CH144496A - 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
- CH144496A CH144496A CH144496DA CH144496A CH 144496 A CH144496 A CH 144496A CH 144496D A CH144496D A CH 144496DA CH 144496 A CH144496 A CH 144496A
- Authority
- CH
- Switzerland
- Prior art keywords
- reaction product
- product obtained
- dye
- preparing
- coloring reaction
- Prior art date
Links
Landscapes
- Coloring (AREA)
Description
Verfahren zur Darstellung eines aus einem lilonoazofarbstoff erhaltenen, färbenden Reaktionsproduktes. Es wurde gefunden, dass ein wertvoller, brauner Farbstoff von noch unbekannter Konstitution entsteht, wenn man die Verbin dung Amidonaphtolsulfosäure - ?,8,6 - azo- resorcin bei Gegenwart von wässerigem Am- tnoniak mit Oxydationsmitteln, vorzugsweise rnit Luft,
behandelt. Der neue Farbstoff stellt ein dunkles Pulver dar, das sich in Wasser mit rotbrauner, in konzentrierter Schwefelsäure mit. braunviolc@iter Farbe löst. Im Gegensatz zum Ausgangsfarbstoff färbt \er Wolle und Seide kaum mehr an, dagegen erzeugt er auf Leder ein schönes. sattes Braun, dessen Farbton von dem Grade der Oxydation abhängig ist. Diese Lederfärbun gen sind ausgezeichnet durch hervorragende Echtheit gegen Licht und alkalischen Fett liquor.
<I>Beispiel:</I> Eine Lösung von 2=r Teilen des @iono- azofarbstoffes aus Amidonaphtolsulfosäure- 3,8,6 und Resorcin in 100-150 Teilen Was- ser wird mit 80-50 Teilen Ammoniak von ?0% versetzt und bei zirka 80 C- unter Rühren Luft durchgeleitet. Die anfänglich 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 Hochsalz gefällt, filtriert und getrocknet. Der Farbstoff kann auch direkt durch Ein dämpfen der ammoniakalischen Lösung ge wonnen werden.
Process for preparing a coloring reaction product obtained from a lilonoazo dye. It has been found that a valuable brown dye of as yet unknown constitution is formed if the compound amidonaphtholsulfonic acid -?, 8,6 - azo-resorcinol is used in the presence of aqueous ammonia with oxidizing agents, preferably with air,
treated. The new dye is a dark powder that dissolves in water with red-brown, in concentrated sulfuric acid with. Braunviolc @ iter color dissolves. In contrast to the original dye, it hardly stains wool and silk, but creates a beautiful color on leather. deep brown, the color of which depends on the degree of oxidation. These leather dyes are distinguished by their excellent fastness to light and alkaline liquor.
<I> Example: </I> A solution of 2 = r parts of the @ionoazo dye from amidonaphtholsulfonic acid 3,8,6 and resorcinol in 100-150 parts of water is mixed with 80-50 parts of ammonia of? 0% added and air passed through at about 80 C- with stirring. The initially 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.
Then it is acidified with hydrochloric acid, precipitated with high salt, filtered and dried. The dye can also be obtained directly by steaming the ammoniacal solution.
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE144496X | 1928-02-20 | ||
CH142445T | 1932-02-04 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH144496A true CH144496A (en) | 1930-12-31 |
Family
ID=25714058
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH144496D CH144496A (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) | CH144496A (en) |
-
1929
- 1929-02-18 CH CH144496D patent/CH144496A/en unknown
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