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CH226840A - Process for the preparation of an acidic disazo dye. - Google Patents

Process for the preparation of an acidic disazo dye.

Info

Publication number
CH226840A
CH226840A CH226840DA CH226840A CH 226840 A CH226840 A CH 226840A CH 226840D A CH226840D A CH 226840DA CH 226840 A CH226840 A CH 226840A
Authority
CH
Switzerland
Prior art keywords
acidic
preparation
disazo dye
dye
tetrazotized
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 CH226840A publication Critical patent/CH226840A/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     Disazofarbstoffes.       Gegenstand des vorliegenden Zusatz  patentes ist ein Verfahren zur Darstellung  eines sauren     Disazofarbstoffes,    dadurch ge  kennzeichnet,     daB    man     4,4'-Dichlor-2,2'-di-          aminodiphenylsulfon        tetrazotiert    und die       Tetrazoverbindung        mit    2     Mol        2-Amino-8-          oxynaphthalin-6=sulfonsäure    in saurer Lö  sung kuppelt.  



       Beispiel:     31,6 Teile     4,4'-Dichlor-2,2'-diaminodiphe-          nyIsulfon    werden in üblicher Weise     tetrazo-          tiert.    Die     Tetrazoniumlösung    kuppelt man  mit 47,8 Teilen     2-Amino-8-ogynaphthalin-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 erfolgt langsam, durch Erwär  men und Zusatz von     Natriumacetat    kann sie  jedoch     beschleunigt    werden.

   Nach Beendi  gung der     Farbstoffbildung    stellt man mit         Sodalösung        kongoneutral,    filtriert und trock  net. Der Farbstoff, ein dunkelrotes Pulver,  löst sich in Wasser blaustichig rot, in kon  zentrierter Schwefelsäure rot und     färbtWolle     aus saurem Bade in blaustichig roten, licht  echten Tönen.



  <B> Additional patent </B> to 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'-dichloro-2,2'-di-aminodiphenylsulfone is tetrazotized and the tetrazo compound with 2 moles of 2-amino-8-oxynaphthalene 6 = sulfonic acid in acidic solution couples.



       Example: 31.6 parts of 4,4'-dichloro-2,2'-diaminodipheny-sulfone are tetrazotized in the usual way. The tetrazonium solution is coupled with 47.8 parts of 2-amino-8-ogynaphthalene-6-sulfonic acid, which has been dissolved neutrally 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 is slow, but it can be accelerated by heating and adding sodium acetate.

   After the formation of the dye has ended, it is Congoneutral with soda solution, filtered and dried. The dye, a dark red powder, dissolves in water with a bluish red tint, in concentrated sulfuric acid it dissolves red and dyes wool from an acid bath in bluish red, light shades.

Claims (1)

PATENTANSPRUCH: Verfahren zur Darstellung eines sauren Disazofarbstoffes, dadurch gekennzeichnet, daB man 4,4'-Dichlor-2,2'-diaminodiphenyl- sulfon tetrazotiert und die Tetrazoverbindung mit 2 Mol 2-Amino-8-ogynaphthalin-6-sulf on- säure in saurer Lösung kuppelt. Der neue Farbstoff stellt nach dem Trock nen ein dunkelrotes Pulver dar, das sich in Wasser mit blaustichig roter, in konzentrier ter Schwefelsäure mit roter Farbe löst und Wolle aus saurem Bade in blaustichig roten, lichtechten Tönen färbt. Claim: Process for the preparation of an acidic disazo dye, characterized in that 4,4'-dichloro-2,2'-diaminodiphenylsulfone is tetrazotized and the tetrazo compound is tetrazotized with 2 moles of 2-amino-8-ogynaphthalene-6-sulfonic acid couples in acidic solution. After drying, the new dye is a dark red powder that dissolves in water with a bluish red color, in concentrated sulfuric acid with a red color and dyes wool from an acid bath in bluish red, lightfast shades.
CH226840D 1941-07-29 1941-07-29 Process for the preparation of an acidic disazo dye. CH226840A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH226840T 1941-07-29
CH223541T 1941-07-29

Publications (1)

Publication Number Publication Date
CH226840A true CH226840A (en) 1943-04-30

Family

ID=25726716

Family Applications (1)

Application Number Title Priority Date Filing Date
CH226840D CH226840A (en) 1941-07-29 1941-07-29 Process for the preparation of an acidic disazo dye.

Country Status (1)

Country Link
CH (1) CH226840A (en)

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