Oil extended rubber and composition containing low pca oil

摘要

The invention is directed to an oil extended rubber and composition comprising a solution-polymerized polybutadiene. The polybutadiene is coupled with at least one metal selected from the group consisting of silicon and tin. The oil extended rubber further comprises from 5 to 70 parts by weight, per 100 parts by weight of elastomer (phr), of a process oil having a glass transition temperature of from -80°C to -40°C, a polycyclic aromatic content of less than 3 percent by weight as determined by the IP346 method, and an aromatic content of less than 20 percent by weight as measured by ASTM D2140.