| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a polyimide film having excellent heat resistance, dimensional stability represented by a heat expansion coefficient, flexibility, and high transparency together. <P>SOLUTION: The polyimide film having not less than two polyimide resin layers is a polyimide film which includes at least one layer of the polyimide film of a polyimide resin layer (i) containing not less than 70 mol% of structural units produced from 2,2'-bis(trifluoromethyl)-4,4'-diaminobiphenyl and pyromellitic dianhydride, and at least one layer is a polyimide resin layer (ii) having a low glass transition temperature and has a light transmittance of the polyimide film at a wavelength of 500 nm of not less than 75%, and a heat expansion coefficient of not greater than 30 ppm/K. <P>COPYRIGHT: (C)2013,JPO&INPIT |
