Abstract: A photoconductive composition containing as essential components a photoconductive polymer and 1,4-bis(.beta.-cyano-.beta.-alkoxycarbonylvinyl)benzene represented by the following formula (I) ##STR1## wherein R represents a methyl group, an ethyl group, a propyl group or an isopropyl group, present in an amount of about 0.02 mol to 0.5 mol per mol of a .pi.-electron system-containing constitutional repeating unit present in the photoconductive polymer, and which forms a charge transfer complex with the photoconductive polymer through the .pi.-electron system having optical sensitivities in the ultraviolet to visible regions; and an electrophotographic light-sensitive material incorporating the aforesaid photoconductive composition in a layer on a support having a conductive surface.

Abstract: A method for marking employing a novel marking agent is disclosed wherein the marking agent is composed of a fine powder containing about 30 to 75% by volume of an ingredient which is insoluble in a solvent used to fix the marking agent.

Abstract: A process for preparing a lithographic printing plate from an electrophotographic photosensitive material comprising a photoconductive insulating layer containing photoconductive zinc oxide and a thermoplastic insulating resin disposed on a waterproof support, said method comprising the steps of electrical charging, imagewise exposure, and development of the material in a wet developer having toner particles containing an oleophilic component dispersed in an insulating liquid carrier, thereby providing an oleophilic toner image, and heating the developed photosensitive material under such conditions that when an adhesive tape having a tackiness of 280 to 350 g/10 mm wide portion as measured by the 180.degree. peeling method of JIS C2107 (passed once between pressure rollers at 50 mm/sec) and which has been contact-bonded to the surface of said toner image-bearing photosensitive material by passage between a metal roll and a rubber roll pressed against said roll at a pressure of 6000 g/cm.sup.

Abstract: A control electrode assembly is provided between a corona discharger and an electrostatic recording medium. The control electrode assembly has a pair of conductive electrodes interposing therebetween a insulating layer having a through hole extending from the upper conductive electrode to the lower conductive electrode. Selected one of the conductive electrodes is grounded through a change-over switch, which connects the selected electrode to the ground and disconnects the other non-selected electrode from the ground to electrically open it. Corona ions from the corona discharger charge the electrically opened conductive electrode to establish an electric field within the through hole. The corona ion current passing through the through hole can be modulated by operating the change-over switch to control the direction of the electric field established within the through hole in accordance with an image signal to form an electrostatic image on a recording medium.

Abstract: A powder marking agent comprising a fine powder which comprises, on a total volume basis,(a) about 48% to about 92% of a thermoplastic linear polyester,(b) about 5 to about 30% of a heat-resistant pigment, and(c) about 2 to about 40% of a fluorine-containing polymer,with the total by volume percent of the heat-resistant pigment (b) and the fluorine-containing polymer (c) being about 45% or less and a marking method which comprises applying the powder marking agent described above onto a metal member in a marking pattern.

Abstract: An electrophotographic print marking apparatus for printing markings on rolled steel plates while the steel plates are being fed in a heated condition. A part of an image transfer belt which is brought to a transfer section where the powder image carried by the belt is transferred to the steel plate is made movable up and down by means of a pair of lower rollers. The rollers are moved up and down to bring the part of the belt in the transfer section close the steel plates when the powder image is transferred to the steel plates and to separate the belt far apart from the steel plates when the powder image is not transferred. A tension roller is provided to absorb the change in tension of the transfer belt accompanying the up and down movement of the lower rollers.

Abstract: An electrophotographic photosensitive layer comprising finely divided photoconductive powders and a resin binder comprising a mixture of an acrylic resin and an epoxy ester resin in a ratio by volume of the acrylic resin to the epoxy ester resin of about 10:90 to 70:30; and an electrophotographic marking method suitable for use on substrates subsequently machined comprising electrophotographically marking machining information on a coating film, forming on a support to be machined, of the electrophotographic photosensitive layer as defined above and hardening the coating film.

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: A toner image carried upon a substrate is fixed by placing the toner image in close juxtaposition to an absorbent web carrying a volatile toner solvent. The toner particles are softened and caused to adhere to the substrate by the action of the vapors emanating from said web. In order to protect the environs from the solvent vapors, the web is enclosed within a substantially sealed housing when laden with said solvent.

Abstract: Disclosed is an electrostatic recording method for forming an electrostatic latent image on a dielectric electrostatic recording layer provided on a conductive support. The relationship between the thickness d[.mu.m] and the specific dielectric constant .epsilon..sub.s of the electrostatic recording layer is such that the ratio of d[.mu.m] to .epsilon..sub.s, i.e. d/.epsilon..sub.s [.mu.m], is not larger than 1.65[.mu.m] when the image recorded is of reflection type and not larger than 1.5[.mu.m] when it is of transmission type. The latent image formed on the recording layer is developed by use of electrophotographic liquid developer. Also disclosed is an ionizing radiation image recording method wherein ionizing radiation carrying image information is directed onto a material which generates photoelectrons or a gas which is dissociated upon receipt of the ionizing radiation to an extent corresponding to the intensity of the radiation.

Abstract: Novel liquid developers contain in a carrier liquid a toner produced by graft-copolymerization of an addition-polymerizable monomer represented by the formula: ##STR1## wherein R.sub.1 represents a hydrogen atom or a methyl group and R.sub.2 represents an alkyl group having 6 to 20 carbon atoms, an addition-polymerizable monomer having an alkoxysilane group or a phenoxysilane group, and carbon black. The carrier liquid has a high electric resistance and a low dielectric constant.

Abstract: A recording material which comprises a support which is highly thermally insulating or a support having thereon a highly thermally insulating layer and a heat-sensitive layer which is thermally deformed, foams, colors, discolors, sublimes, evaporates, or becomes transparent, translucent or opaque when exposed to radiation having a high energy density such as a laser beam and an electron beam on the highly thermally insulating support or on the highly thermally insulating layer on the support.

Abstract: An image recording method for imagewise modulated radiation comprising: forming electric latent images of a radiation image on two or more recording surfaces and then forming an edge enhanced first image and a second image non-edge enhanced or edge enhanced to a small degree in comparison with the first image.

Abstract: A process for machining metal work comprising forming a marked-off image from an image-forming material on a surface of a metal work or on a recording layer provided on the surface of the metal work and subsequently machining the metal work by machine cutting and/or oil immersion electrospark machining on the basis of the marked-off image, and including applying a protective resin layer on the image-bearing surface of the metal work prior to any metal machining, the resin layer comprising a mixture of nitrocellulose and a methacrylic polymer in a weight ratio ranging from about 80:20 to 40:60 of the nitrocellulose to the methacrylic polymer and not hindering the viewing of the image, and the methacrylic polymer mainly comprising methyl methacrylate and having a glass transition temperature of higher than about 85.degree. C.

Abstract: Toning an electrophotographic layer by adding materials which bleach at different rates, and thereafter selectively bleaching the materials after development.

Abstract: A manufacturing process for liquid developer intended for developing the electrostatic latent image characterized by polymerizing one or more kinds of addition-polymerizable monomers with a mixture containing pigment and polymerization initiator to thereby obtain a graft polymer of the monomers and the pigments and treating the resultant polymerized product with a polar solvent of 12 or higher in dielectric constant, and then dispersing the component of the resultant product insoluble in the solvent in the carrier liquid of the liquid developer with high electric resistance whereby (a) the electric resistance of the developer, (b) the uniformity of the charge of the toner in the developer, and (c) the length of charge stability are enhanced because of the treating step.

Abstract: A novel photosensitive member is disclosed which is suitable for the formation of images on the exterior surfaces of structures such as buildings and ships which comprises a combination of a substrate member and photosensitive layer with both opaque and adhesive layers to provide for attachment of the member to the surface of the structure as well as the imaging thereof under outdoor conditions.

Abstract: A recording process using at least one organic compound capable of exhibiting two or more different physical forms at the same temperature which may be converted to one another, and irradiating the organic compound with electromagnetic waves, and thereafter, converting in either the irradiated portion of the organic compound or the non-irradiated portion thereof, the physical form in existence before the irradiation with the electromagnetic waves to another physical form.

Abstract: Improved toner particles each comprising an intimate mixture of a photoconductive pigment and an insulating binder capable of transporting charge carriers when the charge carriers are injected therein from the pigment, the proportion of the total volume of the pigment in the toner particle being 2 to 30 volume percent of the toner particle and the insulating binder being substantially transparent to the light in the region of the spectrum to which the pigment is sensitive. The toner particle may have therein a core or cores of a material which is substantially transparent to the light in the spectral-sensitive region of the pigment. The toner particles have improved surface durability and can be used repeatedly.

Abstract: Liquid developer compositions for use in developing a recording surface bearing an electrostatic latent image comprising finely divided colored marking particles substantially homogeneously dispersed in a carrier liquid, the colored marking particles comprising pigment particles substantially completely covered with a positive charge adjusting agent comprising a polymer of alkyl methacrylate-styrene-vinyltriethoxysilane. Imaging processes employing said liquid developer compositions are also disclosed.