CH201857A - Process for the preparation of an azo dye. - Google Patents

Process for the preparation of an azo dye.

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Publication number
CH201857A
CH201857A CH201857DA CH201857A CH 201857 A CH201857 A CH 201857A CH 201857D A CH201857D A CH 201857DA CH 201857 A CH201857 A CH 201857A
Authority
CH
Switzerland
Prior art keywords
azo dye
preparation
dye
diphenylamine
bromo
Prior art date
Application number
Other languages
German (de)
Inventor
Aktiengesellsc Farbenindustrie
Original Assignee
Ig Farbenindustrie Ag
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ig Farbenindustrie Ag filed Critical Ig Farbenindustrie Ag
Publication of CH201857A publication Critical patent/CH201857A/en

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Description

  

  Verfahren zur Herstellung eines     Azofar        bstofes.       Gemäss dem im Hauptpatent beschrie  benen Verfahren erhält man einen Leder in       braunen    Tönen färbenden     Azofarbstoff,    wenn  man     2-DIethyl-6-brom-4-nitro-l-aminobenzol          diazotiert    und die     Diazoverbindung        mit        Di-          phenylamin-2-carbon-2'-sulfosäure    kuppelt.  



  Wie     nun    weiter gefunden wurde, erhält  man einen     Farbstoff    von ganz ähnlichen Ei  genschaften, wenn     man.        2-Amino-3-brom-5-          nitro-l-benzylsulfosäure        diazotiert    und die       Diazoverbindung        mit        Diphenylamin-2-car-          bon-2'-sulfosäure    kuppelt.

      <I>Beispiel:</I>    311 Gewichtsteile 2 -     Amino    - 3 -     brom-5-          nitro-l-benzylsulfonsäure    werden in 1000 bis  3000 Teilen Wasser gelöst und wie üblich       diazotiert.    Die fertige     Diazolösung    wird all  mählich zu einer Lösung von 315 Gewichts-    teilen     Diphenylamin-2-carbon-2'-sulfonsäure     in etwa 5000 Teilen Wasser gegeben. Nach  längerem Rühren     wird    mit     Natriumhydr-          ogydlösung    neutralisiert und die Farbstoff  lösung durch Eindampfen zur Trockne ge  bracht.

   Chromkalbleder     wird    in sehr licht  echten,     braunen    Tönen gefärbt.



  Process for the production of an azo dye. According to the process described in the main patent, an azo dye that dyes leather in brown shades is obtained if 2-DIethyl-6-bromo-4-nitro-1-aminobenzene is diazotized and the diazo compound is treated with diphenylamine-2-carbon-2'- sulfonic acid couples.



  As has now been found further, one obtains a dye with very similar properties if one. 2-Amino-3-bromo-5-nitro-1-benzylsulfonic acid is diazotized and the diazo compound is coupled with diphenylamine-2-carbon-2'-sulfonic acid.

      <I> Example: </I> 311 parts by weight of 2 - amino - 3 - bromo-5-nitro-1-benzylsulfonic acid are dissolved in 1000 to 3000 parts of water and diazotized as usual. The finished diazo solution is gradually added to a solution of 315 parts by weight of diphenylamine-2-carbon-2'-sulfonic acid in about 5000 parts of water. After prolonged stirring, it is neutralized with sodium hydride solution and the dye solution is brought to dryness by evaporation.

   Chrome calf leather is dyed in very light, real, brown tones.

Claims (1)

PATENTANSPRUCH: Verfahren zur Herstellung eines Azofarb- stoffes, dadurch gekennzeichnet, dass man 2- Amino-3-brom-5-nitro-l-benzylsulfosäure di- azotiert und die Diazoverbindung mit Di- phenylamin-2-carbon-2'-sulfosäure kuppelt. Der so erhaltene Farbstoff färbt Chromkalb leder in sehr lichtechten, braunen Tönen. PATENT CLAIM: Process for the production of an azo dye, characterized in that 2-amino-3-bromo-5-nitro-1-benzylsulfonic acid is azotized and the diazo compound is coupled with diphenylamine-2-carbon-2'-sulfonic acid . The dye obtained in this way dyes chrome calf leather in very lightfast, brown tones.
CH201857D 1936-08-26 1937-05-14 Process for the preparation of an azo dye. CH201857A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201857X 1936-08-26
CH198711T 1938-07-15

Publications (1)

Publication Number Publication Date
CH201857A true CH201857A (en) 1938-12-15

Family

ID=25723122

Family Applications (1)

Application Number Title Priority Date Filing Date
CH201857D CH201857A (en) 1936-08-26 1937-05-14 Process for the preparation of an azo dye.

Country Status (1)

Country Link
CH (1) CH201857A (en)

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