Amino Alkanol Patents (Class 8/604)
  • Patent number: 4227879
    Abstract: Concentrated solutions of a direct dye having, in the free acid form the formula: ##STR1## are described. The solutions contain 10-30% (by weight) of the dye, 5-20% of one or more specifically defined bases; 0-5% of alkali metal cations; and 45-85% water and have a lower viscosity and solvent to dye ratio than solutions of the dye of similar strength prepared according to prior art methods. The solutions are prepared by isolating the diazonium salt of p- (p-aminophenyl)azo benzenesulfonic acid then coupling the diazo into J-Acid.
    Type: Grant
    Filed: April 17, 1978
    Date of Patent: October 14, 1980
    Assignee: American Color & Chemical Corporation
    Inventor: Allan M. Huffman