Patent ID: 6080536
Filing Date: 2000-06-27
Classification: G03C,Y10S

Abstract:
Method of preparing a photosensitive emulsion comprising tabular silver halide grains rich in silver bromide, having {100} major faces and an aspect ratio more than 1.5, wherein at least 50% of the projected area of all grains is provided by said {100} tabular grains, said method comprising the step of running in a reaction vessel an aqueous silver salt solution and an aqueous alkali halide solution rich in alkali bromide, characterized in that before starting running the said reaction vessel comprises in an aqueous solution of gelatin an amount of amino-modified polyvinyl alcohol, wherein in said aqueous solution the ratio by weight of said amino-modified polyvinyl alcohol to gelatin is at least 1:5 and an upper limit of said ratio is 1:1, and wherein said gelatin is oxidized gelatin, having methionine in an amount of less than 30 .mu.moles per mole of gelatin.