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US 4,327,019 AGranted
Acid azo dyes from a 3-amino-benzisothiazole-[2,1]-5-sulfonic acid diazo component
AssigneeBASF SE
InventorsHeinz Eilingsfeld, Guenter Hansen, Guenther Seybold, Georg Zeidler
Life of this patent
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Abstract
Acid monoazo dyes of the formula ##STR1## in which X is hydrogen, chloro, bromo, nitro, C.sub.1 to C.sub.4 alkyl, methoxy, ethoxy or C.sub.2 to C.sub.4 alkanoylamino and K is a radical of a coupling compound as defined below. The dyes are suitable for dyeing natural or synthetic polyamides giving colorations with very good fastness properties.
Claims7
An acid dye which in the form of the free acid has the formula ##STR97## wherein:
- X is hydrogen, chloro, bromo, nitro, C.sub.1 - to C.sub.4 -alkyl, methoxy, ethoxy or NHCO-(C.sub.1 to C.sub.4 -alkyl)
- R.sup.1 is hydrogen, chloro, methyl, methoxy or ethoxy.
Dependencies are inferred from the claim text.