Patent ID: 7012109

Claim:
Mixtures of fluoropolymer dispersion, wherein: a) a dispersion is formed by tetrafluoroethylene (TFE) homopolymers or by its copolymers with one or more monomers containing at least one unsaturation of ethylene type in amounts from 0 up to 8% by weight the average particle size ranges from 190 to 400 nm; b) another dispersion is selected from one or more of the following: 1) tetrafluoroethylene (TFE) homopolymer dispersion, or based on its copolymer with one or more monomers containing at least one unsaturation of ethylene type in amount from 0 up to 8% by weight; 2) TFE thermoplastic copolymers containing from 7 to 27% by weight of hexafluoropropene; copolymers containing from 0.5 to 18% by weight of one or more perfluoroalkylvinylethers; the average particle size of the b) dispersion ranges from 20 to 60 nm; the ratio between the average particle sizes of the dispersion b) with those of the dispersion a) being less than 0.3, component b) being obtainable by microemulsion polymerization.