POLYIMIDE FILM

摘要

A polyimide film suitable for use as, e.g., a base film for the TAB technique. The polyimide film is obtained from a polyamic acid solution as a precursor, and is characterized in that the polyamic acid is obtained by (1) forming a block from at least one flexible aromatic diamine (1-a), at least one linear aromatic diamine (1-b), and at least one aromatic acid dianhydride (1-c) and (2) subsequently adding at least one flexible aromatic diamine (2-a) and at least one aromatic acid dianhydride (2-c) so that the molar amount of the diamine ingredients added in all steps is substantially equal to that of the acid dianhydride ingredients added in all steps to thereby form a block.