DE499968C - Process for the preparation of acidic wool dyes - Google Patents

Description

Process for the preparation of acidic wool dyes. Patent addition 494 446 In the main patent 494 446 is a method for the preparation of acidic Wool dyes described by the condensation of sulfonic acids, nitro and aminosulfonic acids, also sulfamic acids of naphthalic anhydride with ammonia, aliphatic or aromatic amines or by converting the reaction products of naphthalic anhydride or its derivatives with ammonia, aliphatic or aromatic amines in sulfonic acids or sulfamine, acids, or further by condensation of naphthalic anhydride or its derivatives wade with sulfonic acids from amines.

It has now been found that similar or identical acidic dyes are obtained if halosulfonaphthalic anhydrides or derivatives are used. general type: where both the halogen and the sulfo group can be in different positions of the molecule, reacts with ammonia, aliphatic or aromatic amines. The result is acidic wool dyes with good leveling power and very clear nuances from the greenest yellow to the redest orange, presumably of the following constitution where X is hydrogen, alkyl, aralkyl or aryl. Examples i. 40 parts by weight of sulfo-4-bromonaphthalic anhydride (obtained by sulfonating 4-bromonaphthalic anhydride) are heated with aoo parts by volume of ammonia in an autoclave to 110 to 120.degree. After the reaction has ended, the mixture is filtered off with suction while hot, the excess ammonia is driven off and the dye formed is salted out in the customary manner, filtered off with suction and dried; it turns the animal fibers from acid baths clear yellow.

2. 2o parts by weight of sulfo- [bromonaphtha] acid anhydride are in Zoo Parts by volume of water with 20 parts by weight of p-toluidine are exheated to boiling for several hours. The excess p-toluidine is then removed by steam. When cooling down The new dye is deposited in reddish crystals on the felt vacuumed and dried. He dyes wool from an acid bath very indifferently in a clear one reddish orange.

Is used instead of p-toluidine z. B. Aniline and proceed as given in example z, one obtains its dye with similar properties, a little less reddish.

3. 25 parts by weight of sulfo-q.-chloronaphthalic acid or its anhydride are: with i 2o parts by volume of an approximately 3% aqueous methylamine solution with stirring, initially at 6o to 70 ° C for a few hours and, after adding another 5o space files of the above methylamine solution, to 9o to 100 ° C heated.

After cooling, the dye formed is by looking, for example by adding common salt, completely separated, sucked off, with common salt solution washed and dried.

It represents a deep yellow. colored powder, which is water-soluble and dyes the animal fibers in yellow tones from acid baths.

Other aminoanthraquinones can also be used in the same or a similar manner use for implementation.

Claims (1)

HATENTANSPRUCJ-I: Modification of the procedure of the Pa ----- t, ents - 4g4 4-46-zur - representation "vori acidic wool dyes, characterized by the fact that # one here, llalogensulphonaphthalic acids or derivatives with ammonia, aliphatic or aromatic amino compounds.