Patents Examined by Isabele Rodriguez
  • Dye mixtures
    Patent number: 4731094
    Abstract: Mixtures comprising 75 to 99% by weight of a dye of formula ##STR1## wherein X is hydrogen, chlorine, bromine or methyl, andKK is the radical of a coupling component that does not contain water solubilizing groups,and 1 to 25% by weight of a dye of formula ##STR2## wherein X and KK have the given meanings and Y is chlorine or bromine, are suitable for dyeing polyester materials.
    Type: Grant
    Filed: April 1, 1987
    Date of Patent: March 15, 1988
    Assignee: Ciba-Geigy Corporation
    Inventors: Helga Kaiser, Hans-Jorg Angliker, Peter E. Eugster