CH107620A - Process for the preparation of an azo dye. - Google Patents

Process for the preparation of an azo dye.

Info

Publication number
CH107620A
CH107620A CH107620DA CH107620A CH 107620 A CH107620 A CH 107620A CH 107620D A CH107620D A CH 107620DA CH 107620 A CH107620 A CH 107620A
Authority
CH
Switzerland
Prior art keywords
preparation
azo dye
dye
acid
toluidide
Prior art date
Application number
Other languages
German (de)
Inventor
Farbwerke Vorm Meiste Bruening
Original Assignee
Hoechst 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 Hoechst Ag filed Critical Hoechst Ag
Publication of CH107620A publication Critical patent/CH107620A/en

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

Description

  

  Verfahren zur Darstellung eines     Azofarbstoffes.       Es wurde gefunden. dass man zu einem  Farbstoff, welcher Färbungen von ausge  zeichneten     Echtheitseigenschaften,    gibt, ge  langt, wenn man die     Diazoverbindung    von       m-Ami,do-p-methoxybenzoesäure-anilid    mit  2 - 3 -     oxy        naphtoesäure    - 5 - chlor - 2 -     toluidid          (CH:,    :     NI-I2    : Cl = 1 : 2 : 5)     kuppelt.    Man  erhält: hierbei einen Farbstoff von ausge  zeichnet klarer,     blaustichig    roter Nuance.

    der die wichtige Eigenschaft besitzt,     dass    er  zur Erzeugung von echten     alizarinrosa    Tönen  dienen kann.  



       Beispiel:     Die aus<U>94,2-</U> kg     Metaamidopara.methoxy-          benzoesäureanilid    in üblicher Weise darge  stellte     Diazoverbindung    lässt man unter  Rühren in eine     wiisserige        Suspension    von .  31 kg 2 -     3-oxynaphtoesäure-5-chlor-2-toluidid          (CHF    :     NH,    : Cl === 1 : 2 : 5), bereitet durch    Auflösen desselben in     Natronlauge    und     'Wie-          clerausfällen    mit verdünnter Essigsäure, ein  laufen.

   Der Farbstoff     scheidet    sich als roter  Niederschlag aus. Darauf wird filtriert; ge  waschen und getrocknet.



  Process for the preparation of an azo dye. It was found. that one arrives at a dye which gives dyeings with excellent fastness properties if one uses the diazo compound of m-ami, do-p-methoxybenzoic acid anilide with 2 - 3 - oxy naphthoic acid - 5 - chloro - 2 - toluidide ( CH :,: NI-I2: Cl = 1: 2: 5) couples. The following is obtained: a dye with an excellent clear, bluish red shade.

    which has the important property that it can be used to create real alizarin pink tones.



       Example: The diazo compound prepared in the usual way from <U> 94.2 </U> kg of metaamidopara.methoxybenzoic acid anilide is allowed to stir into an aqueous suspension of. 31 kg of 2- 3-oxynaphthoic acid-5-chloro-2-toluidide (CHF: NH,: Cl === 1: 2: 5), prepared by dissolving it in sodium hydroxide solution and precipitating it again with dilute acetic acid.

   The dye separates out as a red precipitate. It is then filtered; ge wash and dry.

Claims (1)

PATENTANSPRUCH: Verfahren zur Darstellung eines Azo- farbstoffes, dadurch gekennzeichnet, dass man die Diazoverbindung von m-Amiclopara- methoxybenzoesäureanilid mit<B>2-3</B> - oxy- naphtoesäure-5-chlor-2-toluidid (CH, :NE.' Cl = 1<B>:29 :5)</B> kuppelt. Der Farbstoff stellt ein rotes Pulver dar und eignet sich besonders gut zur Erzeugung von alizarinrosa Tönen. PATENT CLAIM: Process for the preparation of an azo dye, characterized in that the diazo compound of m-amicloparamethoxybenzoic acid anilide with <B> 2-3 </B> - oxynaphthoic acid-5-chloro-2-toluidide (CH,: NE. 'Cl = 1 <B>: 29: 5) </B> couples. The dye is a red powder and is particularly suitable for creating alizarin pink tones.
CH107620D 1923-01-18 1924-01-15 Process for the preparation of an azo dye. CH107620A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE107620X 1923-01-18

Publications (1)

Publication Number Publication Date
CH107620A true CH107620A (en) 1924-11-01

Family

ID=5651064

Family Applications (1)

Application Number Title Priority Date Filing Date
CH107620D CH107620A (en) 1923-01-18 1924-01-15 Process for the preparation of an azo dye.

Country Status (1)

Country Link
CH (1) CH107620A (en)

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