ALUMINUM-FREE MONOCYCLOPENTADIENYL METALLOCENE CATALYSTS FOR OLEFIN POLYMERIZATION

摘要

The invention is a catalyst system including a Group IV-B transition metal component and an activator component which may be employed to polymerize olefins to produce a high molecular weight polymer. The Group IV-B transition metal compo- nent contains a single cyclopentadienyl ligand and a single heteroatom ligan d, which ligands may be bridged one to another; the activator component comprises a cation, which may be a Bronsted acid capable of donating a proton (hereafter denoted as L'-H wherein L' is a neutral Lewis base and H is hydrogen), and a compatible noncoordinating anion.