Complexes based on four-membered cyclic anionic six-electron-donor ligands
AssigneeEquistar Chemicals, LP
InventorSandor Nagy
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Abstract
A single-site olefin polymerization catalyst and method of making it are disclosed. The catalyst comprises an activator and an organometallic complex. The complex comprises a Group 3 to 10 transition metal, M, and at least one anionic heterocyclobutenyl ligand that is bonded to M. Molecular modeling results indicate that single-site catalysts based on anionic heterocyclobutenyl ligands will have advantages compared with the performance of catalysts based on cyclopentadienyl and substituted cyclopentadienyl ligands.
Claims18
A catalyst which comprises:
- (a) an activator;
- and
- (b) an organometallic complex comprising a Group 3 to 10 transition metal, M, and at least one anionic heterocyclobutenyl ligand that is bonded to M.
A method which comprises reacting a synthetic equivalent of a heterocyclobutenyl anion with a Group 3 to 10 transition metal source to produce an organometallic complex comprising the metal, M, and at least one heterocyclobutenyl ligand that is bonded to M.
Dependencies are inferred from the claim text.