CH194455A - Process for the preparation of a monoazo dye. - Google Patents

Process for the preparation of a monoazo dye.

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Publication number
CH194455A
CH194455A CH194455DA CH194455A CH 194455 A CH194455 A CH 194455A CH 194455D A CH194455D A CH 194455DA CH 194455 A CH194455 A CH 194455A
Authority
CH
Switzerland
Prior art keywords
amino
monoazo dye
dye
preparation
monoazo
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 CH194455A publication Critical patent/CH194455A/en

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Description

  

  Verfahren zur Herstellung eines     Monoazofarbstoffes.       Es wurde gefunden,     dass:    man zu neuen       Monoazofarbstoffen    gelangt, wenn man in  an sich bekannter Weise auf<B>1.</B>     7-Amino-          naphthol    in saurer Lösung     Diazoverbindun-          gen    einwirken lässt, die     frei    von     was:

  serlös-          lichmachenden    Gruppen sind.     Diese        in    ver  dünnten     Alkalien.    löslichen     Monoazoverbin-          dungen        besitzen    überraschenderweise.     eine          gute    Affinität zur     Baumwollfaser.        Diese     nicht     vorausztxsehend-e        Eigenschaft    macht sie  besonders geeignet für die     Herstellung    von  Farbstoffen auf der     Faser        (Eisfarben).     



  Gegenstand des vorliegenden Patentes     ist     ein Verfahren zur Herstellung     ,eines        Mono-          azofarbstoffes.    Das Verfahren ist dadurch       ge#kennzeiehnet,    dass man     diazotiertes    2  Nitranilin mit     1-Amino-7-ogynaphthalin    in  saurer Lösung kuppelt.  



  Der erhaltene neue     Honoazofarbstoff        4-          (2'-Nitrobenzol)-azo-l-amino-7-ogynaplhthalin     ist in Wasser unlöslich, löst sich in ver  dünnten Alkalien und besitzt eine     gute          Affinität    zur     Faser.            Beispiel;          In        eine        eiskalte    Lösung von 175 g     1-          Amino-7-ogynaphthalin    in     verdünnter    Salz  säure wird die in     bekannter        Weise    aus 13:

  8 g       2-Nitranilin    hergestellte     Diazolösung        einge-          rührt.    Bei     ,schwach    kongosaurer     Reaktion          tritt        schnelle        Farbstoffbil.dung        ein.    Der in       Wasser        unlösliche    rotbraune     Monoazofarb-          stoff        4-(2'-Nitrobenzol)

  -azo-l-amino-7-ogy-          naphthalin    wird     in    üblicher     Weise        isoliert.          Substantivität    auf     Baumwolle:        2.0%.  



  Process for the preparation of a monoazo dye. It has been found that: New monoazo dyes are obtained if diazo compounds are allowed to act on <B> 1. </B> 7-amino naphthol in an acidic solution in a manner known per se, which are free of what:

  are solubilizing groups. These in dilute alkalis. Surprisingly, they have soluble monoazo compounds. a good affinity for cotton fiber. This non-predictive property makes them particularly suitable for the production of dyes on the fiber (ice colors).



  The present patent relates to a process for the production of a monoazo dye. The process is characterized in that diazotized 2-nitroaniline is coupled with 1-amino-7-ogynaphthalene in acidic solution.



  The new honoazo dye 4- (2'-nitrobenzene) -azo-1-amino-7-ogynaplhthalene obtained is insoluble in water, dissolves in dilute alkalis and has a good affinity for fibers. Example; In an ice-cold solution of 175 g of 1- amino-7-ogynaphthalene in dilute hydrochloric acid is obtained in the known manner from 13:

  8 g of 2-nitroaniline prepared diazo solution were stirred in. In the case of a weak Congo acid reaction, rapid dye formation occurs. The water-insoluble red-brown monoazo dye 4- (2'-nitrobenzene)

  -azo-1-amino-7-ogynaphthalene is isolated in the usual way. Substantivity on cotton: 2.0%.

Claims (1)

PATENTANSPRUCH: Verfahren zur Herstellung eines Mono- azofarbstoffes, dadurch ,gekennzeichnet, dass man diazotiertes 2.-Nitranilin mit 1-Amino- 7-ogynaphthalin in saurer Lösung kuppelt. Claim: Process for the production of a monoazo dye, characterized in that diazotized 2.-nitroaniline is coupled with 1-amino-7-ogynaphthalene in acidic solution. Der .erhaltene neue 3lonoazofarbstoff 4- (2'-Nitrobenzol)-azo-l-amino- 7-ogynaphtha- lin ist in Wasser unlöslich, löst sich in ver- dünnten Alkalien und besitzt eine gute Affinität zur Faser. The new 3lonoazo dye 4- (2'-nitrobenzene) -azo-1-amino-7-ogynaphthalin obtained is insoluble in water, dissolves in dilute alkalis and has a good affinity for fibers.
CH194455D 1935-08-16 1936-07-30 Process for the preparation of a monoazo dye. CH194455A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE194455X 1935-08-16
CH194455T 1936-07-30

Publications (1)

Publication Number Publication Date
CH194455A true CH194455A (en) 1937-12-15

Family

ID=25722678

Family Applications (1)

Application Number Title Priority Date Filing Date
CH194455D CH194455A (en) 1935-08-16 1936-07-30 Process for the preparation of a monoazo dye.

Country Status (1)

Country Link
CH (1) CH194455A (en)

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