CH194666A - Process for the preparation of a leather dye. - Google Patents

Process for the preparation of a leather dye.

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Publication number
CH194666A
CH194666A CH194666DA CH194666A CH 194666 A CH194666 A CH 194666A CH 194666D A CH194666D A CH 194666DA CH 194666 A CH194666 A CH 194666A
Authority
CH
Switzerland
Prior art keywords
dye
leather
preparation
leather dye
main
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 CH194666A publication Critical patent/CH194666A/en

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Description

  

  Verfahren zur Herstellung eines     Lederfarbstoffes.       Nach dem im schweizerischen Haupt  patent     Nr.189871    beschriebenen.     Verfahren     erhält man einen     Leder    in echten Tönen an  färbenden Farbstoff,     wenn    man     4'-Nitro-          4-aminodiph.enylamin-2'-sufosäure        diazotiert     und die     Diazoverbin.dung    mit 1.

       2-Ogybenzol     kuppelt, dass man weiterhin     4-Nitro-l-amino-          benzol        diazotiert    und diese     Diazoverbindung     mit dem     vorgängig        erhaltenen        Monoazofarb-          stoff        weiterkuppelt.     



  Wie nun weiter     gefunden:    wurde, kann  man den so erhaltenen Farbstoff     in    seinen       Eigenschaften        verbessern,        wenn    man     ihn        in.          wä.ssriger    alkalischer Lösung mit Verbindun  gen des zweiwertigen Kupfers nachbehandelt.

      <I>Beispiel:</I>    In die gemäss dem     Beispiel    des     Haupt-          patentes    Nr. 189871 erhaltene Farbstoff  lösung lässt     man    unter     Erwärmen    bei Gegen  wart von überschüssiger Soda oder     bei    Ge  genwart von     Ammoniak    eine     Lösung    von 50         Teilen        krist.    Kupfersulfat zulaufen.

   Der  Farbstoff     wird    dann in der üblichen Weise       ausgesalzen.    Er färbt Chromleder und vege  tabilisch gegerbtes Leder     in        etwas        gedeckte-          ren,        in    den     Echtheiten:        verbesserten    Tönen  an, als der Ausgangsfarbstoff.



  Process for the preparation of a leather dye. According to the one described in the main Swiss patent number 189871. In the process, leather is obtained in real shades of dyestuff if 4'-nitro-4-aminodiph.enylamine-2'-sulfonic acid is diazotized and the diazo compound with 1.

       2-Ogybenzene is coupled by further diazotizing 4-nitro-1-aminobenzene and coupling this diazo compound with the previously obtained monoazo dye.



  As has now also been found, the properties of the dye thus obtained can be improved if it is aftertreated in an aqueous alkaline solution with compounds of divalent copper.

      <I> Example: </I> In the dye solution obtained according to the example of the main patent no. 189871, a solution of 50 parts of crystalline is allowed to form under heating in the presence of excess soda or in the presence of ammonia. Copper sulphate.

   The dye is then salted out in the usual way. It dyes chrome leather and vegetable tanned leather in slightly more muted, fastness: better shades than the original dye.

Claims (1)

PATENTANSPRUCH: Verfahren zur Herstellung eines Leder-- f arbstoffes,dadurch ; PATENT CLAIM: Process for the production of a leather dye, thereby; gekennzeichnet, dass man den nach dem Verfahren. gemäss! Patent anspruch des schweizerischen Hauptpatentes Nr.189871 erhaltenen Farbstoff in aäkali- schem Medium mit Verbindungen des zwei wertigem Kupfers behandelt. Der erhaltene Farbstoff färbt Chromleder und vegetabilisch gegerbtes Leder in etwas gedeckteren, characterized in that one after the process. according to! Patent claim of the main Swiss patent No. 189871 treated in an alkaline medium with compounds of the bivalent copper. The dye obtained dyes chrome leather and vegetable-tanned leather in a more muted, in den Echtheiten verbesserten Tönen an, als der Ausgangsfarbstoff. tones with improved fastness properties than the starting dye.
CH194666D 1934-12-21 1935-09-12 Process for the preparation of a leather dye. CH194666A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE194666X 1934-12-21
DE160235X 1935-02-16
DE200735X 1935-07-20
CH193082T 1935-09-12

Publications (1)

Publication Number Publication Date
CH194666A true CH194666A (en) 1937-12-15

Family

ID=27429696

Family Applications (1)

Application Number Title Priority Date Filing Date
CH194666D CH194666A (en) 1934-12-21 1935-09-12 Process for the preparation of a leather dye.

Country Status (1)

Country Link
CH (1) CH194666A (en)

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