Water-absorbent cross-linked polymers in foam form

US6174929A · kind A · utility

Assignee

• BASF SE

Inventors

• Hans-Joachim Hähnle · Neustadt, DE
• Manfred Walter · Nuremberg, DE
• Jurgen Tropsch · Lichtenfels, DE
• Jens Kremeskotter · Ludwigshafen, DE
• Gunnar Schornick · Neuleiningen, DE
• Thomas Anstock · Bad Dürkheim, DE

Key dates

• Filing date: Aug 26, 1998
• Grant date: Jan 16, 2001
• Expiry date: Aug 26, 2018

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J9/30
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

Water-absorbing foamlike crosslinked polymers which are obtainable by PA1 (I) foaming a polymerizable aqueous mixture which consists of PA2 (a) monoethylenically unsaturated monomers containing acid groups, which are at least 50 mol % neutralized, PA2 (b) with or without other monoethylenically unsaturated monomers, PA2 (c) crosslinker, PA2 (d) initiators, PA2 (e) from 0.1 to 20% by weight of at least one surfactant, PA2 (f) with or without one or more solubilizers and PA2 (g) with or without thickeners, foam stabilizers, polymerization regulators, fillers and/or cell nucleating agents, the foaming being performed by dispersing fine bubbles of a gas inert to free radicals, and PA1 (II) polymerizing the foamed mixture with formation of a foamed hydrogel, with or without adjusting the water content of the foamed polymer to from 1 to 60% by weight, processes for their preparation and their use in sanitary articles which are used for absorbing body fluids and in dressing materials for covering wounds are described.