Process for purification of phosphonitrilic chloride polymers

Details Process for purification of phosphonitrilic chloride polymers Process for purification of phosphonitrilic chloride polymers

C - Chemistry, Metallurgy

01

B

23/77, 202/89

C01B 25/00 (2006.01) C01B 21/097 (2006.01) C01B 21/098 (2006.01) C07F 9/6581 (2006.01)

Patent

CA 1052979

Abstract of the Disclosure A method for the selective purification of phosphonitrilic chloride polymer mixtures to obtain substantially pure cyclic trimeric and tetrameric phosphonitrilic chloride polymers by distillation under reduced pressure with inert solvent passed through the molten phosphonitrilic chloride mixture, optionally with prior solvent extraction and/or subsequent recrystallization from solvent. The phosphonitrilic chloride polymers of this invention have utility as high temperature functional fluids, flame retardant additives, polymers and intermediates for such uses.

238077

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