CH235451A - Process for the preparation of a trisazo dye. - Google Patents
Process for the preparation of a trisazo dye.Info
- Publication number
- CH235451A CH235451A CH235451DA CH235451A CH 235451 A CH235451 A CH 235451A CH 235451D A CH235451D A CH 235451DA CH 235451 A CH235451 A CH 235451A
- Authority
- CH
- Switzerland
- Prior art keywords
- combined
- dye
- amino
- preparation
- sulfonic acid
- 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
- C09B31/00—Disazo and polyazo dyes of the type A->B->C, A->B->C->D, or the like, prepared by diazotising and coupling
- C09B31/16—Trisazo dyes
- C09B31/20—Trisazo dyes from a coupling component"D" containing a directive hydroxyl group
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
Verfahren zur Herstellung eines Trisazofarbstoffes. Vorliegendes Patent bezieht sich auf ein Verfahren zur Herstellung eines Trisazo- farbstoffes., -dadurch gekennzeichnet, dass man 1-Diazo-4-oxybenzol-3-,carbonsäure in saurem Medium mit 1-Amino-naphthalin-7-sulfon- säure vereinigt,,
den so erhaltenen Aminoazo- farbstoff diazotiert, die Diazoverbindung in saurem Medium mit 1-Amino-2.5-.dimethoxy- benzol vereinigt,
wieder Jiazotiert und die Diazoverbindun.g des so erhaltenen Amino- disazofarbstoffes in. alkalischem Medium mit 2-Nap.hthol-6-sulfonsäure vereinigt.
Der so erhaltene Trisazufarbstoff ist ein dunkles Pulver, ,das sich in Wasser mit dunkelvioletter, in Schwefelsäure mit dunkel- grüner Farbe -löst, und färbt Baumwolle in grünstickig .graublauen, lichtechten Tönen.
Die Fäxbungen werden idurch Nachbehandeln mit Chromi- oder Kupfersalzen etwas röter und sehr waschecht.
<I>Beispiel:</I> Die aus 15,3 Teilen 1-Amino-4-oxybenzol- 3-carbonsäure hergestellte Diazoverbindung wird in Gegenwart von überschüssigem Na- triumacetat mit einer Lösung des Natrium- sialzes von 22,
3 Teilen 1-Amino-naphthalin- 7 - sulfonsäure vereinigt. Nach beendeter Kupplung wird ,der Farbstoff weiterdiazotiert und die Diazoverbindung in essigsaurer Lö sung mit 15 Teilen 1-Amino-2.5-@dimethoxy- @benzol vereinigt. Der Farbstoff wind abge schieden und :
durch Anrühren mit Eis und Salzsäure und Zugabe einer Lösung von Na- triumnitrit weiterdiazotiert.
Die Diazosuspension vereinigt man bei 0-5 mit einer isadaalka.lis:chen Lösung von 22,4 Teilen 2-Naphthol-6-sulfonsäure, wobei ein Zusatz von Pyridin vorteilhaft ist.
Process for the preparation of a trisazo dye. The present patent relates to a process for the preparation of a trisazo dye., Characterized in that 1-diazo-4-oxybenzene-3-carboxylic acid is combined with 1-amino-naphthalene-7-sulfonic acid in an acidic medium, ,
the aminoazo dye thus obtained is diazotized, the diazo compound is combined with 1-amino-2,5-dimethoxybenzene in an acidic medium,
Jiazotized again and the diazo compound of the amino disazo dye thus obtained is combined with 2-napthol-6-sulfonic acid in an alkaline medium.
The trisazu dye obtained in this way is a dark powder, which dissolves in water with a dark purple color, in sulfuric acid with a dark green color, and dyes cotton in greenish-gray-blue, lightfast shades.
The stains become a little redder and very washable after treatment with chromium or copper salts.
<I> Example: </I> The diazo compound produced from 15.3 parts of 1-amino-4-oxybenzene-3-carboxylic acid is mixed with a solution of the sodium salt of 22 in the presence of excess sodium acetate.
3 parts of 1-amino-naphthalene- 7 - sulfonic acid combined. After the coupling is complete, the dye is further diazotized and the diazo compound is combined in acetic acid solution with 15 parts of 1-Amino-2.5-@dimethoxy- @benzene. The dye is separated and:
further diazotized by stirring with ice and hydrochloric acid and adding a solution of sodium nitrite.
The diazo suspension is combined at 0-5 with an isadaalka.lis: chen solution of 22.4 parts of 2-naphthol-6-sulfonic acid, the addition of pyridine being advantageous.
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE235451X | 1942-06-02 | ||
CH231710T | 1943-05-14 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH235451A true CH235451A (en) | 1944-11-30 |
Family
ID=25727622
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH235451D CH235451A (en) | 1942-06-02 | 1943-05-14 | Process for the preparation of a trisazo dye. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH235451A (en) |
-
1943
- 1943-05-14 CH CH235451D patent/CH235451A/en unknown
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