Hydrosoluble pyrazolone trisazo dyestuffs derived from 4,4'-diam

Chemistry of carbon compounds – Miscellaneous organic carbon compounds – C-metal


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260160, 260169, 260167, 260173, 260198, C09B 3322, C09B 3532, C09B 3538, D06P 332




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.

patent: 2259735 (1941-10-01), Crossley et al.
patent: 2656346 (1953-10-01), Knecht et al.
patent: 2676957 (1954-04-01), Armento
patent: 3467645 (1969-09-01), Keller et al.
Reichel et al., "The Journal of the Society of Dyers and Colourists", vol. 74, 1958, p. 598, 2nd Paragraph.


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