GB589329A - Manufacture of azo-dyestuffs - Google Patents

Abstract

Azo dyestuffs are manufactured by coupling a diazo-compound of a disazo-dyestuff of the general formula <FORM:0589329/IV/1> (wherein one x and one y represent hydrogen and the other x and the other y represent hydrogen or a sulphonic acid group) with 2-amino-5-naphthol-7-sulphonic acid or a derivative thereof, especially its N-substitution products and also its derivatives capable of coupling twice in alkaline medium. Coupling may be effected either in acid or alkaline medium where both are possible. Examples describe the production of the dyestuffs p 1-amino-2 : 6 - dichloro - 4 - nitrobenzene --> 1 - amino - naphthalene-6- or -7-sulphonic acid or a mixture thereof --> 1-aminonaphthalene or its 6- or 7-sulphonic acid --> (alkaline) 2 : 5 : 7-aminonaphtholsulphonic acid or its N-phenyl-derivative, and the use of certain of the products for dyeing cotton and viscose artificial silk in grey shades. Other end components specified are: N - (41 - methoxy) - phenyl-, N - (41 - hydroxy - 31 - carboxy) - phenyl and N - benzoyl - J - acid, the secondary condensation product from 1 mol. of cyanuric chloride, 1 mol. of J-acid and 1 mol. of metanilic acid, the ternary condensation product from 1 mol. of cyanuric chloride, 1 mol. of J-acid, 1 mol. of metanilic acid and 1 mol. of aniline, J-acid urea and 5 : 51-dihydroxy-2 : 21-dinaphthylamine - 7 : 71 - disulphonic acid. Specifications 3673/00, [Class 2], 227,440, [Class 2 (ii)], and 299,791, [Class 2 (iii)], are referred to. The Specification as open to inspection under Sect. 91 comprises also the use, as end components, of other sulphonated aminonaphthalene derivatives, e.g. 1-phenyl- and 1-(41-methyl)-phenyl - aminonaphthalene - 8 - sulphonic acid, 2 : 8 : 6-aminonaphtholsulphonic acid and its N-acetyl, N-benzoyl and N-(41-methyl- or 41-methoxy)-phenyl derivatives, 1 : 5 : 7-aminonaphtholsulphonic acid and its N-phenyl derivative, 2 : 8 : 3 : 6- and 2 : 5 : 1 : 7-aminonaphtholdisulphonic acids, and the ternary condensation product from 1 mol. of cyanuric chloride, 1 mol. of 1 : 8 : 3 : 6- acid and 2 mols. of aniline. An additional example describes the preparation of the dyestuff 1-amino-2 : 6-dichloro - 4 - nitrobenzene --> 1 - aminonaphthalene - 7 - sulphonic acid --> 1 - aminonaphthalene-7-sulphonic acid --> the secondary condensation product from 1 mol. of cyanurie chloride, 1 mol. of 1 : 8 : 3 : 6-acid and 1 mol. of aniline. This subject-matter does not appear in the Specification as accepted.