Chemistry of inorganic compounds – Phosphorus or compound thereof – Halogen containing
Patent
1986-04-21
1987-05-05
Doll, John
Chemistry of inorganic compounds
Phosphorus or compound thereof
Halogen containing
C01B 2510
Patent
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.
Adams, Jr. J. Robert
Tedder, Jr. Joseph B.
Doll John
Ethyl Corporation
Johnson Donald L.
Langel Wayne A.
Odenweller J. D.
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