Abstract: Compounds of the formula ##STR1## in which R.sub.1 signifies a substituted thiazole, thiadiazole, isothiazole, oxadiazole or thiophene radical,R.sub.2 signifies hydrogen or an optionally substituted hydrocarbon radical,R.sub.3 signifies hydrogen or an optionally substituted alkyl radical,R.sub.4 signifies hydrogen or an alkyl radical which is unsubstituted or substituted by an aryl radical,K.sup..sym. signifies an ammonium, cycloimmonium, hydrazinium, aminoxide or optionally substituted etherified hydroxyammonium group,A.sup.n.crclbar. signifies an anion,n signifies 1, 2 or 3, and the ring B is unsubstituted or monosubstituted, provided that at least one of R.sub.3 and R.sub.4 is other than hydrogen, and provided that the molecule does not contain a water-solubilizing group.

Abstract: Azo dyes of the formula ##STR1## wherein D is an aromatic carbocyclic or heterocyclic diazo component radical,R is hydrogen or optionally substituted hydrocarbyl, heterocyclyl or amino,R" is quaternized nitrogen-containing heterocyclyl,R.sub.1 is hydrogen or cyano,R.sub.2 is optionally substituted alkyl, aryl or heterocyclyl,Y is a divalent bridge member,K.sub.1.sup..sym. is optionally substituted ammonium, hydrazinium or quaternized nitrogen-containing heterocyclyl,m is 1 or 2,r is 0 or 1, andA.sup..crclbar. is an anion.The Y.sub.r -K.sub.1.sup..sym. group is preferably attached to the nitrogen atom of the pyridone ring or to the diazo component radical D. These dyes are well-suited for dyeing and printing textiles which consist of or contain fibers of polyacrylonitrile or acrylonitrile copolymers as well as polyamides and polyesters that have been modified to contain acid groups.

Abstract: Dyes of the formula ##STR1## wherein R.sub.1 is a carbocyclic or heterocyclic diazo component radical,R.sub.2 is cyano or acyl,R.sub.3 is alkyl, carbocyclic aryl or heterocyclyl, or a substituted deriive thereof, andR.sub.4 is hydrocarbyl or substituted hydrocarbyl, with the proviso that R.sub.4 is free of sulfo groups and protonizable groups, are useful as disperse dyes for the dyeing and printing of fibres and textiles of synthetic and semi-synthetic, hydrophobic organic substances of high molecular weight. These dyes build up excellently and yield dyeings which are fast to thermofixation, sublimation, pleating, ozone, rubbing, gas fumes, water, sea water, perspiration, alkali and washing.

Abstract: Compounds of the formula ##STR1## wherein EACH OF D.sub.1 and D.sub.2 is independently a diazo component radical, e.g., phenyl, naphthyl, thiazolyl, benzothiazolyl or benzoisothiazolyl, or a substituted derivative thereof,R.sub.1 is divalent hydrocarbyl or substituted hydrocarbyl or a hetero atom-, carbonyl group- or sulfonyl group- containing derivative thereof, e.g., an optionally substituted alkylene, cycloalkylene or phenylene radical, andEach of R.sub.2, R.sub.3, R.sub.4 and R.sub.5 is independently hydrogen, cyano, hydrocarbyl or substituted hydrocarbyl or a hetero atom- containing derivative thereof, --COR.sub.6, --CO.sub.2 R.sub.6, --SO.sub.2 R.sub.6, --CONR.sub.7 R.sub.8 or --SO.sub.2 NR.sub.7 R.sub.8,whereinEach R.sub.6 is independently hydrocarbyl or substituted hydrocarbyl or a hetero atom-containing derivative thereof, andEach R.sub.7 and each R.sub.8 is independently hydrogen or R.sub.6.

Abstract: Dyes of the formula ##STR1## wherein R.sub.1 is hydrogen or cyano,R.sub.2 is alkyl, aryl or heterocyclyl, or a substituted derivative thereof,R.sub.20 is hydrocarbyl, heterocyclyl or amino, or a substituted derivative thereof preferably containing a protonizable nitrogen atom, andD is aromatic carbocyclyl or heterocyclyl, or a substituted derivative thereof, with the proviso that it is free of cationic groups,With the proviso that the molecule contains at least one protonizable nitrogen atom. These dyes are eminently suitable for the dyeing and printing of textiles which consist of or contain fibers of polyacrylonitrile or copolymers of acrylonitrile. The dyes are produced by diazotizing an amine of the formula D-NH.sub.

Abstract: Dyes of the formula ##STR1## wherein R.sub.1 is hydrogen or cyano,R.sub.2 is alkyl, aryl or heterocyclyl, or a substituted derivative there f,R.sub.20 is hydrocarbyl, heterocyclyl or amino, or a substituted derivative thereof preferably containing a protonizable nitrogen atom, andD is aromatic carbocyclyl or heterocyclyl, or a substituted derivative thereof, with the proviso that it is free of cationic groups,With the proviso that the molecule contains at least one protonizable nitrogen atom. These dyes are eminently suitable for the dyeing and printing of textiles which consist of or contain fibers of polyacrylonitrile or copolymers of acrylonitrile. They are suitable for dyeing polyesters and polyamides modified to contain acid groups as well as leather and paper. The dyes have high tinctorial strengths and give level dyeings exhibiting good fastness to light and wet treatments. The dyes are produced by diazotizing an amine of the formula D-NH.sub.

Abstract: Concentrated solutions of cationic azo dyes are prepared directly from sparingly soluble salts of the dye in a one-step reaction by reacting the sparingly soluble dye with a non-chromophoric carboxylate salt, the cation of which forms an insoluble or sparingly soluble salt with the anion of the starting cationic azo dye in the solvent system employed.