GB1098317A - Improvements in the treatment of cellulosic textile materials - Google Patents

Abstract

Cellulosic textile fabrics, e.g. cotton, linen and viscose rayon fabrics, are crease-proofed by impregnating them with an intermediate condensation product of a cross-linking resin which is an amido-formaldehyde condensation product which reacts chemically with cellulose to form cross-links, or the components thereof, together with sufficient of a suitable acidic catalyst to cure the cross-linking resin, drying the fabrics by heating in an atmosphere the temperature of which is not greater than 150 DEG C and then further heating the fabrics so that their temperature is between 100 DEG C and 160 DEG C for a maximum time of 12.5 seconds at 160 DEG C and which maximum is increased by a factor of two for every ten degrees reduction in temperature. The cross-linking resin may be dimethylol cyclicpropylene urea, dimethylol cyclic-ethylene urea, dimethylol glycol urein or dimethylol hydroxyethyl triazone and the catalyst may be zinc sulphate, chloride or nitrate. After impregnation the fabric may be dried in a stenter at 100 DEG -150 DEG C until it has a moisture content of 2-5% by weight and the resin then cured by heating the fabric by contact with heated cylinders, by radiant heat, by hot air heating using fans which blow hot air onto the fabric at high velocity or by hot air containing steam. The fabrics may also be treated with non-nitrogenous cross-linking agents, e.g. dichloropropahol or the disodium salt of tris-b -sulphatoethyl sulphonium inner salt. The process may be used to improve the permanence of mechanical effects, e.g. pleating and glazed effects, and stiff effects resulting from the use of starch, modified starch products and/or polyvinyl alcohol.