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The method of preparing hetero-organic phosphonitrile polymers by the interaction of alkoxy-or -chloroalkoxyphosphazenes with hetero-organic compounds containing halogens is distinguished by the fact that hetero- organic compounds containing a halogen in the organic radical are used. This increases the hydrolytic stability of polymers. The general formula for these compounds is given., Edited Trans. of Patent (USSR) 256257 2p 1970, by Rene E. Courville.

The proposed method of synthesizing phosphonitrile chlorides makes possible a sharp increase in the yield of crystalline homologs, with a predominante yield of the trimer. The method consists in reacting phosphorus pentachloride and ammonium chloride in a medium of inert solvents, with organometallic compounds used as catalysts. Organohalides of tin, germanium, and silicon can be used as such catalysts. Thus, in the presence of 0.5 mol.% of dibutyl dichlorostannate the yield of crystalline homologs of phosphonitrile chloride reaches 90%, with the mixture of crystalline products containing no less than 65% of the trimer. (Author), Edited trans. of Patent (USSR) 242 165 2p, 15 Jan 68, by D. Koolbeck.

The synthesis of phosphonitriles is described. Phosphonitrile compounds are reacted with heteroorganic compounds with heating in a molten state or in solvents. To increase the variety of thermally stable and fire-resistant polymers, alkoxyphosphonitrilates or alkoxyphosphonitrilochlorides were used as phosphonitrile compounds, and haloorganic derivatives of silicone, germanium, or tin were used as heteroorganic compounds. (Author), Edited trans. of Patent (USSR) 218 438 p1-2, 20 Jan 67, by D. Koolbeck.