CH121973A - Process for the preparation of a developer dye. - Google Patents
Process for the preparation of a developer dye.Info
- Publication number
- CH121973A CH121973A CH121973DA CH121973A CH 121973 A CH121973 A CH 121973A CH 121973D A CH121973D A CH 121973DA CH 121973 A CH121973 A CH 121973A
- Authority
- CH
- Switzerland
- Prior art keywords
- brown
- amino
- preparation
- dye
- naphthol
- 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 3'-Amino-4'-methyl-5'-sulfo-l-phe- nyl-5-pyrazolon-3-karbonsäure zu einem Zwi schenprodukt vereinigt und dasselbe in alka lischer Lösung mit 2-Amino-8-naphtol-6-sulfo- säure weiterkuppelt.
Der neue Farbstoff bildet ein braun schwarzes Pulver, das sich in Wasser mit violettbrauner, in konzentrierter Schwefelsäure mit blauer Farbe löst. Er färbt urgebeizte Baumwolle in violettbraunen Tönen, welche sich durch Diazotieren auf der Faser und nachfolgende Entwicklung mit P-Naphtol zu waschechtem Schokoladebraun fixieren lassen.
<I>Beispiel:</I> Zu der Tetrazolösung aus 21,2 Teilen o-Tolidin lässt man bei.0-5 C die neutral gestellte Lösung des Trinatriumsalzes von 31,3 Teilen 3'-Amino-4'-methyl-5'-sulfo-l-phe- nyl-5-pyrazolon-3-karbonsäure zufliessen. So bald unveränderte Tetrazoverbindung nicht mehr nachweisbar ist, gibt man die Lösung von 20 Teilen kalzinierter Soda und hierauf die schwach phenolphtaleinalkalische Lösung von 23,9 Teilen 2-Amino-8-naphtol-6-sulfo- säure zu.
Die Kombination ist nach wenigen Stunden beendigt. Es wird alsdann aufge kocht und der Farbstoff ausgesalzen.
Process for the preparation of a developer dye. It has been found that a valuable developer dye is obtained if tetrazotized o-tolidine is used in a molecular ratio with 3'-amino-4'-methyl-5'-sulfo-1-phenyl-5-pyrazolone-3-carboxylic acid combined to form an intermediate product and coupled further in alkaline solution with 2-amino-8-naphthol-6-sulfonic acid.
The new dye forms a brown-black powder that dissolves in water with a purple-brown color, and in concentrated sulfuric acid with a blue color. It dyes primed cotton in violet-brown shades, which can be fixed to washable chocolate brown by diazotizing the fiber and then developing it with P-naphthol.
<I> Example: </I> The neutral solution of the trisodium salt of 31.3 parts of 3'-amino-4'-methyl-5 is added to the tetrazo solution of 21.2 parts of o-tolidine at 0-5 C '-sulfo-1-phenyl-5-pyrazolone-3-carboxylic acid flow in. As soon as unchanged tetrazo compound is no longer detectable, the solution of 20 parts of calcined soda and then the weakly phenolphthalein-alkaline solution of 23.9 parts of 2-amino-8-naphthol-6-sulfonic acid are added.
The combination ends after a few hours. It is then boiled and the dye is salted out.
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH119229T | 1925-10-17 | ||
GB121973X | 1926-02-19 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH121973A true CH121973A (en) | 1927-08-01 |
Family
ID=25709204
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH121973D CH121973A (en) | 1925-10-17 | 1926-05-25 | Process for the preparation of a developer dye. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH121973A (en) |
-
1926
- 1926-05-25 CH CH121973D patent/CH121973A/en unknown
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