| 摘要 |
PROBLEM TO BE SOLVED: To provide a polyimide material that is excellent in heat resistance, transmittance, low linear expansion coefficient and low retardation.SOLUTION: This invention relates to a polyimide film comprising a tetracarboxylic acid residue and a diamine residue, where at least one of the tetracarboxylic acid residue and diamine residue has a bent site, and the polyimide film has a linear expansion coefficient of 60 ppm/K or less and a retardation of 200 nm or less.SELECTED DRAWING: None |
