WATERPROOF BREATHABLE MEMBRANE, WATERPROOF BREATHABLE COMPONENT PROVIDED WITH SAME, WATERPROOF BREATHABLE STRUCTURE, AND WATERPROOF SOUND-PERMEABLE MEMBRANE

摘要

Provided is a waterproof gas-permeable membrane (1) having higher levels of both gas permeability and waterproofness than conventional ones. The waterproof gas-permeable membrane (1) includes: a non-porous resin film (2) having through holes (21a to 21 g) formed to extend through the thickness of the resin film (2); and a liquid-repellent layer (3) formed on a principal surface of the resin film (2) and having openings (31) positioned in register with the through holes (21a to 21g). The through holes (21a to 21g) extend straight and have a diameter of 15 µm or less. The through holes (21a to 21g) are distributed at a hole density of 1x10 3 holes/cm 2 or more and 1x10 9 holes/cm 2 or less in the resin film (2). The through holes (21a to 21g) extend in oblique directions with respect to a direction perpendicular to the principal surface of the resin film (2). The through holes (21a to 21g) that extend in different oblique directions are present together.