Patents Assigned to Pystar Textilfarben GmbH & Co. KG
  • Dyestuff mixtures of fiber-reactive azo dyestuffs and their use for dyeing fiber material containing hydroxyl and/or carboxamide groups
    Patent number: 5780602
    Abstract: Mixtures of fiber-reactive azo dyestuffs with which black dyeings, including prints, are obtained on fiber materials containing hydroxy and/or carboxamide groups, such as cellulosic fiber materials, wool and synthetic polyamide fibers, are described. These dyestuffs mixtures comprise one or more dyestuffs of the following formulae (1) and (2): ##STR1## in which the substituents have the meaning given in the specification.
    Type: Grant
    Filed: September 5, 1997
    Date of Patent: July 14, 1998
    Assignee: Pystar Textilfarben GmbH & Co. KG
    Inventors: Christian Schumacher, Werner Hubert Russ