Patent ID: 8481649

Claim:
A coupled copolymer coupled by reacting a silane coupling agent with a copolymer, wherein the copolymer is polymerized by a conjugated diene monomer and a vinyl aromatics monomer, and the silane coupling agent has an alkenyl group and a alkoxy group, and has a chemical Formula (I) as follows: wherein: R 1 and R 4 are alkyl groups; R 3 is a group having an alkenyl group; R 5 is one selected from a group consisting of an alkoxy, an alkyl and an alkenyl groups; q is one of “1” and “0”; when q=0, then k=j=0, 1≦n≦3, 0≦m≦2, m+n=3, and R 2 is an alkoxy group; when q=1, then k+j=3, R 2 is —(CH 2 ) r , r=1-6 and m+n=3; and the coupled copolymer comprises a four-arm coupled copolymer in a range of 10-30 weight percent of the coupled copolymer.