Abstract: There is described a novel thermographic recording film, and more specifically, a novel image-forming system incorporated therein comprising at least one layer and including and a Lewis acid material, a di- or triarylmethane thiolactone dye precursor, an acidic organic material, a binder and a thermal stabilizer.Thermographic recording films comprising the novel image-forming system of the present invention exhibit excellent thermal stability, and desirable minimum optical densities, indicative of substantially less premature image development at elevated environmental temperatures.Embodiments of the invention wherein the thermographic recording films further include a light insensitive organic silver salt, a reducing agent, a binder and, preferably, a toning agent, show substantially enhanced image density.

Abstract: There is described a novel thermographic recording film, and more specifically, a novel image-forming system incorporated therein which employs both thiolactone and silver reduction chemistries.Thermographic recording films comprising the novel image-forming system of the present invention exhibit excellent thermal sensitivity and visual color saturation, enhanced image density, and desirable visual minimum optical densities.

Abstract: A thermally-activatable overcoat-releasing laminate useful for the application of a protective overcoat onto a planar surface, such as a binary image surface on a peel-developed laminar imaging medium, is provided. The overcoat-releasing laminate comprises a durable layer and an adhesive layer firmly interconnected at an interface, the firm interconnection being resultant of polymerization of a photopolymerizable monomer by exposure to ultraviolet radiation. As effected by the firm interconnection, use of the overcoat-releasing laminate is characterized by reliable release of the protective overcoat from a carrier web.