WO2011007861A1 - Ruban adhésif sensible à la pression, stratifié et dispositif d'affichage d'image - Google Patents

Ruban adhésif sensible à la pression, stratifié et dispositif d'affichage d'image Download PDF

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Publication number
WO2011007861A1
WO2011007861A1 PCT/JP2010/062048 JP2010062048W WO2011007861A1 WO 2011007861 A1 WO2011007861 A1 WO 2011007861A1 JP 2010062048 W JP2010062048 W JP 2010062048W WO 2011007861 A1 WO2011007861 A1 WO 2011007861A1
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sensitive adhesive
pressure
adhesive tape
group
monomer
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PCT/JP2010/062048
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English (en)
Japanese (ja)
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永井康晴
丸尾耕平
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積水化学工業株式会社
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Priority to KR1020127003971A priority Critical patent/KR101800470B1/ko
Priority to CN201080031369.9A priority patent/CN102471657B/zh
Priority to JP2010530197A priority patent/JPWO2011007861A1/ja
Publication of WO2011007861A1 publication Critical patent/WO2011007861A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • 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
    • C09J133/08—Homopolymers or copolymers of acrylic acid esters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • 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
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • C09J7/22—Plastics; Metallised plastics
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • C09J7/29—Laminated material
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • C09J7/38—Pressure-sensitive adhesives [PSA]
    • C09J7/381—Pressure-sensitive adhesives [PSA] based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
    • C09J7/385—Acrylic 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
    • C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
    • C09J2203/318—Applications of adhesives in processes or use of adhesives in the form of films or foils for the production of liquid crystal displays
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/10—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet
    • C09J2301/16—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the structure of the carrier layer
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
    • C09J2301/302—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier the adhesive being pressure-sensitive, i.e. tacky at temperatures inferior to 30°C

Definitions

  • the present invention relates to a pressure-sensitive adhesive tape that has high transparency, is excellent in adhesion to a polycarbonate plate and an acrylic plate, and can suppress floating peeling that occurs at the interface with the polycarbonate plate or the acrylic plate even under high temperature conditions. Moreover, this invention relates to the laminated body manufactured using this adhesive tape, and an image display apparatus.
  • a protective plate for protecting the surface is bonded to a display panel or a touch panel via a transparent adhesive layer.
  • a plate, an acrylic plate or the like is used.
  • the polycarbonate plate and the acrylic plate easily absorb moisture, and the moisture is vaporized under high temperature conditions to generate outgas. Therefore, under high temperature conditions, outgassing causes floating and peeling at the interface between the polycarbonate plate or acrylic plate and the pressure-sensitive adhesive layer, resulting in a poor appearance.
  • the molecular weight of the acrylic polymer forming the pressure-sensitive adhesive layer is appropriately adjusted, but this method sufficiently suppresses the floating off. It was difficult to obtain a pressure-sensitive adhesive layer.
  • a transparent double-sided pressure-sensitive adhesive tape or sheet has a transparent pressure-sensitive adhesive layer formed on both surfaces of a transparent substrate, and at least one surface of the transparent substrate.
  • a transparent double-sided pressure-sensitive adhesive tape or sheet in which the formed transparent pressure-sensitive adhesive layer is formed from a pressure-sensitive adhesive composition containing a specific acrylic polymer (a) and an oligomer (b) is described.
  • the acrylic polymer (a) is composed of a (meth) acrylic acid alkyl ester having 4 to 12 carbon atoms in the alkyl group as a main monomer component, and a carboxyl group-containing monomer as a monomer component.
  • the oligomer (b) is a polymer obtained when a homopolymer is formed.
  • An ethylenically unsaturated monomer having a glass transition temperature of 60 to 190 ° C. and having a cyclic structure is used as a main monomer component, and a carboxyl group-containing monomer is used as a monomer component in an amount of 3 to 10 to 100 parts by weight of the total monomer components. Further, it is an oligomer having a weight average molecular weight of 3000 to 6000.
  • Patent Document 1 describes that the transparent double-sided pressure-sensitive adhesive tape or sheet described in the same document is excellent in anti-floating property and further excellent in transparency and warpage prevention property.
  • the transparent double-sided pressure-sensitive adhesive tape or sheet described in Patent Document 1 uses a mixture of two types of polymers or oligomers, it has a problem that the compatibility of the two types of polymers or oligomers is not sufficient and becomes cloudy. Therefore, it has been difficult to realize a sufficiently high transparency to be applied to optical applications.
  • the present invention provides a pressure-sensitive adhesive tape that has high transparency, is excellent in adhesion to a polycarbonate plate and an acrylic plate, and can suppress floating peeling occurring at the interface with the polycarbonate plate or the acrylic plate even under high temperature conditions. Objective. Moreover, an object of this invention is to provide the laminated body manufactured using this adhesive tape, and an image display apparatus.
  • the present invention is a pressure-sensitive adhesive tape having a pressure-sensitive adhesive layer made of a pressure-sensitive adhesive composition containing a copolymer, wherein the copolymer has a bicyclo ring structure and one olefinic double bond in the molecule.
  • the proportion of the structural unit derived from the monomer having a bicyclo ring structure and one olefinic double bond is 10 to 60 parts by weight and represented by the general formula (1) in 100 parts by weight of the copolymer.
  • the proportion of the structural unit derived from the (meth) acrylic acid ester monomer having the structure is 30 to 90 parts by weight, the total light transmittance in the visible light wavelength region is 90% or more, and Value is an adhesive tape is not more than 1%.
  • R 1 represents a hydrogen atom or a methyl group
  • R 2 represents an alkyl group having 3 to 14 carbon atoms.
  • the hydrogen atom of the alkyl group represented by R 2 may be substituted with a cycloalkyl group.
  • the floating peeling that occurs at the interface between the polycarbonate plate or acrylic plate and the pressure-sensitive adhesive layer is considered to be caused by outgassing from the polycarbonate plate or acrylic plate, and bubbles growing due to the gas pressure. . Therefore, in order to suppress the float-off, it is conceivable to prevent the growth of bubbles at the interface with the polycarbonate plate or the acrylic plate by increasing the adhesion or adhesive force of the pressure-sensitive adhesive layer to the polycarbonate plate and the acrylic plate.
  • the present inventors include a structural unit derived from a monomer having a bicyclo ring structure and one olefinic double bond in the molecule, and a structural unit derived from a (meth) acrylic acid ester monomer having a specific structure.
  • a pressure-sensitive adhesive layer with dramatically improved adhesion to polycarbonate plates and acrylic plates can be formed.
  • the present inventors have a pressure-sensitive adhesive layer composed of such a pressure-sensitive adhesive composition, and a pressure-sensitive adhesive tape having a total light transmittance and a haze value within a predetermined range has high transparency, and is a polycarbonate plate or a high-temperature condition.
  • the present inventors have found that floating peeling occurring at the interface with the acrylic plate can be suppressed, and have completed the present invention.
  • (meth) acryl means acryl or methacryl.
  • the pressure-sensitive adhesive tape of the present invention has a pressure-sensitive adhesive layer made of a pressure-sensitive adhesive composition containing a copolymer.
  • the copolymer has a structural unit derived from a monomer having a bicyclo ring structure and one olefinic double bond in the molecule.
  • the pressure-sensitive adhesive tape of the present invention has an adhesive force to a polycarbonate plate and an acrylic plate. Greatly improved.
  • the bicyclo ring structure is not particularly limited, and examples of the functional group having the bicyclo ring structure include a bicyclo [1.1.0] butyl group, a bicyclo [1.1.1] pentyl group, and a bicyclo [2.1.
  • a functional group having a structure substituted with a group may be one place and may be multiple places.
  • these functional groups having a bicyclo ring structure a norbornyl group and an isobornyl group are preferable, and an isobornyl group is particularly preferable.
  • the olefinic double bond is not particularly limited, and examples of the functional group having the olefinic double bond include a (meth) acryloyl group, a vinyl group, and an allyl group.
  • a (meth) acryloyl group is preferable.
  • (meth) acryloyl means acryloyl or methacryloyl.
  • the monomer having a bicyclo ring structure and one olefinic double bond in the molecule is not particularly limited, but isobornyl (meth) acrylate having an isobornyl group and a (meth) acryloyl group is more preferable.
  • (meth) acrylate means an acrylate or a methacrylate.
  • the proportion of structural units derived from a monomer having a bicyclo ring structure and one olefinic double bond in the molecule in 100 parts by weight of the copolymer is 10 to 60 parts by weight.
  • the proportion of the structural unit derived from the monomer having a bicyclo ring structure and one olefinic double bond in the molecule is less than 10 parts by weight, the resulting adhesive tape has an adhesive strength to the polycarbonate plate and the acrylic plate. And cannot sufficiently prevent the growth of bubbles at the interface with the polycarbonate plate or acrylic plate under high temperature conditions.
  • the proportion of structural units derived from a monomer having a bicyclo ring structure and one olefinic double bond in the molecule exceeds 60 parts by weight, the glass transition temperature of the resulting copolymer increases, and the copolymer
  • the pressure-sensitive adhesive tape produced using the adhesive has poor adhesion to the polycarbonate plate and the acrylic plate, and cannot sufficiently prevent the growth of bubbles at the interface with the polycarbonate plate or the acrylic plate under high temperature conditions.
  • the proportion of structural units derived from a monomer having a bicyclo ring structure and one olefinic double bond in the molecule in 100 parts by weight of the copolymer is preferably 15 to 55 parts by weight, More preferably, it is 50 parts by weight.
  • the copolymer has a structural unit derived from a (meth) acrylic acid ester monomer having a structure represented by the following general formula (1).
  • R 1 represents a hydrogen atom or a methyl group
  • R 2 represents an alkyl group having 3 to 14 carbon atoms.
  • the hydrogen atom of the alkyl group represented by R 2 may be substituted with a cycloalkyl group.
  • the glass transition temperature of the obtained copolymer is increased, and the pressure-sensitive adhesive tape produced using the copolymer is the initial of the pressure-sensitive adhesive layer.
  • the wettability is lowered, the adhesion to the polycarbonate plate and the acrylic plate is lowered, and the growth of bubbles at the interface with the polycarbonate plate or the acrylic plate cannot be sufficiently prevented under high temperature conditions.
  • the R 2 alkyl group preferably has 4 to 12 carbon atoms.
  • the hydrogen atom of the alkyl group of R 2 may be substituted with a cycloalkyl group.
  • the cycloalkyl group is not particularly limited, and examples thereof include a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, and a cyclooctyl group.
  • the (meth) acrylic acid ester monomer having the structure represented by the general formula (1) is not particularly limited.
  • the resulting pressure-sensitive adhesive tape has cohesive strength, initial adhesiveness, and adhesiveness of the pressure-sensitive adhesive layer in addition to the pressure-sensitive adhesive force on the polycarbonate plate and acrylic plate. Etc. are also improved.
  • the (meth) acrylic acid ester monomer having a structure represented by the above general formula (1) is 2-ethylhexyl ( It is preferable to contain at least one (meth) acrylic acid ester monomer selected from the group consisting of (meth) acrylate, octyl (meth) acrylate and butyl (meth) acrylate.
  • the proportion of the structural unit derived from the (meth) acrylic acid ester monomer having the structure represented by the general formula (1) in 100 parts by weight of the copolymer is 30 to 90 parts by weight.
  • the proportion of the structural unit derived from the (meth) acrylic acid ester monomer having the structure represented by the general formula (1) is less than 30 parts by weight, the resulting adhesive tape has a low temperature elastic modulus of the adhesive layer. The initial wettability is lowered, the adhesion to the polycarbonate plate and the acrylic plate is lowered, and the growth of bubbles at the interface with the polycarbonate plate or the acrylic plate cannot be sufficiently prevented under high temperature conditions.
  • the ratio of the structural unit derived from the (meth) acrylic acid ester monomer having the structure represented by the general formula (1) exceeds 90 parts by weight, the cohesive force of the pressure-sensitive adhesive layer is reduced in the obtained pressure-sensitive adhesive tape.
  • the processability is reduced, and the proportion of structural units derived from monomers having a bicyclo ring structure and one olefinic double bond in the molecule in the copolymer is relatively reduced.
  • the adhesive strength of the adhesive tape to the polycarbonate plate and acrylic plate is reduced.
  • the proportion of the (meth) acrylic acid ester monomer having the structure represented by the general formula (1) in 100 parts by weight of the copolymer is preferably 50 to 85 parts by weight.
  • the copolymer may further have structural units derived from other monomers.
  • the copolymer has a structural unit derived from the other monomer, the intermolecular interaction of the obtained copolymer is increased, and the pressure-sensitive adhesive tape produced using the copolymer has a pressure-sensitive adhesive layer. The cohesive strength of increases.
  • the other monomer has a polar group, the pressure-sensitive adhesive tape obtained by the interaction between the polar group and the surface of the polycarbonate plate or acrylic plate increases the interfacial adhesive force of the pressure-sensitive adhesive layer. .
  • the other monomer is not particularly limited, but at least one polar group selected from the group consisting of a carboxyl group, a hydroxyl group, an amide group, an amino group, an epoxy group, an aldehyde group and an isocyanate group in the molecule and one olefinic group.
  • Monomers having a heavy bond are preferred.
  • the cohesive force of the pressure-sensitive adhesive layer of the resulting pressure-sensitive adhesive tape is increased. Therefore, a monomer having a carboxyl group and one olefinic double bond in the molecule, a hydroxyl group and one in the molecule.
  • a monomer having an olefinic double bond is more preferred.
  • the monomer having a carboxyl group and one olefinic double bond in the molecule is not particularly limited.
  • the copolymer has a structural unit derived from a monomer having a carboxyl group and one olefinic double bond in the molecule, a carboxyl group and one in the molecule occupying 100 parts by weight of the copolymer.
  • the proportion of the structural unit derived from the monomer having an olefinic double bond is preferably 2 parts by weight or less.
  • the pressure-sensitive adhesive layer of the pressure-sensitive adhesive tape is made of metal such as ITO or metal oxide When a metal thin film containing an object is used as an adherend, the metal thin film may be easily deteriorated.
  • the proportion of the constituent component derived from the monomer having a carboxyl group and one olefinic double bond in the molecule in 100 parts by weight of the copolymer is more preferably 1 part by weight or less. More preferably, it is at most parts by weight.
  • the said copolymer does not need to have the structural unit derived from the monomer which has a carboxyl group and one olefinic double bond in the said molecule
  • the acid component in the copolymer contained in the adhesive layer is a cause of deterioration of the metal thin film when a metal thin film containing a metal or metal oxide such as ITO is used as an adherend. Become.
  • the copolymer does not contain an acid component such as a structural unit derived from a monomer having a carboxyl group and one olefinic double bond in the molecule, the cohesive force is high, even under high temperature conditions. It is difficult to obtain a highly reliable pressure-sensitive adhesive layer.
  • the copolymer is a structural unit derived from a monomer having a bicyclo ring structure and one olefinic double bond in the molecule, and the general formula (1).
  • the pressure-sensitive adhesive layer has adhesive strength, cohesive strength, Excellent initial adhesion and adhesion, and high reliability even under high temperature conditions. Therefore, the pressure-sensitive adhesive tape of the present invention can maintain high reliability even under high temperature conditions and can suppress deterioration of a metal thin film containing a metal such as ITO or a metal oxide.
  • the monomer having a hydroxyl group and one olefinic double bond in the molecule is not particularly limited.
  • 2-hydroxyethyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) An acrylate etc. are mentioned.
  • the proportion of the structural unit derived from the other monomer in 100 parts by weight of the copolymer is not particularly limited, but is 20 parts by weight or less. It is preferable. When the proportion of the structural unit derived from the other monomer exceeds 20 parts by weight, the resulting adhesive tape has reduced initial wettability of the pressure-sensitive adhesive layer, reduced adhesion to the polycarbonate plate and the acrylic plate, Under high temperature conditions, the growth of bubbles at the interface with the polycarbonate plate or acrylic plate may not be sufficiently prevented.
  • the proportion of structural units derived from the other monomers in 100 parts by weight of the copolymer is more preferably 15 parts by weight or less.
  • the method for producing the copolymer is not particularly limited.
  • the monomer has a bicyclo ring structure and one olefinic double bond in the molecule, and has a structure represented by the general formula (1) ( Examples thereof include a method in which a monomer mixture containing a (meth) acrylic acid ester monomer and the above-mentioned other monomer blended as necessary is subjected to radical polymerization in the presence of a polymerization initiator.
  • the said polymerization method is not specifically limited, For example, conventionally well-known polymerization methods, such as solution polymerization, emulsion polymerization, suspension polymerization, and block polymerization, can be used.
  • the solvent used for the solution polymerization is not particularly limited, and examples thereof include ethyl acetate, toluene, dimethyl sulfoxide, ethanol, acetone, diethyl ether and the like.
  • the compounding quantity of the solvent used for the said solution polymerization is not specifically limited, A preferable minimum is 25 weight part with respect to 100 weight part of said monomer mixtures, A preferable upper limit is 300 weight part.
  • the blending amount of the solvent is less than 25 parts by weight, the molecular weight distribution of the obtained copolymer is widened, and the adhesive tape produced using the copolymer has an adhesive force and adhesion to a polycarbonate plate and an acrylic plate. The cohesive force of the agent layer may be reduced, and the growth of bubbles at the interface with the polycarbonate plate or acrylic plate may not be sufficiently prevented under high temperature conditions.
  • the amount of the solvent exceeds 300 parts by weight, it may be necessary to remove the solvent when preparing the pressure-sensitive adhesive composition using the resulting copolymer and producing a pressure-sensitive adhesive tape.
  • the said polymerization initiator is not specifically limited, For example, a persulfate, an organic peroxide, an azo compound etc. are mentioned. Among these, an azo compound is preferable in consideration of the influence on the metal thin film when a metal thin film containing a metal such as ITO or a metal oxide is used as an adherend.
  • the persulfate is not particularly limited, and examples thereof include potassium persulfate, sodium persulfate, and ammonium persulfate.
  • the organic peroxide is not particularly limited.
  • the azo compound is not particularly limited.
  • These polymerization initiators may be used alone or in combination of two or more.
  • the blending amount of the polymerization initiator is not particularly limited, but is preferably 0.02 to 0.5 parts by weight with respect to 100 parts by weight of the monomer mixture.
  • the blending amount of the polymerization initiator is less than 0.02 parts by weight, the polymerization reaction may be insufficient, or the polymerization reaction may take a long time.
  • the blending amount of the polymerization initiator exceeds 0.5 parts by weight, the weight average molecular weight of the obtained copolymer may become too low or the molecular weight distribution may become too wide.
  • the pressure-sensitive adhesive tape produced by the above method may reduce the adhesion to the polycarbonate plate and the acrylic plate and the cohesive strength of the pressure-sensitive adhesive layer, and sufficiently prevent the growth of bubbles at the interface with the polycarbonate plate or the acrylic plate under high temperature conditions. There are things that cannot be done.
  • the weight average molecular weight of the copolymer is not particularly limited, but is preferably 200,000 to 1,500,000.
  • the weight average molecular weight of the copolymer is less than 200,000, the resulting pressure-sensitive adhesive tape has a reduced high-temperature elastic modulus of the pressure-sensitive adhesive layer, so that bubbles grow at the interface with the polycarbonate plate or acrylic plate under high-temperature conditions. May not be sufficiently prevented.
  • the weight average molecular weight of the copolymer exceeds 1,500,000, the fluidity of the copolymer is lowered, and the adhesive tape produced using the copolymer has reduced adhesion to a polycarbonate plate and an acrylic plate.
  • the copolymer preferably has a weight average molecular weight of 300,000 to 1,200,000, and more preferably 400,000 to 900,000.
  • the weight average molecular weight means a value measured in terms of polystyrene by gel permeation chromatography (GPC).
  • GPC gel permeation chromatography
  • the diluted solution obtained by diluting the above copolymer 100 times with tetrahydrofuran (THF) is filtered through a filter, and the obtained filtrate is filtered with a column (for example, trade name “Waters” 2690 Separations Model "etc.).
  • the copolymer has a low viscosity, when forming a pressure-sensitive adhesive layer using a pressure-sensitive adhesive composition containing the copolymer, it should be coated well without being diluted with a solvent. It is easy to handle. Furthermore, since it can coat without using a solvent, it is easy to produce a thick adhesive layer, and the adhesive force with respect to the polycarbonate board and acrylic board of an adhesive layer can be improved.
  • the viscosity of the copolymer is not particularly limited, but the viscosity measured at 25 ° C. using a B-type viscometer (“B8U-type viscometer”, manufactured by Tokyo Keiki Co., Ltd.) is 500 to 100,000 Pa ⁇ s. Is preferred.
  • the pressure-sensitive adhesive composition may contain a crosslinking agent in addition to the copolymer.
  • a crosslinked structure can be formed in the copolymer.
  • the gel fraction of the adhesive layer of the adhesive tape obtained can be adjusted by adjusting the kind and quantity of the said crosslinking agent suitably.
  • the said crosslinking agent is not specifically limited, For example, an isocyanate type crosslinking agent, an aziridine type crosslinking agent, an epoxy-type crosslinking agent, a metal chelate type crosslinking agent etc. are mentioned.
  • the pressure-sensitive adhesive composition contains at least one cross-linking agent selected from the group consisting of an isocyanate cross-linking agent and an epoxy-based cross-linking agent because performance such as heat resistance and durability is easily exhibited. Is preferred.
  • an aliphatic isocyanate type crosslinking agent is preferable.
  • examples of commercially available products include Coronate HX (manufactured by Nippon Polyurethane Co., Ltd.).
  • examples of commercially available products include Coronate HX (manufactured by Nippon Polyurethane Co., Ltd.).
  • examples of commercially available products include Denacol EX212 and Denacol EX214 (both manufactured by Nagase ChemteX Corporation).
  • the amount of the crosslinking agent is not particularly limited, but is preferably 0.1 to 10 parts by weight with respect to 100 parts by weight of the copolymer.
  • the blending amount of the crosslinking agent is less than 0.1 parts by weight, the copolymer is insufficiently crosslinked, and the resulting adhesive tape has reduced cohesive strength of the adhesive layer and processability. In addition, the growth of bubbles at the interface with the polycarbonate plate or acrylic plate may not be sufficiently prevented under high temperature conditions.
  • the blending amount of the crosslinking agent exceeds 10 parts by weight, the pressure-sensitive adhesive tape obtained may have reduced adhesive strength and initial adhesion to the polycarbonate plate and the acrylic plate.
  • the amount of the crosslinking agent blended is more preferably 0.3 to 3.0 parts by weight with respect to 100 parts by weight of the copolymer.
  • the pressure-sensitive adhesive composition may further contain a tackifier resin.
  • the tackifying resin is not particularly limited, and examples thereof include a xylene resin, a phenol resin, a rosin resin, and a terpene resin. These tackifier resins may be used alone or in combination of two or more. Among these, a xylene resin is preferable, and an alkylphenol reaction product of the xylene resin is more preferable. Moreover, it is preferable to use a hydrogenated resin as the tackifier resin, and by using such a resin, the transparency of the adhesive tape can be increased.
  • the pressure-sensitive adhesive composition may further contain a silane coupling agent.
  • a silane coupling agent is not particularly limited.
  • the pressure-sensitive adhesive composition may further contain conventionally known additives as necessary.
  • the additive is not particularly limited as long as the transparency of the obtained pressure-sensitive adhesive tape is not impaired, and examples thereof include a filler and an antiaging agent.
  • the method for producing the pressure-sensitive adhesive composition is not particularly limited.
  • the copolymer and, if necessary, the crosslinking agent, the tackifying resin, the silane coupling agent, and the additive are mixed. And a method of stirring.
  • the pressure-sensitive adhesive layer has a shear storage modulus (G ′) at a measurement frequency of 10 Hz of 1 ⁇ 10 5 to 1 ⁇ 10 7 Pa at 20 ° C. and 3 ⁇ 10 4 to 1 ⁇ 10 5 Pa at 85 ° C. preferable. If the shear storage elastic modulus (G ′) is less than 1 ⁇ 10 5 Pa at 20 ° C. or less than 3 ⁇ 10 4 Pa at 85 ° C., the adhesive layer becomes more deformable with respect to stress, resulting in adhesion. Tape cutting processability may be reduced.
  • the pressure-sensitive adhesive layer has a shear storage modulus (G ′) at a measurement frequency of 10 Hz of 1.2 ⁇ 10 5 to 8 ⁇ 10 6 Pa at 20 ° C. and 3.2 ⁇ 10 4 to 9 ⁇ 10 4 Pa at 85 ° C. More preferably, it is 1.4 ⁇ 10 5 to 6 ⁇ 10 6 Pa at 20 ° C., and more preferably 3.4 ⁇ 10 4 to 8 ⁇ 10 4 Pa at 85 ° C.
  • the shear storage modulus (G ′) at a measurement frequency of 10 Hz is a frequency increase of 10 Hz using a dynamic viscoelasticity measurement device such as “DVA-200” manufactured by IT Measurement & Control Co., Ltd. It means the shear storage modulus (G ′) measured at a temperature rate of 5 ° C./min.
  • the pressure-sensitive adhesive layer has a maximum point in the dissipation factor (tan ⁇ ) obtained by dividing the shear loss modulus (G ′′) at the same measurement temperature by the shear storage modulus (G ′) in the temperature range of ⁇ 25 to 25 ° C. It is preferable to have.
  • the pressure-sensitive adhesive layer does not have a maximum point in the dissipation rate (tan ⁇ ) in the temperature range, and the dissipation rate (tan ⁇ ) of the pressure-sensitive adhesive layer exceeds 25 ° C.
  • the pressure-sensitive adhesive tape The initial wettability is reduced, the adhesion to the polycarbonate plate or the acrylic plate is lowered, and the floating peeling that occurs at the interface with the polycarbonate plate or the acrylic plate under high temperature conditions may not be suppressed.
  • the pressure-sensitive adhesive layer does not have a maximum point in the dissipation factor (tan ⁇ ) in the temperature range, and the dissipation factor (tan ⁇ ) of the pressure-sensitive adhesive layer is less than ⁇ 25 ° C.
  • the pressure-sensitive adhesive layer Becomes soft, the cutting processability of the pressure-sensitive adhesive tape deteriorates, and the adhesive at the cut end may adhere to the cutting blade and hinder processing.
  • the maximum dissipation factor (tan ⁇ ) is obtained by dividing the shear loss modulus (G ′′) at the same measurement temperature by the shear storage modulus (G ′). “Having a point” means shearing at ⁇ 25 to 25 ° C. at a frequency of 10 Hz and a heating rate of 5 ° C./minute using a dynamic viscoelasticity measuring device such as “DVA-200” manufactured by IT Measurement & Control Co., Ltd.
  • the gel fraction of the pressure-sensitive adhesive layer is not particularly limited, and it can suppress the peeling off occurring at the interface with the polycarbonate plate or the acrylic plate under high temperature conditions in any range. Although it can be appropriately adjusted according to the application, it is preferably 30 to 95% by weight. When the gel fraction of the pressure-sensitive adhesive layer is less than 30% by weight, the workability of the pressure-sensitive adhesive tape may be lowered. When the gel fraction of the pressure-sensitive adhesive layer exceeds 95% by weight, the pressure-sensitive adhesive tape is deteriorated in initial wettability of the pressure-sensitive adhesive layer, and the adhesion to the polycarbonate plate and the acrylic plate is lowered. In some cases, the growth of bubbles at the interface with the plate or the acrylic plate cannot be sufficiently prevented.
  • the gel fraction of the pressure-sensitive adhesive layer is more preferably 40 to 90% by weight.
  • the gel fraction can be measured by the following method. First, the pressure-sensitive adhesive tape of the present invention is cut into a flat rectangular shape of 50 mm ⁇ 25 mm to produce a test piece. After immersing the obtained test piece in ethyl acetate at 23 ° C. for 24 hours, the test piece is taken out from ethyl acetate through a 200-mesh stainless steel mesh and dried at 110 ° C. for 1 hour. And the weight of the test piece after drying is measured, and a gel fraction is computed using following formula (1). In addition, the release paper or release film is not laminated
  • the thickness of the pressure-sensitive adhesive layer is not particularly limited, but is preferably 20 to 500 ⁇ m.
  • the pressure-sensitive adhesive tape has a low adhesive force to the polycarbonate plate and the acrylic plate, and sufficiently hinders bubble growth at the interface with the polycarbonate plate or the acrylic plate under high temperature conditions. There are times when you can't.
  • the thickness of the pressure-sensitive adhesive layer exceeds 500 ⁇ m, the pressure-sensitive adhesive component oozes out and the handling property may be lowered.
  • the thickness of the pressure-sensitive adhesive layer is more preferably 20 to 300 ⁇ m.
  • the pressure-sensitive adhesive tape of the present invention has a total light transmittance in the visible light wavelength region of 90% or more and a haze value of 1% or less.
  • the total light transmittance in the visible light wavelength region is less than 90% or the haze value exceeds 1%, the transparency of the pressure-sensitive adhesive tape is lowered and it is difficult to apply to optical applications.
  • the pressure-sensitive adhesive tape of the present invention is preferably a pressure-sensitive adhesive tape for attaching to a polycarbonate plate or an acrylic plate. Furthermore, the adhesive tape of the present invention preferably has a 180 ° peeling force on a polycarbonate plate or an acrylic plate of 3 N / 25 mm or more at a peeling speed of 0.3 mm / min. When the peeling force is less than 3 N / 25 mm, the pressure-sensitive adhesive tape may not be able to sufficiently suppress floating peeling that occurs at the interface with the polycarbonate plate or acrylic plate under high temperature conditions.
  • the peeling speed of 0.3 mm / min is a speed suitable for evaluating a phenomenon in which floating peeling progresses when a polycarbonate plate or an acrylic plate is used as an adherend. Yes.
  • the 180 ° peeling force with respect to the polycarbonate plate or the acrylic plate is more preferably 3.2 N / 25 mm or more at a peeling speed of 0.3 mm / min, and further preferably 3.4 N / 25 mm or more. preferable.
  • 180 degree peeling force with respect to a polycarbonate board or an acrylic board in peeling speed 0.3mm / min means the value computed by the following method.
  • the adhesive tape is cut so as to have a planar shape of 25 mm ⁇ 100 mm.
  • One release polyethylene terephthalate film of the cut adhesive tape is peeled off to expose the adhesive layer.
  • a 50 ⁇ m thick polyethylene terephthalate film is bonded to the exposed surface of the adhesive tape.
  • the other release polyethylene terephthalate film of the adhesive tape is peeled off, the adhesive layer is exposed, and the exposed surface of the adhesive tape is placed on a polycarbonate plate or an acrylic plate with a 2.0 kg rubber roller at a speed of 300 mm / min.
  • the polycarbonate plate or the acrylic plate and the adhesive tape are bonded together and left at 23 ° C. for 24 hours to prepare a test sample.
  • the obtained test sample is subjected to a tensile test in the 180 ° direction at a peeling rate of 0.3 mm / min, and the obtained value is 180 ° peeling force (N / 25 mm) against a polycarbonate plate or an acrylic plate at a peeling rate of 0.3 mm / min. ).
  • the pressure-sensitive adhesive tape of the present invention may be a non-support type having no base material, or may be a support type in which a pressure-sensitive adhesive layer is formed on both surfaces of the base material.
  • the base material is not particularly limited as long as it is a transparent base material.
  • acrylic resin, polyolefin, polycarbonate, polyvinyl chloride, acrylonitrile butadiene styrene (ABS) resin, polyethylene terephthalate (PET), nylon examples thereof include a sheet made of a transparent resin such as polyurethane and polyimide, a sheet having a network structure, and a sheet having holes.
  • the thickness of the substrate is not particularly limited, but is preferably 2 to 200 ⁇ m. If the thickness of the substrate is less than 2 ⁇ m, the strength of the resulting adhesive tape may be insufficient, and it may be torn or difficult to handle. When the thickness of the base material exceeds 200 ⁇ m, the base material is too strong, and the followability to the level difference of the obtained adhesive tape may be deteriorated.
  • the thickness of the substrate is more preferably 5 to 100 ⁇ m.
  • the pressure-sensitive adhesive tape of the present invention may have a release paper or a release film laminated on the pressure-sensitive adhesive layer.
  • the release paper or release film is not particularly limited.
  • a release film obtained by subjecting a synthetic resin film made of polyester resin, polyethylene resin, polypropylene resin, polyvinyl chloride, nylon or the like to release treatment.
  • Examples include release paper obtained by forming a release layer on base paper having high surface smoothness such as high-quality paper and glassine paper.
  • the thickness of the release paper or release film is not particularly limited, but is preferably 12 to 125 ⁇ m. When the thickness is out of the above range, the cutting processability of the adhesive tape may be deteriorated.
  • the thickness of the release paper or release film is more preferably 20 to 100 ⁇ m.
  • the center line average roughness (Ra) of the release paper or release film is not particularly limited, but is preferably 0.2 ⁇ m or less.
  • the method for producing the pressure-sensitive adhesive tape of the present invention is not particularly limited.
  • the pressure-sensitive adhesive composition is applied to a release-treated surface of a release paper or a release film. Then, a pressure-sensitive adhesive layer is formed, and a newly prepared release paper or release film is laminated on the obtained pressure-sensitive adhesive layer so that the release treatment surface faces the pressure-sensitive adhesive layer.
  • a method of pressing the obtained laminated body with a rubber roller or the like after the body is obtained may be mentioned.
  • the use of the adhesive tape of the present invention is not particularly limited, but when manufacturing an image display device such as a mobile phone or a portable information terminal, a protective plate for protecting the surface made of a polycarbonate plate or an acrylic plate is used as a display panel or It can be used for bonding to the surface of an image display device such as a touch panel (see FIG. 5). Further, the display panel or the touch panel can be used for bonding to the surface of a support made of a polycarbonate plate or an acrylic plate.
  • the pressure-sensitive adhesive tape of the present invention has high transparency and can be suitably applied to optical applications that require high transparency such as bonding to a display panel or a touch panel.
  • the polycarbonate plate and the acrylic plate easily absorb moisture, the outgas generated under the high temperature condition is likely to cause floating at the interface with the pressure-sensitive adhesive layer, but by using the pressure-sensitive adhesive tape of the present invention. Such floating off can be effectively suppressed.
  • a laminate formed by attaching a polycarbonate plate or an acrylic plate to a transparent electrode via the adhesive tape of the present invention is also one aspect of the present invention.
  • the polycarbonate plate or the acrylic plate is not particularly limited.
  • the polycarbonate plate or the acrylic plate used for an image display device or the like is preferable, and the polycarbonate plate used as a protective plate for protecting the surface of the image display device or the like.
  • the transparent electrode include an ITO electrode.
  • the laminate of the present invention is not particularly limited as long as the polycarbonate plate or the acrylic plate is attached to the transparent electrode via the adhesive tape of the present invention, and examples thereof include a laminate used for an image display device and the like.
  • An image display device having the laminate of the present invention is also one aspect of the present invention.
  • Examples of the image display device of the present invention include touch panels such as a resistive touch panel and a capacitive touch panel.
  • the resistive film type touch panel includes, for example, a support having a protective plate made of a polycarbonate plate or an acrylic plate, an upper transparent electrode, a spacer, and a lower transparent electrode in this order.
  • An example of such a resistive film type touch panel is shown in FIG.
  • the protective plate 1 made of a polycarbonate plate or an acrylic plate and the upper transparent electrode 3 are bonded together with the adhesive tape 2 of the present invention.
  • the support body 7 and the lower transparent electrode 5 are bonded together through the adhesive tape 6 of this invention.
  • the support 7 and the lower transparent electrode 5 may be bonded together by the adhesive tape of the present invention or may be bonded by an adhesive tape other than the adhesive tape of the present invention. Moreover, the support body 7 and the lower transparent electrode 5 may be laminated
  • the adhesive tape of the present invention is a double-sided adhesive tape.
  • the capacitive touch panel includes, for example, a protective plate made of a polycarbonate plate or an acrylic plate, a glass plate with ITO films formed on the front and back sides, and a support.
  • a protective plate 8 made of a polycarbonate plate or an acrylic plate, and a glass plate 11 having ITO films 10 and 12 formed on the front and back sides, with the adhesive tape 9 of the present invention. are pasted together.
  • membrane was formed in the front and back are bonded together through the adhesive tape 13 of this invention.
  • the support 14 and the glass plate on which the ITO film is formed on the front and back may be bonded together by the adhesive tape of the present invention or may be bonded by an adhesive tape other than the adhesive tape of the present invention. Moreover, the support body 14 and the glass plate by which the ITO film
  • the adhesive tape of the present invention is a double-sided adhesive tape.
  • an adhesive tape that has high transparency, is excellent in adhesion to a polycarbonate plate and an acrylic plate, and can suppress floating peeling occurring at the interface with the polycarbonate plate or the acrylic plate even under high temperature conditions. be able to.
  • the laminated body and image display apparatus which are manufactured using this adhesive tape can be provided.
  • FIG. 1 is a photograph of a test sample produced using the double-sided pressure-sensitive adhesive tape obtained in Example 1 in the evaluation of the bubble generation state.
  • FIG. 2 is a photograph of a test sample produced using the double-sided pressure-sensitive adhesive tape obtained in Comparative Example 1 in the evaluation of the bubble generation state.
  • 3A and 3B are a cross-sectional view and a perspective view schematically showing an example in which a protective plate made of a polycarbonate plate or an acrylic plate is attached to a transparent electrode via the adhesive tape of the present invention.
  • 4 (a) and 4 (b) are a cross-sectional view and a perspective view schematically showing an example when a protective plate made of a polycarbonate plate or an acrylic plate is attached to a transparent electrode via the adhesive tape of the present invention.
  • FIG. 5 is a cross-sectional view schematically showing an example in which a protective plate is attached to the surface of an image display device using the adhesive tape of the present invention.
  • Example 1 Production of double-sided pressure-sensitive adhesive tape
  • a reactor equipped with a thermometer, stirrer, and cooling tube 89.3 parts by weight of 2-ethylhexyl acrylate, 10 parts by weight of isobornyl acrylate, and 0.5 parts by weight of acrylic acid
  • 0.2 parts by weight of 2-hydroxyethyl acrylate and 100 parts by weight of ethyl acetate with respect to 100 parts by weight of these monomers were added and purged with nitrogen, and then the reactor was heated to start refluxing.
  • t-hexylperoxypivalate as a polymerization initiator is diluted with 5 parts by weight of ethyl acetate with respect to 100 parts by weight of the monomer, and the resulting polymerization initiator solution is diluted with the above reactor.
  • the solution was added dropwise over 2 hours. Thereafter, the mixture was refluxed at 70 ° C. for 8 hours from the start of addition of the polymerization initiator to obtain an acrylic copolymer solution having a solid content of 50%.
  • the proportion (% by weight) of structural units derived from the respective monomers constituting the acrylic copolymer was measured.
  • Table 1 shows the proportion (% by weight) of the obtained structural units.
  • the weight average molecular weight by polystyrene conversion measured by GPC method using "2690 Separations Model" made from Waters as a column was about 500,000.
  • a pressure-sensitive adhesive composition To 100 parts by weight of the obtained acrylic copolymer, 0.5 part by weight of Coronate HX (manufactured by Nippon Polyurethane Co., Ltd.) was added as a crosslinking agent and stirred to obtain a pressure-sensitive adhesive composition.
  • the obtained pressure-sensitive adhesive composition is coated on the release-treated surface of the release polyethylene terephthalate film to form a pressure-sensitive adhesive layer.
  • the release-treated surface becomes the pressure-sensitive adhesive layer.
  • a newly prepared release polyethylene terephthalate film was laminated so as to face each other to obtain a laminate. By pressing the obtained laminate with a rubber roller, a double-sided pressure-sensitive adhesive tape having a release polyethylene terephthalate film attached on both sides was obtained.
  • the double-sided adhesive tape was cut so as to have a planar shape of 25 mm x 100 mm.
  • One release polyethylene terephthalate film of the cut double-sided pressure-sensitive adhesive tape was peeled off to expose the pressure-sensitive adhesive layer.
  • the exposed surface of the double-sided pressure-sensitive adhesive tape was bonded onto the polyethylene terephthalate film.
  • the other release polyethylene terephthalate film of the double-sided pressure-sensitive adhesive tape is peeled off, the pressure-sensitive adhesive layer is exposed, and the exposed surface of the double-sided pressure-sensitive adhesive tape is bonded onto the polycarbonate plate (PC plate).
  • PC plate polycarbonate plate
  • a laminated sample in which a double-sided pressure-sensitive adhesive tape and a polyethylene terephthalate film were laminated in this order on the plate) was obtained. Then, a polycarbonate plate (PC plate) and a double-sided adhesive tape are bonded together by placing a 2.0 kg rubber roller on the obtained polyethylene terephthalate film of the laminated sample and reciprocating the rubber roller at a speed of 300 mm / min. The sample was left at 23 ° C. for 20 minutes to prepare a test sample. Moreover, the test sample was similarly prepared using the acrylic board instead of the said polycarbonate board (PC board) board. The obtained test sample was subjected to a tensile test in the 180 ° direction at a peeling speed of 300 mm / min according to JIS Z0237, and the adhesive strength (N / 25 mm) was measured.
  • PC plate polycarbonate plate
  • a double-sided adhesive tape are bonded together by placing a 2.0 kg rubber roller on the obtained polyethylene terephthalate film of the
  • Bubble generation state (foam resistance test)
  • the double-sided adhesive tape was cut so as to have a planar shape of 45 mm ⁇ 60 mm.
  • One release polyethylene terephthalate film of the cut double-sided pressure-sensitive adhesive tape was peeled off to expose the pressure-sensitive adhesive layer.
  • the exposed surface of the double-sided pressure-sensitive adhesive tape was bonded onto a polyethylene terephthalate film having a thickness of 0.5 mm.
  • the other release polyethylene terephthalate film of the double-sided pressure-sensitive adhesive tape is peeled off, the pressure-sensitive adhesive layer is exposed, and the surface of the double-sided pressure-sensitive adhesive tape exposed on a polycarbonate plate (PC board) having a planar shape with a thickness of 2.0 mm
  • PC board polycarbonate plate having a planar shape with a thickness of 2.0 mm
  • FIG. 1 shows a photograph of the test sample of Example 1 in which no bubbles having a size of 0.01 mm or more were observed, and FIG. 2 shows six bubbles having a size of 0.01 mm or more.
  • the photograph of the test sample of the comparative example 1 is shown.
  • Examples 2 to 15 and Comparative Examples 1 to 6 Double-sided pressure-sensitive adhesive tape in the same manner as in Example 1 except that the acrylic copolymer having the proportion (% by weight) of the structural units shown in Table 1 or 2 was obtained by changing the monomer composition of the acrylic copolymer. And each measurement was performed.
  • the double-sided pressure-sensitive adhesive tape was cut so as to have a planar shape of 25 mm ⁇ 100 mm.
  • One release polyethylene terephthalate film of the cut double-sided pressure-sensitive adhesive tape was peeled off to expose the pressure-sensitive adhesive layer.
  • a polyethylene terephthalate film having a thickness of 50 ⁇ m was bonded to the exposed surface of the double-sided pressure-sensitive adhesive tape.
  • the other release polyethylene terephthalate film of the double-sided pressure-sensitive adhesive tape is peeled off, the pressure-sensitive adhesive layer is exposed, and the exposed surface of the pressure-sensitive adhesive tape is placed on a polycarbonate plate or acrylic plate with a 2.0 kg rubber roller at a speed of 300 mm / min.
  • the polycarbonate plate or the acrylic plate and the double-sided pressure-sensitive adhesive tape were bonded to each other by being reciprocated once at 24 ° C. for 24 hours to prepare a test sample.
  • the obtained test sample was subjected to a tensile test in the 180 ° direction at a peeling rate of 0.3 mm / min, and the 180 ° peeling force (N / 25 mm) against a polycarbonate plate or an acrylic plate at a peeling rate of 0.3 mm / min was measured. .
  • a double-sided pressure-sensitive adhesive tape having a thickness of 1 mm was obtained by laminating double-sided pressure-sensitive adhesive tapes.
  • the obtained double-sided pressure-sensitive adhesive tape was subjected to shear storage modulus (G ′) at 20 ° C. and 85 ° C. using a dynamic viscoelasticity measuring device (DVA-200, manufactured by IT Measurement Control Co., Ltd.) at a frequency of 10 Hz and a temperature rising rate of 5 ° C. Measured at / min. Further, the shear loss elastic modulus (G ′′) and the shear storage elastic modulus (G ′) at ⁇ 25 to 25 ° C.
  • DVA-200 dynamic viscoelasticity measuring device
  • Bubble generation state (foam resistance test)
  • the double-sided adhesive tape was cut so as to have a planar shape of 45 mm ⁇ 60 mm.
  • One release polyethylene terephthalate film of the cut double-sided pressure-sensitive adhesive tape was peeled off to expose the pressure-sensitive adhesive layer.
  • a polyethylene terephthalate film having a thickness of 0.5 mm was bonded to the exposed surface of the double-sided pressure-sensitive adhesive tape.
  • the other release polyethylene terephthalate film of the double-sided pressure-sensitive adhesive tape is peeled off to expose the pressure-sensitive adhesive layer, and the surface of the pressure-sensitive adhesive tape exposed on a polycarbonate plate or acrylic plate having a thickness of 2.0 mm is 2
  • a 0.0 kg rubber roller is reciprocated once at a speed of 300 mm / min to bond a polycarbonate plate or an acrylic plate and a double-sided adhesive tape, and are treated in an autoclave at 60 ° C. and 0.5 MPa for 20 minutes. Prepared.
  • the obtained test sample was allowed to stand for 500 hours under conditions of a temperature of 85 ° C. or a temperature of 60 ° C.
  • an adhesive tape that has high transparency, is excellent in adhesion to a polycarbonate plate and an acrylic plate, and can suppress floating peeling occurring at the interface with the polycarbonate plate or the acrylic plate even under high temperature conditions. be able to.
  • the laminated body and image display apparatus which are manufactured using this adhesive tape can be provided.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Adhesive Tapes (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Laminated Bodies (AREA)

Abstract

L'invention porte sur un ruban adhésif sensible à la pression qui est hautement transparent et présente une excellente force adhésive en application sur une plaque de polycarbonate et une plaque acrylique et avec lequel il est possible d'empêcher un soulèvement ou un pelage de se produire à l'interface entre la plaque de polycarbonate ou la plaque acrylique et la couche adhésive même dans des conditions de haute température. L'invention porte également sur un stratifié et sur un dispositif d'affichage d'image tous deux obtenus à l'aide du ruban adhésif sensible à la pression. Le ruban adhésif sensible à la pression a une couche adhésive sensible à la pression comprenant une composition adhésive sensible à la pression contenant un copolymère, le copolymère comprenant une unité structurale issue d'un monomère ayant une structure bicyclo et une double liaison oléfinique dans la molécule et une unité structurale issue d'un ester (méth)acrylique monomère ayant une structure représentée par la formule générale (1), la proportion de l'unité structurale issue d'un monomère ayant une structure bicyclo et une double liaison oléfinique dans la molécule dans 100 parties en poids du copolymère étant de 10-60 parties en poids, et la proportion de l'unité structurale issue d'un ester (méth)acrylique monomère ayant une structure représentée par la formule générale (1) dans 100 parties en poids du copolymère étant de 30-90 % en poids. Le ruban adhésif sensible à la pression a une transmittance lumineuse totale dans la région des longueurs d'onde de la lumière visible de 90 % ou plus et un trouble de 1 % ou moins. Dans la formule générale (1), R1 représente un atome d'hydrogène ou méthyle, et R2 représente un alkyle en C3-14, dans lequel un ou plusieurs des atomes d'hydrogène peuvent avoir été remplacés par un cycloalkyle.
PCT/JP2010/062048 2009-07-16 2010-07-16 Ruban adhésif sensible à la pression, stratifié et dispositif d'affichage d'image WO2011007861A1 (fr)

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KR1020127003971A KR101800470B1 (ko) 2009-07-16 2010-07-16 점착 테이프, 적층체 및 화상 표시 장치
CN201080031369.9A CN102471657B (zh) 2009-07-16 2010-07-16 粘合胶带、层叠体及图像显示装置
JP2010530197A JPWO2011007861A1 (ja) 2009-07-16 2010-07-16 粘着テープ、積層体及び画像表示装置

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WO2013176364A1 (fr) * 2012-05-24 2013-11-28 (주)엘지하우시스 Composition adhésive ayant une flexibilité élevée
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WO2015098727A1 (fr) * 2013-12-27 2015-07-02 積水化学工業株式会社 Adhésif optique, bande adhésive optique et corps stratifié
JP2017008327A (ja) * 2016-08-18 2017-01-12 積水化学工業株式会社 （メタ）アクリル系粘着剤
JP2017082094A (ja) * 2015-10-28 2017-05-18 積水化学工業株式会社 半導体加工用両面粘着テープ
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JP6456717B2 (ja) * 2014-03-31 2019-01-23 マクセルホールディングス株式会社 粘着テープ
JP6341889B2 (ja) * 2015-07-06 2018-06-13 綜研化学株式会社 遮光性両面粘着部材用のアクリル系粘着剤組成物、遮光性両面粘着部材および画像表示装置
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TW201728452A (zh) * 2015-10-30 2017-08-16 可樂麗股份有限公司 射出成形複合物及裝飾片、以及此等之製造方法
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