Patent · US Expired

Preparation of concentrated, stable water-in-oil emulsions of water-soluble or water-swellable polymers

US4645568A · kind A · utility

45Cited by

8References

8Claims

0Family size

Assignee

BASF SE

Inventors

Armin Kurps · Haßloch, DE
Hermann Fischer · Augsburg, DE
Jürgen Hartmann · Wesel, DE
Heinrich Hartmann · Schifferstadt, DE

Key dates

Filing date	Jul 11, 1985
Grant date	Feb 24, 1987
Priority date	—
Expiry date	Jul 11, 2005

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08J2300/14
WIPO fieldChemical engineering
WIPO sectorChemistry

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.