POLYTETRAFLUOROETHYLENE AQUEOUS DISPERSION COMPOSITION AND METHOD FOR PRODUCING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a method capable of effectively reducing the concentration of a perfluorocarboxylic acid salt-based anion surfactant (hereinafter referred to as APFC) contained in an aqueous dispersion of a polytetrafluoroethylene (hereinafter referred to as PTFE), and to provide a PTFE aqueous dispersion composition obtained by the method. SOLUTION: The method for producing the PTFE aqueous dispersion composition comprises adding an anionic surfactant other than APFC in an amount of 0.1-20 mass% based on mass of PTFE and water in an amount of 10-800 mass% based on mass of PTFE to the PTFE aqueous dispersion obtained by carrying out emulsion polymerization of tetrafluoroethylene in the presence of APFC and precipitating PTFE at pH 5-11 and fractionating a highly concentrated dispersion composition containing PTFE in a high concentration from a supernatant liquid. COPYRIGHT: (C)2005,JPO&NCIPI