CH201861A - Process for the preparation of an azo dye. - Google Patents

Process for the preparation of an azo dye.

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Publication number
CH201861A
CH201861A CH201861DA CH201861A CH 201861 A CH201861 A CH 201861A CH 201861D A CH201861D A CH 201861DA CH 201861 A CH201861 A CH 201861A
Authority
CH
Switzerland
Prior art keywords
azo dye
preparation
dye
bromo
nitro
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 CH201861A publication Critical patent/CH201861A/en

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Description

  

  Verfahren zur Herstellung eines     Azofarbstoffes.       Gemäss dem im Hauptpatent beschrie  benen Verfahren erhält man einen Leder in  braunen Tönen färbenden     Azofarbstoff,        wenn     man     2-Methyl-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     Azofarbstoff    von ganz ähnlichen  Eigenschaften,     wenn    man     1-Amino-4-nitro-          6-brom-2-benzylsulfosäure        diazotiert    und die       Diazoverbindung    mit     p-Acetaminodiphenyl-          amin-o-sulfosäure    kuppelt.

      <I>Beispiel:</I>         333    Teile des     Natriumsalzes    der     1-Amino-          4-nitro-6-brom-2-benzylsulfosäure    werden in  üblicher     Weise        diazotiert    und die     fertige        Di-          azolösung    wird langsam zu einer Lösung von  <B>328</B> Teilen des     Natriumsalzes    der p-Acet-         aminodiphenylamin    - o -     sulfosäure    gegeben.

    Nach     beendeter    Kupplung     wird    die     Lösung     des Farbstoffes mit Natronlauge neutrali  siert und bei etwa 40 bis 50   im Vakuum  getrocknet. Der erhaltene Farbstoff zeichnet  sich durch grosse Löslichkeit, schöne braune  Nuancen und gute Echtheitseigenschaften  aus.



  Process for the preparation of an azo dye. According to the process described in the main patent, an azo dye which dyes leather in brown shades is obtained if 2-methyl-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, an azo dye with very similar properties is obtained if 1-amino-4-nitro-6-bromo-2-benzylsulfonic acid is diazotized and the diazo compound is coupled with p-acetaminodiphenylamine-o-sulfonic acid.

      <I> Example: </I> 333 parts of the sodium salt of 1-amino-4-nitro-6-bromo-2-benzylsulphonic acid are diazotized in the usual way and the finished diazole solution slowly becomes a solution of 328 </B> Parts of the sodium salt of p-acetaminodiphenylamine - o - sulfonic acid are given.

    After the coupling has ended, the solution of the dye is neutralized with sodium hydroxide solution and dried at about 40 to 50 in vacuo. The dye obtained is characterized by high solubility, beautiful brown nuances and good fastness properties.

Claims (1)

PATENTANSPRUCH: Verfahren zur Herstellung eines Azofarb- stoffes, dadurch gekennzeichnet, dass man 1- Amino-4-nitro-6-brom-2-benzylsulfosäure di- azotiert und die Diazoverbindung mit p-Acet- aminodiphenylamin-o-sulfosäure kuppelt. Der erhaltene Farbstoff zeichnet sich durch grosse Löslichkeit, schöne braune Nuancen und gute Echtheitseigenschaften aus. PATENT CLAIM: A process for the production of an azo dye, characterized in that 1-amino-4-nitro-6-bromo-2-benzylsulfonic acid is azotized and the diazo compound is coupled with p-acetaminodiphenylamine-o-sulfonic acid. The dye obtained is characterized by high solubility, beautiful brown nuances and good fastness properties.
CH201861D 1936-08-26 1937-05-14 Process for the preparation of an azo dye. CH201861A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201861X 1936-08-26
CH198711T 1938-07-15

Publications (1)

Publication Number Publication Date
CH201861A true CH201861A (en) 1938-12-15

Family

ID=25723126

Family Applications (1)

Application Number Title Priority Date Filing Date
CH201861D CH201861A (en) 1936-08-26 1937-05-14 Process for the preparation of an azo dye.

Country Status (1)

Country Link
CH (1) CH201861A (en)

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