Hoechst Aktiengesellschaft

Konrad Lohe

Klaus Hunger

Reinhard Mohr

Ernst Klappert

Valuable pigments are obtained by diazotizing 1-aminobenzene-2-(carboxylic acid methyl or ethyl ester)-5-(2',3'-dichloro-anilide) and coupling it onto 1-(2'-hydroxy-3'-naphthoylamino)-4-acetamino-benzene. The resulting pigments are then subjected to a thermal aftertreatment. These pigments show a high tinctorial strength, a pure shade, a high fastness to migration, especially to overlacquering, to light and weathering and a high heat stability.

Monoazo compounds from 1-aminobenzene-2-carboxylic acid derivatives and

Dyestuffs of the formula ##EQU1## IN WHICH Alk is lower alkyl and in which the phenyl nucleus may be further substituted by nonionic substituents and n is 2 to 6, are useful for dyeing polymers containing acidic groups. These dyestuffs yield stable compositions containing 20 to 40 % by weight of one or more of said dyestuffs, 20 to 40 % by weight of an organic solvent, by weight of an organic solvent, 20 to 40 % by weight of a nonionic dispersant of the alkylphenol polyglycolether or fat alcohol polyglycolether type and up to 20 % by weight of water.

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Rembrucken, Germany

Konrad Lohe