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    3.
    发明专利
    未知

    公开(公告)号：DE1226992B

    公开(公告)日：1966-10-20

    申请号：DEB0069932

    申请日：1962-12-11

    Applicant: BASF AG

    Inventor： POSCHMANN DR FRANZ ,  JANSON DR ALFONS

    IPC: C01B17/66 ,  D06L4/30 ,  D06P1/22

    Abstract: A mixture containing a major proportion of one or more dithionites is stabilized by a minor amount of a dry, powdered, readily water-soluble synthetic polymer having a K value between 20 and 280, preferably between 40 and 50, which is not capable of reacting chemically with the dithionites under the conditions of storage and transportation. The dithionites may be those of sodium and other alkali metals, or of zinc, or ammonium dithionite. Polymers which may be used, in amount, say, 1 to 5%, include homo- and co-polymers of (meth)acrylic acid, (meth)acrylamide, vinyl alcohol, ethylenimine, vinylpyrrolidone and acetals, and polymers of diethylaminomethylene (meth)acrylamide. The mixture may also contain carbonates, sulphates and polyphosphates.

    4.
    发明专利
    未知

    公开(公告)号：DE942553C

    公开(公告)日：1956-05-03

    申请号：DEB0030090

    申请日：1954-03-11

    Applicant: BASF AG

    Inventor： JANSON DR ALFONS

    IPC: D21C3/22

    5.
    发明专利
    未知

    公开(公告)号：DE1220399B

    公开(公告)日：1966-07-07

    申请号：DEB0070119

    申请日：1962-12-22

    Applicant: BASF AG

    Inventor： JANSON DR ALFONS ,  POSCHMANN DR FRANZ

    IPC: C01B17/66

    Abstract: Urea is present as a stabilizer in a mixture containing a major proportion of a dithionite. The amount of urea is, say, 2 to 20%.ALSO:A mixture contains a major proportion of a dithionite and urea as a stabilizer, in amount, say, 2 to 20%. Na2S2O4 is stabilized in the examples and K2S2O4 is also specified.

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