GB318255A - Manufacture of cellulose derivatives - Google Patents

Abstract

318,255. Soc. of Chemical Industry in Basle. Aug. 31, 1928, [Convention date]. Yarns, treating with liquids.-Basic ethers of cellulose are prepared by treating alkali compounds of cellulose with halogenalkyl amines or their alkyl, aryl, or aralkyl substitution products; salts of the amines may also be used, particularly when the alkali cellulose contains an excess of alkali. The amines or their salts may be used in solution in water, acetone, or other solvent, and the reaction may occur at ordinary or raised temperature. The cellulose may be taken as wood pulp, regenerated cellulose, or paper, or as cotton in loose form, in skeins, or in the web. The reagents may be brought together in various proportions. The products are readily dyed with acid dyes and show an enhanced affinity for other dyes, and accordingly cotton fabrics may be impregnated, either under tension or not, with a halogenalkyl amine and, after drying, printed with a strongly alkaline thickening agent; on treatment with an acid dye, the printed parts are strongly dyed. The basic ethers may also be acylated, for instance with acetic anhydride, acetyl chloride, or toluene sulphochloride, or they may The further alkylated, arylated, or aralkylated, the products in any event being suitable for making artificial threads. The basic ethers mav also be dissolved in the known solvents for cellulose, or in the form of xanthate, and regenerated by known methods in the form of films or fibres, or they may be added to ordinary solutions of cellulose. According to the examples, (1) mercerized cotton yarn is treated with an acetone solution of chlorethyldiethylamine; washed, and dried; (2) cotton yarn mercerized under tension is treated, under tension or not, with an aqueous acetone solution of chlorethyldiethylamine hydrochloride at 50-60‹ C., washed and dried; the product is readily dyed with acid dyes such as Tartrazine; (3) cotton fabric is impregnated with chlorethyldiethylamine hydrochloride solution, dried, printed with a strongly alkaline thickener, dried, and dyed with a red acid dye; (4) viscose silk is treated as in (1); (5) loose cotton is treated with caustic soda lye, pressed, treated with chlorethylethylaniline solution, and washed; (6) loose cotton is converted to soda cellulose and treated with chlorethyldiethylamine hydrochloride; (7) wood pulp is impregnated'with caustic soda lye, pressed, and treated with chlorethyldiethylamine solution at 60‹ C. ; (8) the product of (6) is dissolved in ammoniacal-copper solution and precipitated in known manner; (9) the product of (6) is dissolved by treatment with caustic soda lye and carbon bisulphide, and further worked in known manner; (10) diethylaminoethyl cellulose is heated with acetic acid and acetic anhydride in the presence of zinc chloride until solution occurs, and the product is precipitated with water and worked up; (11) an ammoniacal-copper'solution containing cellulose and diethylaminoethyl cellulose is prepared and spun by a known method; (12) yarn treated as in (1) is dyed with an acid dye in the presence of acetic or sulphuric acid; (13) yarn treated as in (1) is dyed with a direct dye in a neutral bath; (14) cotton treated as described above is printed in known manner with an acid or a direct dye.