GB380860A - Improvements in or relating to textile printing by means of vat dyestuff preparations - Google Patents

Abstract

In printing textiles (including cotton, wool, silk, and artificial silks such as cellulose acetate silk) with vat dyes, preparations containing the vat dye and a substituted or unsubstituted anthraquinone sulphonic or carboxylic acid or salt thereof, or a reduction product of the same still containing oxygen in the ms-position, are employed. Anthraquinone, a hydroxyanthraquinone, an aminoanthraquinone or a reduction product thereof still containing oxygen in the ms-position, or a mixture of compounds of these types may also be added to the dyestuff preparations or printing pastes. The manufacture of the dyestuff preparations and printing pastes is carried out in the manner described in Specifications 349,955 and 350,963. In examples (1) 6 : 6<1>-diethoxythioindigo, or the dyestuff described in example (1) of Specification 15607/07, [Class 2, Acids and salts, Organic &c.], is made into a printing paste with glycerine, potassium anthraquinone-1-sulphonate (which may be replaced by the sodium salts of anthraquinone-2-sulphonic acid or of anthraquinone-2 : 6-, -2 : 7-, -1 : 5-, or -1 : 8-disulphonic acids), starch, British gum, tragacanth, potassium carbonate, and sodium formaldehyde-sulphoxylate, printed on cotton, steamed, and developed with potassium bichromate-acetic acid, (2) 3 : 4 : 8 : 9-dibenzpyrene-5 : 10-quinone or dichlorisoviolanthrone are made into printing pastes as described in example (1) with addition of anthraquinone-2-carboxylic acid, (3) di-p-anisoyl-1 : 5-diamino-4 : 8-dioxyanthraquinone is made into a printing paste with 2 : 6-dioxyanthraquinone-3 : 7-disulphonic acid (made by sulphonating anthraflavic acid with oleum), (4) a paste containing 6 : 6<1>-diethoxythioindigo, or 6 : 6<1>-dichlor-4 : 4 4<1>-dimethylthioindigo, glycerine, and potassium anthraquinone-1-sulphonate is reduced by means of ammonia and hydrosulphite, with or without the addition of a hydrotropic agent, such as sodium benzenesulphonate; the resulting paste may be used for printing or sloppadding, and (5) a paste containing 6 : 6<1>-dichlor-4 : 4<1>-dimethylthioindigo, sodium dimethylsulphanilate, glycerine, 2 : 6-dioxyanthraquinone-3 : 7-disulphonic acid (or anthraquinone-2-carboxylic acid) is mixed with the thickening materials specified in example (1), printed on cotton and developed. Specifications 27742/08, [Class 15, Bleaching &c.], and 3241/11, [Class 2 (iii), Dyes &c.], also are referred to.