Process for preparing halophosphazene mixtures
US4065546A · kind A · utility
3Cited by
3References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 8, 1975 |
| Grant date | Dec 27, 1977 |
| Priority date | — |
| Expiry date | Dec 8, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B21/097
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Process for the preparation of chlorophosphazene mixtures having a high proportion of cyclic trimer and tetramer by preparing a dispersion of finely divided ammonium chloride in an amount sufficient to initiate the formation of chlorophosphazene, then, after heating the dispersion to reflux, co-feeding ammonia and a solution of phosphorus pentachloride in a suitable solvent at a rate such that no free PCl.sub.5 concentration is allowed to exist in the reaction mass, and then recovering the cyclic chlorophosphazene produced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.