Process for the preparation of high chloride tabular grain emulsions (III)
AssigneeEastman Kodak Company
InventorsJoe E. Maskasky, Yun C. Chang
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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.; R.sup.8 is H, NH.sub.2 or CH.sub.3 ; and R.sup.1 is hydrogen or a hydrocarbon of from 1 to 7 carbon atoms.
Claims17
A process of preparing a radiation sensitive high aspect ratio tabular grain emulsion, wherein tabular grains of less than 0.3 .mu.m in thickness and an average aspect ratio of greater than 8:1 account for greater than 50 percent of the total grain projected area, said tabular grains containing at least 50 mole percent chloride, based on silver, comprising
- introducing silver ion 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:
- ##STR15## where Z.sup.8 is --C(R.sup.8).dbd. or --N.dbd.;
- R.sup.8 is H, NH.sub.2 of CH.sub.3 ;
- and
- R.sup.1 is hydrogen or a hydrocarbon of from 1 to 7 carbon atoms.
Dependencies are inferred from the claim text.