Abstract: An electroconductive substrate for an electrically responsive recording material comprising a porous substrate and a layer of at least one cationic or anionic electric conductor, the conductor layer being formed in the porous substrate along the entire thickness direction thereof extending from one surface of the porous substrate to the other surface of the porous substrate, wherein the conductor layer has a multilayer distribution structure comprising (a) a layer of a cationic electroconductive resin distributed predominantly in the one surface portion of the porous substrate, (b) a layer of an anionic electroconductive resin distributed predominantly in the other surface portion of the porous substrate and (c) a layer of a polysalt of the cationic electroconductive resin and the anionic electroconductive resin interposed between both the electroconductive resin layers (a) and (b) in such a positional relationship that the polysalt layer (c) is adjacent to the electroconductive resin layers (a) and (b).

Abstract: A solid conducting agent comprising a finely divided inorganic solid acid and at least 0.5% by weight of a protonically conductive solid adsorbed and supported on the finely divided inorganic solid acid.This solid conducting agent is characterized by much reduced humidity dependency of the electric conductivity, and it has a sufficient electric conductivity even under low humidity conditions. An electro-responsive recording material including a layer of this solid conducting agent does not show a tacking phenomenon even under high humidity conditions.

Abstract: An electric recording material comprising a support and an electrically conductive recording layer formed at least in the surface portion of the substrate, which recording layer is composed of a dispersion of a basic salt of divalent tin or tin (II) hydroxide in an electrically conductive medium, gives an image having high density and contrast at relatively low electric power when applied to an electrolytic recording process utilizing cathodic reduction. This image can be preserved for a long time without discoloration of the background. Especially good results are obtained when a specific polyhydric alcohol is incorporated in the recording layer optionally with a specific organic sulfur compound.

Abstract: A process for radioelectrophotography, which comprises imparting a uniform electrostatic charge to the surface of a recording layer of an image-recording material and containing dispersed therein many cells and/or pores to cause a strong electric charge to act on the gas inside the cells and/or pores, and irradiating the recording layer with radiation carrying image information to imagewise remove the charge on the surface of the recording layer and form an electrostatic latent image.

Abstract: Heat-sensitive recording materials having a recording layer comprising a soluble heat-sensitive organic high molecular weight compound which is folded to show a granular state on a support, and a recording process for obtaining images which comprises imagewise applying heat to the recording layer to insolubilize the high molecular weight compound and removing by dissolving the portion of the recording layer where the high molecular weight compound is not insolubilized.

Abstract: In the electric recording process comprising relatively moving a pair of a recording electrode and a counter electrode and an electrostatic recording material electrically connected between said two electrodes, applying an electric recording signal between said two electrodes to form an electrostatic image on the electrostatic recording material, developing the so formed electrostatic image with a developer and, if desired, fixing the developed image, when a high frequency signal formed by amplifying and modulating an image signal is applied as the electric recording signal and the electrostatic image formed on the electrostatic recording material is developed with an electroconductive powdery developer containing a fine powder of a magnetic material, high quality recorded images free of such troubles as blurring, tailing, fogging and Moire can be obtained even at high recording speeds.

Abstract: In the electrostatic recording process comprising relatively scanning a recording electrode on an electrostatic recording material electrically connected between said recording electrode and a counter electrode, applying a high frequency alternating current or asymmetric alternating current recording signal formed by amplifying and modulating an image signal by a high frequency carrier wave between said two electrodes to form an electrostatic image on the electrostatic recording material, developing the so formed electrostatic image with a developer and, if desired, fixing the developed image, when an electrostatic recording material including an electroconductive substrate having a specific multi-layer distribution structure is used and if a dielectric layer is disposed on this electroconductive substrate in a specific arrangement selected according to the kind of the recording signal to be applied, such problems as blurring, tailing and fogging can be effectively eliminated and recorded images excellent in

Abstract: In the electrostatic recording process comprising relatively scanning a recording electrode on an electrostatic recording material which is electrically connected between said recording electrode and a counter electrode, applying a high frequency alternating current or asymmetric alternating recording signal formed by amplifying and modulating an image signal by a high frequency carrier wave between said two electrodes to form an electrostatic image on the electrostatic recording material, developing the so formed electrostatic image with a developer and, if desired, fixing the developed image, when a specific dielectric layer is selected to the kind of the recording signal and the electrostatic image formed on the dielectric layer is developed with an electroconductive powdery developer containing a fine powder of a magnetic material, high quality recorded images free of such problems as blurring, tailing, fogging and Moire can be obtained a high recording efficiency.

Abstract: Heat-sensitive recording materials having a recording layer comprising a soluble heat-sensitive organic high molecular weight compound which is folded to show a granular state on a support, and a recording process for obtaining images which comprises imagewise applying heat to the recording layer to insolubilize the high molecular weight compound and removing by dissolving the portion of the recording layer where the high molecular weight compound is not insolubilized.

Abstract: A multilayer image-forming material which comprises an organic sulfur compound and a metal capable of interreacting upon irradiation with electromagnetic radiation to form an interreaction product or products (hereinafter product and products will simply termed "product"). When the image-forming material is imagewise irradiated with electromagnetic radiation, an interreaction product of the organic sulfur compound and the metal is formed in the irradiated portions of the material, and the physical, chemical and pysico-chemical properties of the thus formed interreaction product are different from those of the respective organic sulfur compound and metal in the non-irradiated portions. Utilizing this difference in properties, the present image-forming material is useful for various applications.

Abstract: The photosensitivity of organic photoconductive materials can be improved by reactively mixing a free radical former having a free radical produced by irradiation of a dye base compound and an organic photoconductive materials with radiation energy.

Abstract: This apparatus is disclosed for developing electrostatic latent images, comprising a developer supply unit having a first liquid repellent layer with a thickness in the range of 3 - 400.mu.(preferably 5 - 330.mu.). The first layer is disposed on a surface of a substrate, having a plurality of closely spaced pores distributed uniformly over the entire surface of the substrate and penetrating to the back surface thereof. A liquid developer is supplied to a first or back surface of this unit. A photoconductive sensitive plate is spaced closely to a front or second surface of the developer supply unit, to attract the developer to exude through the pores from the first surface of the said liquid repellent layer. More specifically, an electrostatic voltage is applied between the developer supply unit and the photoconductive sensitive plate to provide an electrostatic latent image preformed of electrostatic charges.

Abstract: This apparatus is disclosed for developing electrostatic latent images, comprising a developer supply unit having a first liquid repellent layer with a thickness in the range of 3 - 400.mu. (preferably 5 - 330.mu.). The first layer is disposed on a surface of a substrate, having a plurality of closely spaced pores distributed uniformly over the entire surface of the substrate and penetrating to the back surface thereof. A liquid developer is supplied to a first or back surface of this unit. A photoconductive sensitive plate is spaced closely to a front or second surface of the developer supply unit, to attract the developer to exude through the pores from the first surface of the said liquid repellent layer. More specifically, an electrostatic voltage is applied between the developer supply unit and the photoconductive sensitive plate to provide an electrostatic latent image preformed of electrostatic charges.