Patent ID: 6197903
Filing Date: 2001-03-06
Classification: C08J

Abstract:
A process for preparing a solution and/or dispersion containing sulphonic (per)fluorinated ionomers having --SO.sub.3 M functional groups, wherein M is selected from H, Li, Na, K or NR.sub.4 wherein R is equal to or different from each other are selected from H, CH.sub.3, C.sub.2 H.sub.5, characterized in that it dissolves the above defined ionomers at a temperature comprised between room temperature and about 150.degree. C., in a monophasic ternary mixture essentially constituted by water in a percentage in the range of 0.1%-50% by weight, by a C.sub.1 -C.sub.4 alcohol in a percentage in the range 50%-99% by weight and by a fluoro(poly)oxyalkylene having one hydrogen atom in at least a fluorinated end group, in a percentage in the range 0.1%-40% by weight; wherein the dispersed polymer particle sizes, determined by dynamic laser light scattering (DLLS), are in the range 30-100 nm.