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AssigneeBASF SE
InventorsArmin Kurps, Hermann Fischer, Jurgen Hartmann, Heinrich Hartmann
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Concentrated, stable water-in-oil emulsions of water-soluble or water-swellable polymers are prepared by polymerization of one or more water-soluble ethylenically unsaturated monomers in a water-in-oil emulsion and removal of water from the water-in-oil polymer emulsion by azeotropic distillation, by a method in which superheated vapor of an inert organic solvent which is immiscible with water is passed into the water-in-oil polymer emulsion. Using the process, it is also possible to concentrate emulsions which tend to coagulate or water-in-oil emulsions which are sensitive to shearing, without the polymers losing their effectiveness.
A process for the preparation of a concentrated, stable water-in-oil emulsion of a water-soluble or water-swellable polymer by polymerization of one or more water-soluble ethylenically unsaturated monomers in a water-in-oil emulsion and removal of water from the water-in-oil polymer emulsion by azeotropic distillation, wherein the water is removed azeotropically from the water-in-oil polymer emulsion by passing in superheated vapor of an inert organic solvent which is immiscible with water.
Dependencies are inferred from the claim text.