Iron catalyst for the polymerization of olefins
AssigneeE. I. Du Pont de Nemours and Company
InventorAlison Margaret Anne Bennett
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Abstract
Catalysts based on iron complexes of 2,6-pyridinecarboxaldehydebis(imine) and 2,6-diacylpyridine-bis(imine) tridentate ligands are provided, which are particularly suitable for the polymerization of olefins.
Claims19
A catalyst composition comprising a complex of Fe or Fe with one molecule of a tridentate ligand selected from the group consisting of a 2,6-pyridinecarboxaldehydebis(imine) and a 2,6-diacylpyridine-bis(imine), in which the tridentate ligand causes steric crowding about the Fe or Fe.
A catalyst composition adapted for the polymerization of ethylene, comprising a complex of Fe or Fe with one molecule of a tridentate ligand selected from the group consisting of a 2,6-pyridinecarboxaldehydebis(imine) and a 2,6-diacylpyridinebis-(imine), in which the tridentate ligand causes steric crowding about the Fe or Fe, and in which the Fe or Fe also has (i) an empty coordination site or bonded to it a ligand that may be displaced by ethylene, and (ii) bonded to it a ligand that may add to ethylene.
A process for the polymerization of ethylene, comprising the step of contacting, at a temperature of about −100° C. to about +200° C., an active polymerization catalyst with ethylene, wherein the active polymerization catalyst comprises a complex of Fe or Fe with a tridentate ligand selected from the group consisting of a 2,6-pyridinecarboxaldehydebis(imine) and a 2,6-diacylpyridinebis(imine), in which the tridentate ligand causes steric crowding about the Fe or Fe.
Dependencies are inferred from the claim text.