CH252287A - Process for the preparation of a polyazo dye. - Google Patents
Process for the preparation of a polyazo dye.Info
- Publication number
- CH252287A CH252287A CH252287DA CH252287A CH 252287 A CH252287 A CH 252287A CH 252287D A CH252287D A CH 252287DA CH 252287 A CH252287 A CH 252287A
- Authority
- CH
- Switzerland
- Prior art keywords
- brown
- dye
- diamino
- benzene
- polyazo 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
- C09B35/00—Disazo and polyazo dyes of the type A<-D->B prepared by diazotising and coupling
- C09B35/38—Trisazo dyes ot the type
- C09B35/40—Trisazo dyes ot the type the component K being a dihydroxy or polyhydroxy compound
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Coloring (AREA)
Description
<B>Zusatzpatent</B> zum Hauptpatent Nr. 246985. Verfahren zur Herstellung eines Polyazofarbstoffes. Gegenstand vorliegenden Patentes ist ein Verfahren zur Herstellung eines Polyazo- farbstoffes. Das Verfahren ist dadurch ge h ennzeichnet, dass man die diazotierte Amino- azoverbindung 4-Amino-diphenyl-4'-azo-sali- cylsäure in alkalischem Medium mit dem Disazofarbstoff vereinigt,
der erhältlich ist durch Kuppeln von 1 Mol tetrazotierter 1- Oxy-2,6-diamino-benzol-4-carbonsäure einer seits mit 1 Mol 1,3-Diamino-benzol und an derseits mit 1 Mol Resorcin.
Der entstandene neue Polyazofarbstoff stellt ein dunkles Pulver dar, das, sich in Wasser mit brauner und in konzentrierter Schwefelsäure mit violetter Farbe löst. Er färbt Cellulosefasern in braunen Tönen, wel- cbe durch Nachbehandlung mit Kupfersulfat in ein Braun von ,sehr guter Nass- und Licht echtheit übergehen.
Beispiel: 16,8 Teile 1-Oxy-2,6-diaminobenzol-4-car- bonsäure werden in salzsaurer Lösung mit 13,8 Teilen Natriumnitrit tetrazotiert, die überschüssige Mineralsäure mit Natriumace- ta.t abgestumpft und bei Gegenwart von über schüssigem Natriumacetat mit einer neutra len Lösung von 10,8 Teilen 1,3-Diamino-ben- zol vereinigt. Das Zwischenprodukt ist sehr rasch gebildet.
Nach zweistündigem Rühren wird weitergekuppelt, indem man die Zwi- schenverbindung in eine Lösung von 11 Tei len Resorcin, 40 Teilen Soda und 600 Teilen Wasser langsam einfliessen lässt, wobei ',sich der Disazofarbstoff augenblicklich bildet.
Man rührt noch einige Stunden, salzt aus, filtriert und wäscht den Presskuchen mit Sole, bis kein Resorcin mehr nachweisbar ist. Dann wird in sodaalkalischem Medium mit dem Zwischenprodukt, erhalten aus 18,4 Tei len tetrazotiertem Benzidin und 13,8 Teilen Salicylsäure, weitergekuppelt. Nach mehr stündigem Rühren wird der Polyazofarbstoff mit Salz isoliert, filtriert und getrocknet.
<B> Additional patent </B> to main patent no. 246985. Process for the production of a polyazo dye. The present patent relates to a process for the production of a polyazo dye. The process is characterized in that the diazotized amino azo compound 4-amino-diphenyl-4'-azo-salicylic acid is combined with the disazo dye in an alkaline medium,
which can be obtained by coupling 1 mol of tetrazotized 1-oxy-2,6-diamino-benzene-4-carboxylic acid on the one hand with 1 mol of 1,3-diamino-benzene and on the other hand with 1 mol of resorcinol.
The resulting new polyazo dye is a dark powder that dissolves in water with a brown color and in concentrated sulfuric acid with a purple color. It dyes cellulose fibers in brown shades, which after treatment with copper sulfate turn into a brown with very good wet and light fastness.
Example: 16.8 parts of 1-oxy-2,6-diaminobenzene-4-carboxylic acid are tetrazotized in hydrochloric acid solution with 13.8 parts of sodium nitrite, the excess mineral acid is blunted with sodium acetate and in the presence of excess sodium acetate combined with a neutral solution of 10.8 parts of 1,3-diamino-benzene. The intermediate product is formed very quickly.
After two hours of stirring, the coupling is continued by slowly flowing the intermediate compound into a solution of 11 parts of resorcinol, 40 parts of soda and 600 parts of water, the disazo dye being formed immediately.
The mixture is stirred for a few hours, salted out, filtered and the press cake is washed with brine until no more resorcinol can be detected. Then, in a soda-alkaline medium, the intermediate product, obtained from 18.4 parts of tetrazotized benzidine and 13.8 parts of salicylic acid, is coupled further. After stirring for more hours, the polyazo dye is isolated with salt, filtered and dried.
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH252287T | 1945-11-09 | ||
CH246985T | 1945-11-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH252287A true CH252287A (en) | 1947-12-15 |
Family
ID=25729161
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH252287D CH252287A (en) | 1945-11-09 | 1945-11-09 | Process for the preparation of a polyazo dye. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH252287A (en) |
-
1945
- 1945-11-09 CH CH252287D patent/CH252287A/en unknown
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