A PROCESS FOR PRODUCING AN AQUEOUS FLUORINATED POLYMER DISPERSION HAVING A REDUCED CONTENT OF FLUORINATED EMULSIFIER

摘要

33 ABSTRACT The present invention provides a process for producing an aqueous fluorinated polymer dispersion having a reduced content of a fluorinated emulsifier by using a weakly basic anion-exchange resin to let it adsorb and remove a fluorinated emulsifier with excellent efficiency from an a^Keous fluorinated polymer dispersion. A process for producing an aqueous fluorinated polymer dispersion having a reduced content of a fluorinated emulsifier, which comprises adding an organic carboxylic acid represented by the following formula 11) : Q(CH2)„(CH(0H))nC00H (1) (wherein Q is H, CH3 or COOH, each of m and n which are independent of each other, is 0 or an integer of from 1 to 4, and 4^n+m^l.) to an aqueous fluorinated polymer dispersion containing a fluorinated emulsifier, followed by contact with a weakly basic anion-exchange resin to adsorb and remove the fluorinated emulsifier.