Molecular weight control of polyolefins using halogenated bis-phenylphenoxy catalysts
US9605098B2 · kind B2 · utility
18Cited by
6References
3Claims
0Family size
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Key dates
| Filing date | Jun 26, 2014 |
| Grant date | Mar 28, 2017 |
| Priority date | — |
| Expiry date | Jun 26, 2034 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F4/65912
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for preparing an olefin homopolymer or copolymer comprises contacting ethylene, an alpha-olefin, or a combination, and a catalytic amount of a metal-ligand complex catalyst of a particular formula that requires at least one halogen atom that is ortho to a bridging moiety. The strategic location of the halogen atom(s) ensures a product having a molecular weight that is predictably and significantly reduced in comparison with that of copolymers produced using otherwise identical metal-ligand complex catalysts that lack halogen atoms at the specified sites.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.