Patent ID: 8614265

Claim:
Method comprising: (i) providing a fluoropolymer dispersion comprising fluoropolymer particles and one or more fluorinated surfactants selected from fluorinated carboxylic acids or salts thereof having the general formula: [R f —O-L-COO − ] i X i+ (I) wherein L represents a linear fully fluorinated alkylene group, R f represents a linear fully fluorinated aliphatic group or a linear fully fluorinated aliphatic group interrupted with one or two oxygen atoms, X i+ represents a cation having the valence i and i is 1, 2 or 3, wherein the fluorinated carboxylic acids or salts thereof have no more than 3 carbon atoms sequentially bonded; (ii) adding one or more non-fluorinated surfactants selected from anionic and non-ionic surfactants; and (iii) reducing the total amount of said one or more fluorinated surfactants to an amount of not more than 500 ppm based on the total weight of the dispersion while maintaining or increasing the amount of solids in the dispersion.