Patent ID: 6649712
Filing Date: 2003-11-18
Classification: C07F,C08F,Y10S

Abstract:
A process for the polymerization of an alpha olefin comprising:a) providing a catalyst component comprising a chiral, stereorigid metallocene produced by the process of adding: i) a compound of the formula MeQp+2; ii) a silicon hydrocarbyl compound; and iii) a substituted cyclopentadiene of the formula (C5Râ€²m) to form a compound of the formula: Râ€³(C5Râ€²m)2 Me Qp wherein Râ€² is hydrogen and (C5Râ€²m) is cyclopentadienyl or Râ€² is hydrogen or a hydrocarbyl radical having from 1-20 carbon atoms, each Râ€² being the same or different and (C5Râ€²m) is substituted cyclopentadienyl; Râ€³ is a silicon hydrocarbyl radical and acts as an interannular bridge between the two (C5Râ€²m) rings; 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 4b, 5b, or 6b metal as designated in the Periodic Table of Elements 0&lE;m&lE;4 and 0&lE;p&lE;3; and b) contacting an alpha olefin monomer under polymerization conditions with said metallocene catalyst component.