Olefin polymerization catalyst

Details Olefin polymerization catalyst Olefin polymerization catalyst

1981-04-02

1983-08-09

Dees, Carl F.

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

252467, B01J 2106, B01J 2326

Patent

active

043977693

ABSTRACT:
A supported chromium oxide polymerization catalyst is prepared by a process which includes the steps of heating silica-supported chromium oxide or a substance oxidizable to chromium oxide in a nonoxidizing atmosphere in the presence of formaldehyde or a compound thermally decomposable to formaldehyde, and then heating the thus-treated catalyst in an oxygen-containing atmosphere. The temperatures of the respective heating steps can vary depending upon the properties desired in the polymer to be produced with the invention catalyst; however, the invention catalyst preparation method enables the production of a catalyst having a high melt index potential at relatively low treatment temperatures, e.g. no higher than about 600.degree. C.

REFERENCES:
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patent: 3879362 (1975-04-01), Chalfont et al.
patent: 3887494 (1975-07-01), Dietz
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patent: 4041224 (1977-08-01), Hoff et al.
patent: 4151122 (1979-04-01), McDaniel et al.
patent: 4177162 (1979-12-01), McDaniel et al.
patent: 4182815 (1980-01-01), McDaniel et al.

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