CH226845A - Process for the preparation of an acidic disazo dye. - Google Patents

Process for the preparation of an acidic disazo dye.

Info

Publication number
CH226845A
CH226845A CH226845DA CH226845A CH 226845 A CH226845 A CH 226845A CH 226845D A CH226845D A CH 226845DA CH 226845 A CH226845 A CH 226845A
Authority
CH
Switzerland
Prior art keywords
acidic
preparation
dye
disazo dye
red
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 CH226845A publication Critical patent/CH226845A/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     Bisazofarbstoffes.       Gegenstand des vorliegenden Zusatz  patentes ist ein Verfahren zur Darstellung  eines sauren     Disazofarbstoffes,    dadurch ge  kennzeichnet, dass man     2,4'-Dimethyl-3,3'-          diaminodiphenylsulfon        tetrazotiert    und die       Tetrazoverbindung    mit 2     Mol        2-Amino-8-          ogynaphthalin-6-sulfonsäure    in saurer Lö  sung kuppelt.  



  <I>Beispiel:</I>  27,6 Teile     2,4'-Dimethyl-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 aus  gefällt hat. Die Kupplung erfolgt langsam,  durch     Erwärmen    und Zusatz von Natrium  acetat kann sie jedoch beschleunigt werden.

    Nach     Beendigung    der     Farbstoffbildung    .stellt    man     w#1)        Sodalösung    kongoneutral, filtriert  und trocknet. Der Farbstoff, ein dunkelrotes  Pulver, löst sich in Wasser rot, in konzen  trierter Schwefelsäure violett und färbt  Wolle 'aus saurem Bade in blaustichig roten,       lichtechten    Tönen.



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



  <I> Example: </I> 27.6 parts of 2,4'-dimethyl-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 acid reaction. The coupling takes place slowly, but it can be accelerated by heating and adding sodium acetate.

    After the formation of the dye has ended, make w # 1) soda solution congoneutral, filter and dry. The dye, a dark red powder, dissolves red in water, violet in concentrated sulfuric acid and dyes wool from acid baths in bluish red, lightfast shades.

Claims (1)

PATENTANSPRUCH: Verfahren zur Darstellung eines sauren Disazofarbstoffes, dadurch gekennzeichnet, dass man 2,4'-Dimethyl-3,3'-diaminodiphenyl- sulfon tetrazotiert und die Tetrazoverbin- dung mit 2 Mol 2-Amino-8-ogynaphthalin-6- sulfonsäure in saurer Lösung kuppelt. PATENT CLAIM: Process for the preparation of an acidic disazo dye, characterized in that 2,4'-dimethyl-3,3'-diaminodiphenylsulfone is tetrazotized and the tetrazo compound with 2 moles of 2-amino-8-ogynaphthalene-6-sulfonic acid in acidic solution couples. Der neue Farbstoff stellt nach dem Trock nenein dunkelrotes Pulver dar, das, sich in Wasser mit roter, in konzentrierter Schwefel säure mit violetter Farbe löst und Wolle aus saurem Bade in blaustichig roten, lichtechten Tönen färbt. After drying, the new dye is a dark red powder that dissolves in water with red, in concentrated sulfuric acid with violet color and dyes wool from acid bath in bluish red, lightfast shades.
CH226845D 1941-07-29 1941-07-29 Process for the preparation of an acidic disazo dye. CH226845A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH226845T 1941-07-29
CH223541T 1941-07-29

Publications (1)

Publication Number Publication Date
CH226845A true CH226845A (en) 1943-04-30

Family

ID=25726721

Family Applications (1)

Application Number Title Priority Date Filing Date
CH226845D CH226845A (en) 1941-07-29 1941-07-29 Process for the preparation of an acidic disazo dye.

Country Status (1)

Country Link
CH (1) CH226845A (en)

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