| abstract |
The present invention provides aqueous emulsion polymerization of fluorinated monomers, including gaseous fluorinated monomers, using a perfluoroether surfactant as an emulsifier. Perfluoroether surfactants have the formula (I) R f -O-CF 2 CF 2 -X (I) Wherein R f represents a linear or branched perfluoroalkyl group having 1, 2, 3, or 4 carbon atoms, and X represents a carboxylic acid group or a salt thereof. The In other aspects, the present invention also provides aqueous fluoropolymer dispersions containing perfluoroether surfactants and the use of such dispersions in coating or impregnating substrates. |