POLYIMIDE PRECURSOR FIBRID, POLYIMIDE PAPER, POLYIMIDE COMPOSITE PAPER AND POLYIMIDE COMPOSITE BOARD OBTAINED THEREFROM, AND PROCESS FOR PRODUCING THE FIBRID AND THE PAPER PRODUCTS

摘要

A polyimide precursor fibrid material which comprises a polyimide precursor that forms a polyimide having a property of no thermal melting when subjected to a ring closure reaction and which is substantially free from aprotic polar organic solvents, and polyimide paper, polyimide composite paper and polyimide composite board obtained therefrom. Since the inventive polyimide precursor fibrid material does not contain aprotic polar organic solvents, a polyimide paper product having excellent strength can be obtained from the polyimide precursor fibrid material, and a polyimide composite paper product and a polyimide composite board both consisting of uniformly dispersed components and having excellent strength can be obtained from the polyimide precursor fibrids and other staple fibers.