GB748421A - New metallisable mono-azo dyestuffs - Google Patents

Abstract

The invention comprises dyestuffs of formula:-<FORM:0748421/IV(c)/1> where X is H, NO2 or Hlg, R is H, an aryl radicle of the benzene series free of sulphonamido groups, an alkyl radicle of 1-3 C atoms or a hydroxyalkyl radicle of 2 or 3 C atoms, and of Y and Z one is H and the other - NH.CO.R1 where R1 is alkyl (C1-C4), alkoxy (C1-C4) or O.C3H4.O AIK where AIK is Me or Et. The invention also comprises chromium and cobalt complexes of the above dyestuffs which contain 0.5-0.75, preferably 0.5, atomic proportions of metal per mol. proportion of dyestuff. The dyestuffs are made by coupling the required diazotized amino-benzesulphonamide and naphthol and they may be metallized in the usual way in a weakly acid or alkaline medium preferably in the presence of an organic solvent and optionally with the addition of dispersing agents. Specified diazo components are 2 - aminophenol - 4 - sulphonamide - sulphon - N - methyl, - isopropyl -, b - hydroxy - ethyl - and - y - hydroxy - n - propyl - amide - sulphoanilide and sulphon - N - d - toluidide and 6 - nitro - and - chloro - 2 - aminophenol - 4 - sulphonamide and sulphon - N - methylamide. Specified coupling components are 1 - acetyl -, - n - butyryl - n - valeryl - car - bomethoxy -, - carboethoxy -, - carbo - n - butoxy -, - carbo - (21 - methoxy) - ethoxy -, and - carbo - (21 - ethoxy) - ethoxy - amino - 6 - naphthol, 2 - acetyl -, - n - butyryl -, - carbomethoxy -, - carboethoxy - and - carboisopropoxyamino - 7 - naphthol. The metallized dyestuffs yield red to violet to grey shades on wool and are also used to dye other nitrogeneous fibres and lacquers, varnishes and other plastic materials. Examples are provided of the use of certain of the above specified components in the preparation of unmetallized and metallized dyestuffs. In the Provisional Specification the sulphonamide group is - SO2 N R1 R2 where R1 is H or a short chain alkyl or hydroxyalkyl radicle and R2 is an aryl radicle of the benzene series free of sulphonamide groups, H or a short chain alkyl or hydroxyalkyl radicle and "AIK" is alkyl of C1 to C4. Additional diazo components specified are 2 - aminophenol - 4 - sulphon - N - di - (b - hydroxyethyl) - and - n - butyl - amide and 2 - aminophenol - 4 - sulphone - N - b - hydroxyethylanilide.