Polyimide film

Abstract

To provide a flexible metal laminate plate obtained by pasting together an adhesive film, that suppresses the generation of dimensional variation, and a metal foil. (Resolution Means) A polyimide film having a manufacturing film width of 1 m or more; an anisotropy index (AI) expressed by formula 1 of 12 or less across the entire width, when the propagation speed V of an ultrasonic pulse is measured at an orientation angle (θ) of the film of 45° and 135°, based on the machine conveyance direction (MD) of the film; and a thermoplastic polyimide layer with a thickness of 0.5 to 20 μm provided on at least one surface.

Dependencies are inferred from the claim text.