CH226844A - Process for the preparation of an acidic disazo dye. - Google Patents

Process for the preparation of an acidic disazo dye.

Info

Publication number
CH226844A
CH226844A CH226844DA CH226844A CH 226844 A CH226844 A CH 226844A CH 226844D A CH226844D A CH 226844DA CH 226844 A CH226844 A CH 226844A
Authority
CH
Switzerland
Prior art keywords
acidic
preparation
disazo dye
acid
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 CH226844A publication Critical patent/CH226844A/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—

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

Description

  

      Zusatzpatent    zum     Hauptpatent        Nr.223541.       Verfahren zur Darstellung eines sauren     Disazofarbstoifes.       Gegenstand des vorliegenden Zusatz  patentes ist ein Verfahren zur Darstellung  eines sauren     Disazofarbstoffes,    dadurch ge  kennzeichnet, dass man     3,3'-Diaminodiphenyl-          sulfon        tetrazotiert    und die     Tetrazoverbindung     mit 2     Mol        2-Amino-8-ogynaphthalin-6-sulfon-          säure    in saurer Lösung kuppelt.  



  <I>Beispiel:</I>  24,8 Teile     3,3'-Diaminodiphenylsulfon     werden in üblicher Weise     tetrazotiert.    Die       Tetrazoniumlösung    kuppelt man mit 47,8 Tei  len     2-Amino-8-oxynaphthalin-6-sulfonsäure,     die man in 200 Teilen Wasser mit der nötigen       Sodamenge    neutral gelöst und wieder mit  Salzsäure durch Ansäuern bis zu kongosaurer  Reaktion ausgefällt hat. Die Kupplung er  folgt langsam, durch     Erwärmen    und Zusatz  von     Natriumacetat    kann sie jedoch beschleu  nigt werden.

   Nach Beendigung der     Farb-          stoffbildung    Stellt man mit     Sodalösung       kongoneutral, filtriert und trocknet. Der  Farbstoff, ein dunkelrotes Pulver, löst sich  in Wasser     gelbstichig    rot, in konzentrierter  Schwefelsäure violett und färbt Wolle aus  saurem Bade in     gelbstichig    roten, lichtechten  Tönen.



      Additional patent to the main patent number 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 3,3'-diaminodiphenylsulfone is tetrazotized and the tetrazo compound with 2 moles of 2-amino-8-ogynaphthalene-6-sulfonic acid in acidic Solution couples.



  <I> Example: </I> 24.8 parts of 3,3'-diaminodiphenyl sulfone are tetrazotized in the usual way. The tetrazonium solution is coupled with 47.8 parts of 2-amino-8-oxynaphthalene-6-sulfonic acid, which has been dissolved in 200 parts of water with the necessary amount of soda and again precipitated with hydrochloric acid by acidification 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 color has ended, make Congo-neutral with soda solution, filter and dry. The dye, a dark red powder, dissolves in water to a yellowish red, in concentrated sulfuric acid violet and dyes wool from an acid bath in yellowish red, lightfast shades.

Claims (1)

PATENTANSPRUCH: Verfahren zur Darstellung eines sauren Disazofarbstoffes, dadurch gekennzeichnet, dass man 3,3'-Diaminodiphenylsulfon tetra- zotiert und die Tetrazoverbindung 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 3,3'-diaminodiphenylsulfone is tetrazotized and the tetrazo compound is coupled with 2 moles of 2-amino-8-ogynaphthalene-6-sulfonic acid in acidic solution. Der neue Farbstoff stellt nach dem Trock nen ein dunkelrotes Pulver dar, das sich in Wasser mit gelbstichig roter, in konzentrier ter Schwefelsäure mit violetter Farbe löst und Wolle aus saurem Bade in gelbstichig roten, lichtechten Tönen färbt. After drying, the new dye is a dark red powder that dissolves in water with a yellowish red color, in concentrated sulfuric acid with a violet color and colors wool from acid baths in yellowish red, lightfast shades.
CH226844D 1941-07-29 1941-07-29 Process for the preparation of an acidic disazo dye. CH226844A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH226844T 1941-07-29
CH223541T 1941-07-29

Publications (1)

Publication Number Publication Date
CH226844A true CH226844A (en) 1943-04-30

Family

ID=25726720

Family Applications (1)

Application Number Title Priority Date Filing Date
CH226844D CH226844A (en) 1941-07-29 1941-07-29 Process for the preparation of an acidic disazo dye.

Country Status (1)

Country Link
CH (1) CH226844A (en)

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