GB335523A - Manufacture of dyestuffs - Google Patents

Abstract

335,523. Soc. of Chemical Industry in Basle, Straub, F., and Anderau, W. April 23, 1929. Addition to 307,705. Disazo and trisazo dyes and soluble metal compounds thereof. - The disazo and trisazo dyes obtainable by coupling with the monoazo dyestuff 2-amino-5-naphthol-7-sulphonic acid # (acid) 2-amino-5-naphthol-7-sulphonic acid either 1 mol. of an o-oxydiazo compound, or 2 mols. of an o-carboxydiazo compound, or 1 mol. of an o-oxydiazo compound containing no ooxyazo group, the use of diazo components containing o-oxycarboxy groups being excluded, are treated in an aqueous medium, in the course of their production, in substance, in the dyebath, or on the fibre, with an agent yielding chromium or yielding one or more suitable metals having atomic weights within the range 45-59, e.g. manganese, iron, cobalt, or nickel. In addition to the above metals other suitable metals, e.g. copper, may be introduced. The products give fast dyeings on animal, vegetable, or regenerated cellulose fibres from acid, neutral, or alkaline baths. The following examples are specified, (1) 1 Mol. of the dyestuff 2: 5: 7-acid # (acid) 2: 5: 7-acid is coupled (alkaline) with 1 mol. of diazotized 4-chloro-2-aminophenol, and the disazo product is heated for 25-30 hrs. under reflux with chromium fluoride solutions; the product dyes vegetable and regenerated cellulose fibres level grey shades from a neutral or alkaline Glauber's salt bath; if the final diazo component is replaced by 4-chloro-2- aminophenol-6-sulphonic acid the dyeings are blue-grey; if 4-nitro-2-aminophenol is used the dyeings are green-grey. (2) 1 Mol. of the dyestuff 2:5: 7-acid # (acid) 2:5: 7-acid is coupled (alkaline) with 2 mols. of diazotized anthranilic acid, and the trisazo product is boiled for 15-20 hrs. with chromium fluoride solution; the product dyes vegetable fibres violet shades from a neutral or alkaline bath; if the trisazo product is treated with a solution containing copper sulphate and chromium fluoride the product gives red-violet dyeings. (3) 1 Mol, of the dyestuff 2 : 5 : 7-acid # (acid) 2:5: 7-acid is coupled (alkaline) with 1 mol. of diazotized 4- chloro-2-aminophenol-6-sulphonic acid and 1 mol. of diazotized anthranilic acid, and the trisazo product is boiled for 24 hrs. with chromium fluoride solution; the product gives level bluegrey dyeings on cotton and viscose; if the trisazo product is treated with a solution containing copper sulphate and chromium fluoride or acetate the product gives violet or blueviolet dyeings. (4) 1 Mol. of the dyestuff 2:5: 7-acid # (acid) 2 : 5 : 7-acid is coupled (alkaline) with 1 mol. of diazotized 4-chloro-2- aminophenol and 1 mol. of diazotized 4- nitraniline-2-sulphonic acid, and the trisazo product is heated for 36 hrs. under reflux with chromium fluoride solution; the product dyes cotton and viscose level grey shades from a neutral or alkaline bath. Specification 26460/12, 16803/15, 271,897, 297,003, and 300,916 are referred to. Reference has been directed by the Comptroller to Specifications 16803/15, 271,897, 297,003, and 300,916.