CH169692A - Process for the preparation of an acid dye. - Google Patents

Process for the preparation of an acid dye.

Info

Publication number
CH169692A
CH169692A CH169692DA CH169692A CH 169692 A CH169692 A CH 169692A CH 169692D A CH169692D A CH 169692DA CH 169692 A CH169692 A CH 169692A
Authority
CH
Switzerland
Prior art keywords
dye
preparation
amino
acid dye
acid
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 CH169692A publication Critical patent/CH169692A/en

Links

Description

  

      verfahre.    zur Herstellung eines     Säurefarbstoffes.       <B>Es</B> wurde gefunden, dass man neue, wert  volle Farbstoffe vom Charakter der Säure  farbstoffe erhält, indem man     Azofarbstoffe,     die durch alkalisches Kuppeln von     3-Amino-          1-oxybenzolen,    deren     4-Stellung    zur     Hydro-          xylgruppe    unbesetzt ist;

   mit wenigstens eine       löslichmachende        Sulfon-    oder     Carbonsäure-          gruppe    enthaltenden     Diazoverbindungen    erhal  ten werden     undkeinezurMetallkomplexbildung     befähigte Gruppe enthalten, in alkalischer  Lesung mit Oxydationsmitteln, vorzugsweise  Kupferverbindungen, behandelt. Hierdurch er  fahren     dicAzofarbstoffeeineÄnderungin    ihrem  Ton und eine Verbesserung der Lichtecht  heit der mit ihnen erzielten Färbungen.  



  Gegenstand der vorliegenden Erfindung  ist ein Verfahren zur Herstellung eines solchen       Säurefarbstoffes,    welches dadurch gekenn  zeichnet ist, dass man den aus dianotierter  4 -     Nitro    -     4'-        amino-diphenylamirr2-sulfosäure     und     3-Amino-l-oxybenzol    in     sodaalkaliseher     Lösung erhaltenen Farbstoff in alkalischer    Lösung mit einem Oxydationsmittel behan  delt.  



       Beispiel,     30,9 Teile     4-Nitro-4'-amino-diphenylamin-          2-sulfosäure    werden dianotiert und in     soda-          alkalischer    Lösung mit 10,9 Teilen     3-Amino-          1-oxybenzol    vereinigt. Nach beendigter Kupp  lung werden noch 25 Teile     Natriumcarbonat     und eine Lösung von 50 Teilen kristallisier  tem Kupfersulfat hinzugefügt und etwa eine  Stunde unter     Rückfluss    gekocht oder längere  Zeit, beispielsweise 2-3 Stunden, auf eine  Temperatur von 70-80   erhitzt. Nach Fil  tration wird der     Farbstoff    durch Zugabe von  Chlornatrium abgeschieden.

   Er färbt Chrom  leder, sowie vegetabilisch gegerbtes Leder       havannabraun.  



      proceed. for the production of an acid dye. It has been found that new, valuable dyes with the character of acid dyes are obtained by adding azo dyes, which are formed by alkaline coupling of 3-amino-1-oxybenzenes, their 4-position to the hydroxyl group is unoccupied;

   are obtained with at least one solubilizing sulfonic or carboxylic acid group containing diazo compounds and do not contain a group capable of metal complex formation, treated in alkaline reading with oxidizing agents, preferably copper compounds. As a result, the azote taffies experience a change in their tone and an improvement in the lightfastness of the colorations achieved with them.



  The present invention relates to a process for the production of such an acid dye, which is characterized in that the dye obtained from dianotated 4-nitro-4'-amino-diphenylamir2-sulfonic acid and 3-amino-1-oxybenzene in a soda-alkali solution is in alkaline solution treated with an oxidizing agent.



       Example, 30.9 parts of 4-nitro-4'-aminodiphenylamine-2-sulfonic acid are dianotized and combined with 10.9 parts of 3-amino-1-oxybenzene in a soda-alkaline solution. After coupling is complete, 25 parts of sodium carbonate and a solution of 50 parts of crystallized copper sulfate are added and refluxed for about an hour or heated to a temperature of 70-80 for a longer period, for example 2-3 hours. After Fil tration, the dye is deposited by adding sodium chloride.

   He dyes chrome leather and vegetable tanned leather havana brown.

Claims (1)

PATENTANSPRUCH: Verfahren zur Herstellung eines Säure farbstoffes, dadurch gekennzeichnet, dass man den aus dianotierter 4-Nitro-4'-amino-diphe- nylamin-2-sulfosäure und 3-Amino-l-oxybenzol in sofiaalkalischer Lösung erhaltenen. Farb stoff in alkalischer Lösung mit Oxydations mitteln behandelt. Der erhaltene Farbstoff färbt Chromleder, sowie vegetabilisch gegerbtes Leder havanna braun. UNTERANSPRÜCH: Verfahren nach Patentanspruch, dadurch gekennzeichnet, dass man als Oxydations mittel eine Kupferoxydverbindung wählt. Claim: A process for the preparation of an acid dye, characterized in that the obtained from dianotated 4-nitro-4'-amino-diphenylamine-2-sulfonic acid and 3-amino-1-oxybenzene in sofia-alkaline solution. Dye treated in an alkaline solution with oxidizing agents. The dye obtained dyes chrome leather and vegetable-tanned leather havanna brown. SUBSTANTIAL CLAIM: Process according to claim, characterized in that a copper oxide compound is selected as the oxidizing agent.
CH169692D 1932-06-24 1933-03-17 Process for the preparation of an acid dye. CH169692A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE169692X 1932-06-24
CH169692T 1933-03-17

Publications (1)

Publication Number Publication Date
CH169692A true CH169692A (en) 1934-06-15

Family

ID=25718753

Family Applications (1)

Application Number Title Priority Date Filing Date
CH169692D CH169692A (en) 1932-06-24 1933-03-17 Process for the preparation of an acid dye.

Country Status (1)

Country Link
CH (1) CH169692A (en)

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