Processes for reducing the loss of catalyst activity of a Ziegler-Natta catalyst
US11311870B2 · kind B2 · utility
0Cited by
10References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 13, 2017 |
| Grant date | Apr 26, 2022 |
| Priority date | — |
| Expiry date | May 6, 2038 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J2531/46
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for reducing the loss of catalyst activity of a Ziegler-Natta catalyst is provided. The process includes preparing a Ziegler-Natta (ZN) catalyst by contacting the ZN catalyst with at least one aluminum alkyl compound to produce a reduced ZN catalyst and storing and/or transporting the reduced ZN catalyst for at least 20 days at a temperature of 25° C. or less. The reduced ZN catalyst may be used for polymerizing polyolefin polymers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.