Dutch Polymer Institute

Winfried Peter Kretschmer

The invention relates to a catalyst component and a catalyst system for the preparation of high molecular weight ethylene or alpha-olefin homopolymers, ethylene-alpha-olefin copolymers, terpolymers or tetrapolymers, in a polymerization process, which is expediently effected in solution, at elevated temperature, preferably at least 80 DEG C. The catalyst system comprises a group 4-6 metal, preferably group 4 metal, a cyclic ligand (such as a cyclopentadienyl-type ligand), which forms a delocalized pi-bond with the metal M, a monohapto bonded 1,3-diaza-2-imino heterocyclic ligand (such as an iminoimidazolidine-type ligand) and anionic ligands and a catalyst activator coupound.

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Groningen, Netherlands

Winfried Peter Kretschmer