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US 5,331,070 AGranted
Process for olefin polymerization
AssigneePhillips Petroleum Company
InventorsTed M. Pettijohn, William K. Reagen, Shirley J. Martin
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Abstract
Olefins can be polymerized in the presence of a catalyst system composition comprising chromium supported on an inorganic oxide support, a pyrrole-containing compounds, and a metal alkyl. The use of this type of polymerization process can produce an olefin comonomer in-situ, resulting in polymers having decreased density and increased branching.
Claims13
A process comprising polymerizing at least one olefin in a reaction zone in the presence of:
- (a) a catalyst system composition consisting essentially of chromium oxide supported on an inorganic oxide support;
- (b) a pyrrole-containing compound;
- and
- (c) a non-hydrolyzed metal alkyl selected from the group consisting of aluminum alkyls, lithium alkyls, magnesium alkyls, zinc alkyls, and mixtures thereof.
1 more element
A process comprising polymerizing ethylene in a reaction zone in the presence of:
- (a) a catalyst system composition consisting essentially of chromium oxide supported on an inorganic oxide support;
- (b) hydrogen pyrrolide;
- (c) triethylaluminum;
- and
- (d) recovering a polymer.
2 more elements
Dependencies are inferred from the claim text.