Patent GB-489235-A (GB)
Title: The production of resist effects illuminated with vat dyestuffs
IPC: D06P5/12
Filed: 1937-01-21
Abstract: Printing.-Resist effects coloured with vat dyes are obtained upon fabrics made of or containing cellulosic fibres by printing thereon a paste containing the vat dyestuff and an isocyanate of the general formula R-N = C = O wherein R is a saturated or unsaturated aliphatic hydrocarbon containing at least 8 carbon atoms, steaming the printed fabric and applying another dyestuff to colour the ground.  Such other dyestuff may be, for example, a vat dye (applied, if desired, in the form of the sulphuric ester of its leuco compound), an azoic dye or a mordant dye.  Specified isocyanates are those ranging from octyl to octodecyl, eikosyl, 2-ethylhexyl, 3-ethylnonyl and 9-octodecenyl and those obtainable from the mixed amines derived from the mixed acids obtained from coconut oil or stearin (cf. Specification 485,761).  They may be used in conjunction with other resist agents such as gelatin, glue size or other protein derivatives.  The following examples are specified: (1A) a cotton or viscose fabric is printed with an aqueous paste containing Flavanthrone, sodium formaldehydesulphoxylate, potassium carbonate, starch-British gum thickening, zinc oxide, heptadecyl isocyanate and sodium cetyl sulphate, dried, steamed at 100 DEG  C. for 5-20 minutes, nip-padded with an aqueous liquor containing the sulphuric ester of leuco-dimethoxybenzanthrone, tragacanth thickening and sodium nitrite, dried, passed through dilute sulphuric acid at 70 DEG C., washed and soaped to obtain a bright yellow pattern on a green ground; (1B) the dyestuff in the resist in (1A) is replaced by dimethoxydibenzanthrone, the zinc oxide being omitted, and the ground colour is replaced by the sulphuric ester of leuco-6 : 61-diethoxy-2 : 21-bis-thionaphtheneindigo to obtain a bright green pattern on an orange ground; (2A) and (2B) cotton fabrics printed, dried and steamed as in (1B) above with the use as dyestuffs of Flavanthrone, and 6 ; 6 - diethoxy - 2 : 21 - bisthionaphtheneindigo respectively are padded with an aqueous liquor containing dimethoxydibenzanthrone, sodium formaldehydesulphoxylate, potassium carbonate and tragacanth thickening, dried, steamed, oxidized and soaped to obtain bright yellow and orange patterns respectively on a green ground; (3A) and (3B) cotton fabrics are printed as in (1B) above with the use as dyestuffs of Flavanthrone and dimethoxydibenzanthrone respectively, dried and steamed and are padded with aqueous liquors containing sodium cetyl sulphate, caustic soda and tragacanth thickening and (3A) a diazoimino compound from 4-benzoylamino-2 : 5-diethoxyaniline and sarcosine (cf. Specification 320,324, [Class 15 (ii)]) and the anilide of 2 : 3-oxynaphthoic acid, (3B) a diazoimino compound from 4-chloro-2-aminotoluene and 2-amino-4-sulphobenzoic acid (cf. Specification 324,041, [Class 15 (ii)]) and the o-toluidide of 2 : 3-oxynaphthoic acid and the fabrics are again dried, steamed for 1/4 -\ba1/2 hour in presence of vapours of acetic and formic acids and soaped to obtain a bright yellow pattern on a blue ground and a bright green pattern on a pink ground respectively; (4) a cotton fabric is grounded with an aqueous solution containing the anilide of 2 : 3-oxynaphthoic acid, diacetone alcohol, caustic soda and sodium cetyl sulphate, dried, printed as in (2B), again dried, steamed for 5-10 minutes, padded with an aqueous preparation containing tragacanth thickening and tetrazotized dianisidine stabilized with zinc chloride, again dried, washed and soaped to obtain a bright orange pattern on a blue ground; (5) a cotton or viscose fabric is printed as in (1B), with the use as dyestuff of 6 : 61-dichloro-2 : 21-bisthionaphthenindigo, dried, steamed for 10 minutes, nip-padded with an aqueous preparation containing a -nitroso-b -naphthol, ferrous sulphate and tragacanth thickening, again dried, treated for 2 minutes with a boiling sodium carbonate solution, washed and soaped to obtain a bright pink pattern on a green ground; (6) a cotton fabric is printed as in (1B) with the use as dyestuff of 5 : 7 : 51 : 71-tetrabromindigo, dried, steamed for 10 minutes, nip-padded with an aqueous preparation containing 3-nitroalizarin, chromium acetate and tragacanth thickening, dried, steamed for 1/2 hour, washed and soaped to obtain a bright blue pattern on a brown ground; (7) a cotton fabric is padded with a sodium nitrite solution, dried, printed as in (2B), steamed for 5-10 minutes, padded with an aqueous preparation containing the sulphuric acid ester of leuco-16 : 17-diethylene ether of dihydroxydibenzanthrone and tragacanth thickening, dried, passed through dilute sulphuric acid at 70 DEG  C., washed and soaped to obtain a bright orange pattern on a blue ground; (8) a cotton fabric is printed and steamed as in (2B), padded with an aqueous preparation containing dimethoxydibenzanthrone, caustic soda, sodium hydrosulphite and tragacanth thickening, exposed to the air for 1/2 minute, oxidized and soaped to obtain a bright orange pattern on a green ground.  Specification 317,019, [Class 15 (ii)], also is referred to.