Patent ID: 6096791
Filing Date: 2000-08-01
Classification: C08J

Abstract:
A rubber composition useful for preparing a heat-curing expanding molding, said rubber composition being comprised of:(a) 5 to 50%, based on the weight of the rubber composition as a whole, of one or more solid rubbers comprised of cis-1,4-polybutadiene having a molecular weight above 80,000 and a cis content of more than 70%;(b) a vulcanization system free from elemental sulfur, said vulcanization system being comprised of 0.02 to 5%, based on the weight of the rubber composition as a whole, of one or more vulcanizing agents and, optionally, one or more vulcanization accelerators or catalysts;(c) 10 to 70%, based on the weight of the rubber composition as a whole, of one or more fillers;(d) one or both of(i) 5 to 20%, based on the weight of the rubber composition as a whole, of one or more tackifiers;(ii) 0.1 to 10%, based on the weight of the rubber composition as a whole, of one or more coupling agents;(e) 2 to 20%, based on the weight of the rubber composition as a whole, of one or more extender oils or plasticizers; and(f) 0.1 to 5%, based on the weight of the rubber composition as a whole, of one or more antiagers;(g) one or more blowing agents.