Membrane purification of solutions/suspensions of polyphosphazenes
US5098574A · kind A · utility
5Cited by
8References
23Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 13, 1991 |
| Grant date | Mar 24, 1992 |
| Priority date | — |
| Expiry date | Feb 13, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G79/025
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Impure solutions or suspensions of the polyphosphazenes, e.g., those containing the reagents and/or byproducts of the chloro-substitution of a polydichlorophosphazene, are purified by contacting such impure solutions/suspension with a semipermeable membrane having a cutoff threshold corresponding to the impurities sought to be removed, and filtering such impurities therethrough, e.g., by establishing a trans-membrane pressure gradient.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.