# US 2019/0375876 A1 · Curable composition > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0375876 A1 - Document ID: US20190375876A1 - Status: Published application - Kind: A1 - Application number: 16/548,013 - Filed: 2019-08-22 - Published: 2019-12-12 - Earliest claimed: 2017-02-22 - Assignees: Kaneka Corporation - Applicants: Kaneka Corporation - Inventors: Yoshihiro Ikari - Web page: https://patentgrep.com/patent/US20190375876A1 ## CPC - C08F 299/00: Macromolecular compounds obtained by interreacting polymers involving only carbon-to-carbon unsaturated bond reactions, in the absence of non-macromolecular monomers - C08F 8/00: Chemical modification by after-treatment (graft polymers, block polymers, crosslinking with unsaturated monomers or with polymers C08F251/00 - C08F299/00; of conjugated diene rubbers C08C) - C08F 2810/30: leading to the formation or introduction of aliphatic or alicyclic unsaturated groups - C08F 2810/40: taking place solely at one end or both ends of the polymer backbone, i.e. not in the side or lateral chains - C08L 2205/025: containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure - C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) ## Abstract A curable composition may include 100 parts by weight of a polyisobutylene-based polymer (A) having 1.2 or more (meth)acryloyl groups per molecule, 15 to 900 parts by weight of a polyisobutylene-based polymer (B) having 0.5 to 1.0 (meth)acryloyl group per molecule, and 0.001 to 50 parts by weight, per 100 parts by weight of the total weight of the polymer (A) and the polymer (B), of a polymerization initiator (C). Each of the polymer (A) and the polymer (B) may have a number average molecular weight of 500 to 500,000 as measured by size exclusion chromatography based on polystyrene standards, and a molecular weight distribution (weight-average molecular weight Mw)/(number-average molecular weight Mn) of 1.0 to 2.0. ## Claims ### Claim 1 A curable composition, comprising: 100 parts by weight of a polyisobutylene-based polymer (A) having 1.2 or more (meth)acryloyl groups per molecule; 15 to 900 parts by weight of a polyisobutylene-based polymer (B) having 0.5 to 1.0 (meth)acryloyl group per molecule; and 0.001 to 50 parts by weight, per 100 parts by weight of the total weight of the polymer (A) and the polymer (B), of a polymerization initiator (C), wherein each of the polymer (A) and the polymer (B) have a number average molecular weight of 500 to 500,000 as measured by size exclusion chromatography based on polystyrene standards, and a molecular weight distribution (weight-average molecular weight Mw)/(number-average molecular weight Mn) of 1.0 to 2.0, wherein the polymer (A) includes one or more selected from the group consisting of polymers represented by the following general formulas (1) and (3) to (6): where, independently, R1 represents a divalent or higher alkyl-substituted benzene having a free valence at the benzylic position or a divalent or higher-valent alkylene group having 4 to 20 carbon atoms and a free valence on a tertiary carbon, A represents a polyisobutylene-based polymer; R2 represents a divalent saturated hydrocarbon group having 2 to 6 carbon atoms and containing no heteroatoms, R3 and R4 each represent hydrogen, a monovalent hydrocarbon group having 1 to 20 carbon atoms, or an alkoxy group, R5 represents hydrogen or a methyl group, and n represents an integer of 2 or greater, and the polymer (B) includes one or more selected from the group consisting of polymers represented by the following general formulas (2) and (7) to (10): where, independently, R6 represents a monovalent alkyl-substituted benzene having a free valence at the α-position of alkyl or an alkyl group having 4 to 20 carbon atoms and a free valence on tertiary carbon, A represents a polyisobutylene-based polymer, R2 represents a divalent saturated hydrocarbon group having 2 to 6 carbon atoms and having no hetero atoms, R3 and R4 each represent hydrogen, a monovalent hydrocarbon group having 1 to 20 carbon atoms, or an alkoxy group, and R5 represents hydrogen or a methyl group. ### Claim 2 (depends on 1) The curable composition according to claim 1, wherein the (meth)acryloyl groups are positioned at the ends of the polymer chain of polymer (A). ### Claim 3 (depends on 1) The curable composition according to claim 1, wherein the (meth)acryloyl group is positioned at one end of the polymer chain of polymer (B). ### Claim 4 (depends on 1) The curable composition according to claim 1, wherein the polymer (A) includes a polymer of the general formula (1), and the polymer (B) includes a polymer of the general formula (2). ### Claim 5 (depends on 1) The curable composition according to claim 1, wherein R2 of the polymer (A) is a divalent saturated hydrocarbon group selected from the group consisting of —CH2CH2—, —CH2CH2CH2—, and —CH2CH2CH2CH2—. ### Claim 6 (depends on 1) The curable composition according to claim 1, wherein R2 of the polymer (B) is a divalent saturated hydrocarbon group selected from the group consisting of —CH2CH2—, —CH2CH2CH2—, and —CH2CH2CH2CH2—. ### Claim 7 (depends on 1) The curable composition according to claim 1, wherein R3 and R4 in both the polymer (A) and the polymer (B) each represent hydrogen. ### Claim 8 (depends on 1) The curable composition according to claim 1, wherein n in the polymer (A) is 2. ### Claim 9 (depends on 1) The curable composition according to claim 1, wherein the polymerization initiator (C) is a radical polymerization initiator or an anionic polymerization initiator. ### Claim 10 (depends on 9) The curable composition according to claim 9, wherein the polymerization initiator (C) is a photo radical polymerization initiator capable of generating a radical species by light. ### Claim 11 (depends on 1) A cured product obtained by radical curing of the curable composition according to claim 1 with active energy rays.