Azo dyestuffs
AssigneeBayer Aktiengesellschaft
InventorsHorst Nickel, Karl H. Schundehutte
Life of this patent
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Abstract
Azo dyestuffs which, in the form of the free acid, correspond to the formula ##STR1## wherein R.sub.1 denotes hydrogen, methyl or chlorine, R.sub.2 denotes hydrogen, chlorine, acetylamino, methoxy, ethoxy, nitro or carboxyl, R.sub.3 denotes hydrogen, sulpho-C.sub.1 -C.sub.2 -alkyl, carboxy-C.sub.1 -C.sub.2 -alkyl or C.sub.1 -C.sub.4 -alkyl, R.sub.4 denotes hydrogen or C.sub.1 -C.sub.4 -alkyl, R.sub.5 denotes hydrogen or acyl and R.sub.6 denotes hydrogen, methyl, methoxy, ethoxy, chlorine, carboxyl, nitro or sulpho, and their preparation and use for dyeing substrates which can be dyed with direct dyestuffs.
Claims5
Dyestuffs which, in the form of the free acid, correspond to the formula ##STR5## wherein R.sub.1 denotes hydrogen, methyl or chlorine,
- R.sub.2 denotes hydrogen, chlorine, acetylamino, methoxy, ethoxy, nitro or carboxyl,
- R.sub.3 denotes hydrogen, sulpho-C.sub.1 -C.sub.2 -alkyl, carboxy-C.sub.1 -C.sub.2 -alkyl or C.sub.1 -C.sub.4 -alkyl,
- R.sub.4 denotes hydrogen or C.sub.1 -C.sub.4 -alkyl,
- R.sub.5 denotes hydrogen or acyl and
- R.sub.6 denotes hydrogen, methyl, methoxy, ethoxy, chlorine, carboxyl, nitro or sulpho.
Dependencies are inferred from the claim text.