Kaneka Corporation

Kanegafuchi Kagaku Kogyo Kabushiki Kaisha

Nisina Materials Co. Ltd.

Yasushi Nishikawa

Takashi Inada

Yusuke Ohta

Makoto Mishiro

Mutsuaki Murakami

Makoto Kutsumizu

Shuhei Wakahara

Satoshi Katayama

Kiyokazu Akahori

Satoshi Oku

Yusuke Kato

Hisayasu Kaneshiro

Kazuhiro Ono

Masahiro Kojima

Katsunori Yabuta

Koji Sezaki

Naoshi Marutani

Yuta Nishina

Keisuke Inaba

Motoaki Kobayashi

A thin plate-shaped graphite product is produced by applying a current to an electrochemical reaction system including a graphite-containing anode, a cathode optionally containing graphite, and an electrolyte solution containing tetrafluoroboric acid or hexafluorophosphoric acid as an electrolyte. Flaky graphite is produced by subjecting the thin plate-shaped graphite product to delamination.

Method of producing thin plate-shaped graphite product, flaky graphite, and method of producing flaky graphite

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

In order to provide a thermal transport structure excellent in bendability, heat dissipation property, and lightweight property and also a thermal transport structure having a high reliability against vibrations and an excellent heat transport performance, used is a thermal transport structure () including stacked graphite sheets (). This thermal transport structure () includes a fixing portion () in which the stacked graphite sheets () are fixed to each other; and a thermally conductive portion () in which the stacked graphite sheets () are not fixed to each other.

Heat transport structure and manufacturing method thereof

Provided are (i) a heat transport structure which is excellent in heat transfer efficiency and (ii) a method of producing such a heat transport structure. The heat transport structure in accordance with an embodiment of the present invention includes: a first thermally conductive material in which through holes are formed; and second thermally conductive materials which are fitted in the respective through holes in a perpendicular direction which is a direction perpendicular to a surface direction, a thermal conductivity which the first thermally conductive material exhibits in the surface direction being higher than a thermal conductivity which the first thermally conductive material exhibits in the perpendicular direction, each of the second thermally conductive materials being held by an inner surface of a corresponding one of the through holes and having fitting strength of not less than 0.5 N/mm per unit circumference of the corresponding one of the through holes.

Heat transfer structure and manufacturing method therefore

A film includes a film body including graphite, and at least one fragment including graphite and formed on one or more surfaces of the film body. The film has a water contact angle of 50 degrees or greater and a glossiness of 20 or lower.

Graphite film, laminate film, method for producing same, and electrode material

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

When a raw material graphite film bad in flatness is laminated onto another material, creases and other defects may be caused. In particular, when a graphite film having a large area is laminated, defects such as creases may be often caused. In order to solve such defects, a flatness correction treatment step is performed wherein a raw material graphite film is subjected to heat treatment up to 2000&#xb0; C. or higher while a pressure is applied thereto. This flatness correction treatment gives a graphite film good in flatness. Furthermore, when the flatness of the raw material graphite film is corrected by use of a thermal expansion of a core, a graphite film small in sagging can be obtained.

Method for improving the flatness of graphite film, graphite film, and method for producing same

Use of highly oriented graphite including graphite layers placed on top of one another and containing only a small amount of water allows for production of an electronic device that includes, as an element, highly oriented graphite in which no delamination occurs, that is highly reliable in use, and that has a good heat dissipation capability.

Highly oriented graphite

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

Provided is a long and large-area graphite film having improved thermal diffusivity and flex resistance, and accompanied by ameliorated ruffling. According to a method for producing a graphite film, in which graphitization of a heat-treated film consisting of a carbonized polymer film is carried out in a state being wrapped around an internal core, the method being characterized in that a heat treatment is executed by controlling distance(s) between the internal core and the film, and/or between the layers of the film, a graphite film accompanied by significantly ameliorated ruffling can be obtained.

Method for producing graphite film

Graphite film

In order to obtain a graphite film having an excellent thermal diffusivity, a high density, and excellent flatness without flaws, recesses and wrinkles on the surface, the process for producing a graphite film according to the present invention comprises the graphitization step for a raw material film made of a polymer film and/or a carbonized polymer film and/or the post-planar pressurization step for the film in this order to prepare a graphite film, wherein the graphitization step is a step of thermally treating two or more stacked raw material films at a highest temperature of 2,000&#xb0; C. and includes a method of electrically heating the raw material films themselves and/or a method of thermally treating the films while applying pressure to the films planarly, and the post-planar pressurization step includes a method of planarly pressurizing the one raw material film or the multiple stacked raw material films after graphitization by single-plate press or vacuum press.

Process for producing graphite film and graphite film produced thereby

A graphite film showing an extremely low average tearing force is more likely to suffer from various kinds of defects, such as splitting, winding deviation, wrinkling, and poor dimensional accuracy, in a step of producing the graphite film and in a step of processing the graphite film. However, these defects can be prevented by using a graphite film that satisfies the following requirements: 1) having an average tearing force of not more than 0.08 N as determined by Trouser tear method in accordance with JIS K7128; and 2) having sag of not less than 5 mm and not greater than 80 mm as determined by a method of film windability evaluation in accordance with JIS C2151.

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Settsu, Japan

Yasushi Nishikawa