Patent GB-534271-A (GB)
Title: Printing of textiles
IPC: D06P1/12
Filed: 1939-08-29
Abstract: 534,271. Dyeing textiles. DU PONT DE NEMOURS & CO., E. I. Aug. 29, 1939, No. 24769. Convention date, Aug. 31, 1938. [Class 15 (ii)] Azo dyes, forming on the material ; printing.- In the production of an ice colour print on a fabric, the coupling component is first applied, the fabric is then printed with an aqueous paste containing a dissolved aryl-diazoamino (including diazoimino) compound and a thickener with addition of an acid below 20‹C. and adjustment, if necessary, of the acidity to a value suitable for coupling the diazo salt being wholly or partly regenerated, and the printed fabric is, advantageously, heated to fix the colour. Specified buffer compounds for adjusting the acidity are sodium formate and acetate, aluminium and magnesium sulphates, zinc oxide and alkali metal borates. The solvent for the aryl-diazoamino compound may be, for example, water, methyl, ethyl or isopropyl alcohol, ethylene or propylene glycol, ethylene glycol monomethyl, monoethyl or monobutyl ether, diethylene glycol or its monoethers, glycerol, dioxane, methyl acetate or acetone. Specified coupling components are arylamides of 2:3- hydroxynaphthoic, 2:3-hydroxycarbazolecarboxylic, 51 - hydroxy - (1 : 2 - benzcarbazole) - carboxylic, 2:3-hydroxyanthracene - carboxylic, acetoacetic, benzoylacetic and terephthalolylbis-acetic acids, 1- and 2-naphthols, aminonaphthols, acylaminonaphthols, 4-arylazo-1- acyl amino - 7 - naphthols, dihydroxy quinolines and arylalkylpyrazolones. Specified diazo components are 3-chloroaniline, 2:5- dichloroaniline, 4 - chloro - 2 - aminotoluene, 4 - chloro - 2 - aminoanisole, 4 - nitroaniline, 4 - aminoanisole, 3 - nitro-, 4 - and 5 - nitro - 2 - aminoanisoles, dianisidine, 2:5 - dimethoxyaniline, 1 - and 2 - naphthylamines, 4 - benzoylamino - 2 : 5 - diethoxyaniline, 4 - carbomethoxyamino - 2 : 5 - diethoxyaniline, o - aminoazotoluene, 3 - aminocarbazole and 4 - amino - 4<SP>1</SP>- methoxydiphenylamine. Specified stabilizing components of the diazoamino compounds are diethanolamine, di-(#-hydroxyn-propyl)-amine, methylglucamine, piperidine- α-carboxylic acid, 4-sulpho-2-aminobenzoic acid, 2-aminotoluene-4-sulphonic acid, sarcosine and dimethylamine. Specified acids for use in converting the diazoamino compound into its components are acetic, formic, glycollic, chloroacetic, trichloroacetic, citric, tartaric, oxalic, lactic, gluconic, maleic, sulphamic, benzenesulphonic, p-toluenesulphonic, phenylphosphinic, aniline- 2:5-disulphonic, hydrochloric, sulphuric and phosphoric acids. Acid salts such as aluminium sulphate and potassium bisulphate may also be used. In examples of the printing of cotton piece goods (1) the goods are impregnated with an aqueous preparation containing the anilide of 2:3-hydroxynaphthoic acid, caustic soda and turkey red oil, dried, printed with an aqueous paste made by dissolving the diazoamino compound from 2:5-dichloroaniline and diethanolamine in ethylene glycol monoethyl ether, adding conc. hydrochloric acid, and allowing to stand for 30 minutes at below 20‹C., adding water and an aqueous thickening comprising wheat starch, gum tragacanth and glycerol and adding sodium acetate solution to adjust the pH value; the printed goods are dried, soaped, rinsed and dried to obtain a brilliant scarlet pattern; (2) the goods, impregnated as in (1), are similarly printed a brilliant red with the use of a solution in ethyl alcohol of the diazoamino compound from 4- chloro-2-aminotoluene and diethanolamine with addition of glacial acetic acid and allowing to stand for 20 minutes at below 20‹C. ; (3) the goods, impregnated with the 2<SP>1</SP>-toluidide of 2:3-hydroxynaphthoic acid, are printed as in (2) to obtain a bright red pattern ; (4) the goods, impregnated with the 2<SP>1</SP>-phenetidide of 2:3-hydroxynaphthoic acid, are printed as in (2) to obtain a brilliant scarlet pattern ; (5) the goods, impregnated with the 2'-naphthylamide of 2:3-hydroxynaphthoic acid, are similarly printed a bright red with a solution in ethyl alcohol of the diazoamino compound in (2) with addition of p-toluenesulphonic, aniline - 2 : 5 - disulphonic or citric acid or aluminium sulphate and allowing to stand for 30 minutes at below 20‹C. ; (6) the goods, impregnated with diacetoacetyltolidine, are printed as in (3) to obtain a brilliant yellow pattern ; (7) the goods, impregnated with 1-acetylamino-4-(31- nitrobenzene-azo) -7 - naphthol, are printed as in (3) to obtain a dull red-brown pattern; (8) the goods, impregnated as in (1), are similarly printed a bright yellowish red pattern with the use of the diazoamino compound from 4-nitro-2-aminoanisole and α-piperidinecarboxylic acid to obtain a bright yellowish red pattern ; (9) the goods, impregnated as in (3), are printed as in (8) to obtain a bright red pattern; (10) the goods, impregnated with the 3<SP>1</SP>-nitranil.ide of 2:3-hydroxynaphthoic acid, are printed as in (8) to obtain a bright bluish red pattern; (11) the goods, impregnated as in (1), are similarly printed a reddish blue with the use of a solution in aqueous ethyl alcohol of the diazoamino compound from dianisidine and methylglucamine with addition of glacial acetic acid and allowing to stand for 20 minutes at below 20‹C. ; (12) the goods, impregnated as in (4), are printed as in (11) to obtain a blue pattern; (13) the goods, impregnated as in (7), are printed as in (11) to obtain a dull black pattern; (14) the goods, impregnated as in (6) are printed as in (11) to obtain a golden yellow pattern; (15) the goods, impregnated with the 4<SP>1</SP>-chloroanilide of 2:3- hydroxyanthracene carboxylic acid, are printed as in (11) to obtain a dull bluish green pattern. A table is also given showing the shades obtainable with numerous other combinations of components. Reference has been directed by the Comptroller to Specification 481,747.