GB543783A - Treating coloured cellulosic textile materials - Google Patents

Abstract

543,783. Dyeing textiles. DUNBAR, C., EVANS, J. G., WARD, D., and IMPERIAL CHEMICAL INDUSTRIES, Ltd. Sept. 11, 1940, No. 14077. [Classes 2 (iii) and 15 (ii)] The fastness to water of dyeings with direct dyes on cellulosic textile materials is improved by treating the dyed materials with a watersoluble condensation product, obtainable as . described in Specification 207,499, [Class 2 (iii)], from hexamethylenetetramine and an alkyl, hydroxyalkyl or alkenyl halide containing not more than 4 carbon atoms. Alternatively the treatment may be with a salt of such a condensation product. The fastness to washing is improved by a simultaneous treatment with formaldehyde or a substance yielding formaldehyde, in which case the materials are dried at a raised temperature. Specified halides for condensation with the hexamethylenetetramine are methyl, ethyl, propyl, isopropyl, butyl, isobutyl and allyl chlorides and ethylene chlorohydrin. In examples,(1) cotton limbric, dyed with Chlorazol fast orange RS, is treated for 20 minutes with an aqueous solution at 33‹C: containing 0.025 per cent of the condensation product, neutralized with hydrochloric acid, from hexamethylenetetramine and ethyl chloride; rinsed and dried ; (2) cotton limbric, dyed with Chlorazol fast helio 2RKS, is treated for 20 minutes with a similar aqueous solution at 20‹C., rinsed and dried in hot air ; (3) and (4) spun viscose and cotton limbric materials, dyed with Chlorazol fast red KS, are treated as in (1) ; (5) and (6) cotton'limbric, dyed with Chlorazol fast helio 2RHS, is padded with an aqueous solution at 10‹C. containing 1 per cent of the condensation product, neutralized or not with hydrochloric acid, from hexamethylenetetramine and ethyl chloride, and dried; (7) cotton limbric dyed with Chlorazol fast red RS is padded with an aqueous solution at 10‹C. containing formaldehyde and 2 per cent of the condensation product, neutralized with hydrochloric acid, from hexamethylenetetramine and ethyl chloride, dried at 40‹C., heated for 5 minutes at 150‹C., cooled, rinsed with dilute aqueous ammonia, rinsed and dried at 105‹C.; (8), (9), (10), (11) cotton limbric, dyed with Chlorazol fast helio 2RKS, is treated as in (1) with replacement of the ethyl chloride by (8) butyl iodide, (9) propyl bromide, (10) allyl chloride, (11) ethylene chlorohydrin.