Patent ID: 9044706
Filing Date: 2015-06-02
Classification: B01D,B32B,H05K,Y10T

Abstract:
1. A water-proof air-permeable filter for ensuring ventilation and also preventing entry of water, the water-proof air-permeable filter comprising: a non-porous resin film having formed therein a plurality of through pores extending through the resin film in a thickness direction and each having a size larger than or equal to 0.01 μm and smaller than or equal to 10 μm; a treated layer having hydrophobicity and oil repellency, and formed on at least one of both surfaces in the thickness direction of the resin film such that the treated layer has openings at positions corresponding to the plurality of through pores; and a tape stuck to an edge region of one of both surfaces in the thickness direction of the resin film, with the treated layer being interposed between the resin film and the tape, wherein the tape comprises a base material and an adhesive formed onto both surfaces of the base material, the treated layer coats an inner surface of the through pores so as to form an inner part of the treated layer located inside the through pores, and a material forming the treated layer is different from a material forming the resin film.