Patent ID: 6218488
Filing Date: 2001-04-17
Classification: C08F,C08L,Y10S

Abstract:
A polymerization process for ethylene copolymers having a density less than 0.915 comprising contacting ethylene, one or more .alpha.-olefin monomer, and optionally one or more diene monomer, with a catalyst composition comprising the reaction product of at least one organometallic Group 4 metallocene compound derived from a bridged, fused-ring ligand containing biscyclopentadienyl hafnocene, said bridge being a substituted or unsubstituted carbon or silicon atom connecting tie biscyclopentadienyl ligands, and a salt of a Group 13 element anionic complex having halogenated aromatic ligands in an essentially tetrahedral structure wherein the aromatic groups are polycyclic fused or polycyclic pendant aromatic rings.