Method for preparing a photographic emulsion, and apparatus for implementing the method
US5709990A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 5, 1996 |
| Grant date | Jan 20, 1998 |
| Priority date | — |
| Expiry date | Dec 5, 2016 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01F2101/56
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The invention relates to a method and a device for preparing a photographic emulsion. In the device of an external loop type of the invention, a solution of a first halide salt X.sub.1.sup.- is introduced at a point in the loop situated outside the reaction zone R within which the silver salt (Ag.sup.+) added to the loop precipitates almost entirely in order to produce silver halide grains or cause them to grow in said solution, the Ag.sup.+ solution being introduced into the reactor in the form of a "centered" jet within said reactor, the Reynolds number Re at the point of introduction of the Ag.sup.+ salt being between approximately 5000 and approximately 50,000.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.