Chevron Chemical Company LLC

Chevron Phillips Chemical Company LP

Pamela R Auburn

Theresa A Pecoraro

Ignatius Y Chan

Darryl K Whaley

David L Beach

Silica powders and mixed silica-oxide powders and methods of preparing such powders for use as catalyst supports for polymerization processes.

Powders of silica-oxide and mixed silica-oxide and method of preparing same

Novel catalysts are provided for the polymerization of olefins such as ethylene. These catalysts comprise a novel amorphous aluminophosphate comprising, on a microlevel, sheets of aluminophosphate as well as spheres of aluminophosphate plus a chromium compound. These new catalysts are surprisingly active; result in more co-monomer incorporation than prior art catalysts and reduce the amount of low molecular weight material in the product.

Process for the polymerization of alpha olefins using a new

An amorphous aluminophosphate composition is provided which exhibits a microstructure of sheets and spheres of silica-modified aluminophosphate. Also provided is a method for preparing the composition comprising mixing an aqueous solution containing aluminum ions, phosphate ions and silica ions, with a neutralizing solution, wherein the mixing is conducted with sufficient shear to produce on a microlevel, sheets of silica-modified aluminophosphate and spheres of silica-modified aluminophosphate. A polymerization catalyst and a polymerization process are also provided.

Silica-modified aluminophosphate compositions, catalysts, method of

Powders of silica-oxide and mixed silica-oxide and method of preparing

A method of controlling the molecular weight distribution of a polyalpha-olefin during polymerization, comprising changing the aluminoxane to chromium ratio of a polymerization catalyst comprising chromium and at least one aluminoxane to thereby adjust the molecular weight distribution.

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Kingwood, TX, United States of America

Pamela R Auburn