abstract |
The present invention relates to a method for purifying a high-purity paraphenylenediamine having a low metal ion concentration used in a polyimide varnish or a molded product. SOLUTION: In the production of paraphenylenediamine, a method for purifying paraphenylenediamine comprising distilling crude paraphenylenediamine, recrystallizing in a solvent, filtration and drying. Further, the total content of alkali metals is 1 ppm or less. [Selection diagram] None |