Heat resistant sulfur-modified polychloroprene copolymers

Details Heat resistant sulfur-modified polychloroprene copolymers Heat resistant sulfur-modified polychloroprene copolymers

C - Chemistry, Metallurgy

08

F

402/325

C08F 236/18 (2006.01) C08L 11/00 (2006.01)

Patent

CA 1239249

TITLE HEAT RESISTANT SULFUR-MODIFIED POLYCHLOROPRENE COPOLYMERS ABSTRACT OF THE DISCLOSURE A heat resistant sulfur-modified polychloroprene copolymer of 2-chloro-1,3-butadiene and 2,3-dichloro-1,3-butadiene characterized in that said polychloroprene has a Mooney viscosity ML 1+4' (100°C) of from about 25-75, contains from about 3-25% by weight of units derived from 2,3-di- chloro-1,3-butadiene, and of the units derived from 2-chloro-1,3-butadiene, 92-96% by weight of said units have a 1,4-trans configuration, said polychloroprene copolymer being curable with 4 parts MgO and 5 parts ZnO per 100 parts of copolymer at about 160°C for 30 minutes to yield a vulcanizate having a tensile strength of at least 10 MPa.

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