US 2019/0315047 A1Published application

Biaxially oriented polypropylene film, metallized film, and capacitor

AssigneeOji Holdings Corporation

InventorsTakeshi TOMINAGA, Michiko SUEYOSHI, Yoshimune OKUYAMA, Yoshikazu FUJISHIRO, Masahiro NAKATA, Tadakazu ISHIWATA

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Abstract

A biaxially oriented polypropylene film containing a polypropylene resin, the film having a thickness of 1.0 to 3.0 μm, and a molecular orientation coefficient ΔNx of 0.013 to 0.016, as calculated according to ΔNx=(ΔNxy+ΔNxz)/2 on the basis of a birefringence value ΔNxy in the slow axis direction with respect to the fast axis direction and a birefringence value ΔNxz in the slow axis direction with respect to the thickness direction, as measured via optical birefringence measurement.

Claims7

Dependent claims

A biaxially stretched polypropylene film comprising a polypropylene resin, the biaxially stretched polypropylene film having a thickness of 1.0 to 3.0 μm and having a molecular orientation coefficient ΔNx of 0.013 to 0.016, as calculated according to formula (1):

[Formula 1]
Molecular orientation coefficient ΔNx=(ΔNxy+ΔNxz)/2 (1)
on a basis of a birefringence value ΔNxy in a slow axis direction with respect to a fast axis direction and a birefringence value ΔNxz in the slow axis direction with respect to a thickness direction, as measured via optical birefringence measurement.

Dependencies are inferred from the claim text.