Chloride containing tabular grain emulsions and processes for their preparation employing a low methionine gelatino-peptizer
US4713323A · kind A · utility
53Cited by
3References
30Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 17, 1987 |
| Grant date | Dec 15, 1987 |
| Priority date | — |
| Expiry date | Feb 17, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C2200/03
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention is directed to a process of precipitating for use in photography a high aspect ratio tabular grain emulsion employing a dispersing medium containing a gelatino-peptizer comprised of less than 30 micromoles of methionine per gram and at least a 0.5 molar concentration of chloride ion. A wide range of chloride ion concentrations in the tabular grains can be achieved while avoiding the use of tabular grain thickening ripening agents and synthetic peptizers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.