Patent ID: 8030241

Claim:
A process to produce a catalyst composition, the process comprising: contacting at least one ansa-metallocene, at least one organoaluminum compound, and at least one olefin for a first period of time to form a precontacted mixture; and contacting the precontacted mixture with at least one chemically-treated solid oxide and optionally an additional organoaluminum compound for a second period of time to form a postcontacted mixture; wherein the chemically-treated solid oxide comprises a solid oxide treated with an electron-withdrawing anion, wherein: the solid oxide comprises silica, alumina, silica-alumina, aluminum phosphate, heteropolytungstate, titania, zirconia, magnesia, boria, zinc oxide, a mixed oxide thereof, or a mixture thereof; and the electron-withdrawing anion comprises fluoride, chloride, bromide, phosphate, triflate, bisulfate, sulfate, or any combination thereof.