Phosphonitrilic halide polymers

Chemistry of inorganic compounds – Phosphorus or compound thereof – Halogen containing

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C01B 2510

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045513171

ABSTRACT:
Halophosphazene polymers such as linear phosphonitrilic chloride polymers are prepared in two stages by (i) heating a nitrogen source (e.g., NH.sub.3 ; NH.sub.4 Cl; etc.) with an excess of a phosphorus source (e.g., PCl.sub.5 ; PCl.sub.3 +Cl.sub.2 ; P+Cl.sub.2 ; etc.) so that hydrogen halide is evolved and halophosphazene is formed, and (ii) heating at least a portion of the halophosphazene with at least a stoichiometric amount (preferably an excess) of a nitrogen source (e.g., NH.sub.3 ; NH.sub.4 Cl; etc.) so that hydrogen halide is evolved and halophosphazene polymer of higher molecular weight is formed. Preferably, a third stage is utilized wherein the resultant halophosphazene polymer is then heated, most preferably in an inert solvent or diluent which enhances the fluidity of the reaction mixture, to increase the molecular weight of the polymer.

REFERENCES:
patent: 2872283 (1959-02-01), Taylor
patent: 3359080 (1967-12-01), Ridgeway et al.
patent: 3443913 (1969-05-01), Bieniek et al.
patent: 3545942 (1970-12-01), Rice et al.
patent: 4374815 (1983-02-01), Li
Lund et al., J. Chem. Soc. (1960), 2542-2547.

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