Process for the preparation of high chloride tabular grain emulsions (V)
AssigneeEastman Kodak Company
InventorJoe E. Maskasky
Life of this patent
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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, 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 Z represents the atoms completing a 5 or 6 member ring.
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,
- a pH of from 4.6 to 9.0, and
- a grain growth modifier of the formula:
- ##STR13## where N.sup.4 is an amino moiety and
- Z represents the atoms completing a 5 or 6 member ring.
A process of preparing a radiation sensitive high aspect ratio tabular grain emulsion, wherein tabular grains of less than 0.2 .mu.m in thickness and an average aspect ratio of greater than 8:1 account for greater than 70 percent of the total grain projected area, said tabular grains containing at least 50 mole percent chloride and less than 2 mole percent iodide, 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 0.2 molar,
- a pH of from 5.0 to 8, and
- adenine in a concentration of from 7.times.10.sup.-4 to 0.01 molar.
Dependencies are inferred from the claim text.