Patent ID: 7662903

Claim:
A thermoplastic imide oligomer obtained by polymerizing an acid component and a diamine component characterized in that at least 30 mol % of the acid component is an aromatic tetracarboxylic acid dianhydride represented by formula (I); or its derivative, and that the terminal of imide oligomer molecule is capped by two or more times of moles of the difference in mole number between the acid component used and the diamine component used, of a dicarboxylic acid anhydride having a triple bond in the molecule represented by formula (IV); in which R′ is a trivalent organic group having 6 to 30 carbon atoms, which is a monocyclic aromatic group, a condensed polycyclic aromatic group or a non-condensed polycyclic aromatic group where aromatic groups are linked each other directly or through a linking member, and any of aromatic ring in formula (IV) may be unsubstituted or substituted.