Process for the preparation of high chloride tabular grain emulsions (III)
US5178998A · kind A · utility
17Cited by
12References
17Claims
0Family size
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Key dates
| Filing date | Sep 20, 1991 |
| Grant date | Jan 12, 1993 |
| Priority date | — |
| Expiry date | Sep 20, 2011 |
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 and a grain growth modifier of the formula: ##STR1## where Z.sup.8 is --C(R.sup.8).dbd. or --N.dbd.; PA0 R.sup.8 is H, NH.sub.2 or CH.sub.3 ; and PA0 R.sup.1 is hydrogen or a hydrocarbon of from 1 to 7 carbon atoms.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.