CH160675A - Process for the preparation of an azo dye. - Google Patents

Process for the preparation of an azo dye.

Info

Publication number
CH160675A
CH160675A CH160675DA CH160675A CH 160675 A CH160675 A CH 160675A CH 160675D A CH160675D A CH 160675DA CH 160675 A CH160675 A CH 160675A
Authority
CH
Switzerland
Prior art keywords
preparation
dye
nitrobenzene
azo dye
diazotized
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 CH160675A publication Critical patent/CH160675A/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

  

  Verfahren zur Darstellung eines     Azofarbstoües.       Gemäss dem Hauptpatent erhält man  einen     Azofarbstoff,    wenn man 1 .     3-Diamino-          4-nitrobenzol        mono,diazotiert    und mit einem  aus     diazotierter    1     .8-Aminonaphthol-3.        6-di-          sulfosäure    und     Resorcin    erhältlichen     Mono-          azofarbstoff    kuppelt.  



  Gegenstand der vorliegenden Erfindung  ist nun ein Zierfahren zur Herstellung eines       Azofarbstoffes,    welches dadurch gekenn  zeichnet ist,     da.ss    man 1 .     3-Diamino-4-nitro-          benzol        monodiazotiert,    mit 3 .     5-Dioxybenzol-          1-carbonsäure    kuppelt und den so -erhaltenen       31onoazofarbstoff    mit     diazotierter        1-Amino-          4-nitrobenzol-2-sulfosäure    behandelt.  



  <I>Beispiel:</I>  15,3 Teile     1.3-Diamino-4-nitrobenzol    wer  den, wie im Hauptpatent beschrieben,     diazo-          tiert    und 15,4 Teile 3 .     5-Dioxybenzol-l-car-          bonsäure    werden mit 5,3 Teilen Natriumkar  bonat in 500 Teilen Wasser gelöst. Unter  Kühlung gibt man die     Diazoverbindung    zu  der Lösung der     Resorcylcarbonsäure    in Ge  genwart eines Überschusses von Soda..

   Dann    werden 23,4 Teile     1-Amino-4-nitrobenzol-2-          sulfosäure    in     bekannter    Weise     diazotiert    und  zu dem vorher erhaltenen     Monoazofarbstoff     unter Kühlung hinzugegeben, wobei die Lö  sung weiter alkalisch gehalten wird. Der  Farbstoff     wird    in der üblichen Weise auf  gearbeitet. Er bildet trocken ein dunkelbrau  nes Pulver und färbt Leder in schönen gelb  braunen Tönen an.



  Process for the preparation of an azo color. According to the main patent, an azo dye is obtained if 1. 3-diamino-4-nitrobenzene mono, diazotized and with one of diazotized 1,8-aminonaphthol-3. 6-disulfonic acid and resorcinol available mono azo dye couples.



  The present invention now relates to a decorative process for the production of an azo dye, which is characterized in that 1. 3-diamino-4-nitrobenzene monodiazotized, with 3. Coupling 5-dioxybenzene-1-carboxylic acid and treating the 31onoazo dye thus obtained with diazotized 1-amino-4-nitrobenzene-2-sulfonic acid.



  <I> Example: </I> 15.3 parts of 1,3-diamino-4-nitrobenzene are diazoated as described in the main patent and 15.4 parts of 3. 5-Dioxybenzene-1-carboxylic acid is dissolved in 500 parts of water with 5.3 parts of sodium carbonate. With cooling, the diazo compound is added to the solution of the resorcylcarboxylic acid in the presence of an excess of soda.

   Then 23.4 parts of 1-amino-4-nitrobenzene-2-sulfonic 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 in beautiful yellow-brown tones.

Claims (1)

PATENTANSPRUCH: Verfahren zur Darstellung eines Azo- farbstoffes, dadurch gekennzeichnet, dass man 1 . 3-Diamino-4-nitrobenzol monodiazotiert, mit 3.5-Dioxybenzol-l-carbonsäure kuppelt und den so erhaltenen Monoazofarbstoff mit diazotierter 1-Amino-4-nitrobenzol - 2 - sulfo- säure behandelt. Der Farbstoff bildet trocken ein dunkelbraunes Pulver und färbt Leder in schönen gelbbraunen Tönen an. PATENT CLAIM: Process for the preparation of an azo dye, characterized in that 1. 3-diamino-4-nitrobenzene monodiazotized, coupled with 3,5-dioxybenzene-1-carboxylic acid and treated the monoazo dye thus obtained with diazotized 1-amino-4-nitrobenzene-2-sulfonic acid. The dye forms a dark brown powder when dry and colors leather in beautiful yellow-brown tones.
CH160675D 1931-11-30 1931-11-30 Process for the preparation of an azo dye. CH160675A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH160675T 1931-11-30
CH163182T 1931-11-30
CH157035T 1931-11-30

Publications (1)

Publication Number Publication Date
CH160675A true CH160675A (en) 1933-03-15

Family

ID=27177385

Family Applications (1)

Application Number Title Priority Date Filing Date
CH160675D CH160675A (en) 1931-11-30 1931-11-30 Process for the preparation of an azo dye.

Country Status (1)

Country Link
CH (1) CH160675A (en)

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