中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

35 records (took 0.019 seconds)

    33.
    发明专利
    未知

    公开(公告)号：BR9908248A

    公开(公告)日：2000-10-31

    申请号：BR9908248

    申请日：1999-02-24

    Applicant: BASF AG

    Inventor： FUNK R DIGER ,  FRENZ VOLKER ,  RIEGEL ULRICH ,  WEISMANTEL MATTHIAS ,  ENGELHARDT FRITZ ,  DANIEL THOMAS

    IPC: C07D263/20 ,  A61L15/00 ,  A61L15/60 ,  C08F8/30 ,  C08G73/06 ,  C08J3/24

    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 formulain 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.

    34.
    发明专利
    未知

    公开(公告)号：DE19854575A1

    公开(公告)日：2000-05-31

    申请号：DE19854575

    申请日：1998-11-26

    Applicant: BASF AG

    Inventor： DANIEL THOMAS ,  RIEGEL ULRICH ,  WEISMANTEL MATTHIAS ,  HERFERT NORBERT ,  ENGELHARDT FRITZ

    IPC: A61F13/53 ,  A61F5/44 ,  A61F13/15 ,  A61F13/49 ,  A61L15/18 ,  A61L15/60 ,  C08F2/44 ,  C08F20/04 ,  C08K3/34

    Abstract: The invention relates to hydrogels capable of absorbing aqueous fluids, which hydrogels are produced by polymerization of olefinically unsaturated carboxylic acids or their derivatives. The hydrogels are characterized in that before, during or after the polymerization reaction and before drying a silicic acid alkali salt of the general formula (I) M2O x n SiO2 is added to the polymerization reaction mixture. In said formula M is an alkali metal and n is a number between 0.5 and 4. The hydrogel obtained in this way is then dried at an elevated temperature. The invention also relates to a method for producing said hydrogels and to their use for absorbing aqueous fluids.

Patent Agency Ranking