Organometallic complex, olefin polymerization catalyst system and polymerization process
US12275751B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 19, 2024 |
| Grant date | Apr 15, 2025 |
| Priority date | — |
| Expiry date | Apr 19, 2044 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F2420/06
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Organometallic complexes are described which are useful as pre-polymerization catalysts which may form part of olefin polymerization catalyst systems. The catalyst systems find use in the polymerization of ethylene, optionally with one or more C3-12 alpha-olefin comonomers. The organometallic complexes are broadly represented by formula I: wherein L is a bridging group containing a contiguous chain of atoms connecting P with Cy, wherein the contiguous chain contains 2 or 3 atoms and wherein Cy is a cyclopentadienyl-type ligand. The olefin polymerization catalyst system is effective at polymerizing ethylene with alpha-olefins in a solution phase polymerization process at high temperatures and produces ethylene copolymers with high molecular weight and high degrees of alpha-olefin incorporation. Pre-metallation compounds, metallation processes and synthetic methods to make the organometallic complexes as well as polymerization processes are also described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.