The new high polymer, the thin film formation mannered null expression which uses the said high-molecular precursive body, and the said high-molecular

摘要

Provided are polyimide and a thin film thereof which have a three-dimensional structure and therefore are excellent in a mechanical strength and a heat resistance as compared with those of conventional linear polyimide. The polyimide is obtained from a salt of multifunctional amine represented by Formula (1): (wherein A represents a tetravalent organic group, and n represents an integer of 0 to 3) and tetracarboxylic diester represented by Formula (2): (wherein B represents a tetravalent organic group having 1 to 20 carbon atoms, and RSUB1 /SUBand RSUB2 /SUBeach represent independently an alkyl group having 1 to 5 carbon atoms).