Process for polymerizing ethylene in a multi-stage polymerization process
US12043687B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 1, 2019 |
| Grant date | Jul 23, 2024 |
| Priority date | — |
| Expiry date | Jul 9, 2041 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/54
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention is concerned with a process for polymerizing ethylene or copolymerizing ethylene and at least one alpha-olefin comonomer in the presence of a supported polymerization catalyst in a multi-stage process in which the last polymerization stage is a gas phase reactor, the use of said process for reducing particle carry-over in the last polymerization stage and the use of a supported polymerization catalyst with a certain median particle size to polymerize an ethylene homo- or copolymer in said multi-stage process with a span of its particle size distribution which can be predicted from the median particle size of the catalyst.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.