Loading patent…
AssigneeEastman Kodak Company
InventorsKenneth J. Reed, James A. Friday, John E. Keevert, Stephen P. Singer, Mary C. Brick
Estimating the term…
This invention relates to a negative silver halide photographic element comprising a support and a silver halide imaging layer containing a light sensitive silver halide imaging emulsion, said silver halide imaging layer further comprising a separately precipitated non-imaging intentionally fogged fine grain emulsion and an electron transfer agent releasing compound represented by formula (I): CAR1-(L)n-ETA (I) wherein: CAR1 is a carrier moiety which is capable of releasing -(L)n-ETA on reaction with oxidized developing agent; L is a divalent linking group, n is 0, 1 or 2; and ETA is a releasable electron transfer agent, and (optionally) a development accelerator releasing compound represented by the formula (II): CAR2—(SAM)-NX1—NX2X3 (II) wherein: CAR2 is a carrier moiety which is capable of releasing —(SAM)-NX1—NX2X3 on reaction with oxidized developing agent; SAM is a silver absorbable moiety attached to the carrier moiety and is released on reaction with oxidized development agent; and —NX1—NX2X3 is a hydrazine group wherein X1, X2 and X3 are individually hydrogen or a substituent chosen from alkyl, aryl, carbonyl, or sulfonyl groups with the proviso that at least one of X1, X2 and X3 is hydrogen.
A negative silver halide photographic element comprising a support and a silver halide imaging layer containing a light sensitive silver halide imaging emulsion, said silver halide imaging layer further comprising a separately precipitated non-imaging intentionally fogged fine grain emulsion, an electron transfer agent releasing compound represented by formula (I) and a development accelerator releasing compound represented by formula (II):
The negative silver halide photographic element of claim (1) wherein CAR1 and CAR2 are both phenol or naphthol coupler moieties.
The negative silver halide photographic element of claim (1) wherein the electron transfer agent releasing compound is contained in the silver halide imaging layer at a concentration from 6 μmole/m2 to 1000 μmole/m2, and the development accelerator releasing compound is contained in the silver halide imaging layer at a concentration from 0.1 μmole/m2 to 25 μmole/m2.
The negative silver halide photographic element of claim (1) wherein the SAM moiety of the development accelerator releasing compound is a nitrogen containing heterocycle with at least one N—H in its released form according to formula SAM-1:
The negative silver halide photographic element of claim (1) wherein the SAM moiety of the development accelerator releasing compound is a sulfur atom.
The negative silver halide photographic element of claim (1) wherein the SAM moiety is a heterocycle with a free —SH (or its tautomeric equivalent) in its released form according to formula SAM-2,
The negative silver halide photographic element of claim (1) wherein X1 and X2 of the development accelerator releasing compound is individually hydrogen or an acyl or alkoxycarbonyl group containing 1 to 6 carbon atoms, and X3 is an acyl group, a thioacyl group, a carbamoyl group, an alkyloxycarbonyl group, an aryloxycarbonyl group, an oxalate or oxalate ester group, an oxalamido group, a sulfonyl group or a sulfamoyl group, each of which may contain 1 to 7 carbon atoms.
Dependencies are inferred from the claim text.