Method for producing cyclic chlorophosphazene oligomers

Details Method for producing cyclic chlorophosphazene oligomers Method for producing cyclic chlorophosphazene oligomers

2006-08-15

2006-08-15

Langel, Wayne A. (Department: 1754)

Chemistry of inorganic compounds

Phosphorus or compound thereof

Halogen containing

Reexamination Certificate

active

07090813

ABSTRACT:
The present invention provides a method for producing cyclic chlorophosphazene oligomers, in particular the trimer and tetramer, in a high yield and selectivity. The method for producing cyclic chlorophosphazene oligomers involves the reaction between chlorinated phosphorus and ammonium chloride in the presence of a reaction catalyst, wherein 1) moisture is present in the reaction system at a molar fraction of 5×10−3or less based on the total moles of the chlorinated phosphorus added to the reaction system, and 2) the ammonium chloride has an average particle size of 10 μm or less and the value of particle size distribution of 2 or more, estimated by the Rosin-Rammler equation.

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