Preparation of concentrated, stable water-in-oil emulsions of wa

Details Preparation of concentrated, stable water-in-oil emulsions of wa Preparation of concentrated, stable water-in-oil emulsions of wa

1985-07-11

1987-02-24

Schofer, Joseph L.

Distillation: processes, separatory

Distilling to separate or remove only water

From organic compound

203 52, 203 68, 203 69, 203 70, 203 91, 523332, 524801, 524827, 524831, C07B 500

Patent

active

046455680

ABSTRACT:
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.

REFERENCES:
patent: 3278506 (1966-10-01), Chamot et al.
patent: 4021399 (1977-05-01), Hunter et al.
patent: 4052353 (1977-10-01), Scanley
patent: 4090992 (1978-05-01), Scanley
patent: 4105510 (1978-08-01), Tago et al.
patent: 4176107 (1979-11-01), Buckman et al.
patent: 4376850 (1983-03-01), Sanner
patent: 4435528 (1984-03-01), Domina

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