GB482240A - Primary trisazo-dyestuffs derived from resorcinol, their copper compounds and process for their manufacture - Google Patents

Abstract

Primary trisazo dyes are made by combining resorcinol in an alkaline solution, firstly with a diazotized negatively substituted o-aminophenol of the benzene series (1 mol.), secondly with a nitrodiazo compound (1 mol.) and finally with a diazotized nitroaminodiphenylamine sulphonic acid (1 mol.). The copper compounds of the dyes are made by treating with a copper salt in substance, in the dye-bath or by after-treatment of the dyeings. The dyes and their copper compounds yield clear neutral brown shades on silk and leather. In examples dyes from the following components are described (1) (i) 2 - nitro - 6 - amino - 1 - phenol - 4 - sulphonic acid or the isomeric 4 : 6 : 1 : 2-compound, picramic acid, (ii) p-nitroaniline, 2-chlor-4-nitroaniline, 4-nitroaniline-2-sulphonic acid, 2 - nitroaniline - 4 - sulphonic acid, 4-nitro-41-aminodiphenylamine-2-sulphonic acid, (iii) 4-nitro - 41 - aminodiphenylamine - 2 - sulphonic acid; the copper compound is made by treating with aqueous copper sulphate; (2) (i) 3-amino-2 - hydroxybenzene - 1 - carboxylic - 5 - sulphonic acid, (ii) 4-nitroaniline-2-sulphonic acid or p-nitroaniline, (iii) 4-nitro-41-aminodiphenylamine-2-sulphonic acid; the copper compound is made by heating with qqueous copper sulphate and sodium acetate. Other diazo components specified are (i) 4- or 5-nitro-2-aminophenol, 3-amino-2-hydroxybenzoic acid, 4 : 6-dinitro-2-aminophenol, (ii) o- and m-nitroaniline and nitroaminodiphenylaminesulphonic acids, (iii) 2-nitro-41-aminodiphenylamine-4-sulphonic acid. Specification 447,775 is referred to. The Specification as open to inspection under Sect. 91 comprises the use of the following diazo compounds in the order stated (i) a negatively substituted o-aminophenol, (ii) any desired diazo component, (iii) an aminodiphenylamine sulphonic acid and refers to the treatment of the dyes with a metal salt, e.g. of chromium, aluminium, titanium, vanadium, manganese, iron, cobalt and nickel singly or mixed. The conversion of the dyestuffs described in German Specification 629,743 into metal compounds is mentioned. Such dyes are made by coupling resorcinol in any order with a diazotized 4-aminodiphenylamine-2-sulphonic acid (1 mol.), diazotized 2-amino-6-nitro-1-phenol-4-sulphonic acid or 4 : 6-dinitro-2-aminophenol (1 mol.) or a mixture of these two diazo compounds and finally with a diazo compound of the benzene series (1 mol.). This subject-matter does not appear in the Specification as accepted.