Patents Represented by Attorney Dederico van Eyl

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  • Pigment preparations
    Patent number: 6881255
    Abstract: Pigment preparations comprising a) at least one pigment, b) at least one polyethyleneimine which is alkoxylated, especially ethoxylated and propoxylated and/or butoxylated, and c) at least one condensation product based on A) sulphonated aromatics, B) aldehydes and/or ketones and optionally C) one or more compounds selected from the group consisting of nonsulphonated aromatics, urea and urea derivatives.
    Type: Grant
    Filed: March 3, 2004
    Date of Patent: April 19, 2005
    Assignee: Bayer Chemicals AG
    Inventors: Udo Herrmann, Dirk Pfützenreuter, Josef Witt, Hans-Jürgen Hartrumpf