GB524897A - Improvements in or relating to the manufacture and treatment of artificial textile materials - Google Patents

Abstract

524,897. Artificial silk &c. HILL, F. B., and JACKSON, T. Feb. 10, 1939, No. 4407. [Class 2 (ii)] Textile materials having a basis of a cellulose derivative are subjected, in the absence of tension sufficient to stretch them, to the action of a medium comprising a shrinking agent which is a non-associated substance and a small proportion of a carboxylic acid or an ester thereof. The treatment results in increased extensibility or in the case of woven or other fabrics, shrinkage effects are produced. The shrinking agent may be methylene chloride or other halogenated hydrocarbon which is a latent solvent and it may be diluted with an aliphatic or aromatic hydrocarbon e.g. benzine, petrol ether, kerosene, benzene, toluene, or xylene, or with carbon tetrachloride. The additional agent may be an aliphatic or aromatic carboxylic acid or an ester e.g. acetic, formic, glycollic, lactic, succinic, tartaric, or citric acid, or benzoic or salicylic acid, or glycol mono or diacetate, dibutyl tartrate, alkyl or ketonyl phthalates, or the ethyl ether of glycol monoacetate. The additional agent may be present in a proportion of less than one per cent. Filaments, threads, yarns, fabrics, or fibres containing or derived from high tenacity filaments which have been stretched in steam or hot water, may be subjected to the treatment. Preferably the materials are allowed to shrink during the treatment. Staple fibres acquire a crinkle or crimped effect. The materials may be made of cellulose acetate, acetobutyrate, or other ester or methyl, ethyl, benzyl cellulose or other cellulose ether. In an example, dry spun cellulose acetate yarn which has been stretched in wet steam is immersed in hank form in a bath of 65 per cent. methylene chloride and 35 per cent. kerosene containing 2.5 cc./litre of glacial acetic acid, and allowed to shrink freely. It is washed with petroleum ether and dried. Specifications 380,504, 389,823 and 523,425, are referred to.