US1733447A - Production of ice colors - Google Patents

Description

Patented Oct. 29, 1929 UNITED STATES PATENT OFFICE WILHELM CHRIST, OF OFFENZBACH-ON-THE-MAIN, GERMANY, ASSIGNOR TO GENERAL ANILINE WORKS, IN 0., OF NEW YORK, N. Y., A CORPORATION OF DELAWARE PRODUCTION OF ICE COLORS 1T0 brewing. Application filed November 19, 1925, Serial No. 70,186, and in Germany December 1, 19%

The present invention relates to-the production of the so-called ice-colors.

The production of ice-colors by means of those azo components which possess a defi- 5 nite substantive character is generally carried out b adding a cotton mass with a solution- 0 t e proper azo component, de-

- hydrating as far as possible by squeezing,

pressing, suction, or'centrifuging, and then,

without drying, developing, while still moist,

by means of a diazo compound. Even when dehydrated as completely as possible, the

fiber always mechanically retains a not inconsiderable amount of the padding liquor.

18 Particularly in packed material and warpbeams the spaces between the material hold considerable quantities of the padding liquor whose removal is desired in the production of unobjectionable colors, which is particularly 20 important in the use of azo components having only weak substantive properties.

This invention is based on an improvement in the production of ice-colors by means of azo components whose character allows the development of the padded articles in moist condition, which consists in removing the paddingsolution held by the material after padding or dehydration, by treatment with a rinsing solution whi h contains. an electrolyte as an essential co ponent. By the expression electrolyte as used herein is to be understood not only a salt, but also a caustic soda solution. p

The rinsing li uid may consist of a more or less weak pad ing solution to which caustic soda solution and a salt have been added,

or in case the azo component used has a ionounced substantive character, of mere y a' solution of a salt, which in certain circumstances is partly replaced with some caustic soda, or merely of a dilute caustic soda solution. B subsequent development there are produce which cannot be obtained without the removal of the padding solution not fixed on the fiber, so that the dyer working with less care can obtain unobjectionable colors with certain use, for example, in the production of ice colors much faster to rubbing colors by means of the arylids or arylendiimines of 2.3-hydroxynaphthoic acid (see U. S. Patent No. 1,099,108), or by the use of acetoacetyl or diacetoacetyl compounds of amino bases, as described in British Patents Nos. 211,772 and 211,814, as well as in all cases in which there is used an azo component whose substantive character allows the degeopment of the padded article in moist con- A. further important advantage of the here-' indescribed process lies in the fact that in this way, by the treatment with alkaline wash solutions, it is possible toiremedy any possible injuries produced from the padding material on the fiber due to the action of the air during centrifuging, suction, or continued standing, which possibly leads to the formation of streaky or weak colors. Since further centrlfuging or suction is unnecessary, and as a result the air cannot further come into play, there is obtained in this way colors wholly devoid of objection.

In using the described method of procedure, it is no longer necessary to add formaldehyde to the padding solution, for example, of 2.3 hydroxynaphthoic acid arylids, by means of which the padded articles are normally protected from the influenceof the air, in so far as the process is carried out in the hereinabove described manner followin the deh dration step, and the color develope immediately thereafter. If, however, the mentioned solutions are used for washing before the centrifuging or suction operation, or if it is necessary to allow the mass to stand for some time before the development of the color, it is best to work in such a way that padding is carried out with a adding solutio containin no addition of ormaldehyde, an to add t ev formaldehyde to the mentioned displacing solution. In this way there "is obtained in the simplest manner a (padding bath free from formaldehyde, an which therefore possesses an unweakened permanency, while on the other hand the padded yarns are rendered securely stable in the air.

The new process is useful in all processe for the production of colors developed on the jectionable and good colors fast to rubbing are obtained in all cases. I Ewample 1 30 kg. of yarn are padded in a bath with a solution containing 7 gr. of 2.3-hydroxynaphthoic acid anilid, caustic soda solution, and 7 c. c. of formaldehyde to the liter. The yarn is centrifuged and washed in the bath with a solution containing 0.5 gr. of 2.3-hydroxynaphthoic acid anilid, and further containing besides the amount of canstic soda necessary to keep it in solution 10 .c. c. of caustic soda solution of.34 B. and 30 gr. of common salt per liter. After thewashing, the washing solution is allowed to ,drain, and then the yarn is developed in the usual way. E Z6 2 wamp A warpbeam of kg. ispadded in anopen or closed dyeing apparatus with a solution containing 2 gr. of 2.3-hydroxynaphthoic aeid-beta-naphthalid and caustic soda per liter, pressed out with compressed air, and

rinsed with a bath containing 40 gr. of com- 'mon salt and 10 c. c. of caustic soda solution of 34 B. (per liter. After rinsing it is again dehydrate by pressing and developed in the usual way.

Example 3 100 kg. of cross reels are padded in mapparatus according to the pack system, with a solution contaimng 1.5 gr. of bis-2.3-hy-- Example 4 50 kg. of cotton yarn are padded in 1000 liters of a solution containing 2 gr.

of 2.3-hydroxynaphthoylaminohydrochinondimethylether per liter and caustic soda. The

I padding bath is free from formaldehyde.

After padding it is allowed to drain and the padded article is placed in a rinsing bath containing 50. gr. of common salt, 10 c. c. of caustic soda solution of 34 B6. and 2 c. c of formaldehyde per liter, removed after the rinsing centrifuged and developed in the usual way.

In the following claims the term rinsingliquid is intended to comprise only suc aqueous liquids as contain the padding constltuent, if at all, only in concentrations substantially less than the concentration of padding constituent in the liquid contained in the goods coming from the padding solution.

I claim:

1. In processes of producing ice colorson electrolyt 2. In processes of producing ice colors on textile materials from azo components, the character of which allows the development of the padded material in moist con ition, the step comprising treating the padded material with a rinsing liquid containing a caustic alkali.

3 In processes of producing ice colors on textile'materials from azo components, the character of which allows the develo ment of the padded material in moist con ition, the step comprising treating the padded material with a rinsing liquid containing a caustic alkali and an alkali metalsalt.

4. In processes of producing ice colors on textijle materials from azo components, the character of which allows the develo ment of the padded material in moist con ition, the step comprising treating the padded material with a rinsing liquid containing a caustic alkali, an alkali metal salt and formaldehyde.

5. In processes of producing ice colors on textile materials from azo components, the character of which allows the develo ment of the padded material in moist con ition, the step comprising treating the padded ma; terial with a rinsing liquid containing a nonacidic electrolyte and-the padding solution in a concentration substantially less than that of the original padding liquor.

6. In processes of producing ice colors on textile materials the step comprising treating the textile material, padded with a 2-3-hydroxynaphthoic acid arylid compound, with a rinsing liquid containing a non-acidic electrolyte.

7. In processes of producing ice colors on textile materials the step comprisin treating the textile material, padded wit a 2-3 hydroxynaphthoic acid arylid compound, with a rinsing liquid containing a caustic alkali.

8. In processes of producing ice colors on textile materials the step comprising treating the textile material, padded with a 2-3- .hydroxy-naphthoic acid arylid compound,

hydroxynaphthoio acid arylid compound, with a rinsmg liquid containing a. non-acidic electrolyte and the padding solution in a. concentration substantially less than that of the original padding liquor. v

- In testimony whereof, I aflix my signature.-

Dlt WILHELM CHRIST.