Abstract: There are described novel yellow compounds which are represented by the formula ##STR1## wherein X is a member selected from the group consisting of ##STR2## The compounds may be used for various applications and preferably are utilized as imaging particles in the photoelectrophoretic imaging method.

Abstract: Photoconductive compositions containing aromatic sulfonyl fluorides are novel compositions which are useful in electrophotographic processes, such as xerography. E.g., an electrostatic copying paper is obtained by coating an electroconductive base paper with a composition comprising poly(N-vinylcarbazole) and 4,4'-biphenyldisulfonyl fluoride.

Abstract: A charge pattern of a single polarity and having at least three different levels of potential is developed in two colors by utilizing relatively negatively charged toner particles of one color and relatively positively charged toner particles of a second color.

Abstract: A xerographic color reproduction imaging system is disclosed. This color system provides at least a two color image with one exposure and avoids the necessity of employing a registration step. A sensitized photoconductive layer is employed which is charged, selectively exposed and developed with a color toner. The photoconductive layer is then recharged and developed with toner of another color.

Abstract: The present invention relates to a hydrophobic overcoat for an electrophotographic element. The overcoat contains a polymeric composition such as a homopolymer, copolymer, or blend thereof and an .alpha.,.beta.-ethylenically unsaturated carboxylic acid or the partial alkyl ester thereof and a relatively large amount of cross-linking agent for said polymeric composition, for example, an imine-terminated cross-linking agent or a melamine-formaldehyde resin.

Abstract: An image recording medium for recording incident radiation to provide a positive transparency is constructed of two electrically conductive composite layers containing photoconductive material between them. One of the conductive layers is opaque and the other is transparent to the incident radiation. A voltage, sufficient to cause holes to be produced in the opaque conductive layer in response to the incident radiation, is applied between the conductive layers. Various systems for controlling the recording process are described.

Abstract: In a process for producingan electrophotographic light-sensitive material having a porous support such as a paper support and at least one film forming resin layer directly coated on the support, the at least one resin layer is processed with a pinhole-filling dispersion comprising a liquid and a finely dispersed substance such as a pigment, a plastic particle or a pigment coated with a plastic therein, whereby the finely dispersed substance fills and seals pinholes in the film forming resin layer.

Abstract: An imaging member comprising a first layer of electrically active charge transport material contained on a supporting substrate, a photoconductive layer overlying said active layer, and a second layer of electrically active charge transport material overlying said photoconductive layer, said photoconductive layer exhibiting the capability of photogeneration of charge carriers and injection of said charge carriers, one of said electrically active layers which comprises an electrically inactive resinous material made electrically active by the addition of certain activating compounds thereto exhibits the capability of facile hole injection and transport and the other electrically active layer exhibits the capability of facile electron injection and transport.

Abstract: An imaging member comprising a first layer of electrically active charge transport material contained on a supporting substrate, a photoconductive layer overlying said active layer, and a second layer of electrically active charge transport material overlying said photoconductive layer, said photoconductive layer exhibiting the capability of photogeneration of charge carriers and injection of said charge carriers, one of said electrically active layers which comprises an electrically inactive resinous material made electrically active by the addition of certain activating compounds thereto exhibits the capability of facile hole injection and transport and the other electrically active layer exhibits the capability of facile electron injection and transport.

Abstract: An imaging system is disclosed wherein unpigmented transparent xerographic toner images are used to make color and full color pictorial transparencies and selected hard copy according to specific toner-tacking methods.

Abstract: A holographic recording medium comprising a conductive substrate, a photoconductive layer and an electrically alterable layer of a linear, low molecular weight hydrocarbon polymer has improved fatigue resistance. An acrylic barrier layer can be interposed between the photoconductive and electrically alterable layers.

Abstract: An imaging method is disclosed comprising providing an imaging member comprising a first layer of softenable material containing migration material overlying a second layer of softenable material which is substantially free of migration material wherein at least one of the layers of softenable material contains a surface skin located at the interface between the layer of softenable material. This member is latently imaged and developed by softening whereby the migration material migrates through the first layer of softenable material and the interface, where the surface skin is located, and in depth in the second layer of softenable material thereby forming an imaged member. Background of the migration material is then removed from the imaged member by splitting the member at the interface thereby obtaining an image with excellent imaging properties.

Abstract: An imaging system comprising an imaging member including a deformable metallic layer arranged between a pair of deformable layers, at least one of which comprises an elastomer material. In operation an electrical field is established across the deformable layers to cause deformation thereof in imagewise configuration. The imaging member may include photoconductive material and may include a pair of electrodes for establishing an electrical field across the deformable layers. In one embodiment the electrodes may comprise an electrical X-Y matrix address system.

Abstract: A roller device and method for maintaining a uniform surface contact along a line of axial trangency with respect to one or more rigid cooperating surfaces having irregularities, the roller device comprising a rigid solid- or cylindrical-type core loosely circumscribed axially with a flexible sleeve, the space between the core and the sleeve being substantially equidistant and filled with a curable plastic foam material to obtain a uniform contact and nip width when in rotational contact with a cooperating surface.

Abstract: In an electrophoretic reproduction process wherein a colored reproduction of an original is obtained by sequentially electrophoretically generating at least two visible monochromatic images, and superimposing said images in registry upon a copy web to form a colored reproduction, an improvement is provided comprising essentially eliminating back migration of marking materials from the copy web to the imaging suspension in the second and subsequent image generating steps by employing, in each instance, marking materials comprising a solvent tackifiable polymer and a colorant and/or a copy web containing a solvent tackifiable polymer, and applying to the copy web at least a partial solvent for said tackifiable polymer in an amount sufficient to render said polymer at least partially tacky before the second and before each subsequent image generating step.

Abstract: Magnetic developer material comprising a carrier which comprises high purity nickel is disclosed. Electrophotographic processes employing said developer are also disclosed.

Abstract: A fracturable manifold image is created in an imaging layer sandwiched between donor and receiver sheets by a conventional manifold imaging process using an imaging electrostatic field of a predetermined voltage. The fracturable manifold image is erased by uniformly applying in the dark a second electrostatic field of the same polarity as the first field but of sufficiently greater strength to cause substantially the entire imaging layer to preferentially adhere to one of the sheets. After the fracturable image has been created, but before erasure, the sandwich can be separated while still under the influence of the first field to provide a positive image on one sheet and a negative image on the other sheet and then reassembled substantially in registration. Subsequent such images can be made and erased provided that the imaging field for each subsequent image has at least the strength of the next previous erasure field.

Abstract: An electrostatic image of graphical information is formed on a surface, for example that of an endless tape, a drum or suitable paper, and then magnetic toner particles are applied to the surface and adhere thereto in correspondence with the electrostatic image. Portions of the same surface, in the case of the tape, or of another surface, when the drum or paper are employed, are magnetized, as determined by the location of the toner prticles, to form a magnetic image corresponding to the electrostatic image. Then the toner medium are transferred by friction to a copy mdium such as ordinary paper, while the magnetic image is retained or stored on the surface. Toner particles then again can be applied to the magnetic image for production of additional copies.

Abstract: A xerographic photoreceptor layer which comprises trigonal selenium particles dispersed in an insulating resin matrix, the trigonal selenium particles being present in an amount from about 1 to 25 percent by volume of the layer, and dispersed in a controlled manner to form a plurality of continuous paths through the thickness of said layer. Methods of making and imaging the photoreceptor layer are also disclosed.

Abstract: An improved electrophotographic process, where the image to be reproduced is transferred onto a photoconductive support as an image of electric charges, in which image of charges is transferred from a photoconductive support in virtual contact with a dielectric support to the dielectric support, the improvement comprising completely discharging the photoconductive support before or at the instant of separation of the dielectric support and photoconductive support. The electrophotographic reproduction apparatus of the present application comprises means for producing an electrostatic image on a dielectric support means to bring said dielectric support into virtual face-to-face contact with a photoconductive support, means to transfer the electrostatic image to the dielectric support from the photoconductive support, and means to completely discharge the photoconductive support subsequent to the transfer of charges but before the separation of the dielectric support and photoconductive support.