| 摘要 |
PROBLEM TO BE SOLVED: To provide a polyimide precursor capable of manufacturing a polyimide film colorless and transparent, having a low linear expansion coefficient, and excellent in terms of mechanical properties and heat stability.SOLUTION: The provided polyimide precursor includes, as components derived from acid dianhydrides, a component derived from pyromellitic dianhydride (PMDA) and a component derived from 4,4'-oxydiphthalic dianhydride (ODPA) at a combined ratio of at least 60 mol% with respect to all components derived from acid dianhydrides and includes, as a component derived from a diamine, a component derived from 2,2'-bis(trifluoromethyl)benzidine (TFMB) at a ratio of at least 60 mol% with respect to all diamine components, whereas the ratio of the molar number of the component derived from PMDA with respect to the molar number of the component derived from ODPA (PMDA/OPDA) is 80/20-50/50. |
