| abstract |
[PROBLEMS] To provide a simple method for producing polyhydroxyimide. [Measures] In formula (1) (wherein X represents a tetravalent aliphatic group or an aromatic group, Y represents an organic group including an aromatic group substituted with at least one OH group, and n represents an integer of 1 or more). At least one kind of formula (2) or formula (3) (wherein R 1 to R 4 or R 5 to R 8 are each independently a hydrogen atom or a polyhydroxyimide precursor having a repeating structure represented). The weight average molecular weight by polystyrene conversion of gel permeation chromatography (GPC) is 5,000 to 100,000 by adding the compound represented by monovalent organic group, etc., and m represents a natural number, and heating it to the temperature of 50 degreeC or more. A method for producing a polyhydroxyimide, characterized by obtaining a phosphorus polyimide. |