| abstract |
A microcapsule especially useful in preparing carbonless copying paper is produced by dispersing or emulsifying a hydrophobic liquid containing a polyisocyanate compound or a prepolymer thereof in an aqueous solution containing an emulsifer to form discontinuous minute particles, adding an active hydrogen-containing compound, allowing to react under application of heat to form a first insoluble membrane on the surface of each minute particle, and, while applying heat, overlaying the first insoluble membrane with a second insoluble membrane of an amino resin. |