CH174266A - Process for the preparation of an azo dye. - Google Patents
Process for the preparation of an azo dye.Info
- Publication number
- CH174266A CH174266A CH174266DA CH174266A CH 174266 A CH174266 A CH 174266A CH 174266D A CH174266D A CH 174266DA CH 174266 A CH174266 A CH 174266A
- Authority
- CH
- Switzerland
- Prior art keywords
- mol
- diazotized
- azo dye
- nitro
- preparation
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
- C09B33/00—Disazo and polyazo dyes of the types A->K<-B, A->B->K<-C, or the like, prepared by diazotising and coupling
- C09B33/18—Trisazo or higher polyazo dyes
- C09B33/24—Trisazo dyes of the type
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
- C09B33/00—Disazo and polyazo dyes of the types A->K<-B, A->B->K<-C, or the like, prepared by diazotising and coupling
- C09B33/18—Trisazo or higher polyazo dyes
- C09B33/30—Tetrazo dyes of the type
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Coloring (AREA)
Description
<B>Zusatzpatent</B> zum Hauptpatent Nr. 170089. Verfahren zur Herstellung eines Azofarbstoffes. Gemäss dem im Hauptpatent beschriebe nen Verfahren erhält man einen wertvollen Azofarbstoff, wenn man 1 Mol 1-Amino-8- oxyiiaphtlialin-3.6-disulfosäure diazotiert,
die Diazoverbindung mit 1 Mol 1.3-Dioxybenzol in alkalischer Lösung kuppelt und den so erhaltenen Monoazofarbstoff mit 2 Mol diazo- tiertem 2 - Nitro - l . 4 - diaminobenzol weiter kuppelt.
Wie nun weiter gefunden wurde, erhält mau einen Leder in rotstickig graubraunen Tönen färbenden Farbstoff, wenn man den zunächst erhaltenen Monoazofarbstoff mit 1 Mol diazotiertem 2-Nitro-1.4-diaminoberizol und 1 Mol diazotierter 4-Nitro-l-aminobenzol- 2-sulfosäure kuppelt.
<I>Beispiel:</I> 48,4 Teile des Monoazofarbstoffes aus diazotierter 1-Amino-8-oxynaphthaliii-3.6- disulfosäure und 1.3-Dioxybenzol werdet) in 1000 Teilen Wasser und 8 Teilen Natrium hydroxyd gelöst. 19 Teile salzsaures 2-Nitro- 1.4-diaminobenzol werden in der üblichen Weise diazotiert. Die Lösung der Diazover- bindung läuft bei<B>100</B> zu der des Monoazo- farbstoffes gleichzeitig mit 6 Teilen Natrium hydroxyd gelöst in 100 Teilen Wasser.
Nach etwa einer Stunde lässt man die aus 21,8 Teilen 4-Nitro-i-aminobenzol-2-sulfosäure bereitete Diazoverbindung mit 6 Teilen Natrium hydroxyd, in 100 Teilen Wasser gelöst, ein laufen. Der Farbstoff wird, wie üblich, ab geschieden und aufgearbeitet, er färbt Leder rotstichig graubraun.
<B> Additional patent </B> to main patent no. 170089. Process for the production of an azo dye. According to the process described in the main patent, a valuable azo dye is obtained if 1 mole of 1-amino-8-oxyiiaphtlialin-3,6-disulfonic acid is diazotized,
the diazo compound is coupled with 1 mol of 1,3-dioxybenzene in alkaline solution and the monoazo dye thus obtained is coupled with 2 mol of diazotized 2-nitro-1. 4 - diaminobenzene further couples.
As has now been found, a leather is obtained in red-embroidered gray-brown tones if the initially obtained monoazo dye is coupled with 1 mol of diazotized 2-nitro-1,4-diaminoberizole and 1 mol of diazotized 4-nitro-1-aminobenzene-2-sulfonic acid .
<I> Example: </I> 48.4 parts of the monoazo dye from diazotized 1-amino-8-oxynaphthalene-3.6-disulfonic acid and 1.3-dioxybenzene are dissolved in 1000 parts of water and 8 parts of sodium hydroxide. 19 parts of hydrochloric acid 2-nitro-1,4-diaminobenzene are diazotized in the usual way. The solution of the diazo compound runs at <B> 100 </B> to that of the monoazo dye simultaneously with 6 parts of sodium hydroxide dissolved in 100 parts of water.
After about an hour, the diazo compound, prepared from 21.8 parts of 4-nitro-i-aminobenzene-2-sulfonic acid, is run in with 6 parts of sodium hydroxide, dissolved in 100 parts of water. The dye is, as usual, separated and worked up, it dyes leather with a reddish gray-brown.
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH174266T | 1934-04-09 | ||
CH170089T | 1934-04-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH174266A true CH174266A (en) | 1934-12-31 |
Family
ID=25718847
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH174266D CH174266A (en) | 1934-04-09 | 1934-04-09 | Process for the preparation of an azo dye. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH174266A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4988804A (en) * | 1987-11-10 | 1991-01-29 | Ciba-Geigy Corporation | Polyazo dyes obtained by successive coupling of H-acid and two further anilinic diazo components on resorcinol or the like |
-
1934
- 1934-04-09 CH CH174266D patent/CH174266A/en unknown
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4988804A (en) * | 1987-11-10 | 1991-01-29 | Ciba-Geigy Corporation | Polyazo dyes obtained by successive coupling of H-acid and two further anilinic diazo components on resorcinol or the like |
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