Abstract: Image-forming member for electrophotography comprising a charge generation layer composed of hydrogenated amorphous silicon.

Abstract: A photoconductive member comprising a support for photoconductive member, a photoconductive layer constituted of an amorphous material comprising silicon atom as a matrix and a barrier layer between said support and said photoconductive layer, said barrier layer having a double-layer structure of a first barrier layer constituted of an amorphous material comprising silicon atom as a matrix and containing impurities which control the property of conductivity and a second barrier layer constituted of an electrically insulating material different from said amorphous material constituting said first barrier layer.

Abstract: A novel photosensitive composition including a photoconductive cadmium sulfide-group compound and a water-soluble prepolymer capable of forming a network structure by cross-linking, the composition being applied as a photosensitive layer of a photosensitive article for electrophotography having a conductive substrate.

Abstract: A xeroradiographic material comprising a substrate at least one surface of which is electrically conductive, and an X-ray sensitive layer provided on the conductive surface of the substrate and essentially consisting of an organic binder, .gamma.-form crystal grains of a bismuth oxide-based compound oxide and n-type semiconductor grains dispersed in the organic binder. The material is made by dispersing these grains in an organic binder solution, applying the dispersion onto the conductive surface of the substrate, drying the coat of the dispersion at a temperature in a range not lower than the boiling point of the solvent but below the softening point of the organic binder to form an X-ray sensitive layer, and heat-treating the X-ray sensitive layer at a temperature in a range not lower than the softening point of the organic binder but below the temperature at which the organic binder begins decomposing.

Abstract: A photoconductive element comprising elemental selenium dispersed in an insulating polymer is prepared by reducing an inorganic selenium compound in the presence of the insulating polymer. The invention also provide a process for preparing an electrophotosensitive material having a photoconductive layer in which reduction of the inorganic selenium compound is performed in a layer coated on a conductive support.

Abstract: An electrostatic method of making transparencies and apparatus for practicing said method. An endless electrophotographic belt is charged, imaged and toned with a liquid toner suspension. The belt with the toned image is brought into close proximity to a precisely dimensioned gap defined by a heated roller over which is passed a strip of transfer material comprising a transparent substrate carrying a thin ohmic layer bonded thereto and a thin overcoat of resinous material on the ohmic layer and bonded thereto. An electrical bias is applied across the gap between the belt and the overcoated ohmic layer. The toner particles migrate electrophoretically toward the overcoated substrate. Heat is applied sufficient to melt the overcoating just prior or during the application of the electrical bias so that transfer occurs due to electrophoretic migration through the melt, thus embedding the transferred toner particles of the toner image within the resin. The transfer material is quickly cooled.

Abstract: An electrostatic method of making transparencies and apparatus for practicing said method. An endless electrophotographic belt is charged, imaged and toned with a liquid toner suspension. The belt with the toned image is brought into close proximity to a precisely dimensioned gap defined by a transfer roller along with a sheet of transfer material comprising a transparent substrate polyester carrying a thin ohmic layer bonded thereto and a thin overcoat of a compatible resinous material on the ohmic layer and bonded thereto. An electrical bias is applied across the gap between the belt and the overcoated ohmic layer. The toner particles migrate electrophoretically toward the transfer sheet. Subsequent to transfer, heat is applied to the transfer sheet sufficient to soften the overcoating embedding the transferred toner particles of the toner image within the resin. The transfer material is cooled.

Abstract: In an electrophotographic plate comprising a substrate and a photoconductive layer formed on said substrate, when said substrate is made of an age-hardening type aluminum alloy and has a Vickers hardness of 60 Hv or higher, there can be produced electrophotographic plates high in dimensional accuracy, good in resistance to mechanical damages and impact, and very small in eccentricity when molded in the form of a drum. When the surface hardness of the selenium photoconductive layer is made 5 H or harder in pencil hardness, the resulting electrophotographic plate is excellent in printing performance and has a long life.

Abstract: In a process for laminating a photosensitive layer to a aluminum or copper substrate surface by means of nip rolls, the improvement comprising the sequential steps of:(a) rendering the substrate surface clean, as defined by the uniform water film test;(b) within about 1 minute after rendering the substrate clean and immediately prior to lamination, applying a thin layer of liquid to form an interface between the substrate surface and the photosensitive layer;(c) displacing the thin layer of liquid from the interface by absorption into the photosensitive layer during lamination, and(d) within 30 seconds after lamination, removing the support for the photosensitive layer without delamination of the photosensitive layer from the substrate by bending the support back along a longitudinal axis of the photosensitive layer.

Abstract: An improvement in the method of preparing a coating or layer of reprographic material upon a substrate which includes the conventional steps of coating the substrate surface with a layer of resinous binder curable upon exposure to radiant energy including electron beam and ultraviolet radiation, the binder layer containing reprographic solids. The resinous binder is applied as a fluid and is irradiated until a coherent and adherent layer is formed. The method includes the steps of forceably applying and tautly maintaining a sheet of a smooth flexible film against the surface of the curable resinous binder while directing a beam of radiant energy through the sheet and onto the binder while the layer of flexible film is held thereagainst. The exposure to radiant energy is continued until the resinous binder is substantially completely cured, whereupon the sheet of flexible film is removed from the surface of the binder.

Abstract: Disclosed is a photoconductor of the cadmium sulfide/cadmium carbonate type which contains cadmium oxide in the range of 0.05 to 1.5 mole per cent. The calcination of this photoconductor is performed at the relatively high temperature range of approximately 250 degrees C. to 310 degrees C. in an inert atmosphere or in air, with between 265 degrees C. to 290 degrees C. being preferred. The resultant photoconductor, which can be used in both toner transfer and charge transfer electrophotography, has a higher photographic speed, faster discharge of residual charge, and less degradation of electrophotographic properties, particularly charge acceptance, at high humidities.

Abstract: Disclosed is a panchromatic photoconductive element for electrophotography having a layered structure comprising a substrate, a barrier layer and a photoconductive layer. The barrier layer inhibits injection of carriers from the substrate. Amorphous silicon forms a matrix for either the photoconductive layer or the barrier layer.

Abstract: A photoconductive layer is produced upon a substrate by coating the substrate with a solution in an organic solvent of a polyamic acid and of 2,4,7-trinitro-9-fluorenone (TNF) and/or 2,3,4,7-tetranitro-9-fluorenone and heating the coated substrate at a temperature not exceeding 150.degree. C. to form on the substrate a polyimide coating containing the said fluorenone compound as a photosensitizer.

Abstract: This invention relates to an improvement in the process for the manufacture of printing forms and printed circuits by coating an electrically conductive support with an organic photoconductor layer and by charging, exposing, and developing the electrostatic image by means of a finely particulate toner, fixing and dissolving the layer away from the non-image areas by means of a decoating medium and, if appropriate, etching of the bared support surface, the improvement which comprises, for the purpose of coating, transferring the organic photoconductor layer on a temporary support to the electrically conductive support with the aid of heat and pressure.

Abstract: A function separated type electrophotographic light-sensitive member and a process for production thereof are described, said member comprising an electrically conductive support, a light-sensitive layer made of a hydrogen-doped amorphous silicon semiconductor, and an organic electric charge transport layer containing at least one positive charge transport carrier selected from the group consisting of pyrazolines, aryl-alkanes, arylketones, arylamines and chalcones.

Abstract: An electrophotographic magnetic imaging member comprises a conductive, magnetizable layer in contact with a photoconductive layer. An electrostatic latent image is formed on the photoconductive layer utilizing the conductive, magnetizable layer as a conductive electrode in carrying out the electrophotographic discharge step. The conductive, magnetizable layer is also magnetized with a selected spatial wavelength of magnetic transitions. The electrostatic latent image is developed with toner which reflects or absorbs visible electromagnetic radiation. The imaging member is exposed to visible electromagnetic radiation from the photoconductive side. In one embodiment, the visible radiation is absorbed or reflected by the toned image and is transmitted through uncovered portions of the photoconductor, heating the conductive, magnetizable layer and thermoremanently erasing magnetic transitions in the magnetizable layer.

Abstract: A process for preparing photosensitive resin cylinders which-comprises winding a photosensitive resin sheet on and around the surface of a cylinder without any material overlapping of or spaces between the edge portions of the wound resin sheet, and applying to the cylinder under rotation a roll rotating in contact with the surface of the resin sheet while heating so as to join the edge portions of the resin sheet to one another by melting and to make uniform the thickness of the resin sheet.

Abstract: A sensitizing dye and a hydrophilic resin are dissolved in a first solvent, and a second solvent is added to the solution. The second solvent is less volatile than the first solvent, miscible therewith and does not dissolve both of the sensitizing dye and the hydrophilic resin. A powder of the sensitized zinc oxide is incorporated into the solution. After blending, the mixture is dried and pulverized to obtain a powder of sensitized zinc oxide. This powder is then mixed with a bonding agent consisting of a resinous material having an acid value of 5-30 to form a mixture which is formed into a thin photosensitive layer for use in electrophotography.

Abstract: In a process for producing an electrophotographic recording material composed of a double layer of amorphous and crystallized selenium on an electrically conductive carrier, a layer of tellurium having a thickness of 10 to 500 nm is applied onto the surface of the carrier, and selenium is then vapor-deposited onto the tellurium layer to a thickness of 20 to 100.mu. to form the double layer.

Abstract: The present invention provides a photosensitive material for use in electrophotography which is superior in durability, resistance to solvents and light sensitivity, which comprises a photoconductive layer consisting essentially of an inorganic or organic photoconductor and an ionizing radiation-curable resin as formed on a conductive support, said photoconductive layer having been cured by applying said radiation.

Abstract: A migration imaging system including imaging members comprising a substrate overcoated with a softenable layer, and migration marking material, with the softenable layer having a thin surface skin of material having a higher viscosity than the remainder of the softenable material layer.

Abstract: In an electrostatographic recording member comprising at least:an electrically-insulating substrate;an intermediate layer overlying the substrate, the intermediate layer being electrically conductive;an outer layer overlying the intermediate layer, the outer layer comprising a photoconductive material or a dielectric material of high volume resistivity; andmeans for establishing a ground connection to the electrically-conductive intermediate layer;the improvement comprising said ground connection means comprising at least one hole or aperture disposed through the thickness of the recording member from a surface thereof at least to the depth of the conductive intermediate layer and substantially completely filled with an electrically-conductive composition comprising a plastic adhesive and a sufficient amount of an electrically-conducting pigment to make the composition electrically-conductive.

Abstract: A sintered high sensitive electrophotographic plate free of cracks in a photoconductive layer and exfoliation of it from a substrate can be obtained by adding an inorganic material, whose melting or softening temperature is higher than a firing temperature, into a mixture composed essentially of photoconductive material and a glass binder having a softening temperature lower than the firing temperature.

Abstract: Long-life multilayer photoconductive members of the ZnO type are obtained when the successive layers are deposited using solvents, drying temperatures, etc. which do not affect the layers previously deposited. In such fashion, at least 4,000 cycles of use are possible.