Biaxially stretched polypropylene film for capacitors, metallized film, and film capacitor
AssigneeToray Industries, Inc.
InventorsTakanori Nakatsuka, Tetsuya Asano, Masami Sugata
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Abstract
A biaxially stretched polypropylene film for capacitors which has protrusions on both sides and has a thickness (t1[μm]) of 1 μm to 3 μm, wherein Formulae (1) to (4) are satisfied by an A-side as one film surface and a B-side as another film surface: |Pa−Pb|≧200; (1) 0.350≦Pa/SRzA≦0.700; (2) 500 nm≦SRzA≦1,200 nm; (3) 50 nm≦SRzB≦500 nm; (4) wherein, in Formulae (1) to (4), Pa is a number per 0.1 mm2 of protrusions on the A-side, Pb is a number per 0.1 mm2 of protrusions on the B-side, SRzA is a ten-point average roughness of the A-side, and SRzB is a ten-point average roughness of the B-side.
Claims10
A biaxially stretched polypropylene film for capacitors which has protrusions on both sides and has a thickness t1 of 1 μm to 3 μm, wherein Formulae (1) to (5) are satisfied by an A-side corresponding to one surface of the film and a B-side corresponding to another surface of the film:
- |Pa−Pb|≧276;
- (1)
- 0.350≦Pa/SRzA≦0.700;
- (2)
- 500 nm≦SRzA≦1,200 nm;
- (3)
- 50 nm≦SRzB≦500 nm;
- (4)
- 456 nm≦(SRzA−SRzB)≦694 nm;
- (5)
- wherein, in Formulae (1) to (5), Pa is a number per 0.1mm2 of protrusions on the A-side, Pb is a number per 0.1mm2 of protrusions on the B-side, SRzA is a ten-point average roughness of the A-side, and SRzB is a ten-point average roughness of the B-side.
Dependencies are inferred from the claim text.