Abstract: This invention concerns monosubstituted dithiooxamides, and a preferred class comprises those wherein the substituent is such that the resulting dithiooxamide derivative is substantially nonvolatile at about room temperature. Preferred materials are those for which when the monosubstituent dithiooxamide is complexed with a transition metal cation, the resulting polymer is substantially a dark, i.e., preferably blue or blue-black color. Carbonless paper constructions involving use of N-(monosubstituted)dithiooxamides to advantage are described.

Abstract: Hot-melt imaging compositions useful for solventless coating on paper substrates. The imaging compositions comprise imaging microcapsules having melamine-urea-formaldehyde condensation polymer shells and an organic liquid dye precursor dispersed in a hot-melt binder. The compositions can be coated on paper substrates by conventional coating techniques to provide carbonless papers.