Aromatic polyimides derived from aromatic dianhydrides and chlorinated aromatic diamines

摘要

An aromatic homopolyimide or copolyimide film having low water absorption and high thermal durability comprising an aromatic tetracarboxylic dianhydride component and an aromatic diamine component wherein said aromatic diamine component comprises from 30 to 100 mole%, based on the total molar amount of diamine present, of 2,2'-dichloro-4,4'diaminodiphenylether is described. The film has low water absorption, high elastic modulus and elongation and can e heat-processed without embrittlement.