CH121014A - Process for the preparation of a developer dye. - Google Patents
Process for the preparation of a developer dye.Info
- Publication number
- CH121014A CH121014A CH121014DA CH121014A CH 121014 A CH121014 A CH 121014A CH 121014D A CH121014D A CH 121014DA CH 121014 A CH121014 A CH 121014A
- Authority
- CH
- Switzerland
- Prior art keywords
- brown
- dye
- violet
- 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 Benzidin in molekularem Ver hältnis mit 2'-14Tethyl-3'-nitro-5'-sulfo-l-phe- riyl-5-pyrazolon-3-kai,bonsäure zu einem Zwi schenprodukt vereinigt,
dasselbe in alkali scher Lösung mit 2-Amino-8-naphtol-6-sulfo- säure weiterkuppelt und in dem so gebildeten Disazofarbstoff die Nitrogruppe mit Schwefel natron zur Aminogruppe reduziert.
Der neue Farbstoff bildet ein braun schwarzes Pulver, das sich in Wasser mit violettbrauner, in konzentrierter Schwefelsäure mit blauvioletter Farbe löst. Er färbt unge- beizte Baumwolle in violettbraunen Tönen, welche durch Diazotieren auf der Faser und nachfolgende Entwicklung mit Betanaphtol ohne wesentliche Nuancenänderung waschecht fixiert werden.
<I>Beispiel</I> Zu der Tetrazodiphenyllösung aus 18,4 Teilen Benzidin lässt man bei 0-5 C die Lösung des Trinatriumsalzes von 34,3 Teilen 2'-Methyl- 3'- nitro-5'- sulfo -1-phenyl-5-pyrazo- lon-3-karbonsäure zufliessen.
Sobald unverän derte Tetrazoverbindung nicht mehr nachge wiesen werden kann, 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. Nunmehr wärmt man auf 50 C an, lässt die Lösung von 60 Teilen kristallisiertem Schwefelnatron zufliessen und hält die Temperatur bei 50 C während 12-l5 Stunden bis zum vollständigen Ver schwinden des Schwefelnatrons.
Alsdann wird mit Salzsäure neutralisiert 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 benzidine is used in a molecular ratio with 2'-14Tethyl-3'-nitro-5'-sulfo-1-pheriyl-5-pyrazolone-3-alkali acid combined into an intermediate product,
the same is coupled further in alkaline solution with 2-amino-8-naphthol-6-sulphonic acid 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 violet-brown color, and in concentrated sulfuric acid with a blue-violet color. It dyes unpickled cotton in violet-brown shades, which are fixed by diazotizing on the fiber and subsequent development with betanaphtol without any significant change in shade.
<I> Example </I> The solution of the trisodium salt of 34.3 parts of 2'-methyl-3'-nitro-5'-sulfo -1- is added to the tetrazodiphenyl solution of 18.4 parts of benzidine at 0-5 ° C. phenyl-5-pyrazolone-3-carboxylic acid flow in.
As soon as unchanged tetrazo compound can no longer be detected, 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. The mixture is now warmed to 50 ° C., the solution of 60 parts of crystallized sodium sulphide is allowed to flow in and the temperature is maintained at 50 ° C. for 12-15 hours until the sodium sulphide has completely disappeared.
It is then neutralized with hydrochloric acid and the dye is salted out.
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE121014X | 1925-03-28 | ||
CH119229T | 1925-10-17 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH121014A true CH121014A (en) | 1927-07-01 |
Family
ID=25709198
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH121014D CH121014A (en) | 1925-03-28 | 1925-11-02 | Process for the preparation of a developer dye. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH121014A (en) |
-
1925
- 1925-11-02 CH CH121014D patent/CH121014A/en unknown
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