Rubber compositions

摘要

A rubber composition excellent in processabilities such as rolling processability and extrusion processability before vulcanization and excellent in weather resistance and heat resistance and high in hardness after vulcanization is disclosed. This rubber composition comprises 100 parts by weight of an ethylene. alpha -olefin copolymer rubber and/or an isobutylene-isoprene rubbers, 3 to 60 parts by weight of a polybutadiene rubber which is liquid at room temperature and/or a polyisoprene rubber which is liquid at room temperature and 3 to 35 parts by weight of sulfur.