Polymatech Co., Ltd.

Naoyuki Shimoyama

Masayuki Tobita

Toru Kimura

Shinya Tateda

Tsukasa Ishigaki

Tsunehisa Kimura

Masafumi Yamato

Hisashi Aoki

Natsuko Ishihara

Fumio Saitoh

Takehiko Nunokawa

For a graphite sheet, a peak intensity ratio (P100/002) of a (100) diffraction peak and a (002) diffraction peak by X-ray diffractometry, and a peak intensity ratio (P110/002) of a (110) diffraction peak and a (002) diffraction peak thereby are set at 10 or more. The graphite sheet is manufactured through a step of preparing a polymer liquid which contains a polymer having carbon in its molecular chains and develops optical anisotropy, a step of unidirectionally orienting the molecular chains of the polymer, a step of obtaining a compact from the polymer liquid in the state that the orientation of the molecular chains of the polymer is maintained, and a step of carbonizing and thereafter graphitizing the compact.

Graphite sheet and manufacturing method of the same

The present invention provides an electrolyte membrane formed of an ion conductive composition. Said composition contains a liquid crystalline polymer having an ionic dissociative group. Molecular chains of the liquid crystalline polymer are orientated in a specific direction. The degree of orientation &#x3b1; of the liquid crystalline polymer is in a range of 0.45 or more and less than 1, as defined by equation (1) as follows,Degree of orientation &#x3b1;=(180&#x2212;&#x394;&#x3b2;)/180&#x2003;&#x2003;(1),

Ion conductive polymer electrolyte membrane and production method for the same

A mold product comprising liquid crystal composition for conducting heat. The liquid crystal composition contains liquid crystal polymer having an orientation degree &#x3b1; obtained by equation 1 below:Orientation degree &#x3b1;=(180&#x2212;&#x394;&#x3b2;)/180 equation 1In equation 1, &#x394;&#x3b2; is a half width in the intensity distribution obtained by fixing peak scattering angle in X-ray diffraction measurement and by varying the azimuth angle from 0 to 360 degrees, and orientation degree &#x3b1; is in a range between 0.5 and 1.0.

Heat conducting polymer mold products

A thermally conductive formed article according to the present invention includes a matrix, and short carbon fibers which are present in the matrix. The short carbon fibers are oriented in a fixed direction in the matrix. A ratio I/Ibetween an intensity Iof a diffraction peak ascribable to a (110) surface of carbon and an intensity Iof a diffraction peak ascribable to a (002) surface of carbon, occurring when X-rays are irradiated onto the thermally conductive formed article along the direction of orientation of the short carbon fibers, is 10 or less.

Thermally conductive formed article and method of manufacturing the same

A thermally conductive molded article is produced by molding a conductive composition into a predetermined shape. The composition includes a polymer matrix and carbon powders. The carbon powders are obtained by graphitizing a polymeric material that has an aromatic ring on its main chain by heating. The carbon powders are aligned in a certain direction in the polymer matrix. Thus, the molded article can be produced easily and effectively that has excellent thermal conductivity in a given direction and that is suitable for use as a heat radiator, heat transfer member, or a component thereof in electronic hardware.

Thermally conductive molded article and method of making the same

A thermally conductive polymer molded article formed by molding a thermally conductive composition which comprises a liquid crystalline polymer and thermally conductive filler having magnetic anisotropy, wherein the liquid crystalline polymer and the thermally conductive filler are oriented in a predetermined direction by a magnetic field. The thermally conductive composition contains 100 parts by weight of the liquid crystalline polymer and 5 to 800 parts by weight of the thermally conductive filler having magnetic anisotropy. The thermally conductive filler has a thermal conductivity in at least one direction higher than the thermal conductivity of the liquid crystalline polymer.

Thermally conductive polymer molded article and method for producing the same

A thermal conductive polymer molded article is formed by molding a thermotropic liquid crystalline composition comprised mainly of a thermotropic liquid crystalline polymer, wherein the thermal conductive polymer molded article is formed by applying a magnetic field or an electric field to the thermotropic liquid crystalline composition melted by heating so that the thermal conductive polymer molded article has a first thermal conductivity (&#x3bb;) higher than a second thermal conductivity (&#x3bb;) of a molded article formed by molding the thermotropic liquid crystalline polymer without the application of the field. The thermal conductive polymer molded article preferably has a first thermal conductivity (&#x3bb;) of between 0.7 and 20 W/(m&#xb7;K). Preferably, the thermotropic liquid crystalline polymer comprises at least one polymer selected from (A) a wholly aromatic polyester and (B) a wholly aromatic polyester amide.

Thermal conductive polymer molded article and method for producing the same

Graphitized carbon powder are produced by carbonizing and expanding a pitch by heating to form carbonaceous foam and by graphitizing before pulverizing or graphitizing after pulverizing the carbonaceous foam. The resultant graphitized carbon powders have an interplanar spacing (d002) of graphite planes of less than 0.3370 nm. The powders preferably have an average particle size of from 2 to 200 &mgr;m. A thermally conductive composition includes the graphitized carbon powders in a matrix. The content of the powders is preferably 1 to 800 parts by weight relative to 100 parts by weight of the matrix. Thus, the graphitized carbon powders that have excellent thermal conductivity and a thermally conductive composition including such powders are provided.

Graphitized carbon fiber powder and thermally conductive composition

A thermally conductive polymer composition includes polymer matrix such as thermoplastic resin or thermoplastic elastomer and a graphitized carbon fiber which serves as a thermally conductive filler. The graphitized carbon fiber is made from a mesophase pitch. The mesophase pitch is spun, infusibilized, carbonized, pulverized, and graphitized to form powdery graphitized carbon fibers. Preferably, the graphitized carbon fibers have a diameter of 5-20 &mgr;m, an average particle size of 10-500 &mgr;m, and a density of 2.20-2.26 g/cm . The composition may be molded to form a thermally conductive molded article such as a thermally conductive sheet. The thermally conductive polymer composition and thermally conductive molded article have high thermal conductivity and transfer large amounts of heat from electric or electronic parts.

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Saitama, Japan

Naoyuki Shimoyama