WO2021200404A1 - 粘着剤組成物及びその製造方法並びに粘着剤層を有する再剥離シート - Google Patents
粘着剤組成物及びその製造方法並びに粘着剤層を有する再剥離シート Download PDFInfo
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- WO2021200404A1 WO2021200404A1 PCT/JP2021/012035 JP2021012035W WO2021200404A1 WO 2021200404 A1 WO2021200404 A1 WO 2021200404A1 JP 2021012035 W JP2021012035 W JP 2021012035W WO 2021200404 A1 WO2021200404 A1 WO 2021200404A1
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- sensitive adhesive
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- 238000006366 phosphorylation reaction Methods 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229920001643 poly(ether ketone) Polymers 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 229920000768 polyamine Polymers 0.000 description 1
- 229920001083 polybutene Polymers 0.000 description 1
- 229920001707 polybutylene terephthalate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 229920002530 polyetherether ketone Polymers 0.000 description 1
- 229920001601 polyetherimide Polymers 0.000 description 1
- 229920000223 polyglycerol Polymers 0.000 description 1
- 229920001228 polyisocyanate Chemical class 0.000 description 1
- 239000005056 polyisocyanate Chemical class 0.000 description 1
- 229920002959 polymer blend Polymers 0.000 description 1
- 229920005672 polyolefin resin Polymers 0.000 description 1
- 229920000069 polyphenylene sulfide Polymers 0.000 description 1
- 239000001205 polyphosphate Substances 0.000 description 1
- 235000011176 polyphosphates Nutrition 0.000 description 1
- 229920000137 polyphosphoric acid Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 150000007519 polyprotic acids Polymers 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 239000011736 potassium bicarbonate Substances 0.000 description 1
- 229910000028 potassium bicarbonate Inorganic materials 0.000 description 1
- 235000015497 potassium bicarbonate Nutrition 0.000 description 1
- GNSKLFRGEWLPPA-UHFFFAOYSA-M potassium dihydrogen phosphate Chemical compound [K+].OP(O)([O-])=O GNSKLFRGEWLPPA-UHFFFAOYSA-M 0.000 description 1
- TYJJADVDDVDEDZ-UHFFFAOYSA-M potassium hydrogencarbonate Chemical compound [K+].OC([O-])=O TYJJADVDDVDEDZ-UHFFFAOYSA-M 0.000 description 1
- 229940086066 potassium hydrogencarbonate Drugs 0.000 description 1
- LWIHDJKSTIGBAC-UHFFFAOYSA-K potassium phosphate Substances [K+].[K+].[K+].[O-]P([O-])([O-])=O LWIHDJKSTIGBAC-UHFFFAOYSA-K 0.000 description 1
- 239000003755 preservative agent Substances 0.000 description 1
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 150000003242 quaternary ammonium salts Chemical class 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- JIYNFFGKZCOPKN-UHFFFAOYSA-N sbb061129 Chemical class O=C1OC(=O)C2C1C1C=C(C)C2C1 JIYNFFGKZCOPKN-UHFFFAOYSA-N 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229940083542 sodium Drugs 0.000 description 1
- 239000001632 sodium acetate Substances 0.000 description 1
- 235000017281 sodium acetate Nutrition 0.000 description 1
- PPASLZSBLFJQEF-RKJRWTFHSA-M sodium ascorbate Substances [Na+].OC[C@@H](O)[C@H]1OC(=O)C(O)=C1[O-] PPASLZSBLFJQEF-RKJRWTFHSA-M 0.000 description 1
- 235000010378 sodium ascorbate Nutrition 0.000 description 1
- 229960005055 sodium ascorbate Drugs 0.000 description 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
- 235000017557 sodium bicarbonate Nutrition 0.000 description 1
- AJPJDKMHJJGVTQ-UHFFFAOYSA-M sodium dihydrogen phosphate Chemical compound [Na+].OP(O)([O-])=O AJPJDKMHJJGVTQ-UHFFFAOYSA-M 0.000 description 1
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 description 1
- HLBBKKJFGFRGMU-UHFFFAOYSA-M sodium formate Chemical compound [Na+].[O-]C=O HLBBKKJFGFRGMU-UHFFFAOYSA-M 0.000 description 1
- 235000019254 sodium formate Nutrition 0.000 description 1
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 description 1
- 235000019333 sodium laurylsulphate Nutrition 0.000 description 1
- KKCBUQHMOMHUOY-UHFFFAOYSA-N sodium oxide Chemical compound [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 1
- 229910001948 sodium oxide Inorganic materials 0.000 description 1
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Substances [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 description 1
- PPASLZSBLFJQEF-RXSVEWSESA-M sodium-L-ascorbate Chemical compound [Na+].OC[C@H](O)[C@H]1OC(=O)C(O)=C1[O-] PPASLZSBLFJQEF-RXSVEWSESA-M 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 125000004079 stearyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 125000005504 styryl group Chemical group 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 125000001424 substituent group Chemical group 0.000 description 1
- 239000001384 succinic acid Substances 0.000 description 1
- AKEJUJNQAAGONA-UHFFFAOYSA-N sulfur trioxide Inorganic materials O=S(=O)=O AKEJUJNQAAGONA-UHFFFAOYSA-N 0.000 description 1
- HIFJUMGIHIZEPX-UHFFFAOYSA-N sulfuric acid;sulfur trioxide Chemical compound O=S(=O)=O.OS(O)(=O)=O HIFJUMGIHIZEPX-UHFFFAOYSA-N 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 150000003505 terpenes Chemical class 0.000 description 1
- 235000007586 terpenes Nutrition 0.000 description 1
- 150000003512 tertiary amines Chemical class 0.000 description 1
- CIHOLLKRGTVIJN-UHFFFAOYSA-N tert‐butyl hydroperoxide Chemical compound CC(C)(C)OO CIHOLLKRGTVIJN-UHFFFAOYSA-N 0.000 description 1
- 125000005063 tetradecenyl group Chemical group C(=CCCCCCCCCCCCC)* 0.000 description 1
- DLYUQMMRRRQYAE-UHFFFAOYSA-N tetraphosphorus decaoxide Chemical compound O1P(O2)(=O)OP3(=O)OP1(=O)OP2(=O)O3 DLYUQMMRRRQYAE-UHFFFAOYSA-N 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- HFRXJVQOXRXOPP-UHFFFAOYSA-N thionyl bromide Chemical compound BrS(Br)=O HFRXJVQOXRXOPP-UHFFFAOYSA-N 0.000 description 1
- HPGGPRDJHPYFRM-UHFFFAOYSA-J tin(iv) chloride Chemical compound Cl[Sn](Cl)(Cl)Cl HPGGPRDJHPYFRM-UHFFFAOYSA-J 0.000 description 1
- LDHQCZJRKDOVOX-UHFFFAOYSA-N trans-crotonic acid Natural products CC=CC(O)=O LDHQCZJRKDOVOX-UHFFFAOYSA-N 0.000 description 1
- DXNCZXXFRKPEPY-UHFFFAOYSA-N tridecanedioic acid Chemical compound OC(=O)CCCCCCCCCCCC(O)=O DXNCZXXFRKPEPY-UHFFFAOYSA-N 0.000 description 1
- 229940087291 tridecyl alcohol Drugs 0.000 description 1
- 150000003639 trimesic acids Chemical class 0.000 description 1
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 description 1
- 229910000406 trisodium phosphate Inorganic materials 0.000 description 1
- 235000019801 trisodium phosphate Nutrition 0.000 description 1
- 125000002221 trityl group Chemical group [H]C1=C([H])C([H])=C([H])C([H])=C1C([*])(C1=C(C(=C(C(=C1[H])[H])[H])[H])[H])C1=C([H])C([H])=C([H])C([H])=C1[H] 0.000 description 1
- 125000005065 undecenyl group Chemical group C(=CCCCCCCCCC)* 0.000 description 1
- 229940057402 undecyl alcohol Drugs 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
- 239000000080 wetting agent Substances 0.000 description 1
- 230000002087 whitening effect Effects 0.000 description 1
- 125000005023 xylyl group Chemical group 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J133/04—Homopolymers or copolymers of esters
-
- C—CHEMISTRY; METALLURGY
- 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
- C08F2/12—Polymerisation in non-solvents
- C08F2/16—Aqueous medium
- C08F2/22—Emulsion polymerisation
- C08F2/24—Emulsion polymerisation with the aid of emulsifying agents
-
- 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
- C08F2/12—Polymerisation in non-solvents
- C08F2/16—Aqueous medium
- C08F2/22—Emulsion polymerisation
- C08F2/24—Emulsion polymerisation with the aid of emulsifying agents
- C08F2/26—Emulsion polymerisation with the aid of emulsifying agents anionic
-
- 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
- C08F216/00—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 an alcohol, ether, aldehydo, ketonic, acetal or ketal radical
- C08F216/12—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 an alcohol, ether, aldehydo, ketonic, acetal or ketal radical by an ether radical
- C08F216/14—Monomers containing only one unsaturated aliphatic radical
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/12—Esters of monohydric alcohols or phenols
- C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
- C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/12—Esters of monohydric alcohols or phenols
- C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
- C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
- C08F220/1804—C4-(meth)acrylate, e.g. butyl (meth)acrylate, isobutyl (meth)acrylate or tert-butyl (meth)acrylate
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F283/00—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G
- C08F283/06—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polyethers, polyoxymethylenes or polyacetals
-
- 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
- C08F290/00—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups
- C08F290/02—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups on to polymers modified by introduction of unsaturated end groups
- C08F290/04—Polymers provided for in subclasses C08C or C08F
- C08F290/042—Polymers of hydrocarbons as defined in group C08F10/00
-
- 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
- C09J133/14—Homopolymers or copolymers of esters of esters containing halogen, nitrogen, sulfur or oxygen atoms in addition to the carboxy oxygen
-
- 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
- C09J151/00—Adhesives based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Adhesives based on derivatives of such polymers
- C09J151/08—Adhesives based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Adhesives based on derivatives of such polymers grafted on to macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
-
- 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
- C09J4/00—Adhesives based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; adhesives, based on monomers of macromolecular compounds of groups C09J183/00 - C09J183/16
-
- 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]
-
- 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
Definitions
- the present invention relates to a pressure-sensitive adhesive composition, a method for producing the same, and a removable sheet having a pressure-sensitive adhesive layer.
- the present invention contains a copolymer obtained by polymerizing two or more specific types of monomers containing unsaturated groups. It provides a removable sheet having a pressure-sensitive adhesive composition and a pressure-sensitive adhesive layer containing the pressure-sensitive adhesive composition.
- Adhesive sheets having an adhesive layer such as adhesive labels, masking tapes or sheets, and surface protective films are naturally excellent in adhesiveness, but after a certain period of time has passed after these are attached to the adherend. , May peel off from the adherend. At this time, a part of the pressure-sensitive adhesive layer remains on the surface of the adherend, so-called "glue residue" often occurs.
- the adherend is paper
- the base material of the adherend or the adhesive sheet may be torn when the adhesive sheet is peeled off.
- the adherend is coated paper such as art paper or cast coated paper
- the surface of the coated paper is smooth, so that the adhesive layer firmly adheres to the coated paper surface when the adhesive sheet is peeled off.
- a cross-linking agent is added as an adhesive to form an adhesive layer so that the adhesive sheet can be easily peeled off from the adherend without causing the above-mentioned problems to increase the cohesive force and reduce the adhesive force.
- Many re-peelable adhesives have been proposed.
- re-peelable pressure-sensitive adhesives are also being studied in various ways because of their strong preference for solvent-free water-based pressure-sensitive adhesives from the viewpoint of environmental hygiene in recent years.
- Patent Document 1 discloses an aqueous pressure-sensitive adhesive in which a polyglycidyl compound is mixed with an aqueous copolymer emulsion having a specific monomer composition, molecular weight, glass transition temperature and particle size.
- Patent Document 2 discloses an acrylic emulsion type pressure-sensitive adhesive in which one or more cross-linking agents selected from a polyfunctional aziridine compound and a polyfunctional carbodiimide compound are added to a specific acrylic emulsion type pressure-sensitive adhesive.
- Patent Document 3 a specific acrylic emulsion type pressure-sensitive adhesive is mixed with a specific amount of a water-soluble cross-linking agent containing an oxazoline group, the solvent-soluble content is 40% by mass or less, and the elastic modulus is 2 to 2.
- a re-peelable pressure-sensitive adhesive having a re-peelable force of 500 g / 20 mm width or less at 50 kg / cm 2 is disclosed.
- Patent Document 4 a cross-linking agent containing a carbodiimide group is added to a specific acrylic emulsion type pressure-sensitive adhesive, and the ratio of the carbodiimide group to the carboxyl group contained in the acrylic emulsion type pressure-sensitive adhesive (carbodiimide group / carboxyl group) is described.
- a water-dispersible pressure-sensitive adhesive for re-peeling which is blended so as to have a removability of 0.1 to 5.0 and has a re-peelability of 500 g / 20 mm width or less, is disclosed.
- Patent Document 5 discloses a pressure-sensitive adhesive containing (meth) acrylic acid alkyl ester as a main component, containing acrylic acid and methacrylic acid as functional monomers, and further blending a water-soluble cross-linking agent and an oil-soluble cross-linking agent. ..
- Patent Document 6 contains a (meth) acrylic acid alkyl ester unit having 4 to 12 carbon atoms of an alkyl group as a main component and 0.1 to 2.0% by mass of a carboxyl group-containing unsaturated monomer unit (a carboxyl group-containing unsaturated monomer unit).
- a water-dispersible type containing an emulsion of a meta) acrylic acid ester copolymer, an emulsion of an alkali-soluble or alkali-swellable (meth) acrylic acid copolymer containing a carboxyl group-containing unsaturated monomer unit, and a cross-linking agent as essential components.
- a removable pressure-sensitive adhesive sheet using a pressure-sensitive adhesive composition has been proposed.
- Patent Document 7 proposes a specific reactive emulsifier for improving the stability of a polymer emulsion by reducing agglomerates during emulsion polymerization.
- the present invention has sufficient adhesive holding power when used as a pressure-sensitive adhesive layer on a re-peelable sheet, can be peeled from the surface of an adherend with an appropriate peeling force, and is covered when peeled. It is an object of the present invention to provide a pressure-sensitive adhesive composition, a method for producing the same, and a re-peelable sheet capable of reducing adhesive residue on the surface of a body.
- the present invention is a group consisting of (A) at least one unsaturated compound represented by the following formula (1), (B) unsaturated carboxylic acid, and an unsaturated carboxylic acid ester compound other than the component (A).
- the present invention provides a pressure-sensitive adhesive composition containing a copolymer obtained by polymerizing at least one selected from the above.
- R 1 represents a hydrocarbon group or an acyl group having 8 to 36 carbon atoms
- a 1 and A 2 each independently represent an alkylene group having 2 to 4 carbon atoms
- L represents the following general formula ( 2) represents a group
- z represents a number from 1 to 10
- X represents a hydrogen atom or an ionic hydrophilic group
- m represents a number from 0 to 100
- n represents a number from 0 to 100. show.
- R 2 and R 3 independently represent a hydrogen atom or a methyl group, x represents a number from 0 to 12, and y represents a number of 0 or 1.
- the present invention provides a removable sheet having a pressure-sensitive adhesive layer containing the pressure-sensitive adhesive composition.
- the pressure-sensitive adhesive composition provided by the present invention has sufficient adhesive holding power when used for a re-peelable sheet, and can be peeled from the surface of an adherend with an appropriate peeling force. Since it is possible to reduce the adhesive residue on the surface of the body, it is possible to provide a removable sheet that can be suitably used for an adhesive label, a masking tape, a surface protective film, and the like.
- the pressure-sensitive adhesive composition of the present invention will be described below.
- the copolymer contained in the pressure-sensitive adhesive composition of the present invention is other than (A) at least one unsaturated compound represented by the following formula (1), (B) unsaturated carboxylic acid and (A) component. It is obtained by polymerizing at least one selected from the group consisting of unsaturated carboxylic acid ester compounds.
- the copolymer used in the present invention has a non-uniform repeating unit, and its structure and repeating are diverse. Therefore, the structure of the copolymer contained in the pressure-sensitive adhesive composition of the present invention is very complicated. Therefore, it is difficult to uniformly express the structure of the copolymer contained in the present invention by a certain general formula.
- the invention "adhesive composition" characterized by containing such a copolymer contains a copolymer obtained by polymerizing the component (A) and the component (B). It is defined by the description that specifies the copolymer by the production method.
- R 1 represents a hydrocarbon group or an acyl group having 8 to 36 carbon atoms
- a 1 and A 2 each independently represent an alkylene group having 2 to 4 carbon atoms
- L represents the following general formula ( 2) represents a group
- z represents a number from 1 to 10
- X represents a hydrogen atom or an ionic hydrophilic group
- m represents a number from 0 to 100
- n represents a number from 0 to 100. show.
- R 2 and R 3 independently represent a hydrogen atom or a methyl group, x represents a number from 0 to 12, and y represents a number of 0 or 1.
- the component (A) constituting the pressure-sensitive adhesive composition of the present invention is represented by the above formula (1).
- the hydrocarbon group having 8 to 36 carbon atoms represented by R 1 an alkyl group, an alkenyl group and an aryl group are preferable.
- the alkyl group is, for example, a linear or branched alkyl group, such as an octyl group, an isooctyl group, a 2-ethylhexyl group, a secondary octyl group, a nonyl group, an isononyl group, a secondary nonyl group, a decyl group, or an isodecyl group.
- a linear or branched alkyl group such as an octyl group, an isooctyl group, a 2-ethylhexyl group, a secondary octyl group, a nonyl group, an isononyl group, a secondary nonyl group, a decyl group, or an isodecyl group.
- alkenyl group examples include an octenyl group, a nonenyl group, a decenyl group, an undecenyl group, a dodecenyl group, a tetradecenyl group, an oleyl group and the like.
- aryl group examples include a xylyl group, a cumenyl group, a styryl group, a trityl group, an ethylphenyl group, a propylphenyl group, a butylphenyl group, a pentylphenyl group, a hexylphenyl group, a heptylphenyl group, an octylphenyl group and a nonylphenyl group.
- Examples thereof include a group, a decylphenyl group, an undecylphenyl group, a dodecylphenyl group, a tridecylphenyl group, and a tetradecylphenyl group.
- a branched aliphatic acyl group is preferable.
- the branched aliphatic acyl group is a residue of the corresponding branched fatty acid.
- Branched fatty acids include isooctanoic acid, 2-ethylhexanoic acid, neooctanoic acid, isononanoic acid, 3,4,4-trimethylhexanoic acid, neononanoic acid, isodecanoic acid, 2-propylheptanic acid, neodecanoic acid, isoundecanoic acid, isododecane.
- Having an aliphatic group having these branches is preferable because it is excellent in polymerization stability when producing a copolymer and in stability of a pressure-sensitive adhesive composition obtained from the copolymer.
- an alkyl group having 8 to 36 carbon atoms is preferable, an alkyl group having 8 to 24 carbon atoms is more preferable, an alkyl group having 10 to 14 carbon atoms is further preferable, and branching is performed at 11 to 13 carbon atoms. Alkyl groups having are most preferable.
- the chain length of the alkyl group represented by R 1 is preferably mixed in the range of 8 to 36 carbon atoms.
- Examples of the alkylene group having 2 to 4 carbon atoms represented by A 1 and A 2 of the general formula (1) include groups such as ethylene, propylene, isopropylene, butylene, isobutylene, and second butylene, and (A).
- 1 O) n and (A 2 O) m may be the same or different, and more than one kind in each of (A 1 O) n and (A 2 O) m , respectively. It may be a combination of alkylene groups at random or in blocks.
- m and n are independently numbers 0 to 100, preferably 1 to 80, more preferably 2 to 50, and even more preferably 3 to 20.
- a 1 O and A 2 O are each a single group or two or more kinds of groups, it is preferable that an ethylene group is present, and the ethylene group is based on the total molar amount of A 1 O and A 2 O. If the ratio is less than 50 mol%, the stability of the polymer emulsion may decrease. Therefore, the ratio of the ethylene groups is preferably 50 to 100 mol%, more preferably 60 to 100 mol%, and 80 to 80 to 80 to 100 mol%. 100 mol% is more preferable, and 100 mol% is most preferable.
- L is represented by the following general formula (2).
- R 2 and R 3 independently represent a hydrogen atom or a methyl group, x represents a number from 0 to 12, and y represents a number of 0 or 1.
- x is preferably a number of 1 to 8, more preferably 1 to 5, still more preferably 1 to 3, and most preferably 1. Further, it is preferable that y is 0 because the reactivity is appropriately suppressed and the copolymer can be efficiently obtained by using the one in which y is 0.
- the ionic hydrophilic group represented by X in the general formula (1) is an anionic hydrophilic group, -SO 3 M, -R 4- SO 3 M, -R 5- COOM, -PO 3 M 2 , -PO 3 MH or -CO-R 6- COMM
- M is a hydrogen atom, an alkali metal atom, an alkaline earth metal atom [However, since the alkaline earth metal atom is usually divalent, 1 / 2 mol corresponds to M], represents a quaternary ammonium cation, R 4 and R 5 represent an alkylene group having 1 to 6 carbon atoms, and R 6 represents a divalent hydrocarbon group having 1 to 12 carbon atoms. ) Is preferable.
- examples of the alkali metal atom represented by M include lithium, sodium and potassium, and examples of the alkaline earth metal atom include magnesium and calcium.
- examples of the quaternary ammonium cation include quaternary ammonium cations derived from ammonia, alkylamines and alkanolamines.
- alkylene group having 1 to 6 carbon atoms represented by R 4 and R 5 in the formula representing the anionic hydrophilic group examples include methylene, ethylene, propylene, butylene, pentane, pentamethylene, and hexamethylene. Be done.
- R 6 represents a divalent hydrocarbon group having 1 to 12 carbon atoms, and is preferably a residue obtained by removing two carboxyl groups from the dibasic acid. ..
- the dibasic acid include malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, undecanedioic acid, dodecanedioic acid, tridecanedioic acid, and tetradecanedioic acid.
- Saturated aliphatic dicarboxylic acid such as saturated aliphatic dicarboxylic acid, cyclopentanedicarboxylic acid, hexahydrophthalic acid, methylhexahydrophthalic acid, phthalic acid, isophthalic acid, terephthalic acid, tolylene carboxylic acid, xylylene dicarboxylic acid, etc.
- Unsaturated aliphatic dicarboxylic acids such as aromatic dicarboxylic acids, maleic acids, fumaric acids, itaconic acids, citraconic acids, and mesaconic acids, tetrahydrophthalic acids, methyltetrahydrophthalic acids, nagic acids (endomethylenetetrahydrophthalic acids), methylnadic acids.
- An unsaturated alicyclic dicarboxylic acid such as methylbutenyltetrahydrophthalic acid and methylpentenyltetrahydrophthalic acid.
- the group represented by -SO 3 M, -PO 3 M 2 or -PO 3 MH is preferable, and -SO 3 M is more preferable.
- M is preferably an alkali metal or a quaternary ammonium, and more preferably a quaternary ammonium.
- z represents 1 to 10, but depending on the method for producing the component (A), it may be a mixture of compounds having different z. In the case of a mixture, z represents an average value. z is preferably a number of 1 to 8, particularly preferably a number of 1 to 5, and most preferably a number of 1 to 3.
- the method for producing the component (A) of the present invention is not particularly limited.
- a method for synthesizing a compound in which X corresponds to a hydrogen atom for example, a glycidyl ether having an unsaturated hydrocarbon group is used. It can be obtained by adding an alkylene oxide or the like to a reaction product of alcohol or alcohol alkoxylate by a known method.
- examples of the glycidyl ether having an unsaturated hydrocarbon group used in the production of the component (A) include allyl glycidyl ether, acrylic glycidyl ether, methacryl glycidyl ether and the like, and examples of the alcohol include linear and linear alcohols. Branched octanol, 2-ethylhexanol, secondary octanol, linear and branched nonyl alcohols, secondary nonyl alcohols, linear and branched decyl alcohols, secondary decyl alcohols, linear and branched undecyl alcohols, secondary.
- Undecyl alcohols linear and branched dodecyl alcohols, secondary dodecyl alcohols, linear and branched tridecyl alcohols, secondary tridecyl alcohols, linear and branched tetradecyl alcohols, secondary tetradecyl alcohols, linear and Branched hexadecyl alcohol, secondary hexadecyl alcohol, linear and branched stearyl alcohol, linear and branched ecocil alcohol, 2-butyl octyl alcohol, 2-butyl decyl alcohol, 2-hexyl octyl alcohol, 2-hexyl Examples thereof include decyl alcohol, 2-octyl decyl alcohol, 2-hexyldo decyl alcohol, 2-octyldo decyl alcohol, monomethyl branched-isostearyl alcohol and the like.
- a catalyst can be used for the ring-opening reaction of glycidyl ether (epoxy), if necessary.
- the catalyst that can be used is not particularly limited as long as it is used for the ring-opening reaction of epoxy, and for example, a tertiary amine, a quaternary ammonium salt, boron trifluoride or an ether complex salt thereof, aluminum chloride, barium oxide, and water. Examples thereof include sodium oxide and potassium hydroxide.
- a compound in which X in the general formula (1) is represented by -SO 3 M, -R 4- SO 3 M, -R 5- COOM, -PO 3 M 2 , -CO-R 6-COOM.
- the method is not limited, but can be produced by reacting a compound in which X corresponds to a hydrogen atom in the general formula (1) with an ionic hydrophilic agent.
- the reaction conditions are not particularly limited, but usually, the temperature is room temperature to 150 ° C., the pressure is pressurized to about normal pressure to 0.5 MPa, and the reaction time is about 1 to 10 hours. If necessary, a catalyst such as urea may be used.
- M is a hydrogen atom
- neutralization may be performed with an alkali such as sodium hydroxide or potassium hydroxide, ammonia, an alkylamine or a monoethanolamine, an alkanolamine such as diethanolamine, or the like.
- X is the ionic hydrophilizing agents to introduce an anionic hydrophilic group represented by -R 4 -SO 3 M, for example, propane sultone, butane sultone and the like.
- Examples of the ionic hydrophilic agent that introduces an anionic hydrophilic group in which X is represented by -R 5- COM are chloroacetic acid (R 5 corresponds to a methylene group) and chloropropionic acid (R 5 becomes an ethylene group). Equivalent) or salts of these can be used.
- ionic hydrophilic agent into which an anionic hydrophilic group in which X is represented by -CO-R 6- COOM is introduced, for example, maleic acid, phthalic acid, salts thereof and the like can be used.
- Examples of the ionic hydrophilic agent into which X introduces an anionic hydrophilic group represented by -PO 3 M 2 or -PO 3 MH include diphosphorus pentoxide, polyphosphoric acid, orthophosphoric acid, and phosphorus oxychloride. Can be used. In the case of phosphorylation, a monoester type compound and a diester type compound are obtained as a mixture, and these may be separated, or if separation is difficult, they may be used as they are as a mixture.
- the ionic hydrophilic group represented by X in the general formula (1) is a cationic hydrophilic group, for example, -R 7- NR 8 R 9 R 10 ⁇ Y or -Z-NR 8 R 9
- examples include groups represented by R 10 and Y.
- Y represents a halogen atom or a methyl sulfate group (-CH 3 SO 4 ).
- the halogen atom include a chlorine atom, a bromine atom and an iodine atom.
- R 7 represents an alkylene group having 1 to 6 carbon atoms. Examples of the alkylene group having 1 to 6 carbon atoms include the same alkylene group as that mentioned in R 4 of the above anionic hydrophilic group.
- R 8 , R 9 and R 10 independently represent an alkyl group having 1 to 4 carbon atoms and an alkanol group or a benzyl group having 2 to 4 carbon atoms, respectively.
- the alkyl group having 1 to 4 carbon atoms include a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, an isobutyl group, a secondary butyl group, a tertiary butyl group and the like.
- Examples of the alkanol group having 2 to 4 carbon atoms include a 2-hydroxyethyl group, a 2-hydroxypropyl group and a 2-hydroxybutyl group.
- Z is a group represented by -CH 2 CH (OH) CH 2- or -CH (CH 2 OH) CH 2-.
- X introduces a cationic hydrophilic group represented by -R 7- NR 8 R 9 R 10 ⁇ Y
- X is a hydrogen atom by a halogenating agent such as thionyl chloride, thionyl bromide, or phosgene. It can be introduced by halogenating the hydroxyl group of the compound represented by the general formula (1) and then reacting with a tertiary amine compound. Further, after reacting the secondary amine compound instead of the tertiary amine compound, an alkyl halide, dimethyl sulfate or the like may be reacted.
- a halogenating agent such as thionyl chloride, thionyl bromide, or phosgene. It can be introduced by halogenating the hydroxyl group of the compound represented by the general formula (1) and then reacting with a tertiary amine compound. Further, after reacting the secondary amine compound instead of the tertiary amine
- the reaction conditions for halogenating a hydroxyl group are not particularly limited, but usually, the temperature is room temperature to 100 ° C., the pressure is pressurized to about normal pressure to 0.5 MPa, and the reaction time is about 1 to 10 hours.
- the reaction conditions for amination are not particularly limited, but usually the temperature is room temperature to 150 ° C., the pressure is normal pressure to 0.5 MPa, and the reaction time is about 1 to 10 hours.
- an alkali such as sodium hydroxide or potassium hydroxide may be used as a catalyst.
- X introduces a cationic hydrophilic group represented by ⁇ Z—NR 8 R 9 R 10 ⁇ Y
- epichlorohydrin such as epichlorohydrin and epibromohydrin
- X is a hydrogen atom. It can be introduced by reacting with the compound represented by the general formula (1) and then further reacting with a tertiary amine compound. Further, after reacting the secondary amine compound instead of the tertiary amine compound, an alkyl halide, dimethyl sulfate or the like may be reacted.
- the reaction conditions for reacting epihalohydrin are not particularly limited, but usually the temperature is room temperature to 100 ° C., the pressure is pressurized to about normal pressure to 0.3 MPa, and the reaction time is about 1 to 10 hours. If necessary, an alkaline catalyst such as sodium hydroxide or potassium hydroxide, or an acid catalyst such as sulfuric acid, phosphoric acid, iron chloride, boron fluoride or tin chloride may be used.
- the reaction conditions for amination are not particularly limited, but usually the temperature is room temperature to 150 ° C., the pressure is normal pressure to 0.5 MPa, and the reaction time is about 1 to 10 hours. If necessary, an alkali such as sodium hydroxide or potassium hydroxide may be used as a catalyst.
- the component (B) constituting the pressure-sensitive adhesive composition of the present invention is at least one selected from the group consisting of unsaturated carboxylic acids and unsaturated carboxylic acid ester compounds other than the component (A).
- unsaturated carboxylic acid include ethylenically unsaturated monocarboxylic acids such as acrylic acid, methacrylic acid and crotonic acid; and ethylenically unsaturated dicarboxylic acids such as fumaric acid, itaconic acid, maleic acid and citraconic acid; 2- Examples thereof include carboxylethyl acrylate and 2-carboxyethyl methacrylate.
- the ester compound of unsaturated carboxylic acid is a compound having a structure obtained by reacting the unsaturated carboxylic acid with alcohols, and examples of the alcohols include methanol, ethanol, propanol, isopropanol and butanol.
- the unsaturated carboxylic acid or its ester compound can be used alone, but the adhesiveness can also be adjusted by combining two or more of them.
- acrylic acid methacrylic acid, and ester compounds thereof.
- butyl acrylate, butyl methacrylate, pentyl acrylate, pentyl methacrylate, hexyl acrylate, hexyl methacrylate, heptyl acrylate, heptyl methacrylate, 2-ethylhexyl acrylate, and 2-ethylhexyl methacrylate are preferable, and butyl acrylate, butyl methacrylate, and 2-ethylhexyl are preferable.
- Acrylate and 2-ethylhexyl methacrylate are more preferable, and 2-ethylhexyl acrylate and 2-ethylhexyl methacrylate are further preferable.
- the mixing ratio of the component (A) and the component (B) is not particularly limited as long as the effect of the present invention is obtained, but it is preferably 10 parts by mass to 200 parts by mass, preferably 20 parts by mass to 1 part by mass with respect to 1 part by mass of the component (A). It is more preferably 150 parts by mass, and particularly preferably 30 parts by mass to 100 parts by mass.
- an unsaturated carboxylic acid ester having two or more unsaturated bonds obtained from a polyhydric alcohol and an unsaturated carboxylic acid as an internal cross-linking agent the cohesive force of the pressure-sensitive adhesive composition is improved, and the adhesive composition is used as a re-peelable sheet. If so, it can be peeled off from the surface of the adherend with an appropriate peeling force.
- the unsaturated carboxylic acid ester having two or more unsaturated bonds include (poly) ethylene glycol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, and trimethylolpropane tri (meth) acrylate. , Methylenebisacrylamide, divinylbenzene and the like.
- the present invention is a pressure-sensitive adhesive composition containing a copolymer obtained by polymerizing the component (A) and the component (B), but other reactive unsaturated compounds are used as monomer components of the copolymer. Can be used.
- the other unsaturated compound examples include styrene, dichlorostyrene, chloromethylstyrene, methylstyrene, acrylamide, acrylonitrile, butadiene, maleine nitrile and the like.
- the other unsaturated compound is preferably 0 parts by mass to 100 parts by mass, and 0 parts by mass to 70 parts by mass with respect to 100 parts by mass of the copolymer used in the present invention. Is more preferable.
- the glass transition temperature (Tg) of the copolymer of the present invention is preferably 0 ° C. or lower, particularly preferably ⁇ 20 to -60 ° C.
- Tg glass transition temperature
- the glass transition temperature (Tg) is high, excellent adhesive properties cannot be obtained, and when used as a pressure-sensitive adhesive layer on a re-peelable sheet, the penetration into the sheet substrate also decreases, and good peelability can be obtained. There is a risk that it will not be.
- the glass transition temperature is too low, the adhesive strength tends to decrease.
- a method for producing a copolymer obtained from the component (A) and the component (B) is to add water, a polymerization initiator, and, if necessary, a monomer mixture (hereinafter, also referred to as “monomer mixture”) to the above-mentioned monomer mixture. It can be produced by adding an emulsifier or the like and carrying out a polymerization reaction. Since the compound represented by the general formula (1) may also act as an emulsifier, other emulsifiers may not be required.
- an anionic emulsifier or a nonionic emulsifier is preferable from the viewpoint of improving the stability of the emulsion and improving the stability during the production and coating of the pressure-sensitive adhesive composition, and the anion is preferable.
- System emulsifiers are more preferred.
- the anionic emulsifier include sodium lauryl sulfate, ammonium lauryl sulfate, sodium dodecylbenzene sulfonate, sodium polyoxyethylene alkyl ether sulfate, sodium polyoxyethylene alkyl phenyl ether sulfate and the like.
- the nonionic emulsifier include polyoxyethylene alkyl ether and polyoxyethylene alkyl phenyl ether.
- the emulsifier is not essential because the unsaturated compound represented by the formula (1) used in the present invention acts as an emulsifier, and is optional, but used.
- the amount added is preferably 0 to 12 parts by mass, more preferably 0 to 8 parts by mass, and further preferably 0 to 6 parts by mass with respect to 100 parts by mass of the monomer mixture. Even if the amount of the emulsifier added is 0 parts by mass, the emulsion polymerization can proceed stably.
- the emulsifier may be added directly to a solution of water added to the monomer mixture, may be added to the reaction vessel in advance, or these may be used in combination.
- the polymerization initiator that can be used here is not particularly limited, and may be either water-soluble or oil-soluble.
- Specific polymerization initiators include, for example, azo compounds such as 2,2'-azobis (2-methylpropionamidine) dihydrochloride, 2,2'-azobis (2-amidinopropane) dihydrochloride, and persulfate.
- persulfates such as potassium, sodium persulfate and ammonium persulfate, peroxides such as benzoyl peroxide, t-butyl hydroperoxide and hydrogen peroxide.
- a redox initiator composed of a combination of persulfate and sodium bisulfite, a combination of a peracid substance and sodium ascorbate, or the like may be used.
- These polymerization initiators may be used alone or in combination of two or more.
- a persulfate or a redox initiator is preferable from the viewpoint of excellent polymerization stability.
- the amount of the polymerization initiator added is preferably 0.01 to 6 parts by mass, more preferably 0.03 to 4 parts by mass, and further preferably 0.03 to 4 parts by mass with respect to 100 parts by mass of the monomer mixture from the viewpoint of accelerating the polymerization rate. It is 0.1 to 2 parts by mass.
- the polymerization initiator may be added in advance in the reaction vessel, may be added immediately before the start of polymerization, or may be added in a plurality of times after the start of polymerization. It may also be added in advance to the monomer mixture. Upon addition, the polymerization initiator may be separately dissolved in a solvent or a monomer mixture and added, or the dissolved polymerization initiator may be further emulsified and added.
- a chain transfer agent or a pH buffer may be further added at the time of polymerization.
- the chain transfer agent include decanethiol, lauryl mercaptan, glycidyl mercaptan, mercaptoacetic acid, 2-mercaptoethanol, thioglycolic acid, 2-ethylhexyl thioglycolate, 2,3-dimercapto-1-propanol and the like.
- the pH buffering agent is not particularly limited as long as it is a compound having a pH buffering action, and is, for example, sodium hydrogen carbonate, potassium hydrogen carbonate, monosodium phosphate, monopotassium phosphate, disodium phosphate, trisodium phosphate. , Sodium acetate, ammonium acetate, sodium formate, ammonium formate and the like.
- Ion-exchanged water is preferable as the water used in the polymerization.
- the amount of water used is preferably 30 to 400 parts by mass, more preferably 35 to 200 parts by mass, and further preferably 40 to 150 parts by mass with respect to 100 parts by weight of the monomer mixture.
- the amount of water used is 30 parts by mass or more, the viscosity of the obtained copolymer emulsion can be in an appropriate range.
- the polymerization stability is also good.
- the solid content concentration of the obtained copolymer emulsion can be in an appropriate range, and when it is applied on a base material constituting a removable sheet to form a coating film. The formability of the coating film is improved.
- the copolymer constituting the pressure-sensitive adhesive composition of the present invention is synthesized by advancing emulsion polymerization by adding a polymerization initiator to the above-mentioned monomer mixture in the presence of an emulsifier, if necessary. Can be done.
- Examples of the procedure for carrying out the emulsion polymerization include the following methods (1) to (3), and the method (2) or (3) is preferable from the viewpoint of easy control of the polymerization temperature. , (3) is more preferable.
- (1) The monomer mixture is placed in a reaction vessel, the temperature is raised, and a polymerization initiator dissolved in water or a solvent is added dropwise or dividedly to polymerize.
- the polymerization conditions in the above polymerization method are not particularly limited, but are preferably carried out under the following conditions.
- the temperature range is preferably 40 to 100 ° C.
- the polymerization reaction is preferably carried out in about 1 to 8 hours.
- 1 to 50% by mass of the monomer mixture is polymerized at 40 to 90 ° C. for 0.1 to 4 hours, and then the remaining monomer mixture is added dropwise over about 1 to 5 hours. Alternatively, it is preferably added in portions and then aged at the same temperature for about 1 to 3 hours.
- the temperature of the polymerization initiator dissolved in water is preferably raised to 40 to 90 ° C., and the entire amount of the emulsion consisting of the monomer mixture and water is added dropwise or divided over about 2 to 5 hours. It is preferable to add it. After that, it is preferable to ripen at the same temperature for 1 to 5 hours.
- an emulsifier (or a part of the emulsifier) is dissolved in the monomer mixture, or an O / W type emulsion is prepared in advance. It is preferable to keep it in the state of.
- an alkaline aqueous solution such as aqueous ammonia, various water-soluble amines, an aqueous sodium hydroxide solution, and an aqueous potassium hydroxide solution is further added to pH 5-9, preferably pH 6-. It may be adjusted to 8.5.
- the above alkaline aqueous solution it is preferable to add the above alkaline aqueous solution to adjust the pH within the above range.
- the alkaline aqueous solution can be added during or after the polymerization, but from the viewpoint of polymerization stability and the viscosity stability of the obtained emulsion over time, a part or all of the alkaline aqueous solution is cooled to room temperature at the aging stage during the polymerization. Is preferably added.
- the solid content concentration in the emulsion or solution of the copolymer obtained from the components (A) and (B) of the present invention and other unsaturated compounds is preferably 10 to 80% by mass, more preferably 25 to 25. It is 70% by mass.
- the viscosity of the copolymer emulsion at 25 ° C. is preferably 30 to 400 mPa ⁇ s, more preferably 50 to 300 mPa ⁇ s.
- the average particle size of the copolymer emulsion is preferably 100 to 900 nm, more preferably 200 to 600 nm.
- the average particle size referred to here is measured by the dynamic light scattering method.
- the pressure-sensitive adhesive composition of the present invention may contain a cross-linking agent together with the above-mentioned copolymer.
- the cross-linking agent is a compound that reacts with a carboxyl group that may exist in the copolymer to cross-link.
- examples of the cross-linking agent include hydrazines such as epoxy compounds, oxazoline compounds, carbodiimide compounds, aziridine compounds, polyisocyanate compounds, melamine compounds, metal complex compounds, amine compounds, adipic acid dihydrazide, and sebacic acid dihydrazide. Examples include derivatives.
- These cross-linking agents may be used alone or in combination of two or more.
- the adhesiveness between the base material and the pressure-sensitive adhesive layer when used for the re-peelable sheet the peelability from the adherend, and the effect of suppressing an increase in the adhesive strength with time after being attached to the adherend.
- at least one selected from the group consisting of epoxy compounds, oxazoline compounds, and carbodiimide compounds is preferable, and epoxy compounds are more preferable.
- the epoxy compound a compound having two or more epoxy groups or glycidyl groups in the molecule is preferable.
- the epoxy compound include polyglycidyl ether compounds of mononuclear polyvalent phenol compounds such as hydroquinone, resorcin, pyrocatechol, and fluoroglucosinol; dihydroxynaphthalene, biphenol, methylenebisphenol (bisphenol F), and methylenebis (orthocresol).
- Echiliden bisphenol isopropyridene bisphenol (bisphenol A), isopropyridene bis (orthocresol), tetrabromobisphenol A, 1,3-bis (4-hydroxycumylbenzene), 1,4-bis (4-hydroxyc) Milbenzene), 1,1,3-tris (4-hydroxyphenyl) butane, 1,1,2,2-tetra (4-hydroxyphenyl) ethane, thiobisphenol, sulfobisphenol, oxybisphenol, phenol novolac, orthocresol Polyglycidyl ether compounds of polynuclear polyvalent phenolic compounds such as novolak, ethylphenol novolak, butylphenol novolak, octylphenol novolak, resorcin novolak, terpenphenol; ethylene glycol, propylene glycol, butylene glycol, hexanediol, polyethylene glycol, polypropylene glycol, thiog
- epoxy resins are internally crosslinked with a prepolymer of terminal isocyanate, or have a high molecular weight with a polyvalent active hydrogen compound (polyvalent phenol, polyamine, carbonyl group-containing compound, polyphosphate ester, etc.). But it may be.
- a polyvalent active hydrogen compound polyvalent phenol, polyamine, carbonyl group-containing compound, polyphosphate ester, etc.
- the epoxy compound can also be used as the epoxy compound.
- the commercially available product include bisphenol A / epichlorohydrin type epoxy resin and sorbitol polyglycidyl ether (as commercial products, for example, trade names "Denacol EX-611" and "Denacol EX-612” manufactured by Nagase ChemteX Corporation.
- Examples thereof include -m-xylene diamine, 1,3-bis (N, N'-diglycidylaminomethyl) cyclohexane and the like.
- an aqueous type cross-linking agent is preferable, and glycerol polyglycidyl ether is more preferable.
- oxazoline-based compound a compound having two or more oxazoline groups in the molecule is preferable.
- examples of such an oxazoline-based compound include addition-polymerizable 2-oxazoline (for example, 2-isopropenyl-2-oxazoline) having a substituent having an unsaturated carbon-carbon bond at the carbon position at the 2-position and other non-oxazolines.
- Examples thereof include a copolymer with a saturated monomer.
- the copolymer include "Epocross WS-500", “Epocross WS-700", “Epocross K-2010E”, “Epocross K-2020E", and "Epocross K-2030E” (trade names, all in Japan). (Manufactured by Catalyst Co., Ltd.) and the like.
- carbodiimide-based compound a compound having two or more carbodiimide groups in the molecule is preferable.
- carbodiimide compounds include “carbodilite V-02”, “carbodilite V-02-L2”, “carbodilite V-04”, “carbodilite V-06”, “carbodilite E-01”, and “carbodilite E”.
- -02 “ Carbodilite E-04 ”(both trade names, manufactured by Nisshinbo) and the like.
- the pressure-sensitive adhesive composition of the present invention may contain other additives as long as the effects of the present invention are not impaired.
- other additives include (polymerized) rosin-based resins, (polymerized) rosin-based resins, terpene-based resins, tackifier resins such as terpenephenol-based resins, adipic acid diesters, fumaric acid diesters, and sebacic acid.
- Plasticizers such as diesters, succinic acid dialkyl ester sulfonates, silicone-based surfactants, fluorine-based surfactants, acetylenediol-based surfactants and other wetting agents, softeners, fillers, pigments, dyes, anti-aging Examples include agents, thickeners, antifoaming agents, preservatives and the like.
- the preferred range of the physical property values of the pressure-sensitive adhesive composition of the present invention is as follows.
- the following physical property values mean values measured by the method described in Examples.
- the gel fraction when the pressure-sensitive adhesive composition of the present invention is applied to a substrate, dried and then dissolved in acetone is 20 to 90% by mass, preferably 30 to 90% by mass, from the viewpoint of the peeling power of the pressure-sensitive adhesive composition. It is 70% by mass.
- the viscosity of the pressure-sensitive adhesive composition of the present invention at 25 ° C. is preferably 500 mPa ⁇ s or less, more preferably 100 to 500 mPa ⁇ s, more preferably 130 to 400 mPa ⁇ s, still more preferably, from the viewpoint of supporting high-speed coating. It is 160 to 350 mPa ⁇ s, more preferably 180 to 320 mPa ⁇ s.
- the viscosity is 500 mPa ⁇ s or less, high-speed coating can be supported. Further, if the viscosity is 100 mPa ⁇ s or less, the coating film may be repelled.
- the removable sheet of the present invention has, for example, a pressure-sensitive adhesive layer made of the above-mentioned pressure-sensitive adhesive composition of the present invention on one side or both sides of a sheet-like base material.
- the re-peelable sheet is a sheet that can be peeled off after a certain period of time after being attached to the surface of an adherend such as paper, plastic, or metal, and the re-peelable sheet itself can be reused. Is also included.
- the re-peelable sheet also includes a re-peelable tape, a re-peelable label, and the like.
- a re-peelable sheet having an adhesive layer on one side of the sheet-like base material will be described here, the re-peelable sheet may have adhesive layers on both sides of the sheet-like base material, and the pressure-sensitive adhesive layer itself is a re-peelable sheet. It is also included in the scope of the present invention when it is used as.
- the thickness of the pressure-sensitive adhesive layer of the removable sheet is preferably 5 to 100 ⁇ m, more preferably 10 to 60 ⁇ m, and even more preferably 15 to 40 ⁇ m. If the thickness of the pressure-sensitive adhesive layer is 5 ⁇ m or more, sufficient adhesive performance can be obtained, and if it is 100 ⁇ m or less, the pressure-sensitive adhesive layer can be prevented from protruding.
- the sheet-like base material in the removable sheet is not particularly limited as long as it is a material to which the pressure-sensitive adhesive layer made of the pressure-sensitive adhesive composition of the present invention can be firmly adhered, and for example, polyethylene terephthalate and polybutylene terephthalate.
- the thickness of the sheet-like base material is appropriately selected depending on the type of base material used, but is preferably 5 to 300 ⁇ m, more preferably 10 to 150 ⁇ m.
- the thickness of the removable sheet is not particularly limited, but is preferably 5 to 300 ⁇ m, more preferably 10 to 200 ⁇ m.
- the thickness of the removable sheet is preferably 10 to 100 ⁇ m.
- the removable sheet of the present invention can be obtained by applying the pressure-sensitive adhesive composition of the present invention to the surface of a sheet-like substrate and drying it to form a pressure-sensitive adhesive layer.
- a known method can be used, for example, a gravure coating method, a bar coating method, a spray coating method, a roll coating method, or a die coating method. , Knife coat method, air knife coat method, lip coat method, curtain coat method and the like.
- the drying conditions of the formed coating film depend on the drying ability of the coating machine, but it is preferable to heat and dry at a temperature of about 80 ° C. to 150 ° C. for about 5 seconds to 10 minutes. Through this drying step, an adhesive layer is formed on the surface of the sheet-like substrate.
- Example 1 80 g of 2-ethylhexyl acrylate, 116 g of butyl acrylate, and 4 g of acrylic acid were mixed as the monomer of the component (B) to prepare a mixed monomer solution. 200 g of the mixed monomer solution, 3.4 g of the following compound (a) and 56 g of ion-exchanged water as the monomer of the component (A), and 0.4 g of ammonium persulfate as the polymerization initiator are mixed by shaking and the mixed monomer emulsion for dropping is added. A liquid (monomer mixture) was prepared.
- Example 2 and 3 The amount (g) of decanethiol shown in Table 1 as a chain transfer agent was added to and mixed with the mixed monomer emulsion on the dropping funnel side, and then synthesized under the same conditions as in Example 1 except that the decanethiol was added dropwise.
- Example 4 It was synthesized under the same conditions as in Example 2 to which a chain transfer agent was added, except that the following compound (b) was used instead of the compound (a).
- Example 5 It was synthesized under the same conditions as in Example 2 to which a chain transfer agent was added, except that the following compound (c) was used instead of the compound (a).
- the pressure-sensitive adhesive composition was emulsified with a 200-mesh filter cloth. Aggregates formed during the polymerization step were filtered, and the filtration residue was washed with water and dried overnight at room temperature. rice field. In this measurement, the smaller the amount of aggregates, the higher the polymerization stability in the emulsion polymerization step, and less than 0.1% by mass was evaluated as having high polymerization stability.
- a part of the pressure-sensitive adhesive composition was taken, and the particle size was measured by a dynamic light scattering type zeta potential / particle size / molecular weight measurement system (manufactured by Otsuka Electronics Co., Ltd., product name ELSZ-1000).
- a coating film was formed on the surface of a sheet-like substrate made of a 38 ⁇ m PET film cut to a size of 25 mm ⁇ 150 mm with a 4 mil applicator, and dried at 105 ° C. ⁇ 3 min to form an adhesive layer.
- An adhesive surface of 25 mm ⁇ 25 mm was attached to a SUS plate with a 2 kg crimping roller, cured for 24 hours, then a load of 1 kg was hung, and the time until the test piece fell was measured.
- the evaluation criteria are as follows. ⁇ : 48 hours or more ⁇ : 24 hours or more and less than 48 hours ⁇ : Less than 24 hours
- peeling force test Similar to the adhesive holding force test, an adhesive layer is formed on the surface of the PET film, the adhesive surface is attached to the SUS plate with a pressure-bonding roller, and after curing for 24 hours, at a speed of 300 mm / min and an angle of 180 °. The peeling force was measured.
- the evaluation criteria are as follows, and 5N or more and less than 10N was evaluated as an appropriate peeling force. ⁇ : 5N or more and less than 10N ⁇ : 10N or more or less than 5N
- the re-peelable sheet obtained by using the pressure-sensitive adhesive composition provided in this example has sufficient adhesive-holding power and can be peeled from the adherend with an appropriate peeling force, and is adhered after peeling. It was confirmed that there was little adhesive residue on the body surface and the peelability was excellent. On the other hand, when the pressure-sensitive adhesive composition provided by Comparative Example was used, it was confirmed that the pressure-sensitive adhesive holding power was not sufficient and the peelability was inferior because adhesive residue was generated.
- the pressure-sensitive adhesive composition of the present invention is excellent in adhesive properties to the surface of an adherend and is excellent in peelability, so that it can be suitably used as a pressure-sensitive adhesive for a re-peelable sheet such as an pressure-sensitive adhesive label or masking tape.
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Abstract
Description
上記のような問題が生じることなく、粘着シートを被着体から容易に剥離できるように、粘着剤層を形成する粘着剤として、架橋剤を添加し、凝集力を高くして粘着力を低下させた再剥離型粘着剤が多く提案されている。特に、再剥離型粘着剤においても、近年の環境衛生上の観点から、溶剤を用いない水性粘着剤への志向が強く、種々検討されている。
(A)成分として、R1で表される上記アルキル基の鎖長は、炭素数8~36の範囲で混在していることが好ましい。
m及びnはそれぞれ独立して、0~100の数であり、好ましくは1~80、より好ましくは2~50、更に好ましくは3~20の数である。
また、yが0であるものを使用することにより、適度に反応性を抑制し、効率よく共重合体が得られるため、yは0であることが好ましい。
また、4級アンモニウムカチオンとしては、アンモニア、アルキルアミン、アルカノールアミン由来の4級アンモニウムカチオンが挙げられる。
使用できる触媒はエポキシの開環反応に使用するものであれば特に限定されず、例えば、第3級アミン、第4級アンモニウム塩、三フッ化ホウ素又はそのエーテル錯塩、塩化アルミニウム、酸化バリウム、水酸化ナトリウム、水酸化カリウム等が挙げられる。
反応条件は、特に限定されないが、通常、温度は室温~150℃、圧力は常圧~0.5MPa程度の加圧下、反応時間は1~10時間程度である。必要に応じて、尿素などの触媒を使用してもよい。
また、Mが水素原子の場合には、水酸化ナトリウム、水酸化カリウムなどのアルカリ、アンモニア、アルキルアミン又はモノエタノールアミン、ジエタノールアミンなどのアルカノールアミンなどで中和を行ってもよい。
前記不飽和結合を2個以上有する不飽和カルボン酸エステルとしては、例えば、(ポリ)エチレングリコールジ(メタ)アクリレート、1,6-ヘキサンジオールジ(メタ)アクリレート、トリメチロールプロパントリ(メタ)アクリレート、メチレンビスアクリルアミド、ジビニルベンゼン等が挙げられる。
前記その他の不飽和化合物を使用する場合は、本発明で使用する共重合体100質量部に対して、0質量部~100質量部であることが好ましく、0質量部~70質量部であることがより好ましい。
1/Tg=W1/Tg1+W2/Tg2+・・・+Wn/Tgn
(式中、Tgは、本発明の(A)成分及び(B)成分から得られる共重合体のガラス転移温度(K)であり、W1、W2、・・・、Wnは、各モノマーの重量分率であり、Tg1、Tg2、・・・、Tgnは、各モノマーのホモポリマーのガラス転移温度である)
上記計算に用いるホモポリマーのガラス転移温度は、文献に記載されている値を用いることができ、例えば、三菱レイヨン株式会社のアクリルエステルカタログ(1997年度版)や北岡協三著、「新高分子文庫7 塗料用合成樹脂入門」、高分子刊行会、p168~p169などに記載されている。
アニオン系乳化剤としては、例えば、ラウリル硫酸ナトリウム、ラウリル硫酸アンモニウム、ドデシルベンゼンスルホン酸ナトリウム、ポリオキシエチレンアルキルエーテル硫酸ナトリウム、ポリオキシエチレンアルキルフェニルエーテル硫酸ナトリウム等が挙げられる。
ノニオン系乳化剤としては、例えば、ポリオキシエチレンアルキルエーテル、ポリオキシエチレンアルキルフェニルエーテル等が挙げられる。
なお、乳化剤は、単量体混合物に水を加えた溶液に直接添加してもよく、予め反応容器に添加しておいてもよく、又はこれらを併用してもよい。
具体的な重合開始剤としては、例えば、2,2’-アゾビス(2-メチルプロピオンアミジン)二塩酸塩、2,2’-アゾビス(2-アミジノプロパン)ジヒドロクロライド等のアゾ系化合物、過硫酸カリウム、過硫酸ナトリウム、過硫酸アンモニウム等の過硫酸塩、ベンゾイルパーオキサイド、t-ブチルハイドロパーオキサイド、過酸化水素等の過酸化物等が挙げられる。また、過硫酸塩と亜硫酸水素ナトリウムとの組み合わせや、過酸物とアスコルビン酸ナトリウムとの組み合わせ等からなるレドックス開始剤を用いてもよい。
これらの重合開始剤は、単独で又は2種以上を組み合わせて用いてもよい。
これらの中でも、重合安定性に優れているという観点から、過硫酸塩又はレドックス開始剤が好ましい。
添加に当たっては、重合開始剤を別途溶媒や単量体混合物に溶解して添加してもよく、溶解した重合開始剤を更に乳化状にして、添加してもよい。
前記連鎖移動剤としては、例えば、デカンチオール、ラウリルメルカプタン、グリシジルメルカプタン、メルカプト酢酸、2-メルカプトエタノール、チオグリコール酸、チオグルコール酸2-エチルヘキシル、2,3-ジメルカプト-1-プロパノール等が挙げられる。
前記pH緩衝剤としては、pH緩衝作用を有する化合物であれば特に制限されないが、例えば、炭酸水素ナトリウム、炭酸水素カリウム、リン酸一ナトリウム、リン酸一カリウム、リン酸二ナトリウム、リン酸三ナトリウム、酢酸ナトリウム、酢酸アンモニウム、ギ酸ナトリウム、ギ酸アンモニウム等が挙げられる。
水の使用量は、単量体混合物100重量部に対して、好ましくは30~400質量部、より好ましくは35~200質量部、更に好ましくは40~150質量部である。水の使用量が30質量部以上であれば、得られる共重合体のエマルションの粘度を適切な範囲とすることができる。また、重合安定性も良好となる。一方、400質量部以下であれば、得られる共重合体のエマルションの固形分濃度を適切な範囲とすることができ、再剥離シートを構成する基材上に塗布して塗布膜を形成する際の塗布膜の形成性が良好となる。
その乳化重合を行う際の手順としては、以下の(1)~(3)の方法が挙げられ、重合温度の制御が容易であるとの観点から、(2)又は(3)の方法が好ましく、(3)の方法がより好ましい。
(1)単量体混合物を反応容器に入れて、昇温し、水又は溶剤に溶かした重合開始剤を滴下又は分割添加して、重合する。
(2)反応容器内に単量体混合物の一部を入れて、昇温した後、水又は溶剤に溶かした重合開始剤を滴下又は分割添加して重合反応を進行させた後、残りの単量体混合物を滴下又は分割添加して重合を継続する。
(3)反応容器内に水又は溶剤に溶かした重合開始剤を入れておき昇温した後、単量体混合物及び水又は溶剤からなる乳濁液又は溶液を全量滴下又は分割添加して重合する。
(1)の方法では、温度範囲としては40~100℃が好ましく、1~8時間程度で重合反応を行うことが好ましい。
(2)の方法では、単量体混合物の1~50質量%を40~90℃で0.1~4時間で重合した後、残りの単量体混合物を1~5時間程度かけて全量滴下又は分割添加して、その後、同温度で1~3時間程度熟成することが好ましい。
(3)の方法では、水に溶かした重合開始剤を、好ましくは40~90℃まで昇温し、単量体混合物及び水からなる乳濁液を2~5時間程度かけて全量滴下又は分割添加することが好ましい。また、その後、同温度で1~5時間熟成することが好ましい。
共重合体のエマルションについては、上記アルカリ水溶液を添加して、pHを上記範囲に調整することが好ましい。
上記アルカリ水溶液は、重合中又は重合終了後に添加することができるが、重合安定性及び得られるエマルションの経時粘度安定性の観点から、重合中の熟成段階で、室温まで冷却後、一部又は全量を添加することが好ましい。
架橋剤としては、例えば、エポキシ系化合物、オキサゾリン系化合物、カルボジイミド系化合物、アジリジン系化合物、ポリイソシアネート化合物、メラミン系化合物、金属錯体系化合物、アミン系化合物、アジピン酸ジヒドラジド、セバシン酸ジヒドラジド等のヒドラジン誘導体等が挙げられる。
これらの架橋剤は、単独で又は2種以上を組み合わせて用いてもよい。
前記エポキシ系化合物としては、例えば、ハイドロキノン、レゾルシン、ピロカテコール、フロログルクシノールなどの単核多価フェノール化合物のポリグリシジルエーテル化合物;ジヒドロキシナフタレン、ビフェノール、メチレンビスフェノール(ビスフェノールF)、メチレンビス(オルトクレゾール)、エチリデンビスフェノール、イソプロピリデンビスフェノール(ビスフェノールA)、イソプロピリデンビス(オルトクレゾール)、テトラブロモビスフェノールA、1,3-ビス(4-ヒドロキシクミルベンゼン)、1,4-ビス(4-ヒドロキシクミルベンゼン)、1,1,3-トリス(4-ヒドロキシフェニル)ブタン、1,1,2,2-テトラ(4-ヒドロキシフェニル)エタン、チオビスフェノール、スルホビスフェノール、オキシビスフェノール、フェノールノボラック、オルソクレゾールノボラック、エチルフェノールノボラック、ブチルフェノールノボラック、オクチルフェノールノボラック、レゾルシンノボラック、テルペンフェノール等の多核多価フェノール化合物のポリグリシジルエーテル化合物;エチレングリコール、プロピレングリコール、ブチレングリコール、ヘキサンジオール、ポリエチレングリコール、ポリプロピレングリコール、チオグリコール、ジシクロペンタジエンジメタノール、2,2-ビス(4-ヒドロキシシクロヘキシル)プロパン(水素化ビスフェノールA)、グリセリン、トリメチロールプロパン、ペンタエリスリトール、ソルビトール、ビスフェノールA-アルキレンオキシド付加物などの多価アルコール化合物のポリグリシジルエーテル化合物;マレイン酸、フマル酸、イタコン酸、コハク酸、グルタル酸、スベリン酸、アジピン酸、アゼライン酸、セバシン酸、ダイマー酸、トリマー酸、フタル酸、イソフタル酸、テレフタル酸、トリメリット酸、トリメシン酸、ピロメリット酸、テトラヒドロフタル酸、エンドメチレンテトラヒドロフタル酸等の脂肪族、芳香族又は脂環族多塩基酸のグリシジルエステル化合物及びグリシジルメタクリレートの単独重合体又は共重合体;N,N-ジグリシジルアニリン、ビス(4-(N-メチル-N-グリシジルアミノ)フェニル)メタン、ジグリシジルオルトトルイジン、N,N-ビス(2,3-エポキシプロピル)-4-(2,3-エポキシプロポキシ)-2-メチルアニリン、N,N-ビス(2,3-エポキシプロピル)-4-(2,3-エポキシプロポキシ)アニリン、N,N,N’,N’-テトラ(2,3-エポキシプロピル)-4,4-ジアミノジフェニルメタン等のグリシジルアミノ基を有するエポキシ化合物;ビニルシクロヘキセンジエポキシド、シクロペンタンジエンジエポキサイド、3,4-エポキシシクロヘキシルメチル-3,4-エポキシシクロヘキサンカルボキシレート、3,4-エポキシ-6-メチルシクロヘキシルメチル-6-メチルシクロヘキサンカルボキシレート、ビス(3,4-エポキシ-6-メチルシクロヘキシルメチル)アジペート等の環状オレフィン化合物のエポキシ化物;エポキシ化ポリブタジエン、エポキシ化スチレン-ブタジエン共重合物等のエポキシ化共役ジエン重合体;トリグリシジルイソシアヌレート等の複素環化合物が挙げられる。また、これらのエポキシ樹脂は、末端イソシアネートのプレポリマーにより内部架橋されたもの、あるいは多価の活性水素化合物(多価フェノール、ポリアミン、カルボニル基含有化合物、ポリリン酸エステル等)で高分子量化したものでもよい。
これらの中でも、水性タイプの架橋剤が好ましく、グリセロールポリグリシジルエーテルがより好ましい。
このようなオキサゾリン系化合物としては、例えば、2位の炭素位置に不飽和炭素-炭素結合をもつ置換基を有する付加重合性2-オキサゾリン(例えば2-イソプロペニル-2-オキサゾリン)と他の不飽和モノマーとの共重合体等が挙げられる。
上記共重合体としては、例えば、「エポクロスWS-500」、「エポクロスWS-700」、「エポクロスK-2010E」、「エポクロスK-2020E」、「エポクロスK-2030E」(いずれも商品名、日本触媒社製)等が挙げられる。
このようなカルボジイミド化合物としては、例えば、「カルボジライトV-02」、「カルボジライトV-02-L2」、「カルボジライトV-04」、「カルボジライトV-06」、「カルボジライトE-01」、「カルボジライトE-02」、「カルボジライトE-04」(いずれも商品名、日清紡社製)等が挙げられる。
その他の添加剤としては、例えば、(重合)ロジン系樹脂、(重合)ロジンエステル系樹脂、テルペン系樹脂、テルペンフェノール系樹脂等の粘着付与樹脂、アジピン酸ジエステル類、フマル酸ジエステル類、セバシン酸ジエステル類等の可塑剤、コハク酸ジアルキルエステルスルホン酸塩、シリコーン系界面活性剤、フッ素系界面活性剤、アセチレンジオール系界面活性剤等の濡れ剤、軟化剤、充填剤、顔料、染料、老化防止剤、増粘剤、消泡剤、防腐剤等が挙げられる。
当該粘度が500mPa・s以下であれば、高速塗布に対応することができる。また、当該粘度が100mPa・s以下であると、塗布膜にはじきが発生する可能性がある。
また、再剥離シートには、再剥離テープ、再剥離ラベルなども含まれる。
なお、ここでは、シート状基材の片面に粘着剤層を有する再剥離シートについて説明するが、シート状基材の両面に粘着剤層を有してもよく、粘着剤層自体が再剥離シートとして用いられる場合も本発明の範囲に含まれることとする。
本発明の粘着剤組成物をシート状基材の表面に塗布する方法としては、公知の方法を用いることができ、例えば、グラビアコート法、バーコート法、スプレーコート法、ロールコート法、ダイコート法、ナイフコート法、エアナイフコート法、リップコート法、カーテンコート法等が挙げられる。
(B)成分のモノマーとしてアクリル酸2-エチルヘキシル80g、アクリル酸ブチル116g、アクリル酸4gを混合し混合モノマー液を調整した。
混合モノマー液200gと、(A)成分のモノマーとして、下記化合物(a)3.4g及びイオン交換水56g、重合開始剤として過硫酸アンモニウム0.4gを振とうにより混合し滴下用の混合モノマー乳濁液(単量体混合物)を調製した。
これとは別に、撹拌機、還流冷却器、温度計、窒素導入管及び滴下漏斗を備えた反応容器に、イオン交換水100.4gを入れ、80℃に昇温させた。80℃で安定したところに重合開始剤として過硫酸アンモニウム0.4gをイオン交換水3.6gに溶解させた溶液を添加した。次いで、重合開始剤の添加15分後より3時間かけて、混合モノマー乳濁液259.8gを滴下して重合させた。更に、続けて1時間熟成した後、冷却してアンモニア水でpHを7~8に調整して本発明の評価実験に供する共重合体エマルションを得た。
滴下漏斗側に、連鎖移動剤として表1に示した量(g)のデカンチオールを混合モノマー乳濁液に添加混合した後、滴下する以外は、実施例1と同条件で合成した。
前記化合物(a)の代わりに下記化合物(b)を用いた以外は連鎖移動剤を添加した実施例2と同条件で合成した。
前記化合物(a)の代わりに下記化合物(c)を用いた以外は連鎖移動剤を添加した実施例2と同条件で合成した。
化合物(a)の代わりに下記化合物(x)を用いた以外は実施例1と同条件で合成した。
化合物(a)の代わりに上記化合物(x)を用いた以外は連鎖移動剤を添加した実施例3と同条件で合成した。
化合物(a)の代わりに下記化合物(y)を用いた以外は実施例1と同条件で合成した。
化合物(a)の代わりに上記化合物(y)を用いた以外は連鎖移動剤を添加した実施例3と同条件で合成した。
粘着剤組成物を200メッシュの濾布で乳化重合工程中に生成した凝集物をろ過して、ろ過残渣を水洗後、常温で1晩乾燥させ、その質量を粘着剤組成物に対する質量%で示した。なお、本測定において凝集物量が少ない程、乳化重合工程における重合安定性が高いことを意味し、0.1質量%未満を重合安定性が高いと評価した。
粘着剤組成物の一部を取り、動的光散乱式ゼータ電位・粒径・分子量測定システム(大塚電子株式会社製、製品名ELSZ-1000)にて粒子径を測定した。
25mm×150mmの大きさにカットした厚さ38μmPETフィルムからなるシート状基材の表面に4milアプリケーターで塗布膜を形成し、105℃×3min乾燥させて、粘着剤層を形成した。25mm×25mmの接着面を2kgの圧着ローラーでSUS板に貼付し24時間養生後、1kgの荷重を吊るし、試験片が落下するまでの時間を計測した。評価基準は以下の通りである。
〇:48時間以上
△:24時間以上48時間未満
×:24時間未満
前記粘着保持力試験と同様に、PETフィルムの表面に粘着剤層を形成し、接着面を圧着ローラーでSUS板に貼付し、24時間養生後、300mm/minの速度で角度180°の時の剥離力を測定した。評価基準は以下の通りであり、5N以上10N未満を適度な剥離力と評価した。
〇:5N以上10N未満
×:10N以上又は5N未満
剥離力試験後のSUS板を用い、残存した樹脂分を色素で着色し目視で評価した。評価基準は以下の通りである。
5点:貼付後剥離して糊が残った割合が20%未満であるもの。
4点:貼付後剥離して糊が残った割合が20%以上40%未満であるもの。
3点:貼付後剥離して糊が残った割合が40%以上60%未満であるもの。
2点:貼付後剥離して糊が残った割合が61%以上80%未満であるもの。
1点:貼付後剥離して糊が残った割合が80%以上であるもの。
前記粘着保持力試験と同様に、PETフィルムの表面に粘着剤層を形成した。24時間アセトンに浸漬し、浸漬前後の重量変化からゲル分率を算出した。評価基準は以下の通りであり値が大きいものを良好と評価した。
〇:30質量%以上
△:21-29質量%
×:20質量%以下
一方で比較例により提供される粘着剤組成物を用いた場合は、粘着保持力も十分ではなく、糊残りを生じるため剥離性に劣ることが確認された。
Claims (11)
- (A)下記式(1)で表される不飽和化合物の少なくとも1種と、(B)不飽和カルボン酸及び(A)成分以外の不飽和カルボン酸エステル化合物からなる群から選ばれる少なくとも1種とを、重合して得られる共重合体を含有する粘着剤組成物。
- 前記一般式(1)において、R1が、炭素数8~36の分岐脂肪族炭化水素基又は分岐脂肪族アシル基である請求項1に記載の粘着剤組成物。
- 前記一般式(1)において、Xが、アニオン性親水基である請求項1又は2に記載の粘着剤組成物。
- 前記一般式(1)において、Xが、-SO3M、-R4-SO3M、-R5-COOM、-PO3M2、-PO3MH又は-CO-R6-COOM(式中、Mは水素原子、アルカリ金属原子、アルカリ土類金属原子〔但し、アルカリ土類金属原子は通常2価であるため1/2モルがMに相当〕、4級アンモニウムカチオンを表し、R4及びR5は炭素数1~6のアルキレン基を表し、R6は炭素数1~12の2価の炭化水素基を表す。)で表されるアニオン性親水基であることを特徴とする、請求項3に記載の粘着剤組成物。
- 前記一般式(1)において、Xが、カチオン性親水基である請求項1又は2に記載の粘着剤組成物。
- 前記一般式(1)において、Xが、-R7-NR8R9R10・Y、又は-Z-NR8R9R10・Y(式中、R7は炭素数1~6のアルキレン基を表し、R8~R10はそれぞれ独立して炭素数1~4のアルキル基、炭素数2~4のアルカノール基又はベンジル基を表し、Yはハロゲン原子又はメチル硫酸基を表し、Zは-CH2CH(OH)CH2-又は-CH(CH2OH)CH2-で表される基を表す。)で表されるカチオン性親水基である請求項5に記載の粘着剤組成物。
- 前記一般式(1)において、zが1~5の数である請求項1~6の何れか一項に記載の粘着剤組成物。
- (B)成分が、アクリル酸、メタクリル酸、及びこれらのエステル化合物からなる群から選ばれる少なくとも1種であることを特徴とする、請求項1~7の何れか一項に記載の粘着剤組成物。
- 請求項1~8の何れか一項に記載された粘着剤組成物からなる粘着剤層を有する再剥離シート。
- (A)下記式(1)で表される不飽和化合物の少なくとも1種と、(B)不飽和カルボン酸及び(A)成分以外の不飽和カルボン酸エステル化合物からなる群から選ばれる少なくとも1種とを、重合して共重合体を得ることを含む、粘着剤組成物の製造方法。
- 粘着剤組成物を製造するための、(A)下記式(1)で表される不飽和化合物の少なくとも1種と、(B)不飽和カルボン酸及び(A)成分以外の不飽和カルボン酸エステル化合物からなる群から選ばれる少なくとも1種とを、重合して得られる共重合体の使用。
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US17/914,596 US20230220250A1 (en) | 2020-03-31 | 2021-03-23 | Pressure-sensitive adhesive composition and method for producing same, and removable sheet provided with pressure-sensitive adhesive layer |
EP21779723.2A EP4130071A4 (en) | 2020-03-31 | 2021-03-23 | PRESSURE-SENSITIVE ADHESIVE COMPOSITION AND METHOD FOR MAKING SAME AND REMOVABLE FILM WITH THE PRESSURE-SENSITIVE ADHESIVE LAYER |
CN202180025887.8A CN115362229A (zh) | 2020-03-31 | 2021-03-23 | 压敏粘合剂组合物及其制造方法以及具有压敏粘合剂层的再剥离片 |
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CN115362229A (zh) | 2022-11-18 |
EP4130071A4 (en) | 2024-04-24 |
US20230220250A1 (en) | 2023-07-13 |
EP4130071A1 (en) | 2023-02-08 |
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