Zirconium-titanium catalyzed olefin polymerization
AssigneePhillips Petroleum Company
InventorsMelvin B. Welch, Richard E. Dietz
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Abstract
Olefins such as ethylene can be polymerized in high productivities using a catalyst system wherein one catalyst component comprises a precipitated complex of zirconium tetrahydrocarbyloxide and/or titanium tetrahydrocarbyloxide and dihydrocarbylmagnesium. The productivity of the preferred catalyst containing both zirconium and titanium has been found to be substantially higher than the productivity of those catalysts obtained from either only Zr(OR').sub.4 or only Ti(OR").sub.4 and second catalyst component comprises at least one organometallic compound of a metal selected from the Groups I-III of the Mendeleev Periodic Table.
Claims6
Process for polymerizing olefin comprising contacting said olefin under polymerization conditions with a catalyst comprising components A and B wherein component A is a precipitate produced by mixing a solution of a product in a solvent with a titanium tetrahalide, said product being obtained by reacting the following components:
- (a) Zr(OR').sub.4 and Ti(OR").sub.4
- (b) MgR.sub.2 "'
- wherein R', and R" and R'" are hydrocarbyl radicals of 1 to about 20 carbon atoms and wherein component B is a cocatalyst of one or more organometallic compounds of at least one metal of Groups I, II, or III of the Mendeleev Periodic Table.
Dependencies are inferred from the claim text.