GB450516A - Improvements in the treatment of cellulosic textile materials - Google Patents

Abstract

Pattern effects are obtained upon a textile material by locally impregnating it with a synthetic resin produced by reaction on the material between an aliphatic or aromatic amine or amide or derivative thereof (other than a partial condensation product with an aldehyde) and an aldehyde applied thereto together or separately and applying a dyestuff locally or otherwise after the application of such reagents. The dyestuff may have affinity for either the impregnated or non-impregnated material. Specified amines, amides and derivatives thereof are urea, thiourea, guanidine, dicyandiamide, aniline, methylaniline, diphenylamine, benzylaniline, b -naphthylamine and aromatic sulphonamides, e.g. p-toluenesulphonamide and their N-alkyl derivatives and specified aldehydes are formaldehyde, acetaldehyde and benzaldehyde. The textile materials may be of cellulosic fibres, e.g. cotton, linen, jute, ramie or artificial silks of the viscose, cuprammonium or nitrocellulose types or may be of cellulose esters or ethers or of natural silk or other animal fibres. The following examples are specified. (1) A fibre or fabric of cellulose or cellulose derivative is printed or otherwise locally impregnated with a mixture of thiourea, formaldehyde, formic acid and water, dried for 1--2 hours at 80 DEG C. until a condensation product insoluble in boiling water is formed, and, in the case of a cellulosic material, dyed with a direct dyestuff with addition to the bath of the usual assistants, e.g. sodium sulphate or a wetting agent such as a sulphonated higher fatty alcohol; the untreated areas are coloured, while the treated areas remain white; in the case of either a cellulosic or a cellulose derivative material, if an acid dyestuff without affinity for cotton is used, the treated areas are coloured, while the untreated areas remain white and if a basic dyestuff is used the treated areas are more deeply coloured than the untreated areas; plasticizers or softeners such as glycerine, oils or sulphonated fatty oils may be present in the resin-forming mixture, also latex or other agent for increasing the fixation. (2) A similar fibre or fabric is printed or otherwise locally impregnated with a mixture of dicyandiamide, ammonium sulphocyanide and 40 per cent formaldehyde and dyed as in (1). (3) A similar fibre or fabric is printed or otherwise locally impregnated with a mixture of urea, dicyandiamide, glycerine, an alkaline or alkaline earth sulphocyanide and 40 per cent formaldehyde and dyed as in (1). Further effects are obtainable if the fabrics contain also silk, wool, or other animal fibres. Lists are given of suitable direct, acid and basic dyestuffs. According to the Provisional Specification the aldehydes may be replaced by ketones.