| abstract |
A polyester film having both excellent thermal conductivity and insulating properties is provided. A polyester film comprising a single layer or multiple layers and stretched at least uniaxially, the polyester film containing 10 to 45% by weight of crystalline silicate particles based on the total weight of the film, The d 50 value of the crystalline silicate particles is 0.1 to 15 μm, and the crystalline silicate particles are kyanite and / or cristobalite, and 50% by weight or more and 75% by mole or more of the polymer component of the polyester film is hot. A polyester film comprising a plastic polyester. [Selection figure] None |