Polymerization catalyst systems, methods of making and uses therefor
AssigneePhillips Petroleum Company
InventorsJoseph S. Shveima, Max P. McDaniel, Shirley J. Martin, Kathy S. Collins, Elizabeth A. Benham, Anthony P. Eaton, Ashish M. Sukhadia
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Abstract
A novel magnesium treated silica-containing compound that is useful as a support for chromium based olefin polymerization catalyst systems is provided which produces ethylene polymers having with MWD's that promote good properties particularly in HMW film applications.
Claims13
A process to prepare a treated silica-containing composition comprising:
- a) contacting a silica-containing inorganic oxide with a magnesium-containing compound;
- and
- b) converting said magnesium-containing compound to a magnesium oxide.
A polymerization process comprising contacting in a reaction zone, at a temperature within a range of about 185° F. to about 230° F. in the presence of a hydrocarbon diluent:
- a) ethylene monomer;
- b) a catalyst system comprising chromium supported on a magnesium treated silica-containing compound;
- and
- c) an aluminum alkyl cocatalyst;
- and recovering a polymer of ethylene.
Dependencies are inferred from the claim text.