CH167387A - Process for the preparation of an o-oxyazo dye. - Google Patents

Process for the preparation of an o-oxyazo dye.

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Publication number
CH167387A
CH167387A CH167387DA CH167387A CH 167387 A CH167387 A CH 167387A CH 167387D A CH167387D A CH 167387DA CH 167387 A CH167387 A CH 167387A
Authority
CH
Switzerland
Prior art keywords
dye
oxyazo
preparation
copper
constitution
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 CH167387A publication Critical patent/CH167387A/en

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Description

  

  Verfahren zur Herstellung     eines        o-Oxyazofarbstoffes.       Es wurde gefunden, dass man den     o-Oxyazofarbstoff    der     Formel:     
EMI0001.0005     
    dadurch erhalten kann, dass man den     Disazofarbstoff    der     Konstitution     
EMI0001.0008     
    mit einem Schwefelalkali behandelt.

        20     gr    der Kupferverbindung des     Disazofarbstoffes    der- folgenden Konstitution:  
EMI0002.0003     
    erhältlich durch Kuppeln von 1     Mol        tetrazo-          tiertem        4.4'-Diamino-3.3'-dimethoxydiphenyl-          harnstoff    mit 2     Mol        2-Oxynaphthalin-6-sulfo-          säure    und Kupfern unter Aufspaltung der       Methoxygruppen,    werden mit einer Schwefel  natrium enthaltenden Flüssigkeit erwärmt,  bis das Kupfer sich aus dem Farbstoff ab-    geschieden hat.

   Dann filtriert man von dem  Schwefelkupfer ab und salzt den Farbstoff  nach dem Ansäuern aus. Der     Farbstoff    stellt  ein dunkles Pulver dar, das Baumwolle aus  alkalischem Bade violett anfärbt. Durch Nach  behandeln der Färbung mit Kupfersalzen er  hält man ein klares, lichtechtes Rotviolett.



  Process for the preparation of an o-oxyazo dye. It has been found that the o-oxyazo dye of the formula:
EMI0001.0005
    can be obtained by having the disazo dye of the constitution
EMI0001.0008
    treated with an alkali sulfur.

        20 grams of the copper compound of the disazo dye of the following constitution:
EMI0002.0003
    obtainable by coupling 1 mol of tetrazo- tated 4,4'-diamino-3,3'-dimethoxydiphenyl urea with 2 mol of 2-oxynaphthalene-6-sulfonic acid and copper with splitting of the methoxy groups, are heated with a liquid containing sodium sulfur until the Copper has separated from the dye.

   The copper sulphide is then filtered off and the dye is salted out after acidification. The dye is a dark powder that dyes cotton from an alkaline bath purple. After treating the dye with copper salts, you get a clear, lightfast red-violet.

Claims (1)

PATENTANSPRUCH: Verfahren zur Herstellung des o-0xyazofarbstoffes der Formel: EMI0002.0015 dadurch gekennzeichnet, dass man den Disazofarbstoff der Konstitution EMI0002.0017 mit einem Schwefelalkali behandelt. Der Farbstoff stellt ein dunkles Pulver dar, das Baumwolle aus alkalischem Bade violett anfärbt. Durch Nachbehandeln der Färbung mit Kupfersalzen erhält man ein klares, lichtechtes Rotviolett. PATENT CLAIM: Process for the preparation of the o-oxyazo dye of the formula: EMI0002.0015 characterized in that one has the disazo dye of the constitution EMI0002.0017 treated with an alkali sulfur. The dye is a dark powder that dyes cotton from an alkaline bath purple. After-treating the dye with copper salts, a clear, lightfast red-violet is obtained.
CH167387D 1931-11-13 1932-11-01 Process for the preparation of an o-oxyazo dye. CH167387A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE167387X 1931-11-13
CH163896T 1932-11-01

Publications (1)

Publication Number Publication Date
CH167387A true CH167387A (en) 1934-02-15

Family

ID=25717885

Family Applications (1)

Application Number Title Priority Date Filing Date
CH167387D CH167387A (en) 1931-11-13 1932-11-01 Process for the preparation of an o-oxyazo dye.

Country Status (1)

Country Link
CH (1) CH167387A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2736724A (en) * 1952-09-18 1956-02-28 Sandoz Ag Disazo dyestuffs

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2736724A (en) * 1952-09-18 1956-02-28 Sandoz Ag Disazo dyestuffs

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