Biaxially Stretched Polypropylene Film For Capacitor Metallized Film And Film Capacitor

Abstract: Provided is a biaxially stretched polypropylene film for capacitors which has high withstand voltage characteristics when used as a dielectric for capacitors and which has highly suitable processability into elements. The biaxially stretched polypropylene film for capacitors has projections on both surfaces and has a thickness (t1 µm) of 4 20 µm. When one of the surfaces is expressed by surface A and the other by surface B all of the following relationships are satisfied. 800=SRzB=1 300 (nm) 0.1=SRzA/SRzB=0.8 PBmin=100 (nm) PBmax=1 500 (nm) 0.4=PB450 750/PB=0.7 In the relationships SRzA is the 10 point average roughness of surface A (nm) SRzB is the 10 point average roughness of surface B (nm) PBmin is the minimum projection height of surface B (nm) PBmax is the maximum projection height of surface B (nm) PB450 750 is the total number of projections which are present on surface B and which each have a height of 450 nm or greater but less than 750 nm per 0.1 mm (projections/0.1 mm) and PB is the total number of projections present on surface B per 0.1 mm (projections/0.1 mm).

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