Class of grain growth modifiers for the preparation of high chloride {111} t
AssigneeEastman Kodak Company
InventorJoe E. Maskasky
Life of this patent
Estimating the term…
Abstract
A process is disclosed of preparing a high chloride {111} tabular grain emulsion. Tabular grains are formed having {111} major faces, containing at least 50 mole percent chloride and less than 5 mole percent iodide, based on silver, and accounting for at least 50 percent of total grain projected area by introducing silver ion into a gelatino-peptizer dispersing medium containing a stoichiometric excess of chloride ions with respect to silver ions and an iodo-substituted 8-hydroxyquinoline, which acts as a grain growth modifier.
Claims11
A process of preparing a high chloride {111} tabular grain emulsion, wherein tabular grains are formed having {111} major faces, containing at least 50 mole percent chloride and less than 5 mole percent iodide, based on silver, and accounting for at least 50 percent of total grain projected area, comprising introducing silver ion into a gelatino-peptizer dispersing medium containing a stoichiometric excess of chloride ions with respect to silver ions and a grain growth modifier,
- wherein the grain growth modifier is an iodo-substituted 8-hydroxyquinoline.
Dependencies are inferred from the claim text.