CH172616A - Process for the preparation of an azo dye. - Google Patents

Process for the preparation of an azo dye.

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Publication number
CH172616A
CH172616A CH172616DA CH172616A CH 172616 A CH172616 A CH 172616A CH 172616D A CH172616D A CH 172616DA CH 172616 A CH172616 A CH 172616A
Authority
CH
Switzerland
Prior art keywords
azo dye
diazotized
dye
preparation
coupling
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 CH172616A publication Critical patent/CH172616A/en

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Description

  

  Verfahren zur     Zierstellung    eines     Azofarbstoffes.       Gemäss dem im     Hauptpatent        besehriebe-          nen        Verfahren    erhält man einen wertvollen       Azofarbstoff,    wenn man I     Mol        1-Amino-8-          oxy        naphtlialiir    - 3. 6 -     disulfosäure        diazotiert,     die     Diazoverbindung    mit 1     1lol    1..

       3-Dioxy-          l,enzol    in     alkalise.her    Lösung kuppelt und den       #_-o    erhaltenen     -2#lonoazofarbsto-ff    mit 2     Mol          rliazotiertem        ?-Nitro-1        .4-dia,minobenzol        wei-          tur    kuppelt.  



  Wie nun weiter gefunden wurde, erhält  man einen Leder     dunkelrotbraun    anfärbenden  Farbstoff, wenn     man    den aus     diazotierter     1-     Arnino-R-oxynaphthalin-4    .     6-disulfosäure     durch Kuppeln mit     Resorein    erhältlichen       Monoazofarbstoff        finit    2     Mol        diazotiertem          _'-Nitro-1.4-diaminobenzol    weiter kuppelt.

         Bei,späel:          -1f,4    Teile des aus     diazotierter        1-Amino-          8-oxyrta.plithalin-4.        (i-disulfosäure    und Kup  peln mit     Resorcin    erhaltenen     Monoazofarb-          stoffewerden    in 1000 Teilen     Wasser    unter  Zusatz von 8 Teilen     Natriumhydroxyd        gelöst.     38 Teile salzsaures<B>2</B> -     Nitro    - 1 .

       .1-    diamino-         benzol    werden in der üblichen Weise     diazo-          tiert.    Die Lösung der     Diazoverbindung    läuft  bei 10   zu der des     Monoazofarbstoffes    gleich  zeitig     niit    6 Teilen     Natriumhydrogyd,    gelöst  in 100 Teilen Wasser. Nach beendeter Kupp  lung wird wie üblich aufgearbeitet. Der       Farbstoff    bildet ein dunkles Pulver, er färbt  Leder     dunkelrotbraun    an.



  Process for the decoration of an azo dye. According to the process described in the main patent, a valuable azo dye is obtained if 1 mole of 1-amino-8-oxy naphthalene-3, 6-disulfonic acid is diazotized, the diazo compound with 1 lol 1 ..

       Coupling 3-dioxylene, enzene in alkaline.her solution and coupling the # _- o obtained -2 # lonoazo dye with 2 mol of rliazotized? -Nitro-1,4-dia, minobenzene white.



  As has now also been found, a dye which stains leather dark red-brown is obtained if the diazotized 1-amino-R-oxynaphthalene-4. 6-disulfonic acid, obtainable by coupling with resorein, finitely 2 moles of diazotized _'-nitro-1,4-diaminobenzene further couples.

         At, späel: -1f, 4 parts of the 1-amino-8-oxyrta.plithalin-4 diazotized from. (i-Disulfonic acid and monoazo dyes obtained from couplings with resorcinol are dissolved in 1000 parts of water with the addition of 8 parts of sodium hydroxide. 38 parts of hydrochloric acid 2 - nitro - 1.

       .1-diamino-benzene are diazo- tated in the usual way. The solution of the diazo compound runs at 10 to that of the monoazo dye at the same time niit 6 parts of sodium hydrogen dissolved in 100 parts of water. After the coupling has ended, work-up is carried out as usual. The dye forms a dark powder, it stains leather dark red-brown.

 

Claims (1)

PATENTANSPRUCH:- Verfahren zur Herstellung eines Azofarb- stoffes,,dadurch gekennzeichnet, dass man den aus diazotierter 1-Amino-8-oxynaphthalin- 4. G-disulfosäure durch Kuppeln mit Resor- cin erhältlichen Monoazofarbstoff mit 2 Mol diazotiertem 2-Nitro-1 . 4-diaminobenzol wei ter kuppelt. PATENT CLAIM: Process for the production of an azo dye, characterized in that the monoazo dye obtainable from diazotized 1-amino-8-oxynaphthalene-4. G-disulfonic acid by coupling with resorcinol with 2 moles of diazotized 2-nitro-1 . 4-diaminobenzene continues to couple. Der erhaltene Azofarbstoff bildet ein dunkles Pulver und färbt Leder dunkelrot braun an. The azo dye obtained forms a dark powder and stains leather in a dark red brown.
CH172616D 1932-07-07 1933-04-27 Process for the preparation of an azo dye. CH172616A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE172616X 1932-07-07
CH170089T 1934-04-09

Publications (1)

Publication Number Publication Date
CH172616A true CH172616A (en) 1934-10-15

Family

ID=25718856

Family Applications (1)

Application Number Title Priority Date Filing Date
CH172616D CH172616A (en) 1932-07-07 1933-04-27 Process for the preparation of an azo dye.

Country Status (1)

Country Link
CH (1) CH172616A (en)

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