GB437824A - Improvements relating to the manufacture of azo dyestuffs - Google Patents
Improvements relating to the manufacture of azo dyestuffsInfo
- Publication number
- GB437824A GB437824A GB15323/34A GB1532334A GB437824A GB 437824 A GB437824 A GB 437824A GB 15323/34 A GB15323/34 A GB 15323/34A GB 1532334 A GB1532334 A GB 1532334A GB 437824 A GB437824 A GB 437824A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sodium
- nitrosohydroxylaminates
- naphthylnitrosohydroxylaminate
- solution
- manufacture
- 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
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
- C09B41/00—Special methods of performing the coupling reaction
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Coloring (AREA)
Abstract
Azo dyes are made in substance or on the fibre by subjecting to treatment with nitrous acid in presence of water mixtures containing aromatic nitrosohydroxylaminates and coupling components, resistant to nitrous acid under the reaction conditions. The nitrosohydroxylaminates are converted into the corresponding diazo compounds. In examples: (1) an alkaline solution of sodium phenyl-, o-tolyl- or a -naphthylnitrosohydroxylaminate, sodium nitrite and sodium 2-naphthol-3-carboxyanilide (which is stable) is acidified to yeild the corresponding azo dye; (2) cotton is impregnated with a solution containing sodium a -naphthylnitrosohydroxylaminate, sodium nitrite and the o-toluidide of 2 : 3-oxynaphthoic acid and the colour developed by acidification. The azo dyes are also formed by passing a current of nitrous gases into the solution of the nitrosohydroxylaminate and naphtholate.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR437824X | 1933-05-20 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB437824A true GB437824A (en) | 1935-11-06 |
Family
ID=8899830
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB15323/34A Expired GB437824A (en) | 1933-05-20 | 1934-05-22 | Improvements relating to the manufacture of azo dyestuffs |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB437824A (en) |
-
1934
- 1934-05-22 GB GB15323/34A patent/GB437824A/en not_active Expired
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