CH194955A - Process for the preparation of a new monoazo dye. - Google Patents
Process for the preparation of a new monoazo dye.Info
- Publication number
- CH194955A CH194955A CH194955DA CH194955A CH 194955 A CH194955 A CH 194955A CH 194955D A CH194955D A CH 194955DA CH 194955 A CH194955 A CH 194955A
- Authority
- CH
- Switzerland
- Prior art keywords
- preparation
- monoazo dye
- yellow
- new monoazo
- new
- Prior art date
Links
Landscapes
- Coloring (AREA)
Description
Verfahren zur Herstellung eines neuen bl(onoazofarbstoffes. Vorliegende Erfindung betrifft die Her stellung eines neuen Monoazofarbstoffes, wel cher auf Wolle gelbe, intensivem Waschen, Walken und Licht in ausgezeichneter Weise widerstehende Töne erzeugt.
Gemäss vorliegendem Verfahren wird der Farbstoff durch Kuppeln von dianotiertem Dodecyl-m-aminobenzoat mit 1-(4'-Sulfophe- nyl)-3-methyl-5-pyrazolon erhalten.
Beispiel: 30,5 Gewichtsteile Dodecyl-rn-aminoben- zoat werden als Suspension in 250 Gewichts- teilen Wasser und 26 Gewichtsteilen 36 %- iger Salzsäure durch Zugabe von 7 Gewichts teilen Natriumnitrit dianotiert.
Die gebildete Diazosuspension fügt man zu einer gekühlten, wässerigen Lösung (5 0 C.) von 25,4 Gewichts teilen 1-(4'.Sulfophenyl).3-methyl-5-pyrazolon, die während des Zusetzens mittels Soda gegen Lackmus alkalisch gehalten wird. Die Kupp lungsreaktion geht rasch von statten.
Der neue, so erhaltene Farbstoff wird mit 5 % Salz (Gewicht. für Volumen) ausgesalzen, abfiltriert und au ^gendeine geeignete Weise getrock- net. Er bildet ein rötlichgelbes Pulver, wel ches mit heissem Wasser eine gelbe Lösung gibt und sich in konzentrierter Schwefelsäure mit grünlichgelber Farbe löst.
Der neue Farb stoff erzeugt auf Wolle gelbe Töne, die bei Anwendung eines 2/o Ammonazetat ent haltenden Farbbades, intensivem Waschen, Walken und Licht in ausgezeichneter Weise widerstehen.
Process for the preparation of a new monoazo dye. The present invention relates to the preparation of a new monoazo dye which produces yellow, intensive washing, fulling and light withstanding tones on wool in an excellent manner.
According to the present process, the dye is obtained by coupling dianotized dodecyl m-aminobenzoate with 1- (4'-sulfophenyl) -3-methyl-5-pyrazolone.
Example: 30.5 parts by weight of dodecyl rn-aminobenzoate are dianotized as a suspension in 250 parts by weight of water and 26 parts by weight of 36% strength hydrochloric acid by adding 7 parts by weight of sodium nitrite.
The diazo suspension formed is added to a cooled, aqueous solution (5 ° C.) of 25.4 parts by weight 1- (4'.Sulfophenyl) .3-methyl-5-pyrazolone, which is kept alkaline against litmus during the addition by means of soda becomes. The coupling reaction proceeds quickly.
The new dye obtained in this way is salted out with 5% salt (weight for volume), filtered off and dried in a suitable manner. It forms a reddish-yellow powder, which gives a yellow solution with hot water and dissolves in concentrated sulfuric acid with a greenish-yellow color.
The new dye produces yellow tones on wool, which are extremely resistant to intensive washing, tumbling and light when a dye bath containing 2 / o ammonium acetate is used.
Claims (1)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB194955X | 1935-11-21 | ||
| CH191569T | 1936-11-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CH194955A true CH194955A (en) | 1937-12-31 |
Family
ID=25722148
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CH194955D CH194955A (en) | 1935-11-21 | 1936-11-05 | Process for the preparation of a new monoazo dye. |
Country Status (1)
| Country | Link |
|---|---|
| CH (1) | CH194955A (en) |
-
1936
- 1936-11-05 CH CH194955D patent/CH194955A/en unknown
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