Silane adjuvant for chromium oxide catalyst
AssigneePhillips Petroleum Company
InventorsJohn P. Hogan, Benny E. Nasser, Joseph A. Delap
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Abstract
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.
Claims10
A polymerization process which comprises contacting at least one mono-1-olefin having 2 to 8 carbon atoms per molecule in the presence of a liquid solvent with a catalyst system comprising (1) a calcined support containing chromium in the form of chromium oxide at least a part of said chromium being in the hexavalent state and (2) a silane of the formula R.sub.4.sub.-n SiH.sub.n wherein n is an integer from 0 to 3 and R is a saturated or unsaturated hydrocarbon group containing from 1 to 10 carbon atoms per molecule selected from alkyl, alkenyl, aryl, aralkyl, alkaryl, and cycloalkyl groups.
Dependencies are inferred from the claim text.