Patent ID: 7112648

Claim:
A polyimide film with a tear propagation resistance variation of not more than 1.0 g, comprising not less than 25 mol % of paraphenylene diamine and not less than 25 mol % of 4,4-diaminodiphenylether, both as diamine components, with respect to a total diamine component said polyimide film comprising a repeating unit of formula (1) below in its molecules where R is and where n of the group R is an integer of 1 to 3, X and Y are independently a hydrogen, a halogen, a carboxyl group, a lower alkyl group with no greater than 6 carbon atoms, or a lower alkoxy group with no greater than 6 carbon atoms, and A is —O—, —S—, —CO—, —SO 2 —, or —CH 2 —, and where R 1 is selected from the group consisting of where R 2 in formula (3) is a divalent organic group that is selected from the group consisting of where R 3 is independently —CH 3 , —Cl, —Br, —F, or —CH 3 O.