GB425990A - Process for the manufacture of azodyestuffs containing copper - Google Patents

Abstract

Complex copper compounds of azo-dyes are made by treating a trisazo dye of the general formula <FORM:0425990/IV/1> in which R1 may be substituted and R2=a benzene or naphthalene residue containing at least one SO3H group, with an agent yielding copper under conditions such that the two methoxy groups are split up. They yield fast blue to grey shades on cotton. In examples: (1) the dyestuff <FORM:0425990/IV/2> is heated with aqueous copper sulphate and ammonia; (2) the corresponding dyestuff from 2-naphthol-5 : 7-disulphonic acid is similarly treated. Organic bases may be used instead of ammonia. Specification 366,580 is referred to. The Specification as open to inspection under Sect. 91 comprises also the treatment of dyestuffs of the formula <FORM:0425990/IV/3> in which R1 and R4 may also represent carbazole residues. The following examples are given: (1) the dyestuff 4 : 4<1>-diamino-5 : 5<1>-dimethoxy-2-methyl-1 : 1<1>-azobenzene-2<1>-sulphonic acid \sQ 1-naphthol-4 : 8-disulpho acid is treated with ammoniacal copper sulphate; the dyestuff 4 : 4<1>-diamino-5 : 5<1>-dimethoxy-1 : 1<1>-azobenzene \sQ 2-amino-5-naphthol-1 : 7-disulphonic acid may be similarly treated; (2) the dyestuff 5-nitro-2-anisidine --> 1-naphthol-3 : 6-disulphonic acid is reduced with alkaline glucose and the product coppered as above; the coupling component may be 8-chlor-1-naphthol - 3 : 6 - disulphonic acid or 1 naph-thol - 3 : 8 - disulpho acid and the diazo component may be p 5-nitro-4-chlor- or 4-methyl-2-anisidine or 5-nitro-2-amino-1 : 4-dimethoxy-benzene; (3) the dyestuff 5-nitro-2-anisidine --> 2-naphthol- 5 : 7-, 3 : 6- or 3 : 7-disulpho acid is reduced as above; (4) the dyestuff 5-nitro-2-anisidine --> (alkaline) 2-(3<1>-carboxyphenyl) amino-8-naphthol-6-sulpho acid is reduced with alkaline grape sugar and coppered as above; N-(3<1>-sulphophenyl)- or N-(4<1>-carboxyphenyl) - 2 : 8 : 6 - acid, N-(3<1>-carboxyphenyl) - 2 : 5 : 7 - acid or 2 - amino-5-naphthol-1 : 7-disulpho acid may be used as coupling component; (5) the dyestuff 5-nitro-2-anisidine --> 1-hydroxy- or 1 : 8- or 2 : 8-dihydroxycarbazole-3 : 6-disulpho acid is reduced and coppered as above. The products also dye regenerated cellulose. This subject-matter does not appear in the Specification as accepted.