Method for purifying cyclic dichlorophosphazene trimer of catalytic impurities

摘要

Cyclic dichlorophosphazene trimer which is substantially pure except for catalytic impurities is purified by treating the trimer in the liquid phase with P2O5 for 10-30 minutes at a temperature of 120 DEG -170 DEG C. and atmospheric pressure, then subjecting the reaction mix to a single further purification step by sublimation, melt filtration, or distillation. The purified trimer will not polymerize in the absence of added catalyst at 300 DEG C. or below.