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US 7,442,819 B2Granted
Catalysts for olefin polymerization or oligomerization
AssigneeE. I. Du Pont de Nemours and Company
InventorsAlex Sergey Ionkin, Lynda Kaye Johnson
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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.
Claims6
An iron or cobalt complex of a ligand of the formula
- wherein:
- m and n are each independently an integer of 2 to 5;
- each R2 and R3 is independently hydrogen, hydrocarbyl, substituted hydrocarbyl, or a functional group;
- R4 is hydrogen, hydrocarbyl, substituted hydrocarbyl, or a functional group;
- and
- R5 and R6 are each independently hydrocarbyl or substituted hydrocarbyl.
3 more elements
Dependencies are inferred from the claim text.