Direct blue dyes from the condensation of diaminostilbenedisulfo

Details Direct blue dyes from the condensation of diaminostilbenedisulfo Direct blue dyes from the condensation of diaminostilbenedisulfo

1980-05-30

1982-02-09

Clingman, A. Lionel

Bleaching and dyeing; fluid treatment and chemical modification

Dye concentrate composition wherein an additional amount of...

260177, 260178, 260182, D06P 6700

Patent

active

043148166

ABSTRACT:
A new dye based upon N-alkylated or N-hydroxyalkylated 8-amino-1-naphthol-3,6-disulfonic acid and 4,4'-diaminostilbene-2,2'-disulfonic acid, a procedure for synthesizing it and a procedure for utilizing it for coloring cellulosic substrates is disclosed. The naphthol compound is alkylated or hydroxyalkylated and coupled with the isolated tetrazonium salt of the diamine, and in a preferable embodiment sufficient of the sulfonic acid groups are neutralized to render the final dye water soluble. The procedure is preferably conducted in aqueous medium, and the substitution of the amino group of the naphthol compound is preferably effected with lower dialkyl sulfates or epoxides. The dye is particularly suitable for dyeing paper.

REFERENCES:
patent: 2211752 (1940-08-01), Kappeler
patent: 2489463 (1949-11-01), Reynolds
patent: 4118182 (1978-10-01), Smith

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