Process for preparing filler-containing polytetrafluoroethylene fine powder

摘要

A powder of a polymer of tetrafluoroethylene and a filler which is negatively charged in water is prepared by mixing aqueous dispersions of polymer particles and filler particles. The filler particles have polyvalent cations adsorbed on their surfaces so as to be positively charged. The mixing is conducted in the presence of an anionic surfactant and a water immiscible organic liquid. The product coagulates and can be recovered from the resultant dispersion.