Concentrated direct dye solution

Details Concentrated direct dye solution Concentrated direct dye solution

1978-04-17

1980-10-14

Clingman, A. Lionel

Bleaching and dyeing; fluid treatment and chemical modification

Organic additive for dye composition, dye composition...

Nitrogen-containing, other than nitro or nitroso

260191, 8604, 8662, C09B 2700, D06P 102

Patent

active

042278791

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.

REFERENCES:
patent: 3681320 (1972-08-01), Franklin
patent: 3700653 (1972-10-01), Frei et al.
patent: 3829287 (1974-08-01), Litke
patent: 3852029 (1974-12-01), Bolliger et al.
patent: 3995997 (1976-12-01), Boehmke et al.
patent: 4019858 (1977-04-01), Conger
patent: 4077767 (1978-03-01), Bleck et al.
patent: 4087245 (1978-05-01), Kramer et al.

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