Improved procedure for the separation of Polyphenylene oxide from blends of Polyphenylene oxide and catalytic Reaction

摘要

A novel process is disclosed for the removal of catalyst residues from organic solutions of polyphenylene oxides. The process comprises adding a nitrogenous salt of nitrilotriacetic acid to a polyphenylene oxide reaction mixture and thereafter adding an antisolvent for polyphenylene oxide to the mixture to cause the polyphenylene oxide to precipitate.