WO2011083828A1 - 粘着剤組成物および粘着シート - Google Patents
粘着剤組成物および粘着シート Download PDFInfo
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- WO2011083828A1 WO2011083828A1 PCT/JP2011/050132 JP2011050132W WO2011083828A1 WO 2011083828 A1 WO2011083828 A1 WO 2011083828A1 JP 2011050132 W JP2011050132 W JP 2011050132W WO 2011083828 A1 WO2011083828 A1 WO 2011083828A1
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- sensitive adhesive
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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
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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
- C09J139/00—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 a single or double bond to nitrogen or by a heterocyclic ring containing nitrogen; Adhesives based on derivatives of such polymers
- C09J139/04—Homopolymers or copolymers of monomers containing heterocyclic rings having nitrogen as ring member
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- 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
- C08F226/00—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 a single or double bond to nitrogen or by a heterocyclic ring containing nitrogen
- C08F226/06—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 a single or double bond to nitrogen or by a heterocyclic ring containing nitrogen by a heterocyclic ring containing nitrogen
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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
- 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
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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
- 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
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- 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
- C08F220/1808—C8-(meth)acrylate, e.g. isooctyl (meth)acrylate or 2-ethylhexyl (meth)acrylate
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer
- Y10T428/2852—Adhesive compositions
- Y10T428/2878—Adhesive compositions including addition polymer from unsaturated monomer
- Y10T428/2891—Adhesive compositions including addition polymer from unsaturated monomer including addition polymer from alpha-beta unsaturated carboxylic acid [e.g., acrylic acid, methacrylic acid, etc.] Or derivative thereof
Definitions
- the present invention relates to an acrylic adhesive (also referred to as pressure-sensitive adhesive; the same applies hereinafter) agent composition and an adhesive sheet.
- an acrylic adhesive also referred to as pressure-sensitive adhesive; the same applies hereinafter
- an adhesive sheet an adhesive sheet.
- pressure-sensitive adhesive sheets have been used in various aspects such as fixing (joining), conveying, protecting, and decorating articles.
- a typical example of such a pressure-sensitive adhesive sheet includes a pressure-sensitive adhesive layer formed using an acrylic pressure-sensitive adhesive composition.
- Such an acrylic pressure-sensitive adhesive composition is typically configured such that a pressure-sensitive adhesive layer having an acrylic polymer as a base polymer can be formed.
- Patent Documents 1 to 8 are cited as prior art documents related to the acrylic pressure-sensitive adhesive composition.
- the adherend of the pressure-sensitive adhesive sheet can be made of materials having various surface polarities such as polypropylene resin and acrylic resin.
- an adhesive having an acrylic polymer containing acrylic acid in the monomer composition as a base polymer has an adhesive property and / or repulsion resistance (adhesive layer) for an adherend having a low polarity surface such as a polypropylene resin.
- adherend having a low polarity surface such as a polypropylene resin.
- the present invention provides an acrylic pressure-sensitive adhesive composition that is capable of forming a pressure-sensitive adhesive layer that is excellent in adhesion to adherends having various surface polarities and that can exhibit good repulsion resistance even in a humid heat environment.
- Another object is to provide a pressure-sensitive adhesive sheet having such a pressure-sensitive adhesive layer, and to provide a laminate in which such a pressure-sensitive adhesive layer is provided on a layer made of an optical material.
- the pressure-sensitive adhesive composition provided by the present invention includes at least a copolymerization reaction product of a monomer mixture.
- R 1 is a hydrogen atom or a methyl group
- R 2 is an alkyl group having 4 to 20 carbon atoms; including an alkyl (meth) acrylate represented by (Condition (a)).
- N-vinylcaprolactam is included as the monomer m2 (condition (b)).
- the total amount of the monomer m1 and the monomer m2 contained in the monomer mixture is 95% by mass or more of the total monomer components contained in the monomer mixture (condition (c)).
- the amount of the monomer m2 is 12 to 40% by mass of the total monomer components (condition (d)). That is, the amount of the monomer m1 in all the monomer components is 55 to 88% by mass.
- the copolymerization reaction product may be a complete polymerization product of the monomer mixture or a partial polymerization product.
- the completely polymerized product refers to a resultant product obtained by copolymerizing the monomer mixture almost completely (that is, substantially all of the monomer components).
- the partially polymerized product refers to a resultant product obtained by copolymerizing a part of the monomer mixture.
- the partial polymer is typically a polymer obtained by partially copolymerizing monomers contained in the monomer mixture (which may include a polymer having a relatively low degree of polymerization. For example, the weight average molecular weight Mw is approximately 1 ⁇ .
- the copolymerization reaction product may contain other components (polymerization initiator, solvent, dispersion medium, etc.) used in the copolymerization reaction in addition to the monomer and / or copolymer thereof.
- a pressure-sensitive adhesive composition since it contains a copolymerization reaction product of a monomer mixture containing the predetermined amount of the monomer m1 and the monomer m2, it has excellent adhesion to a low-polar surface and has a normal temperature environment (for example, room temperature, A pressure-sensitive adhesive layer capable of exhibiting good repulsion resistance not only in about RH 50%) but also in a humid heat environment can be formed.
- the pressure-sensitive adhesive layer can be formed, for example, by applying (coating) the above-mentioned pressure-sensitive adhesive composition on a substrate, and then appropriately performing a processing treatment as necessary to be cured.
- the pressure-sensitive adhesive composition contains a partial polymer of the monomer mixture as the copolymerization reaction product.
- the pressure-sensitive adhesive composition further contains a photopolymerization initiator and is substantially free of a solvent.
- Such an adhesive composition may have a viscosity that can be applied as it is.
- the pressure-sensitive adhesive layer is easily formed by simple curing treatment such as light (typically UV) irradiation after application to a substrate or the like. be able to.
- a solvent here refers to the compound which does not have copolymerizability with respect to the said monomer component, and is mainly used for the purpose of diluting the said copolymerization reaction material. That is, a monomer component that can also function as a solvent (unreacted monomer) is not included in the concept of a solvent here.
- substantially free of solvent means that the pressure-sensitive adhesive composition contains no solvent at all or the content thereof is 0.1% by mass or less in the pressure-sensitive adhesive composition.
- the pressure-sensitive adhesive composition further contains a crosslinking agent.
- a pressure-sensitive adhesive (which may be a pressure-sensitive adhesive layer of a pressure-sensitive adhesive sheet; the same shall apply hereinafter) capable of exhibiting better adhesion and repulsion resistance can be formed on a low-polar surface. .
- a glass transition temperature Tg of a copolymer that can be produced from the mixture is ⁇ 10 ° C. or less (typically about ⁇ It preferably has a monomer composition of 70 ° C. to ⁇ 10 ° C.).
- Tg of the copolymer a value calculated by the Fox equation from the mass fraction of each monomer component (m1, m2, etc.) and Tg (Kelvin; K) as a homopolymer is adopted. According to this pressure-sensitive adhesive composition, a pressure-sensitive adhesive layer with a better balance of pressure-sensitive adhesive performance can be formed.
- the monomer mixture further contains a nitrogen-containing monomer other than N-vinylcaprolactam as the monomer m3.
- a pressure-sensitive adhesive sheet comprising a pressure-sensitive adhesive layer formed from any pressure-sensitive adhesive composition disclosed herein.
- a pressure-sensitive adhesive sheet can exhibit excellent adhesion to members having various surface polarities, and can exhibit good repulsion resistance even in a wet and heat environment.
- the pressure-sensitive adhesive formed from the pressure-sensitive adhesive composition disclosed herein exhibits good adhesion even to a low-polar surface, for example, a low-polar base surface (bonding surface) is provided. It is suitable for an application in which an optical member having a liquid crystal cell is bonded. Therefore, according to this invention, a laminated body further provided with an optical member and the cured layer of one of the adhesive compositions disclosed here as an adhesive layer laminated
- the optical member has a low polarity surface at least on the side where the pressure-sensitive adhesive layer is provided.
- the optical member means a member having a desired light transmittance, and may be a single layer structure made of the same material or a multilayer structure made of a plurality of materials. Typically, it refers to various optical films such as polarizing films, retardation films, and laminates thereof.
- a method for producing an adhesive sheet comprises the following steps: (A) preparing a pressure-sensitive adhesive composition by subjecting a mixture of monomers to a copolymerization reaction; (B) applying the pressure-sensitive adhesive composition on a substrate; and (C) applying the curing treatment to the applied composition to form an adhesive layer; Is included.
- the monomer mixture is represented by the following formula (I): CH 2 ⁇ C (R 1 ) COOR 2 (wherein R 1 is a hydrogen atom or a methyl group, and R 2 is an alkyl having 4 to 20 carbon atoms).
- the total amount of these monomers m1 and m2 is 95% by mass or more of the total monomer components. At the same time, the amount of monomer m2 is in the range of 12-40% by weight of the total monomer component.
- the copolymerization reaction may be performed only in the initial stage where a large amount of unreacted monomer remains (that is, partially), or until the final stage where almost no unreacted monomer remains (that is, approximately) May be done completely). If necessary, removal or addition of a solvent, addition of a crosslinking agent, and the like may be performed.
- the curing treatment after application of the composition may be drying (heating), crosslinking, additional copolymerization reaction, aging, and the like. These processings may be only one kind or two or more kinds. Two or more types (for example, crosslinking and drying) may be performed simultaneously or in multiple stages.
- a treatment such as a heat treatment
- a treatment that is simply dried is also included in the curing treatment here. According to such a method, it is possible to efficiently produce a pressure-sensitive adhesive sheet that exhibits excellent adhesion to members having various surface polarities and is also excellent in repulsion resistance under humid and heat environments.
- FIG. 1 is a cross-sectional view schematically showing a configuration example of an adhesive sheet according to the present invention.
- FIG. 2 is a cross-sectional view schematically showing another configuration example of the pressure-sensitive adhesive sheet according to the present invention.
- FIG. 3 is a cross-sectional view schematically showing another configuration example of the pressure-sensitive adhesive sheet according to the present invention.
- FIG. 4 is a cross-sectional view schematically showing another configuration example of the pressure-sensitive adhesive sheet according to the present invention.
- FIG. 5 is a cross-sectional view schematically showing another configuration example of the pressure-sensitive adhesive sheet according to the present invention.
- FIG. 6 is a cross-sectional view schematically showing another configuration example of the pressure-sensitive adhesive sheet according to the present invention.
- the pressure-sensitive adhesive composition disclosed herein contains a copolymerization reaction product of a monomer mixture containing at least monomer m1 and monomer m2 as essential components.
- Monomer m1 is one or more alkyl (meth) acrylates represented by the following formula (I) ((meth) acrylic acid ester of alkyl alcohol).
- (meth) acrylic acid is a concept including acrylic acid and methacrylic acid.
- R 1 in the formula (I) is a hydrogen atom or a methyl group.
- R 2 in the formula (I) is an alkyl group having 4 to 20 carbon atoms. The alkyl group may be linear or branched.
- alkyl (meth) acrylate represented by the formula (I) include n-butyl (meth) acrylate, isobutyl (meth) acrylate, sec-butyl (meth) acrylate, t-butyl (meth) acrylate, pentyl (Meth) acrylate, isopentyl (meth) acrylate, hexyl (meth) acrylate, heptyl (meth) acrylate, n-octyl (meth) acrylate, isooctyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, nonyl (meth) acrylate , Isononyl (meth) acrylate, decyl (meth) acrylate, isodecyl (meth) acrylate, undecyl (meth) acrylate, dodecyl (meth) acrylate, tridecyl (me
- R 2 are carbon atoms 4-14 alkyl (meth) acrylate is preferably an alkyl group (hereinafter, such a range of carbon atoms may be represented as "C 4-14".), R 2 Alkyl (meth) acrylates in which is a C 4-10 alkyl group (eg, n-butyl group, 2-ethylhexyl group, etc.) are more preferred.
- R 2 in the above formula (I) is C 4-10 (more preferably C 4-8 ).
- alkyl (meth) acrylate is C 4-10 alkyl (more preferably C 4-8 ).
- the monomer mixture may be, for example, a composition containing butyl acrylate (BA) alone as the monomer m1, a composition containing 2-ethylhexyl acrylate (2EHA) alone, a composition containing two kinds of BA and 2EHA, and the like.
- the amount of monomer m1 contained in the monomer mixture (when two or more alkyl (meth) acrylates are contained, the total amount thereof) is the sum of monomer m1 and monomer m2 depending on the amount of monomer m2 described below. What is necessary is just to select suitably so that quantity may be 95 mass% or more of all the monomer components. That is, the content of the monomer m1 is about 55 to 88% by mass, preferably about 60 to 86% by mass, based on all monomer components. If the content of the monomer m1 is too smaller than the above range, the desired adhesive performance may not be realized.
- the composition of the monomer mixture typically corresponds generally to the copolymerization ratio (copolymerization composition) of a copolymer obtained by copolymerizing the mixture.
- the monomer mixture contains N-vinylcaprolactam (NVC) as monomer m2 in addition to monomer m1.
- NVC can function as a component that contributes to improving the cohesiveness of the pressure-sensitive adhesive by the interaction between the molecules.
- the amount of the monomer m2 contained in the monomer mixture is about 12 to 40% by mass, preferably 14 to 35% by mass of the total monomer components. If the amount of the monomer m2 is too small, the repulsion resistance tends to be insufficient. If the amount of the monomer m2 is too large, tack may be reduced, or adhesive properties in a low temperature environment may be impaired.
- the monomer mixture may contain the monomer m3 as an optional component.
- the monomer m3 may be one or more unsaturated monomers that do not correspond to the monomer m1 and the monomer m2.
- the unsaturated monomer refers to a monomer having an ethylenically unsaturated group such as a vinyl group, an allyl group, or a (meth) acryloyl group.
- an N-containing monomer other than NVC can be used.
- N-vinyl cyclic amides such as N-vinyl-2-pyrrolidone, N-vinyl-2-piperidone, N-vinyl-3-morpholinone; (meth) acrylamide; N-ethyl (meth) acrylamide, N -N-alkyl (meth) acrylamides such as n-butyl (meth) acrylamide and N-octyl (meth) acrylamide; N, N-dimethyl (meth) acrylamide, N, N-diethyl (meth) acrylamide, N, N- N, N such as dipropyl (meth) acrylamide, N, N-diisopropyl (meth) acrylamide, N, N-di (n-butyl) (meth) acrylamide, N, N-di (t-butyl) (meth) acryl
- N-containing monomers include maleimide monomers such as N-cyclohexylmaleimide and N-phenylmaleimide; N-methylitaconimide, N-ethylitaconimide, N-butylitaconimide, N-2-ethylhexylitaconimide, N -Itaconic imide monomers such as lauryl itaconimide, N-cyclohexyl itaconimide; N- (meth) acryloxymethylene succinimide, N- (meth) acryloyl-6-oxyhexamethylene succinimide, N- (meth) acryloyl-8- Examples thereof include succinimide monomers such as oxyhexamethylene succinimide; imide group-containing monomers.
- a particularly preferred N-containing monomer is N-vinyl-2-pyrrolidone.
- an alkyl (meth) acrylate in which R 2 in the above formula (I) is an alkyl group having 1 to 3 or 21 or more carbon atoms (the alkyl group may be alicyclic);
- (Meth) acrylates having aromatic hydrocarbon groups such as phenyl (meth) acrylate and benzyl (meth) acrylate; 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 3-hydroxypropyl (meth) ) Acrylate, 2-hydroxybutyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 6-hydroxyhexyl (meth) acrylate, 8-hydroxyoctyl (meth) acrylate, 10-hydroxydecyl (meth) acrylate, 12- Hydroxylauryl (meth) acrylate And various (meth) acrylates such as hydroxyl group-containing (meth) acrylates such as [4-
- the monomer m3 examples include vinyl ester monomers such as vinyl acetate and vinyl propionate, ethylenically unsaturated monocarboxylic acids such as acrylic acid, methacrylic acid, and crotonic acid; maleic anhydride, itaconic anhydride, and the like. And carboxyl group-containing monomers such as ethylenically unsaturated carboxylic acid anhydrides.
- the content of monomer m3 (the total content of two or more if included) is about 5% by mass or less of the total monomer components. Or you may use the monomer mixture which does not contain the monomer m3 substantially. When there is too much content of the monomer m3, desired adhesive performance (adhesion with respect to a low-polar surface, repulsion resistance, etc.) may not be implement
- the amount of the carboxyl group-containing monomer among these monomers m3 is 0.5% by mass or less.
- the composition which does not contain a carboxyl group-containing monomer substantially may be sufficient as the said monomer mixture.
- sufficient cohesiveness can be obtained by using the monomer m2 without using an ethylenically unsaturated carboxylic acid such as acrylic acid or methacrylic acid.
- the ability to omit the use of the ethylenically unsaturated carboxylic acid is advantageous from the viewpoint of improving the adhesive properties for low-polar surfaces.
- the monomer mixture in the technology disclosed herein is, for a copolymer having a monomer composition of the mixture as a copolymer composition, a mass fraction of each monomer and Tg (Kelvin; K) as a homopolymer (monopolymer). It is preferable to have a monomer composition in which the Tg (theoretical value) calculated from the Fox equation is about ⁇ 10 ° C. or less (typically about ⁇ 70 ° C. to ⁇ 10 ° C.), and about ⁇ 20 ° C. or less ( It is more preferable to have a monomer composition that is typically about -70 ° C to -20 ° C.
- the monomer composition (the types and mass fractions of the monomer m1, the monomer m2, and the monomer m3) may be adjusted so that Tg is in the above range.
- the Tg values of various homopolymers are described, for example, in “Adhesive Technology Handbook” of Nikkan Kogyo Shimbun, “Polymer Handbook” of Wiley-Interscience, etc. In this specification, the following values are adopted as Tg of homopolymers composed of the following monomers.
- the pressure-sensitive adhesive composition disclosed herein contains at least one copolymerization reaction product of a monomer mixture. Or you may contain 2 or more types of the copolymerization reaction material from which a monomer composition differs. When two or more kinds of copolymerization reactants are included, it is sufficient that the monomer composition of the mixture of all these copolymerization reactants satisfies the above conditions (a) to (d), and the monomer composition of each copolymerization reactant The above conditions (a) to (d) may or may not be satisfied. Typically, at least one copolymerization reactant satisfies the above conditions (a) to (d).
- Each of the two or more kinds of copolymerization reaction products may have a monomer composition satisfying the above conditions (a) to (d).
- the pressure-sensitive adhesive composition contains a copolymerization reaction product that does not satisfy at least one of the conditions (a) to (d)
- the proportion of the copolymerization reaction product is 60% by mass or less of the total copolymerization reaction product. It is preferable that
- the copolymerization method of the monomer mixture is not particularly limited, and various conventionally known polymerization methods can be appropriately employed.
- a polymerization method performed using a thermal polymerization initiator thermal polymerization such as solution polymerization, emulsion polymerization, bulk polymerization, etc.
- photopolymerization performed by irradiation with light such as ultraviolet rays
- radiation ⁇ Radiation polymerization carried out by generating radicals, cations, anions and the like by irradiation with high energy rays such as rays, ⁇ rays, etc.
- the mode of polymerization is not particularly limited, and a conventionally known monomer supply method, polymerization conditions (temperature, time, pressure, etc.) and use components other than the monomer (polymerization initiator, surfactant) can be selected as appropriate.
- a monomer supply method the entire monomer mixture may be supplied to the reaction vessel at one time (collective supply), or may be gradually dropped and supplied (continuous supply), or divided into several times to be predetermined. Each amount may be supplied (divided supply) every time.
- a part or all of the monomer mixture may be supplied as a solution dissolved in a solvent, or as a dispersion emulsified in water together with an appropriate emulsifier.
- one or more polymerization initiators can be appropriately selected from known or commonly used polymerization initiators depending on the polymerization method.
- thermal polymerization solution polymerization, emulsion polymerization, etc.
- the thermal polymerization can be preferably carried out at a temperature of, for example, about 20 to 100 ° C. (typically 40 to 80 ° C.).
- Various photopolymerization initiators can be used for photopolymerization.
- 2,2′-azobisisobutyronitrile AIBN
- 2,2′-azobis-2-methylbutyronitrile 2,2′-azobis (2-methylpropionic acid) Dimethyl, 4,4′-azobis-4-cyanovaleric acid, azobisisovaleronitrile
- 2,2′-azobis (2-amidinopropane) dihydrochloride 2,2′-azobis [2- (5-methyl- 2-imidazolin-2-yl) propane] dihydrochloride
- 2,2'-azobis (2-methylpropionamidine) disulfate 2,2'-azobis (N, N'-dimethyleneisobutylamidine) dihydrochloride, etc.
- AIBN 2,2′-azobisisobutyronitrile
- 2,2′-azobis-2-methylbutyronitrile 2,2′-azobis (2-methylpropionic acid) Dimethyl
- 4,4′-azobis-4-cyanovaleric acid azobisisovaleronitrile
- Peroxide initiators include persulfates such as potassium persulfate and ammonium persulfate; dibenzoyl peroxide, t-butyl permaleate, t-butyl hydroperoxide, di-t-butyl peroxide, t- Butyl peroxybenzoate, dicumyl peroxide, 1,1-bis (t-butylperoxy) -3,3,5-trimethylcyclohexane, 1,1-bis (t-butylperoxy) cyclododecane, hydrogen peroxide Etc. are exemplified.
- Redox initiators include a combination of peroxide and ascorbic acid (such as a combination of hydrogen peroxide and ascorbic acid), a combination of peroxide and iron (II) salt (hydrogen peroxide and iron ( II) Combinations with salts, etc.), combinations of persulfates with sodium hydrogen sulfite and the like.
- Examples of substituted ethane-based initiators include phenyl-substituted ethane.
- Photopolymerization initiators include ketal photopolymerization initiators, acetophenone photopolymerization initiators, benzoin ether photopolymerization initiators, acylphosphine oxide photopolymerization initiators, ⁇ -ketol photopolymerization initiators, aromatic sulfonyls Examples include chloride photopolymerization initiators, photoactive oxime photopolymerization initiators, benzoin photopolymerization initiators, benzyl photopolymerization initiators, benzophenone photopolymerization initiators, and thioxanthone photopolymerization initiators.
- ketal photopolymerization initiator examples include 2,2-dimethoxy-1,2-diphenylethane-1-one [for example, trade name “Irgacure 651” (product of Ciba Japan)] and the like.
- acetophenone photopolymerization initiator examples include 1-hydroxycyclohexyl phenyl ketone [for example, trade name “Irgacure 184” (product of Ciba Japan)], 2,2-diethoxyacetophenone, 2,2-dimethoxy- Examples include 2-phenylacetophenone, 4-phenoxydichloroacetophenone, and 4- (t-butyl) dichloroacetophenone.
- benzoin ether photopolymerization initiator include benzoin methyl ether, benzoin ethyl ether, benzoin propyl ether, benzoin isopropyl ether, benzoin isobutyl ether, and the like.
- acylphosphine oxide photopolymerization initiator for example, trade name “Lucirin TPO” (product of BASF) can be used.
- ⁇ -ketol photopolymerization initiator include 2-methyl-2-hydroxypropiophenone and 1- [4- (2-hydroxyethyl) phenyl] -2-methylpropan-1-one. It is done.
- aromatic sulfonyl chloride photopolymerization initiator include 2-naphthalenesulfonyl chloride.
- photoactive oxime photopolymerization initiator include 1-phenyl-1,1-propanedione-2- (o-ethoxycarbonyl) -oxime.
- benzoin photopolymerization initiator include benzoin.
- benzyl photopolymerization initiator include benzyl.
- benzophenone photopolymerization initiator examples include benzophenone, benzoylbenzoic acid, 3,3′-dimethyl-4-methoxybenzophenone, polyvinylbenzophenone, ⁇ -hydroxycyclohexyl phenyl ketone, and the like.
- thioxanthone photopolymerization initiator examples include thioxanthone, 2-chlorothioxanthone, 2-methylthioxanthone, 2,4-dimethylthioxanthone, isopropylthioxanthone, 2,4-diisopropylthioxanthone, dodecylthioxanthone, and the like.
- the amount of the polymerization initiator used may be a normal amount, and can be selected, for example, from the range of about 0.001 to 5 parts by mass, preferably about 0. The amount is from 01 to 2 parts by mass, more preferably from about 0.01 to 1 part by mass. If the amount of the polymerization initiator used is too much or too little, it may be difficult to obtain the desired adhesive performance.
- an emulsifier surfactant used for emulsion polymerization
- an anionic emulsifier a nonionic emulsifier, and the like
- Anionic emulsifiers include polyoxyethylene alkyl ether sodium sulfate, polyoxyethylene alkyl phenyl ether ammonium sulfate, polyoxyethylene alkyl phenyl ether sodium sulfate, sodium lauryl sulfate, ammonium lauryl sulfate, sodium dodecylbenzene sulfonate, polyoxyethylene alkyl sulfosuccinic acid Sodium and the like are exemplified.
- nonionic emulsifier examples include polyoxyethylene alkyl ether, polyoxyethylene alkylphenyl ether, polyoxyethylene fatty acid ester, polyoxyethylene polyoxypropylene block polymer, and the like.
- radical polymerization with a structure in which a radical polymerizable group (vinyl group, propenyl group, isopropenyl group, vinyl ether group (vinyloxy group), allyl ether group (allyloxy group), etc.) is introduced into these anionic or nonionic emulsifiers.
- a reactive emulsifier reactive emulsifier
- Such emulsifiers can be used alone or in combination of two or more.
- the amount of the emulsifier used (based on the solid content) may be appropriately selected. For example, about 0.2 to 10 parts by mass, preferably about 0.5 to 5 parts by mass with respect to 100 parts by mass of all monomer components. can do.
- the copolymerization reaction product contained in the pressure-sensitive adhesive composition disclosed herein is a result obtained by at least partially copolymerizing the monomer mixture, and may be a partial polymerization product or a complete polymerization product. There may be. That is, the polymerization rate (monomer conversion) of the monomer in the copolymerization reaction product is not particularly limited, and the pressure-sensitive adhesive composition may contain an unreacted monomer or may not contain substantially. Moreover, the other component (it can be a polymerization initiator, a solvent, a dispersion medium, etc.) used for the copolymerization reaction may be included. In addition to the said copolymerization reaction material, you may further add other components, such as a polymerization initiator, a solvent, and a dispersion medium, to the said adhesive composition.
- the polymerization rate of the copolymerization reaction product is determined by the following method. [Measurement of polymerization rate] A sample of about 0.5 g is taken from the copolymerization reaction product, and the mass W p1 is precisely weighed. Next, the sample is heated to 130 ° C. for 2 hours to volatilize unreacted monomers, and the mass W p2 of the sample remaining after the heating is precisely weighed. A polymerization rate is calculated
- equation. Polymerization rate (%) (W p2 / W p1 ) ⁇ 100
- the copolymerization reaction product may be a partial polymerization product having a polymerization rate of, for example, about 2 to 40% by mass, preferably about 5 to 25% by mass.
- the partial polymer may have a syrup shape in which a copolymer formed from a part of the monomer component and an unreacted monomer are mixed.
- such a partially polymerized product may be referred to as “monomer syrup”.
- the polymerization method for performing partial polymerization of the monomer mixture is not particularly limited, and various polymerization methods as described above can be adopted.
- the pressure-sensitive adhesive composition of such an embodiment is a composition capable of forming a pressure-sensitive adhesive by further curing (polymerization) (typically, subjecting it to a further copolymerization reaction to increase the polymerization rate to the same level as that of a completely polymerized product).
- the polymerization method for curing the composition is not particularly limited, and may be the same as or different from the polymerization method used for partial polymerization of the monomer mixture (polymerization method for preparing the composition). Good. Since the pressure-sensitive adhesive composition of this embodiment has a low polymerization rate and contains an unreacted monomer, it can have a viscosity that can be applied without being diluted with a solvent or a dispersion medium.
- the pressure-sensitive adhesive composition of such an embodiment can be cured by a polymerization method (such as photopolymerization or radiation polymerization) that does not require a solvent or a dispersion medium, whereby the composition is a suitable substrate (a release liner).
- the pressure-sensitive adhesive layer can be formed by simple curing treatment such as light irradiation or radiation irradiation. At this time, an appropriate crosslinking treatment or the like may be performed as necessary.
- the polymerization rate of the partial polymer is too high, the handleability of the composition may be impaired depending on the form of the pressure-sensitive adhesive composition. For example, when a solventless pressure-sensitive adhesive composition is used, the viscosity may be too high and coating at room temperature may be difficult. On the other hand, if the polymerization rate is too low, the properties of the pressure-sensitive adhesive obtained by curing the composition tend to become unstable, and the viscosity of the composition may be too low to make coating difficult.
- the solventless pressure-sensitive adhesive composition can be easily prepared, for example, by partially copolymerizing the monomer mixture by photopolymerization.
- a partial polymer obtained by the above photopolymerization is obtained.
- Corresponding products may be prepared. From the viewpoint of efficiency and simplicity, it is preferable to perform partial polymerization of the monomer mixture by photopolymerization.
- the viscosity can be adjusted by easily controlling the polymerization rate (monomer conversion rate) of the partial polymer by changing the amount of light irradiation.
- the obtained partial polymer already contains a photopolymerization initiator, it can be photocured as it is when the composition is further cured to form an adhesive. At this time, you may add a photoinitiator as needed.
- the photopolymerization initiator to be added may be the same as or different from the photopolymerization initiator used for the partial polymerization.
- the solventless pressure-sensitive adhesive composition prepared by a method other than photopolymerization can be made photocurable by adding a photopolymerization initiator.
- the pressure-sensitive adhesive composition disclosed herein includes a partial polymer of the monomer mixture and one or more photopolymerization initiators and is substantially free of a solvent.
- a photocurable solventless pressure-sensitive adhesive composition can be easily prepared by applying the composition to a suitable substrate (may be a release liner), and then curing the applied layer by light irradiation.
- An adhesive layer can be formed.
- it has the advantage that a thick adhesive layer can be formed easily. Since an organic solvent is not used, it is preferable in terms of environmental hygiene.
- the amount of the photopolymerization initiator used is not particularly limited, and for example, the amount of the general polymerization initiator described above can be appropriately employed.
- the usage-amount of a photoinitiator here says the total amount of the photoinitiator used in the manufacture process of an adhesive composition. Therefore, in a pressure-sensitive adhesive composition obtained by adding (post-adding) a photopolymerization initiator to a partial polymer obtained by photopolymerization, it indicates the total amount of the part used in the partial polymerization and the additional part.
- the copolymerization reaction product is a complete polymerization product having a polymerization rate measured by the above-described method of about 95% by mass or more, preferably about 99% by mass or more.
- a form solvent type (organic solvent solution), aqueous solution, emulsion in which the pressure-sensitive adhesive component is diluted (dissolved or dispersed) to an appropriate viscosity with a solvent (organic solvent, water, or a mixture thereof). And the like can be preferably applied to the pressure-sensitive adhesive composition.
- the pressure-sensitive adhesive composition in such a form is an embodiment containing a completely polymerized product, and after the composition is applied to a suitable substrate (may be a release liner), it is simply cured such as drying.
- a suitable substrate may be a release liner
- the pressure-sensitive adhesive layer can be formed by the treatment. At this time, an appropriate crosslinking treatment or the like may be performed as necessary.
- the solvent-type pressure-sensitive adhesive composition can be easily prepared, for example, by subjecting the monomer mixture to solution polymerization. According to the solution polymerization, a complete polymer can be efficiently formed. It can also be prepared by dissolving a copolymerization reaction product obtained by a polymerization method other than solution polymerization (typically corresponding to the complete polymerization product obtained by solution polymerization) in a suitable organic solvent. it can. From the viewpoint of efficiency, preparation by solution polymerization is preferred.
- An emulsion-like pressure-sensitive adhesive composition can be easily prepared, for example, by subjecting the monomer mixture to emulsion polymerization. According to emulsion polymerization, a complete polymer can be formed efficiently.
- a copolymerization reaction product obtained by a polymerization method other than emulsion polymerization (typically corresponding to the complete polymerization product obtained by emulsion polymerization) is converted into an appropriate emulsifier in an aqueous solvent (typically water). It can also be prepared by emulsifying in the presence. From the viewpoint of efficiency, preparation by emulsion polymerization is preferred.
- the pressure-sensitive adhesive composition disclosed herein further contains a cross-linking agent.
- a cross-linking agent By using a cross-linking agent, an appropriate cohesive force and adhesive force can be imparted to the adhesive layer formed from the composition.
- a crosslinking agent a conventionally well-known thing can be suitably selected in the field
- the cross-linking agent is preferably added (that is, post-added) after the copolymerization reaction (complete polymerization or partial polymerization) of the monomer mixture.
- the amount of the crosslinking agent blended in the pressure-sensitive adhesive composition can be, for example, about 0.001 to 5 parts by mass with respect to 100 parts by mass of all monomer components.
- the amount is preferably about 0.01 to 3 parts by mass, and more preferably about 0.05 to 0.5 parts by mass. If the amount of the crosslinking agent is too small, a sufficient crosslinking effect cannot be exhibited, and the cohesive force (holding property) tends to be lowered. On the other hand, if the amount of the crosslinking agent is too large, the elastic modulus of the pressure-sensitive adhesive after curing becomes too high, and the adhesive force and tack may be easily lowered.
- the cross-linking agent is polyfunctional (
- a (meth) acrylate that is, a monomer having two or more (meth) acryloyl groups in one molecule
- a (meth) acrylate that is, a monomer having two or more (meth) acryloyl groups in one molecule
- polyfunctional acrylate From the viewpoint of polymerization reactivity (crosslinking reactivity) and the like, it is more preferable to use a polyfunctional acrylate.
- a polyfunctional acrylate In a preferred embodiment, only one or more (typically one) polyfunctional (meth) acrylates are used as the crosslinking agent. Or you may use together such polyfunctional (meth) acrylate and another crosslinking agent (for example, isocyanate type crosslinking agent) in the range by which the effect of this invention is not impaired remarkably.
- the amount of polyfunctional (meth) acrylate used is appropriately selected within the above range, for example, when difunctional (meth) acrylate is used, more when trifunctional (meth) acrylate is used. That's fine.
- an isocyanate-based crosslinking agent In the embodiment where the copolymerization reaction product is a complete polymerization product, an isocyanate-based crosslinking agent, an epoxy-based crosslinking agent, or the like can be preferably used.
- Particularly preferred crosslinking agents include isocyanate-based crosslinking agents.
- only one or more (typically one) isocyanate-based crosslinking agent is used as the crosslinking agent.
- isocyanate crosslinking agent examples include 1,6-hexamethylene diisocyanate, 1,4-tetramethylene diisocyanate, 2-methyl-1,5-pentane diisocyanate, 3-methyl-1,5-pentane diisocyanate, lysine diisocyanate, and the like.
- Aliphatic polyisocyanates such as isophorone diisocyanate, cyclohexyl diisocyanate, hydrogenated tolylene diisocyanate, hydrogenated xylene diisocyanate, hydrogenated diphenylmethane diisocyanate, hydrogenated tetramethylxylene diisocyanate; 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 4,4′-diphenylmethane diisocyanate, 2,4′-diphenylmethane diisocyanate, , 4′-diphenyl ether diisocyanate, 2-nitrodiphenyl-4,4′-diisocyanate, 2,2′-diphenylpropane-4,4′-diisocyanate, 3,3′-dimethyldiphenylmethane-4,4′-diisocyanate, 4, , 4'-diphenylpropane diisocyanate, m-phenylene
- Dimers and trimers, reaction products or polymers of these isocyanate compounds for example, diphenylmethane diisocyanate dimers and trimers, reaction products of trimethylolpropane and tolylene diisocyanate, trimethylolpropane and A reaction product with hexamethylene diisocyanate, polymethylene polyphenyl isocyanate, polyether polyisocyanate, polyester polyisocyanate) or the like can also be used.
- a reaction product of trimethylolpropane and tolylene diisocyanate can be preferably used.
- the pressure-sensitive adhesive layer provided in the pressure-sensitive adhesive sheet disclosed herein preferably has a gel fraction fg of, for example, about 20 to 90%.
- the conditions such as the conditions for forming the pressure-sensitive adhesive layer (drying conditions, light irradiation conditions, etc.), the type and amount of the crosslinking agent, and the like may be appropriately set. If the gel fraction of the pressure-sensitive adhesive is too low, the cohesive force tends to be insufficient.
- the “gel fraction fg of the pressure-sensitive adhesive” refers to a value measured by the following method. The gel fraction can be grasped as a mass ratio of an ethyl acetate insoluble component in the pressure-sensitive adhesive.
- the gel fraction fg of the pressure-sensitive adhesive can be obtained by substituting each value into the following formula.
- fg (%) [(W g4 ⁇ W g2 ⁇ W g3 ) / W g1 ] ⁇ 100
- PTFE porous polytetrafluoroethylene
- NTF1122 As the porous polytetrafluoroethylene (PTFE) membrane, a trade name “Nitoflon (registered trademark) NTF1122” available from Nitto Denko Corporation (average pore diameter 0.2 ⁇ m, porosity 75%, thickness 85 ⁇ m) Or it is desirable to use the equivalent.
- a chain transfer agent (which can also be grasped as a molecular weight regulator or a polymerization degree regulator) can be used as necessary.
- the chain transfer agent one or more known or conventional chain transfer agents can be used.
- the amount of chain transfer agent used may be the same amount as usual. For example, it can be selected from a range of about 0.001 to 0.5 parts by mass with respect to 100 parts by mass of all monomer components. .
- the pressure-sensitive adhesive composition disclosed herein may contain various additives that are common in the field of pressure-sensitive adhesive compositions as optional components.
- optional components include tackifiers (rosin resins, petroleum resins, terpene resins, phenol resins, ketone resins, etc.), plasticizers, softeners, fillers, colorants (pigments, dyes, etc.), Examples include antioxidants, leveling agents, stabilizers, preservatives, and the like.
- Conventionally known additives can be used as such additives.
- the pressure-sensitive adhesive composition does not substantially contain a tackifier.
- sufficient adhesion and repulsion resistance to various members can be obtained without using a tackifier by using the monomer m2.
- the ability to omit the use of a tackifier is advantageous from the viewpoint of improving heat resistance.
- the use of a solvent for dissolving the tackifier can be omitted, it is particularly advantageous in the case of a form (solvent-free type) that can be applied without dilution with a solvent.
- the pressure-sensitive adhesive composition disclosed herein is a final copolymer of the above monomer mixture contained in a pressure-sensitive adhesive formed by a curing treatment (drying, crosslinking, polymerization, etc.) as necessary (acrylic contained in a complete polymer). Is equivalent to about 50% by mass or more, more preferably about 70% by mass or more, and still more preferably 90% by mass or more. Such an adhesive composition can form an adhesive having better adhesive performance.
- the pressure-sensitive adhesive sheet according to the present invention includes a pressure-sensitive adhesive layer formed using any pressure-sensitive adhesive composition disclosed herein.
- a pressure-sensitive adhesive sheet (so-called pressure-sensitive adhesive sheet with a base material) in a form in which such a pressure-sensitive adhesive layer is fixedly provided on one or both sides of a sheet-like base material (support) (without the intention of separating the pressure-sensitive adhesive layer from the base material)
- the pressure-sensitive adhesive layer may be provided on a substrate having releasability such as a release liner (release paper, a resin sheet having a surface subjected to a release treatment) (for example, the pressure-sensitive adhesive layer at the time of application).
- It may be a pressure-sensitive adhesive sheet (so-called substrate-less pressure-sensitive adhesive sheet) in a form in which the base material to be supported is removed as a release liner.
- the concept of the pressure-sensitive adhesive sheet herein may include what are called pressure-sensitive adhesive tapes, pressure-sensitive adhesive labels, pressure-sensitive adhesive films and the like.
- the said adhesive layer is not limited to what was formed continuously, For example, the adhesive layer formed in regular or random patterns, such as a dot shape and stripe shape, may be sufficient.
- FIG. 1 is a structural example of the adhesive sheet with a base material of a double-sided adhesive property (double-sided adhesive sheet with a base material).
- the pressure-sensitive adhesive sheet 11 shown in FIG. 1 is provided with a pressure-sensitive adhesive layer 2 on both surfaces of a substrate 1, and these pressure-sensitive adhesive layers 2 are each protected by a release liner 3 having at least a pressure-sensitive adhesive layer side. It has a configuration.
- This type of pressure-sensitive adhesive sheet 12 has a configuration in which the pressure-sensitive adhesive sheet 12 is wound to bring the other pressure-sensitive adhesive layer into contact with the back surface of the release liner 3, and the other pressure-sensitive adhesive layer is also protected by the release liner 3. It can be.
- the pressure-sensitive adhesive sheet 13 shown in FIG. 3 has a configuration in which both surfaces of the base material-less pressure-sensitive adhesive layer 2 are respectively protected by a release liner 3 having at least a pressure-sensitive adhesive layer side.
- the pressure-sensitive adhesive sheet 14 shown in FIG. 4 has a configuration in which one surface of the base material-less pressure-sensitive adhesive layer 2 is protected by a release liner 3 whose both surfaces are release surfaces, and when this is wound, the pressure-sensitive adhesive layer 2 The other surface is in contact with the release liner 3 so that the other surface is also protected by the release liner 3.
- the pressure-sensitive adhesive sheet 15 shown in FIG. 5 is provided with a pressure-sensitive adhesive layer 2 on one side of a substrate 1, and the release liner is such that the surface (adhesive surface) of the pressure-sensitive adhesive layer 2 is at least the pressure-sensitive adhesive layer side. 3 is protected.
- the adhesive sheet 16 shown in FIG. 6 has a configuration in which the adhesive layer 2 is provided on one surface of the substrate 1.
- the other surface of the substrate 1 is a release surface, and when the pressure-sensitive adhesive sheet 16 is wound, the pressure-sensitive adhesive layer 2 comes into contact with the other surface, and the surface (adhesive surface) of the pressure-sensitive adhesive layer is the other surface of the substrate 1. It can be configured to be protected by the surface.
- the substrate examples include plastic films such as polypropylene film, ethylene-propylene copolymer film, polyester film, and polyvinyl chloride film; foam substrates such as polyurethane foam and polyethylene foam; kraft paper, crepe paper, Japanese paper, etc. Paper, cotton cloth, soft cloth, etc .; polyester nonwoven fabric, vinylon nonwoven fabric, etc .; aluminum foil, copper foil, etc. metal foil; etc. can be appropriately selected and used according to the application of the pressure-sensitive adhesive sheet.
- plastic film any of an unstretched film and a stretched (uniaxially stretched or biaxially stretched) film can be used.
- the surface of the substrate on which the pressure-sensitive adhesive layer is provided may be subjected to surface treatment such as application of a primer and corona discharge treatment.
- the thickness of the substrate can be appropriately selected according to the purpose, but is generally about 10 ⁇ m to 500 ⁇ m (typically 10 ⁇ m to 200 ⁇ m).
- the pressure-sensitive adhesive layer may be a cured layer of any pressure-sensitive adhesive composition disclosed herein. That is, the pressure-sensitive adhesive layer is preferably formed by applying (typically applying) the pressure-sensitive adhesive composition to a suitable substrate (which may be a release liner) and then appropriately performing a curing treatment. Can be done. When performing 2 or more types of hardening processes (drying, bridge
- a photocurable adhesive composition For example, if it is a photocurable adhesive composition, light irradiation is performed. If necessary, a curing treatment such as cross-linking and drying may be performed. For example, when it is necessary to dry with a photocurable adhesive composition, it is good to perform photocuring after drying. In the pressure-sensitive adhesive composition using a completely polymerized product, typically, as the curing treatment, treatments such as drying (heat drying) and crosslinking are performed as necessary.
- the pressure-sensitive adhesive composition can be applied using a conventional coater such as a gravure roll coater, a reverse roll coater, a kiss roll coater, a dip roll coater, a bar coater, a knife coater, or a spray coater. From the viewpoint of promoting the crosslinking reaction and improving the production efficiency, the pressure-sensitive adhesive composition is preferably dried under heating. Although depending on the type of support to which the composition is applied, for example, a drying temperature of about 40 to 150 ° C. can be employed. In the case of a pressure-sensitive adhesive sheet with a substrate, the pressure-sensitive adhesive composition may be directly applied to the substrate to form a pressure-sensitive adhesive layer, or the pressure-sensitive adhesive layer formed on the release liner may be transferred to the substrate. .
- a conventional coater such as a gravure roll coater, a reverse roll coater, a kiss roll coater, a dip roll coater, a bar coater, a knife coater, or a spray coater.
- the thickness of the pressure-sensitive adhesive layer is not particularly limited, but usually a good pressure-sensitive adhesive performance (for example, adhesive strength) can be realized by setting the thickness to, for example, about 10 ⁇ m or more, preferably about 20 ⁇ m or more, more preferably about 30 ⁇ m or more. For example, it is appropriate that the thickness of the pressure-sensitive adhesive layer is about 10 to 250 ⁇ m.
- the pressure-sensitive adhesive sheet disclosed herein has a peel strength at room temperature (23 ° C.) measured in the adhesive strength test described in the examples, such as a polypropylene (PP) plate, an acrylic plate, and an acrylonitrile-butadiene-styrene copolymer. It is 10 N / 25 mm or more for any united resin (ABS) plate, and can exhibit excellent adhesion to members having various surface polarities. Furthermore, the floating distance from the PP plate measured in the repulsion resistance test described in the examples is 5 mm or less in the room temperature environment, and the floating distance from the acrylic plate is 5 mm in both the room temperature environment and the wet heat environment. The following excellent repulsion resistance (curved surface followability) can be realized simultaneously.
- a peel strength at room temperature (23 ° C.) measured in the adhesive strength test described in the examples such as a polypropylene (PP) plate, an acrylic plate, and an acrylonitrile-butadiene-styrene copolymer
- Such an adhesive sheet is mainly composed of various resins such as PP, ABS, SBS (styrene-butadiene-styrene block copolymer), PC (polycarbonate) and the like and covers the surface of automobiles, housing materials, home appliances and the like. It is suitable for applications in which various members are joined (fixed) to the membrane.
- the pressure-sensitive adhesive formed from the pressure-sensitive adhesive composition disclosed herein has high adhesion to low-polar surfaces and also has heat and moisture resistance, so that an optical member having a base surface (bonding surface) with low polarity is attached.
- a body for example, a liquid crystal cell. Therefore, the technique disclosed here includes a laminate in which such an adhesive layer is provided on an optical member layer. This laminate typically has an aspect in which the pressure-sensitive adhesive layer on the optical member layer is protected by a release liner. Such an adhesive optical member can be easily attached to the surface of a liquid crystal cell, for example.
- the optical member is not particularly limited, and may be a polarizing film, a retardation film, or the like. These optical members have a low polarity surface at least on the side where the pressure-sensitive adhesive layer is laminated. That is, at least the layer forming the bonding surface is made of a low polarity material.
- the low polarity material may be various resins such as PP, PC, norbornene, polyethylene, polystyrene, AES (acrylonitrile-ethylene-styrene copolymer), ABS and the like.
- the optical member may have a single-phase structure made of the same material or a multilayer structure made of a plurality of materials.
- the above-described direct application method and transfer method can be appropriately employed as in the case of forming the pressure-sensitive adhesive layer on the substrate.
- the pressure-sensitive adhesive layer formed on the release liner is transferred to the base surface of the optical member.
- Example 1 2,100-monomer mixture consisting of 80 parts of 2EHA and 20 parts of NVC, 2,2-dimethoxy-1,2-diphenylethane-1-one (product of Ciba Japan, trade name “Irgacure 651”) 0 as a photopolymerization initiator 0.05 part and 0.05 part of 1-hydroxy-cyclohexyl-phenyl ketone (Ciba Japan, product name “Irgacure 184”) were added. The mixture was stirred under a nitrogen gas atmosphere to sufficiently remove dissolved oxygen, and then the mixture was irradiated with ultraviolet rays to obtain a partially polymerized monomer mixture (polymerization rate: 10.2%).
- HDDA 1,6-hexanediol diacrylate
- a polyethylene phthalate (PET) film having a thickness of 38 ⁇ m in which the surface in contact with the pressure-sensitive adhesive layer was subjected to release treatment with a silicone release agent was used as the release liner.
- the gel fraction of the pressure-sensitive adhesive after curing was 55.2%.
- Example 2 A double-sided PSA sheet was obtained in the same manner as in Example 1 except that the composition of the monomer mixture was 2EHA 70 parts / NVC 30 parts. The polymerization rate of the partially polymerized product was 11.8%. The gel fraction of the pressure-sensitive adhesive after curing was 69.0%.
- Example 3 A partial polymer having a polymerization rate of 8.9% was obtained in the same manner as in Example 1 except that the composition of the monomer mixture was changed to 2EHA 80 parts / NVC 16 parts / NVP 4 parts.
- Example 1 except that 0.018 part of HDDA was added to this partially polymerized product, and 0.05 parts of trade names “Irgacure 651” and “Irgacure 184” were added as photopolymerization initiators (additional amount).
- a double-sided PSA sheet was obtained.
- the gel fraction of the pressure-sensitive adhesive after curing was 50.0%.
- Example 4 A double-sided PSA sheet was obtained in the same manner as in Example 1 except that the composition of the monomer mixture was 80 parts BA / 20 parts NVC. The polymerization rate of the partially polymerized product was about 10%. The gel fraction of the pressure-sensitive adhesive after curing was 40.7%.
- Example 7 A double-sided PSA sheet was obtained in the same manner as in Example 1 except that the composition of the monomer mixture was 2EHA 90 parts / NVC 10 parts and the amount of HDDA was 0.045 parts. The polymerization rate of the partially polymerized product was about 10%. The gel fraction of the pressure-sensitive adhesive after curing was 63.1%.
- Example 8 A double-sided PSA sheet was obtained in the same manner as in Example 1 except that the composition of the monomer mixture was 2EHA 80 parts / NVP 20 parts. The polymerization rate of the partially polymerized product was 13.5%. The gel fraction of the pressure-sensitive adhesive after curing was 57.7%.
- Example 9 A double-sided PSA sheet was obtained in the same manner as in Example 3 except that the composition of the monomer mixture was 2EHA 70 parts / DEAA 30 parts and the amount of HDDA was 0.08 parts. The polymerization rate of the partially polymerized product was 11.2%. The gel fraction of the pressure-sensitive adhesive after curing was 49.0%.
- Example 10 A double-sided PSA sheet was obtained in the same manner as in Example 1 except that the composition of the monomer mixture was 2EHA 90 parts / AA 10 parts and the amount of HDDA was 0.04 parts. The polymerization rate of the partially polymerized product was about 9.0%. The gel fraction of the pressure-sensitive adhesive after curing was 69.7%.
- Table 1 shows the monomer composition, fg, and Tg of each example.
- Table 2 shows the results of the following evaluation tests performed on the pressure-sensitive adhesive sheets of Examples 1 to 10.
- Adhesive strength A 50 ⁇ m-thick PET film (without release treatment) was bonded to the first adhesive surface exposed by peeling off the first release liner from each adhesive sheet. This was cut into a width of 25 mm to prepare a test piece. The second release liner was peeled off from this test piece, and it was pressure-bonded to the adherend by a method in which a 5 kg roller was rotated once. As the adherend, a clean PP plate cleaned by rubbing 10 times with a clean waste impregnated with isopropyl alcohol was used. After holding this at 40 ° C.
- the pressure-sensitive adhesives of Examples 1 to 5 using a monomer mixture containing a total of 95% by mass of monomer m1 and monomer m2 (NVC) and 12 to 40% by mass of NVC are PP, Both showed excellent adhesiveness of 10 N / 25 mm or more for various resin materials such as acrylic and ABS. Further, the pressure-sensitive adhesives of Examples 1 to 5 exhibited good repulsion resistance in both room temperature environment and wet heat environment.
- the pressure-sensitive adhesives of Examples 6 and 7 using NVC of less than 12% by weight, and the pressure-sensitive adhesives of Examples 8 and 9 using other N-containing monomers instead of the NVC of Examples 1 and 2 are PP, acrylic Although the adhesiveness was sufficient with respect to various resin materials of ABS, repulsion resistance was apt to be insufficient even in a room temperature environment. Further, the pressure-sensitive adhesive of Example 10 using acrylic acid in addition to the monomer m1 had low adhesion to a low-polar PP plate, and was not sufficiently repulsive in a wet heat environment.
- the pressure-sensitive adhesive composition of the present invention is capable of forming a pressure-sensitive adhesive layer that is excellent in adhesion to adherends having various surface polarities and can exhibit good repulsion resistance.
- the pressure-sensitive adhesive sheet provided with can be suitably used for the purpose of fixing the optical member to a predetermined site.
- Base material 2 Adhesive layer 3: Release liner 11, 12, 13, 14, 15, 16: Adhesive sheet
Abstract
Description
CH2=C(R1)COOR2 (I)
ここで、R1は水素原子またはメチル基であり、R2は炭素数4~20のアルキル基である;で表されるアルキル(メタ)アクリレートを含む(条件(a))。また、モノマーm2として、N-ビニルカプロラクタムを含む(条件(b))。上記モノマー混合物に含まれるモノマーm1およびモノマーm2の合計量は、上記モノマー混合物に含まれる全モノマー成分の95質量%以上である(条件(c))。モノマーm2の量は、全モノマー成分の12~40質量%である(条件(d))。すなわち、全モノマー成分に占めるモノマーm1の量は、55~88質量%である。
(A)モノマーの混合物を共重合反応に供して粘着剤組成物を調製すること;
(B)基材上に上記粘着剤組成物を塗付すること;および、
(C)塗付された上記組成物に硬化処理を施して粘着剤層を形成すること;
を包含する。上記モノマー混合物は、モノマーm1として、次式(I):CH2=C(R1)COOR2(式中、R1は水素原子またはメチル基であり、R2は炭素数4~20のアルキル基である。);で表されるアルキル(メタ)アクリレートを含む。さらに、モノマーm2として、N-ビニルカプロラクタムを含む。これらモノマーm1およびm2の合計量は、全モノマー成分の95質量%以上である。同時に、モノマーm2の量は、全モノマー成分の12~40質量%の範囲にある。
なお、本明細書において、質量で表される全ての百分率や部は、重量で表される百分率や部と同様である。
ここで、式(I)中のR1は、水素原子またはメチル基である。また、式(I)中のR2は、炭素数4~20のアルキル基である。該アルキル基は直鎖状であってもよく、分岐を有してもよい。式(I)で表されるアルキル(メタ)アクリレートの具体例としては、n-ブチル(メタ)アクリレート、イソブチル(メタ)アクリレート、sec-ブチル(メタ)アクリレート、t-ブチル(メタ)アクリレート、ペンチル(メタ)アクリレート、イソペンチル(メタ)アクリレート、ヘキシル(メタ)アクリレート、ヘプチル(メタ)アクリレート、n-オクチル(メタ)アクリレート、イソオクチル(メタ)アクリレート、2-エチルヘキシル(メタ)アクリレート、ノニル(メタ)アクリレート、イソノニル(メタ)アクリレート、デシル(メタ)アクリレート、イソデシル(メタ)アクリレート、ウンデシル(メタ)アクリレート、ドデシル(メタ)アクリレート、トリデシル(メタ)アクリレート、テトラデシル(メタ)アクリレート、ペンタデシル(メタ)アクリレート、ヘキサデシル(メタ)アクリレート、ヘプタデシル(メタ)アクリレート、オクタデシル(メタ)アクリレート、ノナデシル(メタ)アクリレート、エイコシル(メタ)アクリレート等が挙げられる。これらのうちR2が炭素数4~14(以下、このような炭素数の範囲を「C4-14」と表すことがある。)のアルキル基であるアルキル(メタ)アクリレートが好ましく、R2がC4-10のアルキル基(例えば、n-ブチル基、2-エチルヘキシル基等)であるアルキル(メタ)アクリレートがより好ましい。
特に好ましいN含有モノマーとして、N-ビニル-2-ピロリドンが挙げられる。
2-エチルヘキシルアクリレート(2EHA) -70℃
n-ブチルアクリレート(BA) -54℃
N-ビニルカプロラクタム(NVC) 176℃
N-ビニル-2-ピロリドン(NVP) 54℃
ジエチルアクリルアミド(DEAA) 81℃
アクリル酸(AA) 106℃
置換エタン系開始剤としては、フェニル置換エタン等が例示される。
ベンゾインエーテル系光重合開始剤の具体例としては、ベンゾインメチルエーテル、ベンゾインエチルエーテル、ベンゾインプロピルエーテル、ベンゾインイソプロピルエーテル、ベンゾインイソブチルエーテル等が挙げられる。
α-ケトール系光重合開始剤の具体例としては、2-メチル-2-ヒドロキシプロピオフェノン、1-[4-(2-ヒドロキシエチル)フェニル]-2-メチルプロパン-1-オン等が挙げられる。
芳香族スルホニルクロリド系光重合開始剤の具体例としては、2-ナフタレンスルホニルクロライド等が挙げられる。
光活性オキシム系光重合開始剤の具体例としては、1-フェニル-1,1-プロパンジオン-2-(o-エトキシカルボニル)-オキシム等が挙げられる。
ベンゾイン系光重合開始剤の具体例としてはベンゾインが挙げられる。
ベンジル系光重合開始剤の具体例としてはベンジルが挙げられる。
チオキサントン系光重合開始剤の具体例としては、チオキサントン、2-クロロチオキサントン、2-メチルチオキサントン、2,4-ジメチルチオキサントン、イソプロピルチオキサントン、2,4-ジイソプロピルチオキサントン、ドデシルチオキサントン等が挙げられる。
[重合率測定]
共重合反応物から約0.5gのサンプルを採取して質量Wp1を精秤する。次いで、該サンプルを130℃に2時間加熱することにより未反応モノマーを揮発させ、その加熱後に残ったサンプルの質量Wp2を精秤する。重合率は、各値を以下の式に代入することにより求められる。
重合率(%) = (Wp2/Wp1)×100
ここで「粘着剤のゲル分率fg」とは、次の方法により測定される値をいう。該ゲル分率は、粘着剤のうち酢酸エチル不溶分の質量割合として把握され得る。
粘着剤サンプル(質量Wg1)を平均孔径0.2μmの多孔質ポリテトラフルオロエチレン膜(質量Wg2)で巾着状に包み、口をタコ糸(質量Wg3)で縛る。この包みを酢酸エチル50mLに浸し、室温(典型的には23℃)で7日間保持して粘着剤層中のゾル成分のみを上記膜外に溶出させた後、上記包みを取り出して外表面に付着している酢酸エチルを拭き取り、該包みを130℃で2時間乾燥させ、該包みの質量Wg4を測定する。粘着剤のゲル分率fgは、各値を以下の式に代入することにより求められる。
fg(%) = [(Wg4-Wg2-Wg3)/Wg1]×100
なお、上記多孔質ポリテトラフルオロエチレン(PTFE)膜としては、日東電工株式会社から入手可能な商品名「ニトフロン(登録商標)NTF1122」(平均孔径0.2μm、気孔率75%、厚さ85μm)またはその相当品を使用することが望ましい。
部分重合物を用いた粘着剤組成物では、典型的には、上記硬化処理として、最終的な共重合反応を行う(部分重合物を更なる共重合反応に供して完全重合物を形成する)。例えば、光硬化性の粘着剤組成物であれば、光照射を行う。必要に応じて、架橋、乾燥等の硬化処理を行ってもよい。例えば、光硬化性粘着剤組成物で乾燥させる必要がある場合は、乾燥後に光硬化を行うとよい。
完全重合物を用いた粘着剤組成物では、典型的には、上記硬化処理として、必要に応じて乾燥(加熱乾燥)、架橋等の処理を行う。
なお、基材付き粘着シートの場合、基材に粘着剤組成物を直接付与して粘着剤層を形成してもよく、剥離ライナー上に形成した粘着剤層を基材に転写してもよい。
2EHA80部およびNVC20部からなるモノマー混合物100部に対し、光重合開始剤として2,2-ジメトキシ-1,2-ジフェニルエタン-1-オン(チバ・ジャパン社製品、商品名「イルガキュア651」)0.05部および1-ヒドロキシ-シクロヘキシル-フェニルケトン(チバ・ジャパン社製品、商品名「イルガキュア184」)0.05部を加えた。この混合物を窒素ガス雰囲気下で攪拌して溶存酸素を十分に除去した後、該混合物に紫外線を照射することにより、上記モノマー混合物の部分重合物(重合率10.2%)を得た。
モノマー混合物の組成を、2EHA70部/NVC30部とした他は例1と同様にして、両面粘着シートを得た。部分重合物の重合率は、11.8%であった。硬化後の粘着剤のゲル分率は、69.0%であった。
モノマー混合物の組成を、2EHA80部/NVC16部/NVP4部とした他は例1と同様にして、重合率8.9%の部分重合物を得た。この部分重合物に、HDDAを0.018部添加し、さらに光重合開始剤(追加分)として、商品名「イルガキュア651」および「イルガキュア184」を各々0.05部加えた他は例1と同様にして、両面粘着シートを得た。硬化後の粘着剤のゲル分率は、50.0%であった。
モノマー混合物の組成を、BA80部/NVC20部とした他は例1と同様にして、両面粘着シートを得た。部分重合物の重合率は、約10%であった。硬化後の粘着剤のゲル分率は、40.7%であった。
2EHA80部とNVC20部とのモノマー混合物から、例1と同様にして、重合率約10%の部分重合物P1を得た。BA80部とNVC20部とのモノマー混合物から、同様に、重合率約10%の部分重合物P2を得た。60部のP1および40部のP2の混合物(モノマー組成:2EHA:BA:NVC=48:32:20)に、HDDAを0.02部添加し、例1と同様にして、両面粘着シートを得た。硬化後の粘着剤のゲル分率は、47.4%であった。
2EHA80部とNVP20部とのモノマー混合物から、例1と同様にして、重合率約13.5%の部分重合物P3を得た。50部のP1(例5)と50部のP3との混合物(モノマー組成:2EHA:NVC:NVP=80:10:10)に、HDDAを0.02部添加し、例1と同様にして、両面粘着シートを得た。硬化後の粘着剤のゲル分率は、70.5%であった。
モノマー混合物の組成を、2EHA90部/NVC10部とし、HDDAの量を、0.045部とした他は例1と同様にして、両面粘着シートを得た。部分重合物の重合率は、約10%であった。硬化後の粘着剤のゲル分率は、63.1%であった。
モノマー混合物の組成を、2EHA80部/NVP20部とした他は例1と同様にして、両面粘着シートを得た。部分重合物の重合率は、13.5%であった。硬化後の粘着剤のゲル分率は、57.7%であった。
モノマー混合物の組成を、2EHA70部/DEAA30部とし、HDDAの量を0.08部とした他は例3と同様にして、両面粘着シートを得た。部分重合物の重合率は、11.2%であった。硬化後の粘着剤のゲル分率は、49.0%であった。
モノマー混合物の組成を、2EHA90部/AA10部とし、HDDAの量を、0.04部とした他は例1と同様にして、両面粘着シートを得た。部分重合物の重合率は、約9.0%であった。硬化後の粘着剤のゲル分率は、69.7%であった。
各例の粘着剤のゲル分率は、上述した方法により測定した。多孔質PTFE膜(質量W2)としては、100mm×100mmの商品名「ニトフロン(登録商標)NTF1122」(日東電工株式会社製品;厚さ85μm)を使用した。タコ糸(質量W3)は、太さ1.5mm、長さ約100mmのものを使用した。粘着剤サンプル(質量W1)には、20cm2のサイズにカットした各粘着シートから両方の剥離ライナーを剥がしたものを用いた。
各粘着シートから一枚目の剥離ライナーを剥がして露出した第1粘着面に、厚さ50μmのPETフィルム(剥離処理なし)を貼り合わせた。これを25mm幅にカットして試験片を作製した。この試験片から二枚目の剥離ライナーを剥がし、5kgのローラを一回転がす方法で被着体に圧着した。上記被着体としては、イソプロピルアルコールを染み込ませたクリーンウェスで10往復擦って洗浄した清浄なPP板を使用した。これを40℃で2日間、室温(23℃)で30分間保持した後、引張試験機を用い、引張速度300mm/分、剥離角度180°の条件にて、PP板に対する剥離強度(N/25mm)を測定した。上記手順にて洗浄したアクリル板を被着体とし、対PP剥離強度と同様に、対アクリル板剥離強度を測定した。対ABS板剥離強度も同様にして測定した。それらの結果に基づき、PP板、アクリル板およびABS板の何れに対しても剥離強度が10N/25mm以上であるものを○、少なくとも何れかが10N/25mmより小さい値となったものを×として評価した。
[室温環境]
各両面粘着シートを幅10mm、長さ90mmのサイズにカットし、一枚目の剥離ライナーを剥がして露出した第1粘着面に、同じサイズにカットしたアルミニウム片(厚さ0.5mm)を貼り合わせて試験片を作製した。この試験片を23℃、RH50%の環境下に1日保持した後、R(曲率半径)50mmの曲率で、アルミニウム片側が内側になるよう、長手方向に沿って湾曲させた。この試験片から二枚目の剥離ライナーを剥がして露出した第2粘着面を、ラミネータでPP板(200mm×300mm、厚さ2mm)に圧着した。これを23℃、RH50%の環境下に2時間保持した後に、該試験片の各端部が該PP板表面から浮きあがった距離(mm)を測定した。上記PP板をアクリル板に替え、上記と同様にして、試験片の各端部がアクリル板表面から浮きあがった距離(mm)を測定した。それら結果に基づき、室温環境における各粘着シートの耐反撥性を次の二段階に評価した。
○:浮き距離の両端平均が、対PPおよび対アクリルのいずれも5mm以下であった。
×:浮き距離の両端平均が、対PPおよび対アクリルの少なくともいずれかが5mmより大きかった。
[湿熱環境]
室温環境における測定と同様にして作製した試験片を、アルミニウム片側が内側になるよう、R160mmの曲率で長手方向に沿って湾曲させ、アクリル板に圧着した。これを、60℃、RH95%の環境下に7時間保持した後、該試験片の各端部が該アクリル板表面から浮きあがった距離(mm)を測定した。それら結果に基づき、湿熱環境における各粘着シートの耐反撥性を次の二段階に評価した。
○: アクリル板からの浮き距離の両端平均が5mm以下であった。
×: アクリル板からの浮き距離の両端平均が5mmより大きかった。
2:粘着剤層
3:剥離ライナー
11,12,13,14,15,16:粘着シート
Claims (8)
- アクリル系粘着剤組成物であって、
以下の条件:
モノマーm1として、次式(I):
CH2=C(R1)COOR2 (I)
ここで、R1は水素原子またはメチル基であり、R2は炭素数4~20のアルキル基である;で表されるアルキル(メタ)アクリレートを含む;
モノマーm2として、N-ビニルカプロラクタムを含む;
モノマーm1およびモノマーm2の合計量が、全モノマー成分の95質量%以上である;および、
モノマーm2の量が、全モノマー成分の12~40質量%である;
のいずれをも満たすモノマー混合物の共重合反応物を含む、粘着剤組成物。 - さらに以下の条件:
前記共重合反応物が部分重合物である;
光重合開始剤を含む;および、
溶媒を実質的に含まない;
のいずれをも満たす、請求項1に記載の粘着剤組成物。 - 架橋剤をさらに含む、請求項1または2に記載の粘着剤組成物。
- 前記モノマー混合物は、該混合物の共重合体のガラス転移温度Tgが-10℃以下となるモノマー組成を有する、請求項1から3のいずれか一項に記載の粘着剤組成物。
- 前記モノマー成分は、モノマーm3として、N-ビニルカプロラクタム以外の窒素含有モノマーをさらに含む、請求項1から4のいずれか一項に記載の粘着剤組成物。
- 粘着剤層として、請求項1から5のいずれか一項に記載の粘着剤組成物の硬化層を備える、粘着シート。
- 光学部材と、その上に積層された粘着剤層と、を備える積層体であって、
前記光学部材は、前記粘着剤層に接する側に低極性表面を有し、
前記粘着剤層は、請求項1から6のいずれか一項に記載される粘着剤組成物の硬化層である、積層体。 - 粘着シートを製造する方法であって:
(A)モノマー混合物を共重合反応に供して粘着剤組成物を調製すること、ここで、該モノマー混合物は、以下の条件:
モノマーm1として、次式(I):
CH2=C(R1)COOR2 (I)
ここで、R1は水素原子またはメチル基であり、R2は炭素数4~20のアルキル基である;で表されるアルキル(メタ)アクリレートを含む;
モノマーm2として、N-ビニルカプロラクタムを含む;
モノマーm1,m2の合計量が、全モノマー成分の95質量%以上である;および、
モノマーm2の量が、全モノマー成分の12~40質量%である;
のいずれをも満たす;
(B)基材上に前記粘着剤組成物を塗付すること;および、
(C)塗付された前記組成物を硬化させて粘着剤層を形成すること;
を包含する、粘着シート製造方法。
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JPH05105857A (ja) * | 1991-08-21 | 1993-04-27 | Sekisui Chem Co Ltd | 粘着剤組成物および粘着テープ、ラベルもしくはシート |
JP2005179481A (ja) * | 2003-12-18 | 2005-07-07 | Nitto Denko Corp | 積層シート及び液晶表示装置 |
JP2009544815A (ja) * | 2006-07-24 | 2009-12-17 | スリーエム イノベイティブ プロパティズ カンパニー | 導電性感圧性接着剤 |
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US5028484A (en) * | 1987-08-14 | 1991-07-02 | Minnesota Mining And Manufacturing Company | Pressure-sensitive adhesive |
EP1245656A1 (en) * | 2001-03-30 | 2002-10-02 | 3M Innovative Properties Company | Transparent pressure-sensitive adhesive layer |
JP4697871B2 (ja) * | 2005-10-20 | 2011-06-08 | 日東電工株式会社 | 積層フィルム |
JP4493643B2 (ja) * | 2006-12-06 | 2010-06-30 | 日東電工株式会社 | 再剥離型粘着剤組成物、及び粘着テープ又はシート |
JP5105856B2 (ja) * | 2006-12-20 | 2012-12-26 | Necシステムテクノロジー株式会社 | ストレージシステム、論理ボリュームのレプリケーション方法・プログラム |
JP5105857B2 (ja) * | 2006-12-21 | 2012-12-26 | 中国電力株式会社 | 絶縁碍子用簡易足場装置 |
JP5095279B2 (ja) * | 2007-07-06 | 2012-12-12 | 日東電工株式会社 | 車両用塗膜面接着用粘着シート |
JP2012229375A (ja) * | 2011-04-27 | 2012-11-22 | Nitto Denko Corp | 粘着シート |
-
2010
- 2010-01-07 US US13/521,115 patent/US20120288710A1/en not_active Abandoned
- 2010-01-07 JP JP2010002235A patent/JP2011140571A/ja active Pending
-
2011
- 2011-01-06 EP EP11731826.1A patent/EP2522706A4/en not_active Withdrawn
- 2011-01-06 CN CN201180005664.1A patent/CN102695767B/zh not_active Expired - Fee Related
- 2011-01-06 KR KR1020127017652A patent/KR20120112522A/ko not_active Application Discontinuation
- 2011-01-06 WO PCT/JP2011/050132 patent/WO2011083828A1/ja active Application Filing
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JPS6173780A (ja) * | 1984-09-17 | 1986-04-15 | ジヨンソン・アンド・ジヨンソン・プロダクツ・インコーポレイテツド | N‐ビニルカプロラクタムを含有するホツトメルト接着剤 |
JPS63308079A (ja) * | 1987-04-10 | 1988-12-15 | ミネソタ マイニング アンド マニユフアクチユアリング カンパニー | 感圧接着剤 |
JPH02502653A (ja) * | 1987-12-23 | 1990-08-23 | エイベリ デニソン コーポレイション | 高性能感圧接着剤ポリマー |
JPH05105856A (ja) * | 1991-08-21 | 1993-04-27 | Sekisui Chem Co Ltd | 水分散性粘着剤組成物及び粘着テープ、ラベルもしくはシート |
JPH05105857A (ja) * | 1991-08-21 | 1993-04-27 | Sekisui Chem Co Ltd | 粘着剤組成物および粘着テープ、ラベルもしくはシート |
JP2005179481A (ja) * | 2003-12-18 | 2005-07-07 | Nitto Denko Corp | 積層シート及び液晶表示装置 |
JP2009544815A (ja) * | 2006-07-24 | 2009-12-17 | スリーエム イノベイティブ プロパティズ カンパニー | 導電性感圧性接着剤 |
Non-Patent Citations (1)
Title |
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See also references of EP2522706A4 * |
Also Published As
Publication number | Publication date |
---|---|
EP2522706A1 (en) | 2012-11-14 |
EP2522706A4 (en) | 2014-01-08 |
CN102695767B (zh) | 2014-11-12 |
KR20120112522A (ko) | 2012-10-11 |
CN102695767A (zh) | 2012-09-26 |
US20120288710A1 (en) | 2012-11-15 |
JP2011140571A (ja) | 2011-07-21 |
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