Mesoionic silver halide stabilizer precursors

Details Mesoionic silver halide stabilizer precursors Mesoionic silver halide stabilizer precursors

C - Chemistry, Metallurgy

07

D

260/313.3

C07D 249/12 (2006.01) G03C 1/43 (2006.01)

Patent

CA 1161045

MESOIONIC SILVER HALIDE STABILIZER PRECURSORS ABSTRACT OF THE DISCLOSURE Mesoionic 1,2,4-triazolium-3-thiolate silver halide stabilizer precursors are novel compounds useful in a heat developable and heat stabilizable photographic silver halide materials and processes. Such novel compounds are represented by the formula: Image wherein R1, R2, R3, R4 and X are as defined herein. After imagewise exposure of the photographic material, a developed and stabilized silver image is produced by heating the element. Mesoionic stabilizer precursors are also useful in photographic silver halide processing compositions.

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