Olefin polymerization catalysts and preparation method
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United States of America Patent
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Dec 17, 1991
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N/A
app pub date -
May 7, 1990
filing date -
May 7, 1990
priority date (Note) -
Expired
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Abstract
Sodium-free olefin polymerization catalysts having high polymerization activities and methods of preparing such catalysts are provided. A hydrolyzable silicate ester and a hydrolyzable acid-generating chromium compound are combined with water and an organic solvent whereby a hydrolysis reaction solution is formed comprising silica and chromium. Sufficient acid-neutralizing gelling agent is added to the solution to form a gelled silica-chromium catalyst and the catalyst is aged to stabilize its structure. Water and solvent are removed from the catalyst and the catalyst is activated.
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