Aqueous fluorine-containing polymer dispersion

摘要

An aqueous fluoropolymer dispersion having a fluoropolymer content of 20-75 wt.-% and comprising
(i) dispersed fluoropolymer particles having
- an average primary particle diameter of 50-400 nm, and
- a surface layer obtained by emulsion polymerization of a tetrafluoroethylene-containing monomer composition in the presence of a chain transfer agent,
(ii) ‰¤ 50 ppm of a fluorinated surfactant, and
(iii) 2-15 wt.-% of a non-fluorinated nonionic surfactant, based on the weight of the fluoropolymer.