US2025025A

US2025025A - Hydrocaoutchouc yarn

Info

Publication number: US2025025A
Application number: US744199A
Authority: US
Inventors: Thomas H Byron
Original assignee: North American Rayon Corp
Current assignee: North American Rayon Corp
Priority date: 1934-09-15
Filing date: 1934-09-15
Publication date: 1935-12-24
Anticipated expiration: 1952-12-24

Description

Patented Dec. 24, 1935 UNITED STATES PATENT QFFICE r'j' HYDROCAOUTCHOUO YARN No Drawing.

Application September 15, 1934,

Serial No. 744,199

Claims.

My present lnventionlias to do with a new and novel method of manufacturing artificial filaments, threads, films, and the like, from cellulosic solutions.

More particularly, my present process contemplates the production of viscose and cuprammonium yarns, and the like, possessing a subdued lustre and greater elasticity.

One object of the present invention is to provide a dull lustre yarn, as outlined above, which can easily be manufactured through the use of the ordinary solutions and apparatus customarily employed in the viscose and cupraminonium industry.

Other objects will in part be pointed out, and in part be apparent from a perusalof the following specification and claims.

The manufacture of artificial filaments and the like from viscose and cuprammonium solutions is Well known. In the former, cellulose is treated with alkali to form so-called alkali-cellulose, and this product, after shredding, is acted upon by carbon bisulphide to form a complex sulphur-cellulose compound, cellulose xanthate, soluble in water and sodium hydroxide. This so-called viscose solution is then spun or extruded into a coagulating medium and the cellulose regenerated to produce the yarn, etc., desired. In the second process, use is made of the fact that Schweitzers reagent (cupric hydroxide-ammonia) will dissolve cellulose. Cellulose is thus dissolved and extruded, usually into a moving stream of water which acts'to dilute the solvent to such an extent that copper and ammonia are removed, and the cellulose product remains. The present invention is concerned with the production of products from either one or these two basic compositions.

According to my invention, I use hydro-cyclocaoutchouc, or hydrogenated caoutchouc, as an addition to these spinning solutions. This compound is easily made by carrying out the hydrogenation at a temperature above 200 C., and raised hydrogen pressure. The action may be accelerated in several ways, for example, by using powdered copper, acetic acid, or the like.

When caoutchouc itself is heated a change ocours and part of the double linkage disappears. It is not fully saturated, since it contains four to five isoprene residues with one double linkage.

By hydrogenation in the manner set forth in (Cl. 10S40) U. S. Patent 1,654,844, a compound may be obtained which has properties totally different from those of the ordinary hydrocaoutchouc obtained, for example, by Staudinger and Fritschi, (Helv. v. 785).

My present invention, when I mention hydrocaoutchouc, embraces only that product which is a solid, white, amorphous mass, soluble in benzene, chloroform or ether, but insoluble in acetone or alcohol. It is not reactive with the chemicals 10 employed in the manufacture of viscose and cuprammonium yarns. Its index of refraction is approximately but I do not wish to be strictly limited to a compound having this exact index of refraction.

EmampZe.The powdered hydrocaoutchouc, in such finely divided form as to approach collodial size, is worked up with a small portion of the viscose or cuprammonium solution, and this portion thoroughly agitated with the main body of the mass. After filtration, etc., the solution may be spun. The amount of delustrant and elasticitygiving compound added should preferably vary between 1. and 10% of the cellulose content of the solution.

Because the hydrocaoutohouc may be added with the cellulose prior to the step of alkalization, or mixed with the cellulose prior to its solution in the copper oxide-ammonia solvent, I do not wish to be limited to the exact procedure of incorporating this substance in the spinning or extrusion solutions, but wish to cover broadly the 35 addition of this compound to the spinning solutions at any stage in their preparation.

Having now set forth my invention as required by the patent statutes, what I desire to claim is:

1. A spinning solution for the manufacture of 40 soft-lustre products comprising a solution of the group consisting of viscose and cuprammonium cellulose and a hydrocaoutchouc.

2. A spinning solution for the manufacture of soft-lustre products comprising a solution of the 45 group consisting of viscose and cuprammonium cellulose and about 1 to 10 per cent of a hydrocaoutchouc, said percentage being calculated on the cellulose content of said solution.

3. A spinning solution for the manul'ature of 50 soft-lustre products comprising a solution of the group consisting 01' viscose and cuprammonium cellulose and a hydrocaoutchouc, said caoutchouc being a solid, white amorphous mass, soluble in benzene, chloroform and ether, insoluble in acetone and alcohol and having an index of refraction of about 4. A spinning solution for the manufacture of soft-lustre products comprising a solution of the group consistingof viscose and cuprammonium cellulose and about 1 to 10 per cent of a hydrocaoutchouc, said caoutchouc being a solid, white, amorphous mass, soluble in benzene, chloroform and ether, insoluble in acetone and alcohol and having an index of refraction of about ngflji,

said percentage being calculated on the cellulose content of said solution.

5. A soft-lustre, cellulosic product of the group 10 consisting of viscose and cuprammonium cellulose having uniformly dispersed therein a small amount of a hydrocaoutchouc.

THOMAS H. BYRON.