ETHYLENE-PROPYLENE-DIENE RUBBER, ELASTOMER COMPOSITION AND VULCANIZED RUBBER THEREOF

摘要

Disclosed is an ethylene-propylene-diene (EPDM) rubber containing sulfur dispersed therein. The rubber has been heat treated at a temperature of 90 to 160.degree.C while kneading to such an extent that the EPDM is only partially crosslinked. The EPDM preferably has a Mooney viscosity ML1+4 (100.degree.C) of 60 to 120 and is a mixture of: (A) 90 to 40% by weight of a high-molecular weight ethylene-propylene-diene copolymer rubber having an ethylene content of 60 to 82 mol%, an intrinsic viscosity ¢?! of 3.0 to 5.0 dl/g as measured at 135.degree.C in decalin and an iodine value of 8 to 35, and (B) 10 to 60% by weight of a low-molecular-weight ethylene-propylene-diene copolymer rubber having an ethylene content of 60 to 82 mol%, an intrinsic viscosity ¢?! of 0.15 to 0.8 dl/g as measured at 135.degree.C in decalin and an iodine value of 8 to 35. The rubber is suitable for use in the fields of tires, automobile parts, general-purpose industrial components and civil engineering and building components.