摘要 |
The invention concerns water-absorbent cross-linked polymers in foam form which are obtained by: (I) foaming a polymerizable aqueous mixture which comprises: (a) monoethylenically unsaturated monomers which contain acid groups and are neutralized to at least 50 mol %; (b) optionally other monoethylenically unsaturated monomers; (c) cross-linking agents; (d) initiators; (e) between 0.1 and 20 wt % of at least one surfactant; (f) optionally at least one solubilizer; and (g) optionally thickening agents, foam stabilizers, polymerization regulators, fillers and/or cell nucleating agents; foaming occurring by dispersing fine bubbles of a gas which is inert with respect to radicals; and (II) polymerizing the foamed mixture, forming a foam-form hydrogel and optionally adjusting the water content of the foam-form polymer to between 1 and 60 wt %. The invention further concerns a process for preparing these polymers and their use in sanitary articles which are used to absorb body fluids, and in bandaging material for covering wounds.
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申请人 |
BASF AG, 67063 LUDWIGSHAFEN, DE |
发明人 |
HAEHNLE, HANS-JOACHIM, DR., 67069 LUDWIGSHAFEN, DE;WALTER, MANFRED, DR., 67346 SPEYER, DE;TROPSCH, JUERGEN, DR., 67354 ROEMERBERG, DE;KREMESKOETTER, JENS, DR., 67063 LUDWIGSHAFEN, DE;SCHORNICK, GUNNAR, DR., 67271 NEULEININGEN, DE;ANSTOCK, THOMAS, DR., 67256 WEISENHEIM, DE |