RUBBER COMPOSITION, VULCANIZABLE RUBBER COMPOSITION AND DAMPING RUBBER VULCANIZATE

摘要

A rubber composition comprising 100 parts by weight of a conjugated diene rubber and 5 to 100 parts by weight of a cyclized conjugated diene polymer having a degree of cyclization of 25 to 90 % and a weight-average molecular weight/number-average molecular weight Mw/Mn ratio of 2 or below as determined by gel permeation chromatography in terms of polystyrene a vulcanizable rubber composition comprising the rubber composition and a vulcanizing agent and a damping rubber vulcanizate obtained by vulcanizing the vulcanizable rubber composition. The invention provides a damping rubber vulcanizate which has satisfactory rubber strength and exhibits excellent damping properties over a wide temperature range from low temperature to high temperature and a rubber composition and a vulcanizable rubber composition which are favorably usable in the production of the vulcanizate.