Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Halogen or compound containing same
Reexamination Certificate
2005-05-24
2005-05-24
Lotengo, J. A. (Department: 1755)
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Halogen or compound containing same
C502S233000, C502S237000, C502S240000, C502S254000, C502S256000, C502S228000, C502S009000, C516S111000, C423S338000, C526S106000
Reexamination Certificate
active
06897181
ABSTRACT:
The invention relates to a process for preparing a catalyst for the polymerization of olefins, which comprises:a) preparation of a finely divided silica xerogel,b) loading of the xerogel with chromium from a solution of chromium trioxide or a chromium compound which is converted into chromium trioxide under the conditions of step c), andc) activation of the resulting product at from 400 to 1100° C. in a water-free gas stream comprising oxygen in a concentration of above 10% by volume,wherein a fluoride doping with a fluorinating agent is carried out in step b) or in step c). Furthermore, the invention relates to a catalyst for the polymerization of olefins which is obtainable by the process of the invention and to a process for the polymerization of olefins in which an olefin or an olefin mixture is polymerized in the presence of a catalyst according to the invention.
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Deckers Andreas
Kölle Peter
Lux Martin
Mihan Shahram
Rohde Wolfgang
Basell Polyolefine GmbH
Connolly Bove & Lodge & Hutz LLP
Hailey Patricia L.
Lotengo J. A.
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