Metallocene catalyst systems
AssigneeFina Technology, Inc.
InventorJohn A. Ewen
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Abstract
A catalyst system for polymerization of olefins having increased molecular weight and melting point is disclosed. A chiral, stereorigid metallocene compound having a silicon hydrocarbyl compound as an interannular bridge between two cyclopentadienyl or substituted cyclopentadienyl rings described by the formula (C.sub.5 R'.sub.m) wherein R' is hydrogen or hydrocarbyl radical having from 1-20 carbon atoms, each R' being the same or different, is combined with an organoaluminum compound. The cyclopentadienyl ligands are coordinated with a metal of a group 4b, 5b, or 6b metal as designated in the Periodic Table of Elements. The metal is also bonded to a hydrocarbon radical or a halogen.
Claims12
A catalyst system for polymerization of propylene having increased molecular weight and melting point comprising
- (a) a chiral, stereorigid metallocene catalyst described by the formula:
- R"(C.sub.5 R'.sub.m).sub.2 Me Q.sub.p
- wherein (C.sub.5 R'.sub.m) is a cyclopentadienyl or substituted cyclopentadienyl;
- R' is hydrogen or hydrocarbyl radical having from 1-20 carbon atoms, each R' may be the same or different;
- R" is a silicon hydrocarbyl radical and acts as an interannular bridge between the two (C.sub.5 R'.sub.m) 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.ltoreq.m.ltoreq.4;
- and 0.ltoreq.p<3;
- and
- (b) an organoaluminum compound.
Dependencies are inferred from the claim text.