Process for preparing onium salts
US7863459B2 · kind B2 · utility
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8References
20Claims
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Key dates
| Filing date | Dec 18, 2006 |
| Grant date | Jan 4, 2011 |
| Priority date | — |
| Expiry date | Aug 7, 2027 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B69/04
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
An 'onium salt, e.g. a quaternary ammonium salt, of an anionic dye may be prepared by mixing an aqueous solution of a salt of the dye with a solution of a water-insoluble 'onium salt in an organic solvent, and separating a solution of the 'onium salt of the anionic dye in the organic solvent from the residual aqueous solution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.