Method for preparing metallocene catalyst systems
AssigneesExxon Chemicals Patents Inc., Hoechst Aktiengesellschaft
InventorsTerry J. Burkhardt, William B. Brandley
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Abstract
This invention is generally directed toward a method for producing metallocene catalyst systems. Specifically, the method involves removing solid impurities from a solution of activated metallocene wherein activation has the effect of solubilizing the metallocene but not the impurities. The resulting catalyst system is higher in activity and produces polymer having excellent particle morphology with little or no reactor fouling.
Claims8
A method for producing a metallocene catalyst system, said method comprising the steps of:
- 1) providing one or more metallocene compounds;
- 2) combining the metallocene compound(s) with an alkylalumoxane in a solvent to form a metallocene catalyst system solution;
- and then
- 3) removing insoluble impurities from the solution.
A method for producing a metallocene catalyst system, said method comprising the steps of:
- (a) activating one or more metallocene compounds having limited solubility in a hydrocarbon solution thereby solubilizing the metallocene compound(s);
- then
- (b) filtering the solution;
- (c) combining the solution with support material;
- and
- (d) recovering activated metallocene catalyst system.
A method for producing a supported metallocene catalyst system, said method comprising the steps of:
- (a) combining in a hydrocarbon solvent, one or more metallocene compounds having limited solubility in the solvent with an activator to form a solution;
- then
- (b) removing solid components from the solution;
- then
- (c) combining the solution with a support material;
- and
- (d) recovering active, supported metallocene catalyst system.
Dependencies are inferred from the claim text.