GB1136105A - Method for improving the crease properties and setting of fabrics - Google Patents

Abstract

1,136,105. Treating fabrics. MOLNLYCKE A.B. 25 Jan., 1966 [26 Jan., 1965; 21 April, 1965], No. 3263/66. Heading D1P. A fabric is given improved dry and wet crease resistant properties and set or a permanent structure formed therein by impregnating it with an aqueous acid bath containing at least one nitrogen containing chemical, drying it at 40‹-130‹C, holding it for from 30 seconds to 48 hours at 0‹-100‹C without any movement of the fabric in such a way that the moisture content of the fabric during the holding time is 0.1-30% by weight based on the weight of the fabric, high dry and wet crease properties being obtained during this treatment, washing, neutralizing, rinsing and finishing it by starching or sizing, soaking it in an aqueous solution of a proton giving catalyst, numerous examples of which are given, drying it at a temperature below the setting temperature and heating at to 80‹-250‹ to effect setting. The nitrogen containing chemical is a condensation product of an aldehyde, e.g. formaldehyde or acetaldehyde, with a urea derivative having the formula in which R is oxygen or sulphur and R 1 and R 2 are H or together form the groups -CH 2 -CH 2 -, -CHOHCHOH- -CHR 3 -CHR 3 in which R 3 is methyl, ethyl, propyl, butyl or an oxyalkyl radical, -CH 2 -CHR 4 -CH 2 -, in which R 4 is H, OH, alkyl or oxyalkyl, -CH 2 -NR 5 -CH 2 - in which R 5 is H, OH, alkyl or oxyalkyl, -CH 2 - O-CH 2 - or the group or acetoguanamine, dicyandiamide, dicyandiamidine, a carbamate of the formula R 6 NH COOR 7 , R 6 being H, alkyl or aryl and R 7 being an alkyl or aryl radical, or melamime, free hydrogen atoms bonded to nitrogen atoms optionally being substituted by alkyl, oxyalkyl or aryl groups and free -OH groups optionally being transformed to alkoxy or aryloxy groups. Impregnation with the nitrogen-containing compound may be effected at 10‹-50‹C and the bath may also contain a nonionic surface active agent and an acrylic, methacrylic, vinyl acetate and/or polyvinyl alcohol resin and may have a pH of 1-6. Fabrics made from cotton, linen, viscose or cuprammonium rayon, silk, wool, regenerated protein, cellulose acetate, regenerated calcium alginate, polyamide, polyacrylic, polyester, polyvinyl chloride, polyurethane, polyethylene, polypropylene or polybutylene fibres may be treated. Cellulosic fabrics may be cross-linked with formaldehyde or polyoxymethylene prior to treatment with the nitrogen-containing chemical. After treatment with the proton giving catalyst and drying the fabric may be mechanically treated to impart creases, pleatings or stampings, embossed pressed or stretched prior to heat setting.