Heterocyclic azo dyes containing cyanothiophene derivatives as diazo components and diaminopyridines as coupling components
AssigneeBASF SE
InventorsJohannes Dehnert, Gunther Lamm, Hermann Loeffler
Life of this patent
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Abstract
The novel dyes of the general formula I ##STR1## where X is hydrogen or C.sub.1 14 C.sub.4 -alkyl or is phenyl which is unsubstituted or substituted by fluorine, chlorine, bromine, methyl, methoxy or nitro, Y is cyano, a carboxylic ester group or nitro, Z is cyano, acetyl, benzoyl or unsubstituted or substituted carbamyl, or X and Z or Y and Z may simultaneously be a carboxylic ester group, and R.sup.1 and R.sup.2 independently of one another are each hydrogen or unsubstituted or substituted alkyl or aryl, are very useful for dyeing polyesters, polyester/cellulose blends or thermoplastics.
Claims6
A compound of the formula I ##STR38## where X.sub.1 is hydrogen or methyl, Y.sub.1 is cyano, and
- B.sup.1 and B.sup.2 independently of one another are each hydrogen or
- (i) C.sub.2 -C.sub.8 -alkyl which is unsubstituted;
- (ii) C.sub.2 -C.sub.8 -alkyl which is substituted by hydroxyl, C.sub.1 -C.sub.8 -alkanoyloxy, C.sub.1 -C.sub.4 -alkoxy, benzyloxy, or phenoxy;
- (iii) C.sub.2 -C.sub.8 -alkyl which is interrupted by oxygen exclusive of (ii);
- (iv) C.sub.2 -C.sub.8 -alkyl which is interrupted by oxygen and substituted by hydroxy, C.sub.1 -C.sub.8 -alkanoyloxy, C.sub.1 -C.sub.4 -alkoxy, benzyloxy or phenoxy, exclusive of (ii) and (iii);
- `(v) phenyl which is unsubstituted;
- or
- (vi) phenyl which is substituted by methyl or methoxy.
Dependencies are inferred from the claim text.