Method for cross-linking hydrogels with bis- and poly-2-oxazolidinones

US6503979B1 · kind B1 · utility

Assignee

• BASF SE

Inventors

• Rüdiger Funk · Niedernhausen, DE
• Volker Frenz · Hochheim, DE
• Ulrich Riegel · Landstuhl, DE
• Matthias Weismantel · Bad Orb, DE
• Fritz Engelhardt · Frankfurt am Main, DE
• Thomas Daniel · Waldsee, DE

Key dates

• Filing date: Aug 28, 2000
• Grant date: Jan 7, 2003
• Expiry date: Aug 28, 2020

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S524/916
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention contains a process for the surface postcrosslinking of water-absorbing polymers in which the polymers are treated with a surface postcrosslinking solution and during or after the treatment are postcrosslinked by means of an increase in temperature and are dried, wherein the crossiinker comprises a bis-2-oxazolidinone or a poly-2-oxazolidinone comprising structural units of the formula in which R1 is branched or unbranched C1-C18-alkylene, branched or unbranched C2-C18-alkenylene, C5-C18-cycloalkylene, phenylene, naphthylene, anthracenylene, hydrocarbon-substituted phenylene, naphthylene or anthracenylene or another substituted or unsubstituted C6-C18-arylene radical, R2 is branched or unbranched C1-C18-alkylene and n is an integer from 1 to 50 or a mixture of bis-2-oxazolidinones and poly-2-oxazolidinones dissolved in an inert solvent.