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    34.
    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.

    35.
    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.

    36.
    发明专利
    未知

    公开(公告)号：BRPI0608923A2

    公开(公告)日：2010-11-03

    申请号：BRPI0608923

    申请日：2006-03-23

    Applicant: BASF AG

    Inventor： WEISMANTEL MATTHIAS ,  BRUHNS STEFAN ,  VAN ESBROECK DOMINICUS

    IPC: C08F2/04 ,  A61L15/12 ,  C08F6/10 ,  C08F20/06 ,  C08J3/075 ,  F26B17/00

    Abstract: Preparation of water-absorbing polymers (A) with drying quality index comprises polymerizing a monomer solution and drying the obtained hydrogel agent in hot-gas flow, where the drying process takes place in at least two temperature zones, when the flow of the hydrogel in the gas flow is: downwards in the front side of the volume drier, and upwards against the rear side of the drier; where the amount of water in the hydrogel is 15-45 wt.%, the hydrogel layer in the volume drier flows at least partially against down wards, and the speed of the gas is 5-30%. Preparation of water-absorbing polymers (A) with drying quality index comprises polymerizing a monomer solution and drying the obtained hydrogel agent in hot-gas flow, where the drying process takes place in at least two temperature zones, when the gas inlet temperature (T n) is not equal to T n + a; and flow of the hydrogel in the gas flow is: downwards in the front side of the volume drier, and upwards against the rear side of the drier; where the amount of water in the hydrogel is 15-45 wt.%, the hydrogel layer in the volume drier flows at least partially against down wards, and the speed of the gas is 5-30%. n : index; and a : greater than 0. An independent claim is included for a device for drying (A) comprising a gas permeable conveyer belt (which is streamed by a preheated gas), where the gas inlet temperature is adjusted such that it can come form at least two temperature zones.

    38.
    发明专利
    未知

    公开(公告)号：DE102005042606A1

    公开(公告)日：2007-03-08

    申请号：DE102005042606

    申请日：2005-09-07

    Applicant: BASF AG

    Inventor： MARCO MICHAEL DE ,  WEISMANTEL MATTHIAS ,  POSSMIERS KARL J ,  MEES FILIP ,  KAEY RONNY DE

    IPC: C07C51/41 ,  B01F5/10

    Abstract: The invention relates to a neutralization process in which at least one ethylenically unsaturated carboxylic acid is preneutralized at least partly with a base, wherein the preneutralized solution is divided into at least two part-solutions and at least one part-solution is aftertreated so as to form part-solutions with different degree of neutralization and/or solids content, and also to an apparatus for carrying out the process.

    39.
    发明专利
    未知

    公开(公告)号：DE102005042605A1

    公开(公告)日：2007-03-08

    申请号：DE102005042605

    申请日：2005-09-07

    Applicant: BASF AG

    Inventor： WEISMANTEL MATTHIAS ,  CLAESSENS LOUIS ,  POSSEMIERS KARL J ,  KAEY RONNY DE

    IPC: C07C51/41 ,  B01F5/10

    Abstract: The invention relates to a neutralization process in which at least one ethylenically unsaturated carboxylic acid is neutralized at least partly with a base and at least one stream of the neutralization is determined continuously, and also to an apparatus for carrying out the process.

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