# US 7,612,149 B2 · Vulcanizable chlorinated elastomer compositions with improved processing safety and cure rate > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,612,149 B2 - Document ID: US7612149B2 - Status: Granted - Kind: B2 - Application number: 11/372,511 - Filed: 2006-03-10 - Published: 2006-09-14 - Granted: 2009-11-03 - Earliest claimed: 2005-03-14 - Assignees: Dow Global Technologies LLC - Inventors: Raymond L. Laakso, Jr.; Gary R. Marchand - Web page: https://patentgrep.com/patent/US7612149B2 ## CPC - C08K 5/34: Heterocyclic compounds having nitrogen in the ring - C08K 5/46: with oxygen or nitrogen in the ring - C08L 11/00: Compositions of homopolymers or copolymers of chloroprene - C08L 23/286: Chlorinated polyethylene - C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09) - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) ## Abstract The instant invention is an improved cure system composition and a method for curing chlorinated elastomer compositions. The cure system composition includes a polymercapto crosslinking agent, an inorganic base, and a quaternary ammonium salt. The quaternary ammonium salt has a formula selected from the group consisting of wherein R1 is an alkyl or aryl group containing between 4 and 12 carbon atoms; wherein R2 and R3 are independently alkyl or aryl groups containing between 1 and 8 carbon atoms; wherein the total number of carbon atoms on R2 and R3 are between 3 and 9; wherein R4 and R5 are methyl groups, and R6 is an alkyl group containing between 2 and 8 carbon atoms; and wherein X is an anion. The method for curing a chlorinated elastomer composition according to instant invention includes the following steps: (1) providing a chlorinated elastomer composition; (2) providing a cure system composition as described above; (3) contacting said chlorinated elastomer composition with said cure system composition; and (4) thereby curing said chlorinated elastomer composition. ## Claims ### Claim 1 A cure system composition consisting essentially of: a polymercapto crosslinking agent, wherein said polymercapto crosslinking agent is 2-mercapto-1,3,4-thiadiazole-5-thiobenzoate; an inorganic base; and a quaternary ammonium salt selected from the group consisting of 1-octylpyridinium chloride, 1-octylpyridinium bromide, 1-butyl-3-methylimidazolinium chloride, 1-hexyl-3-methylimidazolinium chloride, and 1-hexyl-2,3-dimethylimidazolinium chloride. ### Claim 2 A curable chlorinated elastomer composition consisting essentially of: a chlorinated elastomer; a polymercapto crosslinking agent, wherein said polymercapto crosslinking agent is 2-mercapto-1,3,4-thiadiazole-5-thiobenzoate; an inorganic base; and a quaternary ammonium salt selected from the group consisting of 1-octylpyridinium chloride, 1-octylpyridinium bromide, 1-butyl-3-methylimidazolinium chloride, 1-hexyl-3-methylimidazolinium chloride, and 1-hexyl-2,3-dimethylimidazolinium chloride. ### Claim 3 (depends on 2) The curable chlorinated elastomer composition according to claim 2, wherein said chlorinated elastomer is selected from the group consisting of polychloroprene, polyepichlorohydrin, epichlorohydrin/ethylene oxide copolymers, chlorosulfonated polyethylene, chlorinated polyethylene, and chlorinated butyl rubbers. ### Claim 4 (depends on 3) The curable chlorinated elastomer composition according to claim 3, wherein said chlorinated elastomer is chlorinated polyethylene. ### Claim 5 An article comprising at least one component formed from a cured composition, wherein said cured composition being formed from a curable chlorinated elastomer composition consisting essentially of: a chlorinated elastomer; a polymercapto crosslinking agent, wherein said polymercapto crosslinking agent is 2-mercapto-1,3,4-thiadiazole-5-thiobenzoate; an inorganic base; and a quaternary ammonium salt selected from the group consisting of 1-octylpyridinium chloride, 1-octylpyridinium bromide, 1-butyl-3-methylimidazolinium chloride, 1-hexyl-3-methylimidazolinium chloride, and 1-hexyl-2,3-dimethylimidazolinium chloride. ### Claim 6 (depends on 5) The article according to claim 5, wherein said chlorinated elastomer is selected from the group consisting of polychloroprene, polyepichlorohydrin, epichlorohydrin/ethylene oxide copolymers, chlorosulfonated polyethylene, chlorinated polyethylene, and chlorinated butyl rubbers. ### Claim 7 (depends on 6) The article according to claim 6, wherein said chlorinated elastomer is chlorinated polyethylene. ### Claim 8 A method of curing a chlorinated elastomer composition comprising the steps of: providing a chlorinated elastomer composition; providing a cure system composition consisting essentially of: a polymercapto crosslinking agent, wherein said polymercapto crosslinking agent is 2-mercapto-1,3,4-thiadiazole-5-thiobenzoate; an inorganic base; and a quaternary ammonium salt selected from the group consisting of 1-octylpyridinium chloride, 1-octylpyridinium bromide, 1-butyl-3-methylimidazolinium chloride, 1-hexyl-3-methylimidazolinium chloride, and 1-hexyl-2,3-dimethylimidazolinium chloride; contacting said chlorinated elastomer composition with said cure system composition, and thereby curing said chlorinated elastomer composition. ### Claim 9 (depends on 8) The method of curing a chlorinated elastomer composition according to claim 8, wherein said chlorinated elastomer composition and said cure system composition are admixed. ### Claim 10 (depends on 8) The method of curing a chlorinated elastomer composition according to claim 8, wherein said contacting step is conducted in a temperature range of 130° C. to 200° C. ### Claim 11 (depends on 8) The method of curing a chlorinated elastomer composition according to claim 8, wherein said chlorinated elastomer is selected from the group consisting of polychloroprene, polyepichlorohydrin, epichlorohydrin/ethylene oxide copolymers, chlorosulfonated polyethylene, chlorinated polyethylene, and chlorinated butyl rubbers. ### Claim 12 (depends on 11) The method of curing a chlorinated elastomer composition according to claim 11, wherein said chlorinated elastomer is chlorinated polyethylene.