Patent ID: 9493629
Filing Date: 2016-11-15
CPC Classification: C08C,C08K,Y02T

Claim Text:
1. An oil-extended polymer composition comprising 100 parts by weight of (A) a butadiene-based polymer, and from 20 to 60 parts by weight of (B) an extender oil, wherein said (A) butadiene-based polymer has a number average molecular weight Mn of 500,000 to 700,000, a molecular weight distribution Mw/Mn of 1.8 to 2.3, and wherein said (A) butadiene-based polymer has a polymer component having a molecular weight of 100,000 or more, a molecular weight distribution of said polymer component is monomodal, and a vinyl content of the butadiene unit of 20 to 80 mol %, and wherein 50 wt % or more of the polymer (A) is a functional group-containing polymer component to be is adsorbed to silica, and wherein the polymer (A) is formed from a polymerization reaction continuously performed in two or more connected reactors.