Polymerization process of sulphonic monomers
US6555639B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 22, 2001 |
| Grant date | Apr 29, 2003 |
| Priority date | — |
| Expiry date | Jun 22, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F216/1475
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A polymerization process in microemulsion of:(I) one or more fluorinated monomers containing at least one ethylene unsaturation;(II) one or more fluorinated monomers containing sulphonyl groups —SO2F; said process comprising:a) preparation of an aqueous microemulsion, having a pH in the range 4-7, of perfluoropolyethers (PFPEs);b) feeding of the microemulsion to the polymerization reactor, in an amount higher than 18 ml per liter of reaction medium;c) introduction of the monomer (II) in liquid form into the reactor, reactor pressurization with the gaseous monomers (I);d) addition of the initiator, and feeding of the monomers (I) during the polymerization so as to maintain constant the reactor pressure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.