DE845636C - Process for the production of real colors on fibrous materials - Google Patents

Description

Process for the production of genuine dyeings on fibrous materials It has been found that genuine dyeings can be produced when using monoazo dyes of the general formula which are free from carboxyl and sulfonic acid groups in which R is an aromatic radical of the benzene series which contains a hydroxyl group in the o-position to the azo group and the rest denotes the radical of a 2-oxynaphthalenesulfonic acid amide bonded to the azo group in the i-position, where X and Y are hydrogen atoms, alkyl groups or oxyalkyl groups, where X and Y together can contain up to 8 carbon atoms contain a chromium-releasing agent.

A dyeing process of this type is e.g. B. the one where with solutions is colored, which at the same time the dye, an alkali chromate, such as. B. sodium chromate or potassium chromate, and ammonium sulfate.

According to the present process, in particular on wool, but also very much on synthetic fibers made of super polyamides or super polyurethanes valuable colorations, which are usually carried through very good wet fastness properties and, above all, are characterized by very good to excellent lightfastness. Particularly valuable, e.g. B. navy blue to black shades can according to the present Process with those dyes which have a nitro group in the remainder of the diazo component included.

In some cases, the present process also gives from mixtures of two or more of the definition given above Very valuable color tones. Such mixtures can either be obtained by mixing. of the individual dyes or, if it is z. B. to dyes from the same Coupling component and various diazo components acts through simultaneous Diazotization of the mixture consisting of different amines and / or simultaneous Combining the various diazo compounds with the coupling component produced will.

The following example serves to explain the invention. The parts mean parts by weight, and the percentages mean percentages by weight.

Example A dyebath is ordered with 2 parts of potassium chromate, 2 parts of ammonium sulfate, 10 parts of crystallized sodium sulfate and 4 parts of 5-nitro-2-amino-i-oxy-benzene obtained by coupling with 2-oxynaphthalene-6-sulfonic acid amide available dye. 100 parts of well-wetted wool are put into this dyebath at 60 °, the temperature is raised to a boil within 30 minutes and cooked for 45 minutes. Then 0.5 parts of 40 ° acetic acid are added and the mixture is boiled for a further 45 minutes. The wool is. Really bluish black in color.

The table below lists a number of other dyes which, when dyed according to the above process, also produce valuable dyeings with very good fastness properties urea from Diazo component, coupling component, color shade 4,6-Dinitro-2-amino-i-oxybenzene ....... 2-Oxynaphthalene-6-sulfonic acid amide reddish-black 7 4-nitro-2-amino-i-oxybenzene ........ .... the same black ... 6-chloro-4-nitro-2-amino-i-oxybenzene ..:. also dark brown 6-nitro-4-chloro-2-amino-i-oxybenzene ..... also reddish black 5-nitro-2-amino-i-oxybenzene ........... 2-oxynaphthalene-6-sulfonic acid methyl black amide 4-nitro-2-amino-i-oxybenzene ........... 2-oxynaphthalene-6-sulfonic acid dimethyl- reddish black amide 4-nitro-2-amino-i-oxybenzene ........... 2-oxynaphthalene-6-sulfonic acid-ß-oxy- black ethylamide 6-chloro-4-nitro-2-amino-i-oxybenzene .... 2-oxynaphthalene-6-sulfonic acid-ß-oxy- dark brown ethylamide black 5-nitro-4-chloro-2 = amino-i-oxybenzene ..... 2-oxynaphthalene-7-sulfonic acid amide greenish- navy blue 4-nitro-2-amino-i-oxybenzene. . . . . . . . . . . 2-oxynaphthalene-7-sulfonic acid amicl black 4-nitro-2-arriino-i-oxybenzene. . . . . . . . . . . 2-oxynaphthalene-4-sulfonic acid amide dark black-brown A very valuable deep black dyeing is obtained if 100 parts of wool are dyed as described above with a mixture consisting of 3 parts of the dye of dianotized 5-nitro-2-amino-i-oxybenzene and 2-oxynaphthalene-6-sulfonic acid amide and i part of the dye from dianotized 4-nitro-2-amino-i-oxybenzene and 2-oxynaphthalene-6-sulfonic acid amide.

Claims (5)

PATENT CLAIMS-i. Process for producing fast dyeings on fibrous materials, characterized in that monoazo dyes of the general formula which are free from carboxyl and sulfonic acid groups in which R is an 'aromatic radical of the benzene series which contains a hydroxyl group in the o-position to the azo group and the remainder denotes the radical of a 2-oxynaphthalenesulfonic acid amide bonded to the azo group in the Z position, in which X and Y are hydrogen atoms, alkyl groups or oxyalkyl groups, where X and Y together can contain up to 8 carbon atoms, is colored in the single bath process by means of solutions which at the same time contain the dye and a chromium donating agent. 2. The method according to claim i, characterized in that: one dyes of the general formula used, in which R denotes an aromatic radical of the benzene series which contains a hydroxyl group in the o-position to the azo group. 3. Process according to Claims i and 2, characterized in that one dyes of the general formula used, in which R denotes an aromatic radical of the benzene series which contains a hydroxyl group and also a nitro group in the o-position to the azo group. 4. The method according to claims i to 3, characterized in that; that one dyes of the general formula used, in which one X is a hydrogen atom and the other X is a nitro group. 5. The method according to any one of claims i to 4, characterized in that that it is colored by means of such solutions, which at the same time contain the dye, an alkali chromate and ammonium sulfate.