AT53454B - Process for the preparation of post-chromable ortho-oxyazo dyes. - Google Patents
Process for the preparation of post-chromable ortho-oxyazo dyes.Info
- Publication number
- AT53454B AT53454B AT53454DA AT53454B AT 53454 B AT53454 B AT 53454B AT 53454D A AT53454D A AT 53454DA AT 53454 B AT53454 B AT 53454B
- Authority
- AT
- Austria
- Prior art keywords
- ortho
- dyes
- chromable
- post
- preparation
- Prior art date
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Description
<Desc/Clms Page number 1>
Verfahren zur Darstellung nachchromierbarer Ortho-Oxyazofarbstoffe.
Durch Kombination der Nitro-1.2. 4-diazooxynaphtalinsulfosäure mit Naphtolen, deren Sulfosäuren und Karbonsäuren, Aminonaphtolen und Sulfosäuren derseiben, -Amidophenolen und m-Diaminen erhält man beizenziehende Ortho-Oxyazofarbstoffe.
Bei Behandlung dieser Kombinationen mit Schwefelnatrium oder Polysulfide in alkalischer Lösung hat sich nun gezeigt, dass dieselben durch Reduktion der Nitrogruppe in neue wertvolle Farbstoffe übergeführt werden können. Dieses Resultat war in keiner Weise vorauszusehen, da Erfahrungen über das Verhalten der Nitrogruppe in dieser Reihe von Farbstoffen bisher noch nicht vorliegen und das Gelingen der Reduktion ohne Zerstörung des Farbstoffes nicht a priori vorauszusehen war ; noch weniger war vorauszusehen, dass die daraus entstandenen Farbstoffe überhaupt einen Wert besitzen und eine gewerbliche Anwendung zulassen werden.
Beispiel :
Der durch Kombination von 144 Teilen a-Naphtol mit 300 Teilen Nitro-1. 2.4-diazo- naphtolsulfosäure erhältliche Azofarbstoff wird in der zirka zehnfachen Menge Wasser gelöst, 133 Teile Natronlauge (400 Be) hinzugefügt und bei gewöhnlicher Temperatur mit einer Lösung von 400 Teilen Schwefelnatrium versetzt.
Nach zirka zwölf Stunden Einwirkung wird der gebildete Farbstoff durch Ansäuern oder Aussalzen auf gewohnte Weise isoliert.
Bei Temperaturen von 35 bis 400 erfolgt die Reduktion momentan ; bei 10 bis 150 erfordert sie immerhin einige Stunden. An Stelle von Schwefelnatrium kann die entsprechende Menge Polysulfide bei sonst gleicher Arbeitsweise verwendet werden.
In gleicher wise wurden folgende Azokomhinationen reduziert : Nitrodiazokörpor + b-Naphtol färbt Wolle nach dem Chromieren bläulich-schwarz, Nitrodiazokörper + m-Toluylendiamin färbt Wo1le nach dem Chromieren braun.
**WARNUNG** Ende DESC Feld kannt Anfang CLMS uberlappen**.
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Process for the preparation of post-chromable ortho-oxyazo dyes.
By combining the Nitro 1.2. 4-diazooxynaphthalene sulfonic acid with naphthols, their sulfonic acids and carboxylic acids, aminonaphthols and sulfonic acids of the same, amidophenols and m-diamines are obtained as ortho-oxyazo dyes.
When these combinations are treated with sodium sulphide or polysulphides in an alkaline solution, it has now been shown that they can be converted into valuable new dyes by reducing the nitro group. This result could not be foreseen in any way, since experience on the behavior of the nitro group in this series of dyes is not yet available and the success of the reduction without destruction of the dye could not be foreseen a priori; It was even less likely that the resulting dyes would have any value at all and would allow commercial use.
Example:
The combination of 144 parts of a-Naphtol with 300 parts of Nitro-1. 2.4-diazonaphthol sulfonic acid is dissolved in about ten times the amount of water, 133 parts of sodium hydroxide solution (400 Be) are added and a solution of 400 parts of sodium sulphide is added at normal temperature.
After about twelve hours of exposure, the dye formed is isolated in the usual way by acidification or salting out.
At temperatures from 35 to 400 the reduction takes place momentarily; at 10 to 150 it takes a few hours. Instead of sodium sulphide, the corresponding amount of polysulphide can be used with otherwise the same procedure.
The following azo combinations were reduced in the same way: Nitrodiazocorpor + b-naphthol dyes wool bluish-black after chroming, nitrodiazo bodies + m-toluylenediamine dyes wool brown after chromating.
** WARNING ** End of DESC field may overlap beginning of CLMS **.
Claims (1)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT53454T | 1910-07-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AT53454B true AT53454B (en) | 1912-05-10 |
Family
ID=3574763
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AT53454D AT53454B (en) | 1910-07-17 | 1910-07-17 | Process for the preparation of post-chromable ortho-oxyazo dyes. |
Country Status (1)
| Country | Link |
|---|---|
| AT (1) | AT53454B (en) |
-
1910
- 1910-07-17 AT AT53454D patent/AT53454B/en active
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