Patent ID: 8338560

Claim:
A polyimide film produced by imidizing polyamic acid produced by reacting aromatic diamine containing 4,4′-diaminodiphenylether, and an aromatic acid dianhydride, said polyimide film satisfies all of the following conditions (A) to (D), (A) an inflexion point of storage modulus ranges from 270° C. to 340° C.; (B) tan δ, which is a value obtained by dividing a loss elastic modulus by a storage modulus, has a peak-top in a range of 320° C. to 410° C.; (C) a storage modulus at 380° C. ranges from 0.4 GPa to 2.0 GPa; and (D) a storage modulus α1 at the inflexion point (GPa) and a storage modulus α2 at 380° C. (GPa) satisfy: 85≧{(α1−α2)/α1}×100≧65, wherein the polyimide film is produced using 4,4′-diaminodiphenylether in an amount of not less than 10 mol % and not more than 50 mol % with respect to an entire diamine component, and wherein measurement for the storage modulus, the inflection point of the storage modulus, the peak top of tan δ, and the storage modulus at 380° C. is carried out at a frequency of 5 Hz.