| abstract |
A semi-aromatic polyamide film having a small average linear expansion coefficient in a wide temperature range including a reflow soldering region is provided. A semi-aromatic polyamide film comprising a dicarboxylic acid component mainly composed of terephthalic acid and a diamine component mainly composed of an aliphatic diamine having 9 carbon atoms, in the plane direction of the film A semi-aromatic polyamide film having an average coefficient of linear expansion from 25 ° C. to 250 ° C. of 30 ppm / ° C. or less, and a refractive index in the plane direction of the film of 1.595 to 1.610, the surface of the film A semi-aromatic polyamide film, wherein the difference between the refractive index in the direction and the refractive index in the thickness direction is 0.055 to 0.070. [Selection figure] None |