CH201860A - Process for the preparation of an azo dye. - Google Patents

Process for the preparation of an azo dye.

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Publication number
CH201860A
CH201860A CH201860DA CH201860A CH 201860 A CH201860 A CH 201860A CH 201860D A CH201860D A CH 201860DA CH 201860 A CH201860 A CH 201860A
Authority
CH
Switzerland
Prior art keywords
azo dye
preparation
dye
diazotized
sulfonic acid
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 CH201860A publication Critical patent/CH201860A/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     2-3Zethyl-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     2-Methyl-6-chlor-          4-nitranilin        diazotiert        und    die     Diazoverbin-          dung        mit        p-Acetaminodiphenylamin-o-sulfo-          säure    kuppelt.  



  <I>Beispiel:</I>  186,5 Teile     2-Methyl-6-chlor-4-nitranilin     werden     in    üblicher Weise mittels     Nitrosyl-          sehwefelsäure        diazotiert.    Die wässerige     Di-          azolösung    wird nicht zu rasch zu einer Lö  sung von 328     Teilen    des     Natriumsalzes    der       p-Acetaminodiphenylamin-o-sulfosäure    gege-         ben.    Nach längerem Rühren     wird    der Farb  stoff     ausgesalzen,        filtriert,    gewaschen,

       in    das       Natriumsalz    übergeführt und     getrocknet.    Er  ist ein dunkles Pulver, welches Leder in       braunen    Tönen von sehr guten Echtheits  eigenschaften färbt.



  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 2-3zethyl-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 also been found, an azo dye with very similar properties is obtained if 2-methyl-6-chloro-4-nitroaniline is diazotized and the diazo compound is coupled with p-acetaminodiphenylamine-o-sulfonic acid.



  <I> Example: </I> 186.5 parts of 2-methyl-6-chloro-4-nitroaniline are diazotized in the customary manner using nitrosylsulfuric acid. The aqueous diazole solution is not added too quickly to a solution of 328 parts of the sodium salt of p-acetaminodiphenylamine-o-sulfonic acid. After prolonged stirring, the dye is salted out, filtered, washed,

       converted into the sodium salt and dried. It is a dark powder which dyes leather in brown tones with very good fastness properties.

Claims (1)

PATENTANSPRUCH: Verfahren zur Herstellung eines Azofarb- stoffes, dadurch gekennzeichnet, dass man 2 Methyl-6-chlor-4-nitranilin diazotiert und die Diazoverbindung mit p-Acetaminodiphenyl- amin-o-sulfosäure kuppelt. Der so erhaltene Farbstoff bildet ein dunkles Pulver, welches Leder in braunen Tönen von sehr guten Echt heitseigenschaften färbt. PATENT CLAIM: Process for the production of an azo dye, characterized in that 2-methyl-6-chloro-4-nitroaniline is diazotized and the diazo compound is coupled with p-acetaminodiphenylamine-o-sulfonic acid. The dye thus obtained forms a dark powder which dyes leather in brown tones with very good authenticity properties.
CH201860D 1936-08-26 1937-05-14 Process for the preparation of an azo dye. CH201860A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201860X 1936-08-26
CH198711T 1938-07-15

Publications (1)

Publication Number Publication Date
CH201860A true CH201860A (en) 1938-12-15

Family

ID=25723125

Family Applications (1)

Application Number Title Priority Date Filing Date
CH201860D CH201860A (en) 1936-08-26 1937-05-14 Process for the preparation of an azo dye.

Country Status (1)

Country Link
CH (1) CH201860A (en)

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