GB825431A - Improvements relating to copper containing disazo dyestuffs of the stilbene series - Google Patents

Abstract

The invention comprises copper complexes of dyestuffs of formul <FORM:0825431/IV(c)/1> where Ar is a naphthylene residue, which may be substituted by sulphonic acid groups, bound to the N atoms by adjacent carbon atoms, B is an acyl residue and R is CH3, C2H5 or CH2COOH. They are made by coupling an appropriate diazotized aminoazo stilbene with a 2-acylamino-6-naphthol-8-sulphonic acid and coppering the product or by coupling a diazo compound of an amine of formula <FORM:0825431/IV(c)/2> with a 2-acylamino-6-naphthol-8-sulphonic acid, reducing the NO2 group to NH2 and, after diazotizing, coupling the disazo dyestuff with a naphthalenic end component which couples o to the NH2 group, oxidizing the product, and either simultaneously or subsequently coppering the triazole thus produced. The acyl residue may be derived from a sulphonic or preferably a carboxylic or carbonic acid. The aminoazo stilbenes used in the first method are made by coupling diazotized 41-amino-4-[4,5-naphtho-1,2,3 - triazolyl - (2)] - stilbene - 2,21 - disulphonic acids with appropriate 2-alkoxynaphthylamine sulphonic acids. Specified naphthylamine end components from which the triazole ring may be derived are 2-naphthylamine and its -1-, -5-, -6-, -7- and -8-mono- and -3,6-, -5,7- and -6,8-disulphonic acids and 1-naphthylamine-3- and -4-sulphonic acids. Specified acetylaminonaphthols are 2-acetyl-, -carbomethoxy-, -sulphoacetyl-, -benzyl- and -m- and -p-aminobenzoyl-6-naphthol-8-sulphonic acids. The alkali metal salts of the copper complexes are soluble in water and dye cellulosic material from a bath containing Glauber's salt in green shades. Examples are provided illustrating the preparation of the dyestuffs and their use in dyeing cotton and regenerated cellulose, the components used being chosen from those listed above with the addition of methyl- and chloromethyl-sulphonyl-, propionyl- and carboethoxy-amino as 2-acetylamino groups and the 2-alkoxynaphthylamine sulphonic acids used are 2-methoxy and methoxycarboxy-1-naphthylamine-6-sulphonic acids. Specification 503,576, [Group IV], is referred to.