Process for polymerizing olefins in the presence of an olefin polymerization catalyst
US7851567B2 · kind B2 · utility
1Cited by
6References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 8, 2006 |
| Grant date | Dec 14, 2010 |
| Priority date | — |
| Expiry date | Aug 8, 2026 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F210/16
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention relates to a process for the preparation of multimodal ethylene homo- or copolymers in at least two stages, the process comprising preparation of a first ethylene homo- or copolymer fraction in a loop reactor in slurry phase, preparation of a second ethylene homo- or copolymer fraction in a gas phase reactor, by using a catalyst not containing an inorganic oxide support, and operating the gas phase reactor in such conditions that at least part of the gas is recycled, and that at least a part of the recycled gas is condensed and the (partially) condensed gas is re-introduced into the gas phase reactor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.