WO2015145634A1 - 両面粘着シート - Google Patents

両面粘着シート Download PDF

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Publication number
WO2015145634A1
WO2015145634A1 PCT/JP2014/058650 JP2014058650W WO2015145634A1 WO 2015145634 A1 WO2015145634 A1 WO 2015145634A1 JP 2014058650 W JP2014058650 W JP 2014058650W WO 2015145634 A1 WO2015145634 A1 WO 2015145634A1
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WO
WIPO (PCT)
Prior art keywords
sensitive adhesive
pressure
meth
adhesive layer
double
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PCT/JP2014/058650
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English (en)
French (fr)
Japanese (ja)
Inventor
旭平 渡邉
隆行 荒井
所司　悟
Original Assignee
リンテック株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by リンテック株式会社 filed Critical リンテック株式会社
Priority to CN201480077481.4A priority Critical patent/CN106133083B/zh
Priority to PCT/JP2014/058650 priority patent/WO2015145634A1/ja
Priority to KR1020167027973A priority patent/KR102215672B1/ko
Priority to JP2016509726A priority patent/JP6290377B2/ja
Priority to TW104109690A priority patent/TWI649395B/zh
Publication of WO2015145634A1 publication Critical patent/WO2015145634A1/ja

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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
    • 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
    • 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
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/308—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising acrylic (co)polymers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • 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
    • C09J133/10—Homopolymers or copolymers of methacrylic acid esters
    • C09J133/12—Homopolymers or copolymers of methyl methacrylate
    • 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
    • C09J7/10—Adhesives in the form of films or foils without carriers
    • 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
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
    • B32B2307/202—Conductive
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/412—Transparent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2457/00—Electrical equipment
    • B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays
    • B32B2457/208—Touch screens

Definitions

  • the present invention relates to a double-sided pressure-sensitive adhesive sheet that can be used for a touch panel or the like.
  • capacitive touch panels there are various configurations of capacitive touch panels.
  • a display module such as a liquid crystal module, a first film sensor laminated thereon with an adhesive layer thereon, The structure provided with the 2nd film sensor laminated
  • the film sensor is usually composed of a base film and a transparent conductive film made of patterned tin-doped indium oxide (ITO).
  • ITO patterned tin-doped indium oxide
  • Patent Document 1 an undercoat layer is formed between a film substrate and a transparent conductor layer, and the refractive index of the transparent conductor layer and the refractive index of the undercoat layer are By utilizing the difference, an attempt is made to suppress the difference in reflectance between the pattern portion and the non-pattern portion of the transparent conductor layer, thereby suppressing the appearance of bone.
  • the easy-adhesion layer which prescribed
  • Patent Document 1 it is difficult to control the film thickness of the undercoat layer as described above, and it is difficult to obtain a sufficient bone appearance suppressing effect. Moreover, there also existed a problem that cost became high by providing an undercoat layer. On the other hand, in the invention described in Patent Document 2, it is difficult to control the refractive index and the film thickness of the easy-adhesion layer, and it is difficult to obtain a sufficient bone appearance suppressing effect.
  • This invention is made
  • the present invention provides an adhesive layer disposed between two patterned transparent conductive films, or between a patterned transparent conductive film and a cover material or a display module.
  • the adhesive layer is composed of an adhesive composed of an adhesive composition containing an adhesive component and light diffusing fine particles, and the haze value of the adhesive layer is 2 to 40%.
  • a double-sided PSA sheet is provided (Invention 1).
  • the pressure-sensitive adhesive layer of the double-sided pressure-sensitive adhesive sheet according to the invention (Invention 1) is disposed between two patterned transparent conductive films, or between a patterned transparent conductive film and a cover material or a display module. Moreover, when the haze value of the pressure-sensitive adhesive layer is in the above range, it is possible to make it difficult to see the circuit pattern of the transparent conductive film while maintaining high light transmittance.
  • the average particle diameter of the light diffusing fine particles by centrifugal sedimentation light transmission method is preferably 0.1 to 20 ⁇ m (Invention 2).
  • the adhesive component preferably contains a (meth) acrylic acid ester polymer (Invention 3).
  • the (meth) acrylic acid ester polymer is preferably crosslinked by a crosslinking agent (Invention 4).
  • the content of the light diffusing fine particles is preferably 0.01 to 15 parts by mass with respect to 100 parts by mass of the (meth) acrylic acid ester polymer (Invention 5). ).
  • the present invention also provides an adhesive layer of the double-sided pressure-sensitive adhesive sheet (Inventions 1 to 5) between two patterned transparent conductive films or between a patterned transparent conductive film and a cover material or a display module.
  • an adhesive layer of the double-sided pressure-sensitive adhesive sheet (Inventions 1 to 5) between two patterned transparent conductive films or between a patterned transparent conductive film and a cover material or a display module.
  • a laminated body characterized by comprising:
  • the pressure-sensitive adhesive layer may be in direct contact with the transparent conductive film, the cover material, or the display module, or may not be in contact.
  • the pressure-sensitive adhesive layer of the double-sided pressure-sensitive adhesive sheet according to the present invention it is possible to make it difficult to see the circuit pattern of the transparent conductive film while maintaining high light transmittance in a capacitive touch panel or the like.
  • the double-sided pressure-sensitive adhesive sheet according to this embodiment includes a pressure-sensitive adhesive layer disposed between two patterned transparent conductive films or between a patterned transparent conductive film and a cover material or a display module. is there.
  • the double-sided pressure-sensitive adhesive sheet 1 includes two release sheets 3a and 3b and the two release sheets so as to be in contact with the release surfaces of the two release sheets 3a and 3b. It is comprised from the adhesive layer 2 clamped by 3a, 3b.
  • the release sheets 3a and 3b are not essential components, and are peeled off and removed when the double-sided pressure-sensitive adhesive sheet 1 is used.
  • the release surface of the release sheet in this specification refers to a surface having peelability in the release sheet, and includes both a surface that has been subjected to a release treatment and a surface that exhibits peelability without being subjected to a release treatment. .
  • the pressure-sensitive adhesive layer 2 in the present embodiment is constituted by a pressure-sensitive adhesive formed from a pressure-sensitive adhesive composition containing a pressure-sensitive adhesive component and light diffusing fine particles (hereinafter sometimes referred to as “pressure-sensitive adhesive composition P”).
  • the haze value is 2 to 40%.
  • a transparent conductive film is maintained while maintaining high light transmittance in a capacitive touch panel or the like. This makes it difficult to see the circuit pattern and exhibits an excellent bone-inhibiting effect.
  • the haze value of the pressure-sensitive adhesive layer 2 is preferably 3 to 30%, particularly preferably 6 to 20%. Note that the haze value in the present specification is a value measured according to JIS K7136: 2000.
  • Adhesive component is not particularly limited as long as it exhibits a desired adhesive force on a capacitive touch panel or the like, has optical transparency, and does not inhibit the effect of the light diffusing fine particles.
  • the adhesive component include an acrylic adhesive component, a rubber adhesive component, a silicone adhesive component, a polyurethane adhesive component, and a polyester adhesive component. Among these, an acrylic adhesive component is preferable from the above viewpoint.
  • acrylic pressure-sensitive adhesive component those containing the (meth) acrylic acid ester polymer (A) are preferable, and in particular, the (meth) acrylic acid ester polymer (A) cross-linked by the cross-linking agent (B) is preferable.
  • (meth) acrylic acid means both acrylic acid and methacrylic acid. The same applies to other similar terms.
  • the term “polymer” includes the concept of “copolymer”.
  • the (meth) acrylic acid ester polymer (A) preferably contains a (meth) acrylic acid alkyl ester having an alkyl group having 1 to 20 carbon atoms as a monomer constituting the polymer. Thereby, the obtained adhesive can express preferable adhesiveness.
  • the (meth) acrylic acid ester polymer (A) is a monomer having a functional group that reacts with a (meth) acrylic acid alkyl ester having an alkyl group having 1 to 20 carbon atoms and a crosslinking agent (B) (reactive property). Particularly preferred is a copolymer of a functional group-containing monomer) and other monomers used as desired. In addition, the hard monomer mentioned later is excluded from the (meth) acrylic acid alkyl ester.
  • alkyl ester having 1 to 20 carbon atoms in the alkyl group examples include methyl acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, n-butyl (meth) acrylate, ( N-pentyl (meth) acrylate, n-hexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, isooctyl (meth) acrylate, n-decyl (meth) acrylate, n-dodecyl (meth) acrylate , Myristyl (meth) acrylate, palmityl (meth) acrylate, stearyl (meth) acrylate, and the like.
  • (meth) acrylic acid esters having 1 to 8 carbon atoms in the alkyl group are preferred from the viewpoint of further improving the tackiness, and methyl acrylate, n-butyl (meth) acrylate and (meth) acrylic acid 2- Ethylhexyl is particularly preferred.
  • these may be used independently and may be used in combination of 2 or more type.
  • the (meth) acrylic acid ester polymer (A) contains 30 to 90% by mass of a (meth) acrylic acid alkyl ester having an alkyl group having 1 to 20 carbon atoms as a monomer unit constituting the polymer.
  • the content is preferably 40 to 75% by mass, more preferably 50 to 65% by mass.
  • the reactive functional group-containing monomer a monomer having a hydroxyl group in the molecule (hydroxyl group-containing monomer), a monomer having a carboxyl group in the molecule (carboxyl group-containing monomer), a monomer having an amino group in the molecule (amino group-containing) Monomer) and the like.
  • hydroxyl group-containing monomer examples include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, (meth And (meth) acrylic acid hydroxyalkyl esters such as 3-hydroxybutyl acrylate and 4-hydroxybutyl (meth) acrylate.
  • 2-hydroxyethyl (meth) acrylate is preferable from the viewpoint of the reactivity of the hydroxyl group in the resulting (meth) acrylic acid ester polymer (A) with the crosslinking agent (B) and the copolymerizability with other monomers. Is preferred. These may be used alone or in combination of two or more.
  • carboxyl group-containing monomer examples include ethylenically unsaturated carboxylic acids such as acrylic acid, methacrylic acid, crotonic acid, maleic acid, itaconic acid, and citraconic acid.
  • carboxylic acids such as acrylic acid, methacrylic acid, crotonic acid, maleic acid, itaconic acid, and citraconic acid.
  • acrylic acid is preferable from the viewpoint of the reactivity of the resulting (meth) acrylic acid ester polymer (A) with the crosslinking agent (B) of the carboxyl group and the copolymerizability with other monomers. These may be used alone or in combination of two or more.
  • amino group-containing monomer examples include aminoethyl (meth) acrylate, n-butylaminoethyl (meth) acrylate, and the like. These may be used alone or in combination of two or more.
  • the content is from the viewpoint of step following ability under durable conditions. 15 to 30% by mass, preferably 17 to 28% by mass, and in addition to the above viewpoint, 20 to 25% by mass from the viewpoint of optimizing the resistance to moist heat whitening. It is preferable that
  • the content is the viewpoint of step following ability under durability conditions. From 5 to 25% by mass, preferably from 7 to 20% by mass, and in addition to the above viewpoint, from the viewpoint of optimizing the moisture and heat whitening resistance, 10 to 15% by mass is preferable. % Is preferred.
  • the reactive functional group is usually a hydrophilic group, and when such a hydrophilic group is present in the pressure-sensitive adhesive layer in a predetermined amount, even when the pressure-sensitive adhesive layer is placed under high-temperature and high-humidity conditions, The compatibility with the water
  • the (meth) acrylic acid ester polymer (A) preferably contains an acrylic acid ester hard monomer as a monomer unit constituting the polymer.
  • the hard monomer means a monomer having a glass transition temperature (Tg) of 70 ° C. or more, preferably 75 to 200 ° C., particularly preferably 80 to 180 ° C. as a homopolymer obtained by polymerizing only the hard monomer.
  • Tg glass transition temperature
  • the obtained pressure-sensitive adhesive has excellent durability and blister resistance. Therefore, even when the adherend is a plastic plate and outgas is generated from the plastic plate, occurrence of blisters such as bubbles, floats, and peeling is suppressed.
  • Examples of the hard monomer include methyl methacrylate (Tg 105 ° C.), isobornyl acrylate (Tg 94 ° C.), isobornyl methacrylate (Tg 180 ° C.), acryloylmorpholine (Tg 145 ° C.), adamantyl acrylate (Tg 115 ° C.), and adamantyl methacrylate. (Tg 141 ° C.), dimethylacrylamide (Tg 89 ° C.), acrylamide (Tg 165 ° C.) and the like. These may be used alone or in combination of two or more.
  • methyl methacrylate, isobornyl acrylate and acryloyl morpholine are more preferable from the viewpoint of exerting the performance of the hard monomer while preventing adverse effects on other properties such as adhesion and transparency, and methacrylic acid. Methyl is particularly preferred.
  • the (meth) acrylic acid ester polymer (A) preferably contains 10 to 45% by mass, and particularly preferably 15 to 30% by mass of the hard monomer as a monomer unit constituting the polymer.
  • the hard monomer in an amount of 10% by mass or more, an effect of improving durability or blister resistance by the monomer unit can be expected.
  • the hard monomer content is set to 45% by mass or less, the relative shortage of other monomer units in the (meth) acrylic acid ester polymer (A) is prevented, and the pressure-sensitive adhesive obtained Adhesiveness, level difference followability and wet heat whitening resistance can be improved.
  • the (meth) acrylic acid ester polymer (A) preferably contains the hydroxyl group-containing monomer and the hard monomer in the above-described ranges as monomer units constituting the polymer. Thereby, the obtained adhesive becomes more excellent in blister resistance.
  • the (meth) acrylic acid ester polymer (A) may contain other monomers as a monomer unit constituting the polymer, if desired.
  • the other monomer is preferably a monomer that does not contain a reactive functional group in order not to interfere with the action of the hydroxyl group-containing monomer.
  • Such other monomers include, for example, (meth) acrylic acid alkoxyalkyl esters such as methoxyethyl (meth) acrylate and ethoxyethyl (meth) acrylate, and aliphatic rings such as cyclohexyl (meth) acrylate (meta ) Acrylic acid ester, (meth) acrylic acid N, N-dimethylaminoethyl, (meth) acrylic acid N, N-dimethylaminopropyl, etc. (meth) acrylic acid ester having acetic acid tertiary amino group, acetic acid Examples include vinyl and styrene. These may be used alone or in combination of two or more.
  • the polymerization mode of the (meth) acrylic acid ester polymer (A) may be a random copolymer or a block copolymer.
  • the (meth) acrylic acid ester polymer (A) preferably has a weight average molecular weight of 100,000 to 1,500,000, particularly preferably 200,000 to 1,300,000, and more preferably 300,000 to 800,000. preferable.
  • the weight average molecular weight in this specification is the value of polystyrene conversion measured by the gel permeation chromatography (GPC) method.
  • the (meth) acrylic acid ester polymer (A) may be used alone or in combination of two or more.
  • the adhesive composition P contains the (meth) acrylic acid ester polymer (A) as an adhesive component, and the (meth) acrylic acid ester polymer (A) has the above-mentioned predetermined composition and molecular weight, it is obtained.
  • the pressure-sensitive adhesive layer 2 is excellent in step following ability. Therefore, even if the pressure-sensitive adhesive layer 2 is affixed to a cover material having a step due to a printed layer or the like, it is difficult to form a gap or a bubble between the step and the pressure-sensitive adhesive layer. Moreover, even when the laminate is placed at a high temperature such as 80 ° C., bubbles and the like are prevented from being generated in the vicinity of the step.
  • (1-2) Crosslinking agent (B) When the adhesive component of the adhesive composition P contains a (meth) acrylic acid ester polymer (A) containing a reactive functional group-containing monomer as a monomer unit constituting the polymer, and a crosslinking agent (B), When the adhesive composition P is heated or the like, the crosslinking agent (B) reacts with the reactive functional group of the reactive functional group-containing monomer constituting the (meth) acrylic acid ester polymer (A). Thereby, the structure by which (meth) acrylic acid ester polymer (A) was bridge
  • the crosslinking agent (B) may be any one that reacts with the reactive functional group of the (meth) acrylic acid ester polymer (A).
  • an isocyanate crosslinking agent for example, an isocyanate crosslinking agent, an epoxy crosslinking agent, and an amine crosslinking agent.
  • Melamine crosslinking agent aziridine crosslinking agent, hydrazine crosslinking agent, aldehyde crosslinking agent, oxazoline crosslinking agent, metal alkoxide crosslinking agent, metal chelate crosslinking agent, metal salt crosslinking agent, ammonium salt crosslinking agent, etc. Is mentioned.
  • the reactive functional group of the (meth) acrylic acid ester polymer (A) is a hydroxyl group
  • an isocyanate-based crosslinking agent that is excellent in reactivity with the hydroxyl group
  • (meth) acrylic acid when the reactive functional group which the ester polymer (A) has is a carboxyl group, it is preferable to use an epoxy-based crosslinking agent having excellent reactivity with the carboxyl group.
  • a crosslinking agent (B) can be used individually by 1 type or in combination of 2 or more types.
  • the isocyanate-based crosslinking agent contains at least a polyisocyanate compound.
  • the polyisocyanate compound include aromatic polyisocyanates such as tolylene diisocyanate, diphenylmethane diisocyanate and xylylene diisocyanate, aliphatic polyisocyanates such as hexamethylene diisocyanate, alicyclic polyisocyanates such as isophorone diisocyanate and hydrogenated diphenylmethane diisocyanate, etc.
  • biuret bodies, isocyanurate bodies, and adduct bodies that are a reaction product with low molecular active hydrogen-containing compounds such as ethylene glycol, propylene glycol, neopentyl glycol, trimethylolpropane, and castor oil.
  • low molecular active hydrogen-containing compounds such as ethylene glycol, propylene glycol, neopentyl glycol, trimethylolpropane, and castor oil.
  • trimethylolpropane-modified aromatic polyisocyanate particularly trimethylolpropane-modified tolylene diisocyanate and trimethylolpropane-modified xylylene diisocyanate are preferable from the viewpoint of reactivity with hydroxyl groups.
  • epoxy-based crosslinking agent examples include 1,3-bis (N, N′-diglycidylaminomethyl) cyclohexane, N, N, N ′, N′-tetraglycidyl-m-xylylenediamine, ethylene glycol diglycidyl.
  • examples include ether, 1,6-hexanediol diglycidyl ether, trimethylolpropane diglycidyl ether, diglycidyl aniline, diglycidyl amine and the like.
  • the content of the crosslinking agent (B) in the pressure-sensitive adhesive composition P is preferably 0.001 to 10 parts by mass, particularly 0, relative to 100 parts by mass of the (meth) acrylic acid ester polymer (A).
  • the amount is preferably 0.01 to 5 parts by mass, more preferably 0.02 to 1 part by mass.
  • the light diffusing fine particles may be any as long as the haze value of the pressure-sensitive adhesive layer 2 can be within the above range.
  • silica calcium carbonate, aluminum hydroxide, magnesium hydroxide, clay Inorganic fine particles such as talc and titanium dioxide; organic translucent fine particles such as acrylic resin, polystyrene resin, polyethylene resin, and epoxy resin; silicon-containing intermediate structure between inorganic and organic such as silicone resin Fine particles composed of a compound (for example, Tospearl series manufactured by Momentive Performance Materials Japan) are included.
  • acrylic resin fine particles and fine particles made of a silicon-containing compound having an intermediate structure between inorganic and organic are preferable because they are excellent in dispersibility with respect to the adhesive component and can provide uniform optical properties.
  • the above light diffusing fine particles may be used alone or in combination of two or more.
  • the shape of the light diffusing fine particles is preferably spherical fine particles with uniform light diffusion.
  • the average particle diameter of the light diffusing fine particles by the centrifugal sedimentation light transmission method is preferably 0.1 to 20 ⁇ m, and more preferably 1 to 10 ⁇ m.
  • the average particle diameter determined by the centrifugal sedimentation light transmission method is preferably 1 to 10 ⁇ m.
  • the haze value can be set to the above-described range without hindering the light transmittance of the pressure-sensitive adhesive layer 2.
  • the average particle diameter by the centrifugal sedimentation light transmission method was obtained by sufficiently stirring 1.2 g of fine particles and 98.8 g of isopropyl alcohol as a measurement sample, and using a centrifugal automatic particle size distribution measuring apparatus (manufactured by Horiba, Ltd., Measured using CAPA-700).
  • the content of the light diffusing fine particles is 100 parts by mass of the (meth) acrylate polymer (A).
  • the content is preferably 0.01 to 15 parts by mass, and more preferably 0.1 to 4 parts by mass.
  • the amount is particularly preferably 0.2 to 1.5 parts by mass.
  • the amount is most preferably 2 to 0.9 parts by mass, and most preferably 0.3 to 3 parts by mass in the case of organic translucent fine particles.
  • the haze value of the pressure-sensitive adhesive layer 2 can be set to the above-described range, and an excellent bone appearance suppressing effect can be obtained.
  • the adhesive component is other than the acrylic adhesive component, the content of the light diffusing fine particles is preferably in the above range with respect to 100 parts by mass of the adhesive component.
  • the pressure-sensitive adhesive composition P (the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 2) may be various additives such as a silane coupling agent, a refractive index adjusting agent, an antistatic agent, a tackifier, if desired. You may contain antioxidant, a ultraviolet absorber, a light stabilizer, a softener, a filler, etc.
  • the adhesive composition P preferably contains a silane coupling agent from the viewpoint of improving the adhesive strength of the obtained adhesive.
  • the silane coupling agent is preferably an organosilicon compound having at least one alkoxysilyl group in the molecule, having good compatibility with the adhesive component and having light transmittance.
  • silane coupling agents include polymerizable unsaturated group-containing silicon compounds such as vinyltrimethoxysilane, vinyltriethoxysilane, and methacryloxypropyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, 2- ( 3,4-epoxycyclohexyl) silicon compounds having an epoxy structure such as ethyltrimethoxysilane, mercapto group-containing silicon compounds such as 3-mercaptopropyltrimethoxysilane, 3-mercaptopropyltriethoxysilane, and 3-mercaptopropyldimethoxymethylsilane Amino group-containing compounds such as 3-aminopropyltrimethoxysilane, N- (2-aminoethyl) -3-aminopropyltrimethoxysilane, N- (2-aminoethyl) -3-aminopropylmethyldimethoxysilane, etc.
  • silicon compounds such as
  • the content of the silane coupling agent is 100 parts by mass of the (meth) acrylate polymer (A).
  • the content is preferably 0.01 to 10 parts by mass, particularly preferably 0.05 to 5 parts by mass, and further preferably 0.1 to 1 part by mass.
  • an adhesive component is other than an acrylic adhesive component, it is preferable that content of a silane coupling agent is said range with respect to 100 mass parts of adhesive components.
  • the adhesive composition P can be produced by mixing an adhesive component, light diffusing fine particles, and an additive as required.
  • the pressure-sensitive adhesive component contains the (meth) acrylic acid ester polymer (A)
  • the (meth) acrylic acid ester polymer (A) is prepared first, and a crosslinking agent (B) is blended if desired.
  • the (meth) acrylic acid ester polymer (A) can be produced by polymerizing a mixture of monomer units constituting the polymer by an ordinary radical polymerization method.
  • the polymerization of the (meth) acrylic acid ester polymer (A) can be performed by a solution polymerization method or the like using a polymerization initiator as desired.
  • the polymerization solvent include ethyl acetate, n-butyl acetate, isobutyl acetate, toluene, acetone, hexane, methyl ethyl ketone and the like, and two or more kinds may be used in combination.
  • Examples of the polymerization initiator include azo compounds and organic peroxides, and two or more kinds may be used in combination.
  • Examples of the azo compound include 2,2′-azobisisobutyronitrile, 2,2′-azobis (2-methylbutyronitrile), 1,1′-azobis (cyclohexane 1-carbonitrile), 2 2,2'-azobis (2,4-dimethylvaleronitrile), 2,2'-azobis (2,4-dimethyl-4-methoxyvaleronitrile), dimethyl 2,2'-azobis (2-methylpropionate) 4,4′-azobis (4-cyanovaleric acid), 2,2′-azobis (2-hydroxymethylpropionitrile), 2,2′-azobis [2- (2-imidazolin-2-yl) Propane] and the like.
  • organic peroxides examples include benzoyl peroxide, t-butyl perbenzoate, cumene hydroperoxide, diisopropyl peroxydicarbonate, di-n-propyl peroxydicarbonate, and di (2-ethoxyethyl) peroxy.
  • organic peroxides include benzoyl peroxide, t-butyl perbenzoate, cumene hydroperoxide, diisopropyl peroxydicarbonate, di-n-propyl peroxydicarbonate, and di (2-ethoxyethyl) peroxy.
  • examples thereof include dicarbonate, t-butyl peroxyneodecanoate, t-butyl peroxybivalate, (3,5,5-trimethylhexanoyl) peroxide, dipropionyl peroxide, diacetyl peroxide and the like.
  • the weight average molecular weight of the resulting polymer can be adjusted by adding a chain transfer agent such as 2-mercaptoethanol.
  • the light diffusing fine particles, and optionally the crosslinking agent (B), and additives are added to the solution of the (meth) acrylic acid ester polymer (A).
  • an adhesive composition P (coating solution) diluted with a solvent is obtained.
  • the dilution solvent examples include aliphatic hydrocarbons such as hexane, heptane, and cyclohexane, aromatic hydrocarbons such as toluene and xylene, halogenated hydrocarbons such as methylene chloride and ethylene chloride, methanol, ethanol, propanol, butanol, Alcohols such as 1-methoxy-2-propanol, ketones such as acetone, methyl ethyl ketone, 2-pentanone, isophorone and cyclohexanone, esters such as ethyl acetate and butyl acetate, cellosolve solvents such as ethyl cellosolve and the like are used.
  • aliphatic hydrocarbons such as hexane, heptane, and cyclohexane
  • aromatic hydrocarbons such as toluene and xylene
  • halogenated hydrocarbons such as methylene chloride and
  • the concentration / viscosity of the coating solution prepared in this manner is not particularly limited as long as it is within a coatable range, and can be appropriately selected according to the situation. For example, dilution is performed so that the concentration of the adhesive composition P is 10 to 40% by mass. In addition, when obtaining a coating solution, addition of a dilution solvent etc. is not a necessary condition, and if a viscosity etc. which can be coated with the adhesive composition P are not necessary, a dilution solvent does not need to be added.
  • the adhesive in this embodiment is formed from the adhesive composition P.
  • the pressure-sensitive adhesive can be usually formed by heat-treating the pressure-sensitive adhesive composition P. In addition, this heat processing can also serve as the drying process at the time of volatilizing the dilution solvent of the adhesive composition P, etc.
  • the heating temperature of the heat treatment is preferably 50 to 150 ° C., particularly preferably 70 to 120 ° C. .
  • the heating time is preferably 30 seconds to 10 minutes, particularly preferably 50 seconds to 2 minutes.
  • a curing period of about 1 to 2 weeks may be provided at normal temperature (for example, 23 ° C., 50% RH).
  • the thickness of the pressure-sensitive adhesive layer 2 (value measured according to JIS K7130) is preferably 5 to 600 ⁇ m, particularly preferably 20 to 300 ⁇ m, and more preferably 50 It is preferably ⁇ 150 ⁇ m. Good adhesiveness is exhibited when the thickness of the pressure-sensitive adhesive layer 2 is 5 ⁇ m or more. Further, when pasted on an adherend having a step, the step following ability is exhibited. On the other hand, when the thickness of the pressure-sensitive adhesive layer 2 is 600 ⁇ m or less, workability is improved.
  • the pressure-sensitive adhesive layer 2 may be formed as a single layer or may be formed by laminating a plurality of layers.
  • release sheet 12a, 12b For example, a polyethylene film, a polypropylene film, a polybutene film, a polybutadiene film, a polymethylpentene film, a polyvinyl chloride film, a vinyl chloride copolymer film, a polyethylene terephthalate film, Polyethylene naphthalate film, polybutylene terephthalate film, polyurethane film, ethylene vinyl acetate film, ionomer resin film, ethylene / (meth) acrylic acid copolymer film, ethylene / (meth) acrylic acid ester copolymer film, polystyrene film, A polycarbonate film, a polyimide film, a fluororesin film, or the like is used. These crosslinked films are also used. Furthermore, these laminated films may be sufficient.
  • the release surface of the release sheets 12a and 12b (particularly the surface in contact with the pressure-sensitive adhesive layer 2) is preferably subjected to a release treatment.
  • the release agent used for the release treatment include alkyd, silicone, fluorine, unsaturated polyester, polyolefin, and wax release agents.
  • one release sheet is preferably a heavy release release sheet having a high release force
  • the other release sheet is preferably a light release release sheet having a low release force.
  • the thickness of the release sheets 12a and 12b is not particularly limited, but is usually about 20 to 150 ⁇ m.
  • the coating liquid of the above-mentioned pressure-sensitive adhesive composition P is applied to the release surface of one release sheet 12a (or 12b) and subjected to heat treatment, thereby applying a coating layer Then, the release surface of the other release sheet 12b (or 12a) is overlaid on the coating layer.
  • a curing period is required, a curing period is set, and when the curing period is unnecessary, the coating layer becomes the pressure-sensitive adhesive layer 2 as it is. Thereby, the said double-sided adhesive sheet 1 is obtained.
  • the conditions for the heat treatment and curing are as described above.
  • a coating layer is formed by applying a coating solution of the above-mentioned pressure-sensitive adhesive composition P to the release surface of one release sheet 12a and performing a heat treatment.
  • the release sheet 12a is obtained.
  • the coating liquid of the said adhesive composition P is apply
  • the peeling sheet 12a with an application layer and the peeling sheet 12b with an application layer are bonded together so that both application layers may mutually contact.
  • the curing period is necessary, the curing period is set, and when the curing period is unnecessary, the above-mentioned laminated application layer becomes the pressure-sensitive adhesive layer 2 as it is. Thereby, the said double-sided adhesive sheet 1 is obtained. According to this production example, even when the pressure-sensitive adhesive layer 2 is thick, it can be produced stably.
  • a bar coating method, a knife coating method, a roll coating method, a blade coating method, a die coating method, a gravure coating method, or the like can be used.
  • the double-sided adhesive sheet 1 which concerns on this embodiment can be used for the laminated body which has a circuit pattern of a transparent conductive film, and can be preferably used especially for a capacitive touch panel etc.
  • the pressure-sensitive adhesive layer 2 may be present at any position between the touch panel display module and the cover material. For example, it can be located between two transparent conductive films, between a transparent conductive film and a cover material, and between a transparent conductive film and a display module. Even if the pressure-sensitive adhesive layer 2 is present at any of these positions, the circuit pattern of the transparent conductive film becomes difficult to see due to the excellent bone-inhibiting effect of the pressure-sensitive adhesive layer 2.
  • the capacitive touch panel 10 shown in FIG. 2 can be manufactured.
  • the touch panel 10 includes a display module 4, a first film sensor 5 a laminated thereon via an adhesive layer 2, and a second film sensor 5 b laminated thereon via an adhesive layer 2.
  • stacked through the adhesive layer 2 on it is comprised.
  • the three pressure-sensitive adhesive layers 2 in the touch panel 10 are the pressure-sensitive adhesive layers 2 of the double-sided pressure-sensitive adhesive sheet 1, but are not limited to this, and at least one pressure-sensitive adhesive layer 2 is the double-sided pressure-sensitive adhesive sheet 1.
  • the pressure-sensitive adhesive layer 2 may be used.
  • the 1 or 2 adhesive layer 2 in the touch panel 10 is the adhesive layer 2 of the said double-sided adhesive sheet 1
  • another adhesive layer is comprised from a desired adhesive.
  • a desired adhesive what does not contain the light-diffusion fine particle of the adhesive which comprises the adhesive layer 2 mentioned above can be illustrated.
  • Examples of the display module 4 include a liquid crystal (LCD) module, a light emitting diode (LED) module, an organic electroluminescence (organic EL) module, and electronic paper.
  • LCD liquid crystal
  • LED light emitting diode
  • organic EL organic electroluminescence
  • the first film sensor 5a and the second film sensor 5b are each generally composed of a base film 51 and a patterned transparent conductive film 52, respectively.
  • a base film 51 For example, a polyethylene terephthalate film, a polycarbonate film, a polymethylmethacrylate film, a polycycloolefin film, a polyolefin film, a triacetylcellulose film etc. are used.
  • Examples of the transparent conductive film 52 include metals such as platinum, gold, silver and copper, oxides such as tin oxide, indium oxide, cadmium oxide, zinc oxide and zinc dioxide, tin-doped indium oxide (ITO), and zinc oxide-doped oxide.
  • oxides such as tin oxide, indium oxide, cadmium oxide, zinc oxide and zinc dioxide, tin-doped indium oxide (ITO), and zinc oxide-doped oxide.
  • Examples include composite oxides such as indium, fluorine-doped indium oxide, antimony-doped tin oxide, fluorine-doped tin oxide, and aluminum-doped zinc oxide, and non-oxidized compounds such as chalcogenide, lanthanum hexaboride, titanium nitride, and titanium carbide. Among these, those made of tin-doped indium oxide (ITO) are preferable.
  • One of the transparent conductive film 52 of the first film sensor 5a and the transparent conductive film 52 of the second film sensor 5b normally constitutes a circuit pattern in the X-axis direction, and the other constitutes a circuit pattern in the Y-axis direction. .
  • the transparent conductive film 52 of the first film sensor 5a in the present embodiment is located on the upper side (the cover material 6 side) of the first film sensor 5a in FIG. 2, but is not limited thereto.
  • the first film sensor 5a may be located on the lower side (display module 4 side).
  • the transparent conductive film 52 of the 2nd film sensor 5b is located in the lower side (display body module 4 side) of the 2nd film sensor 5b in FIG. 2, it is not limited to this. , May be positioned above the second film sensor 5b (on the cover material 6 side).
  • the cover material 6 is mainly composed of a glass plate or a plastic plate.
  • the glass plate is not particularly limited. For example, chemically strengthened glass, alkali-free glass, quartz glass, soda lime glass, barium / strontium-containing glass, aluminosilicate glass, lead glass, borosilicate glass, barium borosilicate glass. Etc.
  • the plastic plate is not particularly limited, and examples thereof include an acrylic plate made of polymethyl methacrylate and the like, and a polycarbonate plate.
  • a functional layer such as a hard coat layer, an antireflection layer, or an antiglare layer may be provided on one side or both sides of the glass plate or plastic plate, or a hard coat film, an antireflection film, or an antiglare film.
  • Such optical members may be laminated.
  • the cover material 6 has a step on the surface on the pressure-sensitive adhesive layer 2 side, and specifically has a step due to the presence or absence of the printing layer 7.
  • the printing layer 7 is generally formed in a frame shape on the pressure-sensitive adhesive layer 2 side of the cover material 6.
  • the material constituting the printing layer 7 is not particularly limited, and a known material for printing is used.
  • the thickness of the printing layer 7, that is, the height of the step, is preferably 3 to 45 ⁇ m, more preferably 5 to 35 ⁇ m, particularly preferably 7 to 25 ⁇ m, and preferably 7 to 15 ⁇ m. Further preferred.
  • the thickness of the printing layer 7 (height of the step) is preferably 50% or less, particularly preferably 5 to 40%, more preferably 10 to 30%. Preferably there is.
  • the pressure-sensitive adhesive layer 2 follows the step due to the printing layer 7 well, and it is possible to suppress the occurrence of floating or bubbles in the vicinity of the step. .
  • first, second and third double-sided pressure-sensitive adhesive sheets 1 are prepared. First, one release sheet 3a (or 3b) is peeled from the first double-sided pressure-sensitive adhesive sheet 1, and the exposed adhesive layer 2 is in contact with the patterned transparent conductive film 52 of the film sensor 5a. Bonding with the sensor 5a. Next, the other release sheet 3b (or 3a) is peeled from the first double-sided pressure-sensitive adhesive sheet 1, and the exposed pressure-sensitive adhesive layer 2 is in contact with the patterned transparent conductive film 52 of the film sensor 5b. Paste with 5b. Thereby, the laminated body by which the film sensor 5a, the adhesive layer 2, and the film sensor 5b are laminated
  • one release sheet 3a (or 3b) is peeled from the second double-sided pressure-sensitive adhesive sheet 1, and the exposed pressure-sensitive adhesive layer 2 is replaced with the surface on the film sensor 5a side of the laminate (base film of the film sensor 5a). 51 exposed surface). Also, one release sheet 3a (or 3b) is peeled from the third double-sided pressure-sensitive adhesive sheet 1, and the exposed pressure-sensitive adhesive layer 2 is opposite to the side where the pressure-sensitive adhesive layer 2 is laminated in the laminate. Bonding to the surface (exposed surface of the base film 51 of the film sensor 5b).
  • the other release sheet 3b (or 3a) is peeled from the third double-sided pressure-sensitive adhesive sheet 1, and the printed layer 7 side of the cover material 6 is in contact with the pressure-sensitive adhesive layer 2 with respect to the exposed pressure-sensitive adhesive layer 2.
  • the cover material 6 is bonded. Thereby, the structure by which the cover material 6, the adhesive layer 2, the film sensor 5b, the adhesive layer 2, the film sensor 5a, the adhesive layer 2, and the peeling sheet 3b (or 3a) are laminated
  • the release sheet 3b (or 3a) is peeled from the structure, and the structure is bonded to the display module 4 so that the exposed adhesive layer 2 is in contact with the display module 4. Thereby, the touch panel 10 shown in FIG. 2 is manufactured.
  • the pressure-sensitive adhesive layer 2 in contact with the cover material 6 is composed of a pressure-sensitive adhesive composition P containing a (meth) acrylic acid ester polymer (A) as a pressure-sensitive adhesive component, and the (meth) acrylic acid ester polymer (A) is
  • the pressure-sensitive adhesive layer 2 has the predetermined composition and molecular weight and has a predetermined thickness
  • the pressure-sensitive adhesive layer 2 is excellent in step following ability.
  • it is difficult to form a gap or a bubble between the step formed by the printing layer 7 and the pressure-sensitive adhesive layer 2 and the pressure-sensitive adhesive layer 2 forms the step. Can be filled.
  • even when the touch panel 10 is subjected to a high temperature and high humidity condition it is possible to prevent bubbles and the like from being generated near the step.
  • the pressure-sensitive adhesive layer 2 is composed of a pressure-sensitive adhesive composition P containing a (meth) acrylic acid ester polymer (A) as a pressure-sensitive adhesive component, and the (meth) acrylic acid ester polymer (A) is the predetermined one described above.
  • the pressure-sensitive adhesive layer 2 is excellent in moisture and heat whitening resistance, and whitening when the touch panel 10 returns to room temperature after being placed in a high temperature and high humidity condition is suppressed.
  • the touch panel 10 may include other layers that have an effect of suppressing bone appearance in addition to the above layers.
  • a known refractive index adjustment layer index matching layer
  • one of the release sheets 3a and 3b in the double-sided pressure-sensitive adhesive sheet 1 may be omitted.
  • Example 1 Preparation of (meth) acrylic acid ester copolymer 90 parts by mass of n-butyl acrylate and 10 parts by mass of acrylic acid were copolymerized to prepare a (meth) acrylic acid ester polymer (A). When the molecular weight of this (meth) acrylic acid ester polymer (A) was measured by the method described later, it was a weight average molecular weight (Mw) of 400,000.
  • Adhesive Composition 100 parts by mass (solid content converted value; the same shall apply hereinafter) of the (meth) acrylic acid ester polymer (A) obtained in the above step (1), and a crosslinking agent (B) (epoxy crosslinking agent) ) 1,3-bis (N, N′-diglycidylaminomethyl) cyclohexane (manufactured by Mitsubishi Gas Chemical Company, product name “TETRAD C-5”) 0.057 parts by mass and 3 as a silane coupling agent -From 0.25 part by mass of glycidoxypropyltrimethoxysilane (manufactured by Shin-Etsu Chemical Co., Ltd., product name "KBM-403”) and a silicon-containing compound having an intermediate structure between inorganic and organic as light diffusion fine particles And 0.1 part by mass of fine particles (Momentive Performance Materials Japan, trade name “Tospearl 120”, average particle size: 2.0 ⁇ m, refractive index: 1.42), Min
  • Table 1 shows the composition of the adhesive composition. Details of the abbreviations and the like described in Table 1 are as follows.
  • (Meth) acrylic acid ester polymer (A)] BA: n-butyl acrylate AA: acrylic acid 2EHA: 2-ethylhexyl acrylate MMA: methyl methacrylate HEA: 2-hydroxyethyl acrylate
  • (B)] Epoxy: 1,3-bis (N, N′-diglycidylaminomethyl) cyclohexane (Mitsubishi Gas Chemical Co., Ltd., product name “TETRAD C-5”)
  • Isocyanate Xylylene diisocyanate-based crosslinking agent (product name “BHS8515” manufactured by Toyo Ink Co., Ltd.)
  • Tospearl 120 Fine particles composed of a silicon-containing compound having an intermediate structure between inorganic and organic (made by Momentive Performance Materials Japan, trade name “Tospear
  • a coating solution of the obtained pressure-sensitive adhesive composition was prepared from a heavy release type release sheet (product name “SP-PET752150” manufactured by Lintec Corporation) in which one side of a polyethylene terephthalate film was peeled with a silicone-based release agent. The surface to be peeled was coated with a knife coater so that the thickness after drying was 25 ⁇ m, and then heat-treated at 90 ° C. for 1 minute to form a coating layer.
  • SP-PET752150 manufactured by Lintec Corporation
  • a release treatment of a light release type release sheet (product name “SP-PET382120” manufactured by Lintec Co., Ltd.) in which one side of a polyethylene terephthalate film was release-treated with a silicone-based release agent was applied to the obtained adhesive composition coating solution.
  • the surface was coated with a knife coater so that the thickness after drying was 25 ⁇ m, and then heat-treated at 90 ° C. for 1 minute to form a coating layer.
  • the heavy release type release sheet with the coating layer obtained above and the light release type release sheet with the coating layer obtained above were bonded so that both coating layers were in contact with each other.
  • a double-sided pressure-sensitive adhesive sheet having a structure of heavy release type release sheet / adhesive layer (thickness: 50 ⁇ m) / light release type release sheet was produced.
  • the thickness of the pressure-sensitive adhesive layer is a value measured using a constant pressure thickness measuring instrument (manufactured by Teclock, product name “PG-02”) in accordance with JIS K7130.
  • Examples 2 to 14, Comparative Examples 1 to 8 The type, ratio and polymerization average molecular weight (Mw) of each monomer constituting the (meth) acrylic acid ester polymer (A), the type and blending amount of the crosslinking agent (B), and the type and blending amount of the light diffusing fine particles are shown.
  • Mw polymerization average molecular weight
  • the above-mentioned weight average molecular weight (Mw) is a polystyrene-reduced weight average molecular weight measured under the following conditions (GPC measurement) using gel permeation chromatography (GPC).
  • GPC measurement device manufactured by Tosoh Corporation, HLC-8020 GPC column (passed in the following order): TSK guard column HXL-H manufactured by Tosoh Corporation TSK gel GMHXL ( ⁇ 2) TSK gel G2000HXL ⁇ Measurement solvent: Tetrahydrofuran ⁇ Measurement temperature: 40 ° C.
  • the obtained laminate was dipped in hydrochloric acid adjusted to 1 mol / l for 2 minutes to etch the ITO film portion on which the polyimide adhesive tape was not applied. Subsequently, the laminate was sufficiently washed with ion-exchanged water, dried at 120 ° C. for 10 minutes, and then the polyimide adhesive tape was peeled off from the transparent conductive film. As a result, a transparent conductive film was obtained in which the ITO film was patterned so that the 1 cm wide ITO film portion and the 1 cm wide ITO film non-existing portion were alternately repeated.
  • the transparent conductive film patterned with the ITO film as described above was annealed at 150 ° C. for 90 minutes to crystallize the patterned ITO film.
  • the light release type release sheet was peeled off.
  • the exposed adhesive layer was bonded to the patterned ITO film (crystallization) of the transparent conductive film obtained above.
  • the heavy release release sheet was peeled off from the laminate, and the exposed pressure-sensitive adhesive layer was attached to a 0.5 mm thick glass plate made of alkali glass, which was used as a sample.
  • the sample was pressurized in an autoclave at 0.5 MPa and 50 ° C. for 30 minutes, and then placed in an environment of 85 ° C. and 85% RH for 72 hours. Then, it was confirmed whether the circuit pattern was visually visible from the polyethylene terephthalate film side, and the bone appearance suppression effect was evaluated according to the following criteria. The results are shown in Table 2.
  • X A pattern is visible.
  • a stepped glass plate having a thickness of any one of 5 ⁇ m, 10 ⁇ m, 15 ⁇ m, and 20 ⁇ m was produced.
  • the light release type release sheet was peeled off from the double-sided PSA sheet obtained in Examples and Comparative Examples, and the exposed PSA layer was made of a polyethylene terephthalate film (PET A4300, manufactured by Toyobo Co., Ltd., thickness: 100 ⁇ m) having an easy adhesion layer. It bonded to the easily bonding layer.
  • PET A4300 polyethylene terephthalate film
  • the heavy release type release sheet was peeled off to expose the pressure-sensitive adhesive layer.
  • a laminator product name “LPD3214”, manufactured by Fuji Plastics Co., Ltd.
  • the laminate is laminated on each stepped glass plate so that the adhesive layer covers the entire frame-like print, and this is used as an evaluation sample. did.
  • the pressure-sensitive adhesive layer of the double-sided PSA sheet obtained in Examples and Comparative Examples is a polyethylene terephthalate film provided with a transparent conductive film made of tin-doped indium oxide (ITO) on one side (Oike Industry Co., Ltd., ITO film, thickness : 125 ⁇ m) transparent conductive film and polymethylmethacrylate (PMMA) acrylic plate (Mitsubishi Gas Chemical Co., Ltd., Iupilon sheet MR200, thickness: 1 mm) or polycarbonate (PC) plate (Mitsubishi Gas Chemical Co., Ltd., Iupilon) -Sheet MR58, thickness: 1 mm) to obtain a laminate.
  • ITO tin-doped indium oxide
  • PMMA polymethylmethacrylate
  • the obtained laminate was autoclaved for 30 minutes under the conditions of 50 ° C. and 0.5 MPa, and then allowed to stand at normal pressure, 23 ° C. and 50% RH for 15 hours. Subsequently, it was stored for 72 hours under 85 ° C. and 85% RH durability conditions. Thereafter, it was visually confirmed whether or not the pressure-sensitive adhesive layer had bubbles, floating or peeling, and blister resistance was evaluated according to the following criteria. The results are shown in Table 2. ⁇ : No bubbles, no floating and peeling, or only bubbles with a diameter of 0.1 mm or less were generated. X: Bubbles with a diameter of more than 0.1 mm, floating or peeling occurred.
  • Test Example 5 (Moisture and heat whitening evaluation) Prepare two sheets of polyethylene terephthalate film (made by Oike Kogyo Co., Ltd., ITO film, thickness: 125 ⁇ m) with a transparent conductive film made of tin-doped indium oxide (ITO) on one side.
  • the pressure-sensitive adhesive layer was sandwiched between the double-sided pressure-sensitive adhesive sheets obtained in Examples or Comparative Examples, and the laminate was used as a sample.
  • the haze value (haze value before wet heat condition) of the obtained sample was measured.
  • the sample was stored for 72 hours under wet heat conditions of 85 ° C. and 85% RH. Then, it returned to the atmosphere of 23 degreeC and 50% RH (normal temperature normal humidity), and the haze value (haze value after wet heat conditions) of the said sample was measured within 30 minutes.
  • the haze value was measured using a haze meter (manufactured by Nippon Denshoku Industries Co., Ltd., product name “NDH2000”) according to JIS K7136: 2000.
  • the haze value after the wet heat condition was calculated by subtracting the haze value before the wet heat condition from the haze value after the wet heat condition. The results are shown in Table 2. If this haze value rise is less than 1.0 point, it can be said that heat-and-moisture whitening resistance is good.
  • the pressure-sensitive adhesive layer of the double-sided PSA sheet obtained in the examples was excellent in bone appearance suppression performance, and had good step followability and moisture heat whitening resistance. Further, the pressure-sensitive adhesive layers of Examples 8 to 14 using a hydroxyl group-containing monomer and a hard monomer as monomer units constituting the (meth) acrylic acid ester polymer (A) were excellent in blister resistance.
  • the double-sided pressure-sensitive adhesive sheet of the present invention is very useful for forming a pressure-sensitive adhesive layer used in a capacitive touch panel.

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  • General Physics & Mathematics (AREA)
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JPWO2015146664A1 (ja) * 2014-03-28 2017-04-13 王子ホールディングス株式会社 両面粘着シートおよび光学部材
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WO2022124706A1 (ko) * 2020-12-10 2022-06-16 동우 화인켐 주식회사 광학용 양면 점착 시트

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