Hydrophilic swellable graft copolymers, their preparation and use

US5011892A · kind A · utility

Assignee

• Cassella Aktiengesellschaft · DE

Inventors

• Friedrich Engelhardt · Frankfurt, DE
• Ulrich Riegel · Landstuhl, DE

Key dates

• Filing date: Mar 26, 1990
• Grant date: Apr 30, 1991
• Expiry date: Mar 26, 2010

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61L15/60
• WIPO field: Medical technology
• WIPO sector: Instruments

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## 79 to 99% by weight of radicals containing an acidic group, of the general formula II ##STR2## and 0.1 to 2% by weight of crosslinking structures which are derived from monomers having at least two olefinically unsaturated double bonds, where the radicals X, Y, R.sup.1 to R.sup.4 and n have the meanings given in claim 1, and which are used as absorbents for water and aqueous solutions.