GB441178A - Manufacture of azo-dyestuffs - Google Patents
Manufacture of azo-dyestuffsInfo
- Publication number
- GB441178A GB441178A GB11875/35A GB1187535A GB441178A GB 441178 A GB441178 A GB 441178A GB 11875/35 A GB11875/35 A GB 11875/35A GB 1187535 A GB1187535 A GB 1187535A GB 441178 A GB441178 A GB 441178A
- Authority
- GB
- United Kingdom
- Prior art keywords
- acid
- nitramine
- azo
- anilide
- alkaline solution
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Landscapes
- Coloring (AREA)
Abstract
Azo dyes are prepared by coupling a nitramine of the formula <FORM:0441178/IV/1> wherein the p-position to the nitramine group is free, in a neutral or weakly alkaline solution with a diazo compound which is not at all or only very gradually changed by dilute alkalies. In an example the sodium salt of the nitramine from a -naphthylamine is coupled with diazotized o-anisidine in presence of sodium carbonate. The alkaline solution of the product may be further diazotized by means of acid and alkali nitrite and used as described in Specifications 430,167 and 430,222; for example cotton may be printed with a mixture of the sodium salt of the new azo-dye, alkali nitrite and 2.3-oxynaphthoic acid anilide, dried, passed through an acid bath and, if desired, treated with an acid-binding agent (black-violet tints); black tints are obtained by substituting the b -naphthylamide for the anilide.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH441178X | 1934-04-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB441178A true GB441178A (en) | 1936-01-14 |
Family
ID=4515200
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB11875/35A Expired GB441178A (en) | 1934-04-19 | 1935-04-17 | Manufacture of azo-dyestuffs |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB441178A (en) |
-
1935
- 1935-04-17 GB GB11875/35A patent/GB441178A/en not_active Expired
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