Polycondensation of impure P.sub.2 NOCl.sub.5 into uncrosslinked poly(dichlorophosphazenes) in the presence of PCl.sub.5
US5132389A · kind A · utility
1Cited by
2References
17Claims
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Key dates
| Filing date | Oct 22, 1990 |
| Grant date | Jul 21, 1992 |
| Priority date | — |
| Expiry date | Oct 22, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B21/0986
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The polycondensation disrupting effects of the impurities in an impure N-dichlorophosphoryltrichlorophosphazene, P.sub.2 NOCl.sub.5, or oligomer thereof, are avoided by polycondensing such impure P.sub.2 NOCl.sub.5 into a high molecular weight uncrosslinked poly(dichlorophosphazene) in the presence of an effective impurity-inhibiting, polymerization-controlling amount of phosphorous pentachloride, PCl.sub.5.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.