CH202437A - Process for the preparation of a water-soluble monoazo dye. - Google Patents

Process for the preparation of a water-soluble monoazo dye.

Info

Publication number
CH202437A
CH202437A CH202437DA CH202437A CH 202437 A CH202437 A CH 202437A CH 202437D A CH202437D A CH 202437DA CH 202437 A CH202437 A CH 202437A
Authority
CH
Switzerland
Prior art keywords
water
preparation
monoazo dye
soluble monoazo
brown
Prior art date
Application number
Other languages
German (de)
Inventor
Aktiengesellsc Farbenindustrie
Original Assignee
Ig Farbenindustrie Ag
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 Ig Farbenindustrie Ag filed Critical Ig Farbenindustrie Ag
Publication of CH202437A publication Critical patent/CH202437A/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
    • C09B29/00—Monoazo dyes prepared by diazotising and coupling
    • C09B29/24—Monoazo dyes prepared by diazotising and coupling from coupling components containing both hydroxyl and amino directing groups
    • C09B29/28—Amino naphthols
    • C09B29/30—Amino naphtholsulfonic acid

Landscapes

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

Description

  

  Verfahren zur Herstellung eines wasserlöslichen     ltionoazofarbstoffes.       Gegenstand des vorliegenden Zusatzpaten  tes ist ein Verfahren zur Herstellung eines  wasserlöslichen     Monoazofarbstoffes,    welches  dadurch gekennzeichnet     ist,    dass man     diazo-          tierte        4-Amino-3-sulfo-benzylsulfonsäure    mit  2 -     Phenilamino-    8     -naphthol-    6     -sulfonsäure    in  alkalischem Medium     vereinigt.            Beispiel:

         26,7     Gewichtsteile        4-Amino-3-sulfo-ben-          zylsulfonsäure    werden in Gegenwart von  überschüssiger Salzsäure auf übliche Weise       mit    6,9     Gewichtsteilen        Natriumnitrit        diazo-          tiert.    Die erhaltene     Diazolösung    wird bei       U      C in Gegenwart von überschüssigem     Na-          triumcarbonat    mit 3'5     Gewichtsteilen        2-phe-          nylamino-8-naphthol-6-sulfonsaurem    

  Natrium  vereinigt. Nach beendeter     Kupplung    wird  der Farbstoff abgeschieden und     getrocknet.       Er bildet     ein    schwarzbraunes Pulver, das  sich in Wasser mit brauner Farbe löst     und     Leder     in        braunen    Tönen gut durchfärbt.



  Process for the preparation of a water-soluble ionoazo dye. The subject of the present additional patent is a process for the production of a water-soluble monoazo dye, which is characterized in that diazotized 4-amino-3-sulfobenzylsulfonic acid is combined with 2-phenilamino-8-naphthol-6-sulfonic acid in an alkaline medium. Example:

         26.7 parts by weight of 4-amino-3-sulfo-benzylsulfonic acid are diazotized in the presence of excess hydrochloric acid in the usual way with 6.9 parts by weight of sodium nitrite. The diazo solution obtained is at U C in the presence of excess sodium carbonate with 3.5 parts by weight of 2-phenylamino-8-naphthol-6-sulfonic acid

  Sodium combined. When the coupling is complete, the dye is deposited and dried. It forms a black-brown powder, which dissolves in water with a brown color and dyes leather in brown tones.

Claims (1)

PATENTANSPRUCH: Verfahren zur Herstellung eines wasser löslichen Monoazofarbstoffes, dadurch ge kennzeichnet, dass man diazotierte 4-Amino- 3 - sulfo - benzylsulfonsäure mit 2 - Phenyl- amino - 8 - naphthol - 6 - sulf onsäure in alkali schem Medium vereinigt. Der so erhaltene Farbstoff bildet ein schwarzbraunes Pulver, das sich in Wasser mit brauner Farbe löst und Leder in braunen Tönen gut durchfärbt. PATENT CLAIM: Process for the preparation of a water-soluble monoazo dye, characterized in that diazotized 4-amino-3-sulfo-benzylsulfonic acid is combined with 2-phenyl-amino-8-naphthol-6-sulfonic acid in an alkaline medium. The dye obtained in this way forms a black-brown powder which dissolves in water with a brown color and dyes leather in brown tones.
CH202437D 1936-04-11 1937-04-05 Process for the preparation of a water-soluble monoazo dye. CH202437A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE202437X 1936-04-11
CH199187T 1938-08-15

Publications (1)

Publication Number Publication Date
CH202437A true CH202437A (en) 1939-01-15

Family

ID=25723228

Family Applications (1)

Application Number Title Priority Date Filing Date
CH202437D CH202437A (en) 1936-04-11 1937-04-05 Process for the preparation of a water-soluble monoazo dye.

Country Status (1)

Country Link
CH (1) CH202437A (en)

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