Mitsui Toatsu Chemicals, Incorporated

Nubohito Koga

Masahiro Ohta

Shoji Tamai

Shuichi Morikawa

Taizo Nagahiro

A process for the production of polyimide fibers and polyimide fibers obtained by the process. The process includes thermal or chemical imidation of a polyamic acid which has been obtained by reacting a specific diamine and a particular tetracarboxylic dianhydride in the presence of a dicarboxylic anhydride represented by the following formula: ##STR1## wherein Z represents a divalent group selected from the group consisting of monocyclic aromatic groups, fused polycyclic aromatic groups and non-fused polycyclic aromatic groups with aromatic rings bonded together directly or via a crosslinking member.

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Kanagawa, Japan

Nubohito Koga