Patent ID: 8481644

Claim:
A composition comprising a coupled interpolymer comprising one or more monomeric units derived from a diene and coupled using a tetraalkoxysilane coupling agent, wherein the coupled interpolymer is characterized by: (A) a halide content of less than about 30 ppm based on the total weight of the coupled interpolymer; (B) a molecular weight distribution of from 1.6 to 2.4; (C) a vinyl content of from 5 to 15 weight percent based on the total weight of the coupled interpolymer; (D) a Mooney viscosity of from 40 to 80, free of the coupled interpolymer, as measured without oil, from 40 to 80; (E) an M z+1 of from 1000 to 1300 kg/mol measured according to polystyrene standards; and (F) a plot of dw/dlogM versus logM having a single peak.