Patent ID: 8871894

Claim:
A production method of a polyhydroxyimide, comprising: adding to a polyhydroxyimide precursor containing a repeating structure of Formula (1): (where X is a tetravalent aliphatic group or aromatic group, Y is an organic group containing an aromatic group substituted with at least one OH group, and n is an integer of 1 or more), at least a compound of Formula (2) or Formula (3): (where R 1 to R 3 are independently a hydrogen atom, a C 1-10 alkyl group optionally interrupted with an oxygen atom, a C 1-10 haloalkyl group, a C 1-10 alkoxy group, an aryloxy group optionally substituted with W, a halogen atom, a nitro group, a cyano group, a hydroxy group, a phenyl group optionally substituted with W, a naphthyl group optionally substituted with W, a thienyl group optionally substituted with W, or a furyl group optionally substituted with W, R 4 is a hydrogen atom, a C 1-10 alkyl group, a C 1-10 haloalkyl group, a phenyl group optionally substituted with W, a naphthyl group optionally substituted with W, a thienyl group optionally substituted with W, or a furyl group optionally substituted with W, and W is a C 1-10 alkyl group, a C 1-10 haloalkyl group, a C 1-10 alkoxy group, a hydroxy group, a halogen atom, a nitro group, a formyl group, a cyano group, a carboxy group, a phospho group, or a sulfo group) (where m is a natural number, R 5 to R 8 are independently a hydrogen atom, a C 1-10 alkyl group, a C 1-10 haloalkyl group, a C 1-10 alkoxy group, a halogen atom, a nitro group, a cyano group, a hydroxy group, a phenyl group optionally substituted with W, a naphthyl group optionally substituted with W, a thienyl group optionally substituted with W, or a furyl group optionally substituted with W, and W is a C 1-10 alkyl group, a C 1-40 haloalkyl group, a C 1-10 alkoxy group, a hydroxy group, a halogen atom, a nitro group, a formyl group, a cyano group, a carboxy group, a phospho group, or a sulfa group) or both compounds of Formula (2) and Formula (3) and heating the resultant reaction mixture at a temperature of 50° C. or more to obtain a polyimide containing a repeating structure of Formula (4): (where X, Y, and n are the same as defined above) and having a weight average molecular weight measured by gel permeation chromatography (GPC) in terms of polystyrene of 5,000 to 100,000.