Transition metal bis(phenolate) complexes and their use as catalysts for olefin polymerization
US11254763B2 · kind B2 · utility
0Cited by
3References
35Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 11, 2020 |
| Grant date | Feb 22, 2022 |
| Priority date | — |
| Expiry date | May 6, 2040 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F2/06
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
This invention relates to transition metal complexes of a dianionic, tridentate ligand that features a central neutral heterocyclic Lewis base and two phenolate donors, where the tridentate ligand coordinates to the metal center to form two eight-membered rings. Preferably the bis(phenolate) complexes are represented by Formula (I): where M, L, X, m, n, E, E′, Q, R1, R2, R3, R4, R1′, R2′, R3′, R4′, A1, A1′, are as defined herein, where A1QA1′ are part of a heterocyclic Lewis base containing 4 to 40 non-hydrogen atoms that links A2 to A2′ via a 3-atom bridge with Q being the central atom of the 3-atom bridge.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.