CH136253A - Process for the preparation of an o-oxyazo dye. - Google Patents
Process for the preparation of an o-oxyazo dye.Info
- Publication number
- CH136253A CH136253A CH136253DA CH136253A CH 136253 A CH136253 A CH 136253A CH 136253D A CH136253D A CH 136253DA CH 136253 A CH136253 A CH 136253A
- Authority
- CH
- Switzerland
- Prior art keywords
- dye
- preparation
- oxyazo
- carboxylic acid
- dioxynaphthalene
- Prior art date
Links
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
Verfahren zur Darstellung eines o-Oxyazofarbstoffes. Es wurde gefunden,, dass man neue o- Oxyazofarbstoffe erhält, die wertvolle, durch ihr Ega.lisierungsvermögen ausgezeichnete Beizenfarbstoffe von vorzüglichen Echtheits eigenschaften sind, wenn man o-Oxydiazo- verbindungen mit 2. 8 - Dioxynaphthalin - 6- carbonsäure., zweckmässig in alkalischer Lö sung, kuppelt.
Die bisher unbekannte 2 . 8 - Dioxynaph- thalin-6-carbonsäure erhält man durch Sul- fieren der 2 . 6 - Naphtholcarbonsäure und Alkalischmelze der so erhaltenen 2-Naphthol- 8-sulfo-6-carbonsäure.
Vorliegendes Patent bezieht sich nun auf die Darstellung eines o-Oxya.zofa.rbstof f es durch Kombination von dia.zotiertem 4-\Titro- 2-aminophenol mit 2.8-Dioxynaphthalin-6- carbonsäure.
Trocken ist der Farbstoff ein schwärz liches Pulver, löslich in konzentrierter Schwefelsäure mit bläulich roter Farbe: er färbt Wolle in sehr gleichmässigere braunen Tönen; durch Nachchromieren er hält man ein Oliv von vorzüglicher Echt heit.
Beispiel: Afan dia,zotiert 15,4 Teile 4-Nitra-2- a,minophenoi in der üblichen Weise und lässt die Diaaoverbindung in eine kalkalkalische Lösung von 21 Teilen. 2. 8-Dioxynaphthalin- 6-carbonsäure einfliessen. Nach beendeter Kupplung wird der Kalk durch Zugabe von Soda gefällt und durch Filtration entfernt.
Der Farbstoff wird aus. dem Filtrat durch Aussalzen gewonnen.
Process for the preparation of an o-oxyazo dye. It has been found that new o-oxyazo dyes are obtained which are valuable mordant dyes with excellent fastness properties, which are excellent due to their Ega.lisierungskraft, if o-oxydiazo compounds with 2.8 - dioxynaphthalene - 6-carboxylic acid., Expediently in alkaline solution, couples.
The previously unknown 2. 8 - Dioxynaphthalene-6-carboxylic acid is obtained by sulfating the 2. 6 - Naphthol carboxylic acid and alkali melt of the 2-naphthol-8-sulfo-6-carboxylic acid thus obtained.
The present patent now relates to the preparation of an o-oxy-zofa substance by combining dia.zotierter 4- \ titro-2-aminophenol with 2,8-dioxynaphthalene-6-carboxylic acid.
When dry, the dye is a blackish powder, soluble in concentrated sulfuric acid with a bluish red color: it dyes wool in very even brown tones; after chrome plating it one obtains an olive of excellent authenticity.
Example: Afan dia, quoting 15.4 parts of 4-Nitra-2- a, minophenoi in the usual way and leaving the Diaao compound in a calcareous solution of 21 parts. 2. Flow in 8-dioxynaphthalene-6-carboxylic acid. After the coupling has ended, the lime is precipitated by adding soda and removed by filtration.
The dye will be off. the filtrate obtained by salting out.
Claims (1)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE136253X | 1926-10-05 | ||
| CH130158T | 1927-09-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CH136253A true CH136253A (en) | 1929-10-31 |
Family
ID=25711380
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CH136253D CH136253A (en) | 1926-10-05 | 1927-09-29 | Process for the preparation of an o-oxyazo dye. |
Country Status (1)
| Country | Link |
|---|---|
| CH (1) | CH136253A (en) |
-
1927
- 1927-09-29 CH CH136253D patent/CH136253A/en unknown
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