CH144494A - 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
- CH144494A CH144494A CH144494DA CH144494A CH 144494 A CH144494 A CH 144494A CH 144494D A CH144494D A CH 144494DA CH 144494 A CH144494 A CH 144494A
- Authority
- CH
- Switzerland
- Prior art keywords
- dye
- product obtained
- reaction product
- preparing
- monoazo dye
- Prior art date
Links
Landscapes
- Coloring (AREA)
Description
Verfahren zur Darstellung eines aus einem Honoazofarbstoff erhaltenen, färbenden Reaktionsproduktes. <B>Es</B> wurde gefunden, dass ein wertvoller, brauner Farbstoff von noch unbekannter Konstitution entsteht, wenn man den aus einem Gemisch von diazotierter <B>1,6-</B> und 1,7- Naphtylaminsulfosäure und Resorein erhält lichen Monoazofarbstoff bei Gegenwart von wässerigem Ammoniak mit Oxydationsmit teln, vorzugsweise mit Luft, behandelt. Der neue Farbstoff stellt ein dunkles Pulver dar, das sich in Wasser mit brauner, in konzen trierter Schwefelsäure mit violetter Farbe löst.
Im Gegensatz zum Ausgangsfarbstoff färbt er Wolle und Seide kaum mehr an, da gegen erzeugt er auf Leder ein schönes, sat tes Braun, dessen Farbton von dem Grade der Oxydation abhängig ist. Diese Leder färbungen sind ausgezeichnet durch hervor ragende Echtheit gegen Licht und alka lischen Fettliquor.
<I>Beispiel:</I> Eine Lösung von 24 Teilen des aus einem Gemisch von diazotierter <B>1,6-</B> und 1,7-Naph- tYlaminsuliosäure und Resorein erhältlichen Monoazofarbstoffes in<B>100-150</B> Teilen Was ser wird mit<B>30-50</B> Teilen Ammoniak von 20<B>%</B> versetzt und bei zirka<B>80 ' C</B> unter Rühren Luft durchgeleitet. Die anfänglich orange Lösung wird bald tiefbraun.<B>-</B> 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 preparing a coloring reaction product obtained from a honoazo dye. <B> It </B> has been found that a valuable, brown dye of as yet unknown constitution is formed when one is made from a mixture of diazotized <B> 1,6 </B> and 1,7-naphthylamine sulfonic acids and resorein obtainable monoazo dye in the presence of aqueous ammonia with Oxidationsmit means, preferably with air, treated. The new dye is a dark powder that dissolves in water with a brown color, and in concentrated sulfuric acid with a purple color.
In contrast to the original dye, it hardly stains wool and silk, whereas it creates a beautiful, rich brown on leather, the color of which depends on the degree of oxidation. These leather dyes are distinguished by their excellent fastness to light and alkaline fatty liquor.
<I> Example: </I> A solution of 24 parts of the monoazo dye obtainable from a mixture of diazotized 1,6- and 1,7-naphthyllaminsulioic acid and resorein in <B> 100-150 <B> 30-50 </B> parts of ammonia of 20 <B>% </B> are added to parts of water and air is passed through at around <B> 80 'C </B> while stirring. The initially orange solution soon turns deep brown. <B> - </B> 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 |
---|---|---|---|
DE144494X | 1928-02-20 | ||
CH142445T | 1932-02-04 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH144494A true CH144494A (en) | 1930-12-31 |
Family
ID=25714056
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH144494D CH144494A (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) | CH144494A (en) |
-
1929
- 1929-02-18 CH CH144494D patent/CH144494A/en unknown
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