CH244515A - Process for the preparation of an azo dye. - Google Patents
Process for the preparation of an azo dye.Info
- Publication number
- CH244515A CH244515A CH244515DA CH244515A CH 244515 A CH244515 A CH 244515A CH 244515D A CH244515D A CH 244515DA CH 244515 A CH244515 A CH 244515A
- Authority
- CH
- Switzerland
- Prior art keywords
- azo dye
- pyrazolone
- preparation
- dye
- tetrazotized
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
- C09B35/00—Disazo and polyazo dyes of the type A<-D->B prepared by diazotising and coupling
- C09B35/02—Disazo dyes
- C09B35/039—Disazo dyes characterised by the tetrazo component
- C09B35/08—Disazo dyes characterised by the tetrazo component the tetrazo component being a derivative of biphenyl
- C09B35/20—Disazo dyes characterised by the tetrazo component the tetrazo component being a derivative of biphenyl from two coupling compounds of different types
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Coloring (AREA)
Description
Zusatzpatent zum Hauptpatent Nr. 242160. Verfahren zur Herstellung eines Azofarbstoffes. Es wurde gefunden, dass ein wertvoller Azo.farbstoff hergestellt werden kann, wenn man tetrazotiertes 3-Oxy-4,4'-diaminodiphe- nyl einerseits mit Salicylsäure und anderseits mit 3-Methyl-5-pyrazolon kuppelt.
Der neue Farbstoff stellt ein dunkles Pul ver dar, das sich in Wasser mit orangebrau- ner, in verdünnten Alkalien mit orangeroter und in konzentrierter Schwefelsäure mit rubinroter Farbe löst und pflanzliche Fasern nach dem einbadigen Nachkupferungsverfah- ren in wasch- und lichtechten Rottönen färbt.
Die Tetrazotierung des 3-0xybenzidins kann in bekannter Weise z. B. in salzsaurer Lösung vorgenommen werden. Die Kupplung der Tetrazoverbindung mit den beiden Azo- komponenten kann in alkalischem, z. B. Al kalihydroxyd oder -carbonat enthaltendem Medium durchgeführt werden und erfolgt zweckmässig in. zwei Stufen. Hierbei kann man vorteilhaft die Tetrazoverbindung in einer 1.
Stufe mit Salicylsäure und in einer ?. Stufe mit 3-Methyl-5-pyrazolon vereinigen. Beispiel: 5,0 Teile 3-Oxybenzidin werden in übli cher Weise in Gegenwart von Salzsäure mit Natriumnitrit tetrazotiert. Die Lösung der Tetrazaverbindung wird bei 5 mit einer Lö sung von 3,5 Teilen Salicylsäure und 6 Teilen Natriumhydroxyd in 40 Teilen Wasser ver einigt und das Gemisch während 1/2 Stunde bei 4-6 gerührt.
Nach dieser Zeit ist der Monoazofarbstoff gebildet. 1Vlan gibt nun zum Kupplungsgemisch eine Lösung von 2,45 Teilen 3-Methyl-5-pyrazolon und 2 Teilen Natriumhydroxyd in 50 Teilen Wasser. Man rührt das Gemisch während 1 Stunde bei 10-12 und 20 Stunden bei 15=20 . Durch Zusatz von Kochsalz wird der Farbstoff ab geschieden und getrocknet.
Additional patent to main patent No. 242160. Process for the production of an azo dye. It has been found that a valuable azo dye can be produced if tetrazotized 3-oxy-4,4'-diaminodiphenyl is coupled on the one hand with salicylic acid and on the other hand with 3-methyl-5-pyrazolone.
The new dye is a dark powder that dissolves in water with an orange-brown color, in dilute alkalis with orange-red and in concentrated sulfuric acid with a ruby-red color.
The tetrazotization of 3-0xybenzidins can be carried out in a known manner, for. B. be made in hydrochloric acid solution. The coupling of the tetrazo compound with the two azo components can be carried out in an alkaline, e.g. B. Al kalihydroxyd or carbonate-containing medium are carried out and is conveniently carried out in. Two stages. Here you can advantageously use the tetrazo compound in a 1.
Level with salicylic acid and in one?. Combine stage with 3-methyl-5-pyrazolone. Example: 5.0 parts of 3-oxybenzidine are tetrazotized in the usual manner in the presence of hydrochloric acid with sodium nitrite. The solution of the tetraza compound is combined at 5 with a solution of 3.5 parts of salicylic acid and 6 parts of sodium hydroxide in 40 parts of water and the mixture is stirred at 4-6 for 1/2 hour.
After this time the monoazo dye is formed. 1Vlan now adds a solution of 2.45 parts of 3-methyl-5-pyrazolone and 2 parts of sodium hydroxide in 50 parts of water to the coupling mixture. The mixture is stirred for 1 hour at 10-12 and 20 hours at 15 = 20. The dye is separated off and dried by adding sodium chloride.
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH244515T | 1942-09-03 | ||
CH242160T | 1946-04-30 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH244515A true CH244515A (en) | 1946-09-15 |
Family
ID=25728657
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH244515D CH244515A (en) | 1942-09-03 | 1942-09-03 | Process for the preparation of an azo dye. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH244515A (en) |
-
1942
- 1942-09-03 CH CH244515D patent/CH244515A/en unknown
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