Process for the preparation of high chloride tabular grain...

Details Process for the preparation of high chloride tabular grain... Process for the preparation of high chloride tabular grain...

G - Physics

03

C

G03C 1/035 (2006.01) G03C 1/005 (2006.01) G03C 1/07 (2006.01) G03C 1/015 (2006.01)

Patent

CA 2077010

IMPROVED PROCESS FOR THE PREPARATION OF HIGH CHLORIDE TABULAR GRAIN EMULSIONS (II) Abstract of the Disclosure 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 of less than 0.5 molar and a grain growth modifier of the formula: Image where Z2 is -C(R2)= or -N=; Z3 is -C(R3)= or -N=; Z4 is -C(R4)= or -N=; Z5 is -C(R5)= or -N=; Z6 is -C(R6)= or -N=; with the proviso that no more than one of Z4, Z5 and Z6 is -N=; R2 is H, NH2 or CH3; R3, R4 and R5 are independently selected, R3 and R5 being hydrogen, hydroxy, halogen, amino or hydrocar- bon and R4 being hydrogen, halogen or hydrocarbon, each hydrocarbon moiety containing from 1 to 7 carbon atoms; and R6 is H or NH2.

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