| abstract |
An oriented polyester film having a layer containing polyester and filler (P1 layer), wherein the P1 layer satisfies the following (1) and (2), and is excellent in electrical insulation and thermal conductivity Provide film. (1) The filler content of the P1 layer is 10 to 60% by mass with respect to the entire P1 layer. (2) The P1 layer polyester is mainly composed of a polyester mainly composed of an aromatic dicarboxylic acid component and a diol component, and the diol component is a diol (A) having an even number of main chain carbon atoms and a main chain carbon number. Includes both odd diols (B), and the molar ratio (A) / (B) of the diol (A) to the diol (B) is 30/70 to 97/3. [Selection figure] None |