| abstract |
Fluoropolymer aqueous dispersions having particles with average diameters from 150 to 400 nm, comprising bifunctional fluorinated surfactants having formula:n nA-R f —B (I)n nwherein:n A and B, equal to or different from each other, are: —(O) p CFX—COOM; M=NH 4 , alkaline metal, H; X=F, CF 3 ; p is an integer equal to 0 or 1; R f is a linear or branched perfluoroalkyl chain, or a (per)fluoropolyether chain such that the number average molecular weight of (I) is in the range 300-1,800. |