Sharp Kabushiki Kaisha Corporation

Kaneka Corporation

Satoshi Katayama

Yasushi Nishikawa

Yusuke Ohta

Hiroshi Sugimura

Takashi Inada

Kazushige Morita

Makoto Kutsumizu

Yoshihide Shimoda

Tomoko Kanazawa

Eiji Imada

Shuhei Tsuchimoto

Kiyofumi Morimoto

Kazuhiro Emoto

Satoshi Nishigaki

Yoshimi Kojima

Akihiko Kawahara

Tatsuhiro Morita

Makoto Kurokawa

Takahiro Teramoto

Tadashi Nakamura

Yoshimasa Fujita

Mikio Kakui

Koichi Toriyama

Kazuya Ishida

Kotaro Fukushima

Junichi Washo

Masayuki Sakamoto

Satoshi Machino

Mami Adachi

Kohichi Toriyama

Sayaka Fujita

Hiroko Ishibashi

Tomomi Nakamura

Naoshi Marutani

Jun Sugita

Keisuke Inaba

Motoaki Kobayashi

Kimiko Nishi

A graphite film has a higher degree of thermal diffusion property in one in-plane direction and a method produces the graphite film. The graphite film includes a first axial direction, which is a direction having the highest thermal diffusivity in a film surface, and a second axial direction orthogonal to the first axial direction in the film surface. A value obtained by dividing the thermal diffusivity in the first axial direction by a thermal diffusivity in the second axial direction is not less than 1.020 and not more than 1.300.

Graphite film and manufacturing method thereof

A rolled graphite sheet includes a rod-shaped body and a graphite sheet having a length of 1 m or more and a width shorter than the length. The graphite sheet is wound around the rod-shaped body and is rolled in a length direction. When a length direction-end of the graphite sheet is pulled with a force of 1.5 N/cm in a direction parallel to a tangent of a cross-sectional circle of the rolled graphite sheet while fixing the rod-shaped body, the end moves 5 mm or less in the direction parallel to the tangent of the circle.

Rolled graphite sheet

It is possible to obtain a graphite film with its shape controlled, by performing a sag controlling step of controlling temperatures of a polymer film at both widthwise ends and a temperature of the polymer film in a widthwise middle portion within a temperature range from a starting temperature of thermal decomposition of the polymer film to a sag controlling temperature of the polymer film.

Graphite film and method for producing graphite film

In order to prevent positional displacement of a graphite sheet laminate during production of a resin molded product obtained by integrally molding the graphite sheet laminate and a resin, the present invention uses a graphite sheet laminate having a structure in which a first fixing layer having a modulus of elasticity of not less than 7.0&#xd7;10Pa and not more than 5.0&#xd7;10Pa at 250&#xb0; C. is in contact with a graphite sheet on at least one of principal surfaces of the graphite sheet.

Method for producing resin molded body and graphite sheet laminate

There has been a problem that wrinkles easily occur on a carbonaceous film produced by the use of a continuous production method and on a graphite film obtained by heat-treating the carbonaceous film. In the present invention, heating treatment is carried out on a polymeric film while applying pressure to the polymeric film in the film thickness direction with the use of a continuous carbonization apparatus. This makes it possible to obtain a carbonaceous film and a graphite film in which wrinkling is reduced.

Method for manufacturing carbonaceous film and method for manufacturing graphite film

Graphite film

There is provided a graphite composite film including a graphite film and a metal layer formed on a surface of the graphite film, in which peeling-off of the metal layer from the graphite film is suppressed. More specifically, the graphite composite film includes a graphite film and a metal layer formed on at least one side of the graphite film, wherein the graphite film has a plurality of through holes formed therein, a metal layer is formed also inside the through holes so as to be connected to the metal layer formed on a surface of the graphite film, the metal layer inside the through holes is formed continuously from the one side to an opposite side of the graphite film, and a distance between outer diameters of the through holes is 0.6 mm or less and a ratio of an area of metal inside the through holes to an area of the graphite composite film is 1.4% or more.

Graphite composite film

A re-forming process is carried out in which a material graphite film is heat-treated to not less than 2000&#xb0; C. while the material graphite film is being pressured. Through the re-forming process, sag of a graphite film is controlled. By using, during the re-forming process, a plurality of inner cores having respective different surface states, it is possible to produce a graphite film having two or more sag forms which have respective effects.

A coating liquid for an undercoat layer of an electrophotographic photoreceptor which is formed by sequentially stacking the undercoat layer and a photosensitive layer on an electrically conductive support, wherein the coating liquid comprises titanium oxide microparticles and silicon nitride microparticles as an inorganic compound, a binder resin and an organic solvent.

Electrophotographic photoreceptor, coating liquid for undercoat layer of electrophotographic photoreceptor, and method for producing the same

A photoreceptor comprising an undercoat layer between a conductive support and a photosensitive layer, wherein the undercoat layer contains at least metal oxide microparticles coated with anhydrous silicon dioxide and a first binder resin, the photosensitive layer is a monolayered photosensitive layer containing at least a charge generation material and a charge transport material or a multilayered photosensitive layer formed of a charge generation layer containing a charge generation material and a charge transport layer containing a charge transport material stacked in this order or in an inverse order, and the charge generation material contains a crystal type oxotitanylphthalocyanine having peaks in an X-ray diffraction spectrum with Cu&#x2014;K&#x3b1; characteristic X-rays (0.15418 nm) at Bragg angles (2&#x3b8;&#xb1;0.2&#xb0;) of 7.3&#xb0;, 9.4&#xb0;, 9.6&#xb0;, 11.6&#xb0;, 13.3&#xb0;, 17.9&#xb0;, 24.1&#xb0; and 27.2&#xb0;, in which a peak bundle formed by overlapping the peaks at 9.4&#xb0; and 9.6&#xb0; is a largest peak, and the peak at 27.2&#xb0; is a second largest peak; and an X-type metal-free phthalocyanine having peaks in the X-ray diffraction spectrum at Bragg angles (2&#x3b8;&#xb1;0.2&#xb0;) of 7.5&#xb0;, 9.1&#xb0;, 16.7&#xb0;, 17.3&#xb0; and 22.3&#xb0;.

Electrophotographic photoreceptor and image forming apparatus including the same

An electrophotographic photoreceptor, comprising a conductive support, an undercoat layer and a photosensitive layer formed in sequence, the electrophotographic photoreceptor characterized in that a coating solution for undercoat layer formation for producing the electrophotographic photoreceptor contains at least a binder resin and metal oxide particles surface-treated with anhydrous silicon dioxide.

Electrophotographic photoreceptor and image formation device comprising same

An electrophotographic photoconductor comprising a conductive support, an undercoat layer and a photosensitive layer, the undercoat layer and the photosensitive layer being formed on the conductive support in sequence, wherein the undercoat layer contains a binder resin, titanium oxide particles surface-treated with at least anhydrous silicon dioxide and titanium oxide particles surface-treated with at least hydrous silicon dioxide.

Electrophotographic photoconductor and image forming apparatus including the same, and coating solution for undercoat layer formation in electrophotographic photoconductor

An electrophotographic photoreceptor comprising: a conductive support, a photosensitive layer and an intermediate layer interposed between the conductive support and the photosensitive layer, wherein the intermediate layer contains metal oxide microparticles surface-treated with silicon dioxide anhydride and a binder resin; and the binder resin contains a polyamide resin containing a piperazine-based compound.

Electrophotographic photoreceptor and image forming apparatus provided with the same

The invention provides an electrophotographic photoreceptor, in which suppression of image defects and high sensitivity are compatible, and a method for production thereof. The invention also provides a coating fluid for forming a photosensitive layer and a method for production thereof, as well as an image-forming apparatus using said electrophoto-graphic photoreceptor. Briefly, the electrophoto-graphic photoreceptors may be constructed by forming an undercoating layer on a conductive support, and then forming a photosensitive layer on the undercoating layer. The undercoating layer contains titanium oxide particles in at least either needle shape or dendrite shape. The photosensitive layer contains an electric charge-generating material of which the primary particle size and cohesive particle size are in a range of 0.01 &mgr;m-10 &mgr;m. Accordingly, in the electrophotographic photoreceptors, it is possible to maintain high sensitivity and excellent durability and to form an image with no defect. The photosensitive layer in the electrophotographic photoreceptor has a multilayer structure consisting of a charge-generating layer and a charge-transporting layer. The charge-generating material is a phthalocyanine pigment.

Electrophotographic photoreceptor, process for production thereof, and image-forming apparatus using same

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Settsu, Japan

Satoshi Katayama