1:2 Metal complex dyestuffs of azomethines, process for their preparation and process for dyeing and printing by using these dyestuffs

1:2-Metallkomplexfarbstoffe von Azomethinen der Formel worin R Wasserstoff, gegebenenfalls substituiertes Alkyl, Aralkyl, Aryl, Alkyl- oder Arylsufonyl, A der Rest eines aliphatischen 1,2-oder 1,3-Diamins oder eines carboyclischen oder heterocyclischen 1,2-Diamins, B der Rest eines aromatischen o-Hydroxyaldehyds, Ar1 ein aromatischer Rest, m 1 oder 2 und Ar2 ein aromatisch-carbocyclischer oder heterocyclischer Rest ist, welche sich zum Färben und Bedrucken von Polyamidmaterialien eignen. 1:2 Metal complex dyes of azomethines of the formula wherein R is hydrogen, unsubstituted or substituted alkyl, aralkyl, aryl, alkylsulfonyl or arylsulfonyl, A is the radical of an aliphatic 1,2- or 1,3-diamine or of a carbocyclic or heterocyclic 1,2-diamine, B is the radical of an aromatic o-hydroxyaldehyde, Ar1 is an aromatic radical, m is 1 or 2, and Ar2 is an aromatic-carbocyclic or heterocyclic radical. These dyes are suitable for dyeing and printing polyamide materials. The dyes are distinguished by their excellent fastness properties, especially good lightfastness. They have good covering power; produce level dyeings; and have good fastness to washing, water, perspiration, alkali, acid, diffusion and rubbing. Strong yellow, yellowish brown, reddish brown, dark brown or olive brown shades are obtained.