CN104277745A - Pressure-sensitive adhesive tape, laminate, and image display device - Google Patents

Pressure-sensitive adhesive tape, laminate, and image display device Download PDF

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Publication number
CN104277745A
CN104277745A CN201410493533.8A CN201410493533A CN104277745A CN 104277745 A CN104277745 A CN 104277745A CN 201410493533 A CN201410493533 A CN 201410493533A CN 104277745 A CN104277745 A CN 104277745A
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China
Prior art keywords
adhesive tape
monomer
mentioned
methyl
linking agent
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永井康晴
丸尾耕平
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Sekisui Chemical Co Ltd
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Sekisui Chemical Co Ltd
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Publication of CN104277745A publication Critical patent/CN104277745A/en
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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
    • 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
    • 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
    • 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

Abstract

Provided is a pressure-sensitive adhesive tape which is highly transparent and has excellent adhesive force in application to a polycarbonate plate and an acrylic plate and with which it is possible to inhibit lifting or peeling from occurring at the interface between the polycarbonate plate or acrylic plate and the adhesive layer even under high-temperature conditions. Also provided are a laminate and an image display device both produced using the pressure-sensitive adhesive tape. The pressure-sensitive adhesive tape has a pressure-sensitive adhesive layer comprising a pressure-sensitive adhesive composition containing a copolymer, wherein the copolymer comprises a structural unit derived from a monomer having a bicyclo structure and one olefinic double bond in the molecule and a structural unit derived from a (meth)acrylic ester monomer having a structure represented by general formula (1), the proportion of the structural unit derived from a monomer having a bicyclo structure and one olefinic double bond in the molecule in 100 parts by weight the copolymer being 10-60 parts by weight and the proportion of the structural unit derived from a (meth)acrylic ester monomer having a structure represented by general formula (1) in 100 parts by weight of the copolymer being 30-90 parts by weight. The pressure-sensitive adhesive tape has a total light transmittance in the visible-light wavelength region of 90% or higher and a haze of 1% or lower. In general formula (1), R1 represents a hydrogen atom or methyl, and R2 represents a C3-14 alkyl, in which one or more of the hydrogen atoms may have been replaced with a cycloalkyl.

Description

Adhesive tape, duplexer and image display device
The application is the divisional application of 201080031369.9 (international application no: PCT/JP2010/062048), and the applying date of original application is on July 16th, 2010, and the denomination of invention of original application is adhesive tape, duplexer and image display device
Technical field
The present invention relates to a kind of adhesive tape, its transparency is high, outstanding with the bounding force of polycarbonate plate and acrylic panel, though also can suppress under the high temperature conditions with the interface of polycarbonate plate or acrylic panel in produce heave stripping.In addition, the invention still further relates to the duplexer using this adhesive tape to manufacture and image display device.
Background technology
In recent years, display pannel or touch panel are used in the image display device in the image display device such as portable phone, mobile information terminal or various field.In this kind of image display device, such as, press from both sides across transparent binder layer, fit for the protection of the protecting sheet on surface and display pannel or touch panel, in this kind of protecting sheet, generally use polycarbonate plate, acrylic panel etc. recently.
But known polycarbonate plate and acrylic panel easily absorb moisture, moisture generating gasification under the high temperature conditions, produces Exhaust Gas.The problem caused thus is, under the high temperature conditions, produces and heaves stripping, thus produce bad order because of the reason of Exhaust Gas in the interface of polycarbonate plate or acrylic panel and binder layer.Such as, in order to prevent, by heaving the bad order peeled off and cause, suitably adjusting the operation of the molecular weight of the acrylic acid polymer forming binder layer, but in this kind of method, very difficult acquisition can suppress to heave release adhesive oxidant layer fully.
In addition, such as in patent documentation 1, record following transparent double face adhesive tape or thin slice, double-sided adhesive tape or the thin slice with the transparency, be formed with transparent adhesive layer on the two sides of transparent substrate, and the transparent adhesive layer being formed at least one face of transparent substrate is formed by the binder composition containing specific acrylic acid polymer (a) and oligopolymer (b).In patent documentation 1, aforesaid propylene acid based polymer (a) is that (methyl) alkyl acrylate of 4 ~ 12 is as monomer principal constituent using the carbon number of alkyl, and contain the monomer containing carboxyl of 3 ~ 10 weight parts as monomer component relative to whole monomer component 100 weight part, in addition, to be weight-average molecular weight be 500,000 ~ 900,000 acrylic acid polymer, in addition, above-mentioned oligopolymer (b) using second-order transition temperature when forming homopolymer be 60 ~ 190 DEG C and the ethylenically unsaturated monomers with ring texture as monomer principal constituent, and contain the monomer containing carboxyl of 3 ~ 10 weight parts as monomer component relative to whole monomer component 100 weight part, in addition, to be weight-average molecular weight be 3000 ~ 6000 oligopolymer.
Record in patent documentation 1, the transparent double face adhesive tape recorded in same document or thin slice heave peel off in preventive outstanding, in addition, also very outstanding in the transparency and warpage preventing.But, in patent documentation 1 record transparent double face adhesive tape or thin slice due to by 2 kinds of polymkeric substance or oligopolymer used in combination, therefore because the intermiscibility of 2 kinds of polymkeric substance or oligopolymer not fully exists muddy problem, very difficult realization is enough to the high transparent being applicable to optical applications.
[patent documentation]
[patent documentation 1] Japanese Unexamined Patent Publication 2005-255877 publication
Summary of the invention
The object of the invention is to, provide a kind of adhesive tape, its transparency is high, outstanding with the bounding force of polycarbonate plate and acrylic panel, though also can suppress under the high temperature conditions with the interface of polycarbonate plate or acrylic panel in produce heave stripping.In addition, the present invention also aims to, the duplexer and image display device that use this adhesive tape to manufacture are provided.
The invention provides a kind of adhesive tape, it is characterized in that, it has the binder layer be made up of the binder composition containing multipolymer,
Described multipolymer has the structural unit that derives from the monomer in molecule with twin nuclei and 1 alkene double bond and derives from the structural unit of (methyl) acrylate monomer with the structure represented with following general formula (1),
The described ratio of structural unit shared by described copolymer 1 00 weight part deriving from the monomer in molecule with twin nuclei and 1 alkene double bond is 10 ~ 60 weight parts,
The ratio shared in described copolymer 1 00 weight part of the described structural unit deriving from (methyl) acrylate monomer with the structure represented with general formula (1) is 30 ~ 90 weight parts,
Total light penetration in visible wavelength region is more than 90%, and turbidity value is less than 1%,
[changing 1]
In general formula (1), R 1represent hydrogen atom or methyl, R 2represent that carbon number is the alkyl of 3 ~ 14.R 2the hydrogen atom of alkyl also can by cycloalkyl substituted.
Below, the present invention is described in detail.
Under the high temperature conditions, heave stripping for what produce in the interface of polycarbonate plate or acrylic panel and binder layer, can think to be caused by following situation, namely, from this polycarbonate plate or acrylic panel, produce Exhaust Gas, make air bubble growth because of this gaseous tension.Thus, in order to suppress to heave stripping, following way can be considered, that is, by improving binder layer relative to the adaptation of polycarbonate plate and acrylic panel or bounding force, hinder the growth with the bubble in the interface of polycarbonate plate or acrylic panel.
The discoveries such as the present inventor, by using the binder composition containing multipolymer, this multipolymer has the structural unit deriving from the monomer in molecule with twin nuclei and 1 alkene double bond and the structural unit deriving from (methyl) acrylate monomer with specific structure, just can form the binder layer significantly improved with the bounding force of polycarbonate plate and acrylic panel.The discoveries such as the present inventor, there is binder layer that this kind be made up of binder composition and to have the adhesive tape transparency of total light penetration of given range and turbidity value high, even if also can suppress under the high temperature conditions with the interface of polycarbonate plate or acrylic panel in produce heave stripping, thus complete the present invention.And so-called (methyl) vinylformic acid, refers to vinylformic acid or methacrylic acid.
Adhesive tape of the present invention has the binder layer be made up of the binder composition containing multipolymer.
Above-mentioned multipolymer has the structural unit deriving from the monomer in molecule with twin nuclei and 1 alkene double bond.By making above-mentioned multipolymer have the above-mentioned structural unit deriving from the monomer in molecule with twin nuclei and 1 alkene double bond, adhesive tape of the present invention will increase substantially for the bounding force of polycarbonate plate and acrylic panel.
Above-mentioned twin nuclei is not particularly limited, and as the above-mentioned functional group with twin nuclei, such as, can enumerate dicyclo [1.1.0] butyl, dicyclo [1.1.1] amyl group, dicyclo [2.1.0] amyl group, dicyclo [3.1.0] hexyl, dicyclo [2.1.1] hexyl, dicyclo [2.2.0] hexyl, dicyclo [2.2.1] heptyl, dicyclo [3.1.1] heptyl, dicyclo [3.2.0] heptyl, dicyclo [4.1.0] heptyl, dicyclo [2.2.2] octyl group, dicyclo [3.2.1] octyl group, dicyclo [3.3.0] octyl group, dicyclo [4.1.1] octyl group, dicyclo [4.2.0] octyl group, dicyclo [5.1.0] octyl group, dicyclo [3.2.2] nonyl, dicyclo [3.3.1] nonyl, dicyclo [4.2.1] nonyl, dicyclo [4.3.0] nonyl, dicyclo [5.1.1] nonyl, dicyclo [5.2.0] nonyl, dicyclo [6.1.0] nonyl, dicyclo [4.3.1] decyl, and there is the functional group etc. of the structure that the part chain-like alkyl of hydrogen atom of the functional group these with twin nuclei or cyclic alkyl instead of.And above-mentioned replacement both can be 1 place, also can be many places.In the middle of the functional group that these have twin nuclei, preferred norcamphyl, isobornyl, particularly preferably isobornyl.
In addition, above-mentioned alkene double bond is not particularly limited, and as the functional group with above-mentioned alkene double bond, such as, can enumerate (methyl) acryl, vinyl, allyl group etc.In the middle of the functional group that these have alkene double bond, preferably (methyl) acryl.And so-called (methyl) acryl, refers to acryl or methacryloyl.
The above-mentioned monomer in molecule with twin nuclei and 1 alkene double bond is not particularly limited, but more preferably has (methyl) isobornyl acrylate of isobornyl and (methyl) acryl.And so-called (methyl) acrylate, refers to acrylate or methacrylic ester.
The above-mentioned ratio deriving from the structural unit of the monomer in molecule with twin nuclei and 1 alkene double bond shared in above-mentioned copolymer 1 00 weight part is 10 ~ 60 weight parts.The ratio deriving from the structural unit of the monomer in molecule with twin nuclei and 1 alkene double bond if above-mentioned is less than 10 weight parts, then the adhesive tape of gained will reduce for the bounding force of polycarbonate plate and acrylic panel, under the high temperature conditions, cannot hinder fully in the growth with the bubble in the interface of polycarbonate plate or acrylic panel.The ratio of the structural unit of the monomer in molecule with twin nuclei and 1 alkene double bond is derived from more than 60 weight parts if above-mentioned, then the second-order transition temperature of the multipolymer of gained raises, the adhesive tape using this multipolymer to manufacture reduces for the adaptation of polycarbonate plate and acrylic panel, under the high temperature conditions, cannot hinder fully in the growth with the bubble in the interface of polycarbonate plate or acrylic panel.
The above-mentioned ratio deriving from the structural unit of the monomer in molecule with twin nuclei and 1 alkene double bond shared in above-mentioned copolymer 1 00 weight part is preferably 15 ~ 55 weight parts, is more preferably 20 ~ 50 weight parts.
Above-mentioned multipolymer has the structural unit deriving from (methyl) acrylate monomer with the structure represented with following general formula (1).
[changing 2]
In general formula (1), R 1represent hydrogen atom or methyl, R 2represent that carbon number is the alkyl of 3 ~ 14.R 2the hydrogen atom of alkyl also can by cycloalkyl substituted.
If above-mentioned R 2the carbon number of alkyl be less than 2 or more than 15, then the second-order transition temperature of the multipolymer of gained raises, the wetting property at the initial stage of the binder layer of the adhesive tape using this multipolymer to manufacture reduces, adaptation for polycarbonate plate and acrylic panel reduces, under the high temperature conditions, cannot hinder fully in the growth with the bubble in the interface of polycarbonate plate or acrylic panel.Above-mentioned R 2the carbon number of alkyl be preferably 4 ~ 12.
In addition, above-mentioned R 2the hydrogen atom of alkyl also can by cycloalkyl substituted.Above-mentioned cycloalkyl is not particularly limited, such as, can enumerate cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, suberyl, ring octyl group etc.
(methyl) acrylate monomer with the structure represented with above-mentioned general formula (1) is not particularly limited, such as can enumerate (methyl) butyl acrylate, (methyl) 2-EHA, (methyl) Octyl acrylate, (methyl) propyl acrylate, (methyl) vinylformic acid 2-ethyl monooctyl ester, (methyl) vinylformic acid ester in the ninth of the ten Heavenly Stems, (methyl) vinylformic acid ester in the different ninth of the ten Heavenly Stems, (methyl) decyl acrylate, (methyl) isodecyl acrylate, (methyl) lauryl acrylate, the different tetradecyl ester of (methyl) vinylformic acid etc.Derive from the structural unit of this kind of monomer by making above-mentioned multipolymer have, the adhesive tape of gained not only can improve for the bounding force of polycarbonate plate and acrylic panel, and the cohesive force of binder layer, initial bond, adaptation etc. also can improve.
Especially, from the viewpoint of low temperature elasticity modulus is low, the wetting property at initial stage is high binder layer can be obtained, there is (methyl) acrylate monomer of the structure represented with above-mentioned general formula (1) preferably containing at least a kind of (methyl) acrylate monomer be selected from (methyl) 2-EHA, (methyl) Octyl acrylate and (methyl) butyl acrylate.
In above-mentioned copolymer 1 00 weight part, shared deriving from has the ratio of the structural unit of (methyl) acrylate monomer of the structure represented with above-mentioned general formula (1) is 30 ~ 90 weight parts.If the ratio deriving from the structural unit of (methyl) acrylate monomer with the structure represented with above-mentioned general formula (1) is less than 30 weight parts, then the low temperature elasticity modulus of the binder layer of the adhesive tape of gained uprises, the wetting property at initial stage reduces, adaptation for polycarbonate plate and acrylic panel reduces, under the high temperature conditions, cannot hinder fully in the growth with the bubble in the interface of polycarbonate plate or acrylic panel.If derive from the ratio of the structural unit of (methyl) acrylate monomer with the structure represented with above-mentioned general formula (1) more than 90 weight parts, then the cohesive force of the binder layer of the adhesive tape of gained reduces and processibility is reduced, in addition, because the ratio deriving from the structural unit of the monomer in molecule with twin nuclei and 1 alkene double bond above-mentioned in above-mentioned multipolymer relatively reduces, the adhesive tape of gained will reduce for the bounding force of polycarbonate plate and acrylic panel.
In above-mentioned copolymer 1 00 weight part, the shared ratio with (methyl) acrylate monomer of the structure represented with above-mentioned general formula (1) is preferably 50 ~ 85 weight parts.
Above-mentioned multipolymer still can have the structural unit of the monomer deriving from other.
By making above-mentioned multipolymer have the above-mentioned structural unit deriving from other monomer, the molecular interaction of the multipolymer of gained will increase, and the cohesive force of the binder layer of the adhesive tape using this multipolymer to manufacture improves.In addition, when other monomer above-mentioned has polar group, because the surface of this polar group and polycarbonate plate or acrylic panel interacts, and the interface cohesive force of the binder layer of the adhesive tape of gained is improved.
Other monomer above-mentioned is not particularly limited, but in molecule, preferably have the monomer being selected from least 1 polar group in carboxyl, hydroxyl, amide group, amino, epoxy group(ing), aldehyde radical and isocyanate group and 1 alkene double bond.In the middle of these other monomer, from the viewpoint of the cohesive force of binder layer of adhesive tape improving gained, more preferably there is the monomer of carboxyl and 1 alkene double bond in molecule, there is the monomer of hydroxyl and 1 alkene double bond in molecule.
The above-mentioned monomer in molecule with carboxyl and 1 alkene double bond is not particularly limited, such as, can enumerate the unsaturated dicarboxylic acids etc. such as unsaturated monocarboxylic, toxilic acid, fumaric acid, citraconic acid, methylfumaric acid, methylene-succinic acid such as (methyl) vinylformic acid, (methyl) acryl acetic acid, (methyl) acryl propionic acid, (methyl) acryl butyric acid, (methyl) acryl valeric acid, β-crotonic acid.
When above-mentioned multipolymer have above-mentioned derive from the structural unit of the monomer in molecule with carboxyl and 1 alkene double bond, the above-mentioned ratio deriving from the structural unit of the monomer in molecule with carboxyl and 1 alkene double bond shared in above-mentioned copolymer 1 00 weight part is preferably below 2 weight parts.Derive from the ratio of the structural unit of the monomer in molecule with carboxyl and 1 alkene double bond if above-mentioned more than 2 weight parts, then the binder layer of the adhesive tape of gained is using the metallic film containing metal or metal oxide such as ITO as having the situation easily making this metallic film deterioration during bonded body.The above-mentioned ratio deriving from the constituent of the monomer in molecule with carboxyl and 1 alkene double bond shared in above-mentioned copolymer 1 00 weight part is more preferably below 1 weight part, more preferably below 0.5 weight part.
In addition, above-mentioned multipolymer also can not have the above-mentioned structural unit deriving from the monomer in molecule with carboxyl and 1 alkene double bond.
And in general, the sour composition in multipolymer contained in binder layer, when using the metallic film containing metal or metal oxide such as ITO as bonded body, can become the reason of the deterioration causing this metallic film.On the other hand, when multipolymer containing such as above-mentioned derive from the sour compositions such as the structural unit of the monomer in molecule with carboxyl and 1 alkene double bond, even if be not easy to obtain the also high binder layer of the high reliability under the high temperature conditions of cohesive force.
Different with it, in adhesive tape of the present invention, because of above-mentioned multipolymer have above-mentioned derive from the monomer in molecule with twin nuclei and 1 alkene double bond structural unit and the above-mentioned structural unit deriving from (methyl) acrylate monomer with the structure represented with general formula (1), even if when above-mentioned multipolymer is not containing sour composition, binder layer also can be excellent in bounding force, cohesive force, initial bond, adaptation etc., even if reliability is also high under the high temperature conditions.So, even if adhesive tape of the present invention also can maintain high reliability under the high temperature conditions, and ITO etc. can be suppressed to contain the deterioration of the metallic film of metal or metal oxide.
The above-mentioned monomer in molecule with hydroxyl and 1 alkene double bond is not particularly limited, such as, can enumerate (methyl) vinylformic acid 2-hydroxy methacrylate, (methyl) vinylformic acid 3-hydroxy propyl ester, (methyl) vinylformic acid 4-hydroxybutyl etc.
When above-mentioned multipolymer have above-mentioned derive from the structural unit of other monomer, the above-mentioned ratio deriving from the structural unit of other monomer shared in above-mentioned copolymer 1 00 weight part is not particularly limited, but is preferably below 20 weight parts.The ratio of the structural unit of other monomer is derived from more than 20 weight parts if above-mentioned, then the wetting property at the initial stage of the binder layer of the adhesive tape of gained will reduce, adaptation for polycarbonate plate and acrylic panel reduces, under the high temperature conditions, the situation that cannot hinder fully in the growth with the bubble in the interface of polycarbonate plate or acrylic panel is had.The above-mentioned ratio deriving from the structural unit of other monomer shared in above-mentioned copolymer 1 00 weight part is more preferably below 15 weight parts.
The method manufacturing above-mentioned multipolymer is not particularly limited, such as, can enumerate the method etc. that the monomer making to have twin nuclei and a 1 alkene double bond containing above-mentioned in molecule, above-mentioned (methyl) acrylate monomer with the structure represented with general formula (1) and other the monomer mixture of monomer above-mentioned coordinated as required carry out radical polymerization under the existence of coincidence initiator.
Above-mentioned polymerization process is not particularly limited, such as, can use the known polymerization processs such as solution polymerization, letex polymerization, suspension polymerization, mass polymerization.
Solvent used in above-mentioned solution polymerization is not particularly limited, such as, can enumerate ethyl acetate, toluene, methyl-sulphoxide, ethanol, acetone, diethyl ether etc.
The use level of solvent used in above-mentioned solution polymerization is not particularly limited, but is 25 weight parts relative to the preferred lower limit of above-mentioned monomer mixture 100 weight part, and the preferred upper limit is 300 weight parts.If the use level of above-mentioned solvent is less than 25 weight parts, then the molecular weight distribution of the multipolymer of gained broadens, the adhesive tape of the manufacture of this multipolymer is used to reduce for the bounding force of polycarbonate plate and acrylic panel and the cohesive force of binder layer, under the high temperature conditions, the situation that cannot hinder fully in the growth with the bubble in the interface of polycarbonate plate or acrylic panel is had.If the use level of above-mentioned solvent is more than 300 weight parts, then, when using the multipolymer of gained to prepare binder composition, manufacturing adhesive tape, have the situation of the operation needed except desolventizing.
Above-mentioned polymerization starter is not particularly limited, such as, can enumerate persulphate, organo-peroxide, azo-compound etc.Wherein, if consider using the metallic film containing metal or metal oxide such as ITO as during bonded body on the impact that this metallic film causes, then preferred azo-compound.
Above-mentioned persulphate is not particularly limited, such as, can enumerate Potassium Persulphate, Sodium Persulfate, ammonium persulphate etc.Above-mentioned organo-peroxide is not particularly limited; such as can enumerate 1; two (the tertiary hexyl peroxy)-3 of 1-; 3; 5-trimethyl-cyclohexane, tertiary hexyl butylperoxy pivalate, t-butylperoxy pivalate, lauroyl peroxide, 2; 5-dimethyl-2; 5-two (2-ethylhexanoylperoxy) hexane, tertiary hexyl peroxy-2-ethylhexanoate, t-butylperoxy-2-ethylhexanoate, t-butylperoxy isobutyrate, t-butylperoxy-3; 5,5-tri-methyl hexanoic acid ester, t-butylperoxy laurate etc.Above-mentioned azo-compound is not particularly limited, such as can enumerate 2,2 '-Diisopropyl azodicarboxylate, 2,2 '-azo two (2,4-methyl pentane nitrile), 4,4 '-azo two (4-cyanopentanoic acid), 2,2 '-azo two (2-methylbutyronitrile), the two cyclohexanenitriles of azo etc.
These polymerization starters both can be used alone, and also two or more kinds may be used.
The use level of above-mentioned polymerization starter is not particularly limited, and is preferably 0.02 ~ 0.5 weight part relative to above-mentioned monomer mixture 100 weight part.If the use level of above-mentioned polymerization starter is less than 0.02 weight part, then polyreaction will be insufficient, has and need long situation in the polymerization.If the use level of above-mentioned polymerization starter is more than 0.5 weight part, then can the weight-average molecular weight of rewarding multipolymer becomes too low, molecular weight distribution becomes wide situation, the adhesive tape using this multipolymer to manufacture reduces for the bounding force of polycarbonate plate and acrylic panel and the cohesive force of binder layer, under the high temperature conditions, the situation that cannot hinder fully in the growth with the bubble in the interface of polycarbonate plate or acrylic panel is had.
The weight-average molecular weight of above-mentioned multipolymer is not particularly limited, but is preferably 200,000 ~ 1,500,000.If the weight-average molecular weight of above-mentioned multipolymer is less than 200,000, then the high-temperature elastic modulus of the binder layer of the adhesive tape of gained reduces, under the high temperature conditions, the situation that cannot hinder fully in the growth with the bubble in the interface of polycarbonate plate or acrylic panel is had.If the weight-average molecular weight of above-mentioned multipolymer is more than 1,500,000, then the mobility of multipolymer reduces, the adhesive tape using this multipolymer to manufacture reduces for the adaptation of polycarbonate plate and acrylic panel, under the high temperature conditions, the situation that cannot hinder fully in the growth with bubble in the interface of polycarbonate plate or acrylic panel is had.The weight-average molecular weight of above-mentioned multipolymer is more preferably 300,000 ~ 1,200,000, and more preferably 400,000 ~ 900,000.
And in this specification sheets, said weight-average molecular weight refers to and utilizes gel permeation chromatography (GPC) method, utilizes the value that polystyrene conversion determines.Specifically, it can be such as 100 times by above-mentioned multipolymer tetrahydrofuran (THF) (THF) dilution, by the diluent metre filter of gained, chromatographic column (trade(brand)name " 2690Separations Model " etc. of such as Waters Inc.) is used to utilize GPC method to measure the filtrate of gained.
Because the viscosity of above-mentioned multipolymer is low, therefore when using the binder composition containing this multipolymer to form binder layer, even if do not use solvent cut, also can be coated with well, the property disposed is excellent.In addition, owing to being coated with can not using solvent, be therefore easy to make thick binder layer, the bounding force of binder layer for polycarbonate plate and acrylic panel can be improved.The viscosity of above-mentioned multipolymer is not particularly limited, but the viscosity using Brookfield viscometer (" B8U type viscometer ", Tokyo gauge Inc.) to determine under the condition of temperature 25 DEG C is preferably 500 ~ 100000Pas.
Above-mentioned binder composition, except above-mentioned multipolymer, also can contain linking agent.
By containing above-mentioned linking agent, crosslinking structure can be formed in above-mentioned multipolymer.In addition, by suitably adjusting kind and the amount of above-mentioned linking agent, the percent gel of the binder layer of the adhesive tape of gained can be adjusted.
Above-mentioned linking agent is not particularly limited, such as, can enumerate isocyanate-based linking agent, aziridine system linking agent, epoxy linking agent, metallo-chelate type linking agent etc.Wherein, owing to being easy to embody the performance such as thermotolerance and weather resistance, therefore above-mentioned binder composition is preferably containing at least a kind of linking agent be selected from isocyanate-based linking agent and epoxy linking agent.
Above-mentioned isocyanate-based linking agent is not particularly limited, but preferred aliphat isocyanate-based linking agent.In the middle of above-mentioned aliphatic isocyanates system linking agent, as commercially available product, such as, can enumerate CORONATE HX (Japanese polyurethane society system) etc.
Above-mentioned epoxy linking agent is not particularly limited, but preferred aliphat epoxy linking agent.In the middle of above-mentioned aliphatic epoxy system linking agent, as commercially available product, such as, can enumerate DENACOL EX212, DENACOL EX214 (being all NAGASE CHEMTEX Inc.) etc.
The use level of above-mentioned linking agent is not particularly limited, but is preferably 0.1 ~ 10 weight part relative to above-mentioned copolymer 1 00 weight part.If the use level of above-mentioned linking agent is less than 0.1 weight part, then the crosslinked of above-mentioned multipolymer will be insufficient, the situation that the cohesive force that the adhesive tape of gained has a binder layer reduces and processibility is reduced, in addition, under the high temperature conditions, the situation that cannot hinder fully in the growth with the bubble in the interface of polycarbonate plate or acrylic panel is had.If the use level of above-mentioned linking agent is more than 10 weight parts, then the adhesive tape of gained has the situation that bounding force and initial bond for polycarbonate plate and acrylic panel reduce.The use level of above-mentioned linking agent is more preferably 0.3 ~ 3.0 weight part relative to above-mentioned copolymer 1 00 weight part.
Above-mentioned binder composition still can contain tackifying resin.
Above-mentioned tackifying resin is not particularly limited, but such as can enumerate xylene resin, resol, rosin series resin, terpene system resin etc.These tackifying resins both can be used alone, and also two or more kinds may be used.Wherein, preferred xylene resin, more preferably the alkylphenol reactant of xylene resin.In addition, preferably using the resin of hydrogenation as above-mentioned tackifying resin, by using this kind of resin, the transparency of adhesive tape can be improved.
Above-mentioned binder composition still can contain silane coupling agent.By containing silane coupling agent, the adhesive tape that can improve gained is for the adaptation of polycarbonate plate and acrylic panel.
Above-mentioned silane coupling agent is not particularly limited, but such as can enumerate vinyltrimethoxy silane, vinyltriethoxysilane, methacryloxypropyl trimethoxy silane, γ-methacryloyloxypropyl methyl dimethoxysilane, γ-glycidoxypropyltrime,hoxysilane, γ-glycidoxypropyl dimethoxysilane, γ-glycidoxypropyl diethoxy silane, 2-(3, 4-expoxycyclohexyl) ethyl trimethoxy silane, gamma-amino propyl trimethoxy silicane, γ aminopropyltriethoxy silane, gamma-amino oxypropyl trimethyl methoxy silane, N-(2-amino-ethyl) APTES, N-(2-amino-ethyl) 3-amino propyl methyl dimethoxysilane, γ mercaptopropyitrimethoxy silane, γ-Mercaptopropyltriethoxysilane, mercaptobutyl Trimethoxy silane, γ-mercaptopropyi methyl dimethoxysilane etc.
Above-mentioned binder composition also can as required also containing known additive.
Above-mentioned additive only otherwise the transparency of the adhesive tape of infringement gained, is just not particularly limited, such as, can enumerates weighting agent, protective agent etc.
The method manufacturing above-mentioned binder composition is not particularly limited, such as, can enumerate and above-mentioned multipolymer and the above-mentioned linking agent used as required, above-mentioned tackifying resin, above-mentioned silane coupling agent, above-mentioned additive be mixed and the method stirred.
Above-mentioned binder layer is preferably 1 × 10 at 20 DEG C measuring the shearing store elastic modulus under frequency 10Hz (G ') 5~ 1 × 10 7pa is 3 × 10 at 85 DEG C 4~ 1 × 10 5pa.If above-mentioned shearing store elastic modulus (G ') be less than 1 × 10 at 20 DEG C 5pa, or be less than 3 × 10 at 85 DEG C 4pa, then become large relative to the deformability of the binder layer stress, thus the situation that the cutting processing having adhesive tape reduces.If above-mentioned shearing store elastic modulus (G ') at 20 DEG C more than 1 × 10 7pa, or at 85 DEG C more than 1 × 10 5pa, then the wetting property at the initial stage of the binder layer of adhesive tape reduces, adaptation for polycarbonate plate or acrylic panel reduces, under the high temperature conditions, have cannot suppress fully with the situation heaving stripping that produces in the interface of polycarbonate plate or acrylic panel.
Above-mentioned binder layer is more preferably 1.2 × 10 at 20 DEG C measuring the shearing store elastic modulus under frequency 10Hz (G ') 5~ 8 × 10 6pa is 3.2 × 10 at 85 DEG C 4~ 9 × 10 4pa, preferred is further 1.4 × 10 at 20 DEG C 5~ 6 × 10 6pa is 3.4 × 10 at 85 DEG C 4~ 8 × 10 4pa.
And, shearing store elastic modulus in this specification sheets under said mensuration frequency 10Hz (G ') refers to, the shearing store elastic modulus that uses IT to measure the Measurement of Dynamic Viscoelasticity devices such as " DVA-200 " of Heat & Control Pty Ltd., determine with frequency 10Hz, heat-up rate 5 DEG C/min (G ').
Above-mentioned binder layer preferably in the temperature province of-25 ~ 25 DEG C, by the shearing loss Young's modulus (G ") at same mensuration temperature with shear store elastic modulus (G ') except and in the dissipation factor (tan δ) that obtains, there is maximal point.
Such as, in the case where there, namely, above-mentioned binder layer does not have maximal point in said temperature region in above-mentioned dissipation factor (tan δ), the above-mentioned dissipation factor (tan δ) of above-mentioned binder layer is more than 25 DEG C, then the wetting property at the initial stage of the binder layer of adhesive tape reduces, adaptation for polycarbonate plate or acrylic panel reduces, under the high temperature conditions, have cannot suppress with the situation heaving stripping that produces in the interface of polycarbonate plate or acrylic panel.In addition, such as in the case where there, namely, above-mentioned binder layer does not have maximal point in said temperature region in above-mentioned dissipation factor (tan δ), the above-mentioned dissipation factor (tan δ) of above-mentioned binder layer is less than-25 DEG C, then binder layer becomes soft, and the cutting processing of adhesive tape reduces, and the adhesive attachment having cutting tip hinders the situation of processing on cutting tool.
And, said in this specification sheets " in the temperature province of-25 ~ 25 DEG C, by the shearing loss Young's modulus (G ") at same mensuration temperature with shear store elastic modulus (G ') except and in the dissipation factor (tan δ) that obtains, there is maximal point " refer to, the Measurement of Dynamic Viscoelasticity devices such as " DVA-200 " of Heat & Control Pty Ltd. are measured at use IT, at-25 ~ 25 DEG C with frequency 10Hz, heat-up rate 5 DEG C/minute mensuration shearing loss Young's modulus (G ") and shearing store elastic modulus (G '), and transverse axis is set to temperature, when the longitudinal axis being set to dissipation factor (tan δ) and making graphic representation, in the scope of-25 ~ 25 DEG C, there is maximal point.
The percent gel of above-mentioned binder layer is not particularly limited, no matter be which kind of scope, can suppress under the high temperature conditions with the interface of polycarbonate plate or acrylic panel in produce heave stripping, therefore suitably can adjust matchingly with the purposes of adhesive tape, but wherein preferably 30 ~ 95 % by weight.If the percent gel of above-mentioned binder layer is less than 30 % by weight, then the situation that the processibility having adhesive tape reduces.If the percent gel of above-mentioned binder layer is more than 95 % by weight, then the wetting property at the initial stage of the binder layer of adhesive tape reduces, adaptation for polycarbonate plate and acrylic panel reduces, under the high temperature conditions, the situation that cannot hinder fully in the growth with the bubble in the interface of polycarbonate plate or acrylic panel is had.The percent gel of above-mentioned binder layer is more preferably 40 ~ 90 % by weight.
And above-mentioned percent gel can utilize following method to measure.
First, adhesive tape of the present invention be cut into the flat rectangular shape of 50mm × 25mm and make test film.Test film, is taken out via 200 object stainless (steel) wires after 24 hours with 23 DEG C of dippings by the test film of gained in ethyl acetate from ethyl acetate, drying 1 hour under the condition of 110 DEG C.After this, measure the weight of dried test film, use following formula (1) to calculate percent gel.And, in adhesive tape used in test film, there is no stacked release paper or mould release film.
Percent gel (% by weight)=100 × (W 2-W 0)/(W 1-W 0) (1)
In formula (1), W 0represent the weight of base material, W 1represent the weight of the test film before dipping, W 2represent dipping and the weight of dried test film.When adhesive tape does not have base material, W 0=0.
The thickness of above-mentioned binder layer is not particularly limited, but is preferably 20 ~ 500 μm.If the thickness of above-mentioned binder layer is less than 20 μm, then adhesive tape reduces for the bounding force of polycarbonate plate and acrylic panel, under the high temperature conditions, the situation that cannot hinder fully in the growth with the bubble in the interface of polycarbonate plate or acrylic panel is had.If the thickness of above-mentioned binder layer is more than 500 μm, then can produce oozing out of binder constituents, thus have the situation of the property disposed reduction.The thickness of above-mentioned binder layer is more preferably 20 ~ 300 μm.
Total light penetration in the visible wavelength region of adhesive tape of the present invention is more than 90%, and turbidity value is less than 1%.If the total light penetration in above-mentioned visible wavelength region be less than 90% or above-mentioned turbidity value more than 1%, then adhesive tape the transparency reduce, be difficult to be applicable to optical applications.
Adhesive tape of the present invention is preferably for being attached to the adhesive tape on polycarbonate plate or acrylic panel.
In addition, adhesive tape of the present invention is preferably more than 3N/25mm relative to 180 ° of peeling forces of polycarbonate plate or acrylic panel under the peeling rate of 0.3mm/ minute.If above-mentioned peeling force is less than 3N/25mm, then adhesive tape have under the high temperature conditions cannot suppress fully with the situation heaving stripping that produces in the interface of polycarbonate plate or acrylic panel.And the present inventor etc. think, the peeling rate of 0.3mm/ minute be evaluate using polycarbonate plate or acrylic panel as during bonded body heave the phenomenon peeling off progress time the speed that is applicable to.
Adhesive tape of the present invention is more preferably more than 3.2N/25mm, more preferably more than 3.4N/25mm relative to 180 ° of peeling forces of polycarbonate plate or acrylic panel under the peeling rate of 0.3mm/ minute.
And, refer to relative to 180 ° of peeling forces of polycarbonate plate or acrylic panel the value utilizing following method to calculate in this specification sheets under the peeling rate of said 0.3mm/ minute.
First, adhesive tape is cut out the planeform of cutting as having 25mm × 100mm.The demoulding pet film of the side cutting out the adhesive tape after cutting is peeled off, exposes binder layer.Then, at the pet film of thick 50 μm of the face of exposing of adhesive tape laminating.In addition, the demoulding pet film of the opposing party of adhesive tape is peeled off, expose binder layer, by moving back and forth the rubber rollers of a 2.0kg on polycarbonate plate or acrylic panel with the speed of 300mm/ minute to the face of exposing of adhesive tape, and polycarbonate plate or acrylic panel and adhesive tape are fitted, place 24 hours at 23 DEG C, prepare out test sample.
For the test sample of gained, the tension test in 180 ° of directions is carried out, using the value of gained as the 180 ° of peeling forces (N/25mm) relative to polycarbonate plate or acrylic panel under the peeling rate of 0.3mm/ minute with the peeling rate of 0.3mm/ minute.
Adhesive tape of the present invention both can be do not have base material without support type, also can be the support type being formed with binder layer on the two sides of base material.
As long as above-mentioned base material has the base material of the transparency, just be not particularly limited, such as can enumerate be made up of transparent resins such as acrylic resin, polyolefine, polycarbonate, polyvinyl chloride, acronitrile-butadiene-styrene (ABS) resin, polyethylene terephthalate (PET), nylon, urethane, polyimide thin slice, the thin slice with cancellous structure, offer porose thin slice etc.
The thickness of above-mentioned base material is not particularly limited, but is preferably 2 ~ 200 μm.If the thickness of above-mentioned base material is less than 2 μm, then the undercapacity of the adhesive tape of gained, thus have breakage, be difficult to dispose situation.If the thickness of above-mentioned base material is more than 200 μm, then the stiffening of base material is spent by force, thus has situation about being deteriorated to other tracing ability of difference of height of the adhesive tape of gained.The thickness of above-mentioned base material is more preferably 5 ~ 100 μm.
Adhesive tape of the present invention also can have and is laminated in release paper on above-mentioned binder layer or mould release film.
Above-mentioned release paper or mould release film are not particularly limited, such as, can enumerate and implement demoulding process to the synthetic resin film be made up of polyester based resin, polyethylene-based resin, polypropylene-based resin, polyvinyl chloride, nylon etc. and the release paper etc. that forms peel ply in the high body paper of the surface smoothnesss such as the mould release film, fine paper or the glassine paper that obtain and obtain.
The thickness of above-mentioned release paper or mould release film is not particularly limited, but preferably 12 ~ 125 μm.If above-mentioned thickness departs from above-mentioned scope, then the situation that the cutting processing having adhesive tape reduces.The thickness of above-mentioned release paper or mould release film is more preferably 20 ~ 100 μm.In addition, the center line average roughness (Ra) of above-mentioned release paper or mould release film is not particularly limited, but is preferably less than 0.2 μm.
The method manufacturing adhesive tape of the present invention is not particularly limited, such as the method manufactured without the adhesive tape of support type, following method can be enumerated, namely, binder layer is formed by binder composition being coated the demoulding treated side of release paper or mould release film, on the binder layer of gained, the mode of the facing state of demoulding treated side and binder layer is made to superpose the new release paper for preparing or mould release film and after obtaining duplexer to be formed, by pressurizations such as the duplexer rubber rollers of gained.
The purposes of adhesive tape of the present invention is not particularly limited; but when manufacturing the image display device such as portable phone, mobile information terminal, can in order to use fitting for the protection of the protecting sheet on the surface of being made up of polycarbonate plate or acrylic panel and the surface of the image display device such as display pannel or touch panel (with reference to Fig. 5).In addition, can also in order to display pannel or touch panel and the surface of supporting mass of being made up of polycarbonate plate or acrylic panel be fitted and are used.
The adhesive tape transparency of the present invention is high, thus can also be applicable to require in the optical applications of high transparent to the laminating etc. on display pannel or touch panel.In addition, because polycarbonate plate and acrylic panel easily absorb moisture, therefore the easy Exhaust Gas because producing under the high temperature conditions reason and with the interface of binder layer in produce and heave stripping, but the adhesive tape of the application of the invention, can effectively suppress this kind to heave stripping.
Duplexer polycarbonate plate or acrylic panel attached on the transparent electrodes by adhesive tape of the present invention is also one of the present invention.
Above-mentioned polycarbonate plate or acrylic panel are not particularly limited; but be such as preferably polycarbonate plate used or acrylic panel in image display device etc., the polycarbonate plate preferably used as the protecting sheet on the surface for the protection of image display device etc. or acrylic panel.
As above-mentioned transparency electrode, such as, ITO electrode etc. can be enumerated.
As long as polycarbonate plate or acrylic panel to attach by adhesive tape of the present invention and be just not particularly limited on the transparent electrodes by duplexer of the present invention, such as, can enumerate duplexer used in image display device etc.
The image display device with duplexer of the present invention is also one of the present invention.
As image display device of the present invention, such as, can enumerate the touch panel such as resistive touch panel, capacitive touch panel etc.
Above-mentioned resistive touch panel such as has protecting sheet, upper transparent electrode, the distance piece be made up of polycarbonate plate or acrylic panel successively and has the supporting mass of lower transparent electrode.One example of this kind of resistive touch panel is shown in Fig. 3.
In resistive touch panel shown in Fig. 3, by adhesive tape 2 of the present invention, the protecting sheet 1 be made up of polycarbonate plate or acrylic panel and upper transparent electrode 3 are fitted.In addition, by adhesive tape 6 of the present invention, supporting mass 7 and lower transparent electrode 5 are fitted.Supporting mass 7 and lower transparent electrode 5 both can utilize adhesive tape of the present invention to fit, and the adhesive tape beyond adhesive tape of the present invention also can be utilized to fit.In addition, supporting mass 7 and lower transparent electrode 5 also can utilize the method beyond adhesive tape stacked.And in the resistive touch panel shown in Fig. 3, adhesive tape of the present invention is double-sided adhesive tape.
Above-mentioned capacitive touch panel such as has the protecting sheet be made up of polycarbonate plate or acrylic panel, the sheet glass and the supporting mass that are formed with ito film at the table back side.One example of this kind of capacitive touch panel is shown in Fig. 4.
In capacitive touch panel shown in Fig. 4, by adhesive tape 9 of the present invention, the protecting sheet 8 be made up of polycarbonate plate or acrylic panel and the sheet glass 11 that is formed with ito film 10 and 12 at the table back side are fitted.In addition, by adhesive tape 13 of the present invention, by supporting mass 14 and sheet glass (opposite face) laminating being formed with ito film at the table back side.Supporting mass 14 both can utilize adhesive tape of the present invention to fit with at the sheet glass showing the back side and be formed with ito film, and the adhesive tape beyond adhesive tape of the present invention also can be utilized to fit.In addition, supporting mass 14 also can utilize the method beyond adhesive tape stacked with at the sheet glass showing the back side and be formed with ito film.And in the capacitive touch panel shown in Fig. 4, adhesive tape of the present invention is double-sided adhesive tape.
According to the present invention, though can provide the transparency high, for the bounding force excellence of polycarbonate plate and acrylic panel also can suppress under the high temperature conditions with the adhesive tape heaving stripping that produces in the interface of polycarbonate plate or acrylic panel.In addition, according to the present invention, the duplexer and image display device that use this adhesive tape to manufacture can be provided.
Accompanying drawing explanation
Fig. 1 is the photo producing in the evaluation of state the test sample using the double-sided adhesive tape obtained in embodiment 1 to make at bubble.
Fig. 2 is the photo producing in the evaluation of state the test sample using the double-sided adhesive tape obtained in comparative example 1 to make at bubble.
Fig. 3 (a) and (b) are sectional view and the stereographic map of the example schematically shown when being attached in transparency electrode by the protecting sheet be made up of polycarbonate plate or acrylic panel by adhesive tape of the present invention.
Fig. 4 (a) and (b) are sectional view and the stereographic map of the example schematically shown when being attached in transparency electrode by the protecting sheet be made up of polycarbonate plate or acrylic panel by adhesive tape of the present invention.
Fig. 5 is the sectional view of the example schematically shown when to be attached at by protecting sheet on the surface of image display device by adhesive tape of the present invention.
Wherein, 1 protecting sheet, 2 adhesive tapes, 3 upper transparent electrode, 4 distance pieces, 5 lower transparent electrode; 6 adhesive tapes, 7 supporting masses, 8 protecting sheets, 9 adhesive tapes, 10ITO film, 11 sheet glass; 12ITO film, 13 adhesive tapes, 14 supporting masses, 15 protecting sheets, 16 adhesive tapes, 17 image display devices
Embodiment
Below will enumerate embodiment and more specific description be carried out to mode of the present invention, but the present invention be not limited to these embodiments.
(embodiment 1)
(1) manufacture of double-sided adhesive tape
To in the reactor possessing thermometer, stirrer, cooling tube, add 2-EHA 89.3 weight part, isobornyl acrylate 10 weight part, vinylformic acid 0.5 weight part, vinylformic acid 2-hydroxy methacrylate 0.2 weight part and be the ethyl acetate of 100 weight parts relative to these monomer 100 weight parts, after carrying out nitrogen replacement, reactor heating and start backflow.Then, will be the diluted ethyl acetate of tertiary hexyl butylperoxy pivalate 5 weight parts as polymerization starter of 0.2 weight part relative to monomer 100 weight part, the polymerization starter solution of gained will be added drop-wise in above-mentioned reactor with 2 hours.Thereafter, at 70 DEG C, reflux from the interpolation of polymerization starter 8 hours, obtain the acrylic acid copolymer soln that solids component is 50%.
To the acrylic copolymer of gained, use thermal decomposer (Frontier-Lab Inc., Doubleshot Hydrolyzer), GC-MS device (NEC Inc., Q-1000GC), FT-IR (Thermo Fisher Scientific Inc., NICOLET6700) and NMR (NEC Inc., JNM-ECA400), determine the ratio (% by weight) of the structural unit deriving from each monomer forming acrylic copolymer.The ratio (% by weight) of the structural unit of gained is shown in table 1.
In addition, to the acrylic copolymer of gained, the weight-average molecular weight of Waters Inc. " 2690Separations Model " polystyrene conversion that utilizes GPC method to determine is used to be about 500,000 as chromatographic column.
To in acrylic copolymer 100 weight part of gained, add the CORONATE HX (Japanese polyurethane Inc.) of 0.5 weight part as linking agent, stir, obtain binder composition.The demoulding treated side binder composition of gained being coated demoulding pet film forms binder layer, on the binder layer of gained, obtain duplexer to form the demoulding pet film that makes the mode of the facing state of demoulding treated side and binder layer superpose newly to prepare.By utilizing rubber rollers to be pressurizeed by the duplexer of gained, and obtain the double-sided adhesive tape being pasted with demoulding pet film on two sides.
(2) mensuration of percent gel
Double-sided adhesive tape is cut into the flat rectangular shape of 50mm × 25mm, produces the test film not having stacked release paper or mould release film, determine the weight W of made test film 1.Test film, is taken out via 200 object stainless (steel) wires after 24 hours at 23 DEG C of dippings by test film in ethyl acetate from ethyl acetate, drying 1 hour under the condition of 110 DEG C.Measure the weight W of dried test film 2, utilize formula (1) to calculate percent gel.
(3) the total light penetration in visible wavelength region and the mensuration of turbidity value
Double-sided adhesive tape is fitted on slide glass (trade(brand)name " S-1214 ", MATSUNAMI Inc.), produce the test film of the Rotating fields with binder layer/slide glass, use turbidometer (full-automatic turbidometer " TC-HIIIDPK ", East Jing electricity look Inc.) to determine total light penetration in the visible wavelength region of this test film and turbidity value (%).
(4) mensuration of bounding force
Double-sided adhesive tape is cut out the planeform of cutting as having 25mm × 100mm.The demoulding pet film cutting out a side of the double-sided adhesive tape cut out is peeled off, exposes binder layer.Then, on pet film, the face of exposing of laminating double-sided adhesive tape.In addition, the demoulding pet film of the opposing party of double-sided adhesive tape is peeled off, expose binder layer, by the face of exposing at polycarbonate plate (PC plate) upper laminating double-sided adhesive tape, and obtain the laminated samples sequentially laminated with double-sided adhesive tape and pet film on polycarbonate plate (PC plate).Thereafter, the rubber rollers of 2.0kg is placed on the pet film of the laminated samples of gained, by making rubber rollers move back and forth once with the speed of 300mm/ minute, and polycarbonate plate (PC plate) and double-sided adhesive tape are fitted, place 20 minutes at 23 DEG C, prepare out test sample.
In addition, replace above-mentioned polycarbonate plate (PC plate) plate and use acrylic panel, similarly preparing out test sample.
To the test sample of gained, according to JIS Z0237, carry out the tension test in 180 ° of directions with the peeling rate of 300mm/ minute, determine bounding force (N/25mm).
(5) bubble produces state (resistance to foaminess test)
Double-sided adhesive tape is cut out the planeform of cutting as having 45mm × 60mm.The demoulding pet film cutting out a side of the double-sided adhesive tape cut out is peeled off, exposes binder layer.Then, at thickness be 0.5mm pet film on, laminating double-sided adhesive tape the face of exposing.In addition, the demoulding pet film of the opposing party of double-sided adhesive tape is peeled off, expose binder layer, by the face of exposing of the upper laminating of the polycarbonate plate (PC plate) with the planeform double-sided adhesive tape that at thickness is 2.0mm, and obtain the laminated samples sequentially laminated with double-sided adhesive tape and pet film on polycarbonate plate (PC plate).Thereafter, by the laminated samples of gained under the condition of temperature 85 DEG C, or leave standstill 500 hours at temperature 60 C and under the condition of relative humidity (RH) 90%, obtain test sample.The bubble in the bonding interface of the test sample of visual observation gained is utilized to produce state.
The situation of the bubble not observing the size of more than 0.01mm is completely set to "○", the situation observing the bubble of the size of 1 ~ 5 more than 0.01mm in every 1 test sample is set to " △ ", the situation observing the bubble of the size of more than the 0.01mm of more than 6 in every 1 test sample is set to "×", have rated bubble and produce state.
And, represent the photo of the test sample of the embodiment 1 of the bubble of the size not observing more than 0.01mm completely in Fig. 1, in Fig. 2, represent the photo observing the test sample of the comparative example 1 of the bubble of the size of 6 more than 0.01mm.
(embodiment 2 ~ 15 and comparative example 1 ~ 6)
Except the monomer composition by changing acrylic copolymer, and beyond the acrylic copolymer obtaining the ratio (% by weight) with the structural unit shown in table 1 or 2, make double-sided adhesive tape identically with embodiment 1, carried out each mensuration.
(embodiment 16 ~ 21 and comparative example 7 ~ 10)
(1) manufacture of double-sided adhesive tape
Except by the monomer of acrylic copolymer composition and the addition of linking agent as shown in table 3 change except, obtain double-sided adhesive tape identically with embodiment 1.
(2) mensuration of percent gel
Calculate percent gel identically with embodiment 1.
(3) the total light penetration in visible wavelength region and the mensuration of turbidity value
Determine the total light penetration in visible wavelength region and turbidity value identically with embodiment 1.
(4) relative to the mensuration of 180 ° of peeling forces of polycarbonate plate or acrylic panel
Double-sided adhesive tape is cut out the planeform of cutting as having 25mm × 100mm.The demoulding pet film cutting out a side of the double-sided adhesive tape cut out is peeled off, exposes binder layer.Then, at the pet film of thick 50 μm of the face of exposing of double-sided adhesive tape laminating.In addition, the demoulding pet film of the opposing party of double-sided adhesive tape is peeled off, expose binder layer, by moving back and forth the rubber rollers of a 2.0kg on polycarbonate plate or acrylic panel with the speed of 300mm/ minute to the face of exposing of adhesive tape, and polycarbonate plate or acrylic panel and adhesive tape are fitted, place 24 hours at 23 DEG C, prepare out test sample.
To the test sample of gained, carry out the tension test in 180 ° of directions with the peeling rate of 0.3mm/ minute, determine the 180 ° of peeling forces (N/25mm) relative to polycarbonate plate or acrylic panel under the peeling rate of 0.3mm/ minute.
(5) shearing modulus of elasticity of binder layer measures
By double-sided adhesive tape superposition being obtained the double-sided adhesive tape of thick 1mm.Measurement of Dynamic Viscoelasticity device (IT measures Heat & Control Pty Ltd.'s system, DVA-200) is utilized to determine the shearing store elastic modulus (G ') of 20 DEG C of the double-sided adhesive tape of gained and 85 DEG C with frequency 10Hz, heat-up rate 5 DEG C/min.In addition, Measurement of Dynamic Viscoelasticity device (IT measures Heat & Control Pty Ltd.'s system, DVA-200) is utilized to determine the shearing loss Young's modulus (G ") of-25 ~ 25 DEG C with frequency 10Hz, heat-up rate 5 DEG C/min and shear store elastic modulus (G '); transverse axis to be set to temperature, the longitudinal axis to be set to dissipation factor (tan δ) and to make graphic representation, judging whether having maximal point in the scope of-25 ~ 25 DEG C.
And, in table 3, writing its temperature there is maximal point in the scope of-25 ~ 25 DEG C, being recited as "None" when not having maximal point.
(6) bubble produces state (resistance to foaminess test)
Double-sided adhesive tape is cut out the planeform of cutting as having 45mm × 60mm.The demoulding pet film cutting out a side of the double-sided adhesive tape cut out is peeled off, exposes binder layer.Then, to fit in the face of exposing of double-sided adhesive tape the pet film of thick 0.5mm.In addition, the demoulding pet film of the opposing party of double-sided adhesive tape is peeled off, expose binder layer, by moving back and forth the rubber rollers of 1 2.0kg on the polycarbonate plate with planeform or acrylic panel of thick 2.0mm with the speed of 300mm/ minute to the face of exposing of adhesive tape, and polycarbonate plate or acrylic panel and double-sided adhesive tape are fitted, 60 DEG C, carry out process in 20 minutes in the autoclave of 0.5MPa, prepare out test sample.
To the test sample of gained, for polycarbonate plate and acrylic panel under the condition of temperature 85 DEG C, or at temperature 60 C and under the condition of relative humidity (RH) 90%, leave standstill 500 hours, utilize the bubble in visual observation bonding interface to produce state.
The situation of the bubble not observing the size of more than 0.01mm is completely set to "○", the situation observing the bubble of the size of 1 more than 0.01mm in every 1 test sample is set to " zero ~ △ ", the situation observing the bubble of the size of 2 ~ 5 more than 0.01mm in every 1 test sample is set to " △ ", the situation observing the bubble of the size of more than the 0.01mm of more than 6 in every 1 test sample is set to "×", have rated and heave stripping state.
(7) cutting processing test (state of double-sided adhesive tape end face)
To double-sided adhesive tape, cutting tool is used to carry out the blanking operation of 40 times, the wire drawing of the tackiness agent when cutter pollution utilizing visual observation to produce on cutting tool because of adhesive attachment and blanking operation.
To not see that the cutter produced because of adhesive attachment pollutes, also do not see that the situation of the wire drawing of tackiness agent is set to "○", although will see that some cutters pollute but do not see that the situation of wire drawing is set to " △ ", can see that cutter pollutes and can see that the situation of wire drawing is set to "×", have rated cutting processing.
Industrial utilizability
According to the present invention, though can provide the transparency high, for the bounding force excellence of polycarbonate plate and acrylic panel also can suppress under the high temperature conditions with the adhesive tape heaving stripping that produces in the interface of polycarbonate plate or acrylic panel.In addition, according to the present invention, the duplexer and image display device that use this adhesive tape to manufacture can be provided.

Claims (17)

1. an adhesive tape, it has the binder layer formed by the binder composition containing multipolymer, it is characterized in that,
Described multipolymer has the structural unit that derives from the monomer in molecule with twin nuclei and 1 alkene double bond and derives from the structural unit of (methyl) acrylate monomer with the structure represented with following general formula (1),
The described ratio of structural unit shared by described copolymer 1 00 weight part deriving from the monomer in molecule with twin nuclei and 1 alkene double bond is 10 ~ 55 weight parts,
The ratio shared in described copolymer 1 00 weight part of the described structural unit deriving from (methyl) acrylate monomer with the structure represented with described general formula (1) is 30 ~ 85 weight parts,
Except derive from the monomer in molecule with twin nuclei and 1 alkene double bond structural unit and derive from (methyl) acrylate monomer with the structure represented with following general formula (1) structural unit except the structural unit from other monomer, ratio shared in described copolymer 1 00 weight part is below 20 weight parts, other monomer described is the monomer with polar group
Total light penetration in visible wavelength region is more than 90%, and turbidity value is less than 1%,
The weight-average molecular weight of described multipolymer is 200,000 ~ 1,500,000,
In general formula (1), R 1represent hydrogen atom or methyl, R 2represent that carbon number is the alkyl of 3 ~ 14; R 2the hydrogen atom of alkyl also can by cycloalkyl substituted.
2. adhesive tape according to claim 1, is characterized in that, the monomer in molecule with twin nuclei and 1 alkene double bond is the monomer with isobornyl.
3. adhesive tape according to claim 1, is characterized in that, the monomer in molecule with twin nuclei and 1 alkene double bond is the monomer with (methyl) acryl.
4. adhesive tape according to any one of claim 1 to 3, it is characterized in that, (methyl) acrylate monomer with the structure represented with general formula (1) contains at least 1 (methyl) acrylate monomer be selected from (methyl) 2-EHA, (methyl) Octyl acrylate and (methyl) butyl acrylate.
5. adhesive tape according to any one of claim 1 to 3, it is characterized in that, multipolymer also has the structural unit deriving from and have the monomer being selected from least 1 polar group in carboxyl, hydroxyl, amide group, amino, epoxy group(ing), aldehyde radical and isocyanate group and 1 alkene double bond in molecule.
6. adhesive tape according to any one of claim 1 to 3, is characterized in that, binder composition is also containing at least a kind of linking agent be selected from isocyanate-based linking agent and epoxy linking agent.
7. adhesive tape according to claim 5, is characterized in that, binder composition is also containing at least a kind of linking agent be selected from isocyanate-based linking agent and epoxy linking agent.
8. adhesive tape according to claim 6, is characterized in that, isocyanate-based linking agent and epoxy linking agent are aliphatic isocyanates system linking agent and aliphatic epoxy system linking agent respectively.
9. adhesive tape according to claim 7, is characterized in that, isocyanate-based linking agent and epoxy linking agent are aliphatic isocyanates system linking agent and aliphatic epoxy system linking agent respectively.
10. adhesive tape according to any one of claim 1 to 3, is characterized in that, the shearing store elastic modulus G ' under the mensuration frequency 10Hz of binder layer is 1 × 10 20 DEG C time 5~ 1 × 10 7pa is 3 × 10 85 DEG C time 4~ 1 × 10 5pa, and in the temperature province of-25 ~ 25 DEG C, by the shearing loss Young's modulus G at same mensuration temperature " with shear store elastic modulus G ' except and in the dissipation factor tan δ that obtains, there is maximal point.
11. adhesive tapes according to any one of claim 1 to 3, is characterized in that, the percent gel of binder layer is 30 ~ 95 % by weight.
12. adhesive tapes according to any one of claim 1 to 3, is characterized in that, the thickness of binder layer is 20 ~ 500 μm.
13. adhesive tapes according to any one of claim 1 to 3, is characterized in that, are attached on polycarbonate plate or acrylic panel.
14. adhesive tapes according to claim 13, is characterized in that, are more than 3N/25mm relative to 180 ° of peeling forces of polycarbonate plate or acrylic panel under the peeling rate of 0.3mm/ minute.
15. 1 kinds of duplexers, is characterized in that, polycarbonate plate or acrylic panel are attached on the transparent electrodes by the adhesive tape according to any one of claim 1 to 14.
16. duplexers according to claim 15, is characterized in that, polycarbonate plate or acrylic panel are the protecting sheets on the surface for the protection of image display device.
17. 1 kinds of image display devices, is characterized in that, have duplexer according to claim 16.
CN201410493533.8A 2009-07-16 2010-07-16 Pressure-sensitive adhesive tape, laminate, and image display device Pending CN104277745A (en)

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