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CH182400A - Process for the preparation of an azo dye. - Google Patents

Process for the preparation of an azo dye.

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Publication number
CH182400A
CH182400A CH182400DA CH182400A CH 182400 A CH182400 A CH 182400A CH 182400D A CH182400D A CH 182400DA CH 182400 A CH182400 A CH 182400A
Authority
CH
Switzerland
Prior art keywords
preparation
azo dye
dye
violet
diogypropyl
Prior art date
Application number
Other languages
German (de)
Inventor
A-G J R Geigy
Original Assignee
Geigy Ag J R
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 Geigy Ag J R filed Critical Geigy Ag J R
Publication of CH182400A publication Critical patent/CH182400A/en

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Description

  

  Verfahren zur Darstellung eines     Azofarbstofes.       Es wurde gefunden, dass man durch Diano  tierung und Kupplung von     5-Chlor-2,4-di-          nitranilin    mit     Äthyl-,Q,r-diogypropyl-m-tolui-          din    einen     schwerlöslichen        Azofarbstoff    erhält,  der sehr wertvolle Eigenschaften besitzt.

   Er  färbt Lacke und     Acetatseide    lichtecht violett;  die gefärbte Faser besitzt sehr gute Echt  heitseigenschaften und ist rein weiss     ätzbar.     <I>Beispiel:</I>  217,5 Teile     5-Chlor-2,4-dinitranilin    werden  mit der berechneten Menge     Nitrosylschwefel-          säure    in konzentriert schwefelsaurer Lösung  dianotiert, auf Eis gegossen und die verdünnte       Diazoniumlösung    mineralsauer mit 209 Teilen       Äthyl-ss,r-diogypropyl-m-toluidin    gekuppelt.

    Nach kurzer Zeit ist die     Farbstoffbildung     beendet; das     Kupplungsprodukt    wird in  üblicher Weise isoliert, neutral gewaschen,  vergastet oder, nach dem Trocknen bei    mässiger Temperatur, zu einem Färbepräparat  umgearbeitet. Der Farbstoff, ein in Wasser  unlösliches, dunkles Pulver, löst sich in  Alkohol oder ähnlichen, organischen Lösungs  mitteln mit violetter, in konzentrierter     Schw        e-          felsäure    mit roter Farbe.



  Process for the preparation of an azo dye. It has been found that by dialing and coupling 5-chloro-2,4-di-nitroaniline with ethyl-, Q, r-diogypropyl-m-toluidine, a sparingly soluble azo dye is obtained which has very valuable properties.

   It dyes lacquers and acetate silk lightfast violet; the dyed fiber has very good fastness properties and can be etched in pure white. <I> Example: </I> 217.5 parts of 5-chloro-2,4-dinitraniline are dianotized with the calculated amount of nitrosylsulfuric acid in concentrated sulfuric acid solution, poured onto ice and the diluted diazonium solution is minerally acidic with 209 parts of ethyl ss , r-diogypropyl-m-toluidine coupled.

    After a short time, the dye formation is complete; the coupling product is isolated in the usual way, washed neutral, gasified or, after drying at a moderate temperature, worked into a dye preparation. The dye, a dark powder that is insoluble in water, dissolves in alcohol or similar organic solvents with a purple color, in concentrated sulfuric acid with a red color.

Claims (1)

PATENTANSPRUCH: Verfahren zur Darstellung eines Azofarb- stoffes, dadurch gekennzeichnet, dass man 5-Chlor-2,4-dinitranilin dianotiert und mit Äthyl-R,r-diogypropyl-m-toluidin kuppelt. Der Farbstoff, ein in Wasser unlösliches, dunkles Pulver, löst sich in Alkohol oder ähnlichen Lösungsmitteln mit violetter, in konzentrierter Schwefelsäure mit roter Farbe. Er färbt Lacke und Acetatseide lichtecht violett; die gefärbte Faser besitzt sehr gute Echtheitseigenschaften und ist rein weiss ätzbar. PATENT CLAIM: Process for the preparation of an azo dye, characterized in that 5-chloro-2,4-dinitraniline is dianotized and coupled with ethyl-R, r-diogypropyl-m-toluidine. The dye, a dark powder that is insoluble in water, dissolves in alcohol or similar solvents with a violet color, in concentrated sulfuric acid with a red color. It dyes lacquers and acetate silk lightfast violet; the dyed fiber has very good fastness properties and can be etched in pure white.
CH182400D 1934-04-09 1935-04-01 Process for the preparation of an azo dye. CH182400A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE182400X 1934-04-09

Publications (1)

Publication Number Publication Date
CH182400A true CH182400A (en) 1936-02-15

Family

ID=5718091

Family Applications (1)

Application Number Title Priority Date Filing Date
CH182400D CH182400A (en) 1934-04-09 1935-04-01 Process for the preparation of an azo dye.

Country Status (1)

Country Link
CH (1) CH182400A (en)

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