Abstract: A pressure sensitive copy system comprising a plurality of sheets in superposed relationship in which at least one sheet comprises a semi-translucent support bearing either an autogenous layer or a color-developer layer and at least one other sheet comprises a support bearing the other of such layers. The autogenous layer comprises microcapsules and electron-acceptor material in which the microcapsules contain chromogenic material sufficient to form a visible image in the autogenous layer and in the color-developer layer.

Abstract: A multi-ply business form comprising a plurality of sheets in superposed relationship wherein the top sheet comprises a support bearing a localized coating comprising both microscopic pressure rupturable capsules containing a chromogenic material, and an electron acceptor material. At least one underlying sheet can comprise a support bearing a second localized autogenous coating comprising chromogen-containing microscopic pressure rupturable capsules and an electron acceptor material on its upper surface wherein the localized autogenous coatings are non-coextensive.

Abstract: Oil-containing microcapsules are produced by emulsifying an oily solution of isocyanatoamidine products into an aqueous solution of emulsifier to form oil-in-water emulsion. The reactive isocyanatoamidine products are subsequently hydrolyzed into an impermeable capsule wall.

Abstract: A method of desensitizing carbonless paper by subjecting N-vinyl pyrrolidone and a free radical copolymerizable compound having at least one terminal ethylenic group per molecule in situ to ultra violet radiation.