HOLLOW-FIBER MEMBRANE AND PROCESS FOR PRODUCTION THEREOF

摘要

A hollow-fiber membrane which is usable for water treatment and so on and which has high virus removal performance, high pure water permeability, and high physical endurance and chemical endurance. A thermoplastic resin hollow-fiber membrane constituted of both a layer of three-dimensional network structure and a layer of spherical structure which are laminated with each other, characterized in that when the layer of three-dimensional network structure is thicknesswise divided into thin layers of 0.2µm in thickness, the layer of three-dimensional network structure comprises 10 to 200 thin layers having maximum pore diameters of 0.03 to 0.2µm and zero to two thin layers having maximum pore diameters of less than 0.03µm.