4.
    发明专利
    未知

    公开(公告)号:DE19805487A1

    公开(公告)日:1999-08-12

    申请号:DE19805487

    申请日:1998-02-11

    Applicant: BASF AG

    Abstract: The invention relates to a method for the production of 1-(2-sulphoethyl)-pyridinium betaine, whereby pyridine is reacted with a sulphoethylating reagent from a group comprising carbyl sulphate, ethionic acid or the salt thereof and vinyl sulphonic acid or vinyl sulphonate, and the reaction occurs in an aqueous solution or in pyridine.

    6.
    发明专利
    未知

    公开(公告)号:DE50210951D1

    公开(公告)日:2007-11-08

    申请号:DE50210951

    申请日:2002-04-24

    Applicant: BASF AG

    Abstract: Water soluble polymer comprising esters of acrylic acid, methacrylic acid and alkylpolyalkyene glycols, is prepared by esterification followed by radical polymerization of the resulting mixture in an aqueous medium, whereby the organic solvent is azeotropically distilled off during the polymerization and recycled to the mixture or is replaced by the addition of fresh water. A water soluble polymer (I) comprising esters of acrylic acid, methacrylic acid and alkylpolyalkyene glycols, is prepared by esterification of a mixture of acrylic acid (A), methacrylic acid (B) and an alkylpolyalkylene glycol (C) having a mol.wt. (Mw) of 350-4000 in a molar ratio of (A) to (C) of 0.1-4:1, a molar ratio of (B to (C) of 1-5:1 and molar ratio of the sum of (A) and (B) to (C) of 2-6:1, in the presence of an organic solvent that forms an azeotrope with water to at least 85 wt.% (w.r.t. (C)), followed by radical polymerization of the resulting mixture in an aqueous medium, whereby the organic solvent is azeotropically distilled off from the reaction mixture during the polymerization and the distilled water is recycled to the mixture or is replaced by the addition of fresh water.

    8.
    发明专利
    未知

    公开(公告)号:DE19610361A1

    公开(公告)日:1997-09-18

    申请号:DE19610361

    申请日:1996-03-15

    Applicant: BASF AG

    Abstract: For the galvanic deposition of semi-bright nickel plate on a substrate, the invention calls for an aqueous acid elctroplating solution which (a) contains one or more cyclic N-allyl or N-vinyl ammonium compounds, in particular N-allylpyridinium compounds, as brightener and (b) is essentially free of sulfphur which can be reduced under the electrolysis conditions used.

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