Patent ID: 7501372

Claim:
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: (X 1 )(X 2 )(X 3 )(X 4 )M 1 ; wherein M 1 is selected from titanium, zirconium, hafnium, or vanadium; (X 1 ) is selected from a cyclopentadienyl, an indenyl, a fluorenyl, a substituted cyclopentadienyl, a substituted indenyl, or a substituted fluorenyl; wherein each substituent on the substituted cyclopentadienyl, substituted indenyl, or substituted fluorenyl (X 1 ) is independently selected from an aliphatic group, an aromatic group, a cyclic group, a combination of aliphatic and cyclic groups, an oxygen group, a sulfur group, a nitrogen group, a phosphorus group, an arsenic group, a carbon group, a silicon group, a germanium group, a tin group, a lead group, a boron group, an aluminum group, —SO 2 X, —OAlX 2 , —OSiX 3 , —OPX 2 , —SX, —OSO 2 X, —AsX 2 , —As(O)X 2 , or —PX 2 , wherein X is selected independently from halide, H, NH 2 , OR, or SR, wherein R is a hydrocarbyl, or a substituted derivative thereof, having from 1 to about 20 carbon atoms; a halide; or hydrogen; and (X 2 ),(X 3 ), and (X 4 ) are independently selected from a hydrocarbyl group or a substituted hydrocarbyl group, having from 1 to about 20 carbon atoms; and 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: Al(X 5 ) n (X 6 ) 3−n wherein (X 5 ) is a hydrocarbyl having from 1 to about 20 carbon atoms; wherein (X 6 ) is a halide, hydride, or alkoxide; and 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.