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US 4,737,240 AGranted
Trisazo black dyes from 2-(4'-aminophenylazo)-7-amino-1-naphthol-3-sulfonic acid
AssigneeCiba-Geigy Corporation
InventorsHerbert S. Davis, Roy E. Smith, Mortimer Weiser
Life of this patent
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Abstract
Black trisazo dyes for cellulosic textiles, leather and especially paper having the structure ##STR1## where A is ##STR2## one of B.sub.1 and B.sub.2 is hydrogen and the other is --SO.sub.3 M or a mixture thereof, and M is hydrogen, sodium, potassium, lithium or --HNR.sub.1 R.sub.2 R.sub.3 wherein R.sub.1, R.sub.2 and R.sub.3 represent the same or different substituents selected from hydrogen, lower alkyl and lower hydroxyalkyl, and stable liquid concentrates of these dyes are described.
Claims15
A compound of the formula
- where A is ##STR8## one of B.sub.1 and B.sub.2 is hydrogen and the other is --SO.sub.3 M or a mixture thereof, and
- M is hydrogen, sodium, potassium, lithium or HNR.sub.1 R.sub.2 R.sub.3 wherein R.sub.1, R.sub.2 and R.sub.3 represent the same or different substituents selected from the group consisting of hydrogen, lower alkyl and lower hydroxylalkyl.
Dependencies are inferred from the claim text.