CH226841A - Process for the preparation of an acidic disazo dye. - Google Patents

Process for the preparation of an acidic disazo dye.

Info

Publication number
CH226841A
CH226841A CH226841DA CH226841A CH 226841 A CH226841 A CH 226841A CH 226841D A CH226841D A CH 226841DA CH 226841 A CH226841 A CH 226841A
Authority
CH
Switzerland
Prior art keywords
acidic
preparation
disazo dye
red
dye
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 CH226841A publication Critical patent/CH226841A/en

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
    • C09B35/00—Disazo and polyazo dyes of the type A<-D->B prepared by diazotising and coupling
    • C09B35/02—Disazo dyes
    • C09B35/039—Disazo dyes characterised by the tetrazo component
    • C09B35/28—Disazo dyes characterised by the tetrazo component the tetrazo component containing two aryl nuclei linked by at least one of the groups —CON<, —SO2N<, —SO2—, or —SO2—O—

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Coloring (AREA)

Description

  

  <B>Zusatzpatent</B> zum Hauptpatent Nr. 223541.         Verfahren    zur Darstellung eines sauren     Disazofarbstofes.       Gegenstand des vorliegenden Zusatz  patentes ist ein Verfahren zur Darstellung  eines sauren     Disazofarbstoffes,    dadurch ge  kennzeichnet, dass man     4,4'-Dimethogy-3,3'-          diaminodiphenylsulfon        tetrazotiert    und die       Tetrazoverbindung    mit 2     Mol        2-Amino-8-          ogy        naphthalin-6-sulfonsäure    in saurer Lö  sung kuppelt.  



  <I>Beispiel:</I>  30,8 Teile     4,4'-Dimethogy-3,3'-diamino-          diphenylsulfon    werden in üblicher Weise       tetrazotiert.    Die     Tetrazoniumlösung    kuppelt  man mit 47,8 Teilen     2-Amino-8-ogynaphtha-          lin-6-sulfonsäure,    die man in 200 Teilen  Wasser mit der nötigen     Sodamenge    neutral  gelöst und wieder mit Salzsäure durch An  säuern bis zu kongosaurer     Reaktion    ausgefällt  hat. Die Kupplung erfolgt langsam, durch  Erwärmen und Zusatz von     Natriumacetat     kann sie jedoch beschleunigt werden.

   Nach    Beendigung der     Farbstoffbildung    stellt man  mit     Sodalösung    kongoneutral, filtriert und  trocknet. Der Farbstoff, ein dunkelrotes Pul  ver, löst sich in Wasser rot, in konzentrierter  Schwefelsäure violett und färbt Wolle aus  saurem Bade in blauroten, lichtechten Tönen.



  <B> Additional patent </B> to the main patent No. 223541. Process for the preparation of an acidic disazo dye. The subject of the present additional patent is a process for the preparation of an acidic disazo dye, characterized in that 4,4'-dimethogy-3,3'-diaminodiphenyl sulfone is tetrazotized and the tetrazo compound with 2 moles of 2-amino-8-ogy naphthalene-6 -sulfonic acid in acidic solution couples.



  <I> Example: </I> 30.8 parts of 4,4'-dimethogy-3,3'-diamino-diphenylsulfone are tetrazotized in the usual way. The tetrazonium solution is coupled with 47.8 parts of 2-amino-8-ogynaphthalin-6-sulfonic acid, which has been dissolved neutrally in 200 parts of water with the necessary amount of soda and precipitated again with hydrochloric acid by acidifying to a Congo-acidic reaction. The coupling is slow, but it can be accelerated by heating and adding sodium acetate.

   After the dye formation has ended, it is made Congo-neutral with soda solution, filtered and dried. The dye, a dark red powder, dissolves red in water, violet in concentrated sulfuric acid and dyes wool from acid baths in blue-red, lightfast shades.

Claims (1)

PATENTANSPRUCH: Verfahren zur Darstellung eines sauren Disazofarbstoffes, dadurch gekennzeichnet, dass man 4,4'-Dimethogy-3,3'-diaminodiphe- nyIsulfon tetrazotiert und die Tetrazoverbin- dung mit 2 Mol 2-Amino-8-ogynaphthalin-6- sulfonsäure in saurer Lösung kuppelt. Der neue Farbstoff stellt nach dem Trock nen ein dunkelrotes Pulver dar, das sich in Wasser mit roter, in konzentrierter Schwefel säure mit violetter Farbe löst und Wolle aus saurem Bade in blauroten, lichtechten Tönen färbt. PATENT CLAIM: A process for the preparation of an acidic disazo dye, characterized in that 4,4'-dimethogy-3,3'-diaminodiphe- nyIsulfon is tetrazotized and the tetrazotization with 2 moles of 2-amino-8-ogynaphthalene-6-sulfonic acid in acidic solution couples. After drying, the new dye is a dark red powder that dissolves in water with red, in concentrated sulfuric acid with a violet color and dyes wool from an acid bath in blue-red, lightfast shades.
CH226841D 1941-07-29 1941-07-29 Process for the preparation of an acidic disazo dye. CH226841A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH226841T 1941-07-29
CH223541T 1941-07-29

Publications (1)

Publication Number Publication Date
CH226841A true CH226841A (en) 1943-04-30

Family

ID=25726717

Family Applications (1)

Application Number Title Priority Date Filing Date
CH226841D CH226841A (en) 1941-07-29 1941-07-29 Process for the preparation of an acidic disazo dye.

Country Status (1)

Country Link
CH (1) CH226841A (en)

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