • ⁇ Phase difference film> As the retardation film, a 1/4 wave plate (“Zeonoa film”, Nippon Zeon Corporation) having a thickness of 20 ⁇ m, which is a uniaxially stretched film of a cyclic olefin resin, was prepared.
  • Adhesive Composition A 81.8 parts by mass of acetone, 98.6 parts by mass of butyl acrylate, 0.4 parts by mass of acrylic acid, and 2-hydroxyethyl acrylate 1 in a reactor equipped with a cooling tube, a nitrogen introduction tube, a thermometer and a stirrer. A mixed solution of 0.0 parts by mass was charged, and the internal temperature was raised to 55 ° C. while replacing the air in the apparatus with nitrogen gas to make it oxygen-free. Then, a total amount of a solution prepared by dissolving 0.14 parts by mass of azobisisobutyronitrile (polymerization initiator) in 10 parts by mass of acetone was added.
  • the internal temperature was 54 to 54 while continuously adding acetone to the reactor at an addition rate of 17.3 parts by mass / hr so that the concentration of the acrylic resin excluding the monomer became 35%.
  • the temperature was kept at 56 ° C. for 12 hours, and finally ethyl acetate was added to adjust the acrylic resin solution A so that the concentration of the acrylic resin was 20%.
  • Non-volatile content of acrylic resin solution A Acrylic resin: 100 parts by mass Isocyanate compound: 0.4 parts by mass Silane compound: 0.5 parts by mass was mixed. Ethyl acetate was added so that the total solid content concentration became 10% to obtain a pressure-sensitive adhesive composition A.
  • an ethyl acetate solution (solid content concentration 75%) of a trimethylolpropane adduct of tolylene diisocyanate (“Coronate L” manufactured by Tosoh Corporation) was used.
  • silane compound 3-glycidoxypropyltrimethoxysilane (manufactured by Shin-Etsu Chemical Co., Ltd., "KBM403”) was used.
  • the obtained pressure-sensitive adhesive composition A is applied to the release-treated surface of a polyethylene terephthalate film (light release film B, thickness 38 ⁇ m) that has been release-treated so that the thickness after drying is 40 ⁇ m using an applicator. Then, it was dried at 100 ° C. for 1 minute to obtain a film having an adhesive layer. Then, another release-treated polyethylene terephthalate film (heavy release film A, 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 to produce an adhesive sheet "A40".
  • the adhesive sheet "A25” was produced in the same manner as "A40” except that it was applied so that the thickness after drying was 25 ⁇ m.
  • the adhesive sheet "A15” was produced in the same manner as "A40” except that it was applied so that the thickness after drying was 15 ⁇ m.
  • Adhesive Composition B Same as acrylic resin solution A except that the monomer composition was changed to 78.6 parts of butyl acrylate, 20 parts of methyl methacrylate, 0.4 parts of acrylic acid, and 1.0 part of 2-hydroxyethyl acrylate. Acrylic resin solution B was obtained.
  • Non-volatile content of acrylic resin solution B Acrylic resin: 100 parts by mass Isocyanate compound: 0.5 parts by mass Silane compound: 0.5 parts by mass was mixed. Ethyl acetate was added so that the total solid content concentration became 10% to obtain a pressure-sensitive adhesive composition B.
  • the isocyanate-based compound and the silane-based compound the same ones used in the pressure-sensitive adhesive composition A were used.
  • Adhesive sheets “B40”, “B25”, “B15” Adhesive sheets “B40”, “B25”, “B15” having a thickness of the adhesive layer of 40 ⁇ m, 25 ⁇ m, and 15 ⁇ m after drying in the same manner as the adhesive sheet “A40” except that the adhesive composition B is used. was produced.
  • Adhesive Composition C Same as acrylic resin solution A except that the monomer composition was changed to 61.0 parts of butyl acrylate, 37 parts of methyl methacrylate, 1.0 part of acrylic acid, and 1.0 part of 2-hydroxyethyl acrylate. Acrylic resin solution C was obtained.
  • Non-volatile content of acrylic resin solution C Acrylic resin: 100 parts by mass Isocyanate compound: 3.0 parts by mass Silane compound: 0.5 parts by mass was mixed. Ethyl acetate was added so that the total solid content concentration became 10% to obtain a pressure-sensitive adhesive composition C.
  • the isocyanate-based compound and the silane-based compound the same ones used in the pressure-sensitive adhesive composition A were used.
  • Adhesive sheets “C25”, “C15”, “C05” Adhesive sheets “C25”, “C15”, “C05” having a thickness of the adhesive layer of 25 ⁇ m, 15 ⁇ m, and 5 ⁇ m after drying in the same manner as the adhesive sheet “A40” except that the adhesive composition C is used. was produced.
  • Evaluation parameter A storage elastic modulus / layer thickness
  • the thickness of the pressure-sensitive adhesive layer was measured using a contact-type film thickness measuring device (“MS-5C” manufactured by Nikon Corporation). However, the polarizer layer and the alignment film were measured using a laser microscope (“OLS3000” manufactured by Olympus Corporation).
  • the storage elastic modulus of the pressure-sensitive adhesive layer at a temperature of 25 ° C. was measured using a viscoelasticity measuring device (MCR-301, Antonio Par). Each adhesive sheet having a thickness of 25 ⁇ m was cut into a width of 30 mm and a length of 30 mm. After peeling off the release film, laminating a plurality of sheets so as to have a thickness of 150 ⁇ m and joining them to a glass plate, the frequency is 1.0 Hz and the deformation amount is 1% in the temperature range of -20 ° C to 100 ° C in a state of being adhered to the measurement chip. The measurement was carried out under the condition of a temperature rising rate of 5 ° C./min, and the storage elastic modulus at a temperature of 25 ° C. was confirmed.
  • a window film As a window film as a front plate, a polyimide film (HC-PI film, overall thickness: 70 ⁇ m, tensile elastic modulus 5.6 GPa) having a hard coat layer on one side was prepared.
  • HC-PI film overall thickness: 70 ⁇ m, tensile elastic modulus 5.6 GPa
  • a back plate As a back plate, a polyethylene terephthalate (PET) substrate (thickness 38 ⁇ m, tensile elastic modulus 4.5 GPa) was prepared.
  • PET polyethylene terephthalate
  • the tensile elastic modulus of the front plate and the back plate was measured as follows. A rectangular small piece having a long side of 110 mm and a short side of 10 mm was cut out from the front plate or the back plate using a super cutter. Next, the upper and lower grippers of a tensile tester (manufactured by Shimadzu Corporation, Autograph AG-Xplus tester) sandwich both ends of the measurement sample in the long side direction so that the gap between the grippers is 5 cm, and the temperature is 23 ° C.
  • a tensile tester manufactured by Shimadzu Corporation, Autograph AG-Xplus tester
  • the measurement sample was pulled in the length direction of the measurement sample at a tensile speed of 4 mm / min, and from the slope of a straight line between 20 and 40 MPa in the obtained stress-strain curve, 23 ° C., relative The tensile elastic modulus at a humidity of 55% was calculated. At this time, the thickness for calculating the stress was measured by the method described above.
  • the heavy release film A was peeled from the laminate A1 and bonded to the retardation film which is a retardation layer to obtain a laminate A2.
  • the bonded surface was previously subjected to double-sided corona treatment (output 0.3 kW, speed 3 m / min).
  • the light release film B was peeled off from the adhesive sheet "C15" and bonded to the retardation layer side of the laminate A2 to obtain the laminate A3.
  • the bonded surface was previously subjected to double-sided corona treatment (output 0.3 kW, speed 3 m / min).
  • the light release film B was peeled off from the adhesive sheet "A25" and bonded to the side of the front plate having no hard coat layer to obtain a laminated body A4.
  • the bonded surface was previously subjected to double-sided corona treatment (output 0.3 kW, speed 3 m / min).
  • the heavy release film A was peeled from the laminate A4 and bonded to the base film side of the laminate A3 to obtain the laminate A5.
  • the bonded surface was previously subjected to double-sided corona treatment (output 0.3 kW, speed 3 m / min).
  • the heavy release film A was peeled from the laminate A5 and bonded to the back plate to obtain the laminate of Example 1-1 as shown in FIG.
  • the front plate is the first protective layer 10
  • the adhesive layer under the front plate is the first adhesive layer 11
  • the base film is the base layer 15, and the protective layer (OC layer) is interposed from the first alignment film.
  • the coating layer 12 the pressure-sensitive adhesive layer under the protective layer (OC layer) is the second pressure-sensitive adhesive layer 13
  • the back plate from the retardation layer is the second protective layer 14.
  • Example 1-2 A laminate of Example 1-2 was obtained in the same manner as in Example 1-1 except that "C05" was used instead of the adhesive sheet "C15".
  • Table 2 summarizes the pressure-sensitive adhesive layers used in the laminates of Examples 1-1 and 1-2 and Comparative Examples 1-1, 1-2 and 1-3.
  • the values of "A1 + A2", “A2-A1", and “A2” are as shown in Table 2.
  • Table 2 shows the results of the flexibility test of the laminated body.
  • FIG. 4 is a diagram schematically showing the method of this evaluation test. As shown in FIG. 4, two individually movable mounting tables 501 and 502 are arranged so that the gap C is 2 mm (bending radius 1 mm), and the center in the width direction is located at the center of the gap C. And the laminated body was fixedly arranged so that the first protective layer was located on the upper side (FIG. 4 (a)).
  • the two mounting tables 501 and 502 were rotated 90 degrees upward with the positions P1 and P2 as the centers of the rotation axes, and a bending force was applied to the region of the laminated body corresponding to the gap C of the mounting tables (FIG. 4 (b)). After that, the two mounting tables 501 and 502 were returned to their original positions (FIG. 4 (a)). After completing the above series of operations, the number of times the bending force was applied was counted as one. After repeating this at a temperature of 25 ° C., it was confirmed whether or not cracks were generated in the coating layer in the region corresponding to the gap C of the mounting tables 501 and 502 of the laminated body.
  • the moving speed of the mounting tables 501 and 502 and the pace of application of the bending force were set to the same conditions in the evaluation test for all the laminated bodies.
  • D A crack occurred when the number of times the bending force was applied was less than 100,000.
  • the heavy release film A was peeled from the laminate B1 and bonded to the retardation layer side of the laminate composed of the "base film / second alignment film / retardation layer" to obtain the laminate B2.
  • the bonded surface was previously subjected to double-sided corona treatment (output 0.3 kW, speed 3 m / min).
  • the light release film B was peeled from the adhesive sheet "C15", and the base film used for forming the retardation layer and the second alignment film were bonded to the peeled surface from the laminate B2 to obtain the laminate B3. ..
  • the bonded surface was previously subjected to double-sided corona treatment (output 0.3 kW, speed 3 m / min).
  • the light release film B was peeled off from the adhesive sheet "A25" and bonded to the side of the front plate having no hard coat layer to obtain a laminated body B4.
  • the bonded surface was previously subjected to double-sided corona treatment (output 0.3 kW, speed 3 m / min).
  • the heavy release film A was peeled from the laminate B4 and bonded to the base film side of the laminate B3 to obtain the laminate B5.
  • the bonded surface was previously subjected to double-sided corona treatment (output 0.3 kW, speed 3 m / min).
  • the heavy release film A was peeled from the laminate B5 and bonded to the back plate to obtain the laminate of Example 2-1 as shown in FIG.
  • the front plate is the first protective layer 10
  • the adhesive layer under the front plate is the first adhesive layer 11
  • the base film is the base layer 15, and the protective layer (OC layer) is interposed from the first alignment film.
  • the coating layer 12 the pressure-sensitive adhesive layer under the protective layer (OC layer) is the second pressure-sensitive adhesive layer 13
  • the back plate from the retardation layer is the second protective layer 14.
  • Example 2-2 A laminate of Example 2-2 was obtained in the same manner as in Example 2-1 except that "C05" was used instead of the adhesive sheet "C15".
  • Table 3 summarizes the pressure-sensitive adhesive layers used in the laminates of Examples 2-1 and 2-2 and Comparative Examples 2-1 and 2-2 and 2-3.
  • the values of "A1 + A2", “A2-A1", and “A2” are as shown in Table 3.
  • Table 3 shows the results of the flexibility test of the laminated body.

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

Abstract

L'objectif de la présente invention est de produire un corps stratifié dans lequel l'apparition de fissures dans une couche de revêtement provoquées par une courbure a été supprimée, et un dispositif d'affichage équipé de celui-ci. La présente invention concerne un corps stratifié comprenant une première couche protectrice, une première couche adhésive, une couche de matériau de base, une couche de revêtement intercalée, une seconde couche adhésive et une seconde couche protectrice, dans cet ordre, chacune des couches étant en contact les unes avec les autres. Lorsque G'1 (kPa) est le module de conservation pour la première couche adhésive à une température de 25 °C, G'2 (kPa) est le module de conservation pour la seconde couche adhésive à une température de 25 °C, a1 (µm) est l'épaisseur de la première couche adhésive, et a2 (µm) est l'épaisseur de la seconde couche adhésive, les paramètres d'évaluation A1 et A2 représentés par la formule (1) et la formule (2) satisfont les relations dans la formule (3), la formule (4) et la formule (5). (1)A1 = G'1/a1 (2)A2 = G'2/a2 (3)A1+A2 ≤ 230 4)A2-A1 ≥ 0 (5)A2 ≥ 34
PCT/JP2020/008303 2019-03-26 2020-02-28 Corps stratifié et dispositif d'affichage WO2020195541A1 (fr)

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CN202080023261.9A CN113613880A (zh) 2019-03-26 2020-02-28 层叠体和显示装置

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JP2019058916A JP2020157578A (ja) 2019-03-26 2019-03-26 積層体及び表示装置
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JP2016130747A (ja) * 2014-12-25 2016-07-21 日東電工株式会社 粘着剤層付偏光フィルムおよび画像表示装置
JP2017016084A (ja) * 2015-06-30 2017-01-19 住友化学株式会社 偏光板、液晶パネル及び液晶表示装置

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JP5098593B2 (ja) * 2006-12-04 2012-12-12 住友化学株式会社 楕円偏光板及び液晶表示装置
JP5930636B2 (ja) * 2011-09-27 2016-06-08 住友化学株式会社 偏光板
JP6488125B2 (ja) * 2013-12-26 2019-03-20 日東電工株式会社 積層偏光フィルム、その製造方法、積層光学フィルムおよび画像表示装置
WO2017057615A1 (fr) * 2015-10-02 2017-04-06 日東電工株式会社 Composition adhésive de type durcissable pour film de polarisation et son procédé de fabrication, film de polarisation et son procédé de fabrication, film optique et dispositif d'affichage d'image
JP6830753B2 (ja) * 2015-10-02 2021-02-17 日東電工株式会社 積層体、タッチパネル、積層体形成キット、及び、透明導電性フィルムの屈曲耐性を向上する方法
KR20170053039A (ko) * 2015-11-05 2017-05-15 스미또모 가가꾸 가부시키가이샤 편광판 및 이를 포함하는 화상 표시 장치
JP6324366B2 (ja) * 2015-12-21 2018-05-16 住友化学株式会社 偏光板
JP6232486B2 (ja) * 2016-01-19 2017-11-15 住友化学株式会社 光学積層体の製造方法
JP7042020B2 (ja) 2016-08-15 2022-03-25 日東電工株式会社 フレキシブル画像表示装置用積層体、及び、フレキシブル画像表示装置
JP6850601B2 (ja) 2016-12-21 2021-03-31 日東電工株式会社 画像表示装置

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JP2016130747A (ja) * 2014-12-25 2016-07-21 日東電工株式会社 粘着剤層付偏光フィルムおよび画像表示装置
JP2017016084A (ja) * 2015-06-30 2017-01-19 住友化学株式会社 偏光板、液晶パネル及び液晶表示装置

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