13.
    发明专利
    未知

    公开(公告)号:BR0316796A

    公开(公告)日:2005-11-01

    申请号:BR0316796

    申请日:2003-12-03

    Applicant: BASF AG

    Abstract: A process for the reduction of the concentration of methoxyhydroquinone (MEHQ) in acrylic acid that is neutralized to 75-100% comprises continuous adsorption on activated carbon. An Independent claim is included for a process for the production of superabsorbers (I) by reduction of the MEHQ content by the novel process followed by polymerization, optionally with non-neutralized acrylic acid with optionally surface cross-linking.

    15.
    发明专利
    未知

    公开(公告)号:DE50308186D1

    公开(公告)日:2007-10-25

    申请号:DE50308186

    申请日:2003-07-18

    Applicant: BASF AG

    Abstract: A process for producing sodium acrylate polymers by free-radical polymerization of sodium acrylate with or without other monomers in an aqueous medium, which comprises using sodium acrylate in the form of an aqueous solution or dispersion obtainable by dissolving or dispersing solid sodium acrylate in an aqueous medium. The polymers thus obtainable have an improved color number and a lower residual monomer content than conventional comparable polymers.

    17.
    发明专利
    未知

    公开(公告)号:DE102004038015A1

    公开(公告)日:2006-03-16

    申请号:DE102004038015

    申请日:2004-08-04

    Applicant: BASF AG

    Abstract: Disclosed is a process for postcrosslinking a water absorbing polymer by the polymer being treated with at least one postcrosslinker and postcrosslinked and dried during or after the treatment by raising the temperature, the at least one postcrosslinker being a cyclic carbamate or a cyclic urea, wherein the cyclic carbamate or the cyclic urea was obtained by reacting respectively an aminoalcohol or a diamine with a cyclic carbonate.

    18.
    发明专利
    未知

    公开(公告)号:BR0312831A

    公开(公告)日:2005-04-26

    申请号:BR0312831

    申请日:2003-07-18

    Applicant: BASF AG

    Abstract: A process for producing sodium acrylate polymers by free-radical polymerization of sodium acrylate with or without other monomers in an aqueous medium, which comprises using sodium acrylate in the form of an aqueous solution or dispersion obtainable by dissolving or dispersing solid sodium acrylate in an aqueous medium. The polymers thus obtainable have an improved color number and a lower residual monomer content than conventional comparable polymers.

    19.
    发明专利
    未知

    公开(公告)号:AT373022T

    公开(公告)日:2007-09-15

    申请号:AT03766231

    申请日:2003-07-18

    Applicant: BASF AG

    Abstract: A process for producing sodium acrylate polymers by free-radical polymerization of sodium acrylate with or without other monomers in an aqueous medium, which comprises using sodium acrylate in the form of an aqueous solution or dispersion obtainable by dissolving or dispersing solid sodium acrylate in an aqueous medium. The polymers thus obtainable have an improved color number and a lower residual monomer content than conventional comparable polymers.

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