Water-soluble tetrakisazo dyestuffs derived from 4,4'-diaminoazobenzene
AssigneeProduits Chimiques Ugine Kuhlmann
InventorsPierre Frank, Andre L. Sailer
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Abstract
Dyestuffs of the formula: ##STR1## in which C.sub.2 represents the radical of the formula: ##STR2## where X is NH.sub.2 or OH, C.sub.1 and C.sub.3 are different residues of molecules C.sub.1 H and C.sub.3 H free from azo groups and selected from the group consisting of acetylacetic derivatives, pyrazolonic derivatives, benzenic derivatives, and naphthalenic derivatives, only one of the molecules C.sub.1 H and C.sub.3 H being a naphthalenic derivative, one at least of the residues C.sub.1 and C.sub.3 having at least one and at most two sulphonic acid groups, and n having the value 0 or 1 and leather colored with such dyestuffs.
Claims4
Dyestuff of the formula:
- ##STR7## wherein C.sub.1 is selected from the group consisting of
- ethyl-acetylacetate-2 yl;
- 1-phenyl-3-methyl-4-yl-5-pyrazolone, in which the benzene nucleus is substituted by a sulphonic acid group in the 3' or 4' position or by two sulphonic acid groups in the 2', 5' positions and by from 0 to 2 chlorine atoms;
- 1-(4'-sulphophenyl)-4-yl-3-carboxy-5-pyrazolone;
- acetoacetanilide-2-yl;
- phenol-yl;
- 1,3-dihydroxybenzene-yl;
- 1,3-diaminobenzene-yl;
- 2,4-diaminotoluene-yl;
- and
- 1-aminonaphthalene-yl-6- or 7-sulpho;
- C.sub.3 is a phenyl substituted by one sulphonic acid group in the 3 or 4 position or by two sulphonic acid groups in the 2,5-positions or by one sulphonic acid group in the 2- and one methyl in the 4-positions or by one sulphonic acid group in the 5- and one chloro in the 2-positions;
- X is OH or NH.sub.2 ;
- each of the residues C.sub.1 and C.sub.3 having at least one and at most two sulphonic acid groups;
- C.sub.1 is a residue of a coupling component C.sub.1 H and C.sub.3 is a residue of a diazotisable amine C.sub.3 NH.sub.2.
Dependencies are inferred from the claim text.