Patent · US Expired

Process for the continuous production of superabsorbent polymers from pan emulsions

US5728774A · kind A · utility

5Cited by

3References

8Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Gunter Sackmann · Leverkusen, DE
Sergej Schapowalow · Neunburg vorm Wald, DE
Martin Ullrich · Leverkusen, DE
Helmut Brod · Cologne, DE

Key dates

Filing date	Dec 20, 1996
Grant date	Mar 17, 1998
Priority date	—
Expiry date	Dec 20, 2016

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08F2810/20
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A process for the continuous production of superabsorbent polymers, characterised in that aqueous emulsions of uncross-linked and cross-linked polyacrylonitrile homopolymers and/or copolymers, the polyacrylonitrile concentrations in the reaction mixture being from 10 to 45 w.t. %, are hydrolysed with aqueous alkali hydroxide solutions at 50.degree. to 100.degree. C. in a continuously operating reactor suitable for carrying out highly viscous reactions, and that from the highly viscous gels formed the products in the form of superabsorbent powders are continuously precipitated by means of continuous precipitation using low-boiling monoalcohols, and the use thereof in sanitary articles, as water-storing materials in agriculture or for sheathing electrical cables.

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