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US 5,688,734 AGranted
Method for producing prepolymerized, supported metallocene catalyst systems
AssigneesExxon Chemical Patents Inc., Hoechst Aktiengesellschaft
InventorsAnthony Nicholas Speca, Kelly Tormaschy
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Abstract
The invention relates to a supported, prepolymerized metallocene catalyst system as well as its production and use in olefin polymerization. The method for producing the prepolymerized catalyst system involves prepolymerizing a metallocene catalyst system containing a volume of solution that is the equivalent of or less than the total pore volume of the supported catalyst system.
Claims16
A method for forming a prepolymerized supported metallocene catalyst system, said method comprising the steps of:
- (a) forming a reaction product of metallocene and alkylalumoxane in a hydrocarbon solvent;
- (b) contacting a volume of the reaction product with a porous support;
- (c) drying the resulting supported catalyst system such that at least 90% of all solvent is removed from the pores of the porous support;
- (d) contacting the dried supported catalyst system of step (c) with a volume of hydrocarbon solution wherein the volume is equal to or less than the total pore volume of the porous support;
- (e) prepolymerizing the supported catalyst system with gaseous monomer;
- and
- (f) recovering prepolymerized supported catalyst system.
4 more elements
Dependencies are inferred from the claim text.