WO2019031064A1 - Corps stratifié et écran tactile - Google Patents

Corps stratifié et écran tactile Download PDF

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Publication number
WO2019031064A1
WO2019031064A1 PCT/JP2018/023118 JP2018023118W WO2019031064A1 WO 2019031064 A1 WO2019031064 A1 WO 2019031064A1 JP 2018023118 W JP2018023118 W JP 2018023118W WO 2019031064 A1 WO2019031064 A1 WO 2019031064A1
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Prior art keywords
meth
sensitive adhesive
layer
pressure
adhesive layer
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PCT/JP2018/023118
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English (en)
Japanese (ja)
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雄也 米川
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綜研化学株式会社
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Priority to JP2019535007A priority Critical patent/JP7029456B2/ja
Priority to CN201880051251.9A priority patent/CN110997320A/zh
Priority to KR1020207004007A priority patent/KR102603519B1/ko
Publication of WO2019031064A1 publication Critical patent/WO2019031064A1/fr

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    • 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
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B32B27/365—Layered products comprising a layer of synthetic resin comprising polyesters comprising polycarbonates
    • 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
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • 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
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/16—Nitrogen-containing compounds
    • C08K5/29—Compounds containing one or more carbon-to-nitrogen double bonds
    • 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
    • C09J133/04—Homopolymers or copolymers of esters
    • C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means

Definitions

  • the present invention relates to a laminate and a touch panel.
  • the touch panel is a laminate of various materials, and an adhesive is used for laminating various materials (see Patent Documents 1 and 2).
  • Polycarbonate is often used as a material of the support and the cover member (surface support) of the touch panel.
  • Polycarbonate contains moisture due to the reason for its production process, and when the pressure-sensitive adhesive sheet is attached to a polycarbonate plate and placed in a durability test (for example, evaluation test of blister resistance and whitening resistance), foaming derived from this moisture Will occur.
  • An object of the present invention is a laminate having a polycarbonate plate with high water absorption ability and other layers via an adhesive layer, and a laminate excellent in blister resistance and whitening resistance under high durability conditions. It is to provide.
  • the present inventors diligently studied to solve the above problems. As a result, it has been found that a laminate having the following constitution can solve the above-mentioned problems, and the present invention has been completed.
  • the present invention relates to, for example, the following [1] to [3].
  • the first layer and the second layer are a laminate formed by laminating through the adhesive layer, and the second layer is left for 72 hours under the environment of 85 ° C./85% RH.
  • Weight ratio (weight after standing / weight before standing) of the polycarbonate sheet is 1.0010 to 1.0050
  • the pressure-sensitive adhesive layer contains a polymerizable macromonomer and a crosslinkable functional group-containing monomer.
  • a touch panel including the laminate according to the above [1] or [2].
  • the present invention is a laminate having a polycarbonate plate with high water absorption ability and another layer via the pressure-sensitive adhesive layer, and a laminate excellent in blister resistance and whitening resistance under high durability conditions. Can be provided.
  • FIG. 1 is a cross-sectional view schematically showing an example of a touch panel unit in a resistive film type touch panel.
  • FIG. 2 is a cross-sectional view schematically showing an example of a touch panel unit in a capacitive touch panel.
  • the first layer and the second layer are laminated via the pressure-sensitive adhesive layer.
  • the laminate of the present invention has the first layer, the pressure-sensitive adhesive layer, and the second layer in this order in the stacking direction.
  • the second layer is a polycarbonate plate having a weight ratio (weight after standing / weight before standing) of 1.0010 to 1.0050 before and after standing for 72 hours in an 85 ° C./85% RH environment. is there.
  • the pressure-sensitive adhesive layer has a (meth) acrylic copolymer (A) which is a copolymer of monomer components including a polymerizable macromonomer and a crosslinkable functional group-containing monomer, and an alkyleneoxy group having a carbon number of 2 or more. It forms from the adhesive composition containing an isocyanate type crosslinking agent (B).
  • polyester eg, polyethylene terephthalate (PET), polyethylene naphthalate (PEN)), polycarbonate (PC), polymethyl methacrylate (PMMA), polyethylene, polypropylene, polyvinyl chloride, polyurethane, polyamide And plastic films such as acrylonitrile-butadiene-styrene copolymer and ethylene-vinyl acetate copolymer; glass plate; transparent conductive film described later; plastic film with transparent conductive film; and glass plate with transparent conductive film.
  • PET polyethylene terephthalate
  • PEN polyethylene naphthalate
  • PC polycarbonate
  • PMMA polymethyl methacrylate
  • polyethylene polypropylene
  • polyvinyl chloride polyvinyl chloride
  • polyurethane polyurethane
  • polyamide And plastic films such as acrylonitrile-butadiene-styrene copolymer and ethylene-vinyl acetate copolymer
  • glass plate transparent conductive film described later
  • the first layer is, for example, a layer constituting a touch panel unit described later.
  • the first layer is, for example, an optical film including a polarizing plate.
  • a polarizing plate one in which an appropriate transparent protective film is bonded to one side or both sides of a polarizer is generally used.
  • the transparent protective film include cellulose resins, cyclic polyolefin resins, (meth) acrylic resins, phenyl maleimide resins, and polycarbonate resins.
  • the first layer may be, for example, the substrate derived from a pressure-sensitive adhesive sheet having a substrate and a pressure-sensitive adhesive layer formed on one surface of the substrate.
  • the substrate include the plastic films.
  • the pressure-sensitive adhesive layer is formed of the above-mentioned pressure-sensitive adhesive composition containing a (meth) acrylic copolymer (A) and an isocyanate-based crosslinking agent (B) having an alkyleneoxy group having 2 or more carbon atoms.
  • the thickness of the first layer is usually 5 to 1000 ⁇ m, preferably 10 to 500 ⁇ m.
  • the second layer is a polycarbonate plate (hereinafter also referred to as "PC plate").
  • the weight ratio (weight after standing / weight before standing) of the PC plate before and after being left standing for 72 hours in an 85 ° C./85% RH environment is 1.0010 to 1.0050, preferably It is from 1.0015 to 1.0040, more preferably from 1.0018 to 1.0035.
  • the weight ratio is a value defined and measured as follows.
  • the PC board is left to stand in a dry environment at 85 ° C. for 72 hours, and its weight (weight 1: weight before leaving in a wet heat environment) is measured immediately after taking it out of the environment.
  • the PC board is left to stand in an environment of 85 ° C./85% RH for 72 hours, and its weight (weight 2: weight after standing in a wet heat environment) is measured immediately after taking it out of the environment.
  • the weight ratio (weight 2 / weight 1) is calculated from the weights 1 and 2 before and after the 85 ° C./85% RH environment addition.
  • the conventional laminate if the water absorption capacity of the PC board is low and the weight ratio is less than 1.0010, there is no problem in the durability test, but the water absorption capacity of the PC board is high and the weight ratio is 1.0010 If it is above, blisters and whitening may occur in the durability test.
  • the laminate of the present invention the blister resistance and the whitening resistance are excellent even if the weight ratio of the PC plate is 1.0010 or more. This is because the pressure-sensitive adhesive layer constituting the laminate of the present invention is easy to absorb water and has high elasticity sufficient to suppress the occurrence of blistering.
  • the density of the PC plate is usually 1.000 to 1.120 g / cm 3 , preferably 1.050 to 1.110 g / cm 3 , and more preferably 1.080 to 1.100 g / cm 3 .
  • the density of the PC plate is more than 1.120 g / cm 3 , there is no problem in the durability test, but if the density is 1.120 g / cm 3 or less, blistering or whitening occurs in the durability test. It may occur.
  • the laminate of the present invention even when the density of the PC plate is 1.120 g / cm 3 or less, the occurrence of blistering, whitening and the like in the durability test is suppressed.
  • the second layer is, for example, a PC board as a transparent member constituting a touch panel unit described later.
  • the second layer is, for example, a PC board to which an optical film is attached via the pressure-sensitive adhesive layer.
  • the thickness of the PC board is usually 0.3 to 3 mm, preferably 0.5 to 2 mm.
  • the pressure-sensitive adhesive layer comprises a (meth) acrylic copolymer (A) described below and an isocyanate crosslinking agent (B) having an alkyleneoxy group having 2 or more carbon atoms (hereinafter referred to simply as “isocyanate crosslinking agent (B (Also referred to as ”)" is formed from a pressure-sensitive adhesive composition containing
  • the pressure-sensitive adhesive composition By using the pressure-sensitive adhesive composition, it is possible to form a pressure-sensitive adhesive layer having blister resistance and whitening resistance even under high durability conditions and having good adhesion to the first and second layers. it can.
  • the (meth) acrylic copolymer (A) is a copolymer of a monomer component containing a polymerizable macromonomer and a crosslinkable functional group-containing monomer, and is obtained by copolymerizing the above-mentioned monomer component.
  • the monomer component is usually a polymerizable unsaturated group-containing monomer.
  • the monomer component comprises a polymerizable macromonomer.
  • the polymerizable macromonomer has a polymerizable unsaturated group.
  • the polymerizable unsaturated group includes, for example, an ethylenically unsaturated double bond.
  • One example is a polymer having a (meth) acryloyl group at an end.
  • the polymerizable macromonomer is, for example, subjected to a radical polymerization reaction with another monomer forming the (meth) acrylic copolymer (A) in the polymerizable unsaturated group at the time of the polymerization of the monomer component to obtain a (meth) acrylic resin. It is incorporated into the copolymer (A).
  • the side chain based on a polymerizable macromonomer will be formed. The side chains prevent the molecules of the (meth) acrylic copolymer (A) from being densely packed.
  • the polymerizable macromonomer is, for example, a polymer having a weight average molecular weight (Mw) of usually 500 to 100,000, preferably 1,000 to 50,000.
  • Mw weight average molecular weight
  • the weight average molecular weight (Mw) of the polymerizable macromonomer is a weight average molecular weight in terms of standard polystyrene measured by gel permeation chromatography (GPC).
  • the polymerizable macromonomer preferably has a glass transition temperature (Tg) of 50 to 180 ° C., more preferably 80 to 150 ° C.
  • Tg glass transition temperature
  • the Tg of the polymerizable macromonomer may adopt a value obtained from the Fox equation, and when using a commercial product, it may adopt a catalog described value.
  • Examples of the monomer of the polymer chain (main chain) portion constituting the polymerizable macromonomer include methyl (meth) acrylate, ethyl (meth) acrylate, n-butyl (meth) acrylate, iso-butyl (meth) acrylate and and alkyl (meth) acrylates such as tert-butyl (meth) acrylate, and the carbon number of the alkyl group is preferably 1 to 20, and (meth) acrylonitrile; styrene such as styrene and ⁇ -methylstyrene Also included are system monomers. The monomers may be used alone or in combination of two or more.
  • the polymerizable macromonomer is preferably, for example, a (meth) acrylic macromonomer, a (meth) acrylonitrile macromonomer, and a styrenic macromonomer, and can be produced according to various known methods. It can be manufactured by the method described in paragraph [0039] of the 018227 gazette.
  • the polymerizable macromonomer a commercially available product may be used.
  • a macromonomer whose main chain constituting monomer is methyl methacrylate product name: 45% AA-6 (AA-6S), AA-6; manufactured by Toagosei Co., Ltd.)
  • a macromonomer product name: AN-6S; manufactured by Toagosei Co., Ltd.
  • a macromonomer whose main chain constituting monomer is butyl acrylate
  • product name: AB-6 And the terminal is a methacryloyl group.
  • the polymerizable macromonomer may be used alone or in combination of two or more.
  • the amount of the polymerizable macromonomer in the total monomer component is usually 1 to 35% by mass, preferably 2 to 33% by mass, more preferably 5 to 30% by mass.
  • the amount of structural units derived from a polymerizable macromonomer is within the range described in the present paragraph among all structural units derived from monomers.
  • blister expansion is excellent by suppressing expansion of the foam at the interface between the first and second layers and the pressure-sensitive adhesive layer, and adhesion between these layers is also excellent.
  • the structural unit amount can be calculated, for example, from the monomer charge amount, and the same applies to the other examples.
  • the monomer component contains a crosslinkable functional group-containing monomer.
  • the crosslinkable group is a functional group capable of undergoing a crosslinking reaction with the isocyanate crosslinking agent (B), and examples thereof include a hydroxyl group and an acid group.
  • examples of the crosslinkable functional group-containing monomer include a hydroxyl group-containing monomer and an acid group-containing monomer, and among these, a hydroxyl group-containing monomer is preferable.
  • hydroxyl group-containing monomer examples include a hydroxyl group-containing (meth) acrylate, and specifically, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate And hydroxyalkyl (meth) acrylates such as 6-hydroxyhexyl (meth) acrylate and 8-hydroxyoctyl (meth) acrylate.
  • a carboxyl group As an acid group, a carboxyl group, an acid anhydride group, a phosphoric acid group, a sulfuric acid group is mentioned, for example.
  • a carboxyl group-containing monomer for example, (meth) acrylic acid ⁇ -carboxyethyl, (meth) acrylic acid 5-carboxypentyl, succinic acid mono (meth) acryloyl oxyethyl ester, ⁇ -carboxy polycaprolactone mono (meth) acrylate Etc .; (meth) acrylic acid, itaconic acid, crotonic acid, fumaric acid and maleic acid.
  • acid group-containing monomers other than carboxyl groups include acid anhydride group-containing monomers such as phthalic anhydride and maleic anhydride; phosphoric acid group-containing monomers such as (meth) acrylic monomers having a phosphoric acid group in the side chain And sulfuric acid group-containing monomers such as (meth) acrylic monomers having a sulfuric acid group in the side chain.
  • the pressure-sensitive adhesive layer formed of the pressure-sensitive adhesive composition is a wiring made of metal or metal oxide
  • substantially no acid group-containing monomer that is, the (meth) acrylic copolymer (A) preferably has substantially no acid group.
  • substantially having no acid group means, for example, that the acid value of the (meth) acrylic copolymer (A) is 0.5 mg KOH / g or less.
  • hydroxyl group-containing monomers are preferable. At least a part of the hydroxyl group derived from the hydroxyl group-containing monomer becomes a crosslinking point in the (meth) acrylic copolymer (A), and for example, reacts with the isocyanate group of the isocyanate crosslinking agent (B) to form a crosslinked structure can do.
  • the crosslinkable functional group-containing monomer may be used alone or in combination of two or more.
  • the amount of the crosslinkable functional group-containing monomer in the total monomer component is usually 0.5 to 20% by mass, preferably 1.5 to 15% by mass, more preferably 2 to 13% by mass.
  • the amount of structural units derived from a crosslinkable functional group containing monomer is in the said range of this paragraph description in all the structural units derived from a monomer.
  • the crosslinked structure of the (meth) acrylic copolymer (A) is appropriately formed, and a pressure-sensitive adhesive layer having appropriate flexibility can be obtained.
  • the monomer component preferably contains an alkoxyalkyl (meth) acrylate.
  • the monomer component preferably contains an alkoxyalkyl (meth) acrylate.
  • the carbon number of the alkoxyalkyl group in the alkoxyalkyl (meth) acrylate is usually 2 to 18, preferably 2 to 12, and more preferably 2 to 10.
  • Examples of the alkoxyalkyl (meth) acrylate include methoxymethyl (meth) acrylate, 2-methoxyethyl (meth) acrylate, 2-ethoxyethyl (meth) acrylate, 3-methoxypropyl (meth) acrylate, 3-ethoxypropyl (3-ethoxypropyl (meth) acrylate Mention may be made of meta) acrylate, 4-methoxybutyl (meth) acrylate, 4-ethoxybutyl (meth) acrylate.
  • the alkoxyalkyl (meth) acrylates may be used alone or in combination of two or more.
  • the amount of alkoxyalkyl (meth) acrylate in all the monomer components is usually 50 to 98% by mass, preferably 55 to 95% by mass, more preferably 60 to 90% by mass.
  • the amount of structural units derived from an alkoxy alkyl (meth) acrylate is in the said range of this paragraph description in all the structural units derived from a monomer.
  • the alkoxy group has hydrophilicity, so that the water which has entered the pressure-sensitive adhesive layer is dispersed to increase the blister resistance and the whitening resistance;
  • the adhesion between the first and second layers and the pressure-sensitive adhesive layer is excellent when the upper limit value or less.
  • the monomer component may further contain another monomer other than the monomer.
  • monomers other than the above-mentioned monomer for example, alkyl (meth) acrylate, alicyclic hydrocarbon group or aromatic hydrocarbon group containing (meth) acrylate, alkoxy polyalkylene glycol mono (meth) acrylate, styrenic monomer, Examples include amide group-containing monomers, amino group-containing monomers, cyano group-containing monomers, and vinyl acetate.
  • the carbon number of the alkyl group in the alkyl (meth) acrylate is preferably 1 to 20.
  • alkyl (meth) acrylates include methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, iso-propyl (meth) acrylate, n-butyl (meth) acrylate, iso-butyl Meta) acrylate, tert-butyl (meth) acrylate, pentyl (meth) acrylate, hexyl (meth) acrylate, heptyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, n-octyl (meth) acrylate, iso-octyl (iso) Meta) acrylate, nonyl (meth) acrylate, iso-nonyl (meth) acrylate, decyl (me
  • Examples of the alicyclic hydrocarbon group or aromatic hydrocarbon group-containing (meth) acrylate include cyclohexyl (meth) acrylate, isobornyl (meth) acrylate, adamantyl (meth) acrylate, benzyl (meth) acrylate and phenyl (meth) acrylate. And acrylate and phenoxyethyl (meth) acrylate.
  • alkoxypolyalkylene glycol mono (meth) acrylate for example, methoxydiethylene glycol mono (meth) acrylate, methoxydipropylene glycol mono (meth) acrylate, ethoxytriethylene glycol mono (meth) acrylate, ethoxydiethylene glycol mono (meth) acrylate, Methoxy triethylene glycol mono (meth) acrylate is mentioned.
  • styrene-based monomers examples include styrene; alkylstyrenes such as methylstyrene, dimethylstyrene, trimethylstyrene, propylstyrene, butylstyrene, hexylstyrene, heptylstyrene, octylstyrene and the like; fluorostyrene, chlorostyrene, bromostyrene, dibromostyrene And halogenated styrenes; and functionalized styrenes such as nitrostyrene, acetylstyrene and methoxystyrene.
  • alkylstyrenes such as methylstyrene, dimethylstyrene, trimethylstyrene, propylstyrene, butylstyrene, hexylstyrene, heptyl
  • Examples of the amide group-containing monomer include N-alkyls such as (meth) acrylamide, N-methyl (meth) acrylamide, N-ethyl (meth) acrylamide, N-propyl (meth) acrylamide, N-hexyl (meth) acrylamide, etc. N, N-dialkyl (meth) acrylamides such as (meth) acrylamide, N, N-dimethyl (meth) acrylamide, N, N-diethyl (meth) acrylamide; N-vinyl pyrrolidone, N-vinyl caprolactam, (meth) acryloyl And nitrogen based heterocycle containing monomers such as morpholine.
  • N-alkyls such as (meth) acrylamide, N-methyl (meth) acrylamide, N-ethyl (meth) acrylamide, N-propyl (meth) acrylamide, N-hexyl (meth) acrylamide
  • amino group-containing monomer examples include N, N-dialkylaminoalkyl (meth) acrylates such as N, N-dimethylaminoethyl (meth) acrylate and N, N-diethylaminoethyl (meth) acrylate.
  • cyano group-containing monomers examples include cyano (meth) acrylate and (meth) acrylonitrile.
  • the other monomers may be used alone or in combination of two or more.
  • the amount of other monomers in the total monomer components is preferably 35% by mass or less. Further, the amount of structural units derived from other monomers is preferably 35% by mass or less in the total structural units derived from monomers.
  • the weight average molecular weight (Mw) of the (meth) acrylic copolymer (A) measured by gel permeation chromatography (GPC) method is usually 100,000 to 800,000, preferably 150,000 to 600,000. Preferably, it is 200,000 to 500,000. If it is such an aspect, the adhesive layer excellent in high temperature durability can be obtained.
  • the molecular weight distribution (Mw / Mn; Mn is a number average molecular weight) of the (meth) acrylic copolymer (A) is usually 1.5 to 15, preferably 2 to 13, and more preferably 5 to 12. If it is such an aspect, the adhesive layer excellent in high temperature durability can be obtained.
  • Mw and Mw / Mn can be measured, for example, by the methods described in the Examples.
  • the glass transition temperature (Tg) of the (meth) acrylic copolymer (A) determined by the so-called Fox equation is usually ⁇ 80 to 0 ° C., preferably ⁇ 70 to ⁇ 10 ° C.
  • Tg glass transition temperature
  • a pressure-sensitive adhesive layer having excellent adhesive strength at normal temperature (25 ° C.) can be obtained.
  • the compatibility with the first and second layers of the pressure-sensitive adhesive layer may be deteriorated, which may cause defects such as foaming and uki.
  • the glass transition temperature (Tg) of the homopolymer formed from each monomer in the Fox equation can be, for example, the value described in Polymer Handbook Fourth Edition (Wiley-Interscience 2003).
  • the total content of the (meth) acrylic copolymer (A) and the isocyanate crosslinking agent (B) in the pressure-sensitive adhesive composition is usually 70% by mass or more in 100% by mass of the solid content of the pressure-sensitive adhesive composition Preferably it is 75 mass% or more, More preferably, it is 80 mass% or more.
  • solid content is a component except a solvent.
  • the (meth) acrylic copolymer (A) can be produced by a known method, but is preferably produced by solution polymerization. Specifically, a monomer component and a polymerization solvent are charged in a reaction vessel, a polymerization initiator is added under an inert gas atmosphere such as nitrogen gas, and the reaction temperature is heated to about 50 to 90 ° C. to react for 2 to 20 hours Let Further, during the polymerization reaction, a polymerization initiator, a chain transfer agent, a monomer component, and a polymerization solvent may be added as appropriate.
  • polymerization initiator examples include common organic polymerization initiators. Specifically, peroxides such as benzoyl peroxide and lauroyl peroxide, and 2,2'-azobisisobutyronitrile etc. Azo compounds are mentioned. Among these, azo compounds are preferable.
  • azo compound for example, 2,2'-azobisisobutyronitrile, 2,2'-azobis (4-methoxy-2,4-dimethylvaleronitrile), 2,2'-azobis (2-cyclopropyl) Propionitrile), 2,2′-azobis (2,4-dimethylvaleronitrile), 2,2′-azobis (2-methylbutyronitrile), 1,1′-azobis (cyclohexane-1-carbonitrile) , 2- (carbamoylazo) isobutyronitrile, 2-phenylazo-4-methoxy-2,4-dimethylvaleronitrile, 2,2'-azobis (2-amidinopropane) dihydrochloride, 2,2'-azobis ( N, N'-dimethylene isobutyl amidine), 2,2'-azobis [2-methyl-N- (2-hydroxyethyl) -propionamide], 2,2'-azo Di (isobutylamido) dihydrate, 4,4'-azo
  • the polymerization initiator may be used alone or in combination of two or more.
  • the amount of the polymerization initiator used is usually 0.01 to 5 parts by mass with respect to 100 parts by mass of the monomer component.
  • the Mw of the (meth) acrylic copolymer (A) can be adjusted within an appropriate range.
  • a polymerization solvent for example, aromatic hydrocarbons such as benzene, toluene and xylene; aliphatic hydrocarbons such as n-pentane, n-hexane, n-heptane and n-octane; cyclopentane and cyclohexane Alicyclic hydrocarbons such as cycloheptane and cyclooctane; Ethers such as diethylether, diisopropylether, 1,2-dimethoxyethane, dibutylether, tetrahydrofuran, dioxane, anisole, phenylethylether and diphenylether; chloroform, carbon tetrachloride Halogenated hydrocarbons such as 1,2-dichloroethane and chlorobenzene; esters such as ethyl acetate, propyl acetate, butyl acetate and methyl propylene; esters such as
  • the isocyanate crosslinking agent (B) is a component capable of causing a crosslinking reaction with the (meth) acrylic copolymer (A).
  • the number of isocyanate groups in one molecule is preferably 2 to 8, more preferably 2 to 6.
  • the isocyanate crosslinking agent (B) has an alkyleneoxy group having 2 or more carbon atoms.
  • the "alkyleneoxy group” is a divalent group represented by -R-O-, and R is an alkanediyl group having 2 or more carbon atoms.
  • the upper limit of the carbon number of the alkyleneoxy group is usually 10, preferably 8.
  • reaction product of tolylene diisocyanate and trimethylolpropane has —CH 2 —O— but does not have an alkylene oxy group (divalent group) having 2 or more carbon atoms.
  • the alkyleneoxy group having a carbon number of 2 or more may be contained in the crosslinking agent (B) as a part of the ring-opened structure of a lactone as in the formula (3) described later, May be included.
  • an isocyanate-based crosslinking agent having a lactone modifying group and / or an alkylene oxide modifying group is preferable, and a compound obtained by modifying a polyhydric alcohol with lactone modification and / or alkylene oxide modification, a polyfunctional isocyanate compound having two or more molecules is a urethane Included are compounds having a linked structure.
  • the lactone modified group is a ring-opened structure of lactone
  • the alkylene oxide modified group is a ring-opened structure of alkylene oxide.
  • the isocyanate crosslinking agent (B) has an alkyleneoxy group having a carbon number of 2 or more, so the distance between crosslinking points becomes long.
  • the polymer component is hardened to enhance durability, the compatibility of the pressure-sensitive adhesive layer to the substrate and adherend tends to decrease, but the cross-linking agent (B) having a long distance between crosslinking points
  • the cross-linking agent (B) having a long distance between crosslinking points
  • the durability of the pressure-sensitive adhesive layer can be enhanced, and the crosslinking agent (B) having a long distance between crosslinking points is used.
  • This can prevent the decrease in the compatibility with the first and second layers due to the hardness of the copolymer (A). For this reason, even when a polycarbonate plate having high water absorption capacity is used, a laminate having good durability (blister resistance) can be obtained.
  • polyhydric alcohols examples include tri- or higher alcohols such as trimethylolpropane, glycerin and pentaerythritol.
  • the number of hydroxyl groups in the polyhydric alcohol is preferably 3 to 8.
  • lactones include cyclic esters having 3 to 11 carbon atoms such as ⁇ -propiolactone, ⁇ -butyrolactone, ⁇ -valerolactone, and ⁇ -caprolactone
  • alkylene oxide examples include ethylene oxide and propylene oxide.
  • alkylene oxides having 2 to 10 carbon atoms such as butylene oxide.
  • aliphatic diisocyanate and alicyclic diisocyanate As a polyfunctional isocyanate compound, aliphatic diisocyanate and alicyclic diisocyanate, and these isocyanurate bodies or biuret bodies are mentioned, for example.
  • aliphatic diisocyanates include ethylene diisocyanate, tetramethylene diisocyanate, pentamethylene diisocyanate, hexamethylene diisocyanate, 2-methyl-1,5-pentane diisocyanate, 3-methyl-1,5-pentane diisocyanate, 2,2,4.
  • aliphatic diisocyanates having 4 to 30 carbon atoms such as -trimethyl-1,6-hexamethylene diisocyanate.
  • alicyclic diisocyanates examples include isophorone diisocyanate, cyclopentyl diisocyanate, cyclohexyl diisocyanate, hydrogenated xylylene diisocyanate, hydrogenated tolylene diisocyanate, hydrogenated diphenylmethane diisocyanate, hydrogenated tetramethyl xylylene diisocyanate, etc. Aliphatic diisocyanates may be mentioned.
  • isocyanate-based crosslinking agent (B) a crosslinking agent having a skeleton ((-O-CH 2- ) 3 -C-CH 2 CH 3 ) derived from trimethylolpropane is preferable, and the formula (1) or the formula (2) is preferable.
  • the crosslinking agent represented by is more preferable.
  • R 1A , R 1B and R 1C each independently represent a group represented by formula (3) and / or a group comprising a group represented by formula (4)
  • R 2A , R 2B , R 2C , R 3A , R 3B , R 3C , R 3D , R 3E and R 3F are each independently an alkanediyl group having 4 to 10 carbon atoms such as 1,6-hexanediyl group is there.
  • R 11 is an alkanediyl group having 2 to 10, preferably 4 to 8 carbon atoms, which is more preferably linear, and m is an integer of 1 to 10, preferably 1 to 6 Is an integer of In the formula (4), R 21 is an alkanediyl group having 2 to 10, preferably 4 to 8 carbon atoms, and n is an integer of 1 to 10, preferably an integer of 1 to 6.
  • the group represented by the formula (3) and / or the group containing the group represented by the formula (4) is, for example, a group represented by the formula (3), a group represented by the formula (4), or It is a group which consists of a group represented by 3), and a group represented by Formula (4).
  • the molecular weight of the isocyanate-based crosslinking agent (B) is preferably 500 to 10,000, and more preferably 1,500 to 7,000.
  • a commercially available crosslinking agent can be used as the isocyanate crosslinking agent (B).
  • E402-80B manufactured by Asahi Kasei Corp.
  • E405-70B manufactured by Asahi Kasei Corp.
  • MFA-75B manufactured by Asahi Kasei Corp.
  • the isocyanate crosslinking agent (B) may be used alone or in combination of two or more.
  • the content of the isocyanate-based crosslinking agent (B) in the pressure-sensitive adhesive composition is usually 0.01 to 5 parts by mass, preferably 0. 1 to 100 parts by mass of the (meth) acrylic copolymer (A).
  • the content is 05 to 3 parts by mass, more preferably 0.1 to 2.5 parts by mass. In such an embodiment, it is possible to obtain a pressure-sensitive adhesive layer in which the crosslinked structure is sufficiently and appropriately formed, and therefore the cohesion is high and the durability is excellent.
  • the pressure-sensitive adhesive composition may contain, in addition to the isocyanate-based crosslinking agent (B), other crosslinking agents such as a metal chelate crosslinking agent and / or an epoxy-based crosslinking agent.
  • B isocyanate-based crosslinking agent
  • other crosslinking agents such as a metal chelate crosslinking agent and / or an epoxy-based crosslinking agent.
  • the content of the other crosslinking agent is preferably 5 parts by mass or less and 3 parts by mass or less with respect to 100 parts by mass of the (meth) acrylic copolymer (A). Is more preferred. With such an embodiment, it is possible to obtain a pressure-sensitive adhesive in which the crosslinked structure is sufficiently and appropriately formed, the cohesion is high, the balance of the adhesion properties is excellent, and the durability is excellent.
  • metal chelate crosslinking agent for example, alkoxide, acetylacetone, ethyl acetoacetate, etc. coordinate to a polyvalent metal such as aluminum, iron, copper, zinc, tin, titanium, nickel, antimony, magnesium, vanadium, chromium and zirconium.
  • a polyvalent metal such as aluminum, iron, copper, zinc, tin, titanium, nickel, antimony, magnesium, vanadium, chromium and zirconium.
  • a polyvalent metal such as aluminum, iron, copper, zinc, tin, titanium, nickel, antimony, magnesium, vanadium, chromium and zirconium.
  • a polyvalent metal such as aluminum, iron, copper, zinc, tin, titanium, nickel, antimony, magnesium, vanadium, chromium and zirconium.
  • Specific examples thereof include aluminum isopropylate, aluminum secondary butyrate, aluminum ethylacetoacetate / diisopropylate, aluminum triseth
  • an epoxy compound having 2 or more epoxy groups in one molecule is usually used.
  • the pressure-sensitive adhesive composition preferably further contains a plasticizer, as one embodiment.
  • a plasticizer for example, phthalic acid ester compound, adipic acid ester compound, trimellitic acid ester compound, sebacic acid ester compound, citric acid ester compound, phosphoric acid ester compound, polyester compound, palmitine Acid compounds and stearic acid compounds, specifically, dioctyl phthalate, diisononyl phthalate, diisodecyl phthalate, dibutyl phthalate, dioctyl adipate, diisononyl adipate, trioctyl trimellitate, tricresyl phosphate, Examples thereof include low molecular weight polyesters, isopropyl palmitate, octyl palmitate, methyl stearate, butyl stearate and octyl stearate. Among these, palmitic acid compounds and / or stearic acid compounds are preferable
  • the plasticizer may be used alone or in combination of two or more.
  • the content of the plasticizer in the pressure-sensitive adhesive composition is usually 0.01 to 3 parts by mass, preferably 0.05 to 1 parts by mass with respect to 100 parts by mass of the (meth) acrylic copolymer (A). It is. It is excellent in the affixing property to a to-be-adhered body (PC board) as it is such an aspect.
  • the pressure-sensitive adhesive composition contains, in addition to the components described above, a silane coupling agent, an antistatic agent, an ultraviolet light absorber, an antioxidant, a tackifier resin, and an adhesion regulator (for example, It may contain at least one selected from an organopolysiloxane compound), an antifoaming agent, a filler, a stabilizer, a softener, and a wettability regulator.
  • a silane coupling agent for example, an antistatic agent, an ultraviolet light absorber, an antioxidant, a tackifier resin, and an adhesion regulator (for example, It may contain at least one selected from an organopolysiloxane compound), an antifoaming agent, a filler, a stabilizer, a softener, and a wettability regulator.
  • the pressure-sensitive adhesive composition may contain an organic solvent in order to improve its handleability.
  • an organic solvent the polymerization solvent described by description of the manufacturing method of a (meth) acrylic-type copolymer (A) is mentioned, for example.
  • a pressure-sensitive adhesive composition can be prepared by mixing a solution containing a (meth) acrylic copolymer (A) and a polymerization solvent, and an isocyanate crosslinking agent (B).
  • the content of the organic solvent is usually 0 to 90% by mass, preferably 10 to 80% by mass.
  • the pressure-sensitive adhesive layer can be obtained by crosslinking the (meth) acrylic copolymer (A) with an isocyanate-based crosslinking agent (B) by crosslinking the pressure-sensitive adhesive composition.
  • the conditions for forming the pressure-sensitive adhesive layer are, for example, as follows.
  • the pressure-sensitive adhesive composition is coated on a first separator and dried at usually 60 to 120 ° C., preferably 70 to 110 ° C., usually 1 to 5 minutes, preferably 2 to 4 minutes to form a coating .
  • a second separator is attached to the coating film.
  • the obtained laminate is usually treated for 1 day or more, preferably 3 to 10 days, usually 5 to 60 ° C., preferably 15 to 40 ° C., usually 30 to 70% RH, preferably 40 to 70%. Curing (aging) under the environment of RH. When crosslinking is performed under the above-mentioned aging conditions, a crosslinked body can be efficiently formed.
  • the separator is preferably peel-treated on one or both sides of a long base material
  • the base material is, for example, polyester (eg, polyethylene terephthalate, polyethylene naphthalate), polycarbonate, polymethyl methacrylate, polyethylene, Plastics such as polypropylene, polyvinyl chloride, polyurethane, polyamide, ethylene-vinyl acetate copolymer, etc .; nonwoven fabric; paper.
  • the thickness of the pressure-sensitive adhesive layer is usually 3 to 1000 ⁇ m, preferably 5 to 500 ⁇ m.
  • the gel fraction of the pressure-sensitive adhesive layer is preferably 40 to 95% by mass, more preferably 50 to 90% by mass, and still more preferably 60 to 85% by mass. Such an embodiment is preferable from the viewpoint of improving cohesion and adhesion.
  • the gel fraction can be measured as follows. About 0.1 g of the adhesive from the adhesive layer is collected in a sample bottle, and 30 mL of ethyl acetate is added and shaken for 4 hours, and then the contents of this sample bottle are filtered through a 200 mesh stainless steel mesh, remaining on the mesh The product is dried at 100 ° C. for 2 hours to determine the dry weight.
  • the pressure-sensitive adhesive layer is disposed to bond the first layer and the second layer, and for example, the transparent members to be described later are bonded (that is, the first and second layers are transparent members), Alternatively, the transparent member and the transparent conductive film, which will be described later, are disposed to be bonded (that is, the first layer is a transparent conductive film, and the second layer is a transparent member).
  • the laminate of the present invention can be obtained by laminating the first layer and the second layer through the pressure-sensitive adhesive layer obtained from the pressure-sensitive adhesive composition. For example, after affixing the surface of the pressure-sensitive adhesive layer to the surface of the first layer (or second layer), the other surface (back surface) of the pressure-sensitive adhesive layer is used as the second layer (or first layer) The first layer and the second layer can be attached to each other by the pressure-sensitive adhesive layer.
  • the pressure-sensitive adhesive layer is formed by using a pressure-sensitive adhesive sheet having a substrate as a first layer and a pressure-sensitive adhesive layer obtained from the pressure-sensitive adhesive composition formed on one surface of the substrate.
  • the laminate of the present invention may be obtained by bonding to a polycarbonate plate as a layer.
  • the touch panel is mounted on, for example, a smartphone, a tablet computer, and an in-vehicle device such as a car navigation device.
  • the touch panel includes a touch panel unit.
  • touch panel unit examples include a resistive film type touch panel unit and a capacitive type touch panel unit, and these are laminates of various materials, and the laminate of the present invention is used as a part or all of the units. be able to.
  • the touch panel unit Since the touch panel unit is disposed on the outermost surface of the screen, the adhesive to be used is required to have high transparency, and further, properties such as high heat resistance and moist heat resistance are required.
  • the touch panel unit has, for example, a surface support, an adhesive layer, and a transparent conductive film made of metal or metal oxide in this order in the stacking direction, or a surface support, an adhesive layer, an electrode support And a transparent conductive film made of metal or metal oxide in the laminating direction in this order.
  • metals and metal oxides include indium tin oxide (ITO), antimony tin oxide (ATO), and tin oxide.
  • the resistive film type touch panel unit 10-1 is formed by bonding the upper laminate 11-1 and the lower laminate 13-1 so that the gap 34 is formed by the bonding agent 30.
  • a spacer 32 is formed in the gap 34 to effectively secure the gap width.
  • transparent conductive films 27-1 and 27-2 made of metal or metal oxide are disposed facing the gap 34, respectively.
  • the transparent conductive films 27-1 and 27-2 are formed on the surfaces of the upper electrode support 25-1 and the lower electrode support 25-2 which are usually made of a transparent member.
  • the surface support 21-1 is disposed on the outermost surface of the upper laminate 11-1, and the surface support 21-1 is usually a transparent member.
  • a deep surface support 21-2 is disposed at the deepest portion of the lower laminate 13-1 so as to face the surface of a flat panel display (FPD), and the surface support 21-2 is usually a transparent member. It is.
  • An adhesive layer 23-1 is disposed to bond the surface support 21-1 and the upper electrode support 25-1.
  • An adhesive layer 23-2 is disposed to bond the deep surface support 21-2 and the lower electrode support 25-2.
  • the transparent member examples include films made of transparent plastic such as polyester (eg, polyethylene terephthalate, polyethylene naphthalate), polycarbonate, polymethyl methacrylate and the like; and glass plates. The same applies to the following capacitance method.
  • transparent plastic such as polyester (eg, polyethylene terephthalate, polyethylene naphthalate), polycarbonate, polymethyl methacrylate and the like. The same applies to the following capacitance method.
  • the laminate of the present invention can be used as a laminate of the surface support 21-1, the pressure-sensitive adhesive layer 23-1, and the upper electrode support 25-1.
  • the pressure-sensitive adhesive layer 23-1 is formed of the pressure-sensitive adhesive composition described above, and at least one of the surface support 21-1 and the upper electrode support 25-1 has the weight ratio of 1.0010 to It is a polycarbonate plate of 1.0050.
  • the laminate of the present invention can be used as a laminate of the deep surface support 21-2, the pressure-sensitive adhesive layer 23-2, and the lower electrode support 25-2.
  • the pressure-sensitive adhesive layer 23-2 is formed of the pressure-sensitive adhesive composition described above, and at least one of the surface support 21-2 and the lower electrode support 25-2 in the deep portion has the weight ratio of 1. It is a polycarbonate plate of 0010 to 1.0050.
  • a circuit is formed on the transparent conductive films 27-1 and 27-2, and by applying pressure from above the surface support 21-1 with a finger or the like, the gap 34 in the portion to which the pressure is applied disappears and the transparent The conductive films 27-1 and 27-2 come into contact with each other to be energized, whereby a pressurized portion can be detected.
  • ⁇ Capacitive touch panel> In the capacitive touch panel unit 10-2, as shown in FIG. 2, generally, an upper laminate 15-1 and a lower laminate 15-2 sandwiching a central support 60 made of a transparent member. Often have a arranged structure.
  • the transparent conductive film 57-1 is disposed in contact with the central support 60, and the surface support 51-1 made of a transparent member is disposed on the outermost surface.
  • the pressure-sensitive adhesive layer 53-1 is disposed to bond the transparent conductive film 57-1 and the surface support 51-1, and the pressure-sensitive adhesive layer 53-1 is in direct contact with the transparent conductive film 57-1. There is.
  • the laminate of the present invention can be used as the upper laminate 15-1.
  • the pressure-sensitive adhesive layer 53-1 is formed of the pressure-sensitive adhesive composition described above
  • the transparent conductive film 57-1 is the first layer
  • the weight ratio of the surface support 51-1 is It is a polycarbonate plate (second layer) of 1.0010 to 1.0050.
  • the transparent conductive film 57-2 is disposed in contact with the central support 60, and the surface support 51-2 made of a transparent member is disposed at the deepest portion.
  • the adhesive layer 53-2 is disposed so as to adhere the transparent conductive film 57-2 and the surface support 51-2 at the deepest portion, and the adhesive layer 53-2 directly contacts the transparent conductive film 57-2. It is in contact.
  • the laminate of the present invention can be used as the upper laminate 15-2.
  • the pressure-sensitive adhesive layer 53-2 is formed of the pressure-sensitive adhesive composition described above
  • the transparent conductive film 57-2 is the first layer
  • the surface support 51-2 of the deepest portion is the above-mentioned. It is a polycarbonate plate (second layer) having a weight ratio of 1.0010 to 1.0050.
  • the surface support 51-2 at the deepest portion is disposed to face the flat panel display.
  • Transparent conductive films 57-1 and 57-2 form a circuit.
  • Mw and Mw / Mn were determined by gel permeation chromatography (GPC) under the following conditions.
  • Measurement device HLC-8120GPC (made by Tosoh Corporation)
  • GPC column configuration 5 columns below (all made by Tosoh) (1) TSK-GEL HXL-H (guard column) (2) TSK-GEL G7000HXL (3) TSK-GEL GMHXL (4) TSK-GEL GMHXL (5) TSK-GEL G2500HXL Sample concentration: diluted with tetrahydrofuran so as to be 1.0 mg / cm 3
  • Mobile phase solvent tetrahydrofuran Flow rate: 1.0 cm 3 / min ⁇ Column temperature: 40 ° C
  • Tg Glass transition temperature
  • the reaction solution was diluted with ethyl acetate to prepare a polymer solution.
  • the Mw of the obtained (meth) acrylic copolymer (A-1) was 360,000, the Mw / Mn was 11, and the Tg was ⁇ 37 ° C.
  • BA n-butyl acrylate
  • MEA 2-methoxyethyl acrylate
  • HEA 2-hydroxyethyl acrylate
  • AA acrylic acid
  • AA-6 methyl methacrylate macromonomer (manufactured by Toagosei Co., Ltd.)
  • Example 1 E405-70B which is an isocyanate crosslinking agent, based on 100 parts of the solid content of the (meth) acrylic copolymer (A-1): hexamethylene diisocyanate / butylene oxide and ⁇ -caprolactone modified trimethylolpropane adduct ( Asahi Kasei Co., Ltd. (solid content: 70% by mass) was added to the polymer solution in an amount such that the solid content was 0.9 parts to obtain a pressure-sensitive adhesive composition.
  • A-1 hexamethylene diisocyanate / butylene oxide and ⁇ -caprolactone modified trimethylolpropane adduct
  • the obtained pressure-sensitive adhesive composition is coated on a release-treated PET film (separator) so that the thickness after drying is 50 ⁇ m, dried at 90 ° C. for 3 minutes, and the solvent is removed to obtain a thickness. A 50 ⁇ m coating was formed. On the surface of the coated film opposite to the side in contact with the PET film, a separator of a PET film substrate having a peeling force smaller than that of the separator was attached. Subsequently, it was aged for 7 days under an environment of 23 ° C. and 65% RH to obtain a pressure-sensitive adhesive sheet having a 50 ⁇ m-thick pressure-sensitive adhesive layer.
  • ⁇ Blister resistance test> After peeling off the separator with a smaller peel strength from the above adhesive sheet and sticking the exposed adhesive layer on a 100 ⁇ m thick PET film (first layer), it is cut into a size of 60 mm ⁇ 50 mm, One of the exfoliated separators is peeled off, and the exposed adhesive layer is formed of polycarbonate PC1600 (thickness 2.0 mm, weight ratio below: 1.0021, density: 1.093 to 1.098 g / cm 3 : Tachylon Eye) (2nd layer) and then held for 20 minutes in an autoclave adjusted to 50 ° C. and 5 atm to prepare a test plate. The blister resistance was evaluated based on the criteria described in Table 2 after the test plate was left under conditions of 85 ° C./85% RH for 72 hours. The weight ratio and density of the polycarbonate plate were measured as follows.
  • ⁇ Whitening resistance test> After peeling off the separator with a smaller peel strength from the above adhesive sheet and sticking the exposed adhesive layer on a 100 ⁇ m thick PET film (first layer), it is cut into a size of 60 mm ⁇ 50 mm, One of the exfoliated separators is peeled off, the exposed adhesive layer is attached to a polycarbonate plate (PC1600: made by Tachyloncy Eye) (second layer), and then it is placed in an autoclave adjusted to 50 ° C. and 5 atm. It hold
  • Examples 2 to 9, Comparative Examples 1 to 4, Reference Examples 1 and 2 A pressure-sensitive adhesive composition was prepared in the same manner as in Example 1 except that the composition of the pressure-sensitive adhesive composition was changed as described in Table 3, to obtain a pressure-sensitive adhesive sheet.
  • the amount of the crosslinking agent is an amount based on 100 parts of the (meth) acrylic copolymer.
  • NF 2000 VU thickness 1.5 mm, weight ratio: 1.0006, density: 1.124 to 1.132 g / cm 3 : manufactured by Mitsubishi Gas Chemical Co., Ltd.
  • NF 2000 VU thickness 1.5 mm, weight ratio: 1.0006, density: 1.124 to 1.132 g / cm 3 : manufactured by Mitsubishi Gas Chemical Co., Ltd.
  • E405-70B Hexamethylene diisocyanate / butylene oxide and ⁇ -caprolactone modified trimethylolpropane adduct (manufactured by Asahi Kasei Corp., solid content 70% by mass)
  • MFA-75B Isocyanurate of hexamethylene diisocyanate / ⁇ -caprolactone modified trimethylolpropane adduct (Asahi Kasei, 70% solid content by solid content)
  • E402-80B Hexamethylene diisocyanate / ⁇ -caprolactone modified trimethylolpropane adduct (Asahi Kasei, 90% by mass solid content)
  • D-90 Biuret of hexamethylene diisocyanate (Soken Chemical Co., Ltd., solid content 90% by mass)
  • L-45 Reactant of tolylene diisocyanate and trimethylolpropane (manufactured by Soken Chemical Co., Ltd.,
  • the blister resistance and the whitening resistance were good even when the PC board having the weight ratio of 1.0021 was used.
  • a laminate excellent in durability can be provided.

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Abstract

Le problème décrit par la présente invention est de fournir un corps stratifié qui comprend, par l'intermédiaire d'une couche adhésive, une plaque de polycarbonate ayant une capacité d'absorption d'eau élevée et une autre couche, et qui présente une excellente résistance au cloquage et une excellente résistance au blanchiment dans des conditions de durabilité élevée. La solution selon l'invention consiste en un corps stratifié obtenu par stratification d'une première couche et d'une seconde couche par l'intermédiaire d'une couche adhésive, le corps stratifié étant caractérisé en ce que : la seconde couche est une plaque de polycarbonate qui a un rapport du poids (poids après avoir été laissée reposer/poids avant d'avoir été laissée reposer) avant et après avoir été laissée reposer pendant 72 heures dans un environnement de 85 °C/85 % d'humidité relative (HR) de 1,0010 à 1,0050 ; et la couche adhésive est formée à partir d'une composition adhésive comprenant (A) un copolymère (méth)acrylique qui est un copolymère de composants monomères comprenant un macromonomère polymérisable et un monomère ayant un groupe fonctionnel réticulable, et (B) un agent de réticulation à base d'isocyanate ayant un groupe alkylèneoxy possédant au moins deux atomes de carbone.
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JP2021031553A (ja) * 2019-08-21 2021-03-01 王子ホールディングス株式会社 粘着シート、剥離シート付き粘着シート及び積層体
JP2021031554A (ja) * 2019-08-21 2021-03-01 王子ホールディングス株式会社 積層体の製造方法
WO2021044928A1 (fr) * 2019-09-05 2021-03-11 Ａｇｃ株式会社 Stratifié équipé d'un conducteur, et unité d'antenne
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JP2017095654A (ja) * 2015-11-27 2017-06-01 三星エスディアイ株式会社Ｓａｍｓｕｎｇ ＳＤＩ Ｃｏ． 光学フィルム用粘着剤、粘着剤層、光学部材および画像表示装置

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WO2021033704A1 (fr) * 2019-08-21 2021-02-25 王子ホールディングス株式会社 Feuille adhésive, feuille adhésive pourvue d'une feuille de protection amovible et procédé de production de stratifié
JP2021031553A (ja) * 2019-08-21 2021-03-01 王子ホールディングス株式会社 粘着シート、剥離シート付き粘着シート及び積層体
JP2021031554A (ja) * 2019-08-21 2021-03-01 王子ホールディングス株式会社 積層体の製造方法
JP7338319B2 (ja) 2019-08-21 2023-09-05 王子ホールディングス株式会社 積層体の製造方法
JP7338318B2 (ja) 2019-08-21 2023-09-05 王子ホールディングス株式会社 粘着シート、剥離シート付き粘着シート及び積層体
WO2021044928A1 (fr) * 2019-09-05 2021-03-11 Ａｇｃ株式会社 Stratifié équipé d'un conducteur, et unité d'antenne
JPWO2021085136A1 (fr) * 2019-10-28 2021-05-06
WO2021085136A1 (fr) * 2019-10-28 2021-05-06 綜研化学株式会社 Composition d'agent adhésif, feuille adhésive et élément optique
CN114599756A (zh) * 2019-10-28 2022-06-07 综研化学株式会社 粘合剂组合物、粘合片以及光学构件

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KR20200040239A (ko) 2020-04-17
JP7029456B2 (ja) 2022-03-03
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