Stable and storable aqueous dispersions of primary aromatic amines, their preparation and use
US3990985A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 21, 1974 |
| Grant date | Nov 9, 1976 |
| Priority date | — |
| Expiry date | Mar 21, 1994 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K23/00
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Aqueous dispersions of primary aromatic amines which contain at least 30 per cent by weight of a primary aromatic amine, a water-soluble condensation product which contains 2 to 6 radicals of oxalkylated aromatic compounds carrying hydroxy or carboxy groups, these radicals being linked to each other over methylene groups either directly or via radicals of aromatic compounds, and containing water and, optionally, a polyvalent alcohol. These dispersions are very stable and storable for a very long period, the primary aromatic amines therein are so finely dispersed that they do not precipitate; they have a low viscosity and can easily be introduced with stirring in a dyeing liquor or in pastes. These novel dispersions are suitable for the preparation of water-insoluble azo dyestuffs according to the methods of ice-color technique by mixing them with a sodium nitrite solution and a hydrochloric acid solution for diazotization thereafter, the diazo compounds obtained may be used in known and usual manner for the preparation of the dyestuffs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.