US2082814A - Process of making a substitute for wool from viscose - Google Patents

Description

Patented June 8, 1937. I v

UNITED STATES PATENT OFFICE PROCESS OF MAKING A SUBSTITUTE FOR WOOL FROM VISCOSE Walther Zetzsche and Hermann Faber, Premnitz, Germany, assignors to I. G. Farbenindustrie Aktiengesellschaft, Frankfort on the Main. Germany No Drawing. Application November 29, 1935, Serial No. 52,201. In Germany November 30,

Claims. (01. 18-54) Our present invention relates to the manufacare at the same time desulfurized, so that septure of a substitute for W001 from viscose. arate desulfurizing is not necessary in this case. One of its objects is a process of making an The following is an example of the invention: improved substitute for W001 from viscose. An- Viscose is spun from a nozzle having 800 per- 5 other object is a process of making well crimped forations at 25 C. in a solution of ammonium staple fiber from viscose. Further objects'will sulfate of 30 per cent. strength; all the fiber be seen from the detailed specification following bundles thus produced are united in a spinning hereafter. machine to form thick bundles ofseveral 1000 According to the invention well crimped celdeniers. These bundles are now out to staples lulose artificial fibers are obtained by cutting ce'land introduced into glycerin heated to 120 C. 10 lulose xanthate into staple threads and treating From the heated glycerin the crimped fibers are these with heated'liquids to convert them into separated by means of conveyer sieves running cellulose threads. It is preferable to stretch the over rollers or by any other known device. It xanthate threads in the coagulation bath or beis then freed, by washing with water, from the tween the coagulation bath and the cutting maadhering glycerin and treated with solutions of 15 chine. Any known device may be used for the scaping agents or brightening agents. The fibers stretching, for example rollers driven at difierthus made are dried and combed to produce a ent speeds, or rods set in staggered relationship loose staple fiber sliver. The thread is thoroughin the path of the thread and thus cause the ly crimped, in which respect it approximates wool latter to change its direction. Also the stretchvery closely. 20

ing may be produced by use of a draft speed ex- Instead of the glycerin heated at 120 C. a ceeding considerably the speed of expression of,' concentrated solution of sodium sulfate boiling at the xanthate. Spinning baths suitable for makabout 103 C. may be used. The decomposition ing the cellulose xanthate threadsare ammonium needs a little more time in view of the lower temsulfate solutions, with or without sodium sulfate. perature. 25

As decomposing liquids glycerin, glycol, sulfo- What we claim is: nated :oii, such as sulfonated olive oil or castor 1. A p ocess of making a ubsti ute for W001 oil are suitable. There may also be used aqueous which comprises squirting viscose into a precipisolutions of high boiling point of inorganic salts, tating bath capable of precipitating the viscose such as a calcium chloride solution, or a conin the form of cellulose xanthogenate, assembling 30 centrated solution of sodium sulfate which has the spun th a s to a h k fi r b cutting proved to be well adapted, aqueous solutions of the fiber band into staples, and converting the organic acids, such as oxalic acid, alcohols of cellulose xanthogenate into cellulose hydrate by high boiling point, ethers of the hydroaromatic, means of a liquid heated at 60 to 50 C.

aromatic and aliphatic series, ketones of high 2- A Process f m kin a substitute for wool 35 boiling point, such as cyclohexanone and their which comprises squirting viscose into a'precipisubstitution products. The decomposition of the tating bath capable of precipitating the viscose xanthate threads in a decomposing bath occuin the form of cellulose xanthogenate, assembling pies a few seconds up to a few minutes in ac the spun threads to a thick fiber band, cutting 40 cordance with the temperature selected. The the fiber band into staples, nd converting the 40 temperature mayvary between about and 150 cellulose xanthogenate into cellulose hydrate by C., and is preferably to C. It is also means of a liquid heated at 120 to 130 C. possible to decompose the threads at a temper 3. A process of making a substitute for W001 ature lower than 60, however, the treatment lasts which comprises squirting viscose into a precipi- 45 too long for practical purposes. After the de-- tating bath capable of precipitating the viscose 45 composition the threads are separated from the in the form of cellulose xanthogenate, assembling decomposition liquid and freed by washing with the spun threads to'a; thick fiber band, cutting water from the adhering chemicals, particularly the fiber band into staples, and converting the the adhering decomposition liquid. From the cellulose xanthogenate 'into cellulose hydrate by washing liquid the substance used for decomposmeans of a liquid having a desulfurizing action 50 ing the xanthate may be recovered by evaporaheated at 60 to C. tion. 4. A process of making a substitute for wool If glycerin, glycol, sulfonated oil, as well as which comprises squirting viscose into a precipiorganic liquids which dissolve sulfur are used tating bath capable of precipitating the viscose 5 for decomposing the xanthate fibers, the fibers in the form of cellulose xanthogenate, assembling 5 the spun threads to a thick fiber band, cutting the fiber band into staples, and converting the cellulosexanthogenate into cellulose hydrate by means of glycerine heated at 120 C.

5. A process of making a substitute for wool which comprises Squirting viscose into a precipitating bath capable of precipitating the viscose in the form of cellulose xanthogenate, as-

sembling the spun threads to a; thick fiber band, cutting the fiber band into staples, and converting the cellulose xanthogenate into cellulose hydrate by means of a boiling salt solution.

WALTHER ZETZSCHE. HERMANN' FABER.