Method of preparing substantially pure polyhalophenoxyphosphazen

Details Method of preparing substantially pure polyhalophenoxyphosphazen Method of preparing substantially pure polyhalophenoxyphosphazen

1979-04-19

1980-12-30

Woodberry, Edward M.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528399, C08G 7902, C08G 7904, C08G 7914

Patent

active

042424933

ABSTRACT:
A method of producing substantially pure polyhalophenoxyphosphazene homopolymers or copolymers which are free from phenoxy groups formed by reduction of halophenols is provided. The method involves as a first step preparing a substantially pure sodium salt of a halogen-substituted phenol (in the case of homopolymers) or the substantially pure sodium salts of a mixture of a halogen-substituted phenol and an alkyl or alkoxy-substituted phenol, alkanol, or fluoroalkanol (in the case of copolymers) by reacting said halogen-substituted phenol or mixture with sodium hydride. Following this procedure, the resultant sodium salt or salts are reacted with a poly(dichlorophosphazene) of the formula (NPCl.sub.2).sub.n, in which n is from 20 to 50,000, to produce a mixture of polyhalophenoxyphosphazene homopolymer or copolymer and sodium chloride. The sodium chloride is then separated from the mixture to produce a substantially pure polyhalophenoxyphosphazene homopolymer or copolymer which is free from phenoxy groups.

REFERENCES:
patent: 2876247 (1959-03-01), Ratz et al.
patent: 3453235 (1969-07-01), Klender et al.
patent: 3459838 (1969-08-01), Klender et al.
patent: 3883451 (1975-05-01), Reynard et al.
patent: 4128710 (1978-12-01), Fieldhouse et al.

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