Membrane sheet

Abstract

The membrane sheet (2) of the present invention contains a thermoplastic resin other than an acrylic polymer and a plurality of inorganic particles. The thermoplastic resin has a fibrous portion (7) and a non-fibrous portion (8). Among the plurality of inorganic particles, exposed inorganic particles having portions exposed from the thermoplastic resin exist at the periphery of the plurality of voids (5) where the thermoplastic resin is not present. The inorganic particles are functional, and in an observation field magnified 5000 times using a scanning electron microscope, the resin occupancy rate, which is the ratio of the total area of ​​the thermoplastic resin to the area of ​​the observation field, can be more than 0% and less than 80%.

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