Trimer process

Chemistry of inorganic compounds – Phosphorus or compound thereof – Halogen containing

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C01B 2510

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active

046631380

ABSTRACT:
Polymer-grade cyclic phosphonitrilic halide trimer can be obtained by (i) reacting ammonium halide with phosphorus pentahalide in an inert solvent containing pyridine, substituted pyridines or mixtures thereof or hydrogen halide complexes thereof, (ii) washing the solvent phase with an aqueous alkali metal hydroxide and (iii) crystallizing cyclic trimer and/or distilling the cyclic trimer to obtain polymer-grade trimer.

REFERENCES:
patent: 3694171 (1972-09-01), Dreifus
patent: 3952086 (1976-04-01), Fieldhouse
patent: 4175113 (1979-11-01), Fieldhouse
patent: 4567028 (1986-01-01), Tanino et al.
Allcock et al., U.S. patent application Ser. No. 756,799 filed Jul. 19, 1985.

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