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摘要

PROBLEM TO BE SOLVED: To provide a fluorinated vinylidene resin porous film which is excellent in mechanical strength, heat resistance, and chemical resistance, has a large size of pores, is permeable for a large amount of water, has high separative faculty, and excellent in pore formation; and a method for producing the same by using the heat inducible phase separation method.;SOLUTION: The fluorinated vinylidene resin porous film has circular or elliptic micropores having an average pore size of 3μm or more on the film surface, has a permeation velocity for pure water of 30,000 L/m²/hr/98kPa or more, and has a fractionated particle size of 1 μm or more. The porous film is formed by heat inducible phase separation of the fluorinated vinylidene resin in a solvent.;COPYRIGHT: (C)2005,JPO&NCIPI