Abstract: An organic electroluminescent element contains a positive electrode, a negative electrode, and a thin organic layer arranged between the positive electrode and the negative electrode, wherein the thin organic layer comprises, as a luminescent material, a peropyrene compound represented by following Structural Formuala (1): wherein R1, R6, R8 and R13 may be the same as or different from one another and each represent a group represented by following Structural Formula (2); and R2, R3, R4, R5, R7, R9, R10, R11, R12 and R14 each represent hydrogen atom or a substituent: wherein R15 and R16 may be the same as or different from each other and each represent one of hydrogen atom, an alkyl group and an aryl group, where R15 and R16 may be bound to each other directly or indirectly.

Abstract: elementAn organic electroluminescent element of the present invention contains a positive electrode, a negative electrode, and a thin organic layer arranged between the positive electrode and the negative electrode, wherein the thin organic layer comprises, as a luminescent material, a peropyrene compound represented by following Structural wherein R1, R6, R8 and R13 may be the same as or different from one another and each represent a group represented by following Structural Formula (2); and R2, R3, R4, R5, R7, R9, R10, R11, R12 and R14 each represent hydrogen atom or a substituent: wherein R15 and R16 may be the same as or different from each other and each represent one of hydrogen atom, an alkyl group and an aryl group, where R15 and R16 may be bound to each other directly or indirectly.

Abstract: The object of the present invention is to provide an organic EL element which utilizes a novel condensed eight-ring aromatic compound, and has high color purity of red light and excellent light-emitting efficiency, light-emitting luminance and the like. The organic EL element of the present invention has, in between a positive electrode and a negative electrode, an organic thin-film layer including a light-emitting layer. The organic thin-film layer contains the condensed eight-ring aromatic compound which has a number of regions where substituents can be introduced is any of 14, 16 and 18, and the condensed eight-ring aromatic compound has a point-symmetrical skeleton.

Abstract: An organic EL element having excellent light-emitting efficiency, light-emitting luminance and color purity of blue light having an organic thin film layer interposed between a positive electrode and a negative electrode, and containing a 1,3,6,8-tetrasubstituted pyrene compound expressed by the following structural formula (1) as a light-emitting material; R1 to R4 may be identical or different, and represent substituent groups expressed by the formula (2), in which R5 to R12 may be identical or different, and represent a hydrogen atom or substituent group.

Abstract: An organic EL element utilizes a dinaphthopyrene compound that has a high color purity of green light, excellent light-emitting efficiency, light-emitting luminance. The organic EL element has, in between a positive electrode and a negative electrode, an organic thin-film layer including a light-emitting layer. The organic thin-film layer contains the dinaphthopyrene compound comprising a structure expressed by the following structural formula: where R1 through R18 may be the same or may be different, and represent hydrogen atoms or substituents. At least one of R1 through R18 preferably is selected from aryl groups, arylamino groups and diarylamino groups.

Abstract: The present invention aims to provide an organic EL element having excellent light-emitting efficiency, emission luminance and color purity of green light.

Abstract: An organic EL element having excellent light-emitting efficiency, light-emitting luminance and color purity of blue light is provided. The organic EL element has an organic thin film layer interposed between a positive electrode and a negative electrode, and contains a 1,3,6,8-tetrasubstituted pyrene compound expressed by the following structural formula (1) as a light-emitting material.

Abstract: Providing an organic EL element utilizing a novel dinaphthopyrene compound, having high color purity of green light, excellent light-emitting efficiency, light-emitting luminance. The organic EL element has, in between a positive electrode and a negative electrode, an organic thin-film layer including a light-emitting layer.

Abstract: The object of the present invention is to provide an organic EL element which utilizes a novel condensed eight-ring aromatic compound, and has high color purity of red light and excellent light-emitting efficiency, light-emitting luminance and the like. The organic EL element of the present invention has, in between a positive electrode and a negative electrode, an organic thin-film layer including a light-emitting layer. The organic thin-film layer contains the condensed eight-ring aromatic compound which has a number of regions where substituents can be introduced is any of 14, 16 and 18, and the condensed eight-ring aromatic compound has a point-symmetrical skeleton.

Abstract: A liquid crystal display device includes a first substrate, a first electrode pattern formed on the first substrate, a first molecular orientation film, formed on the first substrate to cover the first electrode pattern, for orienting liquid crystal molecules. The display device further includes a second substrate formed in a position parallel to and apart from the first substrate, a second electrode pattern formed on a surface of the second substrate facing the first substrate, a second molecular orientation film, formed on the second substrate to cover the second electrode pattern, for orienting the liquid crystal molecules. And the display device further includes a ferroelectric liquid crystal layer filled in a gap between the first molecular orientation film and the second molecular orientation film.

Abstract: An image forming device is provided which can prolong the service life of a fixing roll and provide a good anti-offset property, an image having high surface smoothness and good printing properties.A fixer for electrophotography, wherein an electrostatic latent image is developed, comprises a fluororesin-coated fixing roll (2, 9) for fixing a toner and a mechanism (5, 12, 12a, 12b) for coating a fluorosilicone polymer as a release agent onto the surface of the fixing roll.

Abstract: An imaging device for use in an electrographic imaging process, without a cleaning unit for residual toners, which comprises an image-carrying element, an image exposure means, a developing means, an image transfer means, and a distribution roller means of an elastic and electrically conductive material for uniformly distributing the residual toners over a surface of the image-carrying element and at the same time deelectrifying and recharging the same surface of said element. The imaging device has a simplified and compact structure and does not cause an environmental pollution problem due to the generation of ozone in the device.

Abstract: In a process for preparing an ink for a drop-on-demand type ink jet printer, sonic vibration is applied to the ink which is being prepared or has been prepared so that a gas entrained into the ink by incorporation of a dye therein can be removed. This ink can be stably injected through a recording head, even if the size of the head is made smaller to increase the atomizing frequency, or the recording speed.

Abstract: A magnetic brush developer for electrophotography by the reversal development system where a uniform positive charge is imparted to a photoconductive insulator, the insulator is irradiated with a light image to form an electrostatic latent image and the latent image is developed and visualized by a positively charged toner. The developer comprises a carrier of granulated magnetite particles, the surfaces of which are coated with a thermosetting resin containing a fine fluoropolymer powder and a fine magnetite or carbon black powder dispersed therein. When this developer is used, adhesion of the toner to the sleeve is not only prevented at the initial stage of printing but also after continuous printing, and even if continuous printing does conducted, the charge quantity is not reduce, therefore print quality does not degrade.

Abstract: A flash fixing process characterized by using a powdery developing toner comprising at least 80% by weight of a bisphenol A/epichlorohydrin type epoxy resin or a polyester resin as the binder resin, 1 to 10% by weight of a dye or pigment as the colorant and 1 to 10% by weight of a specific aminium compound.

Abstract: A developing material for electrostatic images comprising (a) carrier particles comprising iron beads coated with a layer of butadiene polymer resin in which Fe.sub.3 O.sub.4 powder is dispersed, the volume ratio of the polymer resin to Fe.sub.3 O.sub.4 is from 1:2 to 4:1, and the butadiene polymer is cured by heating with an organic peroxide of from 0.5 to 5.0 parts by weight, based on the weight of the butadiene polymer, which comprises a homopolymer containing 1,2-polybutadiene units, or a homopolymer or copolymer of cyclized 1,4-cis-polybutadiene and (b) from 1% to 6% by weight, based on the weight of the carrier particles, of toner particles which comprise a bis-phenol A-epichlorohydrin type resin, carbon powder, a nigrosine dye, and either a styrene-n-butyl acrylate copolymer or a montan wax.

Abstract: A storage type liquid crystal composition in which a nematic-cholesteric mesophase transition is utilized and the anisotropy of the dielectric constant is positive and an X-Y dot-matrix-type storage-type liquid-crystal display element comprising the composition. The present liquid crystal composition has low driving voltage and long memory effect. This composition comprises a cyclohexane-type liquid crystal, an azoxy-type liquid crystal, and a compensated cholesteric liquid crystal and/or cholesteryl oleate.

Abstract: A process for preparing a developer for electrostatic images comprising: (1) immersing carrier beads in an organic solution of a resin material comprising a 1,2-butadiene or cyclized cis-1,4-butadiene homopolymer, or a mixture of at least one of the homopolymers and a styrene butadiene copolymer; evaporating the organic solvent of the solution, drying the immersed beads, and curing the resin material by a rotary drying method, to form a resin coating on the carrier beads; (2) blending toner materials at a temperature sufficient to form a toner mass, the toner materials comprising: (a) a binder resin, (b) a colorant, and (c) a charge controlling agent; and (3) pulverizing the blended toner mass to form toner particles and mixing the obtained toner particles with the coated carrier in a predetermined ratio of the total surface area of the carrier to the total projection area of the toner particles.

Abstract: A developer material for electrostatic images comprising a mixture of (1) a coated carrier and (2) a toner.(1) The carrier consists of core beads coated with a coating resin comprising a butadiene homopolymer of a molecular weight of from 10,000 to 100,000, for the butadiene homopolymer is 1,2-polybutadiene and/or cyclized cis-1,4-polybutadiene or a mixture of at least one of these homopolymers and a styrene/butadiene copolymer of a molecular weight of from 10,000 to 100,000, the mixture containing from 7.5 to 100% by weight, based on the weight of the mixture, of butadiene in polymerized form.

Abstract: A process for preparing a developer material for electrostatic images comprising a mixture of (1) a coated carrier and (2) a toner by a rotary drying method.(a) The carrier consists of core beads coated with a coating resin comprising a butadiene homopolymer of a molecular weight of from 10,000 to 100,000, for the butadiene homopolymer is linear 1,2-polybutadiene and/or cyclized as-1,4-polybutadiene or a mixture of at least one these homopolymers and a styrene/butadiene copolymer of a molecular weight of from 10,000 to 100,000, the mixture containing from 7.5 to 100% by weight, based on the weight of the mixture, of butadiene in polymerized form.