Anthraquinone dyestuffs containing sulphonic acid groups
AssigneeBayer Aktiengesellschaft
InventorsWalter Hohmann, Klaus Wunderlich, Hans-Samuel Bien
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Abstract
Dyestuffs which contain sulphonic acid groups and correspond to the formula ##SPC1## In which R.sub.1 and R.sub.2 denote lower alkyl radicals with 1 - 3 carbon atoms, which may be substituted; A means an optionally substituted aliphatic, cycloaliphatic, araliphatic, aromatic or heterocyclic radical; n stands for 0, 1 or 2; and R.sub.4 denotes a sulphonic acid group when n = 0 and denotes hydrogen or a sulphonic acid when n = 1 or 2. The dyestuffs are eminently suitable for the dyeing and printing of natural and synthetic polyamide fiber materials.
Claims2
Dyestuff which contains sulfonic acid groups and has the following formula:
- ##SPC45##
- wherein
- R.sub.1 and R.sub.2 are alkyl of 1-3 carbon atoms or substituted alkyl of 1-3 carbon atoms where the substituent is hydroxy or sulphato;
- R.sub.4 is hydrogen or sulfonic acid;
- and
- B is alkyl of 1-6 carbon atoms, allyl, hydroxyethyl, methoxyethyl, aminoethyl, methylaminoethyl, w-carboxypropyl, cyanoethyl, sulphatoethyl, cyclohexyl, hydroxycyclohexyl, 4-methoxycyclohexyl, 3-methylcyclohexyl, 4-methylcyclohexyl, or 4-aminocyclohexyl;
- and B must contain sulfonic acid group when R.sub.4 is hydrogen.
Dependencies are inferred from the claim text.