CH167391A - Process for the preparation of an azo dye. - Google Patents

Process for the preparation of an azo dye.

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Publication number
CH167391A
CH167391A CH167391DA CH167391A CH 167391 A CH167391 A CH 167391A CH 167391D A CH167391D A CH 167391DA CH 167391 A CH167391 A CH 167391A
Authority
CH
Switzerland
Prior art keywords
preparation
azo dye
sulfonic acid
dye
oxynaphthyl
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 CH167391A publication Critical patent/CH167391A/en

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Description

  

  Verfahren     zur    Darstellung eines     AzofarbstofFes.       Gemäss dem im Hauptpatent beschriebenen  Verfahren wird ein Leder in saurem Bade  anfärbender     Azofarbstoff    erhalten, wenn man       4'-    N     itrophenyl    - b -     oxynaphthyl-1.        2-triazol-7-          sulfosäure    mit     diazotierter        4-Aminoazobenzol-          4'-sulfosäure    in alkalischem Bade kuppelt.  



  Wie nun weiter gefunden wurde, erhält  man einen Farbstoff mit ganz ähnlichen  Eigenschaften, wenn man als     Azokomponente     die     4'-Nitropherryl-8-oxynaphthyl-1.2-triazol-          6-sulfosäure    wählt.  



  <I>Beispiel:</I>  27,7 Teile     4-Aminoazobenzol-4'-sulfosäure     werden in bekannter Weise     diazotiert    und  mit einer kalten     sodaalkalisch        gehaltenen     Lösung von 40,8 Teilen     4'-nitrophenyl-8-          oxynaphthyl-1.2-triazol-6-sulfosarrr,ern    Na  trium der Formel  
EMI0001.0021     
    vereinigt.  Nach beendeter Kupplung wird mit Kochsalz       abgeschiedeu    und der Farbstoff in üblicher  Weise aufgearbeitet. Er färbt Chromleder und  vegetabilisch gegerbtes Leder in schönen rot  braunen Tönen von guter Lichtechtheit an.



  Process for the preparation of an azo dye. According to the process described in the main patent, an azo dye which dyes leather in an acid bath is obtained if 4'-nitrophenyl-b-oxynaphthyl-1. 2-triazole-7-sulfonic acid couples with diazotized 4-aminoazobenzene-4'-sulfonic acid in an alkaline bath.



  As has now been further found, a dye with very similar properties is obtained if 4'-nitropherryl-8-oxynaphthyl-1,2-triazole-6-sulfonic acid is chosen as the azo component.



  <I> Example: </I> 27.7 parts of 4-aminoazobenzene-4'-sulfonic acid are diazotized in a known manner and treated with a cold solution of 40.8 parts of 4'-nitrophenyl-8-oxynaphthyl-1,2-triazole which is kept alkaline with soda -6-sulfosarrr, ern sodium of the formula
EMI0001.0021
    united. When the coupling is complete, it is separated off with common salt and the dye is worked up in the usual way. It stains chrome leather and vegetable-tanned leather in beautiful red-brown shades of good lightfastness.

Claims (1)

PATENTANSPRUCH: Verfahren zur Darstellung eines Azofarb- stoffes, dadurch gekennzeichnet, dass man 4'- Nitrophenyl - 8 - oxynaphthyl-1. 2-triazol-6- sulfosäure in alkalischem Bad mit diazotierter 4-Aminoazobenzol-4'-sulfosäure kuppelt. Der Farbstoff färbt Chromleder und vegetabiliscb gegerbtes Leder in rotbraunen, lichtechten Tönen an. PATENT CLAIM: Process for the preparation of an azo dye, characterized in that 4'-nitrophenyl-8-oxynaphthyl-1. Coupling 2-triazole-6-sulfonic acid in an alkaline bath with diazotized 4-aminoazobenzene-4'-sulfonic acid. The dye stains chrome leather and vegetable-tanned leather in red-brown, lightfast shades.
CH167391D 1932-02-15 1932-11-04 Process for the preparation of an azo dye. CH167391A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE167391X 1932-02-15
CH164547T 1933-10-15

Publications (1)

Publication Number Publication Date
CH167391A true CH167391A (en) 1934-02-15

Family

ID=25717973

Family Applications (1)

Application Number Title Priority Date Filing Date
CH167391D CH167391A (en) 1932-02-15 1932-11-04 Process for the preparation of an azo dye.

Country Status (1)

Country Link
CH (1) CH167391A (en)

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