Patent ID: 8754156

Claim:
A compounding agent for rubber, said compounding agent containing a thioester group-containing organosilicon compound (A) of formula (5) wherein: R 6 is independently an alkyl group containing 1 to 20 carbon atoms optionally having an intervening oxygen atom, an alkenyl group containing 2 to 10 carbon atoms, an aryl group containing 6 to 10 carbon atoms, or an acyl group containing 1 to 20 carbon atoms; n is an integer of 1 to 3; R 5 is independently an alkyl group containing 1 to 10 carbon atoms or an aryl group containing 6 to 10 carbon atoms; p is an integer of 1 to 10; B is a straight, branched, or cyclic divalent hydrocarbon group; and Y is a structure represented by formula (6) wherein: the wavy line represents a bond; m is 0, 1, or 2; and R 5 , R 6 , B, and p are as defined above, and containing a thioester group-containing organosilicon compound (A) of formula (5a) wherein R 6 , n, R 5 , p, and B are as defined above, wherein said compounding agent is formed by esterification between a carboxyl group and a hydrolyzable silyl group in the same or a different molecule.