CH194360A - Process for the preparation of an azo dye. - Google Patents

Process for the preparation of an azo dye.

Info

Publication number
CH194360A
CH194360A CH194360DA CH194360A CH 194360 A CH194360 A CH 194360A CH 194360D A CH194360D A CH 194360DA CH 194360 A CH194360 A CH 194360A
Authority
CH
Switzerland
Prior art keywords
dye
preparation
azo dye
leather
compound
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 CH194360A publication Critical patent/CH194360A/en

Links

Description

  

  Verfahren zur Darstellung eines     Azofarbstoffes.       Nach dem im Hauptpatent     beschriebenen     Verfahren erhält man einen Leder in schönen  oliv-     bezw.        gelbstichig    havannabraunen Tö  nen anfärbenden Farbstoff, wenn man     4'-          Nitro-4-aminodiphenylamin-2'-sulfosäure        di-          azotiert,    die     Diazoverbindung    mit 1 .     2-Di-          oxybenzol        kuppelt,    dann die     Farbstofflösung     mit einem     Oxydationsmittel    nachbehandelt.

    



  Das vorliegende Patent stellt einen Farb  stoff unter     ;Schutz,    der erhalten wird, wenn  man     4'-Nitro-4-aminodiphenylamin-2'-sulfo-          säure        diazotiert,    die     Diazoverbindung    mit  1 . 2     .4-Trioxybenzol    kuppelt und dann den  erhaltenen Farbstoff in alkalischem Medium  mit einer     Verbindung    des zweiwertigen Kup  fers nachbehandelt.

           Beispiel:     30,9 Teile     4'-Nitro-4-aminodiphenylamin-          2'-sulfosäurewerden    in bekannter Weise     diazo-          tiert    und mit einer Lösung von 12,6 Teilen         1.2.4-Trioxybenzol    vereinigt, worauf die       Mineralsäure    mit     Natriumacetat    abgestumpft       und    die     Kupplung    durch mehrstündiges  Rühren bei 36 bis 40  C     beendet    wird.  



  Der so     erhaltene    Farbstoff wird dann in  alkalischer Lösung mit einer Lösung von,  25 Teilen     Kupfersulfat,    die gegebenenfalls  mit Ammoniak übersättigt ist, versetzt und  1     Stunde    bei     #80'        gerfihrt.    Danach wird wie  üblich     ausgesalzen.    Der Farbstoff färbt  Chromleder und vegetabilisch gegerbtes Leder  in     havannabraunen    Tönen an, die gute Echt  heitseigenschaften zeigen.



  Process for the preparation of an azo dye. The process described in the main patent gives a leather in beautiful olive or yellowish havana brown tones dye that dyes when 4'-nitro-4-aminodiphenylamine-2'-sulfonic acid is azotized the diazo compound with 1. 2-Dioxybenzene couples, then the dye solution is treated with an oxidizing agent.

    



  The present patent covers a dye; protection that is obtained when 4'-nitro-4-aminodiphenylamine-2'-sulfonic acid is diazotized, the diazo compound with 1. 2 .4-Trioxybenzol couples and then aftertreated the dye obtained in an alkaline medium with a compound of divalent copper.

           Example: 30.9 parts of 4'-nitro-4-aminodiphenylamine-2'-sulfonic acid are diazotized in a known manner and combined with a solution of 12.6 parts of 1,2,4-trioxybenzene, whereupon the mineral acid is truncated with sodium acetate and the coupling is ended by stirring at 36 to 40 ° C. for several hours.



  A solution of 25 parts of copper sulfate, which may be supersaturated with ammonia, is then added to the dyestuff obtained in this way in an alkaline solution and the mixture is stirred at 80 ° for 1 hour. Then salt out as usual. The dye stains chrome leather and vegetable-tanned leather in havana-brown tones, which show good fastness properties.

Claims (1)

PATENTANSPRUCH: Verfahren zur Darstellung eines Azofarb- stoffes, dadurch gekennzeichnet, dass man 4'- Nitro-4-aminodiphenylamin-2'-sulfos.äure di- azotiert, die Diazoverbindung mit<B>1.</B> 2. 4 Trioxybenzol kuppelt und .den erhaltenen Farbstoff in alkalischer Lösung mit einer Verbindung des zweiwertigen Kupfers nach behandelt. PATENT CLAIM: Process for the preparation of an azo dye, characterized in that 4'-nitro-4-aminodiphenylamine-2'-sulfonic acid is azotized and the diazo compound is diacotized with 1. 2. 4 trioxybenzene couples and .the obtained dye in an alkaline solution with a compound of divalent copper after treated. Der Farbstoff färbt Chromleder und vegetabilisch gegerbtes Leder in havanna- braunen Tönen an, die gute tchtheitseigen- schaften zeigen. The dye stains chrome leather and vegetable-tanned leather in havana brown tones, which show good fastness properties.
CH194360D 1935-07-27 1936-04-23 Process for the preparation of an azo dye. CH194360A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE194360X 1935-07-27
CH190722T 1936-04-23

Publications (1)

Publication Number Publication Date
CH194360A true CH194360A (en) 1937-11-30

Family

ID=25722038

Family Applications (1)

Application Number Title Priority Date Filing Date
CH194360D CH194360A (en) 1935-07-27 1936-04-23 Process for the preparation of an azo dye.

Country Status (1)

Country Link
CH (1) CH194360A (en)

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