Patent ID: 7419722

Claim:
A heat-radiating sheet for use with an exothermic body, the heat-radiating sheet comprising: a graphite sheet provided on the exothermic body; an electrically insulating elastic layer provided on a surface of said graphite sheet in opposition to the exothermic body; and a barrier layer provided between the graphite sheet and the elastic layer, wherein; the graphite sheet has an average thickness of 300 μm or less; the elastic layer is formed from an elastic composition containing a polymer matrix and a particulate heat-conducting filler; the elastic layer has an average thickness of 10 to 280 μm; the heat-conducting filler has an average particle diameter of 50% or less of the average thickness of the elastic layer; the elastic composition has a heat-conducting filler content of 30% by volume or more, and the elastic composition has a heat-conducting filler content of less than 15% by volume when the average particle diameter of the heat-conducting filler is 95% or more of the average thickness of the elastic layer; and the barrier layer inhibits movement of the polymer matrix towards the graphite sheet within the elastic layer.