CH217235A - Process for the preparation of a dye of the stilbene series. - Google Patents
Process for the preparation of a dye of the stilbene series.Info
- Publication number
- CH217235A CH217235A CH217235DA CH217235A CH 217235 A CH217235 A CH 217235A CH 217235D A CH217235D A CH 217235DA CH 217235 A CH217235 A CH 217235A
- Authority
- CH
- Switzerland
- Prior art keywords
- dye
- orange
- mole
- stilbene series
- 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
- C09B56/00—Azo dyes containing other chromophoric systems
- C09B56/04—Stilbene-azo dyes
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Optical Filters (AREA)
- Coloring (AREA)
Description
Verfahren zur Herstellung eines Farbstoffes der Stilbenreihe. Es wurde gefunden, daB ein neuer Farb stoff der Stilbenreihe hergestellt werden kann, wenn man den Farbstoff, der durch vorsichtige Reduktion von 4,4'-Dinitrostil- ben-2,2'-disulfonsäure unter Verknüpfung zweier Moleküle erhalten wird, mit 1 Mol 4-Amino-4'-oxy-1,1'-azobenzol-3'-carbonsäure kondensiert.
Der neue Farbstoff stellt in trockenem Zustande ein dunkelbraunes Pulver dar, das sich in konzentrierter Schwefelsäure mit rein blauer, in Wasser mit orangegelber Farbe löst und Baumwolle aus gläubersalzhaltigem Bade in orangen Tönen färbt, die beim Be handeln mit Kupfersalzen in ein echtes, ins besondere sehr gut waschechtes Rotorange übergehen.
Der dem Verfahren als Ausgangsstoff dienende Farbstoff ist als ein Gemisch der Produkte der Formeln
EMI0001.0010
und
EMI0001.0011
aufzufassen. Die Kondensation kann beispielsweise durch Erhitzen der Komponenten in alkali schem, vorzugsweise ätzalkalischem Medium, offen oder unter Druck, durchgeführt wer den.
<I>Beispiel:</I> 9 Teile des Farbstoffes, der erhalten wird, wenn man 45 Teile 4,4'-dinitrostilben- 2,2'-disulfonsaures Natrium mit 7 Teilen Traubenzucker und 60 Teilen 30%iger Na tronlauge, in etwa 400 Teilen Wasser gelöst, bei 70 bis 80 reduziert und den Farbstoff in bekannter Weise durch Neutralisieren und Zugabe von Natriumchlorid abscheidet, und 2,8 Teile des Natriumsalzes der 4-Amino-4'- oxy-1,1'-azobenzol-3'-carbonsäure werden in 100 Teilen heissem Wasser gelöst und nach Zugabe von 16 Teilen 30%iger Natronlauge etwa. 12 Stunden rückfliessend gekocht.
Man lässt erkalten und filtritert den ausgeschie denen Farbstoff ab; nötigenfalls wird er aus verdünnter Lauge umgelöst.
Process for the preparation of a dye of the stilbene series. It has been found that a new dye of the stilbene series can be produced if the dye, which is obtained by careful reduction of 4,4'-dinitrostilbene-2,2'-disulfonic acid by linking two molecules, is added with 1 mol 4-Amino-4'-oxy-1,1'-azobenzene-3'-carboxylic acid condensed.
When dry, the new dye is a dark brown powder that dissolves in concentrated sulfuric acid with a purely blue color, in water with an orange-yellow color and colors cotton from baths containing glory's salt in orange tones, which when treated with copper salts turn into a real, especially very pass over well-washed red-orange.
The dye used as starting material for the process is available as a mixture of the products of the formulas
EMI0001.0010
and
EMI0001.0011
understand. The condensation can be carried out, for example, by heating the components in an alkaline, preferably caustic, medium, openly or under pressure.
<I> Example: </I> 9 parts of the dye obtained when 45 parts of 4,4'-dinitrostilbene-2,2'-disulphonic acid sodium with 7 parts of grape sugar and 60 parts of 30% sodium hydroxide solution are added in about 400 parts of water dissolved, reduced at 70 to 80 and the dye separated in a known manner by neutralizing and adding sodium chloride, and 2.8 parts of the sodium salt of 4-amino-4'-oxy-1,1'-azobenzene-3 '-carboxylic acid are dissolved in 100 parts of hot water and after the addition of 16 parts of 30% sodium hydroxide solution about. Boiled under reflux for 12 hours.
It is allowed to cool and the precipitated dye is filtered off; if necessary, it is redissolved from diluted lye.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH217235T | 1941-10-15 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH217235A true CH217235A (en) | 1941-10-15 |
Family
ID=4450015
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH217235D CH217235A (en) | 1941-10-15 | 1939-08-08 | Process for the preparation of a dye of the stilbene series. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH217235A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2466245A (en) * | 1944-06-27 | 1949-04-05 | Geigy Ag J R | Azo-azoxy dyes |
-
1939
- 1939-08-08 CH CH217235D patent/CH217235A/en unknown
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2466245A (en) * | 1944-06-27 | 1949-04-05 | Geigy Ag J R | Azo-azoxy dyes |
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