US2070194A - Process for the manufacture of multicolored filaments - Google Patents

Description

Feb. 9, 1937. R. BARTUNEK ET AL 2,070,194

PROCESS FOR THE MANUFACTURE OF MULTIGOLORED FILAMENTS Filed June 15, 1934 4 Patented Feb. 9, 1937 UNITED STATES PROCESS FOR THE MANUFACTURE OF MULTICOLORED FILAMENTS Richard Bartunek, Teltow-Seehof, near Berlin,

August Hartmann,

Berlin-Lichterfelde,

hann Joseph Stoeckly, Teltow-Seehof, near Berlin, and Johannes Uytenbogaart, Berlin- Lichterfelde, Germany,

assignors to North American Rayon Corporation, a corporation of Delaware Application June 15, 1934, Serial No. 730,718 In Germany June 17, 1933 2 Claims.

It has, heretofore, been proposed to obtain colored artificial silk by admixing dyes, organic and mineral pigments to the cellulosic spinning solution before the same is spun. Unfortunately however, it has been impossible to find for each and every color and color shade, respectively, a suitable dye possessing a sufficiently large covering power and resistance to attack by the chemical reagents present in the spinning solution. In addition, it has been found impractical to operate with so many different pigments in the manufacture of artificial silk.

One object of the present invention is the use of only a few and selected pigments to produce multicolored artificial silk.

A second object of the present invention consists of the mixing of differently colored spinning solution batches prior to entering the spinning machines and an arrangement therefor.

A third object of this invention is the production of color pastes adapted to be added to spinning solutions.

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

The basic idea of the present invention consists in producing multicolored artificial silk, horse hair, ribbons, films, etc. from cellulosic spinning solutions, such as viscose, cellulose esters, cellulose ethers, cuprammonium cellulose, etc., by adding thereto prior to the spinning thereof a limited number of stable pigments. Since it is necessary that these pigments be inert towards chemical reactions induced by the spinning solution, the spinning baths and the reagents used in the finishing of the yarn, a special dye has, heretofore, been selected to produce a distinct color shade. This practice necessitates, however, the use of a huge number of separate dyes in view of the multitude of color shades demanded by the customers. In order to overcome these drawbacks, the present invention contemplates the use of fine color pigments of that type used in color printing, these pigments being characterized by a high covering power. I have, moreover, found by experimentation that it is possible to produce almost any color shade in artificial silk by using at least two pigments. Better results are obtained by employing three or more pigments, for example, a red, yellow and blue pigment in combination with a white and black pigment, the latter pigments serving to control the brightness and the degree of saturation of the color. Suitable pigments are the following:

For red: Pergamentrot F 4 R (a color lake) and Chromred (tin chromate).

For yellow: I-Iensagelb 5 G and zinc yellow.

For blue: Ostenblau B. C. D. and cobalt blue.

For white: Titanium oxide and zirconium white.

For black: American carbon black and carbon black.

In order to produce a distinct color, such as green, one may use two color pigments of the aforementioned groups, for example parts of Hensagelb and 50 parts of Ostenblau. The following examples will serve to explain the working principle of the invention.

Example 1 Example 2 In order to produce a film having a strong green color, following Example 1, 600 g. Hensagelb 5 G and 300 g. Ostenblau B. C. D. are added to 1 cubic meter of viscose.

Example 3 For the production of ribbons a wide film is first formed and the same subsequently cut into strips. For this purpose two inorganic pigments, namely 2 parts of Ultramarin and 1 part of Zincgelb are homogeneously dispersed in 100 parts of cellulose acetate containing about cellulose.

It is to be noted that, according to this invention, two or more pigments are employed to produce a product of distinct color, these pigments being optically independent from each other, for example a pure red and blue or a pure yellow and blue. Even such pigments may be used having several wave-lengths in common, provided they may be regarded as being optically independent. In addition to the two basic colors, a white pigment (zinc oxide, titanium oxide, zircom'um oxide, tin oxide, etc.) or a black one (carbon black or the like) respectively, may be used in combination therewith. According to this invention, it is possible to produce directly, the desired color shades, whereas they would otherwise have to be obtained by a number of treatments in dyebaths in the conventional manner.

Instead of dispersing all of the pigments used in a cellulosic spinning solution, it is also contemplated to add only one dye to such a solution, or, in other words, to dye part of the spinning solution for example blue and the remainder yellow. The blue and yellow colored spinning solutions are then united by mixing to produce the color shade desired shortly before entering the spinning machines. Fig. l of the attached drawing depicts a suitable arrangement for carrying out this process. Normally dyed spinning solutions are stored in the vessels 5, 2, and 3. These three spinning solutions may be for example, red, yellow and blue, and it is also possible to provide two additional vessels containing black and white spinning solutions. The vessels 1, 2, and 3 are connected with the pipes l, 5, and 3, respectively. The pipes l, 8, and 9 branch off from the pipes 4, 5, and 6, respectively, and they contain power-driven feeding pumps, for example gear pumps If], H, and i2 which may be closed by the cooks l3, M, and i5. These branch pipes terminate in a common mixing piunp 55, from which the definitely mixed spinning solution reaches the spinning machine I8. From the vessels l 2, and 3 and the corresponding pipes, other spinning machines i8 and I8 may be supplied in analogous manner by means of branch tubes, feeding and mixing pumps with spinning solutions. In this manner it is possible to obtain any color shade desired from a few pro-colored spinning solutions which are stored in a few vessels and fed through permanent pipes to the places of consumption. At these places of consumption, i. e. the spinning machines, measured quantities of the various standard solutions are withdrawn, mixed in suitable proportions, and fed to the spinning machines. The proportions of the colored spinning solution batches depend upon the denier of the filaments to be spun. In this manner it is only necessary to vary these proportions in order to vary the color of the finished artificial silk. Only the portions of spinning solution delivered by the cocks 13, i i, and i5 must be controlled while all other conduits before these cocks continuously deliver the same dye solutions. It has also been found that it is advantageous to unite the differently colored spinning solution batches before the spinning machines.

A modification of this invention contemplates using pigment pastes which are added to the cellulosic spinning solutions. Two or more pigments are mixed together in paste form and dispersed in the spinning solution. It is also possible to color part of the spinning solution with the pigment paste and to continuously feed this composition in measured quantities to the principal spinning solution. In this manner it is possible to produce multicolored cellulosic products, such as artificial silk, horse hair, ribbons, films from viscose, cuprammonium, cellulose acetate and cellulose ether solutions without changing the principal feed lines of the spinning machines. It is only necessary to finely disperse the pigment paste in the principal spinning solution before the same enters the spinning machine. The quantity of pigment paste to be incorporated depends upon the pigments per se, their proportions in the paste and the final color shades desired. A change of the depth of color and even of the color shade can be made without interrupting the spinning process.

While I have found that the ingredients and proportions mentioned above give the desired results, I do not wish to be limited to the use of all of these ingredients, to these ingredients and no others, nor to the exact proportions set forth above, since the omission of some ingredients or a slight variation of the proportions cited above will not adversely affect the final products, although it may vary somewhat the relative characteristics of such products resulting from such variations. Modifications of the invention will manifest themselves to those skilled in the art, and I desire to include such of these coming within the scope of the appended claims.

In the claims carbon black will be used in a generic sense to include American carbon black.

What is claimed is:

l. The method of producing insitu colored filaments of artificial silk of any desired hue which comprises preparing separate batches of cellulosic solutions differently colored, continuously flowing and intimately mixing together regulated quantities of at least two separate batches of said solutions to form a single batch having the desired hue and, thereafter, extruding regulated quantities of the last mentioned batch to produce a thread having the desired colored. characteristics.

2. An apparatus for use in preparing colored artificial silk filaments of any desired hue including a plurality of separate storage tanks, each tank containing a cellulosic spinning solution previously colored with a primary or basic color, individual feed pumps and supply pipes connecting each of said tanks, individual flow regulating control valves in each of said supply lines, a series of supply pipes emptying into a common mixing chamber, a pump connected to said mixing chamber and discharging regulated quantities of the mixed solutions to a filament forming machine,

RICHARD BARTUNEK. AUGUST I-IARTMANN. JOHANN JOSEPH STOECKLY. J OHANNES UYTENBOGAART.

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