| abstract |
The invention comprises a catalyst system and a method using this catalyst system for the production of high molecular weight polyolefins, especially polyethylene and higher poly-alpha-olefin, as well as copolymers of ethylene and / or alpha- olefins with other unsaturated monomers, including diolefins, acetylenically unsaturated monomers and cyclic olefins. The catalyst system comprises three components, a Group IV B monocyclopentadienyl transition metal compound, an alumoxane, and a modifier. The catalyst system is very active, at low ratios between aluminum and the group IV B transition metal, and thus catalyzes the production of a polyolefin product containing low levels of metal residue from the catalyst. |