DE530906C - Process for the preparation of acidic wool dyes - Google Patents

Description

Process for the preparation of acidic wool dyes It has been found that acidic wool dyes of great purity are obtained if aminonaphthalic acid derivatives of the general type: where x denotes hydrogen, alkyl, aralkyl or aryl, or reacts their substitution products with nitrohalogenoarylsulfo- or -carboxylic acids once or twice.

The aminonaphthalic acid derivatives used as starting bodies can you can represent, for example, from Aminonaphthalsäureanhy drides or their substitution products by reacting with ammonia, aliphatic and aromatic amines or by Nitration of naphthalic acid derivatives and subsequent reduction.

The new dyes dye the animal fibers in acidic baths clear, greenish yellow to orange-yellow tones. Examples i. i io parts by weight 4-aminonaphthalene ethylimide - represented from 4-aminonaphthalic anhydride by Condensation with aqueous methylamine - be i-chloro-2-nitrobenzene-4-sulfonic acid with 140 parts by weight Potassium in about 2,000 parts by volume of water with the addition of 100 parts by weight of ground Chalk heated to 14o to 15o ° in the autoclave for a few hours. After completion of the implementation is filtered off with suction while hot and the residue is extracted with hot water. After narrowing of the filtrate to a smaller volume, the dye formed separates out; further quantities can be obtained by salting out in a known manner.

The dye is a yellow powder that dissolves in water dissolves and colors the animal fiber from acid baths very unimportant yellow-orange, from good ones Authenticity properties.

2. Used instead of the q-aminonaphthalmethylimds of the example i here 4-aminone: aphthaläthylimid, the result is a dye with similar properties.

3. If instead of i-chloro-2-nitrobenzene-4-sulphonic acid potassium des Example i here for condensation the i-chloro-4-nitrobenzene 2-sulfonic acid If sodium is applied, a dye is produced, which the animal fiber from acid .Bath in a: @ greenish, very clear yellow color.

When using 4-aminonaphthalethylimide, a dye is formed of similar properties.

4 .. i40 parts by weight of 4-aminonaphthalphenylimide are in the autoclave with 140 parts by weight of 4-sulfo-i-chloro-2-nitrabenzene with the addition of 140 parts by weight Chalk in 500 parts by volume of water heated to between 150 and 60 ° C for 10 hours. After Working up, as indicated in Example i, results in a yellow dye of good quality Authenticity properties.

5. 31.6 parts by weight of 4-aminonaphthal-3`-4! -Dimethylphenylimide as a finely divided paste .with 2, i, 5 parts by weight of i-chloro-2-nitrobenzene -4-sulfosaurem Potassium and 22 parts by weight quicklime in 300 parts by volume of water for 24 hours heated in the autoclave with stirring to 120 to 130 ° C. The product comes with iooo Hardly any water is diluted, boiled and filtered hot.

A known method is obtained from the filtrate by salting out yellow powder that dissolves in water with a yellow color, and that of acidic baths animal fiber dyes in clear, greenish yellow tones.

Is used instead of i-chloro-2-nitrobenzene-4-sulphonic acid potassium the isomeric i-chloro-4-nitrobenzene-2-sulfonic acid potassium, a dye is obtained of similar properties.

Claims (1)

PATENT CLAIM; Process for the preparation of acidic wool dyes, characterized in that aminonaphthalic acid derivatives of the general type: in which x is hydrogen, alkyl, aralkyl or aryl, or their substitution products are condensed once or twice with nitrohalogenoarylsulfonic or carboxylic acids.