Patent ID: 7534825
Filing Date: 2009-05-19
Classification: C08F,C08K,C09D

Abstract:
1. Aqueous dispersions of fluorinated polymers, obtained by emulsion polymerization, having a content of fluorinated surfactants lower than 100 ppm referred to the polymer weight and a fluoropolymer concentration from 20 to 75%, referred to the total weight of the dispersion, and having high stability to shear combined with high stability to segregation, said dispersions of fluorinated polymers comprising a nonionic surfactant and one or more anionic surfactants having the following general formula: wherein: Y, Y′ and Y″ are anionic or nonionic groups, with the proviso that at least one of Y, Y′ or Y″ is an anionic group and at least one of the remaining of Y, Y′ or Y″ is selected from the group consisting of: COOR, CONHR, CONH n and n′ equal or different, are zero or 1.