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US 5,447,895 AGranted
Sterically shielded diboron-containing metallocene olefin polymerization catalysts
AssigneeNorthwestern University
InventorsTobin J. Marks, Li Ja, Xinmin Yang
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Abstract
A non-coordinating anion, preferably containing a sterically shielded diboron hydride, if combined with a cyclopenta-dienyl-substituted metallocene cation component, such as a zirconocene metallocene, is a useful olefin polymerization catalyst component. The anion preferably has the formula ##STR1## where R is branched lower alkyl, such as t-butyl.
Claims12
A catalyst system which is useful in olefin polymerization and which comprises:
- (1) a cyclopentadienyl-substituted metallocene cation component;
- and (2) a non-coordinating anion, which is a sterically shielded diboron-containing anion.
Dependencies are inferred from the claim text.