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US 4,053,436 AGranted
Spray dried titanium-containing catalyst for stress crack resistant polymer
AssigneePhillips Petroleum Company
InventorsJohn P. Hogan, Donald D. Norwood
Life of this patent
Estimating the term…
Abstract
A chromium-containing catalyst utilizing spray dried silica gel containing titanium is used to produce olefin polymers exhibiting an outstanding resistance to environmental stress cracking.
Claims7
A catalyst produced by a process comprising forming a hydrogel by contacting an alkali metal silicate with a material selected from the group consisting of acids, acidic salts, and carbon dioxide, said hydrogel having coprecipitated therewith a titanium compound;
- spray drying said thus-formed hydrogel to form a xerogel;
- thereafter calcining said xerogel to form said catalyst, said catalyst containing in addition 0.1 to 20 wt. % chromium calculated as CrO.sub.3 based on the total weight of said catalyst.
Dependencies are inferred from the claim text.