| abstract |
Dispersions comprising at least:n 0.1-30% by weight of a polytetrafluoroethylene or tetrafluoroethylenencopolymers with other ethylenically unsaturatednmonomers; 50-99% by weight of fluorinated liquid; polar solvent (water and/or alcohol) complement to 100; 0.01-5% by weight of surfactant selected from:n (a) nonionic hydrogenated nor (b) fluorinated, having a perfluoropolyether or perfluoroalkylicnchain, both of ionic and non ionic type,nselected from the following classes:n A') mono and dicarboxylic acid salts; B') sulphonic acid salts; C') phosphoric mono and diesters and their mixtures, asnsuch or salified, optionally containing amounts ofntriesters lower than 15% by moles; D') nonionic surfactants formed by fluorinated andnpolyoxyalkylenic chains with a number of oxyalkylenicnrepeating units higher than 6; E') cationic surfactants having one or more fluorinatednhydrophobic chains. |