PROCESS FOR FELT-PROOFING AND DIMENSIONALLY STABILISING TEXTILES MADE OF FIBRES WHICH CONTAIN KERATIN

摘要

1403297 Shrinkproofing wool BAYER AG 31 Aug 1973 [1 Sept 1972] 41005/73 Heading DIP Keratinous fibre fabrics are shrink-and feltproofed by treating with an aqueous bath containing a salt of sulphurous acid or a pyrosulphite as a reducing agent and a polyurethane which contains onium groups. The reducing agent may be sodium or potassium sulphite, bisulphite or pyrosulphite, ammonium sulphite, hydrazine sulphite, methyl hydrazine sulphite and salts of ethylamine, propylamine, monoethylolamine, diethanolamine, triethanolamine, ethylenediamine, tetramethylethylenediamine, triethylenediamine, fully methylated diethylenetriamine or hexamethylenediamine, or ammonium or amine salts of sodium bisulphite. The modified polyurethane may be formed by ternising sulphides or quaternising amines with polyaddition products containing active halogen. The latter products may be formed by reacting a polyisocyanate with a polydroxyl compound to form a compound containing free isocyanate groups and then reacting with a halogenated acid or amide. Specified hydroxyl group-containing compounds used in the formation of the prepolymer include polythioethers, polyesters, polyesteramides, polyamides, polyethers, amino group containing polyethers, polyoxylated amines, amino group-containing polyesters or polythioesters, 'onium' nitrogen containing compounds, urethane or urea-group containing polyols, natural carbohydrates or hydroxy carboxylic acids such as castor oil. The isocyanate used to form the polyurethane may be tetramethylene diisocyanate, hexamethylene diisocyanate, cyclohexane diisocyanate, dicyclohexylmethane diisocyanate, hexahydrotolylene diisocyanate, xylene diisocyanate, sulphur-containing diisocyanates, triisocyanates and aromatic polyisocyanates. Ethoxy alkyl phenols, fatty alcohols and fatty acids may be used to emulsify the polyaddition products. The aqueous treating liquid may also contain buffers, e.g. acetate, bicarbonate, carbonate, borax or phosphates, swelling agents e.g. urea, dicyandiamide, formamide, dimethyl formamide, dimethylacetamide, methanol, ethanol or isopropanol, plasticisers and perfluoroalkyl stain resisting compounds. The treated fabric may be steamed and dried synthetic or cellulose fibres may be present in the fabric.