film

Abstract

To provide a film whose surface properties such as adhesiveness change in response to humidity. 【Solution means】For at least one surface A, a film that satisfies the following when pressure treatment is performed under the conditions shown below and the surface roughness is measured before and after the treatment. 2 nm ≤ SRa i ≤ 300 nm 1.5 ≤ SRa i / SRa f ≤ 20 Pressure treatment conditions: In an environment of 50°C and 85% RH, the release surface of "Celapill" (registered trademark) WZ type (manufactured by Toray Industries, Inc.) is overlapped with surface A, and it is sandwiched between two 1-mm-thick SUS plates with a mirror finish (#800 polishing), and then pressurized at 0.2 MPa for 5 seconds. SRa i : Center line average roughness measured under the conditions of 23°C and 65% RH before the pressure treatment SRa f : Center line average roughness measured under the conditions of 23°C and 65% RH after the pressure treatment

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