Patent GB-544544-A (GB)
Abstract: 544,544. Dyes and dyeing. COMPAGNIE NATIONALE DE MATIERES COLORANTES ET MANUFACTURES DE PRODUITS CHIMIQUES DU NORD REUNIES ETABLISSEMENTS KUHLMANN. April 23, 1940, No. 7290. Convention date, April 24. 1939. [Classes 2 (iii) and 15 (ii)] Dye preparations ; cellulose esters or ethers, dyeing; ; printing. Finely divided powders of water-insoluble dyestuffs containing primary, secondary or tertiary amino groups and/or phenolic groups are obtained by evaporating to dryness a paste containing a dispersing agent and a salt of the dyestuff with an acid or base and reducing the dried product to powder. These powders yield on dilution with water dispersions suitable for dyeing or sprinting cellulose ester or ether artificial silks. Specified dispersing agents are lignonesulphonic acids, water-soluble synthetic resins, condensation products of naphthalenesulphonic, phenolsulphonic or phenolcarboxylic acids with formaldehyde, alkylnaphthalenesulphonic acids, sulphonated mineral oils, sulphonated fats, products of the condensation of aldehydes with sulphonated mixtures of phenols with fats, waxes or resins, and dextrins. In examples, (1) an aqueous paste containing the dyestuff, 4-aminoacetanilide# phenol, caustic soda and a condensation product of naphthalenesulphonic acid with formaldehyde is evaporated to dryness and reduced to a powder ; this may be diluted with water and used to produce bright level greenish yellow prints on a dull cellulose acetate fabric ; (2) an aqueous paste containing the dyestuff, 4-aminotoluene- 2-sulphonanilide# diphenylamine, hydrochloric acid and the dispersing agent in (1) is evaporated to dryness at a temperature not above 60‹ C. and reduced to a powder ; this may be diluted witn water and used to dye cellulose acetate artificial silk yellow ; (3) an aqueous paste containing the dyestuff, 41-nitro-4-aminoazo-benzene, hydrochloric acid and the dispersing agent in (1) is evaporated to dryness as in (2) and reduced to a powder ; this may be diluted with water and used to produce bright level orange prints ; (4) an aqueous paste containing the dyestuff, 4-nitroaniline# cresidine, hydrochloric acid and the dispersing agent of (1) is evaporated to dryness as in (2) and reduced to a powder ; this may be diluted with water and used to dye cellulose acetate artificial silk a level bright scarlet ; (5) an aqueous paste containing the dyestuff, 4-nitioaniline# dimethylaniline, hydrochloric acid and sodium dibutynaphthalenesulphonate is evaporated to dryness as in (2) and reduced to powder ; this may be used in aqueous solution to dye cellulose acetate artificial silk a bright, level, pure red, fast to rubbing ; (6) an aqueous paste containing the dyestuff, 4-nitroaniline# N-methyl-N-#-hydroxyethyl-aniline, oxalic acid and the dispersing agent of (5) is evaporated to dryness as in (2) and reduced to powder ; this may be diluted with water and used to dye cellulose acetate artificial silk a bright scarlet fast to rubbing ; (7) an aqueous paste containing the dvestuff obtained by reducing the nitro group of 4-nitroaniline# 1-naphthylamine, oleic acid and the dispersing agent of (5) is slowly evaporated to dryness and reduced to powder; this may be diluted with water and used to dye cellulose acetate artificial silk orange and the dyeings may be diazotized and developed with 2 3-hydroxynaphthoic acid to a deep black, fast to light ; (8) an aqueous paste containing 1 : 4 : 5 : 8-tetraaminoanthraquinone, hydrochloric acid and the dispersing agent of (1) is evaporated to dryness, reduced to powder, and the powder mixed with anhydrous sodium carbonate ; the product gives an aqueous emulsion suitable for printing a matt cellulose acetate artificial silk fabric in level light blue shades ; (11) an aqueous paste containing the dyestuff, 4-amino- 4<SP>1</SP> - N - methyl - N - # hydroxyethyl - amino - azo-benzene or the corresponding N-di-(#- hydroxyethyl)-amino or N-# : y : dihydroxypropyl-amino-compound, sodium sulphoacetate and lignonesulphonic acid is evaporated to dryness and reduced to powder ; this may be used to dye cellulose acetate artificial silk yellow and the dyeings may be diazotized and developed with 2 : 3-hydroxynaphthoic acid to a level black, fast to light and to sublimation. Examples (9) and (10) exemplify the process of dyeing at 50-60‹ C. and the printing process respectively for cellulose acetate artificial silk. Specification 421,802 is referred to. The Specification as open to inspection - under Sect. 91 comprises also an example of the dyeing process wherein a mixture of the dyestuff dispersions obtained in examples (1) and (5) above is used. This subject-matter does not appear in the Specification as accepted.