Patent ID: 6518352
Filing Date: 2003-02-11
Classification: C08L,C09D

Abstract:
A mixture of fluoropolymer aqueous dispersions, wherein:a) a dispersion is formed of a tetrafluoroethylene (TFE) homopolymer or of a copolymer of TFE and one or more monomers containing at least one ethylenic unsaturation in amounts from 0 up to 8% by weight, the average particle size ranges from 210 to 400 nm; b) a second dispersion is selected from at least one of: 1) a tetrafluoroethylene (TFE) homopolymer dispersion, or a dispersion based on a copolymer of TFE and one or more monomers containing at least one ethylenic unsaturation in an amount from 0 up to 8% by weight; and 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; wherein 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) obtained by microemulsion polymerization.