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US 4,052,380 AGranted
Trisazo dyes containing two different aminonaphtholsulphonic acid coupler components
AssigneeAziende Colori Nazionali Affini ACNA S.p.A.
InventorsErmanno Gaetani, Sandro Ponzini
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Abstract
New direct dyes which can be diazotized on fibers and have the general formula ##STR1## are disclosed. In the formula, A and B, which are different from each other, are amino-naphtholsulphonic acids. A process for making the new dyes by coupling one mole of a tetrazo derivative of 4,4-diamino-azobenzol with a mixture containing substantially one mole of the amino-naphtholsulphonic acid A and one mole of the different amino-naphtholsulphonic acid B, in an alkaline medium, is also enclosed.
Claims3
A direct dye diazotizable on fibers and having the formula:
- ##STR5## wherein A and B, different from each other, are amino-naphtholsulphonic acids selected from the group consisting of
- 1-amino-8-naphthol-3,6-sulphonic acid;
- 1-amino-8-naphthol-4,
- 6-disulphonic acid;
- 2-amino-8-naphthol-6-sulphonic acid and
- 2-amino-5-naphthol-7-sulphonic acid.
3 more elements
Dependencies are inferred from the claim text.