GB439680A - Improvements in the manufacture and production of azo dyestuffs - Google Patents

Abstract

Azo dyes are made by coupling diazo compounds of amines of the general formula <FORM:0439680/IV/1> (in which A = an aromatic hydrocarbon residue and Y = H, CH3, NO2 or SO3H), with azo dyestuff components. They may be converted on the fibre or in substance into complex metal compounds the latter yielding level dyeings fast to washing and fulling. In examples dyestuffs and their chromium compounds from the following components are described: N-(3<1>-aminobenzenesulphonyl -, N - (3<1> - amino - 6<1> - methylbenzenesulphonyl) - and N - (4<1> - amino - 3<1> - chlorobenzenesulphonyl) - 3 - amino - 2 - hydroxy - 5 - sulphobenzene - 1 - carboxylic acid, N - (3 - aminobenzenesulphonyl) - 3 - amino - 2 - hydroxy - 5 - methylbenzene - 1 - carboxylic acid and its 6<1> - methyl derivative, N - (3<1> - aminobenzenesulphonyl) - 3 - amino - 2 - hydroxybenzene - 1 - carboxylic acid; 3 - methyl - 5 - pyrazolone, 1 - phenyl - 3 - methyl - 5 - pyrazolone, 1 - (2<1> - chlorophenyl) - 3 - methyl - 5 - pyrazolone, 1 - (2<1> - chloro - 5<1> - sulphophenyl) - 3 - methyl - 5 - pyrazolone, 2 : 4 - dihydroxyquinoline, b - naphthol and its sulphonic acids, resorcinol. Other diazo components specified are: N-(3<1>-amino-4<1>-methoxybenzenesulphonyl) - 3 - amino - 2 - hydroxy - 5 - sulphobenzene - 1 - carboxylic acid and N - (3<1> - aminobenzenesulphonyl) - 3 - amino - 2 - hydroxy - 5 - nitrobenzene - 1 - carboxylic acid, Specifications 10168/13, [Class 2 (iii)], and 432,353 are referred to.