Patent ID: 7501372
Filing Date: 2009-03-10
Classification: C08F,Y10S

Abstract:
1. A catalyst composition comprising: the contact product of a metallocene compound and a chemically-treated solid oxide, wherein: the metallocene compound has the following formula: wherein M (X wherein each substituent on the substituted cyclopentadienyl, substituted indenyl, or substituted fluorenyl (X (X the chemically-treated solid oxide comprises a solid oxide treated with an electron-withdrawing anion; wherein the solid oxide is selected from silica, alumina, silica-alumina, silica-zirconia, alumina-zirconia, aluminum phosphate, heteropolytungstates, titania, magnesia, boria, zinc oxide, mixed oxides thereof, or mixtures thereof; and the electron-withdrawing anion is selected from fluoride, chloride, bromide, phosphate, triflate, bisulfate, sulfate, or any combination thereof; wherein the catalyst composition is substantially free of an organoaluminum compound having the formula: wherein (X wherein (X wherein n is a number from 1 to 3 inclusive; wherein the catalyst composition is substantially free of cocatalysts, organoboron compounds, and ionizing ionic compounds; and wherein the a polyolefin is produced upon contacting the catalyst composition with an olefin under polymerization conditions.