Patent ID: 6518008
Filing Date: 2003-02-11
Classification: G03C

Abstract:
A multicolor negative silver halide photographic element comprising a support bearing a cyan dye image-forming unit comprising at least one red-sensitive silver halide emulsion layer having associated therewith at least one cyan dye-forming coupler, a magenta dye image-forming unit comprising at least one green-sensitive silver halide emulsion layer having associated therewith at least one magenta dye-forming coupler, a yellow dye image-forming unit comprising at least one blue-sensitive silver halide emulsion layer having associated therewith at least one yellow dye-forming coupler, wherein at least one of said blue-sensitive silver halide emulsion layers contains, in combination, a tabular grain silver halide emulsion having an ECD of at least 2.0 &mgr;m and a halide content of at least 95% bromide and less than about 5% iodide, said iodide being substantially uniformly distributed in the silver halide grains of said emulsion, and a fragmentable electron-donating compound, said fragmentable electron-donating compound being of the formulaQâ€”Xâ€”Yâ€²Aâ€”(Xâ€”Yâ€²)k (A)kâ€”Xâ€”Yâ€²Zâ€”(Xâ€”Yâ€²)k or(Z)kâ€”Xâ€”Yâ€²wherein:Z is a light absorbing group; k is 1 or2; A is a silver halide adsorptive group; and Q represents the atoms necessary to form a chromophore comprising an amidinium-ion, a carboxyl-ion or dipolar-amidic chromophoric system when conjugated with Xâ€”Yâ€²; X is an electron donor moiety, Yâ€² is a leaving proton H or a leaving group Y, with the proviso that if Yâ€² is H a base, &bgr;, is covalently linked directly or indirectly to X and wherein: 1) Xâ€”Y â€² has an oxidation potential between 0 and about 1.4 V; and 2) the oxidized form of Xâ€”Yâ€² fragments to give the radical X* and the leaving fragment Yâ€²; and, optionally, 3) the radical X* has an oxidation potential <0.7V.