Method for removing sodium salts from polyphosphazene polymer so

Details Method for removing sodium salts from polyphosphazene polymer so Method for removing sodium salts from polyphosphazene polymer so

1984-01-20

1984-10-16

Lee, Lester L.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Treating polymer containing material or treating a solid...

528482, 528499, 528502, C08G 7904

Patent

active

044776560

ABSTRACT:
An improved method for removing sodium salts from mixtures of such salts and polyaryloxyphosphazene or polyalkoxyphosphazene or polyalkoxyaryloxyphosphazene polymer solutions is provided. The method involves first treating the mixture with an acid to neutralize any excess alkoxide or aryloxide. Then, water is added to the mixture to extract the sodium salts therefrom resulting in an at least partial separation of the mixture into a polyphosphazene polymer solution phase and a brine phase comprising water and the sodium salts. Following addition of the water to the mixture, a sulfated fatty acid ester of a natural non-petroleum based oil is added to the mixture to effect a more complete separation of the mixture into the polyphosphazene polymer solution phase and the brine phase. The polyphosphazene polymer solution phase is then separated from the brine phase.

REFERENCES:
patent: 2999891 (1961-09-01), Gleason et al.
patent: 3985835 (1976-10-01), Kao
patent: 4124557 (1978-11-01), Dieck et al.
Article Entitled "Fluoralkyl Phosphonitrilates, A New Class of Potential Fire-Resistant Hydraulic Fluids and Lubricants", by Henry Lederle et al., vol. 11, No. 2, Journal of Chemical and Engineering Data, (Apr. 1966).

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