Oji Holdings Corporation

Shigeo Murase

Masahiro Nakata

Yoshinori Matsuo

Tadakazu Ishiwata

Kazuo Ikeda

Akihiro Kakehi

Yuichi Shishido

Provided is a biaxially stretched polypropylene film for capacitors having a thin thickness and having excellent initial voltage resistance and excellent long-term heat resistance and voltage resistance, and also provided is a metallized polypropylene film for capacitors. The polypropylene film for capacitors is obtained by biaxially stretching a polypropylene resin, the polypropylene film having a crystallite size of 122 &#x212b; or less as determined by the Scherrer's equation from the half width of the reflection peak from (040) plane of &#x3b1;-crystal measured by a wide angle X-ray diffraction method, and the polypropylene film having a value of birefringence &#x394;Nyz with respect to a thickness direction of 7.0&#xd7;10or more and 10.0&#xd7;10or less as measured by an optical birefringence measurement.

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Tokyo, Japan

Shigeo Murase