CH172610A - Process for the preparation of an azo dye. - Google Patents
Process for the preparation of an azo dye.Info
- Publication number
- CH172610A CH172610A CH172610DA CH172610A CH 172610 A CH172610 A CH 172610A CH 172610D A CH172610D A CH 172610DA CH 172610 A CH172610 A CH 172610A
- Authority
- CH
- Switzerland
- Prior art keywords
- dye
- azo dye
- preparation
- coupled
- nitro
- Prior art date
Links
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- Coloring (AREA)
Description
Verfahren zur Herstellung eines Azofarbstoffes. Gemäss dem im Hauptpatent beschriebe nen Verfahren erhält man einen wertvollen Azofarbstoff, wenn man 1 Mol dianotierter 1-Arnino-8-oxynaplitlialiri-3. 6-disulfosäure mit 1 Mol 1.3-Dioxybenzol kuppelt und man auf den so erhaltenen Morioazofarbstoff 2 Mol dianotiertes 2-Nitro-1.4-diainiriobenzol setzt.
Wie nun weiter gefunden wurde, erhält man einen Leder in etwas rötlicheren Tönen färbenden Farbstoff, wenn man den zunächst erhaltenen Monoazofarbstoff mit 1 Mol diazo- tiertein 2-Nitro-1..4-dianiiriobenzol weiter kuppelt.
Beispiel: 48,4 Teile des Farbstoffes aus dianotier ter 1-Aniirio-8-oxynaphthalin-3.6-disulfosäui-e und 1.3-Dioxyberizol werden in 1000 Teilen Wasser und 47 Teilen 30 ,1uiger Natronlauge gelöst. 19 Teile salzsaures 2-Nitro-1.4-di- aminobenzol werden in der üblichen Weise dianotiert.
Die Lösung der Diazoverbindung läuft bei<B>15"</B> zu der des Monoazofarbstoffes gleichzeitig mit 1000 Teilen 14 /oigei@ Natron- lauge. Nach mehreren Stunden wird der Farb- stoff ausgesalzen und abgesaugt. Nach dem Trocknen ist er ein dunkles Pulver, löslich in Wasser mit rotbrauner, in konzentrierter Schwefelsäure mit graugrüner Farbe. Der Farbstoff färbt das Leder etwas rotstickiger als der im Hauptpatent beschriebene.
Process for the preparation of an azo dye. According to the process described in the main patent, a valuable azo dye is obtained if 1 mole of dianotated 1-amino-8-oxynaplitlialiri-3. 6-disulfonic acid is coupled with 1 mole of 1,3-dioxybenzene and 2 moles of dianotated 2-nitro-1,4-diainiriobenzene are added to the morioazo dye thus obtained.
As has now also been found, a dye which dyes leather in somewhat more reddish shades is obtained if the monoazo dye initially obtained is further coupled with 1 mol of diazo-tiertein 2-nitro-1..4-dianiiriobenzene.
Example: 48.4 parts of the dye from dianotier ter 1-anion-8-oxynaphthalene-3,6-disulfosäui-e and 1,3-dioxyberizole are dissolved in 1000 parts of water and 47 parts of 30% sodium hydroxide solution. 19 parts of 2-nitro-1,4-diminobenzene hydrochloric acid are dianotized in the usual way.
The solution of the diazo compound runs at <B> 15 "</B> to that of the monoazo dye at the same time with 1000 parts of 14% sodium hydroxide solution. After several hours, the dye is salted out and suctioned off. After drying, it is a dark one Powder, soluble in water with red-brown color, in concentrated sulfuric acid with a gray-green color.
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE172610X | 1932-07-07 | ||
CH170089T | 1934-04-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH172610A true CH172610A (en) | 1934-10-15 |
Family
ID=25718850
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH172610D CH172610A (en) | 1932-07-07 | 1933-04-27 | Process for the preparation of an azo dye. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH172610A (en) |
-
1933
- 1933-04-27 CH CH172610D patent/CH172610A/en unknown
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