CH205421A - Process for the preparation of a disazo dye. - Google Patents
Process for the preparation of a disazo dye.Info
- Publication number
- CH205421A CH205421A CH205421DA CH205421A CH 205421 A CH205421 A CH 205421A CH 205421D A CH205421D A CH 205421DA CH 205421 A CH205421 A CH 205421A
- Authority
- CH
- Switzerland
- Prior art keywords
- dye
- disazo dye
- preparation
- violet
- alkaline solution
- 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
- C09B35/02—Disazo dyes
- C09B35/039—Disazo dyes characterised by the tetrazo component
- C09B35/04—Disazo dyes characterised by the tetrazo component the tetrazo component being a benzene derivative
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Coloring (AREA)
Description
Zusatzpatent zum Hauptpatent Nr. 199787. Verfahren zur Darstellung eines Disazofarbstoifes. Es wurde gefunden, dass man einen neuen, wertvollen Disazofarbstoff der Formel
EMI0001.0003
erhält, wenn man den durch Kuppeln von dianotierter 4-Oxalylamino-l-aminobenzol-3- sulfonsäure mit Phenol in alkalischer Lösung erhältlichen Morioazofarbstoff verseift, diano tiert,
sauer mit 2-Amino-8-riaphthol-6-sulfon- säure vereinigt und den Disazofarbstoff in alkalischer Lösung mit p-Toluolsulfonsäure- ehlorid in der phenolischen Hydroxylgruppe verestert.
Der neue Farbstoff, ein dunkles Pulver, löst sich in Wasser violett, in konzentrierter Schwefelsäure blau und färbt Wolle und Seide in lichtechten violetten Tönen.
Beispiel: 26 Teile 4-Oxalylamino-l-aminobenzol-3- sulfonsäure werden dianotiert und mit 9,4 Teilen Phenol sodaalkalisch bei 0 C ge kuppelt. Der Monoazofarbstoff wird isoliert und mit 4prozentiger Natronlauge in der Hitze verseift, wiederum isoliert und nun mit 7 Teilen Nitrit und 30 Teilen Salzsäure dianotiert. Die Diazoniumverbindung wird darauf mit 24 Teilen 2-Amino-8-naphthol-6- sulfonsäure in saurer Lösung gekuppelt.
So bald die Bildung des Disazofarbstoffes been det ist, stellt man mit Soda oder Natronlauge alkalisch und verestert die phenolische Hy- droxylgruppe bei 75 mit 40 Teilen p-Toluol- sulfonsäurechlorid, salzt den Farbstoff aus, filtriert und trocknet ihn.
Er bildet ein dunkles Pulver, das sich in Wasser mit violetter, in konzentrierter Schwe felsäure mit blauer Farbe löst und Wolle und Seide in lichtechten violetten Tönen anfärbt.
Der neue Farbstoff ist identisch mit dem jenigen des Zusatzpatentes 203870.
Additional patent to main patent no. 199787. Process for the preparation of a disazo dye. It has been found that a new, valuable disazo dye of the formula
EMI0001.0003
obtained if the morioazo dye obtainable by coupling dianotated 4-oxalylamino-l-aminobenzene-3-sulfonic acid with phenol in an alkaline solution is saponified, diano tiert,
acidic combined with 2-amino-8-riaphthol-6-sulfonic acid and esterified the disazo dye in alkaline solution with p-toluenesulfonic acid chloride in the phenolic hydroxyl group.
The new dye, a dark powder, dissolves violet in water, blue in concentrated sulfuric acid and dyes wool and silk in lightfast violet tones.
Example: 26 parts of 4-oxalylamino-1-aminobenzene-3-sulfonic acid are dianotized and coupled with 9.4 parts of phenol in a soda-alkaline manner at 0 C. The monoazo dye is isolated and saponified with 4 percent sodium hydroxide solution in the heat, isolated again and then dianotized with 7 parts of nitrite and 30 parts of hydrochloric acid. The diazonium compound is then coupled with 24 parts of 2-amino-8-naphthol-6-sulfonic acid in acidic solution.
As soon as the formation of the disazo dye has ended, it is made alkaline with soda or sodium hydroxide solution and the phenolic hydroxyl group is esterified at 75 with 40 parts of p-toluenesulfonic acid chloride, the dye is salted out, filtered and dried.
It forms a dark powder that dissolves in water with a violet color and in concentrated sulfuric acid with a blue color and dyes wool and silk in lightfast violet tones.
The new dye is identical to that of the additional patent 203870.
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH205421T | 1937-05-19 | ||
CH199787T | 1938-07-19 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH205421A true CH205421A (en) | 1939-06-15 |
Family
ID=25723363
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH205421D CH205421A (en) | 1937-05-19 | 1937-05-19 | Process for the preparation of a disazo dye. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH205421A (en) |
-
1937
- 1937-05-19 CH CH205421D patent/CH205421A/en unknown
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