# US 2014/0194546 A1 · Easily dismantlable adhesive composition and easily dismantlable adhesive tape > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0194546 A1 - Document ID: US20140194546A1 - Status: Published application - Kind: A1 - Application number: 14/122,299 - Filed: 2012-06-01 - Published: 2014-07-10 - Earliest claimed: 2011-06-02 - Assignees: Osaka City University; DIC Corporation - Applicants: DIC Corporation - Inventors: Akikazu Matsumoto; Eriko Sato; Akinori Morino; Koujirou Tanaka - Web page: https://patentgrep.com/patent/US20140194546A1 ## CPC - C09J 153/00: 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 - C08F 293/00: 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 (on to polymers modified by introduction of unsaturated end groups C08F290/02) - C08F 293/005: {using free radical "living" or "controlled" polymerisation, e.g. using a complexing agent} - C09J 7/385: {Acrylic polymers} - C09J 7/387: {Block-copolymers} - C09J 133/08: Homopolymers or copolymers of acrylic acid esters - C09J 153/005: {Modified block copolymers} - C09J 2433/00: Presence of (meth)acrylic polymer - C09J: ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES (preparation of glue or gelatine C09H) - C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS ## Abstract An easily dismantlable adhesive composition containing: an acrylic block polymer having a poly(meth)acrylate chain (A) formed of a carboxyl precursor group-containing (meth)acrylate monomer (a) and a poly(meth)acrylate chain (B) that contains, as monomer components, a (meth)acrylate (b) having an alkyl group having 1 to 14 carbon atoms and a polar group-containing monomer (c); and either an acid catalyst or an acid generator, makes it possible to achieve favorable adhesiveness and dismantlability and suppress stick-slip at the time of dismantlement. ## Claims ### Claim 1 An easily dismantlable adhesive composition comprising: an acrylic polymer; and either an acid catalyst or an acid generator, wherein the acrylic polymer is an acrylic block polymer having: a poly(meth)acrylate chain (A) formed of a carboxyl precursor group-containing (meth)acrylate monomer (a); and a poly(meth)acrylate chain (B) comprising, as monomer components, a (meth)acrylate (b) having an alkyl group having 1 to 14 carbon atoms, the (meth)acrylate (b) not being the carboxyl precursor group-containing (meth)acrylate monomer (a), and a polar group-containing monomer (c). ### Claim 2 (depends on 1) The easily dismantlable adhesive composition according to claim 1, wherein the carboxyl precursor group-containing (meth)acrylate monomer (a) is at least one selected from the group consisting of tert-butyl (meth)acrylate, 2-methyl-2-adamantyl (meth)acrylate, 2-ethyl-2-adamantyl (meth)acrylate, bornyl (meth)acrylate, isobornyl (meth)acrylate, cyclohexyl (meth)acrylate, and benzyl (meth)acrylate. ### Claim 3 (depends on 1) The easily dismantlable adhesive composition according to claim 1, wherein the (meth)acrylate (b) having an alkyl group having 1 to 14 carbon atoms is at least one selected from the group consisting of 2-ethylhexyl (meth)acrylate and n-butyl (meth)acrylate. ### Claim 4 (depends on 1) The easily dismantlable adhesive composition according to claim 1, wherein a ratio of the poly(meth)acrylate chain (A) to the poly(meth)acrylate chain (B) in the acrylic polymer is 75/25 to 1/99 in terms of a molar ratio of (A)/(B). ### Claim 5 (depends on 1) The easily dismantlable adhesive composition according to claim 1, wherein the content of the polar group-containing monomer (c) is 1 to 30% by mass based on the total monomer components forming the acrylic block polymer. ### Claim 6 (depends on 1) An easily dismantlable adhesive tape comprising an adhesive layer formed of the easily dismantlable adhesive composition according to claim 1. ### Claim 7 (depends on 2) The easily dismantlable adhesive composition according to claim 2, wherein the (meth)acrylate (b) having an alkyl group having 1 to 14 carbon atoms is at least one selected from the group consisting of 2-ethylhexyl (meth)acrylate and n-butyl (meth)acrylate. ### Claim 8 (depends on 2) The easily dismantlable adhesive composition according to claim 2, wherein a ratio of the poly(meth)acrylate chain (A) to the poly(meth)acrylate chain (B) in the acrylic polymer is 75/25 to 1/99 in terms of a molar ratio of (A)/(B). ### Claim 9 (depends on 3) The easily dismantlable adhesive composition according to claim 3, wherein a ratio of the poly(meth)acrylate chain (A) to the poly(meth)acrylate chain (B) in the acrylic polymer is 75/25 to 1/99 in terms of a molar ratio of (A)/(B). ### Claim 10 (depends on 2) The easily dismantlable adhesive composition according to claim 2, wherein the content of the polar group-containing monomer (c) is 1 to 30% by mass based on the total monomer components forming the acrylic block polymer. ### Claim 11 (depends on 3) The easily dismantlable adhesive composition according to claim 3, wherein the content of the polar group-containing monomer (c) is 1 to 30% by mass based on the total monomer components forming the acrylic block polymer. ### Claim 12 (depends on 4) The easily dismantlable adhesive composition according to claim 4, wherein the content of the polar group-containing monomer (c) is 1 to 30% by mass based on the total monomer components forming the acrylic block polymer. ### Claim 13 (depends on 2) An easily dismantlable adhesive tape comprising an adhesive layer formed of the easily dismantlable adhesive composition according to claim 2. ### Claim 14 (depends on 3) An easily dismantlable adhesive tape comprising an adhesive layer formed of the easily dismantlable adhesive composition according to claim 3. ### Claim 15 (depends on 4) An easily dismantlable adhesive tape comprising an adhesive layer formed of the easily dismantlable adhesive composition according to claim 4. ### Claim 16 (depends on 5) An easily dismantlable adhesive tape comprising an adhesive layer formed of the easily dismantlable adhesive composition according to claim 5.