Water-soluble trisazo 8-amino-naphthol-1 dyes
AssigneeCassella Farbwerke Mainkur Aktiengesellschaft
InventorsWolfgang Bauer, Erwin Krusche, Joachim Ribka
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Abstract
Very effective direct dyeing of cotton and other hydroxyl- or nitrogen-containing fibers is effected with water-soluble triasazo dyes having the formula: A-N=N-A.sup.1 -N=N-A.sup.2 -N=N-A.sup.3 where A is a radical of a diazoconstituent and A.sup.3 is a radical of a coupling constituent ##STR1## and A.sup.1 or A.sup.2 or both can have their azo linkages reversed. These dyes are very fast particularly to washing and to perspiration, and are so effective with cotton that dye baths for such use are rapidly exhausted and the disposal of used bath is less of a problem.
Claims20
A water-soluble dye having the formula
- A-N=N-A.sup.1 -N=N-A.sup.2 -N=N-A.sup.3
- where A.sup.1 is selected from the class consisting of ##STR40## n being 1 or 2, A.sup.2 is selected from the class consisting of ##STR41## X being ##STR42## --S--, or --O--, and R being hydrogen or lower hydrocarbyl free of non-aromatic unsaturation,
- A is a radical of a diazo component, and
- A.sup.3 is a radical of a coupling component,
- each of A and A.sup.3 having a carbon-containing aromatic ring connected by such carbon to the azo linkages.
A water-soluble dye having the formula
- A-N=N-A.sup.1 -N=N-A.sup.2 -N=N-A.sup.3
- where A.sup.1 is selected from the class consisting of ##STR45## n being 1 or 2, A.sup.2 is selected from the class consisting of ##STR46## X being ##STR47## --S--, or --O--, and R being hydrogen or lower hydrocarbyl free of non-aromatic unsaturation,
- A is selected from the class consisting of unsubstituted or substituted phenyl, naphthyl and dehydrothiotoluidinyl, the substitution being selected from the class consisting of:
- alkyl having 1 to 4 carbon atoms,
- alkoxy having 1 to 4 carbon atoms,
- alkylthio having 1 to 4 carbon atoms,
- hydroxy,
- cyano,
- nitro,
- sulfo,
- carboxy,
- chloro,
- bromo,
- alkoxycarbonyl having 1 to 4 carbon atoms in the alkoxy radical,
- alkylcarbonyl having 2 to 5 carbon atoms,
- aminocarbonyl,
- alkylaminocarbonyl having to 1 to 4 carbon atoms in the alkyl radical,
- alkylamino having 1 to 4 carbon atoms in the alkyl radical,
- arylamino having 6 to 12 carbon atoms,
- alkylcarbonylamino having 2 to 5 carbon atoms,
- aminosulfonyl, and
- alkylaminosulfonyl having 1 to 4 carbon atoms in the alkyl radical, and
- A.sup.3 is acetoacetic acid arylamide.
Dependencies are inferred from the claim text.