Chemistry of inorganic compounds – Phosphorus or compound thereof – Halogen containing
Patent
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:
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Lund et al., J. Chem. Soc. (1960), 2542-2547.
Doll John
Ethyl Corporation
Johnson Donald L.
Langel Wayne A.
Odenweller Joseph D.
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