Process for the production of phosphazene polymers

Details Process for the production of phosphazene polymers Process for the production of phosphazene polymers

1977-10-25

1978-12-05

Briggs, Sr., Wilbert J.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528399, 528400, 528490, C08G 7300, C08J 300

Patent

active

041287100

ABSTRACT:
The production of phosphazene polymers represented by the general formula ##STR1## WHEREIN R and R' are organic radicals hereinafter defined, and wherein n is an integer from 20 to upwards of 50,000 wherein one or more kinds of OR or OR' groups is attached to the phosphorus atoms in a substantially linear chain of alternating P and N atoms, the groups when more than one group is present being randomly distributed along the PN backbone, as described in copending United States Patent Application Ser. No. 824,004 filed Aug. 12, 1977, is enhanced by an improved procedure for the separation of the sodium chloride by-product from the derivatized phosphazene polymer. By treating the reaction mixture with carbon dioxide, in the presence of water and preferably with an additional alkali metal salt, agglomeration of the sodium chloride is accomplished, and a clean separation of the NaCl from the polyphosphazene ester is more readily achieved.

REFERENCES:
patent: 3271330 (1966-09-01), Evans
patent: 4073824 (1978-02-01), Dieck et al.

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