Method for the preparation of non-crystalline polymers of high molecular weight
AssigneeConoco Inc.
InventorsMark P. Mack, Lewis B. Decker, Jr., Adrian L. Wallace
Life of this patent
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Abstract
A process for the preparation of a drag reducing substance which comprises: (a) a transition metal catalyst slurry containing: 1. crystalline titanium halide having the general formula TiXn where n=2.5 to 3.0 and X is halogen, 2. a hydrocarbon diluent, and 3. an ether; (b) a co-catalyst; (c) alpha-monoolefinic hydrocarbons containing from 2 to 30 carbon atoms under suitable polymerization conditions providing for an ultrahigh molecular weight polymer that is soluble in hydrocarbons; and (d) ceasing the polymerization at a polymer content of 20 percent by weight or less.
Claims9
A method for preparing non-crystalline, high molecular weight drag-reducing polymers comprising;
- (a) a transition metal catalyst slurry containing
- (1) at least 5% by weight, based on the total slurry of a crystalline titanium halide catalyst having the general formula TiX.sub.n where n=2.5 to 3.0, and X is halogen,
- (2) a hydrocarbon inert diluent, and
- (3) from 0.01 to about 10.0 moles of an ether per mole of titanium together with,
- (b) a co-catalyst wherein (a) and (b) are placed in contact with
- (c) one or more .alpha.-monoolefinic hydrocarbons containing from 2 to 30 carbon atoms at temperatures of from about -25.degree. to about 100.degree. C. and pressures of from about atmospheric to about 1000 psig to obtain an ultrahigh molecular weight polymer which is soluble in a hydrocarbon diluent, wherein
- (d) polymerization is ceased at a polymer content of 20% by weight or less based on total reactor content.
Dependencies are inferred from the claim text.