Catalyst having a ketimide ligand
AssigneeNOVA Chemicals (International) S.A.
InventorsJohn McMeeking, Xiaoliang Gao, Rupert Edward von Haken Spence, Stephen John Brown, Dusan Jeremic
Life of this patent
Estimating the term…
Abstract
A catalyst system comprises an organometallic complex of a group 4 metal having a ketimide ligand. The organometallic complex preferably also contains a cyclic ligand which forms a delocalized pi-bond with the metal (such as a cyclopentadienyl-type ligand). Preferred organometallic complexes may be activated with a so-called "substantially non coordinating anion" to form a low cost cocatalyst system which is excellent for the preparation of olefin copolymers having both high molecular weight and very low density.
Claims6
A process for the copolymerization of ethylene and at least one additional alpha olefin having from 3 to 8 carbon atoms characterized in that said process employs a catalyst system for olefin polymerization comprising:
- a) a catalyst which is an organometallic complex of a group 4 metal;
- and
- b) an activator, characterized in that such organometallic complex contains a ketimide ligand.
Dependencies are inferred from the claim text.