Finishing of polyamide fabrics

摘要

552,097. Fabrics comprising synthetic linear polyamide fibres. DU PONT DE NEMOURS & CO., E. I. Sept. 19, 1941, No. 12113. Convention date, Feb. 13. [Class 2 (ii)] The resilience and other properties of a fabric, e.g. of the woven, knit or felt type, comprising synthetic linear polyamide fibres, e.g. polyhexamethylene adipamide, are improved by heating the fabric at a temperature closely approaching the fusion temperature of the fibres by passing the fabric over a heated surface or between two heated surfaces under pressure. A heated metal surface and a fabric covered roller may be used or two rollers electrically heated and thermostatically controlled. The temperature may be between 5‹ and 25 ‹C. below the fusion point and the fabric may be uniformly moist with water and/ or other swellingagent. A short time only is necessary for the treatment. The polyamides are obtainable, e.g. by self-polymerization of monoaminomonocarboxylic acids or by reacting diamines with dibasic carboxylic acids in substantially equimolecular amounts. Instead of using amino acids, diamines or dibasic carboxylic acids the equivalent amide-forming derivatives thereof. may be used. The amino acid derivatives include the ester, amide, lactam, N-formyl derivatives, and when water is present, the nitrile. The diamine derivatives include the carbamates and the N-formyl and N: NSP1/SP- diformyl derivatives. The dibasic carboxylic acid derivatives include the diester, monoester, anhydride, amide, acid halide, and, when water is present, the mono- and dinitriles. With polyamide - forming reactants other linear polymer-forming reactants may be included, e.g. glycols, monohydroxymonocarboxylic acids and monoaminomonohydric alcohols. Polyamides mentioned are polyhexamethylene adipamide, polydecamethylene adipamide,polytetramethylene suberamide or sebacamide, polypentamethylene adipamide, polyhexamethylene sebacamide, polydecamethylene p - phenylene diacetamide, poly - p - xylene sebacamide, and 6-aminocaproic acid polymer. Modifying agents such as plasticizers, delustrants, pigments, extenders, fillers, dyes, resins, antioxidants, oils, and cellulose derivatives may be present.