GB387922A - Improved process for reserving fibres to azo-dyestuffs developed from their components - Google Patents

Abstract

Azo dyes, forming on the material; regenerated celluloses, dyeing; printing.--To obtain reserve effects in the production of azo dyes on the fibre the goods, either before or after impregnation with the coupling component, are printed with a xanthate prior to development with the diazo component. Coloured reserve effects are obtainable by incorporating with the xanthate a dyestuff as such or in the form of a leuco compound or leuco ester salt from which the dyestuff is developed before or after the development of the azo dyestuff. The following examples are specified: (1) A cotton fabric is impregnated with an aqueous liquor containing the anilide of 2 : 3-oxynaphthoic acid, caustic soda and turkey red oil, dried, printed with an aqueous solution of potassium xanthate thickened with gum, again dried, and developed with diazotized 4-chloro-2-aminodiphenyl ether to obtain a white pattern on a red ground. (2) A cotton fabric impregnated as in (1) is printed with an aqueous solution, thickened with gum, containing potassium xanthate and Indigosol 04B, developed with a solution of diazotized 4-nitro-3 : 6-dimethyl-1-aminobenzene, and passed through an aqueous solution containing sodium nitrite and hydrochloric acid to obtain a blue pattern on a red ground. (3) A cotton fabric is impregnated with an aqueous liquor containing 4-benzoyl-1-naphthol, caustic soda and turkey red oil, printed with an aqueous solution, thickened with gum, containing potassium xanthate, Ciba blue 2BD paste, potash and hydrosulphite, steamed for 3-4 mins., and developed with a solution of diazotized 4-chloro-2-aminodiphenyl ether to obtain a blue pattern in a red ground. (4) A cotton fabric is impregnated with an aqueous liquor containing the anilide of 2 : 3-oxynaphthoic acid, caustic soda, turkey red oil and Katanol (registered Trade Mark) O, dried, printed with an aqueous solution, thickened with gum, containing potassium xanthate, Methylene blue D and alcohol, developed with a solution of diazotized 4 - chloro - 2 - aminodiphenyl ether, washed and soaped, to obtain a blue pattern on a red ground. (5) A cotton fabric is impregnated with an aqueous liquor containing the tolidide of acetoacetic acid, caustic soda and turkey red oil, printed as in (1) and developed with diazotized m-nitro-p-toluidine to obtain a white pattern on a yellow ground. (6) A cotton fabric, impregnated as in (1) with the anilide of 2 : 3-oxynaphthoic acid is printed with an aqueous solution, thickened with gum, containing potassium xanthate and stannous chloride, dried, and developed with diazotized 4-amino-4<1>-ethoxydiphenylamine to obtain a white pattern on a blue ground. (7) A cotton fabric impregnated with Naphthol AS-LB is printed as in (6) and developed with diazotized 5-nitro-2-aminoanisol. Fabrics of viscose or other regenerated cellulose artificial silk and mixed fabrics, e.g. of cotton and regenerated cellulose, may be similarly treated.