Patent GB-428070-A (GB)
Title: Manufacture of mixed chromiferous azo-dyestuffs
IPC: C09B45/48
Filed: 1933-11-06
Abstract: Mixed chromiferous azo dyestuffs are made by causing a chromiferous azo dye to react in an alkaline medium with an azo dye containing a group capable of fixing metal and being different from that used for producing the parent chromiferous azo dyestuff, there being present, if desired, several chromiferous azo dyes and also several azo dyestuffs containing a group capable of fixing metal.  They are superior in dyeing properties to those obtained when the process is conducted in a neutral or acid medium and may be used for dyeing or colouring animal fibres, silk, leather and lacquers; or as pigments or in printing.  In examples: (1) the chromium compound of the dyestuff from nitrated 1-diazo-2-naphthol-4-sulphonic acid and 2-naphthol is refluxed in caustic soda solution with the dyestuff 1-amino-2-naphthol-4-sulphonic acid --> b -naphthol (black); (2) the chromium compound of 1-amino-2-naphthol-4-sulphonic acid --> 1-naphthol-8-sulphonic acid or 1-naphthol-8-sulphamide is refluxed with the dyestuff 1 - amino - 2 - naphthol - 4 - sulphonic acid --> a -naphthol in presence of aqueous caustic soda and sugar (blue); (3) the chromium compound of 1-amino-2-naphthol-4-sulphonic acid --> b -naphthol and the dyestuff 6-nitro-2-amino-1-phenol-4-sulphonic acid --> b -naphthol are condensed as in (1) (marine blue); (4) the chromium compound of 1-amino-2-naphthol-4-sulphonic acid --> b -naphthol and the dyestuff 1 - amino - 2 - naphthol - 4 - sulphonic acid --> a -naphthol are treated as in (2); the chromium compound of the dye from nitrated 1-diazo-2-naphthol-4-sulphonic acid --> b -naphthol and the dyestuff 4 - chloro - 2 - aminophenol --> chromotropic acid or the dyestuff 2-amino-phenol-4-sulphonic acid --> 1 : 5-dioxynaphthalene may be similarly treated (violet black and black respectively); (5) and (6) the chromium of the dye from nitrated 1-diazo-2-naphthol-4-sulpho acid and b -naphthol and the reduced unchromed dyestuff are refluxed as in (2) (black); the chromium compound of 2-amino-1-naphthol-4 : 8-disulphonic acid --> b - naphthol and the dyestuff 1 - amino - 2 - naphthol-4-sulphonic acid --> b -naphthol or the chromium compound of the dyestuff from nitrated 1-diazo-2-oxynaphthalene-4-sulphonic acid and b -naphthol and the dyestuff from 1-amino-2-naphthol-4-sulphonic acid (or its nitrated derivative) and a -naphthol may be similarly treated; (7) a solution of the chromium compound of the dyestuff 2-amino-4-sulphobenzoic acid --> 1-(2<1>-methyl-4<1>-sulphophenyl)-3-methyl-5-pyrazolone and the dyestuff anthranilic acid --> 1-(4<1>-sulphophenyl)-3-methyl-5-pyrazolone is neutralized with caustic soda and refluxed with sodium acetate (reddish yellow); (8) the chromium compound of the dyestuff 4-nitro-2-aminophenol-6-sulphonic acid --> acetoacetic anilide and the dyestuff 2-aminophenol-4-sulphonic acid --> acetoacetic anilide are refluxed with sodium carbonate (reddish-yellow); (9) the chromium compound of the dyestuff 1-amino-2-naphthol-4-sulphonic acid --> a -naphthol, the chromium compound of 1 - amino - 2 - naphthol - 4 - sulphonic acid --> b -naphthol, the dyestuff 1-amino-2-naphthol-4-sulphonic acid --> 1 - phenyl - 3 - methyl - 5 - pyrazolone and the dyestuff 2-amino-1-oxy-4-methylbenzene-6-sulphonic acid --> b -naphthol are refluxed in aqueous caustic soda (reddish marine blue).  Examples of the dyeing process are also given. Specifications 297,331, [Class 2 (iii)], 364,148 and 408,497 are referred to.