CH274697A - Process for the preparation of a new monoazo dye. - Google Patents
Process for the preparation of a new monoazo dye.Info
- Publication number
- CH274697A CH274697A CH274697DA CH274697A CH 274697 A CH274697 A CH 274697A CH 274697D A CH274697D A CH 274697DA CH 274697 A CH274697 A CH 274697A
- Authority
- CH
- Switzerland
- Prior art keywords
- monoazo dye
- new
- oxybenzene
- preparation
- dye
- 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
- C09B45/00—Complex metal compounds of azo dyes
- C09B45/02—Preparation from dyes containing in o-position a hydroxy group and in o'-position hydroxy, alkoxy, carboxyl, amino or keto groups
- C09B45/14—Monoazo compounds
- C09B45/16—Monoazo compounds containing chromium
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Coloring (AREA)
Description
Verfahren zur Herstellung eines neuen Monoazofarbstoffes. Es wurde gefunden, dass man zu einem wertvollen Monoazofarbstoff gelangt, wenn man diazotierte 6-Nitro-2-amino-l-oxy-benzol- 4-sulfonsäure mit 2-Acetylamino-4-methoxy-l- oxybenzol vereinigt.
Der neue Farbstoff stellt ein schwarzes Pulver .dar, das sich in verdünnter Natrium-- carbonatlösung mit violetter, in konzentrierter Schwefelsäure mit grüner Farbe löst und Wolle aus essigsaurem Bade in blaugrauen Tönen färbt, die durch Nachchromieren in ein Braungrau von guten Echtheitseigenschaften übergehen.
Die Kupplung erfolgt beim vorliegenden Verfahren mit Vorteil in alkalischem Medium, gegebenenfalls unter Zusatz neutraler oder basischer Lösungsmittel, wie z. B. Äthanol, Pyridin usw.
Beispiel: 23,4 Teile 6-Nitro-2-amino-1- oxybenzol-4- sulfonsäure werden in 1000 Teilen Wasser und 5 Teilen 30prozentiger Salzsäure suspendiert und unter Aussenkühlung mit 25 Volumteilen 4n-Natritimnitritlösung bei 5 bis 10 diazo- tiert. Die Diazolösung bzw.
Suspension wird durch Eiszugabe auf 5 abgekühlt, mit Na- triumcarbonat neutralisiert und in eine auf 0" gekühlte Lösung aus 18,1 Teilen 1-Oxy-2- acetylamino-4-methoxybenzol, 100 Teilen Was ser, 4 Teilen Natritunhydros-yd und 20 Teilen Pyridin gegeben. Man rührt bei 0 bis 5 , bis die Diazoreaktion verschwunden ist. Dann wird der entstandene Farbstoff durch Hinzu fügen von Natriumehlorid abgeschieden, ab filtriert und getrocknet.
Process for the preparation of a new monoazo dye. It has been found that a valuable monoazo dye is obtained if diazotized 6-nitro-2-amino-1-oxy-benzene-4-sulfonic acid is combined with 2-acetylamino-4-methoxy-l-oxybenzene.
The new dye is a black powder that dissolves in a dilute sodium carbonate solution with a violet color and in concentrated sulfuric acid with a green color and dyes wool from an acetic acid bath in blue-gray tones that change to a brown-gray with good fastness properties when chromium-plating.
In the present process, the coupling is advantageously carried out in an alkaline medium, optionally with the addition of neutral or basic solvents, such as. B. ethanol, pyridine, etc.
Example: 23.4 parts of 6-nitro-2-amino-1-oxybenzene-4-sulfonic acid are suspended in 1000 parts of water and 5 parts of 30 percent hydrochloric acid and diazotized at 5 to 10 with 25 parts by volume of 4N sodium nitrite solution with external cooling. The diazo solution or
The suspension is cooled to 5 by adding ice, neutralized with sodium carbonate and poured into a solution, cooled to 0 ", of 18.1 parts of 1-oxy-2-acetylamino-4-methoxybenzene, 100 parts of water, 4 parts of sodium hydroxide and 20 Parts of pyridine are added, the mixture is stirred at 0 to 5 until the diazo reaction has disappeared, then the resulting dye is separated off by adding sodium chloride, filtered off and dried.
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH274697T | 1948-06-04 | ||
CH270542T | 1949-03-23 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH274697A true CH274697A (en) | 1951-04-15 |
Family
ID=25731218
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH274697D CH274697A (en) | 1948-06-04 | 1948-06-04 | Process for the preparation of a new monoazo dye. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH274697A (en) |
-
1948
- 1948-06-04 CH CH274697D patent/CH274697A/en unknown
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