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US 7,683,149 B2Granted
Catalysts for olefin polymerization or oligomerization
AssigneeE. I. Du Pont de Nemours and Company
InventorsAlex S. Ionkin, Lynda Kaye Johnson
Life of this patent
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Abstract
Novel iron and cobalt complexes of certain novel tricyclic ligands containing a “pyridine” ring and substituted with two imino groups are polymerization and/or oligomerization catalysts for olefins, especially ethylene. Depending on the exact structure of the ligand, and polymerization process conditions, products ranging from α-olefins to high polymers may be produced. The polymers, especially polyethylenes, are useful for films and as molding resins.
Claims10
A process for the polymerization or oligomerization of olefins, comprising, contacting one or more olefins of the formula:
- R1CH═CH2 (I),
- with an iron or cobalt complex of a diimine of a diketone of the formula:
- wherein:
- (i) R1 is hydrogen or n-alkyl;
- (ii) m and n are each independently an integer of 1 to 5;
- (iii) each R2 and R3 is independently hydrogen, hydrocarbyl, substituted hydrocarbyl, or a functional group;
- and
- (iv) R4 is hydrogen, hydrocarbyl, substituted hydrocarbyl, or a functional group.
5 more elements
Dependencies are inferred from the claim text.