WO2018025808A1 - (メタ)アクリル系トリブロック共重合体およびその製造方法、粘着剤組成物ならびに粘着シート - Google Patents
(メタ)アクリル系トリブロック共重合体およびその製造方法、粘着剤組成物ならびに粘着シート Download PDFInfo
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- WO2018025808A1 WO2018025808A1 PCT/JP2017/027714 JP2017027714W WO2018025808A1 WO 2018025808 A1 WO2018025808 A1 WO 2018025808A1 JP 2017027714 W JP2017027714 W JP 2017027714W WO 2018025808 A1 WO2018025808 A1 WO 2018025808A1
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- 0 CCN(C*)C(c1ccc(CSC(SCc(cc2)ccc2C(N(CC)C*)=O)=S)cc1)=O Chemical compound CCN(C*)C(c1ccc(CSC(SCc(cc2)ccc2C(N(CC)C*)=O)=S)cc1)=O 0.000 description 1
Classifications
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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
- C08F293/00—Macromolecular compounds obtained by polymerisation on to a macromolecule having groups capable of inducing the formation of new polymer chains bound exclusively at one or both ends of the starting macromolecule
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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
- C08F2/00—Processes of polymerisation
- C08F2/38—Polymerisation using regulators, e.g. chain terminating agents, e.g. telomerisation
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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
- C09J153/00—Adhesives based on block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Adhesives based on derivatives of such polymers
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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
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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
- C09J7/387—Block-copolymers
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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
- C08F2438/00—Living radical polymerisation
- C08F2438/03—Use of a di- or tri-thiocarbonylthio compound, e.g. di- or tri-thioester, di- or tri-thiocarbamate, or a xanthate as chain transfer agent, e.g . Reversible Addition Fragmentation chain Transfer [RAFT] or Macromolecular Design via Interchange of Xanthates [MADIX]
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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
Definitions
- the present invention relates to a (meth) acrylic triblock copolymer, a method for producing the same, a pressure-sensitive adhesive composition, and a pressure-sensitive adhesive sheet.
- Patent Documents 1 to 4 describe a pressure-sensitive adhesive composition containing a (meth) acrylic block copolymer obtained by a living radical polymerization method.
- Patent Document 1 describes a pressure-sensitive adhesive composition containing a (meth) acrylic block copolymer obtained by RAFT polymerization using a reversible addition-fragmentation chain transfer (RAFT) agent.
- RAFT reversible addition-fragmentation chain transfer
- the pressure-sensitive adhesive composition containing such a block copolymer needs further improvement in terms of pressure-sensitive adhesive properties with respect to various adherends.
- An object of the present invention is to further improve the adhesive properties of various adherends with respect to an adhesive composition containing a (meth) acrylic block copolymer.
- the present invention includes, for example, the following [1] to [11].
- [1] A (meth) acrylic triblock copolymer (A) obtained by RAFT polymerization using a RAFT agent represented by the formula (a1).
- R is a monovalent organic group which does not have any of a hydroxyl group, a carboxyl group, and an amino group, and two R may be mutually the same or different.
- Block A-Block B-Block A has a triblock structure
- Block B has a divalent structure represented by —S—C ( ⁇ S) —S—, and a copolymer (A
- the total content of block A is 5 to 40% by mass in 100% by mass, and the content of block B is 95 to 60% by mass according to any one of [1] to [3] (Meth) acrylic triblock copolymer (A).
- the content of the structural unit derived from the reactive functional group-containing monomer is 0.5 to 15% by mass, and in 100% by mass of all structural units derived from the reactive functional group-containing monomer. 95% by mass or more of the (meth) acrylic triblock copolymer (A) according to the above [4].
- the adhesive composition excellent in the adhesive physical property with respect to various to-be-adhered bodies can be provided, and the (meth) acrylic triblock copolymer suitable as a content component of the said composition is provided. be able to.
- (meth) acrylic triblock copolymer and the production method thereof, the pressure-sensitive adhesive composition and the pressure-sensitive adhesive sheet of the present invention will be described in detail including preferred embodiments.
- polymer is used to include homopolymers and copolymers
- polymerization is used to include homopolymerization and copolymerization.
- Acrylic and methacrylic are also collectively referred to as “(meth) acrylic”.
- a copolymer having at least a structural unit derived from a (meth) acrylic acid ester is also referred to as a “(meth) acrylic copolymer”, in order to form the copolymer in the copolymer. It is preferable that 70 mass% or more is a (meth) acrylic acid ester among the raw material monomers used for.
- RAFT reversible addition-fragmentation chain transfer
- the (meth) acrylic triblock copolymer (A) of the present invention is a RAFT polymerization using the RAFT agent represented by the formula (a1), specifically, a polymerizable double bond containing at least a (meth) acrylic ester. It is obtained by RAFT polymerization of the containing monomer.
- R is a monovalent organic group having no hydroxyl group, carboxyl group or amino group.
- Two Rs may be the same or different from each other, but are preferably the same group from the viewpoint of synthesis.
- the copolymer obtained also does not have the above-listed functional groups at the molecular terminal derived from the RAFT agent.
- Examples of the monovalent organic group include hydrocarbon groups such as alkyl groups, aryl groups, and aralkyl groups, acyl groups represented by R 1 —C ( ⁇ O) —, and R 1 —C ( ⁇ O) —O.
- R 1 is an alkyl group
- R 2 is an alkylene group.
- an acyl group, an acyloxy group, and an acyloxy group are advantageous in that the RAFT agent tends to be liquid at room temperature and has excellent handling properties and excellent adhesive properties for various adherends with high or low polarity.
- Alkyl groups are preferred.
- the alkyl group usually has 1 to 12 carbon atoms, preferably 1 to 6 carbon atoms, and examples thereof include a methyl group, an ethyl group, a propyl group, a butyl group and a hexyl group.
- the carbon number of the aryl group is usually 6 to 18, preferably 6 to 12, and examples thereof include a phenyl group and a naphthyl group.
- the carbon number of the aralkyl group is usually 7 to 18, preferably 7 to 12, and examples thereof include a benzyl group and a phenethyl group.
- the carbon number of the acyl group and the acyloxy group is usually 2 to 8, preferably 2 to 6, and examples thereof include an acetyl group and an acetyloxy group.
- the acyloxyalkyl group usually has 3 to 8 carbon atoms, preferably 3 to 6 carbon atoms, and examples thereof include an acetyloxymethyl group.
- Examples of the RAFT agent represented by the formula (a1) include the following compounds.
- the RAFT agent has a trithiocarbonate structure in the molecule, and does not have a hydroxyl group, a carboxyl group, or an amino group in the R.
- the RAFT agent can be synthesized, for example, according to the method described in JP-A-2007-230947.
- the copolymer (A) preferably has a triblock structure of block A-block B-block A.
- the block B has a divalent structure represented by —S—C ( ⁇ S) —S—.
- a sea-island structure where the block A becomes an island and a block B becomes the sea, a gyroid structure or a cylinder structure can be formed, and an appropriate cohesive force can be imparted to the adhesive.
- a sea-island structure where the block A becomes an island and a block B becomes the sea, a gyroid structure or a cylinder structure can be formed, and an appropriate cohesive force can be imparted to the adhesive.
- a sea-island structure where the block A becomes an island and a block B becomes the sea
- a gyroid structure or a cylinder structure can be formed, and an appropriate cohesive force can be imparted to the adhesive.
- an appropriate cohesive force can be imparted to the adhesive.
- the total content of block A is preferably 5 to 40% by mass, more preferably 10 to 30% by mass, and the content of block B is preferably 95 to 60% by mass. %, More preferably 90 to 70% by mass.
- the content of the structural unit derived from the reactive functional group-containing monomer is preferably 0.5 to 15% by mass, more preferably 0.8 to 12% by mass. More preferably, it is 1 to 10% by mass.
- the structural unit amount can be calculated from, for example, the amount of each monomer used and the residual amount of each monomer based on gas chromatography analysis of the polymer solution after polymerization. If it is such an aspect, an adhesive can take an appropriate crosslinked form, and it is preferable at the point which is excellent in various adhesive physical properties.
- all the structural units of a copolymer (A) are all the structural units derived from a raw material monomer.
- copolymer (A) it is preferable that 95 mass% or more exists in 100 mass% of all the structural units derived from a reactive functional group containing monomer in block A, More preferably, it is 98 mass% or more. In such an embodiment, since the reactive functional group is localized in the block A, the curing is quick and the aging period of the pressure-sensitive adhesive composition can be shortened.
- a copolymer (A) is represented by a following formula, for example.
- R is synonymous with the same symbol in formula (a1), and Ap is independently a divalent group derived from a polymer of a polymerizable double bond-containing monomer (of the polymerizable double bond-containing monomer).
- Bp is a divalent group (polymer chain of a polymerizable double bond-containing monomer) derived from a polymer of a polymerizable double bond-containing monomer.
- Ap corresponds to the above-described block A
- At least one of the blocks A and B preferably has a structural unit derived from a (meth) acrylic acid ester.
- a pressure-sensitive adhesive composition having good pressure-sensitive adhesive properties eg, holding power, tack
- various adherends such as high-polar materials and polyolefin-based low-polar materials.
- the raw material monomer of the copolymer (A) is a polymerizable double bond-containing monomer containing at least a (meth) acrylic acid ester.
- the polymerizable double bond-containing monomer include, for example, (meth) acrylic acid ester having no reactive functional group described below, and a monomer having at least one reactive functional group (hereinafter referred to as “reactive functional group-containing monomer”). And copolymerizable monomers other than these monomers.
- the reactive functional group include an acid group, a hydroxyl group, an amino group, an amide group, a cyano group, and a nitrogen-based heterocyclic ring.
- Examples of the (meth) acrylic acid ester having no reactive functional group include, for example, alkyl (meth) acrylate, alkoxyalkyl (meth) acrylate, alkoxypolyalkylene glycol mono (meth) acrylate, alicyclic group or aromatic ring (Meth) acrylate is mentioned.
- the number of carbon atoms of the alkyl group in the alkyl (meth) acrylate is preferably 1-20.
- the alkyl (meth) acrylate include methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, iso-propyl (meth) acrylate, n-butyl (meth) acrylate, iso-butyl ( (Meth) acrylate, tert-butyl (meth) acrylate, pentyl (meth) acrylate, hexyl (meth) acrylate, heptyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, octyl (meth) acrylate, iso-octyl (meth) Acrylate, nonyl (meth) acrylate, iso-nonyl (meth) acrylate, decy
- alkoxyalkyl (meth) acrylate examples include methoxymethyl (meth) acrylate, 2-methoxyethyl (meth) acrylate, 2-ethoxyethyl (meth) acrylate, 3-methoxypropyl (meth) acrylate, 3-ethoxypropyl ( And (meth) acrylate, 4-methoxybutyl (meth) acrylate, and 4-ethoxybutyl (meth) acrylate.
- alkoxypolyalkylene glycol mono (meth) acrylate examples include methoxydiethylene glycol mono (meth) acrylate, methoxydipropylene glycol mono (meth) acrylate, ethoxytriethylene glycol mono (meth) acrylate, ethoxydiethylene glycol mono (meth) acrylate, And methoxytriethylene glycol mono (meth) acrylate.
- Examples of the alicyclic group or aromatic ring-containing (meth) acrylate include cyclohexyl (meth) acrylate, isobornyl (meth) acrylate, dicyclopentanyl (meth) acrylate, dicyclopentenyl (meth) acrylate, and benzyl (meth). Examples include acrylate and phenyl (meth) acrylate.
- the said (meth) acrylic acid ester can be used individually by 1 type or 2 or more types.
- the amount of the (meth) acrylic acid ester having no reactive functional group is usually 70% by mass or more, preferably 80% in 100% by mass of the total polymerizable double bond-containing monomer excluding the reactive functional group-containing monomer. It is 90 mass% or more more preferably.
- Examples of the reactive functional group-containing monomer include an acid group-containing monomer, a hydroxyl group-containing monomer, an amino group-containing monomer, an amide group-containing monomer, a cyano group-containing monomer, and a nitrogen-based heterocyclic ring-containing monomer.
- Examples of the acid group in the acid group-containing monomer include a carboxyl group, an acid anhydride group, a phosphoric acid group, and a sulfuric acid group.
- Examples of the acid group-containing monomer include ⁇ -carboxyethyl (meth) acrylate, 5-carboxypentyl (meth) acrylate, mono (meth) acryloyloxyethyl ester succinate, and ⁇ -carboxypolycaprolactone mono (meth) acrylate.
- Carboxyl group-containing monomers such as carboxyl group-containing (meth) acrylate, (meth) acrylic acid, itaconic acid, crotonic acid, fumaric acid, maleic acid and other unsaturated carboxylic acids; maleic anhydride and other acid anhydride groups Monomers; phosphate group-containing monomers such as (meth) acrylic monomers having a phosphate group in the side chain; and sulfate group-containing monomers such as (meth) acrylic monomers having a sulfate group in the side chain.
- hydroxyl group-containing monomer examples include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 6-hydroxyhexyl (meth) acrylate, 8-hydroxyoctyl (meta ) Hydroxyl group-containing (meth) acrylates such as acrylate.
- amino group-containing monomer examples include amino group-containing (meth) acrylates such as dimethylaminoethyl (meth) acrylate and diethylaminoethyl (meth) acrylate.
- Examples of the amide group-containing monomer include (meth) acrylamides such as (meth) acrylamide, N-methyl (meth) acrylamide, N-ethyl (meth) acrylamide, N-propyl (meth) acrylamide, and N-hexyl (meth) acrylamide.
- An acrylic amide is mentioned.
- Examples of the cyano group-containing monomer include cyano (meth) acrylate and (meth) acrylonitrile.
- Examples of the nitrogen-based heterocyclic ring-containing monomer include vinyl pyrrolidone, (meth) acryloylmorpholine, and vinyl caprolactam.
- the reactive functional group-containing monomers at least one selected from a carboxyl group-containing monomer and a hydroxyl group-containing monomer is preferable from the viewpoint of crosslinking reactivity with the crosslinking agent (B1) described later.
- the reactive functional group-containing monomer can be used alone or in combination of two or more.
- the use amount of the reactive functional group-containing monomer is usually 0.5 to 15% by mass, preferably 0.8 to 12% by mass, more preferably 1 to 10% in 100% by mass of the total polymerizable double bond-containing monomer. % By mass.
- at least 1 sort (s) chosen from a carboxyl group-containing monomer and a hydroxyl group-containing monomer it is preferable that these total amount exists in the said range.
- Examples of the copolymerizable monomer include a styrene monomer and a vinyl monomer.
- the styrene monomer include styrene, ⁇ -methyl styrene; alkyl styrene such as methyl styrene, dimethyl styrene and octyl styrene; halogenated styrene such as fluoro styrene, chloro styrene and bromo styrene; other nitro styrene, acetyl styrene, Methoxystyrene is mentioned.
- a vinyl-type monomer vinyl acetate is mentioned, for example.
- the copolymerizable monomer can be used alone or in combination of two or more.
- RAFT agent> In RAFT polymerization, a polymerizable double bond-containing monomer is polymerized in the presence of a RAFT agent represented by the formula (a1).
- the use amount of the RAFT agent represented by the formula (a1) is usually 0.05 to 20 parts by mass, preferably 0.05 to 10 parts by mass with respect to 100 parts by mass of the polymerizable double bond-containing monomer. . If it is such an aspect, reaction control is easy and it is easy to adjust the weight average molecular weight of the copolymer obtained to the range mentioned later.
- RAFT polymerization is preferably performed in the presence of a polymerization initiator.
- the polymerization initiator include ordinary organic polymerization initiators. Specific examples include peroxides such as benzoyl peroxide and lauroyl peroxide, and 2,2′-azobisisobutyronitrile. An azo compound is mentioned. Among these, an azo compound is preferable.
- azo compound examples include 2,2′-azobisisobutyronitrile, 2,2′-azobis (4-methoxy-2,4-dimethylvaleronitrile), 2,2′-azobis (2-cyclopropyl). Propionitrile), 2,2'-azobis (2,4-dimethylvaleronitrile), 2,2'-azobis (2-methylbutyronitrile), 1,1'-azobis (cyclohexane-1-carbonitrile) 2- (carbamoylazo) isobutyronitrile, 2-phenylazo-4-methoxy-2,4-dimethylvaleronitrile, 2,2′-azobis (2-amidinopropane) dihydrochloride, 2,2′-azobis ( N, N′-dimethyleneisobutylamidine), 2,2′-azobis (isobutylamido) dihydrate, 4,4′-azobis (4-cyanopentanoic acid), , 2'-azobis (2-cyanopropanol), dimethyl-2
- the polymerization initiator can be used alone or in combination of two or more.
- the amount of the polymerization initiator used is usually 0.001 to 2 parts by mass, preferably 0.002 to 1 part by mass with respect to 100 parts by mass of the polymerizable double bond-containing monomer. If it is such an aspect, it is easy to adjust the weight average molecular weight of the copolymer obtained to the range mentioned later.
- the RAFT polymerization may be bulk polymerization without using a polymerization solvent, but the RAFT polymerization may use a polymerization solvent if necessary.
- polymerization solvent examples include aromatic hydrocarbons such as benzene, toluene, and xylene; aliphatic hydrocarbons such as n-pentane, n-hexane, n-heptane, and n-octane; cyclopentane, cyclohexane, cycloheptane, cyclo Alicyclic hydrocarbons such as octane; Halogenated hydrocarbons such as chloroform, carbon tetrachloride, 1,2-dichloroethane, chlorobenzene; Diethyl ether, diisopropyl ether, 1,2-dimethoxyethane, dibutyl ether, tetrahydrofuran, dioxane, anisole Ethers such as ethyl acetate, propyl acetate, butyl acetate, and methyl propionate; ketones such as acetone, methyl ethyl ketone
- N N- dimethylformamide, N, N- dimethylacetamide, N- amides such as methylpyrrolidone; acetonitrile, nitriles such as benzonitrile; dimethylsulfoxide, sulfoxide and sulfolane.
- the polymerization solvent can be used alone or in combination of two or more.
- the method for producing the copolymer (A) of the present invention includes, for example, a step 1 (first RAFT polymerization) in which a polymerizable double bond-containing monomer is polymerized using a RAFT agent represented by the formula (a1), and a step Step 2 (second RAFT polymerization) in which the polymer obtained in Step 1 is further polymerized by further adding a polymerizable double bond-containing monomer different from the monomer composition in Step 1.
- One or both of the monomer used in step 1 and the monomer added in step 2 include a (meth) acrylic acid ester, and preferably both include a (meth) acrylic acid ester.
- the polymerizable double bond-containing monomer different from the monomer composition in step 1 is different from the monomer composition used in step 1 in that the monomer composition added in step 2 is different from the monomer type (in each step When using and adding seed monomers, this means excluding the case where the monomer is identical, including the proportion.
- the monomer used in Step 1 and the additive monomer in Step 2 may include a common monomer.
- step 1 Even if the monomer used in step 1 is the same as the monomer added in step 2, a plurality of types of monomers are used and added, and the ratio in the monomer used in step 1 (eg, methyl acrylate) 90 wt% and butyl acrylate 10 wt%) may be different from the ratio in the added monomer in Step 2 (eg, methyl acrylate 10 wt%, butyl acrylate 90 wt%).
- the ratio in the monomer used in step 1 eg, methyl acrylate 90 wt% and butyl acrylate 10 wt%
- the ratio in the added monomer in Step 2 eg, methyl acrylate 10 wt%, butyl acrylate 90 wt%).
- RAFT polymerization reaction is performed such that a polymerizable double bond-containing monomer as a raw material monomer is inserted between a sulfur atom in the RAFT agent represented by the formula (a1) and a methylene group adjacent to the sulfur atom, Polymerization proceeds.
- the reaction temperature in the RAFT polymerization method is usually 60 to 120 ° C., preferably 70 to 110 ° C., and is usually carried out in an inert gas atmosphere such as nitrogen gas. This reaction can be carried out under any conditions of normal pressure, pressurization and reduced pressure, and is usually carried out at normal pressure.
- the reaction time is usually 1 to 20 hours, preferably 2 to 14 hours. These conditions can be applied to Step 1 and Step 2, respectively.
- JP-A-2007-230947 and JP-A-2011-52057 can be referred to.
- the weight average molecular weight (Mw) measured by the GPC method of the polymer obtained in Step 1 is preferably 3,000 to 40,000, more preferably 5,000 to 38,000, and still more preferably 8 , 3,000 to 36,000.
- Step 1 it is preferable to use 95% by mass or more, particularly 98% by mass or more of the reactive functional group-containing monomer in Step 1 out of 100% by mass of the reactive functional group-containing monomer that can be used in Step 1 and Step 2.
- the reactive functional group since the reactive functional group is localized in the block A, the curing is quick and the aging period of the pressure-sensitive adhesive composition can be shortened.
- the amount ratio of the monomers used in Step 1 and Step 2 is not particularly limited, and is appropriately set according to, for example, the amount ratio of the block A and the block B in the target copolymer (A).
- the amount of the polymerizable double bond-containing monomer added in step 2 is preferably 150 to 1900 parts by mass, more preferably 233 to 900 parts by mass with respect to 100 parts by mass of the polymer obtained in step 1. is there.
- the weight average molecular weight (Mw) measured by the gel permeation chromatography method (GPC method) of the copolymer (A) is preferably 30,000 to 600,000, more preferably 50,000 to 550, 000, more preferably 80,000 to 500,000. If it is such an aspect, since sufficient cohesion force is provided to an adhesive composition, it is preferable from a viewpoint of the durable improvement on high temperature drying conditions or high temperature high humidity conditions.
- the molecular weight distribution (Mw / Mn) of the copolymer (A) is preferably 1.5 to 5.0, more preferably 1.5 to 4.8, still more preferably 1.7 to 4.5. is there. If it is such an aspect, while the crosslinked body and / or hardened
- the molecular weight and molecular weight distribution can be measured under the conditions described in the examples.
- the glass transition temperature (Tg) of the copolymer (A) is preferably less than 0 ° C., more preferably ⁇ 70 to ⁇ 20 ° C., still more preferably ⁇ 60 to ⁇ 30 ° C. It is preferable from the viewpoint of the adhesiveness of the adhesive layer to the adherend that Tg is within the above range. Moreover, if Tg is more than the said lower limit, it is excellent from the viewpoint of the durability improvement which is excellent in the cohesive force of an adhesive layer.
- the Tg of the copolymer (A) can be calculated from, for example, the formula of Tg and Fox of the homopolymer of each monomer. As the Tg of the homopolymer of each monomer, for example, a value described in Polymer Handbook Fourth Edition (Wiley-Interscience 2003) can be used.
- the Tg of block A is preferably ⁇ 30 to 150 ° C., more preferably ⁇ 20 to 120 ° C.
- the Tg of block B is preferably ⁇ 80 to ⁇ 40 ° C., more preferably ⁇ 75. ⁇ -50 ° C.
- the Tg of each block can also be calculated from, for example, the formula of Tg and Fox of the homopolymer of each monomer.
- combined on the following conditions is measured on the following conditions, for example.
- a reactor equipped with a stirrer, a reflux condenser, a thermometer, and a nitrogen introduction tube is charged with 100 parts by mass of a monomer and 100 parts by mass of an ethyl acetate solvent, and heated to 80 ° C. while introducing nitrogen gas.
- 0.1 part by mass of 2,2′-azobisisobutyronitrile is added, and a polymerization reaction is performed at 80 ° C. for 6 hours in a nitrogen gas atmosphere.
- the obtained homopolymer is sealed in a simple airtight pan.
- DSC differential scanning calorimeter
- the pressure-sensitive adhesive composition of the present invention contains the above-described (meth) acrylic triblock copolymer (A). It is preferable that the adhesive composition of this invention further contains a hardening
- the content of the (meth) acrylic triblock copolymer (A) is usually 60% by mass or more, preferably 65% by mass or more, more preferably 70% by mass in 100% by mass of the solid content of the pressure-sensitive adhesive composition. That's it. In addition, 100 mass% may be sufficient as the upper limit of the said content of a copolymer (A), and when other components are also contained in solid content, it determines with content of another component. Such an embodiment is preferable in that various adhesive properties such as holding power and tack can be arbitrarily adjusted. Solid content usually refers to components other than the solvent.
- the pressure-sensitive adhesive composition of the present invention preferably further contains a curing agent (B).
- a curing agent (B) By crosslinking the copolymer (A) and / or curing the composition with the curing agent (B), a crosslinked body and / or a cured body can be formed, and an adhesive layer excellent in heat resistance. Can be obtained.
- the pressure-sensitive adhesive composition of the present invention may be either a thermosetting system or an active energy ray curing system.
- curing agent (B) is suitably selected by the reactive functional group which can be introduce
- a crosslinking agent (B1) that can undergo a crosslinking reaction with the functional group, such as an isocyanate compound, an epoxy compound, or a metal chelate compound, can be used.
- curing agent (B) polyfunctional (meth) acrylate (B2) can also be used, for example.
- the isocyanate compound an isocyanate compound having 2 or more isocyanate groups in one molecule is usually used, and the number of isocyanate groups is preferably 2 to 8, more preferably 3 to 6.
- the number of isocyanate groups is within the above range, it is preferable from the viewpoint of the crosslinking reaction efficiency between the copolymer (A) and the isocyanate compound and the flexibility of the pressure-sensitive adhesive layer.
- diisocyanate compound having 2 isocyanate groups in one molecule examples include aliphatic diisocyanate, alicyclic diisocyanate, and aromatic diisocyanate.
- Aliphatic diisocyanates include ethylene diisocyanate, tetramethylene diisocyanate, pentamethylene diisocyanate, hexamethylene diisocyanate, 2-methyl-1,5-pentane diisocyanate, 3-methyl-1,5-pentane diisocyanate, 2,2,4-trimethyl
- aliphatic diisocyanates having 4 to 30 carbon atoms such as -1,6-hexamethylene diisocyanate.
- alicyclic diisocyanates include alicyclic rings having 7 to 30 carbon atoms such as isophorone diisocyanate, cyclopentyl diisocyanate, cyclohexyl diisocyanate, hydrogenated xylylene diisocyanate, hydrogenated tolylene diisocyanate, hydrogenated diphenylmethane diisocyanate, and hydrogenated tetramethylxylylene diisocyanate.
- Group diisocyanates are examples of alicyclic rings having 7 to 30 carbon atoms such as isophorone diisocyanate, cyclopentyl diisocyanate, cyclohexyl diisocyanate, hydrogenated xylylene diisocyanate, hydrogenated tolylene diisocyanate, hydrogenated diphenylmethane diisocyanate, and hydrogenated tetramethylxylylene diisocyanate.
- aromatic diisocyanate examples include aromatic diisocyanates having 8 to 30 carbon atoms such as phenylene diisocyanate, tolylene diisocyanate, xylylene diisocyanate, naphthylene diisocyanate, diphenyl ether diisocyanate, diphenylmethane diisocyanate, and diphenylpropane diisocyanate.
- isocyanate compound having 3 or more isocyanate groups in one molecule examples include aromatic polyisocyanate, aliphatic polyisocyanate, and alicyclic polyisocyanate. Specific examples include 2,4,6-triisocyanate toluene, 1,3,5-triisocyanate benzene, and 4,4 ', 4 "-triphenylmethane triisocyanate.
- isocyanate compound examples include multimers (for example, dimers or trimers, biurets, isocyanurates) and derivatives (for example, polyhydric alcohols) of the above isocyanate compounds having 2 or 3 isocyanate groups. And an addition reaction product of two or more molecules of a diisocyanate compound) and a polymer.
- polyhydric alcohol in the derivative examples include trivalent or higher alcohols such as trimethylolpropane, glycerin and pentaerythritol as low molecular weight polyhydric alcohols; high molecular weight polyhydric alcohols such as polyether polyols, Examples include polyester polyol, acrylic polyol, polybutadiene polyol, and polyisoprene polyol.
- isocyanate compounds include diphenylmethane diisocyanate trimer, polymethylene polyphenyl polyisocyanate, hexamethylene diisocyanate or tolylene diisocyanate biuret or isocyanurate, trimethylolpropane and tolylene diisocyanate or xylylene diisocyanate.
- Reaction product for example, a trimolecular adduct of tolylene diisocyanate or xylylene diisocyanate
- reaction product of trimethylolpropane and hexamethylene diisocyanate for example, a trimolecular adduct of hexamethylene diisocyanate
- polyether polyisocyanate for example, a polyether polyisocyanate
- Polyester polyisocyanate is mentioned.
- xylylene diisocyanate and hexamethylene diisocyanate cross-linking agents are preferable from the viewpoint of difficult yellowing, and tolylene diisocyanate cross-linking agents are preferable from the viewpoint of stress relaxation.
- the xylylene diisocyanate crosslinking agent include xylylene diisocyanate and its multimers, derivatives and polymers;
- examples of the hexamethylene diisocyanate crosslinking agent include hexamethylene diisocyanate and its multimers, derivatives and polymers.
- tolylene diisocyanate crosslinking agents include tolylene diisocyanate and its multimers, derivatives and polymers.
- Examples of the epoxy compound include compounds having two or more epoxy groups in the molecule.
- ethylene glycol diglycidyl ether polyethylene glycol diglycidyl ether, glycerin diglycidyl ether, glycerin triglycidyl ether, 1,6-hexane.
- an alkoxide, acetylacetone, ethyl acetoacetate or the like is coordinated to a polyvalent metal such as aluminum, iron, copper, zinc, tin, titanium, nickel, antimony, magnesium, vanadium, chromium, and zirconium.
- a polyvalent metal such as aluminum, iron, copper, zinc, tin, titanium, nickel, antimony, magnesium, vanadium, chromium, and zirconium.
- Compounds. Specific examples include aluminum isopropylate, aluminum secondary butyrate, aluminum ethyl acetoacetate / diisopropylate, aluminum trisethyl acetoacetate, and aluminum trisacetylacetonate.
- polyfunctional (meth) acrylate (B2) examples include di-, tri- or polyalkylene glycol-di (meth) acrylate, alkanediol di (meth) acrylate, bisphenol di (meth) acrylate, trifunctional or higher polyol poly (Meth) acrylate, polyurethane di (meth) acrylate, polyurethane poly (meth) acrylate may be mentioned.
- the curing agent (B) can be used alone or in combination of two or more.
- the curing agent (B) is usually 0.01 to 25 parts by weight, preferably 0.05 to 20 parts by weight, based on 100 parts by weight of the copolymer (A). Preferably it is contained in the range of 0.1 to 15 parts by mass.
- the crosslinking agent (B1) is preferably 0.01 to 5.0 parts by weight, more preferably 0.05 to 4 parts by weight with respect to 100 parts by weight of the copolymer (A). 0.0 part by mass, and more preferably 0.1 to 3.0 parts by mass.
- the composition comprises polyfunctional (meth) acrylate (B2), preferably 0.01 to 20 parts by weight, more preferably 100 parts by weight of copolymer (A). It is contained in the range of 0.05 to 15 parts by mass, more preferably 0.1 to 10 parts by mass. Such an embodiment is preferable because an appropriate degree of crosslinking and curing can be achieved and excellent adhesive properties can be realized.
- the pressure-sensitive adhesive composition of the present invention may further contain a photopolymerization initiator (C).
- a composition containing at least a polyfunctional (meth) acrylate (B2) as the curing agent (B) and further containing a photopolymerization initiator (C) is preferable as the active energy ray-curable pressure-sensitive adhesive composition.
- Examples of the photopolymerization initiator (C) include a benzoin ether photopolymerization initiator, an acetophenone photopolymerization initiator, a benzophenone photopolymerization initiator, a ketal photopolymerization initiator, a thioxanthone photopolymerization initiator, and an acylphosphine.
- Examples thereof include oxide photopolymerization initiators, and specific examples of these initiators include compounds listed in paragraphs [0023] to [0027] of JP-A-2009-013361.
- a photoinitiator (C) can be used individually by 1 type or in combination of 2 or more types.
- the photopolymerization initiator (C) is, for example, 0.1 to 200 parts by mass, preferably 100 parts by mass with respect to 100 parts by mass of the polyfunctional (meth) acrylate (B2). It is contained in the range of 10 to 150 parts by mass, more preferably 20 to 100 parts by mass.
- the pressure-sensitive adhesive composition of the present invention is a (meth) acrylic polymer other than the copolymer (A), a tackifier resin, a silane coupling agent, a charge, within a range not impairing the effects of the present invention.
- One or more additives selected from an inhibitor, an antioxidant, a light stabilizer, a metal corrosion inhibitor, a plasticizer, a crosslinking accelerator, a surfactant and a reworking agent may be contained.
- the pressure-sensitive adhesive composition of the present invention preferably contains an organic solvent (E) in order to adjust its applicability.
- the content of the organic solvent (E) is usually 30 to 90% by mass, preferably 40 to 90% by mass.
- an organic solvent (E) the solvent enumerated as a polymerization solvent mentioned above can be mentioned.
- the organic solvent (E) can be used alone or in combination of two or more.
- the pressure-sensitive adhesive composition of the present invention can be prepared, for example, by mixing each of the above components by a conventionally known method.
- a pressure-sensitive adhesive composition can be prepared by mixing a solution containing the copolymer (A) obtained by the synthesis of the copolymer (A) and other components.
- the pressure-sensitive adhesive sheet of the present invention has a pressure-sensitive adhesive layer formed from the pressure-sensitive adhesive composition of the present invention.
- the pressure-sensitive adhesive sheet include a double-sided pressure-sensitive adhesive sheet having only the pressure-sensitive adhesive layer, a base material, and a pressure-sensitive adhesive layer formed on both surfaces of the base material, and at least one pressure-sensitive adhesive layer is the pressure-sensitive adhesive of the present invention.
- Double-sided pressure-sensitive adhesive sheet that is a pressure-sensitive adhesive layer formed from the composition, a base material, a single-sided pressure-sensitive adhesive sheet having the pressure-sensitive adhesive layer formed on one surface of the base material, and a base in the pressure-sensitive adhesive layer of these pressure-sensitive adhesive sheets
- the thickness of the pressure-sensitive adhesive layer is usually 5 to 200 ⁇ m, preferably 10 to 100 ⁇ m, from the viewpoint of maintaining adhesive performance.
- the gel fraction of the pressure-sensitive adhesive layer is preferably 10 to 98% by mass, more preferably 20 to 95% by mass, and further preferably 30 to 90% by mass from the viewpoints of cohesive strength, adhesive strength and removability. is there.
- the copolymer (A) is cross-linked with the cross-linking agent (B1), whereby the pressure-sensitive adhesive layer is can get.
- the conditions for forming the pressure-sensitive adhesive layer are, for example, as follows.
- the pressure-sensitive adhesive composition of the present invention is applied on a substrate, a support or a cover film.
- the solvent is usually removed by drying at 50 to 150 ° C., preferably 60 to 100 ° C., usually 1 to 10 minutes, preferably 2 to 7 minutes.
- a coating film is formed as described above.
- a known thickness such as a spin coating method, a knife coating method, a roll coating method, a bar coating method, a blade coating method, a die coating method, or a gravure coating method may be used.
- the method of applying and drying can be used.
- the coating film is usually applied for 3 days or longer, preferably 7 to 10 days, usually 5 to 60 ° C., preferably 15 to 40 ° C., and usually 30 to 70% RH.
- the curing may be performed preferably in an environment of 40 to 70% RH.
- the pressure-sensitive adhesive can be obtained by irradiating the coating film with active energy rays.
- the active energy rays include ultraviolet rays, visible rays, and electron beams, and ultraviolet rays are preferable.
- the integrated light amount is usually 300 to 3000 mJ / cm 2 .
- the said aging and active energy ray irradiation in the state which clamped the said coating film with the base material, the support body, or the cover film, in order to interrupt
- Examples of the substrate, support and cover film include plastic film, foam substrate, nonwoven fabric, paper, and flat yarn cloth.
- the plastic film include polyester films such as polyethylene terephthalate; polyolefin films such as polyethylene, polypropylene, and ethylene-vinyl acetate copolymer.
- the foam base material include a foam base material obtained using an olefin resin such as polyethylene, polypropylene, an ethylene-propylene copolymer, an ethylene-vinyl acetate copolymer, and a foam obtained using polystyrene.
- a foam base material obtained using polyurethane a foam base material obtained using polyvinyl chloride, a foam base material obtained using (meth) acrylic rubber, and other elastomers
- the foam base material obtained is mentioned.
- the non-woven fabric include non-woven fabric obtained by using chemical fibers such as manila hemp, wood pulp, rayon, acetate fiber, polyester fiber, polyvinyl alcohol fiber, polyamide fiber, and a mixture of two or more thereof.
- the flat yarn cloth include a woven polyethylene flat yarn and a polypropylene yarn, and a laminate of a resin film on the surface thereof.
- the thicknesses of the substrate, the support and the cover film are not particularly limited, but are, for example, 5 to 150 ⁇ m.
- the pressure-sensitive adhesive sheet of the present invention is excellent in the balance between pressure-sensitive adhesive force and reworkability.
- the pressure-sensitive adhesive sheet of the present invention has good pressure-sensitive adhesive properties for sticking to high-polar materials and polyolefin-based low-polar materials.
- Examples of the polyolefin-based low-polarity material include polyethylene and polypropylene. Therefore, the pressure-sensitive adhesive sheet of the present invention can be widely used as an industrial pressure-sensitive adhesive sheet, and in particular, can be used for laminating nonwoven fabric double-sided tape and urethane foam, which are used inside automobiles and inside electronic devices.
- HLC-8120GPC manufactured by Tosoh Corporation
- -GPC column configuration The following five columns (all manufactured by Tosoh Corporation) (1) TSK-GEL HXL-H (guard column) (2) TSK-GEL G7000HXL (3) TSK-GEL GMHXL (4) TSK-GEL GMHXL (5) TSK-GEL G2500HXL Sample Concentration: As will be 1.0 mg / cm 3, diluting and mobile phase solvent with tetrahydrofuran: tetrahydrofuran Flow rate: 1.0 cm 3 / min -Column temperature: 40 ° C
- Example A1 In a flask equipped with a stirrer, a nitrogen gas inlet tube, a thermometer, and a reflux condenser, 90 g of methyl acrylate (MA), 10 g of acrylic acid (AA), 30 g of ethyl acetate, and 1.0 g of RAFT agent 1 shown in the following formula And the contents of the flask were heated to 80 ° C. while introducing nitrogen gas into the flask.
- MA methyl acrylate
- AA acrylic acid
- ethyl acetate ethyl acetate
- RAFT agent 1 shown in the following formula
- a flask equipped with a stirrer, a nitrogen gas inlet tube, a thermometer, and a reflux condenser is prepared, and a polymer solution containing the acrylic polymer (A ′) is prepared so that the solid content of the acrylic polymer (A ′) is 15 g. Then, 85 g of n-butyl acrylate (BA) and 50 g of ethyl acetate were charged, and the contents of the flask were heated to 80 ° C. while introducing nitrogen gas into the flask.
- BA n-butyl acrylate
- Example A2 A polymer solution containing an acrylic polymer (A2) was obtained in the same manner as in Example A1, except that 4-hydroxybutyl acrylate (4HBA) was used instead of the acrylic acid (AA) shown in Table 1.
- 4HBA 4-hydroxybutyl acrylate
- Examples B1 and B2 and Comparative Examples B1 and B2 The polymer solution obtained in Examples and the like was used as a non-crosslinking adhesive composition. Further, the polymer solutions obtained in Examples and the like, M-5A, E-50C, or L-45 (all manufactured by Soken Chemical Co., Ltd.) as the crosslinking agent, and the solid content concentration of the crosslinking agent are shown in Table 1. It mixed so that it might become the amount shown, and it diluted suitably with ethyl acetate, and obtained the adhesive composition for bridge
- the pressure-sensitive adhesive composition was applied on the surface of the polyethylene terephthalate (PET) film having a thickness of 50 ⁇ m, which had been subjected to corona treatment, using a doctor blade so that the dry film thickness was 50 ⁇ m.
- the solvent was removed by drying for 5 minutes.
- the obtained pressure-sensitive adhesive coating film was bonded to a release-treated PET separator and aged for 7 days in an environment of 23 ° C. and 65% RH to obtain a pressure-sensitive adhesive sheet.
- the PET separator was peeled off from the pressure-sensitive adhesive sheet obtained in the same manner as in Examples etc. except that it was prepared using a PET separator that had been peel-treated instead of the PET film. .1 g was collected in a sampling bottle, 30 mL of ethyl acetate was added and shaken for 4 hours, the contents of this sample bottle were filtered through a 200 mesh stainless steel wire mesh, and the residue on the wire mesh was dried at 100 ° C. for 2 hours. The dry mass was measured.
- Example B1 and Example B2 prepared from the copolymers of Example A1 and Example A2 were the same as those of Comparative Examples B1 and B2 prepared from the copolymers of Comparative Examples A1 and A2. Since the cohesive force is higher than that of the pressure-sensitive adhesive sheet, it has sufficient holding power even if it is uncrosslinked. Further, the copolymers of Example A1 and Comparative Example A1 have the same monomer composition, but when the reactive functional groups are localized as in Example A1, a pressure-sensitive adhesive sheet having excellent aging properties is obtained. It is done.
Abstract
Description
[1]式(a1)に示すRAFT剤を用いたRAFT重合により得られる(メタ)アクリル系トリブロック共重合体(A)。
本明細書において、「重合体」とは単独重合体および共重合体を包含する意味で用い、また、「重合」とは単独重合および共重合を包含する意味で用いる。また、アクリルおよびメタクリルを総称して「(メタ)アクリル」とも記載する。
本明細書において、可逆的付加開裂連鎖移動を「RAFT」とも記載する。
本発明の(メタ)アクリル系トリブロック共重合体(A)は、式(a1)に示すRAFT剤を用いたRAFT重合、具体的には少なくとも(メタ)アクリル酸エステルを含む重合性二重結合含有モノマーのRAFT重合により得られる。
式(a1)に示すRAFT剤としては、例えば、以下に示す化合物が挙げられる。
共重合体(A)は、例えば、下記式で表される。
共重合体(A)の原料モノマーは、少なくとも(メタ)アクリル酸エステルを含む重合性二重結合含有モノマーである。重合性二重結合含有モノマーとしては、例えば、下記反応性官能基を有しない(メタ)アクリル酸エステル、少なくとも1種の下記反応性官能基を有するモノマー(以下「反応性官能基含有モノマー」ともいう)、これらのモノマー以外の共重合性モノマーが挙げられる。前記反応性官能基としては、酸基、水酸基、アミノ基、アミド基、シアノ基、窒素系複素環が挙げられる。
上記反応性官能基を有しない(メタ)アクリル酸エステルの使用量は、反応性官能基含有モノマーを除く全重合性二重結合含有モノマー100質量%中、通常は70質量%以上、好ましくは80質量%以上、より好ましくは90質量%以上である。
反応性官能基含有モノマーの使用量は、全重合性二重結合含有モノマー100質量%中、通常は0.5~15質量%、好ましくは0.8~12質量%、より好ましくは1~10質量%である。カルボキシル基含有モノマーおよび水酸基含有モノマーから選ばれる少なくとも1種を用いる場合、これらの合計量が前記範囲にあることが好ましい。
共重合性モノマーは1種単独で又は2種以上を用いることができる。
RAFT重合において、式(a1)に示すRAFT剤の存在下、重合性二重結合含有モノマーを重合する。式(a1)に示すRAFT剤の使用量は、重合性二重結合含有モノマーの総量100質量部に対して、通常は0.05~20質量部、好ましくは0.05~10質量部である。このような態様であれば、反応制御が容易であり、また得られる共重合体の重量平均分子量を後述する範囲に調整することが容易である。
RAFT重合は、重合開始剤の存在下に行うことが好ましい。重合開始剤としては、例えば、通常の有機系重合開始剤が挙げられ、具体的には、過酸化ベンゾイル、過酸化ラウロイル等の過酸化物、2,2'-アゾビスイソブチロニトリル等のアゾ化合物が挙げられる。これらの中でも、アゾ化合物が好ましい。
重合開始剤の使用量は、重合性二重結合含有モノマーの総量100質量部に対して、通常は0.001~2質量部、好ましくは0.002~1質量部である。このような態様であれば、得られる共重合体の重量平均分子量を後述する範囲に調整することが容易である。
RAFT重合は、重合溶媒を使用しない塊状重合であってもよいが、RAFT重合には、必要により重合溶媒を使用してもよい。
重合溶媒は1種単独で又は2種以上を用いることができる。
本発明の共重合体(A)の製造方法は、例えば、式(a1)に示すRAFT剤を用いて、重合性二重結合含有モノマーを重合する工程1(第1のRAFT重合)と、工程1で得られた重合体に、工程1でのモノマー組成とは異なる重合性二重結合含有モノマーをさらに添加して重合する工程2(第2のRAFT重合)とを有する。工程1で用いる前記モノマーおよび工程2で添加する前記モノマーの一方または双方が(メタ)アクリル酸エステルを含み、いずれも(メタ)アクリル酸エステルを含むことが好ましい。
共重合体(A)のゲルパーミエーションクロマトグラフィー法(GPC法)により測定される重量平均分子量(Mw)は、好ましくは30,000~600,000であり、より好ましくは50,000~550,000、さらに好ましくは80,000~500,000である。このような態様であれば、粘着剤組成物に充分な凝集力が付与されるため、高温乾燥条件下や高温高湿条件下における耐久性向上の観点から好ましい。
共重合体(A)のガラス転移温度(Tg)は、好ましくは0℃未満であり、より好ましくは-70~-20℃、さらに好ましくは-60~-30℃である。Tgが前記範囲内にあると、粘着剤層の被着体に対する密着性の観点から好ましい。また、Tgが前記下限値以上であれば、粘着剤層の凝集力に優れ、耐久性向上の観点から好ましい。共重合体(A)のTgは、例えば、各モノマーの単独重合体のTgおよびFoxの式から算出することができる。各モノマーの単独重合体のTgは、例えば、Polymer Handbook Fourth Edition(Wiley-Interscience 2003)記載の値を用いることができる。
本発明の粘着剤組成物は、上述した(メタ)アクリル系トリブロック共重合体(A)を含有する。本発明の粘着剤組成物は、用途に応じて、硬化剤(B)をさらに含有することが好ましい。
(メタ)アクリル系トリブロック共重合体(A)の含有量は、粘着剤組成物の固形分100質量%中、通常は60質量%以上、好ましくは65質量%以上、より好ましくは70質量%以上である。なお、共重合体(A)の前記含有量の上限値は、100質量%であってもよく、固形分に他の成分も含まれる場合は、他の成分の含有量により決定される。このような態様であれば、保持力、タックなどの各種粘着物性を任意に調整できる点で好ましい。固形分とは、通常は溶媒以外の成分を指す。
本発明の粘着剤組成物は、硬化剤(B)をさらに含有することが好ましい。硬化剤(B)により、共重合体(A)を架橋する、及び/又は組成物を硬化させることで、架橋体及び/又は硬化体を形成することができ、耐熱性に優れた粘着剤層を得ることができる。
硬化剤(B)の種類は、共重合体(A)に導入され得る反応性官能基、および粘着剤組成物の硬化系によって適宜選択される。例えば、アクリル系共重合体(A)が反応性官能基を有する場合、イソシアネート化合物、エポキシ化合物、金属キレート化合物等の、前記官能基と架橋反応し得る架橋剤(B1)を用いることができる。また、硬化剤(B)としては、例えば、多官能(メタ)アクリレート(B2)を用いることもできる。
本発明の粘着剤組成物は、硬化剤(B)を、共重合体(A)100質量部に対して、通常は0.01~25質量部、好ましくは0.05~20質量部、より好ましくは0.1~15質量部の範囲で含有する。
本発明の粘着剤組成物は光重合開始剤(C)をさらに含有してもよい。例えば、硬化剤(B)として多官能(メタ)アクリレート(B2)を少なくとも含み、光重合開始剤(C)をさらに含む組成物は、活性エネルギー線硬化系粘着剤組成物として好ましい。
本発明の粘着剤組成物は、一実施態様において、光重合開始剤(C)を、多官能(メタ)アクリレート(B2)100質量部に対して、例えば0.1~200質量部、好ましくは10~150質量部、より好ましくは20~100質量部の範囲で含有する。
本発明の粘着剤組成物は、上記成分のほか、本発明の効果を損なわない範囲で、共重合体(A)以外の(メタ)アクリル系重合体、粘着付与樹脂、シランカップリング剤、帯電防止剤、酸化防止剤、光安定剤、金属腐食防止剤、可塑剤、架橋促進剤、界面活性剤およびリワーク剤から選択される1種または2種以上の添加剤を含有してもよい。
本発明の粘着剤組成物は、その塗布性を調整するため、有機溶媒(E)を含有することが好ましい。本発明の粘着剤組成物において、有機溶媒(E)の含有量は、通常は30~90質量%、好ましくは40~90質量%である。有機溶媒(E)としては、上述した重合溶媒として列挙した溶媒を挙げることができる。
有機溶媒(E)は1種単独で又は2種以上を用いることができる。
本発明の粘着剤組成物は、例えば、上記各成分を従来公知の方法により混合することで調製することができる。例えば、共重合体(A)の合成で得られた共重合体(A)を含む溶液と、他の成分とを混合することにより、粘着剤組成物を調製することができる。
本発明の粘着シートは、本発明の粘着剤組成物より形成された粘着剤層を有する。
粘着シートとしては、例えば、上記粘着剤層のみを有する両面粘着シート、基材と、基材の両面に形成された粘着剤層とを有し、少なくとも一方の粘着剤層が本発明の粘着剤組成物より形成された粘着剤層である両面粘着シート、基材と、基材の一方の面に形成された上記粘着剤層を有する片面粘着シート、およびこれらの粘着シートの粘着剤層における基材と接していない面に剥離処理されたカバーフィルムが貼付された粘着シートが挙げられる。
本発明の粘着シートは、粘着力およびリワーク性のバランスに優れる。
本発明の粘着シートは、高極性素材やポリオレフィン系低極性素材への貼着に良好な粘着物性を有している。ポリオレフィン系低極性素材としては、例えば、ポリエチレン、ポリプロピレンが挙げられる。したがって、本発明の粘着シートは、工業用粘着シートとして広く使用でき、特に自動車の内装や電子機器内部に用いられる、不織布両面テープやウレタンフォーム貼り合わせ用として使用することができる。
実施例における各測定値は、以下の方法により求めた。
精秤したブリキシャーレ(質量:n1)にポリマー溶液1gを入れ、合計質量(n2)を精秤した後、150℃で3時間加熱した。その後、当該ブリキシャーレを室温のデシケータ内に1時間静置し、次いで再度精秤し、加熱後の合計質量(n3)を測定した。得られた質量測定値(n1~n3)を用いて、下記式から加熱残分を算出した。
加熱残分(質量%)=
100×[加熱後質量(n3-n1)/加熱前質量(n2-n1)]
(メタ)アクリル系共重合体について、GPC法により、下記条件で標準ポリスチレン換算によるMwおよびMw/Mnを求めた。
・測定装置:HLC-8120GPC(東ソー(株)製)
・GPCカラム構成:以下の5連カラム(すべて東ソー(株)製)
(1)TSK-GEL HXL-H (ガードカラム)
(2)TSK-GEL G7000HXL
(3)TSK-GEL GMHXL
(4)TSK-GEL GMHXL
(5)TSK-GEL G2500HXL
・サンプル濃度:1.0mg/cm3となるように、テトラヒドロフランで希釈
・移動相溶媒:テトラヒドロフラン
・流量:1.0cm3/min
・カラム温度:40℃
攪拌装置、窒素ガス導入管、温度計および還流冷却管を備えたフラスコに、メチルアクリレート(MA)90g、アクリル酸(AA)10g、酢酸エチル30g、および下記式に示す1.0gのRAFT剤1を仕込み、フラスコ内に窒素ガスを導入しながらフラスコの内容物を80℃に加熱した。
以上のようにして、アクリルポリマー(A')を含むポリマー溶液を得た。得られたポリマー溶液の加熱残分は約65質量%であった。得られたポリマー溶液に含まれるアクリルポリマー(A')のMwは25,000であった。
以上のようにして、アクリルポリマー(A1)を含むポリマー溶液を得た。得られたポリマー溶液の加熱残分は約52質量%であった。得られたポリマー溶液に含まれるアクリルポリマー(A1)についてMwは17万、Mw/Mnは2.1であった。
表1記載のアクリル酸(AA)にかえて4-ヒドロキシブチルアクリレート(4HBA)を用いたこと以外は実施例A1と同様に行い、アクリルポリマー(A2)を含むポリマー溶液を得た。
攪拌装置、窒素ガス導入管、温度計および還流冷却管を備えたフラスコに、n-ブチルアクリレート(BA)85g、メチルアクリレート(MA)13.5g、アクリル酸(AA)1.5g、酢酸エチル100gを仕込み、フラスコ内に窒素ガスを導入しながらフラスコの内容物を80℃に加熱した。
表1記載のアクリル酸(AA)にかえて4-ヒドロキシブチルアクリレート(4HBA)を用いたこと以外は比較例A1と同様に行い、アクリルポリマー(RA2)を含むポリマー溶液を得た。
[実施例B1、B2および比較例B1、B2]
実施例等で得られたポリマー溶液を、未架橋用の粘着剤組成物として用いた。また、実施例等で得られたポリマー溶液と、架橋剤としてM-5A、E-50CまたはL-45(いずれも綜研化学(株)製)とを、架橋剤の固形分濃度が表1に示す量となるよう混合し、酢酸エチルで適宜希釈し、架橋用の粘着剤組成物を得た。
〔保持力試験〕
23℃かつ50%RH条件下で、実施例等で得られた粘着シートのPETセパレーターを剥がし、SUS板に露出した粘着剤層を貼り付け、2kgのローラーを3往復させて圧着した。貼付面積は20mm×20mmとした。貼付から20分後に、80℃かつ乾燥条件で未架橋系では500gの荷重を、架橋系では1kgの荷重を粘着剤層面に対して平行方向にかけ、荷重付加開始から1時間後のもとの位置からのズレの距離(mm)を測定した。また測定時間内にシートが落下した場合は落下時間を記載した。なお、E-50C添加系では前記7日間のエージング期間なしで作成したシート、前記エージング2日後、3日後のシートについても、保持力試験を行った。
実施例等で得られた粘着シートのPETセパレーターを剥がし、露出した粘着剤層のプローブタックを測定した。プローブは直径5mmでSUS製、接触時間は1秒、プローブ速度は1cm/sec、荷重は20gとした。
PETフィルムにかえて剥離処理されたPETセパレーターを用いて作製したこと以外は実施例等と同様にして得られた粘着シートからPETセパレーターを剥離し、得られた粘着剤層から、粘着剤約0.1gをサンプリング瓶に採取し、酢酸エチル30mLを加えて4時間振盪した後、このサンプル瓶の内容物を200メッシュのステンレス製金網で濾過し、金網上の残留物を100℃で2時間乾燥して乾燥質量を測定した。次式により、粘着剤のゲル分率を求めた。E-50C添加系について、前記7日間のエージング期間なしで作成したシート、前記エージング2日後、3日後のシートについて、ゲル分率を求めた。
・ゲル分率(%)=(乾燥質量/粘着剤採取質量)×100(%)
Claims (11)
- 式(a1)中のRが、炭化水素基、アシル基、アシルオキシ基またはアシルオキシアルキル基である請求項1に記載の(メタ)アクリル系トリブロック共重合体(A)。
- GPC法により測定される重量平均分子量(Mw)が30,000~600,000であり、分子量分布(Mw/Mn)が1.5~5.0である請求項1または2に記載の(メタ)アクリル系トリブロック共重合体(A)。
- ブロックA-ブロックB-ブロックAのトリブロック構造を有し、
ブロックBが-S-C(=S)-S-で表される2価の構造を有し、
共重合体(A)100質量%中、ブロックAの合計含有量が5~40質量%であり、ブロックBの含有量が95~60質量%である
請求項1~3のいずれか1項に記載の(メタ)アクリル系トリブロック共重合体(A)。 - 全構成単位100質量%中、反応性官能基含有モノマー由来の構成単位の含有量が0.5~15質量%であり、反応性官能基含有モノマー由来の全構成単位100質量%中、95質量%以上がブロックA中に存在する請求項4に記載の(メタ)アクリル系トリブロック共重合体(A)。
- 請求項1~5のいずれか1項に記載の(メタ)アクリル系トリブロック共重合体(A)を含有する粘着剤組成物。
- 硬化剤(B)をさらに含有する請求項6に記載の粘着剤組成物。
- 請求項6または7に記載の粘着剤組成物より形成された粘着剤層を有する粘着シート。
- 工程1で得られた重合体のGPC法により測定される重量平均分子量(Mw)が3,000~40,000である請求項9に記載の(メタ)アクリル系トリブロック共重合体(A)の製造方法。
- 工程1および工程2で使用されうる反応性官能基含有モノマー100質量%中、95質量%以上の前記反応性官能基含有モノマーを工程1で使用する請求項9または10に記載の(メタ)アクリル系トリブロック共重合体(A)の製造方法。
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