GB462561A - The manufacture of black sulphur dyestuffs - Google Patents

Abstract

Black sulphur dyestuffs are obtained by acting with alkali polysulphides upon a mixture of a 4-hydroxyphenylaminonaphthalene or a corresponding quinone-imine or a derivative thereof having halogen atoms or carboxylic groups in the phenyl nucleus with an indophenol or leuco indophenol derived from an amine of the benzene, naphthalene or carbazole series and a p-amino or nitroso phenol or a halogen or carboxylic acid derivative thereof. Aromatic nitro or amino compounds containing further nitro, amino or hydroxy groups may also be present. In examples, the following mixtures are sulphurized: 2-(4<1>-hydroxyphenylamino)-naphthalene, 3 - (4<1> - hydroxyphenylamino)-carbazole and p- or o-aminophenol, 1-(4<1>-hydroxyphenylamino)naphthalene, 3<1> - (4<1>-hydroxyphenylamino)carbazole and p-aminophenol, 2 - (4<1> - hydroxy - 3<1> - carboxyphenylamino)naphthalene, 3<1> - (4<1> - hydroxyphenylamino)carbazole and m - toluylenediamine, 2<1> - (4<1> - hydroxyphenylamino)naphthalene and 3 - (4<1> - hydroxyphenylamino N - ethylcarbazole, 2 - (4<1> - hydroxyphenylamino)naphthalene and the indophenol prepared from diphenylamine and p-nitrosophenol. The sulphurization is effected by means of a solution prepared from caustic soda, sulphur and n-propylalcohol, methylcyclohexanol, butanol or ethylalcohol. An oxidizing agent, e.g. sodium nitrate facilitates the reaction. The use of the indophenol obtained from m-phenylenediamine and p-aminophenol, and also phenylene diamines dinitronaphthalenes and nitrocarbazoles as the third component is mentioned. Specification 25457/11, [Class 2 (iii)], is referred to.