Patent GB-591594-A (GB)
Title: Improvements in the treatment of textile materials
IPC: D06M11/05
Filed: 1944-10-30
Abstract: 591,594. Proofing permeable materials. MELLOR, A., MANN, R. J., FINLAYSON, D., and HADFIELD, A. W. MORLEDGE-. Oct. 30, 1944, No. 21161. [Class 140] Moistened textile material of cellulose fibres is subjected to the action of a hydrophobe organic liquid or the vapour thereof until the cellulose fibres have a substantially uniform degree of transparency when immersed in the hydrophobe organic liquid. The material may be subsequently oiled. The textile material may be of cotton; regenerated cellulose ; saponified cellulose ester fibres, particularly those stretched prior to saponification, or the fabric of Specification 564,192, which contains these fibres. Water;to the extent of 22 per cent; or more, of the weight of the material may be applied by immersion followed by squeezing or centrifugal treatment, or it may be applied in mixture with a miscible liquid, and volatile miscible liquids so used may be evaporated off, to leave the material wetted. The hydrophobe organic liquid may be volatile, as benzene, toluene, xylene, solvent naphtha, light fractions of petroleum, carbon tetrachloride or perchlorethylene ; or non-volatile, as dimethyl, diethyl or di-(methoxyethyl) phthalate, 'or methylcyclohexanol, and these liquids can be used alone or when mixed with volatile hydrophobe liquids, or volatile watermiscible liquids such as acetone. Film-forming liquids such as tung or linseed oil or solutions of film-forming substances in volatile hydrophobe liquids may be used. The wetted textile material may be introduced directly into the hydrophobe liquid, or a pre-wetting liquid containing water and a common solvent, such as acetone, methylethylketone, methanol, ethanol, normal or isopropyl alcohol or diacetin, for the water and the hydrophobe liquid to be subsequently applied, may be used to wet the textile material, after which the hydrophobe liquid is applied. Clarification of the material can be effected by treatment with a mixture of water, the hydrophobe organic liquid and a volatile common solvent, the water and the volatile solvent being evaporated off. The material may be impregnated with a composition comprising a hydrophobe organic liquid, 10 to 15 per cent of water, a solid filmforming material such as a cellulose ester or ether, and a common solvent such as acetone. The material, when "clarified" by means of water and a volatile organic liquid may be dried before oiling. If the material, before oiling, is again wetted with water and dried, the finally oiled or treated product does not have a high degree of clarification, and pattern effects may be produced by applying water or an aqueous solution of methyl cellulose, gum arabic or gum tragacanth by printing or stencilling. Examples describe fabric of regenerated cellulose made by stretching and saponifying cellulose acetate filaments treated with (1) water and perchlorethylene by repeated immersion in each liquid alternately, after which the fabric is dried and oiled by passage through boiled linseed oil or linseed oil varnish, followed by a hot air drying process for the oil. to provide an " oiled silk " free from opaque filaments. (2) The fabric is immersed in aqueous acetone, drained and immersed in cold benzene until it appears clear, after which it is dried and immediately oiled. The benzene immersion may be omitted. (3) The fabric is doped with a mixture comprising cellulose acetate, acetone, di-(methoxyethyl) phthalate, cyclohexanol and water, and then dried. (4) After the acetone-water and benzene treatment of example (2), the fabric is dried, printed in a pattern with water thickened with watersoluble methyl cellulose, again dried and oiled with boiled linseed oil. The fabric is clear except for the printed portions, which exhibit opaque thread. Specification 591,593, [Group IV], also is referred to.