Thermally conductive molded article and method of making the same
AssigneePolymatech Co., Ltd.
InventorsMasayuki Tobita, Naoyuki Shimoyama, Shinya Tateda
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Abstract
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.
Claims10
A thermally conductive molded article having the shape of a sheet and produced by molding a conductive composition into a predetermined shape, the composition comprising:
- a polymer matrix;
- and
- carbon powders, wherein the carbon powders are obtained by (1) pulverizing or cutting a polymeric material and then graphitizing the polymeric material or (2) graphitizing a polymeric material via heating and then pulverizing or cutting the graphitized material, the polymeric material having an aromatic ring on its main chain;
- wherein, the carbon powders have a hexagonal graphite crystal structure;
- and the carbon powders and the graphite planes of the hexagonal graphite crystal structure are aligned in the polymer matrix in the direction perpendicular to the molded article sheet.
A method of making a thermally conductive molded article having the shape of a sheet, the method comrising:
- providing a thermally conductive composition including a polymer matrix and carbon powders, wherein the carbon powders are obtained (1) pulverizing or cutting a polymeric material and then graphitizing the polymeric material or (2) graphitizing a polymerte material via heating and then pulverizing or cutting the graphitized material, the polymeric material having an aromatic ring on its main chain;
- applying a magnetic field to the composition so that the carbon powders are aligned in a certain direction in the polymer matrix;
- and
- hardening the composition with the carbon powders aligned in the certain direction;
- wherein the carbon powders have a hexagonal graphite crystal structure;
- and the carbon powders and the graphite planes of the gexagonal graphite crystal structure are alignein the polymer matrix in the direction perpendicular to the molded article sheet.
Dependencies are inferred from the claim text.