Heterogeneous methylaluminoxane catalyst system
AssigneeEthyl Corporation
InventorSamuel A. Sangokoya
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Abstract
A heterogeneous catalyst composition comprising a primary catalyst such as a metallocene and a methylaluminoxane, at least about 10 percent but less than about 40 percent of the total aluminum value in the methylaluminoxane being soluble in toluene at 25.degree. C.
Claims8
A heterogeneous catalyst composition comprising the reaction product of a metallocene catalyst and a methylaluminoxane, at least about 10 percent but less than about 40 percent of the total aluminum value in said methylaluminoxane being soluble in toluene at 25.degree. C., said methylaluminoxane being the partially soluble and insoluble methylaluminoxane materials prepared by the fractionation of a methylaluminoxane solution by adding an aliphatic solvent to a methylaluminoxane solution in an aromatic solvent so as to cause said partially soluble and insoluble methylaluminoxane materials to separate as a solid from said solution.
A process for making a heterogeneous catalyst composition comprising reacting a metallocene catalyst with a methylaluminoxane, at least about 10 percent but less than about 40 percent of the total aluminum value in said methylaluminoxane being soluble in toluene at 25.degree. C., said methylaluminoxane being the partially soluble and insoluble methylaluminoxane materials prepared by the fractionation of a methylaluminoxane solution by adding an aliphatic solvent to a methylaluminoxane solution in an aromatic solvent so as to cause said partially soluble and insoluble methylaluminoxane materials to separate as a solid from said solution.
Dependencies are inferred from the claim text.