Patent GB-444181-A (GB)
Title: Improvements in or relating to the manufacture and treatment of artificial filaments, yarns, fabrics and like materials
IPC: D01F2/28
Filed: 1934-09-11
Abstract: Artificial filaments, yarns, fabrics, and other materials having a basis of cellulose acetate or other organic derivative of cellulose are subjected to treatment for incorporation of loading, delustring, or similar agents, and also of water-insoluble salts derived from organic compounds of high molecular weight which contain acidic groups.  The artificial materials may have a basis of cellulose acetate, propionate, butyrate, or other ester, or methyl, benzyl, or other ether of cellulose, or a mixed ester or ether ester of cellulose. Insoluble salts of high fatty acids, naphthenic acids, and resins containing acidic groups, are specified.  Salts of lead, barium, strontium, magnesium, lithium, calcium, aluminium, and zinc, with colophony, glyptal resins, or other natural or synthetic resin containing acid groups, or with palmitic, stearic, lauric, or myristic acid may be used.  Materials weighted with aluminium silicate may be treated with sodium laurate and then with barium chloride.  The materials may be padded first with a solution of sodium silicate and a salt of a resin or higher fatty acid and p then with barium chloride, or silica may be precipitated by treatment with an acid gas such as hydrogen chloride and the insoluble resin salt may be precipitated by treatment with magnesium sulphate.  The yarns may be treated with a solution of a weak acid salt such as sodium borate and with a salt of a higher fatty acid and then with a precipitating agent such as barium acetate.  Filaments of cellulose esters may be saponified during the loading treatment.  Incorporation of the insoluble compounds may be assisted by the use of swelling agents or wetting agents. The treatment may be carried out at raised temperature and pressure.  Yarns may be treated in hanks or other package form, or while travelling singly or in warp form.  Yarns which have undergone twisting, stretching, or shrinking, may be treated.  In an example, hanks of cellulose acetate yarn are immersed in sodium silicate and sodium colophonate, excess liquor is removed, the hanks are dried, immersed in aluminium acetate solution, centrifuged, rinsed, and dried.  In another example, cellulose acetate fabric is immersed in a mixture of sodium silicate and laurate, dried, immersed in a solution of barium chloride and acetic acid, washed and dried.  In another example, cellulose acetate yarns in parallel formation are passed through a solution of aluminium acetate and then through a solution of sodium silicate containing a small amount of sodium naphthenate. Specifications 258,874, 280,094, 281,084, [all in Class 42 (i)], 343,949, 389,823, 411,094, 437,019, 438,584, 438,585, 438,586, 438,587, 438,590, 438,591, 438,655, 438,656, 443,725, 443,726, and 443,773 are referred to.  The Provisional Specification describes also the incorporation of water-insoluble resins themselves as additional substances. Cellulose acetate filaments containing a loading agent may be treated with a benzene solution of ester gum or an alcoholic solution of a phenolaldehyde resin.  The application of the process to mordanting treatments is referred to.  The artificial materials may be of regenerated cellulose obtained from viscose.