VINYLIDENE FLUORIDE RESIN FILM, PROCESS FOR PRODUCTION THEREOF AND METALLIZED FILM THEREOF

摘要

A vinylidene fluoride resin film having (1) a crystal melting point of 182 DEG C. or higher as measured by differential scanning calorimeter in nitrogen atmosphere at a temperature elevation speed of 10 DEG C./min; (2) a diffraction point corresponding to (1 1 zeta ) of the alpha -phase crystal in the wide angle X-ray diffraction photograph; and (3) an orientation degree of the crystal of 0.85 or more when measured under irradiation of X-ray incident vertically on a major surface of the film. The vinylidene fluoride resin film is obtained by inflation accompanying melt necking stretching. The film has improved mechanical properties and heat-stability and is also adapted for use as a base film of a metallized film.