DE273280C - - Google Patents

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- JVe 273280 CLASS 22 «. GROUP

FARBENFABRIKEN vorm. FRIEDR. BAYER & CO. in LEVERKUSEN b. CÖLN a. Rh.

Process for the preparation of developer dyes. Patented in the German Empire on January 8, 1913.

If you have m-nitrobenzoyl-p-phenylenediaminesulfonic acid diazotized, coupled with the pyrazolone obtainable from the dehydrothiotoluidinsulfonic acid by a conventional method and the Reduced nitro group in the usual way, a yellow dye is obtained, which characterized by an excellent affinity for cotton fibers, and its coloration Diazotization and development with ß-naphtol

ίο delivers a reddish yellow.

This result is of technical importance because such yellow nuances are caused by development were previously inaccessible on the fiber with ß-naphtol.

Instead of the nitrobenzoyl-p-phenylenediamine -sulfonic acid can be any other nitroarylacidyl derivatives of aromatic diaminesulfonic acids, instead of the pyrazolone from the dehydrothiotoluidinsulfonic acid pyrazolone derivatives of others aromatic thiazole derivatives can be used.

Example.

337 parts of m-nitrobenzoyl-p-phenylenediaminesulfonic acid are diazotized with 69 parts of sodium nitrite and hydrochloric acid and with 404 Share i-dehydrothiotolyl-3-methyl-5-pyrazolone sulfonic acid combined in soda-alkaline solution. Then 450 parts of crystallized sodium sulphide are added; it is boiled and after dissolving the dye, salted out by adding common salt, filtered and dried. He draws with yellow paint on cotton. The diazotized color results in development with ß-naphtol real reddish yellow.

Instead of nitrobenzoyl-p-phenylenediaminesulfonic acid one can generally mononitroarylacidyl derivatives of aromatic diaminesulfonic acids, e.g. B. 4x4'-diaminodiphenyl-3x3'-disulfonic acid, 4 4 '- diaminodiphenylurea 3 3' - disulfonic acid, diaminostilbene disulfonic acid, Use 2 · 6 - toluenediamino - 4 - sulfonic acid. They are obtained through condensation from Z. B. one molecule of nitrobenzoyl chloride with one molecule of the corresponding diaminosulfonic acid in alkaline or acetic acid solution. Their sodium salts, some of which are yellow in color, are light in hot water, Slightly soluble in cold water. The free acids are insoluble in water. You let Diazotize in the usual way and couple with azo components.

Instead of the pyrazolone from the dehydrothiotoluidinsulfonic acid, those from the primulin sulfonic acid, from the aminophenyli · 2-naphtothiazole-7-sulfonic acid and others aromatic aminothiazole derivatives can be used. These pyrazolone derivatives are in the usual way by reducing the corresponding diazo compounds to hydrazines and condensation of the same with acetoacetic ester or oxaloacetic ester. they are colored yellow as free acids and combine

Claims (1)

open to azo color with diazo compounds. Instead of the nitro products used in the first place, those made from them can be used sulfamic acids obtainable by / reduction with bisulfite or the acidylaminoarylacidyldiaminosulfonic acids, such as B. Acetylaminobenzoyl-p-phenylenediaminesulfonic acid use, the acetyl radical being split off after the coupling. Pate ν τ-Α ν SPEU c η:
Process for the preparation of developer dyes, which consists in coupling diazotized mononitro or acidylaminoarylacidyl derivatives of aromatic diaminesulfonic acids with the pyrazolones or pyrazolonecarboxylic acids obtainable from aromatic aminothiazole derivatives and reducing the nitro group or saponifying the acidylamino radical.