CH199970A - Process for the preparation of an azo dye. - Google Patents

Process for the preparation of an azo dye.

Info

Publication number
CH199970A
CH199970A CH199970DA CH199970A CH 199970 A CH199970 A CH 199970A CH 199970D A CH199970D A CH 199970DA CH 199970 A CH199970 A CH 199970A
Authority
CH
Switzerland
Prior art keywords
dye
nitro
amino
leather
coupled
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 CH199970A publication Critical patent/CH199970A/en

Links

Description

  

  Verfahren zur Herstellung eines     Azofarbstoffes.       Nach dem im Hauptpatent     beschriebenen     Verfahren erhält man einen     Leder    in klar  rotbraunen Tönen von vorzüglicher Echtheit  anfärbenden Farbstoff,     wenn    man     diazo-          tierte        1-Amino-8-ogynaphthalin-3.6-disulfo-          säure    mit 1.

       3-Diogybenzol    kuppelt,     den    so  erhaltenen     Monoazofarbstoff    mit     diazotier-          tem        4-Nitro-2-amino-l-ogybenzol        behandelt     und     schliesslich    den     dann        erhaltenen,        Disazo-          farbstoff    in     alkalischem    Medium in die       Kupferverhindung        überführt.     



  Wie nun weitergefunden wurde, erhält  man einen Farbstoff von     ähnlichen    Eigen  schaften,     wenn    man den nach dem Haupt  patent erhältlichen     Disazofarbstoff    mit     di-          azotierter        4'-Nitro-4-aminodiphenylamin-2'-          sulfosäure        weiter    behandelt und dann in die       Kupferverbindung        überführt.     



  <I>Beispiel:</I>  34,1 Teile     1-Amino-8-ogynaphthalin-,3i.        6-          @disulfosäure    (saures     Na-Salz)    werden in be-         kannter        Weise        diazotiert    und mit einer alka  lisch gehaltenen Lösung von 11 Teilen 1.     3-          Diogybenzol    vereinigt.

   Zu dem     Monoazofarb-          stoff    lässt man     ebenfalls.    in alkalisch gehal  tenem     Medium:    eine aus 15,4     Teilen        4-Nitro-          2-amino-l-ogybenzol    bereitete     Diazoverbin-          dung    hinzulaufen. Dann bereitet man aus  30,9 Teilen     4'-Nitro-4-aminodiphenylamin-2'-          sulfosäure    die     Diazoverbindung    und gibt sie  in, die alkalisch gehaltene Lösung des vor  gängig erhaltenen Farbstoffes.

   Nach beende  ter Kupplung wird der so erhaltene Farb  stoff in alkalischem Medium mit 50 Teilen  Kupfersulfat erwärmt. Er färbt Chromleder  und     vegetabilisch    gegerbtes Leder in braunen  Tönen von     guter    Echtheit.



  Process for the preparation of an azo dye. According to the process described in the main patent, a leather in clear red-brown shades of excellent fastness-dyeing dye is obtained if diazotized 1-amino-8-ogynaphthalene-3,6-disulfonic acid is mixed with 1.

       3-Diogybenzene is coupled, the monoazo dye thus obtained is treated with diazotized 4-nitro-2-amino-1-ogybenzene and finally the disazo dye obtained is converted into the copper compound in an alkaline medium.



  As has now been found, a dye with similar properties is obtained if the disazo dye obtainable according to the main patent is treated further with diazotized 4'-nitro-4-aminodiphenylamine-2'-sulfonic acid and then converted into the copper compound.



  <I> Example: </I> 34.1 parts of 1-amino-8-ogynaphthalene-, 3i. 6- @ disulfonic acid (acidic sodium salt) are diazotized in a known manner and combined with an alkaline solution of 11 parts of 1,3-diogybenzene.

   The monoazo dye is also allowed. in an alkaline medium: a diazo compound prepared from 15.4 parts of 4-nitro-2-amino-1-ogybenzene is added. The diazo compound is then prepared from 30.9 parts of 4'-nitro-4-aminodiphenylamine-2'-sulfonic acid and is added to the alkaline solution of the dye previously obtained.

   After the coupling has ended, the dye thus obtained is heated in an alkaline medium with 50 parts of copper sulfate. It dyes chrome leather and vegetable tanned leather in brown shades of good fastness.

Claims (1)

PATENTANSPRUCH: Verfahren zur Herstellung eines zur Fär bung von Leder besonders geeigneten Farb stoffes, dadurch ,gekennzeichnet, dass man 1-Amino-8 -ogynaphthalin-,3 . PATENT CLAIM: A process for the production of a dye material particularly suitable for dyeing leather, characterized in that 1-amino-8 -ogynaphthalene, 3. 6 -,disulfasäure dianotiert, die Diazoverbindung mit 1.3 Diogybenzol kuppelt, dass man 4-Nitro-2- amino-l-ogybenzol dianotiert und mit dem vorgängig erhaltenen Monoazofarbstoff kup pelt, 6 -, disulfic acid dianotized, the diazo compound is coupled with 1.3 diogybenzene, that 4-nitro-2-amino-l-ogybenzene is dianotated and coupled with the previously obtained monoazo dye, dass man weiter 4'-Nitro-4-amino- diphenylamin-2'-sulfosäure dianotiert und auf den erhaltenen Disazofarbstoff einwir- ken lässt und schliesslich den so erhaltenen Farbstoff in alkalischem Medium in che Kupferverbindung überführt. Der Farbstoff färbt Chromleder und vegetabilisch that 4'-nitro-4-aminodiphenylamine-2'-sulfonic acid is further dianotized and allowed to act on the disazo dye obtained, and finally the dye thus obtained is converted into a copper compound in an alkaline medium. The dye dyes chrome leather and vegetal gegerbtes Leder in braunen Tönen von guter Echtheit. tanned leather in brown tones of good authenticity.
CH199970D 1936-07-02 1937-05-08 Process for the preparation of an azo dye. CH199970A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE199970X 1936-07-02
CH198141T 1937-05-08

Publications (1)

Publication Number Publication Date
CH199970A true CH199970A (en) 1938-09-15

Family

ID=25723080

Family Applications (1)

Application Number Title Priority Date Filing Date
CH199970D CH199970A (en) 1936-07-02 1937-05-08 Process for the preparation of an azo dye.

Country Status (1)

Country Link
CH (1) CH199970A (en)

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