| abstract |
An object of the present invention is to provide a polyimide material excellent in heat resistance, transmittance, low linear expansion coefficient and retardation. The present invention relates to a polyimide film comprising a tetracarboxylic acid residue and a diamine residue, wherein at least one of the tetracarboxylic acid residue and the diamine residue has a bending portion, a coefficient of linear expansion of 60 ppm / K or less and a retardation of 200 nm or less To a polyimide film. |