Patent ID: 11826983

Abstract:
An object of the present invention is to provide a polymer film having a low dielectric loss tangent and a small difference in a linear expansion coefficient from that of a copper foil; and a laminate.The polymer film of an embodiment of the present invention is a polymer film including a liquid crystal polymer, in which a hardness A at a distance of half of a thickness of the polymer film and a hardness B at a distance of 1/10 of the thickness of the polymer film satisfy a relationship of Expression (1A), and in a case where positions at distances of 1/10, 4/10, and 6/10 of the thickness of the polymer film are defined as a position T1, a position T2, and a position T3, respectively; and a region from the one surface to the position T1 is defined as a first surface layer region, and a region from the position T2 to the position T3 is defined as a central region, a void area proportion X in the first surface layer region and a void area proportion Y in the central region satisfy a relationship of Expression (2A). (Hardness A+Hardness B)/2≥0.10 GPa  Expression (1A)Void area proportion Y−Void area proportion X≥0.10%  Expression (2A)