OIL-REPELLENT WATERPROOF AIR-PERMEABLE FILTER AND METHOD FOR PRODUCING SAME

摘要

Provided are: an oil-repellent waterproof air-permeable filter which has small environmental load, while exhibiting excellent liquid repellency with respect to ketone solvents and ester solvents; and a method for producing the oil-repellent waterproof air-permeable filter. The oil-repellent waterproof air-permeable filter is obtained by covering a base that has a continuous porous structure with a covering material that contains a fluorine-containing polymer that has a perfluoroalkyl group. The fluorine-containing polymer has a constituent unit which is based on an acrylate that has a chlorine atom in the a-position and that has a perfluoroalkyl group having 1-6 carbon atoms, and the ratio of the constituent unit relative to the total constituent units is 40-100% by mass. In the method for producing the oil-repellent waterproof air-permeable filter, the base is treated with an oil-repellent waterproofing agent composition that contains the covering material and a medium, and then the medium is removed.