CH201859A - Process for the preparation of an azo dye. - Google Patents
Process for the preparation of an azo dye.Info
- Publication number
- CH201859A CH201859A CH201859DA CH201859A CH 201859 A CH201859 A CH 201859A CH 201859D A CH201859D A CH 201859DA CH 201859 A CH201859 A CH 201859A
- Authority
- CH
- Switzerland
- Prior art keywords
- azo dye
- methyl
- preparation
- dye
- diazotized
- Prior art date
Links
- 239000000987 azo dye Substances 0.000 title claims description 5
- 238000000034 method Methods 0.000 title claims description 4
- 239000000975 dye Substances 0.000 claims description 4
- HVPVUAIKGOKEEE-UHFFFAOYSA-N 2-chloro-6-methyl-4-nitroaniline Chemical compound CC1=CC([N+]([O-])=O)=CC(Cl)=C1N HVPVUAIKGOKEEE-UHFFFAOYSA-N 0.000 claims description 3
- 150000008049 diazo compounds Chemical class 0.000 claims description 3
- 239000010985 leather Substances 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 2
- DCNWQCOXGLGSRC-UHFFFAOYSA-N 2-bromo-6-methyl-4-nitroaniline Chemical compound CC1=CC([N+]([O-])=O)=CC(Br)=C1N DCNWQCOXGLGSRC-UHFFFAOYSA-N 0.000 description 1
- RXQNKKRGJJRMKD-UHFFFAOYSA-N 5-bromo-2-methylaniline Chemical compound CC1=CC=C(Br)C=C1N RXQNKKRGJJRMKD-UHFFFAOYSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 125000000664 diazo group Chemical group [N-]=[N+]=[*] 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
Landscapes
- Coloring (AREA)
Description
Verfahren zur Herstellung eines Azofarbstoffes. Gemäss dem im Hauptpatent beschrie benen Verfahren erhält man einen Leder in braunen Tönen färbenden Azofarbstoff, wenn man 2-Methyl-6-brom-4-nitro-l-aminobenzol diazotiert und die Diazoverbindung mit Di- phenylamin-2-carbon-2'-sulfonsäure kuppelt.
Wie nun weiter gefunden wurde, erhält man einen Azofarbstoff von ganz ähnlichen Eigenschaften, wenn man 2-Methyl-6-chlor- 4-nitranilin diazotiert und die Diazoverbin- dung mit 3-Amino-2-methyl-4'-nitrodiphenyl- amin-2'-sulfosäure kuppelt.
<I>Beispiel:</I> 186,5 Teile 2-Methyl-6-chlor-4-nitranilin werden in üblicher Weise mittels Nitrosyl- schwefelsäure diazotiert. Die wässrige Diazo- lösung wird zu einer Lösung von 343 Teilen des Natriumsalzes der 3-Amino-2-methyl-4'- nitrodiphenylamin - 2'- sulfosäure gegeben.
Nach beendeter Kupplung wird der Farbstoff abfiltriert, gewaschen, mit Alkali gestellt und umgesalzen. Er ist ein dunkelbraunes Pulver, welches Leder in tiefen braunen Tönen färbt.
Process for the preparation of an azo dye. According to the process described in the main patent, an azo dye which dyes leather in brown shades is obtained if 2-methyl-6-bromo-4-nitro-1-aminobenzene is diazotized and the diazo compound is treated with diphenylamine-2-carbon-2'- sulfonic acid couples.
As has now been found, an azo dye with very similar properties is obtained if 2-methyl-6-chloro-4-nitroaniline is diazotized and the diazo compound is reacted with 3-amino-2-methyl-4'-nitrodiphenylamine 2'-sulfonic acid couples.
<I> Example: </I> 186.5 parts of 2-methyl-6-chloro-4-nitroaniline are diazotized in the customary manner using nitrosylsulfuric acid. The aqueous diazo solution is added to a solution of 343 parts of the sodium salt of 3-amino-2-methyl-4'-nitrodiphenylamine-2'-sulfonic acid.
When the coupling has ended, the dye is filtered off, washed, made with alkali and salted. It is a dark brown powder that stains leather in deep brown tones.
Claims (1)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE201859X | 1936-08-26 | ||
| CH198711T | 1938-07-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CH201859A true CH201859A (en) | 1938-12-15 |
Family
ID=25723124
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CH201859D CH201859A (en) | 1936-08-26 | 1937-05-14 | Process for the preparation of an azo dye. |
Country Status (1)
| Country | Link |
|---|---|
| CH (1) | CH201859A (en) |
-
1937
- 1937-05-14 CH CH201859D patent/CH201859A/en unknown
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