Hydrocarbyl phosphinimine/cyclopentadienyl complexes of group IV metals and preparation thereof
AssigneeNOVA Chemicals (International) S.A.
InventorsRupert Edward von Haken Spence, Stephen John Brown, Ryan Paul Wurz, Dusan Jeremic, Douglas W. Stephan
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Abstract
New group 4 organometallic complexes are characterized by having a phosphinimine ligand and two or more cyclopentadienyl ligands. Certain of these complexes exhibit unusual behavior when examined by nuclear magnetic resonance (NMR) techniques. Well defined crystals of the inventive complexes have been isolated and analyzed by x-ray crystallography. The complexes have also been found to be polymerization catalysts which are surprisingly more active than their simple metallocene analogs.
Claims5
An organometallic complex defined by the formula:
- wherein M is a group 4 metal in oxidation state 4;
- each Cp is selected from the group consisting of unsubstituted cyclopentadienyl, substituted cyclopentadienyl, unsubstituted indenyl, substituted indenyl, unsubstituted fluorenyl and substituted fluorenyl;
- each of R1, R2 and R3 is a hydrocarbyl group which is bonded to phosphorus by a carbon-phosphorus single bond;
- n is 2 or 3 and n+p=3;
- and
- when p=1, L is a monoanionic ligand.
Dependencies are inferred from the claim text.