CH194662A - Process for the preparation of a leather dye. - Google Patents
Process for the preparation of a leather dye.Info
- Publication number
- CH194662A CH194662A CH194662DA CH194662A CH 194662 A CH194662 A CH 194662A CH 194662D A CH194662D A CH 194662DA CH 194662 A CH194662 A CH 194662A
- Authority
- CH
- Switzerland
- Prior art keywords
- dye
- leather
- dianotated
- preparation
- nitro
- Prior art date
Links
Description
Verfahren zur Herstellung eines Lederfarbstoffes. Nach dem im Hauptpatent beschriebenen Verfahren erhält man einen Leder in echten Tönen anfärbenden Farbstoff, wenn man 1.2- Dioxybenzol mit einem Mol dianotierter 4' Nitro-4-amir)odipher)ylamirr-2'-sulfosäure und einem Mol dianotiertem 4-Nitro-l-aminoben- zol kuppelt.
Wie nun weiter gefunden wurde, erhält man einen Farbstoff von ähnlichen Eigen schaften, wenn man 4'-Nitro-4-aminodiphe- nylamin-2'-sulfosä))re dianotiert, die Diazo- verbindung mit 1. 2-Dioxy benzol kuppelt, den so erhaltenen Monoazofarbatoff mit einem schwach wirkenden Oxydationsmittel oxydiert und ihn schliesslich mit dianotiertem 4.6- Dirritro-2-amino-l-oxybenzol weiterkuppelt. <I>Beispiel:
</I> 30,9 Teile 4'-Nitro-4-aminodiphenylamin- 2'-sulfosäure werden in bekannter Weise di anotiert und mit einer Lösung von 11 Teilen 1 .2-Dioxybenzol in der Kälte vereinigt. Als dann bläst man unter Erwärmen mehrere Stunden lang durch die Farbstofflösung einen Luftstrom und gibt schliesslich die aus 19,9 Teilen 4.6-Dir)itro-2-amino-l-oxybenzol be reitete Diazoverbindung hinzu, wobei die Reaktionslösung immer alkalisch bleiben soll. Der Farbstoff färbt Chromleder und vegeta bilisch gegerbtes Leder in schönen Havanna tönen von guten Echtheitseigenschaften.
Process for the preparation of a leather dye. According to the process described in the main patent, a dye which dyes leather in real shades is obtained if 1,2-dioxybenzene is mixed with one mole of dianotated 4 'nitro-4-amir) odipher) ylamir-2'-sulfonic acid and one mole of dianotated 4-nitro-1 -aminoben- zol couples.
As has now been further found, a dye with similar properties is obtained if 4'-nitro-4-aminodiphenylamine-2'-sulfosä)) is redianotated, the diazo compound is coupled with 1,2-dioxybenzene, the monoazo carbate thus obtained is oxidized with a weakly acting oxidizing agent and finally coupled with dianotated 4,6-dirritro-2-amino-1-oxybenzene. <I> example:
</I> 30.9 parts of 4'-nitro-4-aminodiphenylamine-2'-sulfonic acid are anotized in a known manner and combined with a solution of 11 parts of 1,2-dioxybenzene in the cold. Then, while warming, a stream of air is blown through the dye solution for several hours and finally the diazo compound prepared from 19.9 parts of 4,6-dir) itro-2-amino-1-oxybenzene is added, the reaction solution should always remain alkaline. The dye dyes chrome leather and vegetable tanned leather in beautiful Havana tones with good fastness properties.
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE194662X | 1935-07-20 | ||
CH189871T | 1935-09-12 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH194662A true CH194662A (en) | 1937-12-15 |
Family
ID=25721893
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH194662D CH194662A (en) | 1935-07-20 | 1935-09-12 | Process for the preparation of a leather dye. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH194662A (en) |
-
1935
- 1935-09-12 CH CH194662D patent/CH194662A/en unknown
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