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US 4,289,679 AGranted
Method for producing solutions of drag reducing substances
AssigneeConoco Inc.
InventorMark P. Mack
Life of this patent
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Abstract
A method of producing ultra-high molecular weight polymers useful as drag reducing substances or antimist agents comprising; (1) polymerizing an alpha-olefin or olefins from 2 to 30 carbon atoms with a Ziegler catalyst in a light hydrocarbon solvent; (2) adding a heavy hydrocarbon diluent or a non-solvent suspending agent to the resulting polymer or copolymer mixture, and (3) removing substantially all of the light hydrocarbon component.
Claims5
An improved method for producing solution of ultrahigh molecular weight polymers, which polymers are useful as drag reducing substances or anti-mist agents, comprising
- (1) polymerizing an alpha olefin or mixtures of alpha olefins containing from 2 to 30 carbon atoms in the presence of a Ziegler/Natta catalyst system to at least 5% of the monomer present in a polymerization grade hydrocarbon diluent;
- (2) adding the polymerization mixture obtained to a relatively heavy hydrocarbon diluent having a boiling point difference from the polymerization mixture sufficient to allow separation;
- and
- (3) removing substantially all polymerization grade hydrocarbon components, leaving the polymr dissolved in the heavy hydrocarbon diluent.
1 more element
Dependencies are inferred from the claim text.