CH194189A - Process for the preparation of a black disazo dye. - Google Patents

Process for the preparation of a black disazo dye.

Info

Publication number
CH194189A
CH194189A CH194189DA CH194189A CH 194189 A CH194189 A CH 194189A CH 194189D A CH194189D A CH 194189DA CH 194189 A CH194189 A CH 194189A
Authority
CH
Switzerland
Prior art keywords
black
dye
preparation
greenish
gray color
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 CH194189A publication Critical patent/CH194189A/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
    • C09B31/00—Disazo and polyazo dyes of the type A->B->C, A->B->C->D, or the like, prepared by diazotising and coupling
    • C09B31/02—Disazo dyes
    • C09B31/06—Disazo dyes from a coupling component "C" containing a directive hydroxyl group
    • C09B31/068—Naphthols
    • C09B31/072—Naphthols containing acid groups, e.g. —CO2H, —SO3H, —PO3H2, —OSO3H, —OPO2H2; Salts thereof

Landscapes

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

Description

  

  Verfahren zur Darstellung eines schwarzen     DisazofarbstofFes.       Es wurde gefunden, dass man einen neuen  wertvollen, schwarzen     Disazofarbstoff    erhält,  wenn man dianotierte     4-Amino-4'-methyldi-          phenylamin-2-sulfonsäure    mit     a-Naphthylamin     kuppelt, den     Monoazofarbetoff    wieder diano  tiert und mit     2,4-Naphtholsulfonsäure    ver  einigt.  



  Der neue Farbstoff, ein schwarzes Pulver,  löst sich in Wasser mit grüngrauer, in kon  zentrierter Schwefelsäure mit stumpf grün  stichig grauer Farbe und färbt Wolle und  Seide in schönen, grünlich schwarzen Tönen,  die auch in tiefen Färbungen nicht bronzieren.  <I>Beispiel:</I>  27,8 kg     4-Amino-4'-methyldiphenylamin-          2-sulfonsäure    werden wie üblich dianotiert,  mit einer kalten,     salzzauren    Aufschlämmung  von 14,3 kg     a-Naphthylamin    vereinigt und  mit     Natriumacetatlösung    die Mineralsäure  langsam     abgestumpft.    Nach beendeter Kup  plung wird der ausgeschiedene Farbstoff ab  filtriert,

   mit der nötigen Menge Natronlauge    ins     Natronsalz    übergeführt, mit 6,9 kg Nitrit  versetzt und durch langsames Eingiessen in  verdünnte Salzsäure und Eis bei 0   weiter  dianotiert. Nach beendeter Dianotierung wird  mit einer     sodaalkalischen    Lösung von     2-Naph-          tol-4-sulfonsäure    gekuppelt und nach mehr  stündigem Rühren der neue     Farbstoff    wie  üblich aufgearbeitet.  



  Der neue     Farbstoff,    ein schwarzes Pulver,  löst sich in Wasser mit grüngrauer, in kon  zentrierter Schwefelsäure mit stumpf grün  stichig grauer Farbe und färbt Wolle und  Seide in schönen, grünlich schwarzen Tönen,  die auch in tiefen Färbungen nicht bronzieren.



  Process for the preparation of a black disazo dye. It has been found that a new, valuable, black disazo dye is obtained when dianotated 4-amino-4'-methyldiphenylamine-2-sulfonic acid is coupled with a-naphthylamine, the monoazo dye is dianoed again and ver with 2,4-naphtholsulfonic acid agree.



  The new dye, a black powder, dissolves in water with a greenish-gray color, in concentrated sulfuric acid with a dull green, tinged gray color and dyes wool and silk in beautiful, greenish-black shades that do not bronze even in deep colors. <I> Example: </I> 27.8 kg of 4-amino-4'-methyldiphenylamine-2-sulfonic acid are dianotized as usual, combined with a cold, acidic hydrochloric suspension of 14.3 kg of a-naphthylamine and the mineral acid with sodium acetate solution slowly dulled. After the coupling has ended, the precipitated dye is filtered off,

   converted into the sodium salt with the necessary amount of sodium hydroxide solution, mixed with 6.9 kg of nitrite and further dianotized at 0 by slowly pouring into dilute hydrochloric acid and ice. When the dianotation is complete, the mixture is coupled with a soda-alkaline solution of 2-naphthol-4-sulfonic acid and, after several hours of stirring, the new dye is worked up as usual.



  The new dye, a black powder, dissolves in water with a greenish-gray color, in concentrated sulfuric acid with a dull green, tinged gray color and dyes wool and silk in beautiful, greenish-black shades that do not bronze even in deep colors.

Claims (1)

PATENTANSPRUCH: Verfahren zur Darstellung eines schwarzen Disazofarbstoffes, dadurch 'gekennzeichnet, dass man diazotäerte 4-Amino-4'-methyldiphe- nylamin-2-sulforisäure mit a-Naphthylamin kuppelt, den Monoazofarbstoff wieder diano tiert und mit 2,4-Naphtolsulfonsäure vereinigt. Claim: Process for the preparation of a black disazo dye, characterized in that diazotized 4-amino-4'-methyldiphenylamine-2-sulforic acid is coupled with α-naphthylamine, the monoazo dye is dianoed again and combined with 2,4-naphthol sulfonic acid. Der neue Farbstoff, ein schwarzes Pulver, löst sich in Wasser mit grüngrauer, in kon zentrierter Schwefelsäure mit stumpf grün stichig grauer Farbe und färbt Wolle und Seide in schönen, grünlich schwarzen Tönen, die auch in tiefen Färbungen nicht bronzie ren. The new dye, a black powder, dissolves in water with a greenish-gray color, and in concentrated sulfuric acid with a dull green, tinged gray color and dyes wool and silk in beautiful, greenish-black tones that do not bronze even in deep colors.
CH194189D 1936-04-29 1937-01-05 Process for the preparation of a black disazo dye. CH194189A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE194189X 1936-04-29

Publications (1)

Publication Number Publication Date
CH194189A true CH194189A (en) 1937-11-30

Family

ID=5743078

Family Applications (1)

Application Number Title Priority Date Filing Date
CH194189D CH194189A (en) 1936-04-29 1937-01-05 Process for the preparation of a black disazo dye.

Country Status (1)

Country Link
CH (1) CH194189A (en)

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