Methods for producing polyolefins with catalyst systems
US9181371B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 6, 2012 |
| Grant date | Nov 10, 2015 |
| Priority date | — |
| Expiry date | Nov 6, 2032 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F2500/05
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Described herein are methods comprising contacting one or more olefins with a catalyst system in a polymerization reactor at conditions sufficient to produce a polyolefin, wherein the catalyst system comprises a first metallocene catalyst compound comprising a first transition metal atom, two cyclopentadienyl ligands bound to the first transition metal atom, and two leaving groups bound to the first transition metal atom, wherein at least one leaving group is selected from the group consisting of a halo-phenoxy and a halo-alkoxy; wherein the first metallocene catalyst compound has a catalyst productivity that is at least 20% greater than a comparative metallocene catalyst compound used to produce the same polyolefin, wherein the comparative metallocene catalyst compound is the same as the first metallocene catalyst compound except neither leaving group is a halo-phenoxy or a halo-alkoxy.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.