Phosphonitrilic halide polymers

Details Phosphonitrilic halide polymers Phosphonitrilic halide polymers

1983-04-28

1985-11-05

Doll, John

Chemistry of inorganic compounds

Phosphorus or compound thereof

Halogen containing

C01B 2510

Patent

active

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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