Process for preparing propylene homopolymers and copolymers
US6455643B1 · kind B1 · utility
38Cited by
7References
30Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 24, 1998 |
| Grant date | Sep 24, 2002 |
| Priority date | — |
| Expiry date | Jun 24, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S526/905
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Described herein is a process and an apparatus for preparing propylene homopolymers and copolymers, which comprises polymerizing propylene optionally with comonomers in the presence of a catalyst at elevated temperature and pressure in at least one slurry reactor and at least one gas phase reactor, the polymerization product of at least one slurry reactor, containing unreacted monomers, being conducted to a first gas phase reactor essentially without recycling of the unreacted monomers to the slurry reactor. The invention provides for fast start-ups because the gas phase bed material is available directly from the loop reactor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.