GB317117A - Process for dressing artificial silk yarn - Google Patents

Abstract

317,117. Carpmael, A., (I. G. Farbenindustrie Akt.-Ges.). May 9, 1928. Yarns, treating with liquids.-Artificial silk yarn is dressed by treating it with a cellulose di- or poly-fatty acid or an alkali metal salt thereof or with a mixture of the acids or salts obtained by treating alkali cellulose prepared from cellulose or a conversion product thereof in the presence of caustic alkali with at least twice the proportion of a salt of a halogenated fatty acid necessary for the formation of the mono-substituted compound. In an example, cellulose is soaked in caustic alkali lye and after being pressed and finely divided is kneaded to a homogeneous mixture with sodium monochloracetate. On standing, a viscous pasty mass of the sodium salts of cellulose di- and poly-fatty acids is obtained, which on stirring with water first swells up and then forms a colloidal solution. The cellulose di- and poly-fatty acids are obtained in solution in a similar manner to glue. Thus, they are softened in water for some time at about 50‹ C. and worked up into a uniform magma. Water is then added to effect solution. A solution of the acids is obtained from a solution of the salts by acidifying with acetic acid. The solution should be filtered through a cloth before being used. In normal practice for dressing yarns, solutions containing from 1-2 per cent of the cellulose fatty acids are employed. The cellulose di- and poly-fatty acids or their alkali metal salts can be easily dissolved out of the treated materials by means of water, whether they are present alone or in combination with oil emulsions or with soap preparations. The materials are then ready for dyeing without any further preliminary treatment. When the warp for printed goods, which after weaving are not subjected to a wet process, is treated in this manner, the materials produced become more open and voluminous than the materials produced with dressed warp in the customary manner, since the film of cellulose fatty acid is removed mechanically during the weaving and subsequently dry finishing.