AT56110B - Process for the preparation of disazo dyes. - Google Patents
Process for the preparation of disazo dyes.Info
- Publication number
- AT56110B AT56110B AT56110DA AT56110B AT 56110 B AT56110 B AT 56110B AT 56110D A AT56110D A AT 56110DA AT 56110 B AT56110 B AT 56110B
- Authority
- AT
- Austria
- Prior art keywords
- preparation
- dyes
- disazo dyes
- sulfonic acid
- phosgene
- Prior art date
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- Coloring (AREA)
Description
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Verfahren zur Darstellung von Disazofarbstoffen.
Durch das Stammpatent Nr. 56109 ist ein Verfahren zur Darstellung von Disazofarbstoffen geschützt, das darin besteht, dass man die Tetrazoverbindung der p. p'-Diamino- diphenylharnstoff-m. m'-disulfosäure des D. R. P. Nr. 140613 entweder in saurer oder neutraler Lösung mit einem Molekül 2. 8-Aminonaphtol-6-sulfosäure oder ihrer Alkylderivate und mit einem Molekül einer Monosulfosäure des ss-Naphtylamins oder seiner Alkylderivate oder mit zwei Molekülen der letztgenannten Komponenten vereinigt.
Es wurde nun gefunden, dass man diese Farbstoffe vorteilhaft auch in der Weise herstellen kann, dass man in den Monoazofarbstoffen, die man z. B. aus diazotierter p-Nitranilin-o-sulfosäure und den erwähnten Monosulfosäuren des ss-Naphtytamins oder seiner Alkylderivate erhält, die Nitrogruppe reduziert und dann die Aminoazofarbstoffe mit Phosgen behandelt. Man kann auch von der Azetyl-p-phenylendiaminsulfosäure ausgehen, den Monoazofarbstoff verseifen und mit Phosgen behandeln.
Beispiel.
480 Teile des Natriumsalzes der p-Amino-o-sulfobenzolazo-ss-methylnaphtylamin- - 7-sulfosäure werden bei etwa 40 in 30.000 Teilen Wasser gelöst und dann Phosgen eingeleitet, während man die Lösung schwach alkalisch hält, bis die Aminogruppe nicht mehr durch die Diazoreaktion nachweisbar ist. Der erforderlichenfalls durch Umlösen gereinigte Farbstoff ist identisch mit demjenigen des Beispieles 1 des Stammpatentes.
Das Verfahren verläuft in analoger Weise bei Verwendung anderer Azofarbstoffe aus p-Nitranilin-o-sulfosiiure und den betreffenden Naphtalinderivaten.
**WARNUNG** Ende DESC Feld kannt Anfang CLMS uberlappen**.
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Process for the preparation of disazo dyes.
A process for the preparation of disazo dyes is protected by the parent patent No. 56109, which consists in the fact that the tetrazo compound of p. p'-diamino-diphenylurea-m. m'-disulfonic acid of DRP No. 140613 either in acidic or neutral solution with one molecule of 2. 8-aminonaphthol-6-sulfonic acid or its alkyl derivatives and with one molecule of a monosulfonic acid of ss-naphthylamine or its alkyl derivatives or with two molecules of the latter components united.
It has now been found that these dyes can also advantageously be prepared in such a way that one can use the monoazo dyes that are z. B. obtained from diazotized p-nitroaniline-o-sulfonic acid and the mentioned monosulfonic acids of ss-naphtytamine or its alkyl derivatives, reduced the nitro group and then treated the aminoazo dyes with phosgene. You can also start from acetyl-p-phenylenediaminesulfonic acid, saponify the monoazo dye and treat it with phosgene.
Example.
480 parts of the sodium salt of p-amino-o-sulfobenzolazo-ss-methylnaphtylamine- 7-sulfonic acid are dissolved at about 40 in 30,000 parts of water and then phosgene is introduced while the solution is kept slightly alkaline until the amino group is no longer through the Diazo reaction is detectable. The dye, which has been purified by dissolving if necessary, is identical to that of Example 1 of the parent patent.
The process proceeds in an analogous manner when using other azo dyes made from p-nitroaniline-o-sulfonic acid and the relevant naphthalene derivatives.
** WARNING ** End of DESC field may overlap beginning of CLMS **.
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE56109X | 1910-08-08 | ||
DE56110X | 1910-12-01 |
Publications (1)
Publication Number | Publication Date |
---|---|
AT56110B true AT56110B (en) | 1912-11-11 |
Family
ID=25749237
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AT56110D AT56110B (en) | 1910-08-08 | 1911-10-12 | Process for the preparation of disazo dyes. |
Country Status (1)
Country | Link |
---|---|
AT (1) | AT56110B (en) |
-
1911
- 1911-10-12 AT AT56110D patent/AT56110B/en active
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