Phillips Petroleum Company

Benny E Nasser, Jr

Joseph A Delap

John P Hogan

Richard E Dietz

A particulate catalyst support such as silica or a silica-titania cogel is impregnated with a titanium compound from a nonaqueous solution and the resulting composition heated to activation temperature and thereafter impregnated with a .pi. bonded organochromium compound. Finally the chromium-containing support is heated to reactivate same. Such catalysts are particularly suitable for polymerizing at least one mono-1-olefin containing 2 to 8 carbon atoms per molecule.

Organochromium on titanium-impregnated base as olefin polymerization

Catalyst is produced by first activating a chromium-containing silicon-containing support at calcination temperature, treating with a fluoride compound and thereafter heating at a lower temperature of 300.degree. to 1000.degree.F for about 1 to 20 hours. Catalysts thus produced are of particular utility in the production of narrow molecular weight distribution ethylene polymers.

Two stage activation of fluorided chromium-containing catalyst

Olefins are polymerized with a catalyst which forms on mixing a supported chromium oxide composite and a silane adjuvant. This system allows the production of polymer of a given melt index at a higher temperature, thus increasing the production rate and is of particular utility in solution polymerizations designed to produce ethylene polymers and copolymers.

Silane adjuvant for chromium oxide catalyst

Ethylene or ethylene plus a higher 1-olefin comonomer is polymerized in a solution system utilizing a catalyst comprising a silicon-containing support, a chromium compound, and a Group VIII metal and thereafter any excess monomer is removed and hydrogen introduced to lower the unsaturation of the polymer.

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Bartlesville, OK, United States of America

Benny E Nasser, Jr