Fuji Photo Film Company, Limited

Xerox Corporation

Rank Xerox Ltd.

Mitsubishi Gas Chemical Company, Inc.

Chugoku Marine Paints, Ltd.

Satoru Honjo

Yasuo Tamai

Seiji Matsumoto

Hajime Miyatuka

Masamichi Sato

Sadao Osawa

Masaaki Takimoto

Masakazu Iwasa

Kenichi Sawada

Seiichi Taguchi

Takashi Saida

Osamu Fukushima

Hideo Sato

Shuichi Ohtsuka

Kazuo Horikawa

Masato Satomura

Nobuo Tsuji

Makoto Nagao

Syunichi Kondo

Akira Umehara

Keishiro Kido

Takao Komaki

Eiichi Mizuki

Naomitsu Takashina

Chiaki Osada

Yasuaki Yuyama

Hisashi Katou

Hajime Miyatsuka

Takuji Kaneda

Wakio Nagashima

Teruo Iida

Masaki Fukagawa

Kazuo Imanishi

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.

Polymeric photoconductive sensitized by

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.

Transfer powder marking method using a core-shell powder comprising a

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.2, is peeled off said photosensitive material one minute after the contact-bonding at a peeling rate of 500 mm/min and an angle of 180 degrees, the toner image carried away by adhering to the tape is not more than 30 wt. % of the toner in the solid image area on which at least 0.03 mg/cm.sup.2 of the toner is deposited, and the cohesion of toner particles inside the toner layer against the peeling force is at least about 350 g/10 mm wide portion.

Process for forming a lithographic printing plate by electrophotography

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.

Method of forming electrostatic image

A powder marking agent comprising a fine powder which comprises, on a total volume basis,

Powder marking agent and marking method

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.

Electrophotographic marking apparatus

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.

Electrophotographic photosensitive layer and marking method

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.

Process for producing an electrophotographic material in which a

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.

Method and apparatus for fixing toner images

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. In this method, the ratio of the thickness of the electrostatic recording layer to the specific dielectric constant is selected to be not larger than 1.5[.mu.m] when the image is of reflection type and not larger than 1.0[.mu.m] when it is of transmission type.

Electrostatic recording process and ionizing radiation image recording

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.

Liquid developer for electrophotography

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.

Recording material

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.

Image recording method

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.

Method for machining metal work

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

Growing community of inventors

Asaka, Japan

Satoru Honjo