Methods of preparation of precipitated coupler dispersions with increased photographic activity
US4970139A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 2, 1989 |
| Grant date | Nov 13, 1990 |
| Priority date | — |
| Expiry date | Oct 2, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C7/388
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Base and auxiliary solvent solubilized precipitated dispersions of couplers and other photographic materials usually produce very small particle dispersions, and usually such dispersions are extremely highly reactive because of the smallness of the particle size. However, some relatively more hydrophobic couplers, even though they produce small particles when a dispersion is formed by the precipitation technique, lead to extremely unreactive dispersions. The method of this invention constitutes a single step precipitation technique where a permanent high boiling water insoluble coupler solvent is incorporated into the precipitated particles to produce photographically highly active coupler dispersions. The invention is performed by providing a first flow of a crude emulsion of a high boiling water insoluble permanent coupler solvent in aqueous surfactant solution and a second flow comprising a basic solution of the coupler in a water miscible volatile auxiliary solvent and mixing the said first and second streams either simultaneously or immediately following thereof, neutralizing said streams with an acid solution. Such immediate neutralization protects any hydrolizable surfactant…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.