Biaxially-oriented polypropylene film for capacitor metal deposition film thereof and cast raw sheet

摘要

An ultra-thin biaxially stretched polypropylene film for capacitors having a high withstand voltage at a high temperature and excellent suitability for winding and processing a capacitor, a metal evaporated film for a capacitor using the same, and a cast original sheet for obtaining the same. (A) having molecular characteristics in which the meso pentad fraction ([mmmm]), which is the stereoregularity, determined by high temperature nuclear magnetic resonance (high temperature NMR) measurement is 97% or more and 98% or less, is preferably added to the main isotactic polypropylene resin Of the isotropic polypropylene resin (B) having molecular characteristics of not less than 92% and not more than 95% in a range of not less than 1% by mass and not more than 20% by mass with respect to the total mass of the resin mixture A biaxially stretched polypropylene film made of a mixture of isotactic polypropylene resins having at least two kinds of stereoregularity at least two kinds of polypropylene resin films having a temperature-loss obtained by a solid dynamic viscoelasticity measurement at a heating rate of 2 / min and a frequency of 0.5 Hz A biaxially stretched polypropylene film for a capacitor characterized in that, in a tangent (tan delta) curve, the temperature of the dispersion (crystal dispersion) peak of tan ;