Silica-compounded diene rubber composition

摘要

A rubber composition containing 100 parts by weight of a diene rubber, 5 to 100 parts by weight of silica, 10 to 150 parts by weight of carbon black, and 1 to 40% by weight, based upon the weight of the silica, of a polysiloxane having an average degree of polymerization of 3 to 10,000 containing the following alkoxysilyl group (I) or acyloxysilyl group (II): IDENTICAL Si-OR<1> IDENTICAL Si-OCOR<2> wherein, R<1> is a substituted or unsubstituted monovalent hydrocarbon group having 1 to 18 carbon atoms or an ether bond-containing organic group having 1 to 18 carbon atoms and R<2> is hydrogen or a hydrocarbon group having 1 to 21 carbon atoms, provided that at least six alkoxy groups or at least two acyloxy groups directly bonded to the Si atoms are present in each molecule.