Supported chromium oxide catalyst having mixed adjuvant
AssigneePhillips Petroleum Company
InventorDonald R. Witt
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Abstract
Olefin polymers are made using a supported chromium oxide catalyst which is treated with a mixture of an organoboron compound and a hydrocarbyl aluminum hydrocarbyl oxide. This catalyst is capable of producing high shear response polymer and is of particular utility in the production of such polymer in a particle-form process.
Claims18
A process for producing a catalyst comprising:
- activating a supported chromium oxide at a temperature within the range of 500.degree.-2,000.degree.F;
- thereafter treating said thus-activated supported chromium oxide with from 0.5 to 10 weight percent, based on the weight of said supported chromium oxide, of a hydrocarbyl aluminum hydrocarbyloxide and from 0.5 to 10 weight percent, based on the weight of said supported chromium oxide of an organoboron compound.
A process which comprises contacting, in a liquid diluent at a temperature such that at least a substantial part of the polymer produced is insoluble in said diluent, at least one polymerizable olefin under polymerization conditions with a catalyst which catalyst is produced by activating a supported chromium oxide at a temperature within the range of 500.degree.-2,000.degree.F, thereafter treating said thus-activated supported chromium oxide with from 0.05 to 10 weight percent based on the weight of said supported chromium oxide of a hydrocarbyl aluminum hydrocarbyloxide and from 0.5 to 10 weight percent based on the weight of said supported chromium oxide of an organoboron compound.
Dependencies are inferred from the claim text.