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US 4,052,353 AGranted
Dispersions of water soluble polymers in oil
OwnerClyde S. Scanleyinventor
Life of this patent
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Abstract
Water soluble polymers dispersed in a water-in-oil emulsion are treated to reduce the water content thereof to provide a polymer dispersed in oil which is stable to coagulation or agglomeration during subsequent treatment. The composition can be chemically modified and/or made self dissolving in water by addition of surfactant without polymer agglomeration.
Claims8
A self water dissolving composition of a water soluble polymer dispersed in oil which is stable to polymer coagulation and agglomeration, comprising:
- a water soluble polymer dispersed in oil, said polymer having a water content at which the polymer remains finely divided and dispersed in the oil, said water content being less than 40%, by weight, based on polymer and water, said water soluble polymer dispersed in oil having been prepared from a water in oil emulsion of said water soluble polymer by reduction of the water content thereof;
- and
- a water soluble surfactant, having an HLB number of above 8 in an amount effective to render the water soluble polymer self dissolving in water.
Dependencies are inferred from the claim text.