CH194950A - Process for the preparation of a new monoazo dye. - Google Patents
Process for the preparation of a new monoazo dye.Info
- Publication number
- CH194950A CH194950A CH194950DA CH194950A CH 194950 A CH194950 A CH 194950A CH 194950D A CH194950D A CH 194950DA CH 194950 A CH194950 A CH 194950A
- Authority
- CH
- Switzerland
- Prior art keywords
- yellow
- preparation
- dye
- new
- monoazo dye
- Prior art date
Links
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- Coloring (AREA)
Description
Verfahren zur Herstellung eines neuen 1Vlonoazofarbstoffes. Vorliegende Erfindung betrifft die Her stellung eines neuen Monoazofarbstoffes, wel cher auf Wolle gelbe Töne von sehr guter Widerstandsfähigkeit gegen starke Beanspru chung durch Waschen, Walken und Licht erzeugt.
Gemäss vorliegendem Verfahren wird der Farbstoff hergestellt durch Kuppeln von diazo- tiertem Dodecyl-p-amino-benzoat mit 1-(4'- Sulfophenyl)-3-methyl-5-pyrazolon. <I>Beispiel:
</I> 30,5 Gewichtsteile Dodecyl-p-aminobenzoat (Smp.77-780 C), suspendiert in<B>250</B> Gewichts teilen Wasser und 26 Gewichtsteilen 360joiger Salzsäure, werden durch Zusetzen von 7 Ge wichtsteilen Natriumnitrit diazotiert. Die so erhaltene Diazosuspension fügt man zu einer eiskalten, wässerigen Lösung von 25,4 Ge wichtsteilen 1-(4'-Sulfophenyl)-3-methyl-5- pyrazolon, welche während des Zusetzens mit Soda alkalisch gehalten wird.
Nachdem die Kupplung vollendet ist, erhitzt man das Gemisch auf<B>500</B> C, salzt mit 20'/o Koch salz (Gewicht für Volumen) aus; kühlt auf 16-200 C ab und filtriert den Farbstoff ab. Nach Auswaschen mit 15 o/oigem Salzwasser wird der Farbstoffteig entweder als solcher aufbewahrt, oder getrocknet. In trockenem Zustande bildet der neue Far'astoff ein gelbes Pulver, welches sich in heissem, etwas Soda enthaltendem Wasser mit gelber Farbe löst und mit konzentrierter Schwefelsäure eine grünlichgelbe Lösung gibt.
Er färbt Wolle aus 2% Ammonazetat entha tendem Bade in gelben Tönen, welche starkem Waschen und Walken, sowie dem Licht sehr gut widerstehen.
Process for the preparation of a new 1-vlonoazo dye. The present invention relates to the Her position of a new monoazo dye, wel cher on wool yellow shades of very good resistance to severe stress generated by washing, fulling and light.
According to the present process, the dye is prepared by coupling diazotized dodecyl-p-amino-benzoate with 1- (4'-sulfophenyl) -3-methyl-5-pyrazolone. <I> example:
30.5 parts by weight of dodecyl p-aminobenzoate (melting point 77-780 C), suspended in 250 parts by weight of water and 26 parts by weight of 360 ° hydrochloric acid, are diazotized by adding 7 parts by weight of sodium nitrite . The diazo suspension thus obtained is added to an ice-cold, aqueous solution of 25.4 parts by weight of 1- (4'-sulfophenyl) -3-methyl-5-pyrazolone, which is kept alkaline with soda during the addition.
After the coupling is complete, the mixture is heated to <B> 500 </B> C, salted out with 20% sodium chloride (weight for volume); cools down to 16-200 C and filters off the dye. After washing with 15% salt water, the dyestuff is either stored as such or dried. When dry, the new dye forms a yellow powder, which dissolves in hot water containing a little soda with a yellow color and gives a greenish-yellow solution with concentrated sulfuric acid.
It dyes wool from baths containing 2% ammonium acetate in yellow tones, which withstand heavy washing and fulling, as well as light, very well.
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB194950X | 1935-11-21 | ||
CH191569T | 1936-11-05 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH194950A true CH194950A (en) | 1937-12-31 |
Family
ID=25722143
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH194950D CH194950A (en) | 1935-11-21 | 1936-11-05 | Process for the preparation of a new monoazo dye. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH194950A (en) |
-
1936
- 1936-11-05 CH CH194950D patent/CH194950A/en unknown
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