Patent ID: 6514683
Filing Date: 2003-02-04
Classification: G03C

Abstract:
A photographic element comprising at least one light-sensitive silver halide emulsion layer containing 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;whereinX 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 3) the radical Xâ€¢ has an oxidation potential &lE;âˆ’0.7V; said photographic element further comprising a reductone of the Formula 2: wherein R23 and R24 are the same or different, and may represent H, alkyl, cycloalkyl, aryl, or an alkyl group with a solubilizing group, or R23 and R24 may be joined to complete a heterocyclic ring, R21 and R22 are H, OH, alkyl, aryl, cycloalkyl, or may together represent an alkylidene group, n is 1 or 2 and R20 is H, alkyl, aryl, or CO2R25 where R25 is alkyl.