Patent ID: 6660464
Filing Date: 2003-12-09
Classification: G03C

Abstract:
A silver halide photographic element comprising a transparent support with low oxygen permeability and further comprising a cyan dye image-forming unit comprised of 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, and 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 silver halide emulsion layer contains a fragmentable electron donating compound of the formula: Xâ€”Yâ€² or a compound which contains a moiety of the formula â€”Xâ€”Yâ€², wherein: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 a proton, a base, &bgr;âˆ’, is present in the emulsion layer, 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 undergoes a bond cleavage reaction to give the radical Xâ€¢ and the leaving fragment Yâ€²; and, optionally, 3) the radical Xâ€¢ has an oxidation potential&lE;âˆ’0.7V (that is, equal to or more negative than about âˆ’0.7V).