Fluororesin film

Abstract

The present invention relates to a fluororesin film, and particularly to a film having a low coefficient of thermal expansion. The fluororesin film of the present invention is a fluororesin film having polytetrafluoroethylene-derived endothermic peaks in the temperature ranges of 339° C. to 355° C. and 370° C. to 390° C. in a crystal melting curve measured by differential scanning calorimetry (DSC) during heating at a heating rate of 10° C./min, wherein the crystal melting curve has no polytetrafluoroethylene-derived endothermic peak at a temperature lower than 339° C., and the film has film thickness and haze values that are within a quadrilateral region surrounded by straight lines connecting point A (0.01, 10.0), point B (0.25, 50.0), point C (0.25, 99.5), and point D (0.01, 50.0) in x-y orthogonal coordinates wherein the x-axis represents the film thickness and the y-axis represents the haze value measured in accordance with ISO14782.

Dependencies are inferred from the claim text.