Abstract: Disclosed is a method for improving the photo-induced discharge characteristics of certain cadmium chalcogenides selected from the group of CdS, CdTe, CdAs, CdSe and CdSSe. The method involves calcining a mixture of the cadmium chalcogenide or a precurser thereof in the presence of cadmium oxide or a compound which decomposes upon heating to cadmium oxide in an amount sufficient to provide an excess of unreacted cadmium oxide after calcination.

Abstract: Disclosed is a photosensitive device for use in electrostatographic copying. The device comprises:A. an endless, arcuate substrate; andB. a thin, conductive filament having a layer on its surface of a photoconductive insulating material wrapped in helical configuration around said substrate. The filament is connected to ground or to a suitable bias source. In one embodiment of the invention, the filament layer is overcoated with a thin layer of an insulating organic resin to provide a device with a dielectric storage layer on its exposed surface. In another embodiment, the overcoating is not applied thereby providing an electrostatographic gravure member suitable for use with certain liquid developed imaging techniques.

Abstract: Polymeric matrices such as poly(vinylchloride) and poly(methylmethacrylate) loaded with mixtures of an organopolyselenide characterized by the formula:R.sub.1 -- (Se).sub.n -- R.sub.2and an organomercury compound characterized by the formula:R.sub.3 --Hg--R.sub.4form the basis for high resolution and contrast microimaging film systems. Irradiation of these films with activating radiation results in dark images in light struck areas and colorless background. The microimaging film is a negative working system with add-on reimaging capability. The images are stable to projection in conventional slide projection systems.

Abstract: Disclosed is a method of duplicating and imaged master comprised of a marking material distributed in an imagewise manner upon a substrate. The method involves contacting the master with a highly viscoelastic inking composition comprising:A. a silicon containing block copolymer having polymeric silicone segments and polymeric segments of a material which is adhesive to the material comprising the image;B. a coloring agent; andC. a solvent in which the copolymer is soluble but which is a non-solvent for the marking material. The inked master is then contacted under pressure with a transfer member to thereby transfer the ink to the transfer member in imagewise configuration.

Abstract: Disclosed is a novel method for the preparation of aromatic organic diselenide compounds. The method involves reacting an alkali metal diselenide with certain halogenated aromatic compounds in dimethylformamide to form the corresponding aromatic diselenide. The use of dimethylformamide enables one to prepare certain aromatic diselenide compounds containing two replaceable halogen atoms in a one-step process.

Abstract: Disclosed is a method for the preparation of a relief printing master which is based on irradiation of a film of a composition comprisingA. a degradable polymer containing segments characterized by the structural formula ##EQU1## wherein R is H, an alkyl radical of 1 to 6 carbon atoms, a chlorine or fluorine substituted alkyl radical of 1 to 6 carbon atoms or a cyano substituted aliphatic hydrocarbon radical of 1 to 5 carbon atoms, andB. a photosensitizer which upon exposure to actinic radiation assumes a .sup.3 (n, .pi.*) or a .sup.1 (n, .pi.*) state.The polymer and photosensitizer combination, which is in the form of a thin film upon a suitable substrate, is exposed in an imagewise manner to actinic radiation to thereby degrade the polymer. Upon such degradation, depressions are formed in the exposed areas thereby rendering the exposed film suitable for use as a relief printing master.

Abstract: Disclosed is an improved method for the preparation of an electrostatographic photoreceptor comprised of a layer of an organic active transport or insulating material overcoating a layer of a photoconductive material in operative connection with a conductive substrate. The method involves preparing a uniform liquid dispersion of the organic material in an appropriate solvent as a carrier phase having a pigmentary photoconductive material dispersed in it as a dispersed phase. The liquid dispersion is coated onto a conductive substrate and exposed to a direct stream of corona ions or a high intensity DC electric field, without contacting its surface with an electrode, to cause separation of the two phases into a two layered structure with the layer of photoconductive material being deposited between the substrate and the solution of organic material. Drying the structure by removing the solvent for the organic material provides the finished photoreceptor.

Abstract: Disclosed is a method for forming a visible image. The method involves exposing in an imagewise manner a mixture of a halogenated polymer having halogen atoms on alternating carbon atoms and a strong organic electron acceptor to actinic radiation to induce dehydrohalogenation of the polymer. The exposed composition is then subjected to heat in order to provide a visible image.