US2145580A - Spinning solutions containing organic dyes and products thereof - Google Patents

Description

Patented Jan. 31, 1939 UNITED STATES SPINNING SOLUTIONS ooNTAININo. ORGAN- 1o DYES AND PRODUCTS THEREOF Rudolph S. Bley, Milligan College, Tenn., assignor to North American Rayon Corporation, New York, N. Y., a corporation of Delaware No Drawing. Application October 13, 1934, Se-

rial No. 748,259. Renewed June 7, 1938 3 Claims.

The present invention relates to a process of producing dyed rayon products, such. as filaments, yarns, ribbons, films, etc., by admixing suitable organic dyes with the spinning solutions prior to 5 the extrusion thereof.

The primary object of my invention has to do with the addition of such organic dyes to strongly alkaline spinning solutions, such as viscose, cuprammonium cellulose, silk fibroin, alkali metal alginates, gelatine, etc., which will not be deleteriously affected by alkali or acids, desulphurizing agents and bleaching compounds used in the manufacture of artificial products from said spinning solutions.

Another object of this invention has to do with the incorporation of Triazol-Echtrot C (Griesheim), Toluylenrot (Griesheim), Triazol- Reinblau R, etc., into strongly alkaline spinning solutions.

Other objects of my invention will become apparent to those skilled in the art after a study of the following specification.

I am well aware that it has, heretofore, been proposed to add inorganic pigments to cellulosic spinning solutions with a view of forming therefrom dyed products. However, until the present time, it has been impossible to incorporate organic dyes into strongly alkaline spinning solutions without impairing the colors of the finished products. Viscose rayon, for example, is produced by treating cellulose with strong caustic alkali to form alkali cellulose which, subsequently, is transformed into cellulose xanthogenate (viscose) with the assistance of carbon bisulphide. After 1 ripening the viscose solution, it is spun into a sulphuric acid bath, etc., to form regenerated cellulose. The sulphur is removed from the regenerated cellulose with alkaline sulphides, such as ammonium sulphide, etc. Finally the viscose 40 products are bleached with sodium hypochlorite solutions, etc.

Cuprammonium cellulose is produced by dissolving cellulose in copper hydroxide-ammonia solution and spinning the dissolved cellulose into acid or alkaline spinning baths. The products are then freed from copper and bleached. In a similar manner, artificial products are made from alkaline solutions of alginates, silk fibroin, gelatine, etc. From the above, it will readily be recog- 50 nized that only such organic dyes can be incorporated into alkaline spinning baths which are resistant to acids, desulphurizing agents and bleaching compounds, otherwise satisfactory products cannot be obtained. It is for this reason that rayon products have, heretofore, been exclusively dyed in finished form, i. e., after removal of sulphur, bleaching agents, etc. Unexpectedly,

I have found that a number of organic dyes, for

example Triazol-Echtrot C (Griesheim), To-

luylenrot (Griesheim) Triazol-Reinblau R,

etc. can be admixed with strongly alkaline spin ning solutions without being decomposed by the same. These dyes are manufactured by the Chemische Fabrik Griesheim-Elektron in Germany and. sold under the aforementioned tradenames.

These dyestuffs have the following chemical structures:

(1) Triazol-Echtrot C (Grieslieim): O2eHinNn01SNai C 0 0 Na ITIH:

G. Schultz Farbstoiftabellen, VII edition, Vol. pp. 171, No. 410.

(2) Toluylenrot (Griesheim): Ca1H aNgOnS4Na4Clz OaNa Cl 1 G HzN S oaNB HaN S OaNfl Qnag S OaNa G Schultz arbstofftabellen", VII edition, Vol. I,

pp. '177, No. 425

(3) 'lriazol-Reinblau R (Grleshoim): o n monsmas G. Schultz Farbstoiftabellefl, VII edition, Vol. I, pp. 193, No. 469.

They may be dissolved and/or dispersed in alkaline spinning solutions to form therewith after extrusion uniformly dyed products. The proportions of dye, added to the spinning solutions, may

be varied at will in order to produce any desired color-shade, and it is possible to admix a plurality of different dyes with a single batch of spinning solution. Instead of admixing the dyes with the whole bulk of spinning solution before entering the spinning machines, it is advisable to strongly dye a portion of the spinning solution and to mix it with the rest of spinning solution just before entering the spinning machines.

Modifications of my invention will readily be recognized by those skilled in the art, and I wish to include all modifications falling within the scope of the appended claims.

I claim:

1. A spinning solution for the manufacture of dyed artificial products comprising a viscose solution and a dye of the group consisting of Triazol- Echtrot C (Griesheim) having the formula C29H19N5O7SNa2, Toluylenrot (Griesheim) ,having the formula Cs2I-IisNeO12S4Na4Cl2 and Triazol-Reinblau R having the formula 2. A spinning solution for the manufacture of dyed artificial products comprising a cellulosic solution of the group consisting of viscose and cuprammonium cellulose and an organic dyestufi of the group consisting of Triazol-Echtrot C (Griesheim) having the formula C2sH19N5O7SNa2, Toluylenrot (Griesheim) having the formula C32H1sNsOi2S4Na4C'l2 and Triazol-Reinblau RlGriesheim) having the formula C34H24N5O11SsNa3.

3. A spinning solution for the manufacture of dyed artificial products comprising a cuproammonium cellulose solution and a dye of the group consisting of Triazol-Echtrot C (Griesheim) having the formula C29H19N5O7SNa2, Toluylenrot (Griesheim) having the formula C32H18N6012S4N3AC12 and Triazol-Reinblau R having the formula C34H24N5O11S3Na3.

RUDOLPH S. BLEY.