| 摘要 |
Cyclic chlorophosphazene oligomers, in particular the trimer and tetramer are produced in a high yield and selectivity. by reacting chlorinated phosphorus and ammonium chloride in the presence of a catalyst, wherein 1) moisture is present in the reaction system at a molar fraction of 5 Í 10<-3> or 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 žm or less and the value of particle size distribution of 2 or more, estimated by the Rosin-Rammler equation.
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