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    26.
    发明专利
    未知

    公开(公告)号：DE19607551A1

    公开(公告)日：1997-09-04

    申请号：DE19607551

    申请日：1996-02-28

    Applicant: BASF AG

    Inventor： HAEHNLE HANS-JOACHIM ,  WALTER MANFRED ,  TROPSCH JUERGEN ,  KREMESKOETTER JENS ,  SCHORNICK GUNNAR ,  ANSTOCK THOMAS

    IPC: A61F13/00 ,  A61F13/53 ,  A61L15/00 ,  A61L15/16 ,  A61L15/42 ,  A61L15/60 ,  C05G3/80 ,  C08F2/44 ,  C08F2/48 ,  C08F220/06 ,  C08J9/30 ,  C08L33/02 ,  C08F20/04 ,  C05F3/04 ,  B65D65/38 ,  C08J9/16

    Abstract: 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.

    29.
    发明专利
    未知

    公开(公告)号：DE50308061D1

    公开(公告)日：2007-10-11

    申请号：DE50308061

    申请日：2003-01-30

    Applicant: BASF AG

    Inventor： CHAMP SAMANTHA ,  HAEHNLE HANS-JOACHIM ,  BECK MARTIN ,  FUNK RUEDIGER

    IPC: A61F13/53 ,  C08J9/30 ,  A61F13/00 ,  A61F13/15 ,  A61F13/49 ,  A61L15/00 ,  C08J9/12 ,  C08J9/28 ,  C08K3/00 ,  C08K5/00 ,  C08L101/14

    Abstract: Foams composed of water-absorbing basic polymers, obtainable by (I) foaming a crosslinkable aqueous mixture including (a) at least one basic polymer whose basic groups have optionally been neutralized, (b) at least one crosslinker, (c) at least one surfactant, (d) optionally at least one solubilizer, (e) optionally thickeners, foam stabilizers, fillers, fibers and/or cell nucleators, and (f) optionally particulate water-absorbing acidic polymers, by dissolving a gas which is inert toward free radicals in the crosslinkable aqueous mixture under a pressure from 2 to 400 bar and subsequently decompressing the crosslinkable aqueous mixture to atmospheric or by dispersing fine bubbles of a gas which is inert toward free radicals, and (II) crosslinking the foamed mixture to form a hydrogel foam and if applicable adjusting the water content of the polymer foam to 1-60% by weight. Preparation of the foams by application of the abovementioned measures (I) and (II) and use of the thus obtainable foams in hygiene articles to absorb body fluids, in dressing material to cover wounds, as a sealing material, as a packaging material, as a soil improver, as a soil substitute, to dewater sludges, to absorb aqueous acidic wastes, to thicken waterborne paints or coatings in the course of disposing of residual quantities thereof, to dewater water-containing oils or hydrocarbons or as a material for filters in ventilation systems.

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