CH144493A - Process for preparing a coloring reaction product obtained from a monoazo dye. - Google Patents
Process for preparing a coloring reaction product obtained from a monoazo dye.Info
- Publication number
- CH144493A CH144493A CH144493DA CH144493A CH 144493 A CH144493 A CH 144493A CH 144493D A CH144493D A CH 144493DA CH 144493 A CH144493 A CH 144493A
- Authority
- CH
- Switzerland
- Prior art keywords
- reaction product
- product obtained
- preparing
- monoazo dye
- coloring reaction
- Prior art date
Links
Landscapes
- Coloring (AREA)
Description
Verfahren zur Darstellung eines aus einem 3Ion.oazofarbstoff erhaltenen, färbenden Reaktionsproduktes. Es wurde gefunden, dass ein wertvoller, brauner Farbstoff von noch unbekannter Konstitution entsteht, wenn man die Verbin dung ?-('.hloranilin-5-stilfosäure-azo-resorcin b(-i Gebenwart von wässerigem Ammoniak mit Oxydationsmitteln, vorzugsweise mit Luft behandelt. Der neue Farbstoff stellt ein dunkles Pulver dar, das sich in Wasser mit gelbbrauner, in konzentrierter Schwe felsäure mit brauner Farbe löst.
Im Gegen satz zum Ausgangsfarbstoff färbt er Wolle und Seide kaum mehr an, dagegen erzeugt er auf Leder ein schönes, sattes Braun, des sen Farbton von dem Grade der Oxydation abhängig ist. Diese Lederfärbungen sind ausgezeichnet durch hervorragende Echtheit gegen Licht und alkalischen Fettliquor. <I>Beispiel:</I> Eine Lösung von 34 'feilen des Monoazo- farbstoffes aus 2-Chloranilin-5-sulfosäure und Resorcin in 100-150 Teilen Wasser wird mit 30-50 Teilen Ammoniak von 20 % versetzt und bei zirka<B>80'</B> C unter Rühren Luft durchgeleitet. Die anfänglich gelb orange Lösung wird bald tiefbraun.
Die Oxydation ist beendet, wenn Nuance und Stärke der Lösung sich nicht mehr ändern, was nach einigen Stunden der Fall ist. Als dann wird mit Salzsäure angesäuert, mit Kochsalz gefällt, filtriert und getrocknet. Der Farbstoff kann auch direkt durch Ein dampfen der ammoniakalischen Lösung ge wonnen werden.
Process for the preparation of a coloring reaction product obtained from a 3ion oazo dye. It has been found that a valuable, brown dye of as yet unknown constitution is formed when the compound? - ('. Chloroaniline-5-stilfosäure-azo-resorcinol b (-i the supply of aqueous ammonia is treated with oxidizing agents, preferably with air The new dye is a dark powder that dissolves in water with a yellow-brown color, and in concentrated sulfuric acid with a brown color.
In contrast to the original dye, it hardly stains wool and silk, but on leather it produces a beautiful, rich brown, the color of which depends on the degree of oxidation. These leather dyeings are distinguished by their excellent fastness to light and alkaline fatty liquor. <I> Example: </I> A solution of 34 'files of the monoazo dye composed of 2-chloroaniline-5-sulfonic acid and resorcinol in 100-150 parts of water is mixed with 30-50 parts of ammonia at 20% and at about < B> 80 '</B> C air passed through with stirring. The initially yellow-orange solution soon turns deep brown.
The oxidation is over when the shade and strength of the solution no longer change, which is the case after a few hours. As is then acidified with hydrochloric acid, precipitated with common salt, filtered and dried. The dye can also be obtained directly by evaporating the ammoniacal solution.
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE144493X | 1928-02-20 | ||
CH142445T | 1932-02-04 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH144493A true CH144493A (en) | 1930-12-31 |
Family
ID=25714055
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH144493D CH144493A (en) | 1928-02-20 | 1929-02-18 | Process for preparing a coloring reaction product obtained from a monoazo dye. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH144493A (en) |
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1929
- 1929-02-18 CH CH144493D patent/CH144493A/en unknown
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