| abstract |
[PROBLEMS] To provide a simple method for producing polyhydroxyimide. (1) wherein X represents a tetravalent aliphatic group or aromatic group, Y represents an organic group containing an aromatic group substituted with at least one OH group, and n represents an integer of 1 or more (2) or (3): wherein R 1 to R 4 or R 5 to R 8 are each independently a hydrogen atom or an alkyl group or a cycloalkyl group, Monovalent organic group and the like, and m represents a natural number), and heating at a temperature of 50 占 폚 or higher, a weight average molecular weight in terms of polystyrene of gel permeation chromatography (GPC) of 5,000 to 100,000 To obtain a polyimide which is a polyimide precursor. |