CH193082A - Process for the preparation of a leather dye. - Google Patents

Process for the preparation of a leather dye.

Info

Publication number
CH193082A
CH193082A CH193082DA CH193082A CH 193082 A CH193082 A CH 193082A CH 193082D A CH193082D A CH 193082DA CH 193082 A CH193082 A CH 193082A
Authority
CH
Switzerland
Prior art keywords
dye
leather
preparation
leather dye
air
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 CH193082A publication Critical patent/CH193082A/en

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Landscapes

  • Coloring (AREA)
  • Treatment And Processing Of Natural Fur Or Leather (AREA)

Description

  

  Verfahren zur Herstellung eines     Lederfarbstoffes.       Nach dem im schweizerischen Haupt  patent Nr. 1.89871 beschriebenen Verfahren  erhält man einen Leder in echten Tönen an  färbenden Farbstoff, wenn man     4'-Nitro-4-          aminodiphenylamin-2'-sulfosäure        diazotiert,     die     Diazoverbindung    mit     1,2-Dioxybenzol     kuppelt,

   dass man ferner     4-Nitro-l-aminoben-          zol        diazotiert    und die     Diazoverbindung    mit  dem     vorgängig    erhaltenen     Monoazofarbstoff          weiterkuppelt.     



  Wie nun weiter .gefunden wurde, kann  man den so erhaltenen Farbstoff in einen       etwas        gelbstichigeren    verwandeln, wenn man  ihn mit einem gelinde wirkenden     Oxydations-          mittel,    vorzugsweise Luft, behandelt.  



  <I>Beispiel:</I>  Durch eine wässerige Lösung des nach  dem Hauptpatent Nr. 189871 erhaltenen  Farbstoffes     leitet    man unter Erwärmen meh  rere     Stunden    lang einen     Luftstrom.    Der wie  der abgeschiedene Farbstoff färbt Chrom-    Leder und vegetabilisch     gegerbtes    Leder in       gelbstichigeren    Tönen an als der nach dem       1lauptpatent    erhältliche.



  Process for the preparation of a leather dye. According to the process described in Swiss main patent no.1.89871, leather is obtained in real shades of coloring dye if 4'-nitro-4-aminodiphenylamine-2'-sulfonic acid is diazotized and the diazo compound is coupled with 1,2-dioxybenzene,

   that 4-nitro-1-aminobenzene is furthermore diazotized and the diazo compound is coupled further with the previously obtained monoazo dye.



  As has now been found, the dye obtained in this way can be transformed into a somewhat more yellowish tinge by treating it with a mild oxidizing agent, preferably air.



  <I> Example: </I> A stream of air is passed through an aqueous solution of the dye obtained according to the main patent no. 189871 while heating for several hours. Like the deposited dye, chrome leather and vegetable-tanned leather stains in more yellowish tones than the one available under the main patent.

Claims (1)

PATEIVTTANSPRUCH Verfahren zur Herstellung eines Leder farbstoffes, dadurch gekennzeichnet, dass man die wässerige Lösung des nach dem Ver fahren gemäss Patentanspruch des schweize rischen Hauptpatentes Nr. 189871 erhält lichen Farbstoffes mit schwach wirkenden Oxydationsmitteln behandelt. PATENT CLAIM Process for the production of a leather dye, characterized in that the aqueous solution of the dye obtainable according to the method according to the patent claim of Swiss main patent no. 189871 is treated with weakly acting oxidizing agents. Der so erhal tene Farbstoff färbt Leder in etwas gelb- stiohigeren Tönen als der Ausgangsfarbstoff. UNTERANSPRUCH: Verfahren gemäss Patentanspruch, da durch gekennzeichnet, dass man als Oxy- dationsmittel Luft benutzt. The dye obtained in this way dyes leather in slightly more yellowish tones than the starting dye. SUBClaim: Method according to claim, characterized in that air is used as the oxidizing agent.
CH193082D 1934-12-21 1935-09-12 Process for the preparation of a leather dye. CH193082A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE193082X 1934-12-21
DE160235X 1935-02-16
DE200735X 1935-07-20

Publications (1)

Publication Number Publication Date
CH193082A true CH193082A (en) 1937-09-30

Family

ID=27180876

Family Applications (1)

Application Number Title Priority Date Filing Date
CH193082D CH193082A (en) 1934-12-21 1935-09-12 Process for the preparation of a leather dye.

Country Status (1)

Country Link
CH (1) CH193082A (en)

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