Patent ID: RE40751

Claim:
A gas- phase process for polymerizing olefin(s) , excluding cyclic olefin(s) , in the presence of a catalyst system comprising a hafnium metallocene catalyst compound having at least one cyclopentadienyl or cyclopentadienyl derived ligand substituted with at least one linear or iso alkyl group having from 3 to 10 carbon atoms, and an activator represented by the formula: ( C 5 H 5-d-f R″ d ) e R′″ f HfQ 4-e wherein ( C 5 H 5-d-f R″ d ) is a substituted cyclopentadienyl ligand bonded to Hf, wherein at least one ( C 5 H 5-d-f R″ d ) is substituted with at least one R″, wherein said R″ is selected from one or more of n - propyl, or n - pentyl, each additional R″, which can be the same or different is hydrogen or a substituted or unsubstituted hydrocarbyl having from 1 to 30 carbon atoms or combinations thereof or two or more carbon atoms are joined together to form a part of a substituted or unsubstituted ring or ring system having 4 to 30 carbon atoms, R′″ is one or more or a combination of the group consisting of carbon, germanium, silicon, phosphorous and nitrogen atoms containing radical bridging two ( C 5 H 5-d-f R″ d ) rings, or bridging one ( C 5 H 5-d-f R″ d ) ring to Hf; each Q which can be the same or different is selected from the group consisting of a hydride, substituted and unsubstituted hydrocarbyl having from 1 to 30 carbon atoms, halogen, alkoxides, aryloxides, amides, phosphides and combination thereof; two Q's together form an alkylidene ligand or cyclometallated hydrocarbyl ligand or other divalent anionic chelating ligand; d is 1 , 2 , 3 , or 4 , f is 0 or 1 , and e is 1 , 2 or 3 , said catalyst system further comprising an activator and a support, wherein the activator and the hafnium metallocene catalyst compound are premixed in a solvent, and then combined with the support and then dried, to produce a free - flowing powder, and wherein the catalyst has a catalyst productivity of greater than 1000 ( g polymer )/( g catalyst*h* 150 psi ) at 85 ° C .