Olefin polymerization using silyl-bridged metallocenes
AssigneePhillips Petroleum Company
InventorsSyriac J. Palackal, Helmut G. Alt, Konstantinos Patsidis, Tara G. Hill, Gil R. Hawley, Peter P. Chu, M. Bruce Welch, Rolf L. Geerts
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Abstract
Fluorenyl-containing silyl bridged metallocenes, the process of using such metallocenes to polymerize olefins, and the resulting unusual syndiotactic polypropylene are disclosed.
Claims14
A process for polymerizing an olefin having at least 3 carbon atoms comprising contacting said olefin under suitable polymerization conditions with a catalyst system comprising a bridged sandwich-bonded metallocene of a metal selected from Group IV of the Periodic Table, said metallocene being selected from bridged sandwich-bonded metallocenes of a metal selected from Group IV of the Periodic Table in which the organic ligand is selected from compounds of the formula ##STR5## wherein Z and Z' are different, Z is an unsubstituted fluorenyl radical or a symmetrically substituted fluorenyl radical and Z' is an unsubstituted cyclopentadienyl radical, a symmetrically substituted cyclopentadienyl radical, an unsubstituted fluorenyl radical, or a symmetrically substituted fluorenyl radical;
- each R' is the same or different organo radical having 1 to 20 carbon atoms.
Dependencies are inferred from the claim text.