Articles containing a heat source and a heat spreader

Abstract

This invention is related to articles containing a heat source and a heat spreader to conduct heat from the heat source. The heat spreader comprises a core of one or more drawn UHMWPE sheets. The sheets are planar, i.e., have dimensions in two directions that are considerably greater than that of the third dimension. No solvent is used during the drawing process. The draw ratio is typically 100 to 150. The density of a sheet is less than 0.90 g/cm3. A sheet has good thermal conductivity k∥ the direction of the draw. k∥ is at least 30 W/mK. The thermal conductivity perpendicular to the plane of the sheet k⊥ is greatly reduced. k⊥ is less than. 0.20 W/mK.

Dependencies are inferred from the claim text.