Patent ID: 8193265

Claim:
A rubber composition which comprises, per 100 parts by mass of a polymer, 10 to 200 parts by mass of silica and 1 to 30 parts by mass of a silane compound having sulfur atom represented by average structural formula (I): (R 1 O) 3-p (R 2 ) p Si—R 3 —S m —R 4 —S m —R 3 —Si(R 2 ) p (OR 1 ) 3-p (I) wherein R 1 and R 2 each represent a hydrocarbon group having 1 to 4 carbon atoms, R 3 represents a divalent hydrocarbon group having 1 to 15 carbon atoms, p represents an integer of 0 to 2, m represents a number of 1 or greater and smaller than 2, which may be an average of numbers, and R 4 represents a divalent functional group represented by one of following general formulae (III) to (IV): R 6 —S x —R 7 (III) R 8 —S y —R 9 —S z —R 10 (IV) wherein R 6 to R 7 represents a linear divalent hydrocarbon group having 1 to 20 carbon atoms, R 8 to R 10 represents a linear divalent hydrocarbon group having 1 to 20 carbon atoms, R 6 to R 10 may represent a same group or different groups, and x, y and z each represent a number of 2 or greater and smaller than 4, which may be an average of numbers.