Patent ID: 6509144
Filing Date: 2003-01-21
Classification: G03C

Abstract:
A photographic element comprising a support and at least one blue sensitive silver halide emulsion layer containing a tabular grain silver halide emulsion spectrally sensitized with at least one dye providing a peak sensitization between 446 and 500 nm and at least one dye providing a peak sensitization between 400 and 445 nm and additionally sensitized with a fragmentable electron donor of the formula:Qâ€”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 or 2; 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€”Yâ€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 Xâ€¢ and the leaving fragment Yâ€²; and, optionally, 3) the radical Xâ€¢ has an oxidation potential &lE;0.7 V.