GB288572A - Process for the manufacture of a new diazo compound and of new dyestuffs derived therefrom - Google Patents

Abstract

288,572. Compagnie Nationale de Matieres Colorantes et Manufactures de Produits Chemiques du Nord RÚunies Etablissements Kuhlmann. April 12, 1927, [Convention date]. 4-Chlorobenzenediazooxide is obtained by the action of alkalies, such as an alkali or alkaline earth carbonate or a salt of an organic acid, e.g. sodium acetate, on diazotized 2-nitro-4-chloraniline. Azo dyes and soluble metal compounds thereof. -The above-described 4-chlorobenzenediazooxide is capable of coupling with azo components in absence of free alkali and with the production of purer shades than are obtained when free alkali is present. The dyestuffs yield on wool in an acid bath bright dyeings which are rendered very fast and often changed in shade by after-chroming. They also yield metal compounds when treated in substance with metallic salts, e.g. salts of copper or chromium. In examples, the preparation and properties are described of the dyestuffs obtained by coupling with the following components : - resorcin, 2-naphthol-3 : 6-disulphonicacid, 1 : 8-aminonaphthol-4 : 6-disulphonic acid, 1 : 8 - dioxynaphthalene - 3 : 6-disulphonic acid, 1-(4<1>-sulphophenyl)-3-methyl-5-pyrazolone, 1 : 8- aminonaphthol-4 : 6-disulphonic acid with subsequent conversion into the copper compound, and 1-(p-sulphophenyl)-5-pyrazolone-3-carboxylic acid with subsequent conversion into the chromium compound. A table is also given showing the properties of the dyestuffs obtained by coupling with the following additional components :-1- naphthol, 1 : 4 (or 2: 6)-naphthol sulphonic acid, 2: 5: 7 acid, 2: 8: 6 acid, phenyl-2: 5 : acid, 1: 8: 4 acid, 1: 8-aminonaphthol-2 : 4 (or 3: 6-) disulphonic acid, and 1 : 8-dioxynaphthalene-4- sulphonic acid.