Patent ID: 6300433
Filing Date: 2001-10-09
Classification: C07F,C08F

Abstract:
A polymerization process for prepareing ethylene copolymers having a density of 0.850-0.930 g/ml comprising contacting, under homogeneous polymerization conditions at a reaction temperature from 60.degree. C. to 250.degree. C., ethylene and one or more comonomers with a hafnocene catalyst complex derived froma) a biscyclopentadienyl hafnium organometallic compound having(i) at least one unsubstituted cyclopentadienyl ligand or aromatic fused-ring substituted cyclopentadienyl ligand,(ii) one aromatic fused-ring substituted cyclopentadienyl ligand,(iii) and a covalent bridge connecting the two cyclopentadienyl ligands, said bridge comprising a single carbon or silicon atom with two aryl groups, each aryl group substituted with either, a C.sub.1 -C.sub.20 hydrocarbyl group at least one of which is a linear C.sub.3 or greater substituting; andb) an activating cocatalyst compound.