| 摘要 |
A thermal diffusion sheet is provided with a heat conducting layer, a thermal diffusion layer provided on the surface of the heat conducting layer and a heat insulating layer provided on the surface of the thermal diffusion layer. The heat conducting layer is formed of a composition containing an organic polymer and a heat conductive filler. The thermal diffusion layer is formed of a metal material. The heat insulating layer is formed of a material having electrical insulation properties. The thermal diffusion sheet is manufactured through providing a heat insulating layer on the surface of a thermal diffusion layer, preparing a composition, and forming a heat conducting layer. When preparing a composition, an organic polymer in liquid form having thermosetting properties and a heat conductive filler are mixed. When forming a heat conducting layer, the above described composition is applied to the surface of the thermal diffusion layer facing the surface on which the heat insulating layer has been provided, and after that, the composition is heated so that the organic polymer is cured.
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