Polyester film with electrical insulation and heat conduction properties
AssigneeDuPont Teijin Films U.S. Limited Partnership
InventorsAnna Ellett, Marianne Bausch-Koenig
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Abstract
A biaxially stretched thermally conductive and electrically insulating film comprising a polyester forming a matrix and a plurality of anisotropic thermally conductive particles dispersed within the matrix and A process for manufacturing said biaxially stretched polyester film in which the dimension of the anisotropic filler particles with the highest thermal conductivity is oriented out of the film plane, thus conferring on said film improved thermal conductivity properties in the direction perpendicular to the film plane.
Claims14
A biaxially stretched electrically insulating monolayer film exhibiting both electrical insulation and heat conduction properties, said film comprising:
- a polyester forming a matrix;
- a plurality of anisotropic primary filler particles dispersed within the matrix, said particles being selected from the group consisting of boron nitride, aluminum nitride, silicon carbide, silicon nitride, aluminum oxide, gallium nitride, gallium arsenide, gallium phosphide, zinc oxide, indium phosphide, beryllium oxide, magnesium oxide, silicon, and mixtures thereof;
- wherein the film is devoid of any carbon fibers;
- wherein the particles are present in an amount ranging from 1.5 to 5 wt. % based on the total weight of the film, and
- wherein the plane or the principal axis of at least 20% of the primary filler particles forms an angle of from 20° to 90° with respect to the film plane,
- wherein the thermal conductivity of said film in the direction perpendicular to the film plane is at least 0.25 W/m·K.
Dependencies are inferred from the claim text.