Prealkylated olefin polymerization catalysts and olefin polymerization employing such catalysts
AssigneeEquistar Chemicals, LP
InventorsCraig C. Meverden, Michael W. Lynch
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Abstract
Prealkylation of a supported catalyst system comprising a transition metal or inner transition metal complex precatalyst and a bulky, non-coordinating anion on an inorganic support by treatment with a solution of metal alkyl in a ratio of metal of metal alkyl to transition metal or inner transition metal of precatalyst less than 20:1, and in an amount of solution insufficient to form a paste or dispersion provides supported catalysts of high olefin polymerization activity which promote production of polyolefins of low polydispersity and improved morphology.
Claims20
A prealkylated supported olefin polymerization catalyst prepared by the process of
- a) supplying a finely divided porous support material having deposited thereon catalyst system components comprising a transition metal or inner transition metal complex single site precatalyst and a bulky, non-coordinating anion activator;
- b) prealkylating said finely divided support material with a solution of metal alkyl dissolved in organic solvent in a mol ratio of metal of the metal alkyl to transition metal or inner transition metal of the precatalyst of less than 20:1, wherein the solution volume at any given time does not exceed the pore volume of the silica by an extent which would create a paste or dispersion, to form a prealkylated catalyst;
- and
- c) optionally drying said prealkylated catalyst to remove organic solvent.
Dependencies are inferred from the claim text.