POLYIMIDE PREPARATION METHOD CARRIED OUT UNDER PRESSURIZED CONDITIONS

摘要

The present invention relates to a polyimide preparation method comprising the steps of: a) preparing, in a pressure vessel, a dispersion solution prepared by dispersing a dianhydride compound, and a diamine compound, a monomer salt of a dianhydride compound and a diamine compound or a polyamic acid compound in an organic solvent; and b) preparing a polyimide composition by making the inside of the pressure vessel have pressurized conditions and carrying out an imidization reaction. According to the method, since the imidization reaction is carried out under relatively low temperature conditions compared with a conventional technique when preparing a polyimide, the polyimide to be prepared has a wide industrial application range due to being colorless and transparent and has excellent mechanical properties and thermal characteristics due to having a high molecular weight.