FILLED POLYTETRAFLUOROETHYLENE GRANULAR POWDER AND PROCESS FOR THE PRODUCTION THEREOF

摘要

A filled PTFE granular powder which has a high apparent density, a small mean particle diameter and a sharp particle size distribution, is excellent in fluidity, and can give molded articles excellent in tensile strength, elongation and surface roughness; and a process for the production thereof. In granulating a mixture comprising powdery PTFE and a filler by agitation in water, the agitation is conducted in the presence of both an organic liquid forming a liquid-liquid interface with water and a nonionic surfactant to thereby granulate the mixture.