Process for the preparation of high chloride tabular grain emulsions (V)
US5183732A · kind A · utility
17Cited by
9References
17Claims
0Family size
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Key dates
| Filing date | Jan 13, 1992 |
| Grant date | Feb 2, 1993 |
| Priority date | — |
| Expiry date | Jan 13, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C2200/44
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A process of preparing a radiation sensitive high chloride high aspect ratio tabular grain emulsion is disclosed wherein silver ion is introduced into a gelatino-peptizer dispersing medium containing a stoichiometric excess of chloride ions with respect to the silver ions further characterized by a chloride ion concentration of less than 0.5 molar, a pH of at least 4.6, and a grain growth modifier of the formula: ##STR1## where N.sup.4 is an amino moiety and PA0 Z represents the atoms completing a 5 or 6 member ring.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.