CH99676A - Process for the preparation of an azo dye. - Google Patents

Process for the preparation of an azo dye.

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Publication number
CH99676A
CH99676A CH99676DA CH99676A CH 99676 A CH99676 A CH 99676A CH 99676D A CH99676D A CH 99676DA CH 99676 A CH99676 A CH 99676A
Authority
CH
Switzerland
Prior art keywords
azo dye
preparation
chloro
dye
dyes
Prior art date
Application number
Other languages
German (de)
Inventor
Griesheim-Elektron Chem Fabrik
Original Assignee
Griesheim Elektron Chem Fab
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 Griesheim Elektron Chem Fab filed Critical Griesheim Elektron Chem Fab
Publication of CH99676A publication Critical patent/CH99676A/en

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  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Description

  

  Verfahren zur Herstellung eines     Azofarbstoffes.       Es wurde gefunden, dass man zu sehr       bäuchechten    Farbstoffen von     Alizarinnuan-          cen    gelangt, wenn man die     Diazoverbindung     von     4-Chlor-3-toluidin    mit dem     4-Chlor-3-to-          luidid    der 27.     3-Oxynaphtoesäure    kuppelt. Der  Farbstoff kann für sich allein zwecks Ver  wendung als roter Pigmentfarbstoff herge  stellt werden, er kann aber auch auf der  vegetabilischen Faser erzeugt werden.

   Die       Bäuchechtheit    dieses Farbstoffes ist im  Gegensatz zu derjenigen ähnlich     zusammen-          geset.zter    Farbstoffe ganz überraschend.  



  <I>Beispiel:</I>  Die aus 14,1     gr        4-Chlor-3-i;oluidin    in üb  licher Weise dargestellte     Diazoverbindung     lässt man unter Rühren in eine wässerige  Suspension von 33     gr    2 .     3-Oxynaphtoesäure-          4-Chlor-3-toluidid    einfliessen, bereitet durch  Auflösen in Natronlauge und Wiederaus-    fällen mit verdünnter Essigsäure. Der Farb  stoff scheidet sich in roten Flocken aus;  darauf wird filtriert, gewaschen und ge  trocknet.



  Process for the preparation of an azo dye. It has been found that alizarinnuancene dyes that are very stable in the stomach are obtained if the diazo compound of 4-chloro-3-toluidine is coupled with the 4-chloro-3-toluidide of 27.3-oxynaphthoic acid. The dye can be used on its own as a red pigment, but it can also be produced on the vegetable fiber.

   The fastness to the stomach of this dye, in contrast to that of similarly composed dyes, is quite surprising.



  <I> Example: </I> The diazo compound, prepared from 14.1 g 4-chloro-3-i; oluidine in the usual way, is left with stirring in an aqueous suspension of 33 g 2. Pour in 3-oxynaphthoic acid-4-chloro-3-toluidide, prepared by dissolving it in sodium hydroxide solution and reprecipitating it with dilute acetic acid. The dye separates out in red flakes; it is then filtered, washed and dried.

Claims (1)

PATENTANSPRUCH: Verfahren zur- Herstellung eines Azo- farbstoffes, dadurch gekennzeichnet, dass man die Diazoverbindung des 4-Chlor-3-to- luidins mit dem 4-Chlor-3-toluidid der 2.3- Oxynaphtoesäure kombiniert. Der neue Farb stoff hat Alizarinnuance und die mit ihm auf der Faser erzeugten Färbungen sind gegenüber den mit bekannten ähnlich zu sammengesetzten Farbstoffen hergestellten vollkommen bäuchecht. PATENT CLAIM: Process for the production of an azo dye, characterized in that the diazo compound of 4-chloro-3-toluidine is combined with the 4-chloro-3-toluidide of 2,3-oxynaphtoic acid. The new dye has an alizarin nuance and the dyes produced on the fiber with it are completely stomach-resistant compared to those produced with known similar dyes.
CH99676D 1921-08-03 1922-06-20 Process for the preparation of an azo dye. CH99676A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE99676X 1921-08-03
CH99284T 1922-06-20

Publications (1)

Publication Number Publication Date
CH99676A true CH99676A (en) 1923-06-16

Family

ID=25705530

Family Applications (1)

Application Number Title Priority Date Filing Date
CH99676D CH99676A (en) 1921-08-03 1922-06-20 Process for the preparation of an azo dye.

Country Status (1)

Country Link
CH (1) CH99676A (en)

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