Abstract: A process for producing amine-formaldehyde microcapsules wherein the reaction of the amine and formaldehyde to form the microcapsule wall is carried out in the presence of a polyol as a systems modifier.

Abstract: A photosensitive transfer imaging system comprising an imaging sheet and a developer sheet; the imaging sheet incudes a photographic support, a layer of photosensitive microcapsules on one surface of the support wherein the microcapsules have a discrete capsule wall and contain a chromogenic material and a photosensitive composition such as a polyethylenically unsaturated compound and a photoinitiator; the developer sheet includes a support member and a layer of a developer composition such as a salicylic acid salt; the imaging sheet and/or the developer sheet additionally includes a plurality of microcapsules which contain an oil in which the chromogenic material is soluble; images are formed by image-wise exposing the imaging sheet to actinic radiation and rupturing the microcapsules in contact with the developer sheet whereupon the chromogenic material is image-wise transferred to the developer sheet.

Abstract: An improved means for exposing and developing photosensitive sheets employing a microencapsulated radiation sensitive composition wherein a cover sheet is adhered to a layer of the microcapsules and following exposure the cover sheet is peeled away to rupture the microcapsules and develop the image. The cover sheet also reduces the oxygen concentration at the surface of the microcapsules and thereby enhances the sensitivity of the imaging sheet.