Patent ID: 6602942
Filing Date: 2003-08-05
Classification: C08K

Abstract:
An oil-extended rubber comprising 100 parts by weight of a rubber ingredient comprising a conjugated diene rubber wherein the ratio (Mw/Mn) of weight average molecular weight (Mw) to number average molecular weight (Mn), as measured by gel permeation chromatography and expressed in terms of those of polystyrene, is in the range of 1.2 to 2.2, and the conjugated diene monomer units have a vinyl bond unit content of at least 20%, and 5 to 100 parts by weight of a process oil having a total acid value of not larger than 1.0 mgKOH/g, a pour point of not higher than 50Â° C. and an aromatic carbon content of at least 20% as measured by the Kurtz analysis method.