CH194660A - Process for the preparation of a leather dye. - Google Patents
Process for the preparation of a leather dye.Info
- Publication number
- CH194660A CH194660A CH194660DA CH194660A CH 194660 A CH194660 A CH 194660A CH 194660D A CH194660D A CH 194660DA CH 194660 A CH194660 A CH 194660A
- Authority
- CH
- Switzerland
- Prior art keywords
- dye
- leather
- nitro
- aminodiphenylamine
- preparation
- Prior art date
Links
Landscapes
- Coloring (AREA)
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'- Niti-o-4-amiriodiphenylamin-2'-sulfosäure und einem Mol dianotiertem 4-Nitro-l-amirioben- zol kuppelt.
Wie nun weiter gefunden wurde; erhält man einen Farbstoff von ähnlichen Eigen schaften, wenn man dianotierte 4'-Nitro-4- amiriodiphenylamin-2'-sulfosäure mit 1.2-Di- oxybenzol kuppelt, den erhaltenen Farbstoff mit einem schwach wirkenden Oxydations mittel behandelt und dann durch Zusatz eines weiteren Mols dianotierter 4'-Nitro-4-amino- dipheriylamin-2'-sulfosäure den Disazofarbstoff bildet.
<I>Beispiel:</I> 30,9 Teile 4'-Nitro-4-aminodiphenylamin- 2'-sulfosäure werden in der üblichen Weise dianotiert, die Diazolösung lässt man in eine kalte, sodaalkalisch gehaltene Lösung von 11 Teilen 1.2-Diogybenzol einlaufen. Die Kupp lung erfolgt augenblicklich.
Durch die Lösung des so erhaltenen Monoazofarbstoffes bläst man unter Erwärmen einige Stunden lang einen Luftstrom und gibt weiterhin die Diazo- verbindnng zu, die aus 30,9 Teilen 4'-Nitro- 4-aminodiphenylamin-2'-sulfosäure bereitet ist, wobei die Reaktionslösung immer alkalisch bleiben soll. Nach beendeter Kupplung wird der Farbstoff aasgesalzen, er färbt Chrom leder und vegetabilisch gegerbtes Leder in havannabraunen Tönen von guten Echtheits eigenschaften.
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'-Niti-o-4-amiriodiphenylamine-2'-sulfonic acid and one mole of dianotized 4-nitro-l amirioben- zol domes.
As has now been found further; a dye of similar properties is obtained if dianotated 4'-nitro-4-amiriodiphenylamine-2'-sulfonic acid is coupled with 1,2-dioxybenzene, the dye obtained is treated with a weak oxidizing agent and then by adding a further mol dianotized 4'-nitro-4-aminodipheriylamine-2'-sulfonic acid forms the disazo dye.
<I> Example: </I> 30.9 parts of 4'-nitro-4-aminodiphenylamine-2'-sulfonic acid are dianotized in the usual way, the diazo solution is left in a cold, soda-alkaline solution of 11 parts of 1,2-diogybenzene come in. The coupling is instantaneous.
A stream of air is blown through the solution of the monoazo dye thus obtained with heating for a few hours and the diazo compound, which is prepared from 30.9 parts of 4'-nitro-4-aminodiphenylamine-2'-sulfonic acid, is also added, the reaction solution should always remain alkaline. When the coupling is complete, the dye is carrion-salted, it dyes chrome leather and vegetable-tanned leather in havana brown shades with good fastness properties.
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE194660X | 1935-07-20 | ||
CH189871T | 1935-09-12 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH194660A true CH194660A (en) | 1937-12-15 |
Family
ID=25721891
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH194660D CH194660A (en) | 1935-07-20 | 1935-09-12 | Process for the preparation of a leather dye. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH194660A (en) |
-
1935
- 1935-09-12 CH CH194660D patent/CH194660A/en unknown
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