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    4.
    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.

    Polymerized hydrogel comprising low amounts of residual monomers and by-products
    8.
    发明专利
    Polymerized hydrogel comprising low amounts of residual monomers and by-products 未知

    公开(公告)号：AU2003247669A8

    公开(公告)日：2004-01-19

    申请号：AU2003247669

    申请日：2003-07-01

    Applicant: BASF AG ,  PROCTER & GAMBLE

    Inventor： WEIDL CHRISTIAN H ,  FRENZ VOLKER ,  STEPHAN OSKAR ,  MERRIGAN STEVEN RAY ,  SCHECHTMAN LEE ARNOLD ,  GOLDMAN STEPHEN ALLEN ,  BECK MARTIN ,  GOERTH FELIX

    IPC: A61L15/58 ,  A61L15/60 ,  C08F6/00 ,  A61L24/04

    Abstract: The present invention relates to a process for making polymerized hydrogel, in particular adhesives, which are characterized by very low amount of residual starting monomer(s), impurity(s) and/or by-products which could be formed during polymerization, such as acrylamide, acrylonitrile or acrolein. After a first polymerization step, which is conducted from a reaction medium comprising starting monomer(s) and at least one polyol, the resulting hydrogel is then post-treated with a compound which chemically reacts with said residual monomer(s), impurity(s) and/or with said by-products the said polymerization could produce, to thereby reduce said residual starting monomer(s), impurity(s) and/or said by-products within said hydrogel. The present invention also relates to polymerized hydrogels, in particular adhesives, comprising 10-90 wt % water, 10-60 wt % cross-linked hydrophilic polymer made from starting monomer(s) comprising acrylic acid, and 10-80 wt % of at least one polyol, such hydrogel being prepared by polymerizing said starting monomer(s) in the presence of said water and said polyol(s), wherein such hydrogels contain less than 500 ppb, preferably less than 100 ppb, more preferably less than 50 ppb and most preferably less than 20 ppb of alpha,beta-unsaturated carbonyl by-product(s) derived from said polyol(s) during polymerization, and wherein the level of residual starting monomer(s) is below 200 ppm, preferably below 100 ppm, more preferably below 50 ppm, even more preferably below 20 ppm, and most preferably below 10 ppm.

    10.
    发明专利
    未知

    公开(公告)号：AT371698T

    公开(公告)日：2007-09-15

    申请号：AT03737290

    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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