GB434858A - Improvements in the manufacture of artificial staple fibres - Google Patents

Abstract

A process for the production of staple fibres or yarn spun therefrom comprises the steps of forming continuous artificial filaments, threads, yarns or like materials from spinning solutions having a basis of organic derivatives of cellulose and containing wax-like compounds which are formed by reaction between higher fatty acids such as stearic palmitic or oleic acid and di- or polyhydric alcohols, alkylolamines or ammonia and which are readily dispersible in aqueous media, converting such continuous artificial filaments, threads, yarns and like materials into staple fibres and crinkling and delustring the materials by treatment with hot aqueous media. The treatment with hot aqueous media must be more vigorous, e.g. at a higher temperature, than for mere delustring. The wax-like compounds may be used alone or in combination with other substances, e.g. cresylic acid, butyl acetate, polymerized fatty acids, glycero-boric acid, glycoboric acid, cetyl alcohol or esters or ethers of higher fatty alcohols. The compounds may be employed in proportions of 1--20 per cent, but preferably of 3--7 per cent of the cellulose derivative; depending on the compound employed and its solubility in the spinning solution. The spinning solution may, if necessary, be filtered at a raised temperature. The spinning solution may also contain ceresin wax, beeswax, stearic acid, palmitic acid, ozokerite wax, carnauba wax, chlorinated naphthalenes, and like substances which are not readily emulsifiable in water or soap solutions. In an example diethylene glycol stearate is dissolved in heated acetone, and added to a solution of cellulose acetate in p acetone to form a solution containing 5 per cent of the stearate based on the weight of cellulose acetate. The solution is dry spun to form filaments which are crinkled by treatment in 0,2 per cent aqueous soap solution at 95 DEG C. for 30 minutes and then stapled. In the above example diethylene glycol oleate, glycerol di-stearate or a mixture of equal parts of diethylene glycol stearate and triethanolamine stearate may replace the diethylene glycol stearate.