Process for the preparation of acid nitro dyestuffs
US4599450A · kind A · utility
1Cited by
2References
20Claims
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Inventor
Key dates
| Filing date | May 10, 1984 |
| Grant date | Jul 8, 1986 |
| Priority date | — |
| Expiry date | May 10, 2004 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD06P3/3206
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Acid nitro dyestuffs are prepared by treating aminonitrodiphenylaminesulfonic acids with an oxidizing agent in an aqueous medium, the oxidizing agent employed being a manganese-(VI) or manganese-(VII) compound and the reaction being carried out at a pH higher than 5 and at a temperature between 20.degree. and 100.degree. C. The dyestuffs thus obtainable dye even fresh full-grained chrome leather in full shades.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.