Patent ID: 8067475

Claim:
An adhesive sheet, comprising: a cured acrylic polymer, small size dry expanded (DE) microspheres and large size dry expanded (DE) microspheres dispersed and ruptured in the cured acrylic polymer, the small size dry expanded (DE) microspheres having an average particle diameter of about 40 μm and the large size dry expanded (DE) microspheres having an average particle diameter of about 120 μm; hollow parts formed by rupturing the dry expanded (DE) microspheres dispersed in the cured acrylic polymer; and a thermally conductive filler, wherein the small size and large size dry expanded (DE) microspheres, prior to rupturing, range from 0.01 to 0.5 g/cm 3 in density and are contained in an amount of 0.1-10 weight parts based on 100 weight parts of the acrylic polymer, and the adhesive sheet has a thermal conductivity of 0.32˜0.83 W/mK.