CH252293A - Process for the preparation of a polyazo dye. - Google Patents
Process for the preparation of a polyazo dye.Info
- Publication number
- CH252293A CH252293A CH252293DA CH252293A CH 252293 A CH252293 A CH 252293A CH 252293D A CH252293D A CH 252293DA CH 252293 A CH252293 A CH 252293A
- Authority
- CH
- Switzerland
- Prior art keywords
- mol
- acid
- dye
- polyazo dye
- preparation
- 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
Verfahren zur Herstellung eines Polyazofarbatoffes. Gegenstand vorliegenden Patentes ist ein Verfahren zur Herstellung eines P'olyazo- farbstoffess. Das Verfahren ist dadurch ge kennzeichnet, dass man die diazotierte Amino- azoverbindung 4 - Amino - diphenyl - 4'-azo-m- kresotinsäure in alkalischem Medium mit dem Disazofarbstoff vereinigt,
der erhältlich ist durch Kuppeln von 1 Mol tetrazotierter 1-Ogy-2,6-diamino-benzol-4-sulfonsäure mit einerseits 1 Mol 2 _-#.mino-naphthalin-3-car- bonsäure und anderseits mit 1 Mol Resorcin.
Der erhaltene neue Polyazofarbstoff stellt ein dunkles Pulver dar, das sich in Wasser mit brauner und in konzentrierter Schwefel säure mit violetter Farbe löst. Baumwolle und Fasern aus regenerierter Cellulose wer den in rotstichig braunen Tönen angefärbt. Durch Nachbehandlung mit Kupfersulfat werden sehr gute Nass- und Lichtechtheiten erhalten.
<I>Beispiel:</I> 20,4 Teile 1-Ogy-2,6-diamino-benzol-4-sul- fonsäure werden in salzsaurer Lösung mit 13,8 Teilen Natriumnitrit tetrazotiert, die überschüseige Mineralsäure mit Natriumace- tat abgestumpft und in Gegenwart von über schüssigem Natriumacetat mit einer neutra len Lösung von 20,1 Teilen 2-Amino-naph- thaIin-3-carbonsäure gekuppelt.
Nach kurzer Zeit ist die Bildung des Zwischenproduktes beendet. Man versetzt erst mit einer neutra- len Lösung von 11 Teilen Resorcin und dann allmählich mit 40 Teilen Soda in 250 Teilen Wasser.
Der mit Kochsalz isolierte und mit Sole resorcinfrei gewaschene Disazofarbstoff wird in sodaalkalischer Lösung mit dem Zwi- sehenprodukt aus 18,4 Teilen tetrazotiertem Benzidin und 15,2 Teilen 2-Ogy-4-methyl- benzol-l-carbonsäure vereinigt. Am andern Morgen wird der gebildete Polyazofarbstoff ausgesalzen, filtriert und getrocknet.
Process for the production of a polyazo carbate. 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-m-cresotinic acid is combined with the disazo dye in an alkaline medium,
which is obtainable by coupling 1 mol of tetrazotized 1-Ogy-2,6-diamino-benzene-4-sulfonic acid with 1 mol of 2-minonaphthalene-3-carboxylic acid on the one hand and 1 mol of resorcinol on the other.
The new polyazo dye obtained is a dark powder that dissolves in water with brown and in concentrated sulfuric acid with a purple color. Cotton and fibers made from regenerated cellulose are dyed in reddish brown tones. Post-treatment with copper sulphate gives very good wet and light fastness properties.
<I> Example: </I> 20.4 parts of 1-ogy-2,6-diamino-benzene-4-sulphonic acid are tetrazotized with 13.8 parts of sodium nitrite in a hydrochloric acid solution, and the excess mineral acid is truncated with sodium acetate and coupled in the presence of excess sodium acetate with a neutral solution of 20.1 parts of 2-amino-naphthaIin-3-carboxylic acid.
The formation of the intermediate product is complete after a short time. First a neutral solution of 11 parts of resorcinol is added and then gradually 40 parts of soda in 250 parts of water are added.
The disazo dye isolated with sodium chloride and washed resorcinol-free with brine is combined in a soda-alkaline solution with the intermediate product of 18.4 parts of tetrazotized benzidine and 15.2 parts of 2-Ogy-4-methylbenzene-1-carboxylic acid. The next morning the polyazo dye formed is salted out, filtered and dried.
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH252293T | 1945-11-09 | ||
CH246985T | 1945-11-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH252293A true CH252293A (en) | 1947-12-15 |
Family
ID=25729167
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH252293D CH252293A (en) | 1945-11-09 | 1945-11-09 | Process for the preparation of a polyazo dye. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH252293A (en) |
-
1945
- 1945-11-09 CH CH252293D patent/CH252293A/en unknown
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