METHOD FOR CONCENTRATING AQUEOUS FLUOROPOLYMER DISPERSION

摘要

A method for concentrating an aqueous dispersion of a fluoropolymer including one which is capable of easily forming fibers, such as PTFE, with a low energy consumption at a low cost in a short time merely by using a small amount of a surfactant selected from among various kinds thereof. An aqueous fluoropolymer dispersion containing 2.0 to 8.0 % by weight, based on the solid content of the fluoropolymer, of a surfactant is fed to a microfiltration film having a pore size of 0.01 to 1 mu m through feeding means substantially free from shearing force to remove the aqueous medium containing the surfactant from the aqueous dispersion.