CH160676A - Process for the preparation of an azo dye. - Google Patents

Process for the preparation of an azo dye.

Info

Publication number
CH160676A
CH160676A CH160676DA CH160676A CH 160676 A CH160676 A CH 160676A CH 160676D A CH160676D A CH 160676DA CH 160676 A CH160676 A CH 160676A
Authority
CH
Switzerland
Prior art keywords
azo dye
preparation
dye
diazotized
nitrobenzene
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 CH160676A publication Critical patent/CH160676A/en

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
    • C09B33/00—Disazo and polyazo dyes of the types A->K<-B, A->B->K<-C, or the like, prepared by diazotising and coupling
    • C09B33/02—Disazo dyes
    • C09B33/04—Disazo dyes in which the coupling component is a dihydroxy or polyhydroxy compound

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Coloring (AREA)

Description

  

      Zusatzpatent    zum Hauptpatent Nr. 157035.    Verfahren zur Darstellung eines     Azofarbstoffes.       Gemäss dem Hauptpatent erhielt     mar,     einen     Azofarbstoff,    wenn man 1.     3-Diamino-          4-nitrobenzol        monodiazotiert    und mit einem  aus     diazotierter   <B>1.</B>     8-Aminonaphthol-3.        6-di-          sulfosäure    und     Resorcin    erhältlichen     Mono-          azofarbstoff    kuppelt.  



  Gegenstand der vorliegenden Erfindung  ist nun ein Verfahren zur Herstellung eines       Azofarbstoffes,    welches dadurch gekenn  zeichnet ist,     dass    man 1.     3-Diamino-4-nitro-          benzol        monodiazotiert,    mit 2.     4-Dioxybenzol-          l-earbonsäure    kuppelt und den so erhaltenen       Monoazofarbstoff    mit     diazotierter        Pikramin-          säure    behandelt.  



  <I>Beispiel:</I>  15,3 Teile     1.3-Diamino-4-nitrobenzol    wer  den, wie im Hauptpatent beschrieben,     mono-          diazotiert    und 15,4 Teile     2.4-Dioxybenzol-          1-carbonsäure    werden mit 5,3 Teilen Na  triumkarbonat in 500 Teilen Wasser gelöst.  Unter Kühlung gibt man die     Diazoverbin-          dung    zu der Lösung der     Resoreylcarbonsäure     in Gegenwart eines Überschusses von Soda.

      Dann werden 19,9 Teile     Pikraminsäure    in  bekannter Weise     -diazotiert    und zu dem vor  her erhaltenen     Monoazofarbstoff    unter Küh  lung hinzugegeben, wobei die Lösung     weiter     alkalisch gehalten wird.  



  Der Farbstoff wird in der üblichen Weise  aufgearbeitet. Er bildet trocken ein dunkel  braunes Pulver und färbt Leder voll braun an.



      Additional patent to main patent No. 157035. Process for the preparation of an azo dye. According to the main patent, mar, an azo dye, was obtained if 1. 3-diamino-4-nitrobenzene was monodiazotized and a diazotized 1. 8-aminonaphthol-3. 6-disulfonic acid and resorcinol available mono azo dye couples.



  The present invention now relates to a process for producing an azo dye, which is characterized in that 1. 3-diamino-4-nitrobenzene is monodiazotized, coupled with 2. 4-dioxybenzene-1-carboxylic acid and the monoazo dye thus obtained treated with diazotized picric acid.



  <I> Example: </I> 15.3 parts of 1,3-diamino-4-nitrobenzene who, as described in the main patent, are monodiazotized and 15.4 parts of 2,4-dioxybenzene-1-carboxylic acid are mixed with 5.3 parts of Na trium carbonate dissolved in 500 parts of water. With cooling, the diazo compound is added to the solution of the resoreyl carboxylic acid in the presence of an excess of soda.

      Then 19.9 parts of picric acid are -diazotized in a known manner and added to the previously obtained monoazo dye with cooling, the solution being kept alkaline.



  The dye is worked up in the usual way. When dry, it forms a dark brown powder and stains leather completely brown.

Claims (1)

PATENTANSPRUCH: Verfahren zur Darstellung eines Azo- farbstoffes, dadurch gekennzeichnet, dass man 1.3-Diamino-4-nitrobenzol monodiazo- tiert, mit 2.4-Dioxybenzol-l-carbonsäure kuppelt und den so erhaltenen Monoazofarb- stoff mit diazotierter Pikraminsäure behan delt. Der Farbstoff bildet trocken ein dunkel braunes Pulver und färbt Leder in vollbrau nen Tönen an. Claim: Process for the preparation of an azo dye, characterized in that 1,3-diamino-4-nitrobenzene is monodiazo- tated, coupled with 2,4-dioxybenzene-1-carboxylic acid and the monoazo dye thus obtained is treated with diazotized picric acid. The dye forms a dark brown powder when dry and stains leather in full brown tones.
CH160676D 1931-11-30 1931-11-30 Process for the preparation of an azo dye. CH160676A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH160676T 1931-11-30
CH157035T 1931-11-30
CH163182T 1931-11-30

Publications (1)

Publication Number Publication Date
CH160676A true CH160676A (en) 1933-03-15

Family

ID=27177386

Family Applications (1)

Application Number Title Priority Date Filing Date
CH160676D CH160676A (en) 1931-11-30 1931-11-30 Process for the preparation of an azo dye.

Country Status (1)

Country Link
CH (1) CH160676A (en)

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