Process for the preparation of high chloride tabular grain emulsions (IV)
US5185239A · kind A · utility
23Cited by
9References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 13, 1992 |
| Grant date | Feb 9, 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 triaminopyrimidine grain growth modifier containing mutually independent 4, 5 and 6 ring position amino substituents, the 4 and 6 ring position substituents being hydroamino substituents.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.