Patent ID: 9181371
Filing Date: 2015-11-10
Classification: C08F

Abstract:
1. A method for producing a polyolefin, comprising: contacting one or more olefins with a catalyst system in a polymerization reactor at conditions sufficient to produce a polyolefin, wherein the catalyst system comprises wherein the first metallocene catalyst compound is selected from (tetramethylcyclopentadienyl)(n-propylcyclopentadienyl)zirconium bis(pentafluorophenoxide); bis(n-butylcyclopentadienyl) zirconium bis(pentafluorophenoxide); bis(n-propylcyclopentadienyl) hafnium bis(pentafluorophenoxide); bis(3-n-butyl- 1 -methyl cyclopentadienyl) zirconium bis(pentafluorophenoxide); rac-Me wherein the first metallocene catalyst compound has a catalyst productivity that is at least 20% greater than a comparative metallocene catalyst compound used to produce the same polyolefin at the same conditions, wherein the comparative metallocene catalyst compound is the same as the first metallocene catalyst compound but does not have a leaving group that is a halo-phenoxy or a halo-alkoxy and instead has methyl leaving groups.