Hydrosoluble pyrazolone trisazo dyestuffs derived from 4,4'-diamino-benzenesulfanilide
AssigneeP C U K Produits Chimiques Ugine Kuhlmann
InventorsPierre Frank, Andre L. Sailer
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Abstract
Dyestuff of the formula: ##STR1## in which A represents a mono- or disulphonated naphthalene residue which is unsubstituted or substituted by a hydroxy group and/or by an amino group, B represents an aliphatic, aromatic or heterocyclic residue and D represents the residue of a pyrazolone or an ester or amide of .beta.-ketonic acid; process for the coloration of animal or polyamide fibres in which the coloring agent is a dyestuff of the above formula and articles based on animal or polyamide fibres colored by means of such a dyestuff.
Claims1
A dyestuff which in the free acid state is represented by the formula:
- ##STR4## wherein X is hydrogen or hydroxy;
- B.sub.1 is the residue of hydroxylated benzene or naphthalene coupling component;
- and
- D.sub.1 is the residue of a pyrazolone.
Dependencies are inferred from the claim text.