Process for the preparation of linear polychlorophosphazene
US4693876A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 14, 1986 |
| Grant date | Sep 15, 1987 |
| Priority date | — |
| Expiry date | Aug 14, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B21/0986
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for preparing linear polychlorophosphazenes having a terminal --PXCl.sub.2 group, wherein X is O or S, by polycondensation of a monomer of the formula P.sub.2 NXCl.sub.5, by heating to release PXCl.sub.3 and continuing the heating after the evolution of PXCl.sub.3 has stopped. In the process, at least the heat induced polycondensation phase after evolution of PXCl.sub.3 has stopped is carried out in solution in a medium which is a solvent for both the monomer and the polymer and which is inert to the constituents of the polycondensation reaction. The process reduces the amount of cross-linking and produces high molecular weight polymers in a reproducible way.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.