| abstract |
(57) [Abstract] [Problem] High crystallinity, excellent heat resistance, solvent resistance, etc. Provided are a polyimide having good melt moldability, and a novel polyamic acid which is a precursor of the polyimide. A polyamic acid is composed of repeating units represented by the following formula and has a logarithmic viscosity [ηinh] (N-methylpyrrolidone solvent, 30 ° C., 0.5 g / dl) of 0.1 to 5 dl. / G. A typical polyimide is formed by dehydration ring closure of the polyamic acid. Embedded image (In the formula, R is the formula: It is the basis of ) |