CH199786A - Process for the preparation of a new, water-soluble monoazo dye. - Google Patents
Process for the preparation of a new, water-soluble monoazo dye.Info
- Publication number
- CH199786A CH199786A CH199786DA CH199786A CH 199786 A CH199786 A CH 199786A CH 199786D A CH199786D A CH 199786DA CH 199786 A CH199786 A CH 199786A
- Authority
- CH
- Switzerland
- Prior art keywords
- water
- new
- preparation
- monoazo dye
- soluble monoazo
- Prior art date
Links
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- Coloring (AREA)
Description
Verfahren zur Herstellung eines neuen, wasserlöslichen Monoazofarbstoffes. Die vorliegende Erfindung bezieht sich auf ein Verfahren zur Herstellung eines neuen, wasserlöslichen Monoazofarbstoffes, dadurch gekennzeichnet, dass der diazotierte Schwefelsäureester des p-Aminophenyl-ss- oxy äthyläthers mit p-Kresol gekuppelt wird.
Der neue Farbstoff ist ein gelbes Pulver; das in Wasser eine gelbe und in konzentrier ter Schwefelsäure eine rote Lösung gibt. Er färbt Acetatkunstseide aus wässeriger Lö sung in grünlich-gelben Tönen.
<I>Beispiel:</I> 23g3 Teile des ;Schwefelsäureesters des p - Aminophenyl - ss - oxyäthyläthens, welcher durch Behandlung des p - Aminophenyl- ss - oxyäthyläthers mit Schwefelsäuremono- hydrat erhalten wurde, werden bei 10 bis 15 C, nach iSuspension in 300 Tei len Wasser, .das 25 Teile 36%ige Salzsäure enthält,
durch Zufügung von 7 Teilen Na triumnitrit diazotiert. Die so erhaltene Lö sung der Diazoverbindung wird auf 5'C gekühlt und dann zu einer eiskalten Lösung von 10,8 Teilen p-Kresol in 300 Teilen Wasser, dem 4 Teile kaustische Soda und 31 Teile I,Tatriumkarbonat zugefügt worden waren, gegeben. Das Reaktionsgemisch wird stets gekühlt und bis zur vollständigen Ver bindung umgerührt.
Hierauf wird es auf <B>50'C</B> erwärmt, es werden 25 Teile gewöhn liches Salz beigefügt, und der dadurch aus gefällte Farbstoff wird dann abfiltriert. Der Farbstoff kann als Paste aufbewahrt oder auf die übliche Weise getrocknet werden.
Process for the preparation of a new, water-soluble monoazo dye. The present invention relates to a process for the preparation of a new, water-soluble monoazo dye, characterized in that the diazotized sulfuric acid ester of p-aminophenyl-ss-oxy ethyl ether is coupled with p-cresol.
The new dye is a yellow powder; which gives a yellow solution in water and a red solution in concentrated sulfuric acid. It dyes acetate silk from aqueous solution in greenish-yellow tones.
<I> Example: </I> 23g3 parts of the sulfuric acid ester of p-aminophenyl-ss-oxyethylethens, which was obtained by treating the p-aminophenyl-ss-oxyethylether with sulfuric acid monohydrate, are at 10 to 15 ° C. after suspension in 300 parts of water containing 25 parts of 36% hydrochloric acid,
diazotized by adding 7 parts of sodium nitrite. The solution of the diazo compound thus obtained is cooled to 5 ° C. and then added to an ice-cold solution of 10.8 parts of p-cresol in 300 parts of water, to which 4 parts of caustic soda and 31 parts of sodium carbonate have been added. The reaction mixture is always cooled and stirred until it is completely bonded.
It is then heated to <B> 50'C </B>, 25 parts of common salt are added, and the color that precipitates out is then filtered off. The dye can be stored as a paste or dried in the usual way.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB199786X | 1935-12-05 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH199786A true CH199786A (en) | 1938-09-15 |
Family
ID=10138304
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH199786D CH199786A (en) | 1935-12-05 | 1936-11-18 | Process for the preparation of a new, water-soluble monoazo dye. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH199786A (en) |
-
1936
- 1936-11-18 CH CH199786D patent/CH199786A/en unknown
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