CH198886A - Process for the preparation of an azo dye. - Google Patents
Process for the preparation of an azo dye.Info
- Publication number
- CH198886A CH198886A CH198886DA CH198886A CH 198886 A CH198886 A CH 198886A CH 198886D A CH198886D A CH 198886DA CH 198886 A CH198886 A CH 198886A
- Authority
- CH
- Switzerland
- Prior art keywords
- preparation
- azo dye
- oxynaphthalene
- methylamino
- dye
- Prior art date
Links
Landscapes
- Coloring (AREA)
Description
Verfahren zur Herstellung eines Azofarbstoffes. Im Hauptpatent ist die Herstellung neuer Monoazofarbstoffe beschrieben, die in der Weise erfolgt, dass man in an sich bekannter Weise auf 1,7-Aminonaphthole in saurer Lö sung Diazoverbindungen einwirken lässt, die frei von wasserlöslich machenden Gruppen sind. Die so erhältlichen Monoazoverbindun- gen besitzen eine gute Affinität zur Baum- wollfaser, so dass sie besonders geeignet für die Herstellung von Azofarbstoffen auf der Faser sind.
Es wurde nun gefunden, dass man Mono- azoverbindungen ebenfalls guter Affinität zur pflanzlichen Faser erhält, wenn man bei dem Verfahren des Hauptpatentes das 1,7- Aminonaphthol durch seine N-Alkyl- oder N-Aryl-Substitutionsprodukte ersetzt.
Gegenstand des vorliegenden Patentes ist ein Verfahren zur Herstellung eines Azo- farbstoffes. Das Verfahren besteht darin, dass man diazotiertes 2-Nitranilin mit 1-Methyl- amino-7-oxynaphthalin in saurer Lösung kuppelt. Der neue Monoazofarbstoff 4-(2'- Nitrobenzolazo) -1-methylamino-7-oxynaph- thalin ist in Wasser unlöslich, löslich in ver- dünnten Alkalien und besitzt gute Affinität zur Faser.
<I>Beispiel:</I> In eine eiskalte Lösung von 182 g 1 Me- thylamino-7-oxynaphthalin in verdünnter Salzsäure wird die in bekannter Weise aus 138 g ' 2-Nitranilin hergestellte Diazolösung eingerührt. Bei schwach kongosaurer Reak tion tritt schnelle Farbstoffbildung ein. Der in Wasser unlösliche braunrote Monoazo- farbstoff 4 - (2' - Nitrobenzolazo) -1- methyl- amino-7-oxynaphthalin wird in üblicher Weise isoliert.
Process for the preparation of an azo dye. The main patent describes the preparation of new monoazo dyes, which is carried out in such a way that diazo compounds which are free of water-solubilizing groups can act in an acidic solution on 1,7-aminonaphthols in a manner known per se. The monoazo compounds obtainable in this way have a good affinity for cotton fibers, so that they are particularly suitable for the production of azo dyes on the fiber.
It has now been found that monoazo compounds that have a good affinity for vegetable fibers are obtained if, in the process of the main patent, the 1,7-aminonaphthol is replaced by its N-alkyl or N-aryl substitution products.
The present patent relates to a process for the production of an azo dye. The process consists in coupling diazotized 2-nitroaniline with 1-methylamino-7-oxynaphthalene in acidic solution. The new monoazo dye 4- (2'-nitrobenzolazo) -1-methylamino-7-oxynaphthalene is insoluble in water, soluble in dilute alkalis and has a good affinity for fibers.
<I> Example: </I> The diazo solution prepared in a known manner from 138 g of 2-nitroaniline is stirred into an ice-cold solution of 182 g of 1-methylamino-7-oxynaphthalene in dilute hydrochloric acid. In the case of a weak Congo acid reaction, rapid dye formation occurs. The red-brown monoazo dye 4 - (2 '- nitrobenzolazo) -1-methyl-amino-7-oxynaphthalene, which is insoluble in water, is isolated in the customary manner.
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE198886X | 1935-10-11 | ||
CH194455T | 1936-07-30 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH198886A true CH198886A (en) | 1938-07-15 |
Family
ID=25722679
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH198886D CH198886A (en) | 1935-10-11 | 1936-09-11 | Process for the preparation of an azo dye. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH198886A (en) |
-
1936
- 1936-09-11 CH CH198886D patent/CH198886A/en unknown
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