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96 records (took 0.047 seconds)

    64.
    发明专利
    未知

    公开(公告)号：MX225754B

    公开(公告)日：2005-01-24

    申请号：MXPA01005256

    申请日：2001-05-25

    Applicant: BASF AG

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

    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×nSiO2 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.

    New (meth)acrylate ester-based polyunsaturated compound mixtures, useful as crosslinkers for preparing new, hydrolysis-resistant, water-absorbing crosslinked hydrogels
    65.
    发明专利
    New (meth)acrylate ester-based polyunsaturated compound mixtures, useful as crosslinkers for preparing new, hydrolysis-resistant, water-absorbing crosslinked hydrogels 未知

    公开(公告)号：DE10358369A1

    公开(公告)日：2004-12-23

    申请号：DE10358369

    申请日：2003-12-11

    Applicant: BASF AG

    Inventor： RIEGEL ULRICH ,  DANIEL THOMAS ,  WEISMANTEL MATTHIAS ,  ELLIOTT MARK ,  FUNK RUEDIGER ,  SCHWALM REINHOLD

    IPC: C08G65/26 ,  C08G65/332 ,  A61L15/26 ,  B65D65/38 ,  C04B24/32 ,  C09D171/02

    Abstract: New mixtures (F i) of at least two (preferably 2-4) compounds (I), each having at least two double bonds and where at least two of (I) have at least two (meth)acrylate ester groups as double bond components, have a weight-functionality ratio (WFR) value (defined as the sum of the (molar fraction times molecular weight divided by number of double bonds) values for all the components (I)) of 200-600 (preferably 250-350) g per mole double bond. Independent claims are included for: (a) the preparation of (F i); (b) the production of a crosslinked hydrogel (CHG), by polymerizing the mixture (F i) with (meth)acrylic acid, optionally other monoethylenically unsaturated monomers (N) and optionally further copolymerizable hydrophilic comonomer(s) (M) in presence of radical initiator(s) (K) and optionally graft substrate(s) (L), then optionally post-crosslinking, drying and optionally milling and/or screening; (c) polymers obtained by the above CHG production method; (d) CHG's, containing at least one M in polymerized form and crosslinked with (F i); (e) mixtures comprising (by weight) 0.1-40% (F i) and (meth0acrylic acid, 0.5-99.9% (M), 0-10% esterification catalyst(s) (C), 0-5% polymerization inhibitor(s) (D), 0-10% solvent (E) and optionally diluents (G) to 100%; (f) CHG's obtained from the mixtures, followed by optionally post-crosslinking, drying and optionally milling and/or screening.

    67.
    发明专利
    未知

    公开(公告)号：DE59909423D1

    公开(公告)日：2004-06-09

    申请号：DE59909423

    申请日：1999-11-18

    Applicant: BASF AG

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

    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×nSiO2 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.

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