Production of sulfur-modified solid chloroprene rubbers

Details Production of sulfur-modified solid chloroprene rubbers Production of sulfur-modified solid chloroprene rubbers

C - Chemistry, Metallurgy

08

F

402/351, 400/480

C08F 236/18 (2006.01) C08F 36/18 (2006.01) C08L 11/00 (2006.01) C08L 15/02 (2006.01)

Patent

CA 1206691

A B S T R A C T Production of sulfur-modified chloroprene rubbers Vulcanisable, elastomeric chloroprene/sulfur copolymers having viscosites of from 60 to 35 ME, strengths of greater than 20 MPa and sulfur contents of from about 0.3 to 0.45% by weight are obtained by polymerising chloroprene in the presence of from 0.05 to 0.40% by weight of sulfur to form a latex I, polymerising chloroprene in the presence of from 0.5 to 1.5 % by weight of sulfur to form a latex II, mixing latices I and II, optionally together with other sulfur-modified polychloroprene latices, in a ratio of from 4:1 to 1:4 (based in each case on solids) and peptising the mixture, followed by working up to form the solid rubber, the percentages quoted being based on the quantity of monomer.

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