GB318832A - Process for producing fast tints on artificial silk of regenerated cellulose - Google Patents

Abstract

318,832. Soc. of Chemical Industry in Basle. Sept. 7, 1928, [Convention date]. Azo dyes and soluble chromium. compounds thereof.-Level dyeings, fast to light, water, and washing, are obtained on regenerated cellulose silks by the use of chromium compounds of dyestuffs containing no cyanuric nucleus obtainable by coupling o-oxydiazo or o-carboxydiazo compounds, containing not more than one sulphonic or one carboxylic group and containing no o-oxycarboxylic grouping, with 2 : 5 : 7-aminonaphtholsulphonic acid or its N-acidyl, N-alkyl, N-aralkyl, or N-aryl derivatives. The use of the chromium compounds of Specifications 295,594 and 296,680 is excluded. Dyeing is effected in a neutral' or feebly alkaline bath or in a bath feebly acid with acetic acid. A table is given showing the tints obtained on viscose with the chromium compounds of the following dyestuffs, all couplings being in alkaline solution :-5-nitro-2-aminophenol # phenyl-2 : 5 : 7-acid or (4<1>-oxy-3<1>=carboxy)- phenyl-2 : 5 : 7-acid : 6-nitro-2-aminophenol-4-sulphonic acid, 4 : 6-nitro-2-aminophenol, or anthranilic acid # phenyl-2 : 5 : 7-acid; 4-chloro- 2-aminophenol (2 mols.), 4 (or 5)-nitro-2-aminophenol (2 mols.), 4: 6-dinitro-2-aminophenol (2 mols.), 2-aminophenol-4-sulphamide (2 mols.), or 4-nitro-2-aminophenol-6-sulphonic acid (2 mols.) #2: 2<1>-dinaphthylamine - 5 : 5<1>-dioxy-7 : 7'-disulphonic acid; 5-nitro-2-aminophenol (2 mols.) # the product obtained by coupling tetrazotized benzidine (1 mol.) with 2 2<1>-dinaphthylamine - 5 : 5<1>-dioxy - 7 : 7<1>- disulphonic acid (2 mols.); 2-aminophenol-4-sulphamide (2 mols.) # the urea of 2 : 5 : 7-acid. Specifications 253.659 and 306.908 also are referred to. The Specification as open to inspection under Sect. 91 (3) (a) comprises also the use of the chromium compound of the dyestuff 4-chloro-2- aminophenol (2 mols.) # the product obtained by coupling diazotized 2 : 5 : 7-acid (1 mol.) in acid solution with 2 : 5 : :7-acid (1 mol.) This. subject-matter does not appear in the Specification as accepted.