Patent ID: 7294276
Filing Date: 2007-11-13
Classification: C08F,C08J,Y10S

Abstract:
1. A process to reduce the fluorinated anionic surfactant content in a fluoropolymer dispersion, comprising the following steps: a) adding to the fluoropolymer dispersion an anionic polyelectrolyte having an equivalent weight, defined as molecular weight/number of anionic groups present in the electrolyte, higher than 150, wherein the anionic polyelectrolyte is a polymer having a linear or branched structure with anionic groups distributed along the polymeric chain; b) contacting the dispersion with an anionic exchanger; c) separating the dispersion from the anionic exchanger and recovering the dispersion, wherein the recovered dispersion has a fluorinated anionic surfactant content, defined by the weight of fluoropolymer, lower than 100 ppm.