CH121017A - Process for the preparation of a developer dye. - Google Patents
Process for the preparation of a developer dye.Info
- Publication number
- CH121017A CH121017A CH121017DA CH121017A CH 121017 A CH121017 A CH 121017A CH 121017D A CH121017D A CH 121017DA CH 121017 A CH121017 A CH 121017A
- Authority
- CH
- Switzerland
- Prior art keywords
- brown
- dye
- red
- preparation
- nitro
- Prior art date
Links
Landscapes
- Coloring (AREA)
Description
Verfahren zur Darstellung eines Entwicklerfarbstoffes. Es wurde gefunden, dass ein wertvoller Entwicklerfarbstoff erhalten wird, wenn man tetrazotiertes o-Tolidin in molekularem Ver hältnis mit 2'-Methyl-3'-nitro-5'-sulfo-1-phenyl- 5-pyrazolon-3-karbonsäure zu einem Zwischen produkt vereinigt, dasselbe mit a-Naphtyl- aminsulfosäure-1,
6-Cleve weiterkuppelt und in dem so gebildeten Disazofarbstoff die Nitro- gruppe mit Schwefelnatron zur Aminogruppe reduziert. Der neue Farbstoff bildet ein braun schwarzes Pulver, das sich in Wasser mit rotbrauner, in konzentrierter Schwefelsäure mit blauvioletter Farbe löst. Er färbt unge- beizte Baumwolle in. rotbraunen Tönen, welche sich durch Diazotieren auf der Faser und nachfolgende Entwicklung mit Betanaph- tol zu waschechtem Schokoladebraun fixieren lassen.
<I>Beispiel:</I> Zu der Terazoditolyllösung aus 21,2 Teilen o-Tolidin lässt man bei 0-5 C die Lösung des Trinatriumsalzes von 34,3 Teilen 2'-Methyl- 3'- nitro -5'- s ulfo -1-ph enyl - 5 -pyrazolon-3-kar- Bonsäure zufliessen. Nach vollständiger Bil dung des Zwischenproduktes gibt man die Lösung von 24,5 Teilen a-Naphtylaminsulfo- saurem Natron-1,6-Cleve zu.
Die Kombination ist nach wenigen Stunden beendigt. Man neutralisiert durch Zugabe von 18 Teilen kalzinierter Soda, gibt die Lösung von 60 Teilen kristallisiertem Schwefelnatron zu und hält die braunrote Lösung solange bei 50 C, bis sich kein unverändertes Schwefelnatron mehr nachweisen lässt, was 12-15 Stunden dauert. Alsdann wird mit Salzsäure neutrali siert und der Farbstoff ausgewaschen.
Process for the preparation of a developer dye. It has been found that a valuable developer dye is obtained if tetrazotized o-tolidine in a molecular ratio with 2'-methyl-3'-nitro-5'-sulfo-1-phenyl-5-pyrazolone-3-carboxylic acid to one Combined between product, the same with a-naphthyl aminesulfonic acid-1,
6-Cleve further coupled and in the disazo dye thus formed, the nitro group is reduced to the amino group with sodium sulphide. The new dye forms a brown-black powder that dissolves in water with a red-brown color, and in concentrated sulfuric acid with a blue-violet color. It dyes unplaced cotton in red-brown shades, which can be fixed to washable chocolate brown by diazotizing the fiber and then developing it with betanaphthol.
<I> Example: </I> The solution of the trisodium salt of 34.3 parts of 2'-methyl-3'-nitro -5'- s is added to the terazoditolyl solution of 21.2 parts of o-tolidine at 0-5 ° C ulfo -1-ph enyl - 5 -pyrazolon-3-carboxylic acid. When the intermediate product is completely formed, the solution of 24.5 parts of α-naphthylaminesulfonic acid sodium 1,6-Cleve is added.
The combination ends after a few hours. The mixture is neutralized by adding 18 parts of calcined soda, the solution of 60 parts of crystallized sodium sulfate is added and the brown-red solution is kept at 50 ° C. until unchanged sodium sulfate can no longer be detected, which takes 12-15 hours. It is then neutralized with hydrochloric acid and the dye is washed out.
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE121017X | 1925-03-28 | ||
CH119229T | 1925-10-17 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH121017A true CH121017A (en) | 1927-07-01 |
Family
ID=25709201
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH121017D CH121017A (en) | 1925-03-28 | 1925-11-02 | Process for the preparation of a developer dye. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH121017A (en) |
-
1925
- 1925-11-02 CH CH121017D patent/CH121017A/en unknown
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