Purified Vinylidene fluoride polymer and suspensio polymerization process

摘要

A vinylidene fluoride polymer having good high-temperature coloring resistance is produced through suspension polymerization at 10 - 100 DEG C in a mixture solvent of 100 wt. parts of an aqueous medium and 10 - 50 wt. parts of a halogenated hydrocarbon solvent showing a good dissolving power to both a vinylidene fluoride monomer and a polymerization initiator and represented by a formula of: CX3CX2CHX2, wherein X is a fluorine or chlorine atom, and 7 X's include 4 - 6 fluorine atoms and 1 - 3 chlorine atoms. The vinylidene fluoride polymer is characterized by an elutable total organic carbon content in pure water at 95 DEG C of at most 1.1 mu g/cm<2>.