Patent ID: 7332456

Claim:
A catalyst system useful for the polymerization of an alpha olefin comprising a chiral, stereorigid metallocene catalyst component having the formula: R″(C 5 R′ m ) 2 MeQ 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 or different and wherein a first R′ is a phenyl group and then (C 5 R′ m ) forms a substituted indenyl group, a second R′, a third R′, and a fourth R′ may be the same or different hydrocarbyl radicals having from 1-20 carbon atoms each and wherein one or more of such second R′, third R′, and fourth R′ substitute on the indenyl group; R″ is 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 a halogen; Me is a group 4 b , 5 b , or 6 b metal as designated in the Periodic Table of Elements; 0<m≦4; and 0≦p≦3; and a cocatalyst component effective to activate said metallocene catalyst component.