Patent · US Expired

Hydrophilic, swellable graft copolymers, their preparation and use

US5041496A · kind A · utility

23Cited by

2References

17Claims

0Family size

Assignee

Cassella Aktiengesellschaft · DE

Inventors

Friedrich Engelhardt · Frankfurt, DE
Ulrich Riegel · Landstuhl, DE
Jurgen Kuhlwein · Heusenstamm, DE

Key dates

Filing date	Mar 19, 1990
Grant date	Aug 20, 1991
Priority date	—
Expiry date	Mar 19, 2010

Classification

Technology area (CPC A)Human Necessities
CPC primaryA61L15/60
WIPO fieldMedical technology
WIPO sectorInstruments

Abstract

The present invention relates to hydrophilic, swellable graft copolymers composed, in random distribution, of 0.5 to 20% by weight of radicals of the general formula I ##STR1## of 79 to 99% by weight of radicals containing an acidic group, of the general formula II ##STR2## and of 0.1 to 2% by weight of radicals of a crosslinking agent which are derived from monomers having at least two olefinically unsaturated double bonds, and the radicals X, Z, m, n, z and also R.sup.1 to R.sup.4 are defined as given in the description, a process for the preparation of these graft copolymers and also their use as absorbents for water and aqueous solutions.

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