POLYTETRAFLUOROETHYLENE POROUS MEMBRANE, METHOD FOR PRODUCING SAME, AND BREATHABLE MEMBRANE AND BREATHABLE MATERIAL USING SAME

摘要

The present invention involves a polytetrafluoroethylene porous membrane having a surface coated by a liquid repellant. The liquid repellant is a polymer obtained by substantially polymerizing CH2=CHCOOCH2CH2C6F13 alone as a monomer. The polytetrafluoroethylene porous membrane is suitable for breathable membranes that allow gases to pass through while blocking water and/or dust, specifically, a waterproof sound-permeable membrane, a waterproof breathable membrane, and a dustproof breathable membrane, for example.