Method for purifying cyclic dichlorophosphazene trimer of cataly

Details Method for purifying cyclic dichlorophosphazene trimer of cataly Method for purifying cyclic dichlorophosphazene trimer of cataly

1984-12-17

1985-10-01

Doll, John

Chemistry of inorganic compounds

Phosphorus or compound thereof

Halogen containing

C01B 2510

Patent

active

045445370

ABSTRACT:
Cyclic dichlorophosphazene trimer which is substantially pure except for catalytic impurities is purified by treating the trimer in the liquid phase with P.sub.2 O.sub.5 for 10-30 minutes at a temperature of 120.degree.-170.degree. C. and atmospheric pressure, then subjecting the reaction mix to a single further purification step by sublimation, melt filtration, or distillation. The purified trimer will not polymerize in the absence of added catalyst at 300.degree. C. or below.

REFERENCES:
patent: 3694171 (1972-09-01), Dreifus
patent: 4175113 (1970-11-01), Fieldhouse
patent: 4259305 (1981-03-01), Anderson
patent: 4327063 (1982-04-01), Fieldhouse et al.
patent: 4382914 (1983-05-01), Horie et al.
Colclough, R. O. and Gee, G., Journal of Polymer Science: Part C, _No. 16, pp. 3639-3642, (1968).

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