Impregnated second valence chromium compound in supported cataly

Details Impregnated second valence chromium compound in supported cataly Impregnated second valence chromium compound in supported cataly

1981-11-03

1983-01-18

Levin, Stanford M.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

252430, 252458, 526118, 5263482, 5263486, 526352, 5263522, C08F 422, C08F 478

Patent

active

043692958

ABSTRACT:
A chromium catalyst supported on a silica-containing base is prepared having chromium present in both the hexavalent state and a lower valent state by anhydrously impregnating a second chromium compound onto the base which already has a chromium compound having a different chromium valence than said second chromium compound. For instance, a silica titanium cogel containing a chromium compound calcined to give hexavalent chromium can be anhydrously impregnated with a .pi.-bonded organochromium compound such as dibenzene chromium or dicumene chromium. Resulting polymers have broad molecular weight distribution and can be made in slurry systems at a sufficiently high melt flow to be useful in applications such as blow molding of bottles and other hollow articles.

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