Polypropylene film manufacturing method, metal layer integrated polypropylene film manufacturing method, and film capacitor manufacturing method

摘要

PROBLEM TO BE SOLVED: To provide a polypropylene film having good withstand voltage under high temperature and a method for producing the same. A method for producing a polypropylene film, which comprises a step of melting a polypropylene resin composition containing at least polypropylene resin A and polypropylene resin B at a temperature of 225 to 270 ° C. and a shear rate of 2000s-1 to 15000s-1. The difference MFRA-MFRB between the melt flow rate (MFRA) of the polypropylene resin A and the (MFRB) of the polypropylene resin B is 1.5 g / 10 minutes or more, and the polypropylene resin A in the polypropylene resin composition. A method for producing a polypropylene film, wherein the content is higher than the content of the polypropylene resin B in the polypropylene resin composition. [Selection diagram] None