US1876052A

US1876052A - Process for dyeing and figuring woven, knitted and plaited fabrics, leather, and other materials

Info

Publication number: US1876052A
Application number: US350820A
Authority: US
Inventors: Haendel Walter
Original assignee: Individual
Current assignee: Individual
Priority date: 1928-04-07
Filing date: 1929-03-28
Publication date: 1932-09-06
Anticipated expiration: 1949-09-06
Also published as: GB309166A

Description

Patented Sept. 6, 1932 UNITED STATES WALTER HAENDEL, or BERLIN, GEnM'AivY rEooEss FOR nYEme AND FIGURING wovEn, KNITTED AND PLAITED FABRICS, LEATHER, AND OTHER MATERIALS No Drawing. Application filed March 28, 1929, Serial No. 350,820, and in Germany April 7, 1928;

The present invention relates to a photochemical process for dyeing and figuring supports of any kind, in which light-sensitive bodies are applied to the support and then the latter is subjected to the action of light. 5. The essence of the invention consists in this that, more particularly for producing coloured patterns on dark ground .two compounds are applied to the support, one of which forms dyes only on exposure to light, whilst the other on the contrary, is capable of producing the dye only in the dark.

The advantage of the new process consists in this, that two different colours can be produced in one operative process by a single illumination. For formin one colour alightsensitive sulphonated bod is suitable. For the other colour, which orms in the dark, other dyestuffs are available,'for instance the indigo investigated by F. Sachs, and produced by Baeyers synthesis from nitrobenzalda. hydeand acetone. As "is well known nitrobenzaldehyde when exposed to light is converted into nitrosobenzoic acid:

ono COOH llght N02. NO.

An intermediate product in the above synthesis is a phenyl-lactio acid ketone with the reactive nitro group. This nitro-ketone, when acted on by fixed alkali, forms indigo, while under the a'ctionof light it is destroyed in the same way as described above and loses this capacity. I A

For 6. eing and figuring materials by the process escribed above, the following method is adopted. The material is treated with the sulphonic'di'azo compound and nitrophenyL,

lactic ketone. The support is now exp sed to light in a single operative process, thos places which are not to be influenced by the light being covered'ov'er by means of a stencil or an imprint. This im'print conslsts of a light absorbin'g covering colourwhich does not dye the fabric. At the exposed places the azo dyestufi' will thenbe formed, while at the nonexposed places, indigo will be formed under the 'action of phenol-alkali.

5o It is also possible to combinethe processes usually employed in printing with dyestuffswith the new process described above. Thus, -for instance, the cover negative printing process may be carried out in such a manner that the dye ground of the material is "formed photochemically, that is that the material is first treated with the light-sensitive colourless dyestuif components (for instance'with sodium phenyhdiazo-sulphonate and phenol alkali), the pattern is then printed on in the usual way, that is-with, the finished dyestuif and the usual additions,and thee whole is then exposed. The printed on pattern acts in this case as a light-protective colour, that is partially protects the light-sensitive dyestufi components which produce the coloured ground from being exposed and at the same time forms the colour of the pattern.

The light-sensi ive compounds may for in stance be produced as follows:

1. Sodium phenol-diazmsulphonate for the yellow partial impression. 9.3 grms. of ani- K line are dissolved in hydrochloric acid having a HCl content of 10 grms. are cooled to 3 to 5 C. and are quickly mixed with 7.2 grms. sodium nitritedissolved in a little water. During this operation care should be taken that the temperature does not rise above 5 C. Phenyl-diazochloride is formed, which may be readily converted into the sulphonicsalt by being mixed with sodium sulphite. For this purpose sodium bisulphite and sodium hydroxide are .used with advantage. As this recipe is carried out 'for mol., the two latter reagents are of course also used in this quantity, that is 10.4 rms. bisulphite and 4 grms. sodium hydroxi e.

For treating the material a mixture of s odium phenyl-diazosulphonate,' phenol and sodium hydroxide are used in molecularv quantities. 2. Sodium diphenyltetrazosulphonate for the red; partial' impression. .ommen.cing with benzidine the process is carried'out with double molecular quantities in the manner 'de-' r scribed in paragraph 1. For exposure a mixture of this compound with resorzin and sodium hydroxide in molecular'quantities is used. F

'3. Sodium ditollyltetrazosulphonate for 99 the blue partial impression. Commencing with tolidine, the process'is carried out as with benzidine-by coupling forv the exposure with 1.8 amidonaphthol-QA disulphonic acid and ,8 naphtylamine each in half molecular quantities. The tone and the fastness of j the colours may be subsequently influenced by treating with metallic salts, such as cupric chloride, ferric chloride, and potassium bichromate.

In the manner described every -N=N compound may be converted into a sulpho: nated compound and developed on the material into a dyestuff by the photo-chemical process above described. ,It is also possible further to diazotize either before or after sulphonation a tetrazo, salt coupled half molecularly with an amine and thus to build up complex molecules. The sulphonated N=N- salts are without exceptionconsiderably more stable than the hydrochlorides, most of them even to an unlimited extent and may therefore be made for stock.

WhatI claim is:

- 1. A process for producing a coloured pattern on a dark ground on woven, knitted and plaited fabrics, leather and other materials, consisting in treating the material with two compounds, one of which is capable of form- I "ing a dyestu'ffonly under the action of light and the other of which is capable of retaining its. capacity to form a dyestufll' only in the dark, and thereupon exposing the material to the action of light, modulated by a pat- '35 .tern as set forth.

2. A process for producing a coloured pat tern on a dark ground on woven, knitted and plaited fabrics, leather and other materials, consisting in treatin the material with 40 two compounds, one of wiich iscapable of forming a dyestuff only under the action of light and the other of which is capable of retalning its capacity to form-a dyestufl only 5 in the dark,': printing on the material thus" '4! treated a negative in the form of a light-absorbing covering colour which does not dye the material and thereupon exposing the material to the action of light, modulated by a pattern as and for the purpose set, forth.

. In testimony whereof Ihave signed my name to this specification.

" WALTER HAENDEL.