Method for activating supported chromium oxide catalysts and olefin polymerization process carried out therewith
US5200478A · kind A · utility
6Cited by
15References
7Claims
0Family size
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Key dates
| Filing date | Oct 23, 1991 |
| Grant date | Apr 6, 1993 |
| Priority date | — |
| Expiry date | Oct 23, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F10/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A method for activating supported chromium oxide catalysts in which a chromium-containing catalyst on a silica-containing base is first heated in an oxidizing atmosphere at temperatures up to about 850.degree. C. and then cooled down. During the cooling step of the catalyst, the oxidizing atmosphere is replaced by a non oxidizing one, leading to an activated catalyst. A process for the polymerization of alpha-olefins, especially ethylene, in which at least one alpha-olefin is contacted, under polymerization conditions, with the catalyst activated by the method described above.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.