CH311499A - Process for the preparation of a disazo dye. - Google Patents

Process for the preparation of a disazo dye.

Info

Publication number
CH311499A
CH311499A CH311499DA CH311499A CH 311499 A CH311499 A CH 311499A CH 311499D A CH311499D A CH 311499DA CH 311499 A CH311499 A CH 311499A
Authority
CH
Switzerland
Prior art keywords
disazo dye
parts
red
preparation
orange
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 CH311499A publication Critical patent/CH311499A/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)
  • Paper (AREA)
  • Coloring (AREA)

Description

  

  Verfahren zur Herstellung eines     Disazofarbstoffes.       Es wurde gefunden, dass man zu einem  wertvollen     Disazofarbstoff    gelangt, wenn man       tetrazotiertes        4,4'-Diehlor-2,2'-diaminodiphe-          nylsulfon    beidseitig mit     2-Aminonaphthalin-          3,6-disulfonsäure    vereinigt.  



  Der neue     Disazofarbstoff    bildet ein rot  braunes Pulver, das sich in Wasser mit     rot-          oranger    Farbe löst und das Wolle aus sau  rem Bade in sehr lichtechten, orangeroten  Tönen färbt.  



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



  <I>Beispiel:</I>  8 Teile     4,4'-Dichlor-2,2'-diaminodiphenyl-          sulfon    werden in 100 Teilen heisser Essigsäure  gelöst. und bei 70  durch Zugabe von 15     Vo-          lumteilen        30o/oiger        Salzsäure    als feinverteil  tes Chlorhydrat gefällt.

   Der     Chlorhydratbrei     wird bei 5 bis 10  unter wirksamem Rühren  mit. 12,5     Volumteilen        4n-Natriumnitritlösung          tetrazotiert.    Anderseits werden 15,2 Teile       2-Aminonaphthalin-3,6-disulfonsäure    als     Di-          natriumsalz    in 400 Teilen Wasser gelöst und  noch mit 100     Volumteilen        4n-Natriumacetat-          lösung    und 5 Teilen Essigsäure versetzt. Man    lässt obige     Tetrazolösung    in einer halben  Stunde bei 20 bis 25  zu dieser Lösung flie  ssen und lässt noch 16 Stunden bei 20 bis 25   rühren.

   Der Farbstoff wird durch Zusatz von  100 Teilen     Natriumchlorid    bei 20  gefällt, ab  filtriert und nochmals in 100 Teilen sieden  dem Wasser gelöst. Der Farbstoff wird aus  dieser Lösung bei 23  mit 100     Volumteilen     gesättigter     Natriumchloridlösung    abgeschie  den,     abfiltriert    und getrocknet.



  Process for the preparation of a disazo dye. It has been found that a valuable disazo dye is obtained if tetrazotized 4,4'-diehlor-2,2'-diaminodiphenylsulfone is combined on both sides with 2-aminonaphthalene-3,6-disulfonic acid.



  The new disazo dye forms a red-brown 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 on the preparation of the tetrazo compounds to be used and the coupling conditions.



  <I> Example: </I> 8 parts of 4,4'-dichloro-2,2'-diaminodiphenylsulfone are dissolved in 100 parts of hot acetic acid. and at 70, precipitated as finely divided hydrochloric acid by adding 15 parts by volume of 30% hydrochloric acid.

   The chlorohydrate slurry becomes at 5 to 10 with effective stirring. 12.5 parts by volume of 4N sodium nitrite solution tetrazotized. On the other hand, 15.2 parts of 2-aminonaphthalene-3,6-disulfonic acid as disodium salt are dissolved in 400 parts of water and 100 parts by volume of 4N sodium acetate solution and 5 parts of acetic acid are added. The above tetrazo solution is allowed to flow into this solution at 20 to 25 in half an hour and is allowed to stir at 20 to 25 for a further 16 hours.

   The dye is precipitated by adding 100 parts of sodium chloride at 20, filtered off and redissolved in 100 parts of boiling water. The dye is deposited from this solution at 23 with 100 parts by volume of saturated sodium chloride solution, filtered off and dried.

Claims (1)

PATENTANSPRUCH: Verfahren zur Herstellung eines Disazo- farbstoffes, dadurch gekennzeichnet, dass man tetrazotiertes 4,4'-Dichlor-2,2'-diaminodiphe- nylsulfon beidseitig mit 2-Aminonaphthalin- 3,6-disulfonsäure vereinigt. Der neue Disazofarbstoff bildet ein rot braunes Pulver, das sich in Wasser mit rot- oranger Farbe löst und das Wolle aus sau rem Bade in sehr lichtechten, orangeroten Tönen färbt. Claim: Process for the production of a disazo dye, characterized in that tetrazotized 4,4'-dichloro-2,2'-diaminodiphenylsulfone is combined on both sides with 2-aminonaphthalene-3,6-disulfonic acid. The new disazo dye forms a red-brown powder that dissolves in water with a red-orange color and dyes the wool from an acid bath in very lightfast, orange-red tones. UINTTERANSPRUCH Verfahren gemäss Patentanspruch, da durch gekennzeichnet, dass die Kupplung in saurem Medium vorgenommen wird. UINTTER CLAIM Method according to patent claim, characterized in that the coupling is carried out in an acidic medium.
CH311499D 1952-12-16 1952-12-16 Process for the preparation of a disazo dye. CH311499A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH311499T 1952-12-16
CH309566T 1952-12-16

Publications (1)

Publication Number Publication Date
CH311499A true CH311499A (en) 1955-11-30

Family

ID=25735610

Family Applications (1)

Application Number Title Priority Date Filing Date
CH311499D CH311499A (en) 1952-12-16 1952-12-16 Process for the preparation of a disazo dye.

Country Status (1)

Country Link
CH (1) CH311499A (en)

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