CH119623A - Process for the preparation of an azo dye. - Google Patents
Process for the preparation of an azo dye.Info
- Publication number
- CH119623A CH119623A CH119623DA CH119623A CH 119623 A CH119623 A CH 119623A CH 119623D A CH119623D A CH 119623DA CH 119623 A CH119623 A CH 119623A
- Authority
- CH
- Switzerland
- Prior art keywords
- azo dye
- preparation
- dyes
- yellow
- dye
- Prior art date
Links
Landscapes
- Coloring (AREA)
Description
Verfahren zur Herstellung eines Azofarbstoifes. Im Hauptpatent ist ein Verfahren zur Herstellung eines Azofarbstoffes, der Fär bungen von gelber Nuance liefert, beschrie ben, bei dem p. p'-Diaminodiphenylharn- stoff sulfiert, darnach tetrazotiert und so dann mit 2 Mol. Salizylsäure gekuppelt wird.
Es wurde nun gefunden, dass man einen Farbstoff von praktisch den gleichen Ei genschaften erhält, wenn man p. p'-Di- :trninodiphenylharnstoff tetrazotiert, darauf mit 2 Mol. Salizylsäure kuppelt und das entstandene Produkt sulfiert. Der neue Farbstoff färbt tierische und pflanzliche Faser in gelben Tönen. Er lässt sich durch Erhitzen mit Chromsalzlösung in eine was serlösliche Chromverbindung überführen, die Substantiven Charakter hat und gelbe Fär bungen von hervorragender Eehtheit liefert.
<I>Beispiel:</I> 10 Teile des Disazofarbstoffes aus p. p'- Diaminoclipbenylharnstoff und 2 Mol. Sali- zylsä.itre werden bei gewöhnlicher Tempe- ratur in 100 Teilen 2-3 %iges Oleun: unter Rühren eingetragen und während mehrerer Stunden auf zirka ?5 erhitzt. Man giesst auf Eis, filtriert den ausgeschiedenen Farb stoff ab, wäscht mit Wasser, nimmt in Sodalösung auf, salzt aus und trocknet.
Process for the production of an azo dye. In the main patent, a process for the preparation of an azo dye which provides dyeings of yellow shade is described ben, in which p. p'-Diaminodiphenylurea sulfated, then tetrazotized and then coupled with 2 mol. Salicylic acid.
It has now been found that a dye of practically the same properties is obtained when p. p'-di-: trinodiphenylurea tetrazotized, then coupled with 2 mol. salicylic acid and sulfated the resulting product. The new dye dyes animal and vegetable fibers in yellow tones. By heating it with a chromium salt solution, it can be converted into a water-soluble chromium compound, which has noun character and provides yellow coloring with excellent integrity.
<I> Example: </I> 10 parts of the disazo dye from p. p'-Diaminoclipbenylurea and 2 moles of salicylic acid are added to 100 parts of 2-3% oxygen with stirring at normal temperature and heated to about 5 for several hours. It is poured onto ice, the precipitated dye is filtered off, washed with water, taken up in soda solution, salted out and dried.
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE119623X | 1925-02-04 | ||
CH117995T | 1925-06-04 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH119623A true CH119623A (en) | 1927-04-01 |
Family
ID=25708927
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH119623D CH119623A (en) | 1925-02-04 | 1925-06-04 | Process for the preparation of an azo dye. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH119623A (en) |
-
1925
- 1925-06-04 CH CH119623D patent/CH119623A/en unknown
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