Process for preparing cyclic phosphonitrilic chloride oligomers

Details Process for preparing cyclic phosphonitrilic chloride oligomers Process for preparing cyclic phosphonitrilic chloride oligomers

C - Chemistry, Metallurgy

01

B

23/77

C01B 21/098 (2006.01)

Patent

CA 1126479

PROCESS FOR PREPARING CYCLIC PHOSPHONITRILIC CHLORIDE OLIGOMERS ABSTRACT: This invention provides a process for preparing cyclic phosphonitrilic chloride oligomers characterized by the combination of: (I) The first step of reacting phosphorus penta- chloride with ammonium chloride in an inert organic solvent in the presence of a catalyst comprising at least one of (a) chlorides of bivalent metals and (b) organic acid salts of bivalent metals, and distilling off the solvent from the resulting reaction mixture to obtain a reaction product consisting essentially of cyclic phosphonitrilic chloride oligomers, and (II) the second step of contacting a solution of the reaction product in at least one solvent selected from the group consisting of aliphatic hydrocarbons and ethers with water at a temperature of about 40 to about 100°C, separating the resulting aqueous layer from the organic layer, and isolating from the organic layer a mixture of cyclic phosphonitrilic chloride oligomers having outstanding polymerization properties and consisting essentially of the trimer and tetramer of the phosphonitrilic chloride.

376744

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