Patents Assigned to Cassella AG.
  • Formulation for brightening synthetic fibers and its preparation and use
    Patent number: 4304569
    Abstract: The formulation for brightening synthetic fibers or mixtures of synthetic fibers and natural fibers, which is an aqueous dispersion comprising at least one finely divided optical brightener and a dispersing agent, wherein the improvement comprises the dispersing agent being a water-soluble or water-dispersible polyester containing at least one phosphonic acid ester moiety.
    Type: Grant
    Filed: November 26, 1980
    Date of Patent: December 8, 1981
    Assignee: Cassella AG.
    Inventors: Friedrich Engelhardt, Karl Hintermeier, Herbert Friedrich, Thomas Martini