Photothermographic elements

A black-and-white photothermographic emulsion comprising a silver salt of an organic acid, silver halide, a toner that is a phthalazine, and a binder consisting essentially of a hydrophobic synthetic polymer binder, said emulsion also containing an antifoggant comprising a vinyl sulfone.

A photothermographic emulsion comprising a silver salt of an organic acid, silver halide, a reducing agent for silver ion, a toner that is a phthalazine, and a hydrophobic polymer binder, said emulsion also containing an antifoggant comprising a vinyl sulfone with no hardening of said binder by said vinyl sulfone.

A photothermographic emulsion comprising a silver salt of an organic acid, silver halide, a reducing agent for silver ion, a toner that is phthalazine, and a binder consisting essentially of a hydrophobic polymer binder, said emulsion also containing an antifoggant comprising a vinyl sulfone which antifoggant does not harden said binder.

A photothermographic element comprising a substrate having on at least one surface thereof a single photothermographic emulsion layer comprising a silver salt of an organic acid, silver halide, a reducing agent for silver ion, a toner that is a phthalazine, and a binder, said emulsion containing an antifogging amount of a sulfone antifoggant comprising a vinyl sulfone said binder consisting of a hydrophobic polymer.