CN107286856A - Adhesive composition and bonding sheet - Google Patents

Adhesive composition and bonding sheet Download PDF

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Publication number
CN107286856A
CN107286856A CN201710212454.9A CN201710212454A CN107286856A CN 107286856 A CN107286856 A CN 107286856A CN 201710212454 A CN201710212454 A CN 201710212454A CN 107286856 A CN107286856 A CN 107286856A
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CN
China
Prior art keywords
bonding sheet
adhesive composition
bonding
sheet according
construction unit
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CN201710212454.9A
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Chinese (zh)
Inventor
稻男洋
稻男洋一
山口征太郎
川田智史
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Lintec Corp
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Lintec Corp
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Publication of CN107286856A publication Critical patent/CN107286856A/en
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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
    • 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
    • C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
    • C09J11/02—Non-macromolecular additives
    • C09J11/06—Non-macromolecular additives organic
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
    • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
    • C08F220/04—Acids; Metal salts or ammonium salts thereof
    • C08F220/06—Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
    • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
    • C08F220/10—Esters
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
    • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
    • C08F220/10—Esters
    • C08F220/12—Esters of monohydric alcohols or phenols
    • C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
    • C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
    • 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
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
    • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
    • C08F220/10—Esters
    • C08F220/12—Esters of monohydric alcohols or phenols
    • C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
    • C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
    • C08F220/1804—C4-(meth)acrylate, e.g. butyl (meth)acrylate, isobutyl (meth)acrylate or tert-butyl (meth)acrylate
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/16—Nitrogen-containing compounds
    • C08K5/29—Compounds containing one or more carbon-to-nitrogen double bonds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/08—Stabilised against heat, light or radiation or oxydation
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2203/00—Applications
    • C08L2203/20—Applications use in electrical or conductive gadgets
    • 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
    • C09J2203/326—Applications of adhesives in processes or use of adhesives in the form of films or foils for bonding electronic components such as wafers, chips or semiconductors
    • 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
    • C09J2301/12—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers
    • C09J2301/122—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers the adhesive layer being present only on one side of the carrier, e.g. single-sided adhesive tape
    • 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
    • C09J2301/12—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers
    • C09J2301/124—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers the adhesive layer being present on both sides of the carrier, e.g. double-sided adhesive tape
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
    • C09J2301/312—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier parameters being the characterizing feature
    • 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
    • C09J2433/00—Presence of (meth)acrylic polymer
    • 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
    • C09J2467/00—Presence of polyester
    • C09J2467/006—Presence of polyester in the substrate

Abstract

The present invention relates to a kind of bonding sheet, it has the adhesive phase formed by adhesive composition, described adhesive composition contains acrylic copolymers (A) more than 50 mass %, the acrylic copolymer (A) includes the construction unit (a1) of (methyl) alkyl acrylate (a1) for deriving from the alkyl with carbon number 1~20, and contain 3 moles of more than % construction unit (a2) from acrylic acid derivative (a2), there is the acrylic acid derivative (a2) glass transition temperature of carboxyl and its homopolymer to be less than 80 DEG C.Even if the bonding sheet is by the adhesive phase filming to less than 10.0 μm, it may have high adhesion, and heat-resisting xanthochromia is excellent.

Description

Adhesive composition and bonding sheet
It is on October 9th, 2013, Application No. 201380053363.5, entitled " bonding the applying date that the application, which is, The divisional application of the application of agent composition and bonding sheet ".
Technical field
The present invention relates to adhesive composition and the bonding with the adhesive phase formed by the adhesive composition Piece, it is more particularly to a kind of even if the bonding sheet that will also there is desired bonding force during adhesive phase filming.
Background technology
Coating weight of the bonding force of bonding sheet dependent on adhesive on matrix material, that is, the adhesive dependent on formation The thickness of layer.The thickness of adhesive phase can be set according to various purposes in bonding sheet used in label, adhesive tape etc., but from From the viewpoint of showing enough bonding forces, hardly by its filming to less than 10.0 μm.
However, the slimming of instrument is required for electronic instrument, optical instrument etc. in recent years, for electronic instrument and optics The bonding sheet when engagement or processing of the component of instrument used in temporary bond etc. similarly requires filming.
The bonding sheet of temporary bond is had during for engagement or processing for electronic instrument and the component of optical instrument Adhesive phase filming, it is proposed that various schemes.
For example, in patent document 1~3, in order to improve releasable, adhesive phase filming is sought reduction bond Power.
As patent document 1~3, the method for reduction bonding force is used as, although have the method for making adhesive phase filming, But it can not also reduce the bonding force of bonding sheet even if by adhesive phase filming sometimes.
For example, a kind of surface protection film of use rubber adhesive is disclosed in patent document 4 and 5, to provide Even if the thickness of thin membranization of adhesive phase is still had into good adhesion reliability (bonding force) to optical component to 2~10 μm Optics surface protection film.
In addition, Patent Document 6 discloses a kind of adhesive optical film for having used following adhesives, described adhesive Comprising the weight average molecular weight formed by specific monomer big (methyl) acrylic polymer and crosslinking agent, even if will to provide Adhesive phase is thinned to can also meet the adhesive optical film of durability in the case of 1~15 μm.
In addition, Patent Document 7 discloses a kind of bonding sheet using following adhesives, described adhesive is by acrylic acid The polyurethane resin that analog copolymer is formed with specified raw material is with 40/60~1/99 content ratio (acrylic copolymer/polyurethane Resin) formed, to provide even if by adhesive phase filming to can also show the bonding of high adhesion in the case of 5 μm Piece.
Prior art literature
Patent document
Patent document 1：Japanese Unexamined Patent Publication 2005-007618 publications
Patent document 2：Japanese Unexamined Patent Publication 2006-281488 publications
Patent document 3：Japanese Unexamined Patent Publication 2009-158503 publications
Patent document 4：Japanese Unexamined Patent Publication 2008-133435 publications
Patent document 5：Japanese Unexamined Patent Publication 2008-102271 publications
Patent document 6：Japanese Unexamined Patent Publication 2007-277510 publications
Patent document 7：No. WO2011/122178
The content of the invention
The invention problem to be solved
However, for diaphragm and optical film described in patent document 4~6, during by adhesive phase filming, bonding Power is still not enough.
Although in addition, bonding force of the bonding sheet described in patent document 7 after filming is preferably, when being used under high temperature , there is problem in terms of heat-resisting xanthochromia in easy xanthochromia.
It is an object of the invention to provide a kind of adhesive composition and with gluing for being formed by the adhesive composition The bonding sheet of mixture layer, described adhesive composition also there is height to bond even if by adhesive phase filming to less than 10.0 μm Power, can act as the adhesive phase of the excellent bonding sheet of heat-resisting xanthochromia.
The method for solving problem
The discovery such as the present inventor, can by using the adhesive composition of the acrylic copolymer (A) containing specified rate To solve above-mentioned problem, the construction unit from specific monomer of the acrylic copolymer (A) containing specified quantitative.
That is, the present invention provides following (1)~(12).
(1) a kind of adhesive composition, it contains acrylic copolymers (A) more than 50 mass %, the acrylic acid Analog copolymer (A) includes the structure list of (methyl) alkyl acrylate (a1) for deriving from the alkyl with carbon number 1~20 First (a1), and containing 3 moles of more than % construction unit (a2) from acrylic acid derivative (a2), the acrylic acid spreads out Biological (a2) there is the glass transition temperature of carboxyl and its homopolymer to be less than 80 DEG C.
(2) adhesive composition described in above-mentioned (1), wherein, acrylic acid derivative (a2) is comprising shown in following formulas (1) Compound.
[chemical formula 1]
(in formula (1), R1Hydrogen atom or methyl are represented, X represents the optionally alkylidene with substituent or following formula (2) institute The group shown.)
[chemical formula 2]
(in formula (2), Y1And Y2Represent that optionally there is the alkylidene of substituent independently of one another, also, * and * * represent bonding The bonded portion of carboxyl side in part, * * expressions (1).)
(3) adhesive composition described in above-mentioned (1) or (2), wherein, acrylic acid derivative (a2) is mono succinate (2- Acrylyl oxy-ethyl) at least one of ester and acrylic acid 2- carboxyethyls.
(4) adhesive composition any one of above-mentioned (1)~(3), wherein, institute in acrylic copolymer (A) The mol ratio [construction unit (a1)/construction unit (a2)] of the construction unit (a1) contained and construction unit (a2) is 50/50~97/ 3。
(5) adhesive composition any one of above-mentioned (1)~(4), wherein, the weight of acrylic copolymer (A) Average molecular weight is 100,000~1,500,000.
(6) adhesive composition any one of above-mentioned (1)~(5), described adhesive composition is also containing crosslinking Agent (B).
(7) contained increasing in the adhesive composition any one of above-mentioned (1)~(6), described adhesive composition The content of stick is below 5 mass %.
(8) adhesive composition any one of above-mentioned (1)~(7), the vitrifying of described adhesive composition turns Temperature is -70~-5 DEG C.
(9) a kind of bonding sheet, it has as any one of above-mentioned (1)~(8) in the one or both sides of matrix material Adhesive composition formation adhesive phase.
(10) bonding sheet described in above-mentioned (9), wherein, described adhesive layer thickness for more than 0.01 μm and 10.0 μm with Under.
(11) bonding sheet described in above-mentioned (9), wherein, described adhesive layer thickness for more than 0.01 μm and 2.5 μm with Under.
(12) bonding sheet any one of above-mentioned (9)~(11), it is in 23 DEG C, 50%RH (relative humidity) environment Under be pasted on after glass plate, the variable quantity (Δ YI) of the yellow chromaticity after standing 7 days in the environment of 120 DEG C is less than 1.0.
The effect of invention
Even if used the present invention adhesive composition bonding sheet by adhesive phase filming to less than 10.0 μm, With high adhesion, and with excellent heat-resisting xanthochromia.
Brief description of the drawings
Fig. 1 (a) and Fig. 1 (b) are the profiles for a mode for showing the bonding chip architecture (one side bonding sheet) of the present invention.
Fig. 2 (a) and Fig. 2 (b) are the profiles for a mode for showing the bonding chip architecture (double-sided adhesive sheet) of the present invention.
Symbol description
1a, 1b, 2a, 2b bonding sheet
11 matrix materials
12nd, 12a, 12b adhesive phase
13rd, 13a, 13b stripping film
Embodiment
In the description of this specification, for example, " (methyl) acrylic acid " is intended to indicate that " acrylic acid " and " metering system The word of both acid ", other similar words are similarly.
In addition, in the present invention, the value of weight average molecular weight (Mw) is determined and converted using gel permeation chromatography (GPC) method It is the value determined based on the method described in embodiment specifically into the value of polystyrene standard.
(adhesive composition)
The adhesive composition of the present invention contains acrylic copolymers (A) more than 50 mass %, the acrylic compounds Copolymer (A) includes the construction unit of (methyl) alkyl acrylate (a1) for deriving from the alkyl with carbon number 1~20 (a1), and containing 3 moles of more than % construction unit (a2) from acrylic acid derivative (a2), the acrylic acid derives There is thing (a2) glass transition temperature of carboxyl and its homopolymer to be less than 80 DEG C.
If the content of the mentioned component (A) in adhesive composition is less than 50 mass %, resulting glue has been used The heat-resisting xanthochromia of the bonding sheet of mixture composite has the tendency of reduction, therefore not preferred.
The content of composition (A) in adhesive composition is more than 50 mass %, and resulting bonding has been used from improving From the viewpoint of the heat-resisting xanthochromia of the bonding sheet of agent composition, preferably 65~100 mass %, more preferably 70~100 matter % is measured, is further preferably 75~100 mass %, more preferably 85~100 mass % are still more preferably 95~100 matter Measure %.
It should be noted that the content of composition (A) is when meeting in the range of above range, adhesive combination of the invention Thing can also contain the resin component beyond composition (A).
In addition, from the viewpoint of it can show more high adherence, adhesive composition of the invention is preferably further , can also be as needed containing the other additives being normally fitted in adhesive composition containing crosslinking agent (B).
The glass transition temperature (Tg) of the adhesive composition of the present invention is preferably -70~-5 DEG C, and more preferably -43 ~-7 DEG C, more preferably -40~-9 DEG C, be still more preferably -35~-12 DEG C.The Tg of adhesive composition is -70 DEG C During the above, the adhesive of the modulus of elasticity with the degree that can keep shape can be formed by resulting adhesive composition Layer.On the other hand, when the Tg of adhesive composition is less than -5 DEG C, even if resulting adhesive composition is thin by adhesive phase Membranization, can also turn into the formation material of the adhesive phase of the bonding sheet with high adhesion.
It should be noted that in the present invention, the value of the glass transition temperature of adhesive composition is by embodiment Described in method determine value.In addition, the value of the glass transition temperature of adhesive composition can be by being suitably altered to The species of construction unit (a1) and (a2) content, monomer (a1) and (a2) in (A) is divided to be adjusted.
<Acrylic copolymer (A)>
Acrylic copolymer (A) used in the present invention includes the (first for deriving from the alkyl with carbon number 1~20 Base) alkyl acrylate (a1) (hereinafter referred to as " monomer (a1) ") construction unit (a1), and coming containing 3 moles of more than % Come from acrylic acid derivative (a2) (hereinafter referred to as " monomer (a2) ") construction unit (a2), acrylic acid derivative (a2) tool The glass transition temperature for having carboxyl and its homopolymer is less than 80 DEG C.
Can be random copolymer, embedding in addition, the copolymerization form for acrylic copolymer (A) is not particularly limited Any of section copolymer, graft copolymer.
Relative to 100 moles of % of entire infrastructure unit in acrylic copolymer used in the present invention (A), structure list The content of first (a2) is 3 moles of more than %.When the content of construction unit (a2) is less than 3 moles of %, by resulting adhesive group The adhesive phase of compound formation and the interaction of adherend are reduced, the bonding force reduction of bonding sheet, therefore not preferred.
Relative to 100 moles of % of entire infrastructure unit in acrylic copolymer (A), the content of construction unit (a2) is 3 moles of more than %, from the viewpoint of the cohesive of the adhesive composition obtained by raising, preferably 3~50 moles %, more Preferably 4~40 moles %, more preferably 5~30 moles %, are still more preferably 7~20 moles of %, further Preferably 12~20 moles %.
It should be noted that when the content of construction unit (a2) increases, the glass transition temperature of adhesive composition has The tendency increased.
On the other hand, acrylic compounds are adjusted and are total to from order to obtain that the adhesive composition of enough cohesives can be shown From the viewpoint of the glass transition temperature of polymers (A), relative to the entire infrastructure unit 100 in acrylic copolymer (A) Mole %, the content of construction unit (a1) is preferably 50~97 moles of %, more preferably 60~96 moles %, more preferably 70~95 moles of %, are still more preferably 80~93 moles of %, much further preferably from 80~88 moles of %.
It should be noted that in acrylic copolymer (A), in addition to construction unit (a1) and (a2), can also contain There is the construction unit (a3) from other monomers (a3).
The obtained bonding of adhesive composition is kept from the glass transition temperature of adjustment acrylic copolymer (A) From the viewpoint of the balance of property and cohesiveness, relative to 100 moles of % of entire infrastructure unit in acrylic copolymer (A), The content of construction unit (a3) is preferably 10 moles of below %, more preferably 5 moles below %, more preferably 1 mole % Hereinafter, it is still more preferably 0.1 mole of below %.
From the viewpoint of the cohesive of the adhesive composition obtained by raising, contain in acrylic copolymer (A) Construction unit (a1) and construction unit (a2) mol ratio (construction unit (a1)/construction unit (a2)) be preferably 50/50~ 97/3, more preferably 60/40~96/4, more preferably 70/30~95/5, it is still more preferably 80/20~93/7.
From the viewpoint of the cohesive of the adhesive composition obtained by raising, the weight of acrylic copolymer (A) is equal Molecular weight (Mw) is preferably 100,000~1,500,000, more preferably 120,000~1,000,000, more preferably 150,000~700,000, more enters one Step is preferably 170,000~400,000.When Mw is more than 100,000, the cohesion of the adhesive phase formed by resulting adhesive composition Power strengthens, and can show enough bonding forces.In addition, when Mw is less than 1,500,000, can prevent by resulting adhesive group The modulus of elasticity of the adhesive phase of compound formation is too high, so as to suppress the bonding force reduction of bonding sheet.
(monomer (a1))
Monomer (a1) is (methyl) alkyl acrylate of the alkyl with carbon number 1~20.
The carbon number for the alkyl that monomer (a1) has is 1~20, but from by adjusting acrylic copolymer (A) Glass transition temperature is come from the viewpoint of the cohesive of the adhesive composition obtained by improving, the carbon number of alkyl is preferred For 2~12, more preferably 3~10, more preferably 4~8.
As monomer (a1), it can enumerate for example：(methyl) methyl acrylate, (methyl) ethyl acrylate, (methyl) third Olefin(e) acid propyl ester, (methyl) butyl acrylate, (methyl) amyl acrylate, (methyl) Hexyl 2-propenoate, (methyl) acrylate Ester, (methyl) 2-EHA, (methyl) Isooctyl acrylate monomer, (methyl) decyl acrylate, (methyl) acrylic acid ten Dialkyl ester, (methyl) acrylic acid tetradecane base ester, (methyl) aliphatic acrylate, (methyl) octadecyl acrylate Deng.
These monomers (a1) may be used alone, can also be used in combination two or more.
Wherein, from the viewpoint of the cohesive of the adhesive composition obtained by raising, preferred (methyl) acrylic acid fourth Ester, more preferably butyl acrylate.
It should be noted that in the case of two or more monomers (a1) are applied in combination, preferably at least containing (methyl) propylene Acid butyl ester.
The ratio of (methyl) butyl acrylate in monomer (a1) is preferably 60~100 mass %, more preferably 75~100 Quality %, more preferably 90~100 mass %, are still more preferably 95~100 mass %.
(monomer (a2))
Monomer (a2) is the glass transition temperature of its homopolymer for less than 80 DEG C and the acrylic acid with carboxyl derives Thing.
When the Tg of the homopolymer of aforesaid propylene acid derivative is more than 80 DEG C, it is impossible to which fully improving has filming adhesive phase Bonding sheet bonding force, the filming adhesive phase formed by resulting adhesive composition.
The glass transition temperature of the homopolymer of acrylic acid derivative with carboxyl be less than 80 DEG C, from improve with by From the viewpoint of the bonding force of the bonding sheet of the filming adhesive phase of resulting adhesive composition formation, preferably 60 DEG C Hereinafter, more preferably less than 50 DEG C, more preferably less than 40 DEG C.
In addition, the lower limit for the glass transition temperature is not particularly limited, but the acrylic acid with carboxyl derives The glass transition temperature of the homopolymer of thing is preferably more than -70 DEG C, more preferably more than -50 DEG C.
It should be noted that in the present invention, the glass transition temperature of the homopolymer of the acrylic acid derivative with carboxyl The value of degree can be used described in such as " POLYMER HANDBOOK the 3rd edition " (John Wiley＆Sons, Inc. distribution) Value.
As monomer (a2), as long as the glass transition temperature of its homopolymer is within the above range and with carboxyl Acrylic acid derivative can just be used without particular limitation, can be used alone can also be applied in combination it is two or more.
But, as monomer (a2), there is the filming adhesive formed by resulting adhesive composition from improving From the viewpoint of the bonding force of the bonding sheet of layer, the compound shown in following formulas (1) is preferably comprised.
[chemical formula 3]
In above-mentioned formula (1), R1Hydrogen atom or methyl are represented, X represents the alkylidene or following formula optionally with substituent (2) group shown in.
In formula (1), as above-mentioned alkylidene, it can enumerate for example：Methylene, ethylidene, propylidene, butylidene, Asia Amyl group, hexylidene, heptamethylene, octamethylene etc..
It is used as the X in formula (1), the preferably group shown in the alkylidene of carbon number 1~8 or following formula (2), more preferably carbon Base shown in group shown in the alkylidene or following formula (2) of atomicity 1~3, further preferred ethylidene or following formula (2) Group.
[chemical formula 4]
In formula (2), Y1And Y2The optionally alkylidene with substituent is represented independently of one another, it is necessary to explanation, * The bonded portion of carboxyl side in bonded portion, * * expressions (1) is represented with * *.
, can be with the exemplified group of enumeration (1) as above-mentioned alkylidene in formula (2).
In formula (2), Y is used as1And Y2, the alkylidene of preferred carbon number 1~8, more preferably carbon number independently of one another 1~3 alkylidene, further preferred ethylidene.
It should be noted that the X in above-mentioned formula (1) is the Y in the situation and above-mentioned formula (2) of alkylidene1And Y2For Asia In the case of alkyl, these alkylidenes optionally have substituent.
As the substituent, it can enumerate for example：The halogen atoms such as fluorine atom, chlorine atom, bromine atoms, iodine atom；Methyl, second The carbon numbers such as base are 1~8 alkyl；The alkoxy of the carbon numbers such as methoxyl group, ethyoxyl 1~6；Nitro；Cyano group；Hydroxyl； Mercapto；Epoxy radicals；Glycidoxy；The cycloalkyl of the ring carbons numbers such as cyclopenta, cyclohexyl 3~18；Phenyl, naphthyl etc. The aryl of ring carbons number 6~18；Pyridine radicals, furyl, carbazyl etc. contain appointing in nitrogen-atoms, oxygen atom, sulphur atom The heterocyclic radical of meaning more than 1 and ring member nitrogen atoms number 5~18；Etc..
As monomer (a2), there is gluing for the filming adhesive phase formed by resulting adhesive composition from improving Close piece bonding force from the viewpoint of, in the compound shown in above-mentioned (1), preferably mono succinate (2- acrylyl oxy-ethyls) ester and At least one of acrylic acid 2- carboxyethyls.
Mono succinate (2- acrylyl oxy-ethyls) ester is that the X in above-mentioned formula (1) is group shown in above-mentioned formula (2) (in formula (2) Y1And Y2For ethylidene) compound, acrylic acid 2- carboxyethyls are the compounds that X in above-mentioned formula (1) is ethylidene.
As the ratio of the compound shown in the above-mentioned formula (1) in monomer (a2), preferably 60~100 mass % are more excellent Elect 75~100 mass %, more preferably 90~100 mass % as, be still more preferably 95~100 mass %.
(other monomers (a3))
In the range of the effect of the present invention is not damaged, acrylic copolymer (A) used in the present invention can also contain There is the construction unit (a3) from other monomers (a3) beyond demonomerization (a1) and (a2).
As monomer (a3), it can enumerate for example：(methyl) acrylate with cross-linking functional groups such as hydroxyl, amino Monomer；The vinyl esters such as vinyl acetate, propionate；The olefines such as ethene, propylene, isobutene；Vinyl chloride, inclined chloroethene The haloalkene hydro carbons such as alkene；The aromatic vinyl monomers such as styrene, methyl styrene, vinyltoluene；Butadiene, isoamyl two The diene-based monomers such as alkene, chlorobutadiene；Nitrile monomers such as (methyl) acrylonitrile etc..
These monomers (a3) may be used alone, can also be used in combination two or more.
(synthetic method of acrylic copolymer (A))
In the monomer mixture being made up of above-mentioned monomer component, solvent, polymerization initiator can be added as needed simultaneously By carrying out polymerisation come acrylic acid synthesizing analog copolymer (A).
As used solvent, it can enumerate for example：Ethyl acetate, toluene etc..It should be noted that can also be in nothing Polymerisation is carried out in the case of solvent.
As the polymerization initiator to be added, it can enumerate for example：Azodiisobutyronitrile, benzoyl peroxide etc..
Relative to the mass parts of monomer mixture 100, the addition of polymerization initiator is preferably 0.01~1 mass parts, more excellent Elect 0.1~0.5 mass parts as.
It is not particularly limited for polymerizing condition, but after preferably being deaerated with nitrogen, it polymerize 2 at a temperature of 50~90 DEG C~ 30 hours.
<Resin component beyond composition (A)>
In the adhesive composition of the present invention, the content of composition (A), can also when meeting in the range of above range Contain the resin component beyond composition (A).
As the resin component beyond composition (A), it can enumerate for example：It is polyurethane resin, acrylated polyurethane resin, poly- The polyurethane based resins such as urethane polyester resin, butyl rubber etc..
Wherein, from the viscous of bonding sheet of the raising with the filming adhesive phase formed by resulting adhesive composition From the viewpoint of with joint efforts, preferred polyurethane resin.
The weight average molecular weight (Mw) of polyurethane based resin is preferably 10,000~300,000, more preferably 30,000~250,000, further Preferably 50,000~200,000.
When Mw is more than 10,000, the adhesion characteristic of obtained adhesive composition, the tendency that particularly adhesion is improved. On the other hand, Mw be less than 300,000 when, can avoid resulting adhesive composition before matrix material etc. is coated on or The phenomenon of gelation occurs in coating process.
Relative to the resin component beyond composition (A), polyurethane based resin content is preferably 70~100 mass %, more excellent Elect 85~100 mass %, more preferably 95~100 mass % as.
From the viewpoint of heat-resisting xanthochromia is improved, the resin component beyond composition (A) in adhesive composition contains Preferably below 30 mass %, more preferably more preferably below 25 mass %, below 15 mass % are measured, it is further excellent Elect as below 5 mass %, much further preferably from below 1 mass %, particularly preferably 0 mass %.
<Crosslinking agent (B)>
From the viewpoint of it can show more high adherence, preferably also containing crosslinking in adhesive composition of the invention Agent (B).
As crosslinking agent, it can enumerate：Isocyanates crosslinking agent, epoxies crosslinking agent, aziridines crosslinking agent, metal Chelates crosslinking agent and amine cross-linking agent, amino resins class crosslinking agent etc..
Wherein, from the viscous of bonding sheet of the raising with the filming adhesive phase formed by resulting adhesive composition From the viewpoint of with joint efforts, preferred isocyanate class crosslinking agent.
It should be noted that these crosslinking agents may be used alone, can also be used in combination it is two or more.
As isocyanates crosslinking agent, it can enumerate for example：2,4 toluene diisocyanate, 2,6- toluene diisocynates Ester, 1,3- XDIs, 1,4- XDIs, the isocyanic acid of '-two of diphenyl-methane -4,4 Ester, diphenyl-methane -2,4 ' it is-diisocyanate, 3- Dimethyl diphenylmethanes diisocyanate, hexamethylene diisocyanate, different Isophorone diisocyanate, dicyclohexyl methyl hydride -4,4 '-diisocyanate, dicyclohexyl methyl hydride -2,4 '-diisocyanate, rely The polyisocyanate compounds such as propylhomoserin isocyanates.
It should be noted that polyisocyanate compound can also be the trimethylolpropane adduct type of above-claimed cpd Modified body, biuret type modified body, the isocyanurate type modified body containing chlorinated isocyanurates ring reacted with water.
As long as epoxies crosslinking agent has more than 2 epoxy radicals or glycidyl in the molecule, do not limit especially It is fixed, but the multi-functional epoxy compound preferably containing more than 2 epoxy radicals in 1 molecule.
As multi-functional epoxy compound, it can enumerate for example：The 2-glycidyl ester and its oligomer of bisphenol-A, hydrogenation The 2-glycidyl ester and its oligomer of bisphenol-A, o-phthalic acid diglycidyl ester, Diglycidyl M-phthalate, Terephthalic acid diglycidyl ester, P-hydroxybenzoic acid ethylene oxidic ester, tetrahydrophthalic acid 2-glycidyl ester, hexahydro O-phthalic acid diglycidyl ester, butanedioic acid 2-glycidyl ester, adipic acid 2-glycidyl ester, decanedioic acid 2-glycidyl Ester, ethylene glycol diglycidylether, propylene glycol diglycidylether, 1,4- butanediol diglycidyl ethers, 1,6-HD two Glycidol ether and PAG 2-glycidyl esters, trimellitic acid three-glycidyl ester, isocyanuric acid three shrink Glyceride, 1,4- diglycidyls phenol, diglycidyl propylene urea, glycerin triglycidyl ether, trihydroxy methyl third Alkane diglycidyl ether or trihydroxymethylpropanyltri diglycidyl ether, pentaerythrite diglycidyl ether or pentaerythrite three shrink Diglycidyl amine such as glycerin ether, triglycidyl ether, the diglycidylaniline of glycerol epoxy compound addition product etc..
As aziridines crosslinking agent, it can enumerate for example：1,1 '-(methylene two is to phenylene) double -3,3- aziridine Base urea, 1,1 '-hexamethylene bis (3,3- '-aziridinos) urea, the '-aziridino -1,3,5- triazines of 2,4,6- tri-, trimethylolpropane Three (2- '-aziridinos propionic esters) etc..
As metal-chelating species crosslinking agent, it can enumerate for example：Aluminium, iron, copper, zinc, tin, titanium, nickel, antimony, magnesium, vanadium, chromium, Compound of the coordination such as the polyvalent metals such as zirconium and acetylacetone,2,4-pentanedione, ethyl acetoacetate etc..
As amine cross-linking agent, it can enumerate for example：Polyamines；Trien, tetren, ethylenediamine, N, N- dicinnamylidene -1,6- hexamethylene diamines (N, N-Dicinnamylidene-1,6-hexanediamine), propane diamine, own diamino The aliphatic such as carbamate, monoethanolamine, oxa- -2- spiral shells [5.5] hendecanes of 3,9- bis- (3- aminopropyls) -2,4,8,10- four are more The salt of amine and these compounds；The fragrance such as diaminodiphenyl-methane, xylyene diamine, phenylenediamine, diaminodiphenylsulfone Race's polyamines etc..
As amino resins class crosslinking agent, it can enumerate for example：Methoxylation methylolurea, methoxylation methylol N, N- Ethylidene-urea, methoxylation methylol dicyandiamide, methoxylation melamine methylol, methoxylation methylolbenzoguanamine, Butoxylated melamine methylol, butoxylated methylolbenzoguanamine etc., preferably methoxylation melamine methylol, fourth Epoxide melamine methylol and methoxylation methylolbenzoguanamine etc..
It should be noted that these crosslinking agents may be used alone, can also be used in combination it is two or more.
From the bonding force for improving the bonding sheet with the filming adhesive phase formed by resulting adhesive composition From the viewpoint of, relative to the mass parts of resin component 100 contained in adhesive composition, the crosslinking agent in adhesive composition Content be preferably 0.01~8 mass parts, more preferably 0.05~5 mass parts, more preferably 0.1~3 mass parts.
<Other additives>
In the range of the effect of the present invention is not damaged, adhesive composition of the invention can also be containing generally in bonding The other additives added in agent composition.
As other additives, it can enumerate for example：Ultra-violet absorber, antioxidant, preservative, mould inhibitor, tackifier, Plasticizer, defoamer and Wetting-transition agent etc..
The content of other additives is preferably 0~10 mass % in adhesive composition, more preferably 0~5 mass %, is entered One step is preferably 0~1 mass %.
It should be noted that in the range of the effect of the present invention is not damaged, adhesive composition of the invention can contain There are tackifier, but from the viewpoint of heat-resisting xanthochromia is improved, preferably without tackifier.
Consider from above-mentioned viewpoint, the content of tackifier is preferably below 5 mass % more preferably 3 in adhesive composition Below quality %, more preferably below 1 mass %, more preferably below 0.1 mass %, are still more preferably 0 matter Measure %.
It should be noted that in the present invention, tackifier are to refer to mix with mentioned component (A) and above-mentioned other resins The oligomer model that the molecular weight for closing and having the function that can improve the bond properties of these resin components is 100~10000 The compound enclosed.
As specific tackifier, it can enumerate for example：Rosin, rosin phenolic resin and their ester compounds etc. The terpenoid resins such as rosin resinoid, terpene oligomers, terpene phenolic resin, aromatic modified terpenes, C5 through-stones oleoresin, C9 Through-stone oleoresin etc..
(bonding sheet)
The bonding sheet of the present invention has what the adhesive composition by the present invention was formed in the one or both sides of matrix material Adhesive phase.As the concrete structure of the bonding sheet of the present invention, can enumerate bonding sheet 1a described in Fig. 1 and 2,1b, 2a, 2b。
As the bonding sheet of the present invention, can enumerate has bonding as Fig. 1 (a) in the one side of matrix material 11 The bonding sheet 1a of the oxidant layer 12 and bonding sheet 1b further on adhesive phase 12 as Fig. 1 (b) with stripping film 13 Deng one side bonding sheet；Or there is adhesive phase 12a, 12b bonding as Fig. 2 (a) on the two sides of matrix material 11 Piece 2a and as Fig. 2 (b) on adhesive phase 12a, 12b further bonding sheet 2b etc. with stripping film 13a, 13b The structure of double-sided adhesive sheet.
Alternatively, it is also possible to being to implement lift-off processing on Fig. 2 (a) bonding sheet 2a adhesive phase superimposed layer two sides Stripping film after carry out the structure batched.
Further, it is also possible to be the bonding sheet without matrix material that adhesive phase is clamped by two stripping films.
In the present invention, be " by adhesive phase filming " instigate the thickness of each adhesive phase for less than 10.0 μm (preferably For less than 5.0 μm, more preferably less than 3.0 μm, more preferably less than 2.5 μm, be still more preferably less than 1.0 μm).
The bonding sheet of the present invention has the adhesive phase formed by the adhesive composition of the invention described above, therefore, even if Adhesive phase filming also had into excellent bonding force.
As the thickness of each adhesive phase, preferably more than 0.01 μm, more preferably more than 0.1 μm, it is further preferred For more than 0.2 μm, be still more preferably more than 0.3 μm, and preferably less than 10.0 μm, more preferably less than 5.0 μm, enter One step is preferably less than 3.0 μm, is still more preferably less than 2.5 μm, is particularly preferably less than 1.0 μm.The thickness of adhesive phase Spend for more than 0.01 μm when, enough bonding forces can be shown by the adhesive phase that is formed of adhesive composition of the present invention.
It is SUS304 steel plates in adherend as bonding force of the thickness of adhesive phase for 1 μm of bonding sheet of the present invention In the case of, when being determined according to the assay method described in embodiment, preferably more than 3.2N/25mm, more preferably 3.5N/ More than 25mm, more preferably more than 4.0N/25mm.
After the bonding sheet of the present invention is pasted on glass plate in the environment of 23 DEG C, 50%RH (relative humidity), at 120 DEG C The variable quantity (Δ YI) of yellow chromaticity after being stood 7 days under environment is preferably less than 1.0, and more preferably less than 0.8, further preferably It is still more preferably less than 0.3 for less than 0.5.
It should be noted that in the present invention, the value of the variable quantity (Δ YI) of above-mentioned yellow chromaticity is shown below.
The variable quantity (Δ YI) of the yellow chromaticity=(yellow chromaticity (YI of the bonding sheet after being stood 7 days in the environment of 120 DEG C Value))-(yellow chromaticity (YI values) of the bonding sheet at the initial stage before standing)
The YI values of bonding sheet refer to the value determined according to the method described in embodiment.
<Matrix material>
As matrix material 11 used in the bonding sheet of the present invention, it is not particularly limited, can be according to the use of bonding sheet The appropriate selection in way.
As specific matrix material, it can enumerate for example：Use knitting for the fibers such as artificial silk, acrylonitrile, polyester Thing or non-woven fabrics；The stationeries such as fine paper, glassine paper, dipping paper, coated paper；The metal foil of aluminium, copper etc.；It is polyurethane foaming body, poly- The foaming bodies such as ethene foaming body；Polyethylene terephthalate, polybutylene terephthalate (PBT), poly- naphthalenedicarboxylic acid ethylene glycol The polyester film of ester etc., polyurethane film, polyethylene film, polypropylene screen, polychloroethylene film, polyvinylidene chlorida film, polyvinyl alcohol film, second Alkene-vinyl acetate copolymer film, polystyrene film, polycarbonate membrane, acrylic resin film, norbornene resin film, ring The plastic foils such as olefin resin film；Their two or more laminated bodies etc..
Wherein, the viewpoint from the thickness and precision required along with filming, surface smoothness, the easy degree obtained is examined Consider, preferably the polyester film such as polyethylene terephthalate, polychloroethylene film.
The thickness of matrix material can suitably be selected according to the purposes of bonding sheet, but from the viewpoint of easily operated, it is excellent Elect 1~300 μm as, more preferably 2~200 μm, more preferably 4~100 μm, be still more preferably 6~50 μm.
<Stripping film>
As stripping film 13 used in the bonding sheet of the present invention, it is not particularly limited, from the viewpoint of easily operated, It is preferred that in stripping film of the stripping film with coating remover on matrix material.
Stripping film can be obtained from stripping film carries out lift-off processing with the two sided coatings remover of matrix material Stripping film or only carry out stripping film obtained from lift-off processing in the coated on one side remover of the matrix material.
As stripping film matrix material, it can enumerate for example：The paper matrix such as glassine paper, coated paper, cast-coated paper material, The laminated paper obtained from thermoplastic resin such as laminated polyethylene or polyethylene terephthalate on these paper matrix materials, Polyolefin films such as polyester film, polypropylene, the polyethylene of polybutylene terephthalate (PBT), PEN etc. etc. are moulded Expect film etc..
As remover, it can enumerate for example：The rubber such as olefine kind resin, isoprene resinoid, butadiene type resin Class elastomer, chain alkyl resinoid, alkyd based resin, fluorine-containing resinoid, polysiloxanes resinoid etc..
As the thickness of stripping film, it is not particularly limited, usually 20~200 μm, preferably 25~150 μm.
As the thickness of the layer formed by remover of the stripping film, it is not particularly limited, in remover with solution state In the case of coating, preferably 0.01~2.0 μm, more preferably 0.03~1.0 μm.
In addition, in the case where using plastic foil as stripping film matrix material, the thickness of the matrix material is preferably 3 ~50 μm, more preferably 5~40 μm.
[manufacture method of bonding sheet]
The manufacture method of the bonding sheet of the present invention is not particularly limited.
As the manufacture method of the bonding sheet 1a as shown in Fig. 1 (a), it can enumerate：This hair is coated with matrix material 11 Bright adhesive composition and the method for drying it and forming adhesive phase 12 to be manufactured；This hair is coated with stripping film Bright adhesive composition simultaneously makes it dry and form adhesive phase 12, then the adhesive phase 12 is fitted with matrix material 11, Method for obtaining removing stripping film after bonding sheet 1b being manufactured etc..
In addition, as the manufacture method of the bonding sheet 1b as shown in Fig. 1 (b), can enumerate：Manufacturing above-mentioned bonding sheet 1a Afterwards, the method manufactured in the superimposed layer stripping film 13 of adhesive phase 12；The adhesive group of the present invention is coated with stripping film Compound simultaneously makes it dry and form adhesive phase 12, then the adhesive phase 12 is fitted with matrix material 11 come the side manufactured Method etc..
As the manufacture method of the bonding sheet 1b shown in Fig. 2 (a), it can enumerate：It is coated with the one side of matrix material 11 The adhesive composition of the present invention simultaneously makes it dry and form adhesive phase 12a, then on another face of matrix material 11 The method for being identically formed adhesive phase 12b to be manufactured；Prepare 2 sheet materials that adhesive phase is provided with stripping film, will The adhesive phase of the sheet material fits with matrix material, method for obtaining removing stripping film after bonding sheet 2b being manufactured etc..
In addition, being the manufacture method of the bonding sheet 1b shown in Fig. 2 (b), it can enumerate：After above-mentioned bonding sheet 2a is manufactured, On adhesive phase 12a, 12b respectively lamination stripping film 13a, 13b come the method that is manufactured；Prepare 2 to set on stripping film There is a sheet material of adhesive phase, then the adhesive phase of the sheet material and matrix material fitted method for being manufactured etc..
As the method that adhesive phase is formed on matrix material or on stripping film, it is not particularly limited, in order that bonding The thickness of oxidant layer is thinning, the adhesive composition of the organic solvent diluting present invention is preferably used, with adhesive composition solution Form passes through method formed by known coating method.
As organic solvent used in dilution adhesive composition, it can enumerate for example：Toluene, ethyl acetate, first and second Ketone etc..
From the viewpoint of making coating good and improving operability, the solid component concentration of adhesive composition solution Preferably 3~50 mass %, more preferably 5~30 mass %, more preferably 7~20 mass %.
It should be noted that during the synthesis of resin such as composition (A) contained in adhesive composition, the resin after synthesis In the case of the state for being comprised in organic solvent, identical organic solvent diluting can be used, it is above-mentioned to make solid component concentration It is prepared by scope.
As coating method, it can enumerate for example：Spin-coating method, spraying process, stick coating method, scraper for coating method, rolling method, roller knife Method known to rubbing method, scraper plate rubbing method, die coating method, gravure coating process etc..
In addition, in order to prevent the residual of solvent and low boiling point component and coordinate crosslinking agent in adhesive composition In the case of carry out cross-linking reaction and show cohesive, preferably on matrix material, stripping film after coating adhesive composition Heated.
Embodiment
In the present embodiment, the weight average molecular weight (Mw) of each composition is the value determined by the following method.
<Weight average molecular weight (Mw)>
Surveyed under the following conditions using gel permeation chromatography device (TOSOH Co., Ltd's system, product name " HLC-8020 ") It is fixed, and use the value for being converted into polystyrene standard and determining.
(condition determination)
Chromatographic column：“TSK guard column HXL-H”“TSK gel GMHXL(×2)”“TSK gel G2000HXL " (being TOSOH Co., Ltd's system)
Column temperature：40℃
Eluting solvent：Tetrahydrofuran
Flow velocity：1.0mL/min
In addition, the glass transition temperature of the homopolymer of the monomer component used in the present embodiment is as follows.
Mono succinate (2- acrylyl oxy-ethyls) ester (2AOE)：-40℃
Acrylic acid 2- carboxyethyls (2CEA)：37℃
Acrylic acid (AAc)：106℃
Synthesis example 1
(synthesis of acrylic copolymer (A) -1)
The mass parts of butyl acrylate (BA) 91.8 as monomer (a1), the amber as monomer (a2) are added in the reactor Single (2- acrylyl oxy-ethyls) ester (2AOE) 8.2 mass parts (using molar ratio computing as BA/2AOE=95/5) of amber acid, it is used as solvent The mass parts of ethyl acetate 400, the mass parts of azodiisobutyronitrile 0.3 as polymerization initiator are simultaneously mixed.
Then, deaerated with nitrogen to carrying out 2 hours in the reactor, be to slowly warm up to after 60 DEG C, stir while using Carry out polymerisation within 24 hours, obtain the ethyl acetate for 200,000 acrylic copolymer (A) -1 containing weight average molecular weight Solution (solid component concentration：20 mass %).
Synthesis example 2
(synthesis of acrylic copolymer (A) -2)
The mass parts of butyl acrylate (BA) 84.2 as monomer (a1), the amber as monomer (a2) are added in the reactor Single (2- acrylyl oxy-ethyls) ester (2AOE) 15.8 mass parts (using molar ratio computing as BA/2AOE=90/10) of amber acid, it is used as solvent The mass parts of ethyl acetate 400, the mass parts of azodiisobutyronitrile 0.3 as polymerization initiator and mixed.
Then, polymerisation is carried out in the same manner as synthesis example 1, has been obtained containing the acrylic compounds that weight average molecular weight is 200,000 Ethyl acetate solution (the solid component concentration of copolymer (A) -2：20 mass %).
Synthesis example 3
(synthesis of acrylic copolymer (A) -3)
Mass parts of butyl acrylate (BA) 88.9 as monomer (a1), third as monomer (a2) are added in the reactor The mass parts of olefin(e) acid 2- carboxyethyls (2CEA) 11.1 (using molar ratio computing as BA/2CEA=90/10), it is used as the ethyl acetate of solvent 300 mass parts, the mass parts of azodiisobutyronitrile 0.3 as polymerization initiator are simultaneously mixed.
Then, polymerisation is carried out in the same manner as synthesis example 1, has been obtained containing the acrylic compounds that weight average molecular weight is 290,000 Ethyl acetate solution (the solid component concentration of copolymer (A) -3：25 mass %).
Synthesis example 4
(synthesis of acrylic copolymer (A) -4)
Mass parts of butyl acrylate (BA) 83.4 as monomer (a1), third as monomer (a2) are added in the reactor The mass parts of olefin(e) acid 2- carboxyethyls (2CEA) 16.6 (using molar ratio computing as BA/2CEA=85/15), it is used as the ethyl acetate of solvent 300 mass parts, the mass parts of azodiisobutyronitrile 0.3 as polymerization initiator are simultaneously mixed.
Then, deaerated with nitrogen to carrying out 2 hours in the reactor, be to slowly warm up to after 60 DEG C, stir while using Carry out polymerisation within 24 hours, obtain the ethyl acetate for 290,000 acrylic copolymer (A) -4 containing weight average molecular weight Solution (solid component concentration：25 mass %).
Synthesis example 5
(synthesis of acrylic copolymer (A) -5)
The mass parts of butyl acrylate (BA) 96.7 as monomer (a1), the amber as monomer (a2) are added in the reactor Single (2- acrylyl oxy-ethyls) ester (2AOE) 3.3 mass parts (using molar ratio computing as BA/2AOE=98/2) of amber acid, it is used as solvent The mass parts of ethyl acetate 300, the mass parts of azodiisobutyronitrile 0.3 as polymerization initiator are simultaneously mixed.
Then, polymerisation is carried out in the same manner as synthesis example 1, has been obtained containing the acrylic compounds that weight average molecular weight is 260,000 Ethyl acetate solution (the solid component concentration of copolymer (A) -5：25 mass %).
Synthesis example 6
(synthesis of acrylic copolymer (A) -6)
Mass parts of butyl acrylate (BA) 87.2 as monomer component, acrylic acid (AAc) 12.8 are added in the reactor Mass parts (using molar ratio computing as BA/AAc=85/15), as solvent the mass parts of ethyl acetate 300, be used as polymerization initiator The mass parts of azodiisobutyronitrile 0.3 and mixed.
Then, polymerisation is carried out in the same manner as synthesis example 1, has been obtained containing the acrylic compounds that weight average molecular weight is 300,000 Ethyl acetate solution (the solid component concentration of copolymer (A) -6：25 mass %).
Synthesis example 7
(synthesis of polyurethane resin (1))
Polypropylene glycol (the Mw as dihydric alcohol is added in the reactor：2000) 100 mass parts, be esterified as polyisocyanic acid The mass parts of hexamethylene diisocyanate 10.1 of compound, go forward side by side as the mass parts of dibutyl tin laurate 0.01 of catalyst Row mixing, the reactor is to slowly warm up to after 85 DEG C, is stirred 2 hours, has been obtained isocyanate terminated urethane prepolymer.
The mass parts of toluene 110 are added into obtained isocyanate terminated urethane prepolymer, (25 are slowly cooled to room temperature DEG C) after, the mass parts of BDO 0.48 and the mass parts of trimethylolpropane 0.12 as chain extender are added dropwise, it is slow to rise After warm to 70 DEG C, stir 2 hours, obtained the toluene solution (solid for 160,000 polyurethane resin (1) containing weight average molecular weight Constituent concentration：50 mass %).
Embodiment 1~10, comparative example 1~7
The acrylic copolymer that will be obtained in the synthesis example 1~6 of species shown by table 1 and use level (solid constituent ratio) The polyurethane tree obtained in the synthesis example 7 of use level (solid point ratio) shown by the solution of thing (A) any of -1~6, table 1 The solution of fat (1) and the isocyanates crosslinking agent (three as the use level (solid constituent ratio) shown in the table 1 of crosslinking agent The ethyl acetate solution of hydroxymethyl-propane modified toluene diisocyanate, the mass % of solid constituent 75, Japanese polyurethane industry strain Formula commercial firm system, trade name " Coronate L ") mixed, solid component concentration is diluted to ethyl acetate for 10 mass %, It is prepared for adhesive composition solution.
It should be noted that as shown in table 1, without acrylic copolymer is coordinated in comparative example 3, in addition, implementing In example 1~4 and comparative example 1~2, polyurethane resin (1) is not coordinated.
In 38 μm of polyester films (Lindeke Co., Ltd's systems, trade name of the process polysiloxanes processing as stripping film " SP-PET381031 ") on be coated with adhesive composition solution that this prepares and form coated film so that dried bonding The thickness of oxidant layer is 1 μm.Then, the coated film is dried 1 minute at 100 DEG C, forms the adhesive phase of 1 μm of thickness, it is viscous at this 25 μm of polyester films of mixture layer superimposed layer (Mitsubishi's polyester film Co. Ltd. system, trade name " T-100 "), have been obtained with Fig. 1's (b) Bonding sheet 1b structure identical bonding sheets.
Tests below is carried out for the adhesive composition or bonding sheet obtained as described above and is evaluated.Evaluation result is shown in Table 1.
(1) measure of the glass transition temperature (Tg) of adhesive composition
Determined using rheometer (PaarPhysica company systems, trade name " MCR300 "), under conditions of frequency 1Hz real The mechanical loss angle tangent tan δ of the adhesive composition prepared in example and comparative example temperature dependency is applied, by the peak of tan δ values Temperature during value as the adhesive composition glass transition temperature (Tg).
(2) measure of the bonding force of bonding sheet
The stripping film of test film is removed in the environment of 23 DEG C, 50%RH (relative humidity), by gluing that the test film exposes Mixture layer is pasted on adherend (SUS304 steel plates), has made test specimen, and the test film is by embodiment and comparative example The bonding sheet of middle making is cut into obtained from 25mm × 300mm.
Then, after the above-mentioned test specimen being fabricated to being stood into 24 hours in the environment of 23 DEG C, 50%RH, according to JIS Z0237：2000 regulation, the bonding force of bonding sheet is determined using 180 ° of stripping methods with 300mm/ points of draw speed.
(3) measure of the yellow chromaticity (YI) of bonding sheet
The stripping film of test film is removed in the environment of 23 DEG C, 50%RH (relative humidity), by gluing that the test film exposes Mixture layer is pasted on glass plate, has made test specimen, and the test film is the bonding sheet that will be made in embodiment and comparative example It is cut into obtained from 50mm × 50mm.
Then, using color computer light splitting color difference meter (electricity Se Industrial Co., Ltd of Japan system, Spectro Color Meter SQ 2000) to the yellow chromaticity and after in the environment of 120 DEG C standing 7 days at initial stage of the above-mentioned test specimen that is fabricated to The yellow chromaticity of test specimen be determined.It should be noted that front and rear test specimen will be stood under above-mentioned environment The difference of yellow chromaticity is set to Δ YI, and Δ YI value is also depicted in into table 1.
As shown in Table 1, even if the thickness of adhesive phase is 1 μm, the bonding sheet of embodiment 1~10 also has excellent bonding Power, and heat-resisting xanthochromia is excellent.
On the other hand, in terms of bonding force, result is that the bonding sheet of comparative example 1~3 is poorer than the bonding sheet of embodiment.And And, in terms of heat-resisting xanthochromia, result is that the bonding sheet of comparative example 3~7 is poorer than the bonding sheet of embodiment.
Industrial applicibility
Used the present invention adhesive composition bonding sheet even if by adhesive phase filming to less than 10.0 μm With high adhesion, and with excellent heat-resisting xanthochromia.Therefore, bonding sheet of the invention can be to portable electronic instrument Miniaturization and slimming are made contributions, and are preferably applied to the purposes such as electronic instrument, optical instrument.

Claims (11)

1. a kind of bonding sheet, it has the adhesive phase formed by adhesive composition in the one or both sides of matrix material, its In,
Described adhesive composition contains acrylic copolymers (A) more than 50 mass %,
The acrylic copolymer (A) includes (methyl) acrylic acid alkyl for deriving from the alkyl with carbon number 1~20 The construction unit (a1) of ester, and contain 3 moles of more than % construction unit (a2) from acrylic acid derivative, described third There is gadoleic acid derivative the glass transition temperature of carboxyl and its homopolymer to be less than 80 DEG C,
The weight average molecular weight of the acrylic copolymer (A) is 170,000~400,000,
The thickness of adhesive phase is 0.01~10.0 μm,
It is quiet in the environment of 120 DEG C after the bonding sheet is pasted on glass plate in the environment of 23 DEG C, 50%RH (relative humidity) The variable quantity (Δ YI) for putting the yellow chromaticity after 7 days is less than 1.0.
2. bonding sheet according to claim 1, wherein, acrylic acid derivative (a2) includes the change shown in following formulas (1) Compound,
In formula (1), R1Hydrogen atom or methyl are represented, X represents the base shown in alkylidene or following formula (2) optionally with substituent Group,
In formula (2), Y1And Y2Represent that optionally there is the alkylidene of substituent independently of one another, also, * and * * represent bonding part Point, the bonded portion of carboxyl side in * * expressions (1).
3. bonding sheet according to claim 1 or 2, wherein, acrylic acid derivative (a2) is mono succinate (2- acryloyl-oxies Ethyl) at least one of ester and acrylic acid 2- carboxyethyls.
4. bonding sheet according to claim 1 or 2, wherein, contained construction unit (a1) in acrylic copolymer (A) Mol ratio [construction unit (a1)/construction unit (a2)] with construction unit (a2) is 50/50~97/3.
5. bonding sheet according to claim 1 or 2, wherein, described adhesive composition also contains crosslinking agent (B).
6. bonding sheet according to claim 1 or 2, wherein, the content of contained tackifier in described adhesive composition For below 5 mass %.
7. bonding sheet according to claim 1 or 2, wherein, the glass transition temperature of described adhesive composition is -70 ~-5 DEG C.
8. bonding sheet according to claim 1 or 2, wherein, the thickness of described adhesive layer is more than 0.01 μm and 2.5 μm Below.
9. bonding sheet according to claim 1 or 2, wherein, the thickness of described adhesive layer be 1 μm, adherend be In the case of SUS304 steel plates, the bonding force of the bonding sheet is more than 3.2N/25mm.
10. bonding sheet according to claim 1 or 2, wherein, described adhesive composition also contains polyurethane resin.
11. bonding sheet according to claim 1 or 2, it is used for portable electronic instrument.
CN201710212454.9A 2012-10-19 2013-10-09 Adhesive composition and bonding sheet Pending CN107286856A (en)

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