CH311498A - Process for the preparation of a disazo dye. - Google Patents

Process for the preparation of a disazo dye.

Info

Publication number
CH311498A
CH311498A CH311498DA CH311498A CH 311498 A CH311498 A CH 311498A CH 311498D A CH311498D A CH 311498DA CH 311498 A CH311498 A CH 311498A
Authority
CH
Switzerland
Prior art keywords
red
disazo dye
parts
orange
preparation
Prior art date
Application number
Other languages
German (de)
Inventor
Aktiengesellschaft Ciba
Original Assignee
Ciba Geigy
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 Ciba Geigy filed Critical Ciba Geigy
Publication of CH311498A publication Critical patent/CH311498A/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
    • C09B35/227—Disazo dyes characterised by the tetrazo component the tetrazo component being a derivative of a diaryl sulfide or a diaryl polysulfide

Landscapes

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

Description

  

  Zusatzpatent zum Hauptpatent Nr. 309566.    Verfahren     zur    Herstellung eines     Disazofarbstoffes.       Es wurde gefunden dass man zu einem  wertvollen     Disazofarbstoff    gelangt, wenn man       tetrazotiertes        4,4'-Dichlor-2,2'-diaminodiphe-          nyisulfoxyd    beidseitig mit     2-Aminonaphtha-          lin-3,6-disulfonsäure    vereinigt.  



  Der neue     Disazofarbstoff    bildet ein. braun  rotes Pulver, das sich in Wasser mit     rotoran-          ger    Farbe löst und das Wolle aus saurem  Bade in sehr lichtechten orangeroten Tönen  färbt.  



  Über die Herstellung der zu verwenden  den     Tetrazoverbindungen    und über die Kupp  lungsbedingungen gibt das Hauptpatent Aus  kunft.  



  <I>Beispiel:</I>  Man trägt bei 0 bis 5  2,2 Teile Natrium  nitrit in 36 Teile konzentrierte Schwefelsäure  ein und verrührt hierauf bei 80  bis zur  Lösung. Bei 10 bis 20  werden hierauf 4,7       i    Teile     4,4'-Dichlor-2,2'-diaminodiphenylsulf-          oxyd    langsam eingetragen, worauf man bei  25 bis 35  verrührt, bis die Substanz gelöst  ist.

   Nach dem Austragen auf 100 Teile Eis  lässt man die gegebenenfalls geklärte Tetrazo-         lösung    zur Lösung von 9,5 Teilen     2-Amino-          naphthalin    - 3,6 -     disulfonsäure    in 200 Teilen  Wasser und 400     Volumteilen        4n-Natriumace-          tatlösung    fliessen. Der rotorange Farbstoff  wird nach einiger Zeit     abfiltriert,    nochmals  in 150 Teilen siedendem Wasser gelöst und  bei 60  mit 80     Volumteilen    gesättigter Na  triumchloridlösung ausgefällt     und        abfiltriert.  



  Additional patent to main patent No. 309566. Process for the production of a disazo dye. It has been found that a valuable disazo dye is obtained if tetrazotized 4,4'-dichloro-2,2'-diaminodiphenyisulfoxide is combined on both sides with 2-aminonaphthalin-3,6-disulfonic acid.



  The new disazo dye forms a. Brown-red powder that dissolves in water with a red-orange color and dyes the wool from an acid bath in very lightfast orange-red tones.



  The main patent provides information about the manufacture of the tetrazo compounds to be used and the coupling conditions.



  <I> Example: </I> At 0 to 5, 2.2 parts of sodium nitrite are added to 36 parts of concentrated sulfuric acid and the mixture is then stirred at 80 to dissolve. At 10 to 20, 4.7 parts of 4,4'-dichloro-2,2'-diaminodiphenylsulphoxide are then slowly introduced, whereupon the mixture is stirred at 25 to 35 until the substance has dissolved.

   After pouring onto 100 parts of ice, the optionally clarified tetrazo solution is allowed to flow to dissolve 9.5 parts of 2-aminonaphthalene-3,6-disulfonic acid in 200 parts of water and 400 parts by volume of 4N sodium acetate solution. The red-orange dye is filtered off after some time, dissolved again in 150 parts of boiling water and precipitated at 60 with 80 parts by volume of saturated sodium chloride solution and filtered off.

Claims (1)

PATENTANSPRUCH: Verfahren zur Herstellung eines Disazo- farbstoffes, dadurch gekennzeichnet, dass man ; tetrazotiertes 4,4'-Dichlor-2,2'-diaminodiphe- nylsulfoxyd beidseitig mit 2-Aminonaphtha- lin-3,6-disulfonsäure vereinigt. Der neue Disazofarbstoff bildet ein. braun rotes Pulver, das sich in Wasser mit rotoran-, ger Farbe löst und das Wolle aus saurem Bade in sehr lichtechten orangeroten Tönen färbt. PATENT CLAIM: Process for the production of a disazo dye, characterized in that one; Tetrazotized 4,4'-dichloro-2,2'-diaminodiphenylsulfoxide combined on both sides with 2-aminonaphthalin-3,6-disulfonic acid. The new disazo dye forms a. brown-red powder that dissolves in water with a red-orange, red color and dyes the wool from acid baths in very lightfast orange-red tones. UNTERANSPRUCH: Verfahren gemäss Patentanspruch, da durch gekennzeichnet, dass die Kupplung in saurem Medium vorgenommen wird. SUBClaim: Method according to claim, characterized in that the coupling is carried out in an acidic medium.
CH311498D 1952-12-16 1952-12-16 Process for the preparation of a disazo dye. CH311498A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH311498T 1952-12-16
CH309566T 1952-12-16

Publications (1)

Publication Number Publication Date
CH311498A true CH311498A (en) 1955-11-30

Family

ID=25735609

Family Applications (1)

Application Number Title Priority Date Filing Date
CH311498D CH311498A (en) 1952-12-16 1952-12-16 Process for the preparation of a disazo dye.

Country Status (1)

Country Link
CH (1) CH311498A (en)

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