Transition metal catalytic systems and methods for preparing ethylene homopolymers or copolymers of ethylene and α-olefins using the same
US8372996B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 24, 2009 |
| Grant date | Feb 12, 2013 |
| Priority date | — |
| Expiry date | Sep 25, 2029 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07F17/00
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Provided are transition metal catalytic systems for preparing ethylene homopolymers or copolymers of ethylene with α-olefins. More specifically, provided are Group 4 transition metal catalysts, which is characterized in that the Group 4 transition metal catalyst comprises around the Group 4 transition metal a cyclopentadiene derivative, and at least one naphthoxide ligand(s) having aryl substituent(s) that function(s) as an electron donor and serve(s) to stabilize the catalyst system by surrounding an oxygen atom that links the ligand to the transition metal at 2-position, and there is no cross-linkage between the ligands; catalytic systems comprising such transition metal catalyst and aluminoxane cocatalyst or boron compound cocatalyst; and processes for preparing ethylene homopolymers or copolymers of ethylene with α-olefins by using the same.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.