Abstract: A dual-layer magnetic recording medium including a non-magnetic substrate having a front side and a back side, a lower support layer formed over the front side and a magnetic upper recording layer formed over the lower layer comprising at least one magnetic particle pigment formed over said lower support layer, at least one of said layers of the front coating comprising a polymer binder system for the pigment, such binder system comprising a hard resin component and a soft resin component, wherein the soft resin component comprises a polyurethane polymer, and the hard resin component comprises a nonhalogenated vinyl copolymer comprising a plurality of pendent nitrile groups, a plurality of pendent hydroxyl groups, and at least one pendent dispersing group.

Abstract: A dual-layer magnetic recording medium including a non-magnetic substrate having a front side and a back side, a lower support layer formed over the front side and a magnetic upper recording layer formed over the lower layer, wherein the magnetic layer contains magnetic metallic pigment particles having a coercivity of at least about 2500 Oersteds (Oe), and a binder system for the pigment. The magnetic recording medium exhibits significantly improved broadband signal-to-noise, and skirt signal-to-noise ratios, as well as an improved high frequency carrier-to noise ratio.

Abstract: A dual-layer magnetic recording medium including a non-magnetic substrate having a front side and a back side, a lower support layer formed over the front side and a magnetic upper recording layer formed over the lower layer, wherein the magnetic layer contains magnetic metallic pigment particles having a coercivity of at least about 2500 Oersteds (Oe) and a binder system for the pigment. The magnetic recording medium has fewer than 120 tape dropouts per square inch at a 60% threshold, and fewer than 20 dropouts per square inch at a 40% threshold.

Abstract: Vinyl sulfone and/or .beta.-halo sulfone compounds have been found to improve fog stability on shelf aging of photothermographic imaging elements. These elements comprise a photosensitive silver halide, silver salt oxidizing agent and reducing agent for silver ion in a binder.

Abstract: Chemical sensitization of silver halide photothermographic emulsions used in photothermographic elements, can be effected by the decomposition of sulfur containing compounds on or around the surface of the silver halide grains, usually under oxidizing conditions at elevated temperatures. Alignment of the sulfur containing compounds on the surface of the grains, can be accomplished with spectral sensitizing dyes and appears to be particularly effective in providing strong chemical sensitization effects.