Abstract: Filler-containing polytetrafluoroethylene granular powder, which has a large apparent density, a small average particle size and a sharp particle size distribution and a superior powder flowability, and gives a molded product having a superior tensile strength, elongation and surface roughness, and a process for preparing the same. The granular powder is prepared by granulation of a mixture of a PTFE powder and a filler in water with stirring in the presence of an organic liquid forming liquid-liquid interface with water and a nonionic surfactant.

Abstract: Filler-containing polytetrafluoroethylene granular powder, which has a large apparent density, a small average particle size and a narrow particle size distribution and a superior powder flowability, and gives a molded product having a superior tensile strength, elongation and surface roughness, and a process for preparing the same. The granular powder is granulated by mixing, in water, of a PTFE powder and a filler in the state of slurry in the presence of a surfactant and stirring in the presence of an organic liquid forming liquid-liquid interface with water.

Abstract: To provide a process capable of preparing a modified PTFE granular powder, in which the ganular powder having excellent handling property, i.e. powder flowability and apparent density is prepared without using a finely pulverized powder and a molded article obtained from the granular powder has excellent physical properties, and a process capable of preparing a modified PTFE granular powder, in which the ganular powder is granulated with only water without using an organic liquid and further a molded article having a break down voltage equal to that in the case of using a finely pulverized powder of unmodified PTFE can be obtained. The granulation is carried out by stirring, in an aqueous medium, a powder of perfluoro(vinyl ether)-modified polytetrafluoroethylene prepared by suspension polymerization and having an average particle size of 100 to 300 .mu.m.

Abstract: To provide a polytetrafluoroethylene granular powder for molding and a process for preparing the granular powder, in which the granular powder contains only a small number of coarse particles, is obtained with good tumbling efficiency and further no organic liquid is required to be used.