Patent GB-555810-A (GB)
Title: Textile printing process
IPC: D06P5/15
Filed: 1942-03-06
Abstract: 555,810. Dyeing textiles. BRITISH CELANESE, Ltd. March 6, 1942, Nos. 2944 and 2945. Convention dates, March 29, 1941 and April 16, 1941. [Class 15 (ii)] Printing. Vat-dye-coloured discharges on azo dye grounds on textile materials made of or containing fibres of a cellulose ester or ether, are obtained by the use of a reducing discharge composition containing the vat. dye and an alkaline-reacting salt of an acid of phosphorus, boron, silicon or sulphur. Specified salts are the alkali metal salts of phosphoric, phosphorous, tetraboric, silicic or 'sulphurous acid or of hydrogen sulphide, e.g. di- and tri-sodium or potassium orthophosphates, sodium tetraborate, sodium silicate, sodium sulphite or sodium sulphide. In examples, (1) a cellulose acetate fabric, dyed with 4-nitro-41-amino-21-acetylamino-5<SP>1</SP>-methoxyazobenzene, diazotized on the material and developed with 1-di-(#-hydroxyethyl) - amino - 3 - acetylamino - benzene, and topped with the dyestuff 4-nitroaniline# N-di- (#-hydroxyethyl)-m-toluidine, is printed with an aqueous discharge paste containing Indanthrene golden yellow GK, Ponsol flavone GC; Ponsol jade green, sodium formaldehydesulphoxylate, sodium thiocyanate, gum tragacanth, sodium benzylsulphanilate and trisodium orthophosphate, and the print is dried, steamed, washed in a dilute aqueous solution of sodium hydroxide, oxidised in an aqueous solution at 50‹C. containing sodium perborate and soap, rinsed and dried to obtain an apple green pattern.on a dark brown ground ; (2) a mixed cellulose acetate-viscose fabric, dyed with a mixture of Cibacete discharge blue 3GN, 2:2<SP>1</SP> - dichloro - 6 - bromo - 4 - nitro - 4<SP>1</SP> - di - (hydroxyethyl) amino - azo - benzene, Celliton discharge yellow 3GN, Fastusol blue LB, chlorazol fast scarlet 4BS and Fastusol yellow -LRA, is printed with an aqueous discharge paste containing Indanthrene golden yellow GK, sodium formaldehydesulphoxylate, sodium thiocyanate, gum tragacanth, sodium benzylsulphanilate and trisodium orthophosphate and the print is dried, steamed, washed and oxidised as in (1) to obtain a yellow pattern on a dark brown ground ; (3) a cellulose acetate fabric, dyed with 4-nitro-41-amino-21- acetylamino - 5<SP>1</SP> - methoxy - azobenzene, diazotized on the material and developed with 1-di- (# - hydroxyethyl) - amino - 3 - acetylamino - benzene, is topped with a mixture of 2:2<SP>1</SP>- dichloro - 6 - bromo - 4 - nitro - 4<SP>1</SP> - di - (hydroxyethyl) amino-azo-benzene and Celliton discharge yellow 3GN and printed with an aqueous discharge paste containing Indanthrene golden yellow GK, Ponsol flavone GC, Ponsol jade green, sodium formaldehydesulphoxylate, sodium thiocyanate, sodium benzylsulphanilate and sodium silicate and the print is dried, steamed, washed and oxidized as in (1) to obtain a bright green pattern on a sepia brown ground ; (4) a cellulose acetate fabric dyed with a mixture of Celliton discharge blue 5G and Celliton discharge yellow 3GN is printed with an aqueous discharge paste containing Indanthrene scarlet B, sodium formaldehydesulphoxylate, sodium thiocyanate, gum tragacanth, sodium benzylsulphanilate and sodium sulphite and the print is dried, steamed, washed and oxidized as'in (1) to obtain a bright scarlet pattern on a bright green ground. The Specification as open to inspection under Sect. 91 comprises the similar production of discharge effects on textile materials in general. This subject-matter does not appear in the Specification as accepted.