# US 2014/0194576 A1 · Rubber composition, crosslinked rubber composition, pneumatic tire, and method for producing isobutylene polymer > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0194576 A1 - Document ID: US20140194576A1 - Status: Published application - Kind: A1 - Application number: 14/232,075 - Filed: 2012-06-29 - Published: 2014-07-10 - Earliest claimed: 2011-07-15 - Assignees: Jx Nippon Oil & Energy Corporation - Inventors: Zhengzhe Jin; Tsutomu Takashima; Tsuyoshi Yamaguchi; Tatsuya Chiba - Web page: https://patentgrep.com/patent/US20140194576A1 ## CPC - C08F 216/165: {Carbocyclic compounds} - B60C 1/0016: {Compositions of the tread} - C08F 110/10: Isobutene - C08L 9/06: Copolymers with styrene - C08L 21/00: Compositions of unspecified rubbers - C08L 23/22: Copolymers of isobutene; Butyl rubber; Homopolymers or copolymers of other iso-olefins - C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS - B60C: VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) ## Abstract A rubber composition containing a rubber component having an olefinic double bond, and an isobutylene polymer having a structural unit represented by the following formula (1) and a structural unit represented by the following formula (2), wherein the content of a low molecular weight substance whose molecular weight is 1000 or less in the isobutylene polymer is 5% by mass or less based on the total amount of the isobutylene polymer. [wherein X represents a divalent group, Y represents a substituted or unsubstituted alicyclic group having an unsaturated bond, and n represents 0 or 1.] ## Claims ### Claim 1 A rubber composition containing a rubber component having an olefinic double bond, and an isobutylene polymer having a structural unit represented by the following formula (1) and a structural unit represented by the following formula (2), wherein a content of a low molecular weight substance whose molecular weight is 1000 or less in the isobutylene polymer is 5% by mass or less based on the total amount of the isobutylene polymer: wherein, X represents a divalent group, Y represents a substituted or unsubstituted alicyclic group having an unsaturated bond, and n represents 0 or 1. ### Claim 2 (depends on 1) The rubber composition according to claim 1, wherein the isobutylene polymer has a structural unit represented by the following formula (3) and/or a structural unit represented by the following formula (4) as the structural unit represented by the formula (2): wherein, n represents 0 or 1. ### Claim 3 (depends on 1) The rubber composition according to claim 1, wherein the isobutylene polymer is a polymer obtained by copolymerizing isobutylene and a vinyl ether compound represented by the following formula (7): CH2═CH—O—(X)n—Y (7) wherein, X represents a divalent group, Y represents a substituted or unsubstituted alicyclic group having an unsaturated bond, and n represents 0 or 1, in a reaction liquid to which a Lewis acid catalyst, a protic complexing agent and an aprotic complexing agent are added, and when a total molar number of the Lewis acid catalyst, a total molar number of the protic complexing agent and a total molar number of the aprotic complexing agent, added to the reaction liquid, are defined as A, B1 and B2, respectively, and a total molar number of the vinyl ether compound subjected to the copolymerization is defined as D, A/(B1+B2+D) is 1 to 10, A/B1 is 5 to 400 and B2/B1 is 0 to 50. ### Claim 4 (depends on 1) The rubber composition according to claim 1, wherein the rubber component contains at least one selected from the group consisting of a natural rubber, a butadiene rubber, a nitrile rubber, a silicone rubber, an isoprene rubber, a styrene-butadiene rubber, an isoprene-butadiene rubber, a styrene-isoprene-butadiene rubber, an ethylene-propylene-diene rubber, a halogenated butyl rubber, a halogenated isoprene rubber, a halogenated isobutylene copolymer, a chloroprene rubber, a butyl rubber and a halogenated isobutylene-p-methylstyrene rubber. ### Claim 5 (depends on 1) The rubber composition according to claim 1, wherein a content of the isobutylene polymer is 0.5 to 70 parts by mass per 100 parts by mass of the rubber component. ### Claim 6 (depends on 1) The rubber composition according to claim 1, wherein the rubber component is substantially a styrene-butadiene rubber. ### Claim 7 (depends on 1) The rubber composition according to claim 1, further containing a crosslinking agent. ### Claim 8 (depends on 1) A crosslinked rubber composition obtained from the rubber composition according to claim 1, having a structure in which the rubber component and the isobutylene polymer are crosslinked. ### Claim 9 (depends on 8) A pneumatic tire containing the crosslinked rubber composition according to claim 8 in a tread part. ### Claim 10 A method for producing an isobutylene polymer having a structural unit represented by the following formula (1) and a structural unit represented by the following formula (2), comprising a step of copolymerizing isobutylene and a vinyl ether compound represented by the following formula (7): CH2═CH—O—(X)n—Y (7) wherein X represents a divalent group, Y represents a substituted or unsubstituted alicyclic group having an unsaturated bond, and n represents 0 or 1, in a reaction liquid to which a Lewis acid catalyst, a protic complexing agent and an aprotic complexing agent are added, wherein in the step, when a total molar number of the Lewis acid catalyst, a total molar number of the protic complexing agent and a total molar number of the aprotic complexing agent, added to the reaction liquid, are defined as A, B1 and B2, respectively, and a total molar number of the vinyl ether compound subjected to the copolymerization is defined as D, A/(B1+B2+D) is 1 to 10, A/B1 is 5 to 400 and B2/B1 is 0 to 50: wherein, X represents a divalent group, Y represents a substituted or unsubstituted alicyclic group having an unsaturated bond, and n represents 0 or 1. ### Claim 11 (depends on 10) The method for producing an isobutylene polymer according to claim 10, wherein the Lewis acid catalyst is selected from the group consisting of a boron halide compound, a titanium halide compound, a tin halide compound, an aluminum halide compound, an antimony halide compound, a tungsten halide compound, a molybdenum halide compound, a tantalum halide compound and a metal alkoxide.