Chromium-containing catalysts for polymerizing olefins
AssigneeThe Dow Chemical Company
InventorsFred L. Vance, Jr., Rafael E. Guerra, Christopher P. Christenson
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Abstract
Inorganic oxide supported chromium-containing catalysts are improved by depositing the chromium onto the inorganic oxide support in the vapor phase rather than as an inorganic or organic compound. Polymers resulting from polymerizing one or more .alpha.-olefins in the presence of such catalysts exhibit a higher molecular weight as compared to those polymers prepared in the presence of such chromium-containing catalysts prepared in the conventional manner.
Claims6
In an inorganic oxide supported chromium-containing catalyst wherein said catalyst has been prepared by contacting said inorganic oxide support with zero valent chromium in the vapor state followed by activation in an oxidizing atmosphere at an elevated temperature for a time sufficient to activate the catalyst.
Dependencies are inferred from the claim text.