Aminosulfonylphenyl-azo-indolyl dyestuffs
AssigneeBayer Aktiengesellschaft
InventorsRichard Sommer, Gerhard Wolfrum, Hans Gunter Otten
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Abstract
Monoazo dyestuffs which in the form of the free acid correspond to the general formula ##STR1## wherein R.sub.0, R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6 and R.sub.7 have the meaning given in the description and their use for the dyeing of natural and synthetic fibre materials, especially for dyeing polyamide fibres. Dyeings obtained distinguish themselves by very good fastness to light. Dyestuffs are absorbed well on polyamide fibres already in a neutral to weakly acid dye bath. By polyamide fibres there are here especially understood those from synthetic polyamides such as .EPSILON.-polycaprolactam, or condensation products of adipic acid and hexamethylenediamine.
Claims3
Monoazo dyestuff which in the form of the free acid corresponds to the formula ##STR63## wherein R.sub.o denotes hydrogen;
- C.sub.1 -C.sub.6 -alkyl;
- C.sub.1 -C.sub.6 -alkyl substituted by hydroxy, chlorine, bromine, cyano, C.sub.1 -C.sub.4 -alkoxy or C.sub.1 -C.sub.4 -alkoxycarbonyl;
- cyclohexyl;
- phenyl;
- naphthyl;
- tolyl;
- benzyl;
- phenethyl;
- 3-sulfolanyl;
- R.sub.1 denotes hydrogen;
- C.sub.1 -C.sub.6 -alkyl;
- C.sub.1 -C.sub.6 -alkyl substituted by hydroxy, chlorine, bromine, cyano, C.sub.1 -C.sub.4 -alkoxy or C.sub.1 -C.sub.4 -alkoxycarbonyl;
- cyclohexyl or together with R.sub.o a piperidino, pyrrolidino or morpholino ring;
- R.sub.2 and R.sub.3 denote chlorine or bromine
- R.sub.4 denotes hydrogen;
- R.sub.5 denotes C.sub.1 -C.sub.4 -alkyl, phenyl, naphthyl or biphenylyl;
- R.sub.6 denotes hydrogen;
- C.sub.1 -C.sub.4 -alkyl, C.sub.1 -C.sub.4 -alkyl substituted by cyano, carbonamide or carboxy;
- and
- R.sub.7 denotes hydrogen, chlorine or C.sub.1 -C.sub.4 -alkyl.
Dependencies are inferred from the claim text.