CH194661A - Process for the preparation of a leather dye. - Google Patents

Process for the preparation of a leather dye.

Info

Publication number
CH194661A
CH194661A CH194661DA CH194661A CH 194661 A CH194661 A CH 194661A CH 194661D A CH194661D A CH 194661DA CH 194661 A CH194661 A CH 194661A
Authority
CH
Switzerland
Prior art keywords
dye
leather
sulfonic acid
preparation
nitro
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 CH194661A publication Critical patent/CH194661A/en

Links

Description

  

  Verfahren zur Herstellung eines     Lederfarbstoffes.       Nach dem im Hauptpatent beschriebenen  Verfahren erhält man einen Leder in echten  Tönen anfärbenden Farbstoff, wenn man     1.2-          Dioxybenzol    mit einem     Mol    dianotierter     4'-          Nitro-4-aminodiphenylamin-2'-sulfosäure    und  einem     Mol    dianotiertem     4-Nitro-l-aminoben-          zol    kuppelt.  



  Wie nun weiter gefunden wurde, erhält  man einen     Farbstoff    von ähnlichen Eigen  schaften, wenn man     4'-Nitro-4-aminodiphe-          nylamin-2'-sulfosäure    dianotiert, die     Diazo-          verbindung    mit     1.2-Dioxybenzol    kuppelt,  den erhaltenen Farbstoff mit einem schwach  wirkenden Oxydationsmittel behandelt und  ihn dann mit dianotierter     1-Amino-4-nitro-          benzol-2-sulfosäure        weiterkuppelt.     



       Beispiel:     30,9 Teile     4'-Nitro-4-aminodiphenylamin-          2'-sulfosäure    werden in bekannter Weise  dianotiert und in Gegenwart von überschüs  sigem Alkali in der Kälte mit 11 Teilen       1.2-Dioxybenzol    gekuppelt. Durch die er  haltene Lösung des Farbstoffes bläst man  unter Erwärmen mehrere     Stunden    lang Luft    und gibt dann die aus 21,8 Teilen     1-Amino-          4-nitrobenzol-2-sulfosäure    erhaltene     Diazo-          verbindung    in Gegenwart von Alkali in der  Kälte zu.

   Nach beendeter Kupplung wird  wie üblich     ausgesalzen.    Der erhaltene Farb  stoff färbt Chromleder und vegetabilisch ge  gerbtes Leder in schönen Havannatönen von  guter Echtheit.



  Process for the preparation of a leather dye. According to the process described in the main patent, a dye that dyes leather in real shades is obtained if 1.2-dioxybenzene is mixed with one mole of dianotated 4'-nitro-4-aminodiphenylamine-2'-sulfonic acid and one mole of dianotized 4-nitro-l-aminoben zol couples.



  As has now been found further, a dye with similar properties is obtained if 4'-nitro-4-aminodiphenylamine-2'-sulfonic acid is dianotated, the diazo compound is coupled with 1,2-dioxybenzene, and the dye obtained is weakly treated oxidizing agent and then coupled with dianotated 1-amino-4-nitro-benzene-2-sulfonic acid.



       Example: 30.9 parts of 4'-nitro-4-aminodiphenylamine-2'-sulfonic acid are dianotized in a known manner and coupled with 11 parts of 1,2-dioxybenzene in the presence of excess alkali in the cold. Air is blown through the dyestuff solution obtained for several hours while warming, and the diazo compound obtained from 21.8 parts of 1-amino-4-nitrobenzene-2-sulfonic acid is then added in the presence of alkali in the cold.

   After the coupling is complete, salting out is carried out as usual. The dye obtained dyes chrome leather and vegetable-tanned leather in beautiful Havana tones with good fastness.

Claims (1)

PATENTANSPRUCH: Verfahren zur Herstellung eines Leder farbstoffes, dadurch gekennzeichnet, dass man 4'-Nitro-4-aminodiphenylamin-2'-sulfosäure dianotiert und mit 1.2-Dioxybenzol kuppelt, den erhaltenen Monoazofarbstoff mit einem schwach wirkenden Oxydationsmittel behan delt und schliesslich mit dianotierter 1-Amino- 4-nitrobeiizol-2-sulfosäure weiterkuppelt. Der Farbstoff färbt Chromleder und vegetabilisch gegerbtes Leder in schönen havannabraunen Tönen von guter Echtheit. PATENT CLAIM: A process for the production of a leather dye, characterized in that 4'-nitro-4-aminodiphenylamine-2'-sulfonic acid is dianotized and coupled with 1,2-dioxybenzene, the monoazo dye obtained is treated with a weakly acting oxidizing agent and finally with dianotated 1 -Amino-4-nitrobeiizole-2-sulfonic acid coupled further. The dye dyes chrome leather and vegetable-tanned leather in beautiful havana brown tones with good fastness.
CH194661D 1935-07-20 1935-09-12 Process for the preparation of a leather dye. CH194661A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE194661X 1935-07-20
CH189871T 1935-09-12

Publications (1)

Publication Number Publication Date
CH194661A true CH194661A (en) 1937-12-15

Family

ID=25721892

Family Applications (1)

Application Number Title Priority Date Filing Date
CH194661D CH194661A (en) 1935-07-20 1935-09-12 Process for the preparation of a leather dye.

Country Status (1)

Country Link
CH (1) CH194661A (en)

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