Process for the preparation of high chloride tabular grain emulsions
US5061617A · kind A · utility
128Cited by
10References
17Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 7, 1990 |
| Grant date | Oct 29, 1991 |
| Priority date | — |
| Expiry date | Dec 7, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C2200/43
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An improved process is disclosed of preparing a high chloride tabular grain emulsion. The concentration of thiocyanate ion in the dispersing medium at nucleation and during grain growth is relied upon a favor the formation of {111} crystal faces. The concentration of chloride ion in the thiocyanate ion containing dispersing medium is relied upon to produce the grain twinning necessary for tabular grain formation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.