[EN] METHODS OF MANUFACTURE FOR POLYETHERIMIDE<br/>[FR] PROCÉDÉS DE FABRICATION DE POLYÉTHERIMIDE
申请人:SABIC GLOBAL TECHNOLOGIES BV
公开号:WO2018126001A1
公开(公告)日:2018-07-05
A method of making polyetherimide includes: reacting a diamine having four bonds between the amine groups, 4-halophthalic anhydride and 3-halophthalic anhydride at an imidization reaction temperature and pressure in the presence of a solvent and a polymer additive to produce a mixture including 3,3'-bis(halophthalimide), 3,4'-bis(halophthalimide), 4,4'-bis(halophthalimide), solvent, and the polymer additive wherein the molar ratio of 3-halophthalic anhydride to 4-halophthalic anhydride is 95:05 to 60:40; reacting the mixture with an alkali metal salt of a dihydroxy aromatic compound to produce a polyetherimide having a cyclics content less than 6 weight percent, based on the total weight of the polyetherimide, a glass transition temperature greater than or equal to 220°C, and a weight average molecular weight greater than or equal to 25,000 Daltons; wherein the polymer additive dissolves in the solvent at the imidization reaction temperature and pressure.