Supported chromium oxide catalyst for the production of broad molecular weight polyethylene
US6989344B2 · kind B2 · utility
31Cited by
18References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 18, 2003 |
| Grant date | Jan 24, 2006 |
| Priority date | — |
| Expiry date | Nov 18, 2023 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S526/901
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The present invention is directed to the use of aluminum alkyl activators and co-catalysts to improve the performance of chromium-based catalysts. The aluminum alkyls allow for the variable control of polymer molecular weight, control of side branching while possessing desirable productivities, and may be applied to the catalyst directly or separately to the reactor. Adding the alkyl aluminum compound directly to the reactor (in-situ) eliminates induction times.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.