Method for producing cyclic chlorophosphazene oligomers
AssigneeAsaki Kasei Chemicals Corporation
InventorKotaro Kuwata
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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 5×10−3 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 μm or less and the value of particle size distribution of 2 or more, estimated by the Rosin-Rammler equation.
Claims7
A method for producing cyclic chlorophosphazene oligomers, comprising 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 5×10−3 or less based on the total moles of chlorinated phosphorus provided for 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.
Dependencies are inferred from the claim text.