CH193343A - Process for the preparation of an azo dye. - Google Patents
Process for the preparation of an azo dye.Info
- Publication number
- CH193343A CH193343A CH193343DA CH193343A CH 193343 A CH193343 A CH 193343A CH 193343D A CH193343D A CH 193343DA CH 193343 A CH193343 A CH 193343A
- Authority
- CH
- Switzerland
- Prior art keywords
- dye
- azo dye
- blue
- preparation
- formula
- 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
- C09B43/00—Preparation of azo dyes from other azo compounds
- C09B43/08—Preparation of azo dyes from other azo compounds by reduction
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Coloring (AREA)
Description
Verfahren zur Herstellung eines Azofarbstoffes. Es wurde gefunden, dass ein Polyazofarbstoff hergestellt werden kann, wenn man auf den Azofarbstoff,der Formel
EMI0001.0009
alkalische reduzierende Mittel bis zur Ver- kettung zweier Azofarbstoffmoleküle durch die bei der Reduktion der Nitrogruppen ent stehende Stiekstoffbrückeeinwirken lässt.
Der Farbstoff stellt in trockenem Zu- stande ein dunkles Pulver dar, das :sich in verdünnter Sodalösung, sowie in konzentrier- ter Schwefelsäure mit blauer Farbe löst und Baumwolle aus glaubersalzhaltigem Bade in blaugrauen Tönen färbt, die beim Nach kupfern in ein eehtes Grünblau übergehen.
Als reduzierende Mittel, die in alka lischem Medium (z. B. Natronlauge oder Kalilauge) verwendet werden, kommen bei- spielsweise Glukose, Schwefelalkalien oder Stannit in Betracht.
<I>Beispiel:</I> Man diazotiert 1,7 Teile 5-Nitro-29-amino- 1-ogybenzol und kuppelt auf übliche Weise mit 4,1 Teilen :des Imidazols der Formel
EMI0001.0048
Der abgeschiedene Farbstoff wird unter Zu satz von 11,8 Teilen 80 % iger Natronlauge in 80 Teilen Wasser bei 60 gelöst.
Hierauf gibt man 1, 6 Teile Traubenzucker als 10 % ige Lösung hinzu und rührt während etwa. einer Stunde bei 55 bis<B>60'.</B> Durch Zurückstellen mit Säure bis zur schwach alkalischen Reak tion und Beigabe von Kochsalz wird der Farbstoff abgeschieden; zwecks Reinigung kann er in verdünnter Soda gelöst und mit Kochsalz wieder ausgefällt werden.
Process for the preparation of an azo dye. It has been found that a polyazo dye can be made by referring to the azo dye of the formula
EMI0001.0009
allows alkaline reducing agents to act until two azo dye molecules are linked by the nitrogen bridge formed during the reduction of the nitro groups.
When dry, the dye is a dark powder which: dissolves in a dilute soda solution and in concentrated sulfuric acid with a blue color and colors cotton from a bath containing Glauber's salt in blue-gray tones, which turn into a deep green-blue when copper is applied.
Possible reducing agents which are used in an alkaline medium (for example sodium hydroxide or potassium hydroxide) are, for example, glucose, alkaline sulfur or stannite.
<I> Example: </I> 1.7 parts of 5-nitro-29-amino-1-ogybenzene are diazotized and coupled with 4.1 parts in the usual way: of the imidazole of the formula
EMI0001.0048
The deposited dye is dissolved in 80 parts of water at 60 with the addition of 11.8 parts of 80% strength sodium hydroxide solution.
Then add 1.6 parts of glucose as a 10% solution and stir for about. one hour at 55 to <B> 60 '. </B> By setting back with acid until the reaction is weakly alkaline and adding sodium chloride, the dye is deposited; For cleaning purposes, it can be dissolved in diluted soda and precipitated with table salt.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH193343T | 1936-06-17 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH193343A true CH193343A (en) | 1937-10-15 |
Family
ID=4438797
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH193343D CH193343A (en) | 1936-06-17 | 1936-06-17 | Process for the preparation of an azo dye. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH193343A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6727351B1 (en) | 1999-03-13 | 2004-04-27 | Basf Aktiengesellschaft | Azoxy dyes and their Cu complexes |
-
1936
- 1936-06-17 CH CH193343D patent/CH193343A/en unknown
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6727351B1 (en) | 1999-03-13 | 2004-04-27 | Basf Aktiengesellschaft | Azoxy dyes and their Cu complexes |
US6903197B2 (en) | 1999-03-13 | 2005-06-07 | Basf Aktiengesellschaft | Azoxy dyes and copper complexes thereof |
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