Patent ID: 6872790

Claim:
A polymer product comprising an isotactic polymer produced by the polymerization of an alpha olefin in the presence of a catalyst system comprising a transition metal component in the form of a chiral, stereorigid metallocene having the formula: R″(C 5 R′ m ) 2 Me Q p wherein (C 5 R′ m ) is a substituted cyclopentadienyl group in which R′ is a hydrogen or a hydrocarbyl radical having from 1-20 carbon atoms, each R′ being the same o different, and R″ is a silicon hydrocarbyl radical acting as an interannular bridge between the two (C 5 R′ m ) rings, provided that at least one R′ is a hydrocarbyl radical imparting chirality to said stereorigid metallocene, Q is a hydrocarbon radical chosen from the group consisting of an aryl, alkyl, alkenyl, alkylaryl and arylalkyl radical having 1-20 carbon atoms or is halogen; Me is a group 4b, 5b, or 6b metal as designated in the Periodic Table of Elements; 1≦m≦4; and 0≦p≦3.