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CH164547A - Process for the preparation of an azo dye. - Google Patents

Process for the preparation of an azo dye.

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Publication number
CH164547A
CH164547A CH164547DA CH164547A CH 164547 A CH164547 A CH 164547A CH 164547D A CH164547D A CH 164547DA CH 164547 A CH164547 A CH 164547A
Authority
CH
Switzerland
Prior art keywords
preparation
azo dye
sulfonic acid
leather
dye
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 CH164547A publication Critical patent/CH164547A/en

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Description

  

  Verfahren zur Darstellung eines     Azofarbstoffes.       Durch Kombination von     Amidoalphyloxy-          naphthyltriazolsulfosäuren    mit     Diazoverbin-          dungen    werden, wie bekannt,     Azofarbstoffe     erhalten, die besondere Affinität zur Baum  wollfaser haben und sich auf ihr     diazotieren     und entwickeln lassen.  



  Es wurde nun gefunden, dass man zu  wertvollen     Farbstoffen    gelangt, die im Ge  gensatz zu den erwähnten keine Affinität zur  Baumwollfaser besitzen, sondern den Cha  rakter vorn     Säurefarbstoffen    haben, die in  hervorragendem     blasse    befähigt sind, Leder  aus saurem Bade gleichmässig anzufärben,  wenn man eine     Aryloxynaphthyl-1.2-triazol-          sulfosKure,    die im     Arylkern    eine     Nitrogruppe     trägt, als     Azokomponente    wählt.  



       Beispiel:     27,7 Teile     4-Aminoazobenzol-4'-sulfosäure     werden in bekannter Weise dianotiert und  mit einer kalten     sodaalkalisch    gehaltenen  Lösung von 40,8 Teilen     4'-nitrophenyl-5-oxy-          rraphthyi-1.2-triazol-7-sulfosaurem    Natrium  der Formel  
EMI0001.0021     
    vereinigt.  Nach beendeter Kupplung wird mit Koch  salz abgeschieden und der     Farbstoff    in übli  cher Weise aufgearbeitet. Er färbt Chrom  leder und vegetabilisch gegerbtes Leder in  schönen rotbraunen Tönen von guter Licht  echtheit an.



  Process for the preparation of an azo dye. By combining amidoalphyloxynaphthyltriazole sulfonic acids with diazo compounds, as is known, azo dyes are obtained which have a particular affinity for cotton fibers and which can be diazotized and developed on it.



  It has now been found that valuable dyes are obtained which, in contrast to those mentioned, have no affinity for cotton fibers, but rather have the character of acid dyes, which are extremely pale capable of evenly staining leather from acidic baths if one Chooses aryloxynaphthyl-1,2-triazol-sulfosKure, which has a nitro group in the aryl nucleus, as the azo component.



       Example: 27.7 parts of 4-aminoazobenzene-4'-sulfonic acid are dianotized in a known manner and treated with a cold solution of 40.8 parts of 4'-nitrophenyl-5-oxyrraphthyi-1,2-triazole-7-sulfonic acid sodium the formula
EMI0001.0021
    united. When the coupling is complete, it is deposited with sodium chloride and the dye is worked up in a customary manner. It stains chrome leather and vegetable-tanned leather in beautiful red-brown tones with good lightfastness.

Claims (1)

PATENTANSPRUCH: Verfahren zur Darstellung eines Azofarb- stoffes, dadurch gekennzeichnet, dass man 4'-Nitrophenyl-5-oxynaphthyl-l. 2-triazol-7-sul- fosäure in alkalischem Bad mit dianotierter 4-Aminoazoberizol-4'-sulfosäure kuppelt. Der Farbstoff färbt Chromleder und vegetabilisch gegerbtes Leder in rotbraunen lichtechten Tönen an. PATENT CLAIM: Process for the preparation of an azo dye, characterized in that 4'-nitrophenyl-5-oxynaphthyl-l. Coupling 2-triazole-7-sulfonic acid in an alkaline bath with dianotized 4-aminoazoberizole-4'-sulfonic acid. The dye stains chrome leather and vegetable-tanned leather in red-brown, lightfast shades.
CH164547D 1932-02-15 1932-11-04 Process for the preparation of an azo dye. CH164547A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE164547X 1932-02-15

Publications (1)

Publication Number Publication Date
CH164547A true CH164547A (en) 1933-10-15

Family

ID=5684527

Family Applications (1)

Application Number Title Priority Date Filing Date
CH164547D CH164547A (en) 1932-02-15 1932-11-04 Process for the preparation of an azo dye.

Country Status (1)

Country Link
CH (1) CH164547A (en)

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