Patent ID: 6074811
Filing Date: 2000-06-13
Classification: G03C

Abstract:
A silver halide emulsion comprising at least a dispersion medium and silver halide grains, wherein from 40 to 100% of the total projected area of the entire silver halide grains are occupied by tabular grains having a thickness of from 0.01 to 0.50 .mu.m, an aspect ratio (diameter/thickness) of from 1.6 to 500, and main planes of {100} faces, and the aspect ratio of a right angled parallelogram surrounded by edge sides of {100} face of said tabular grains or a right angled parallelogram formed by extending said edge sides (long side length/short side length) is from 1 to 8, and said tabular grains are tabular grains formed by the adsorption of compound A.sup.0 represented by formula (Z.sup.1), (Z.sup.2), (Z.sup.3) or (Z.sup.4) onto silver halide grains:B.sup.1 --S--B.sup.2 (Z.sup.1)B.sup.1 --S(O)--B.sup.2 (Z.sup.2)B.sup.1 --S(O.sub.2)--B.sup.2 (Z.sup.3)B.sup.1 --S.sup.+ (R.sup.0)--B.sup.2 .multidot.Y.sub.0.sup.-(Z.sup.4)wherein B.sup.1 represents a residue having two or more repeating units of polyvinyl alcohol in B.sup.1 ; --S-- represents a thioether group; B.sup.2 represents a residue having two or more repeating units of polyacrylic acid or polyacrylamide; R.sup.0 represents an alkyl group having from 1 to 20 carbon atoms, an aryl group, or an amino group; and Y.sub.0.sup.- represents an anion.