Biaxially stretched polypropylene film for capacitors

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United States of America Patent

PATENT NO 9605093
APP PUB NO 20150140266A1
SERIAL NO

14370918

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Abstract

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A biaxially stretched polypropylene film for a capacitor containing an isotactic polypropylene. The weight average molecular weight (Mw) of the isotactic polypropylene as measured by gel permeation chromatography (GPC) is 250,000 to 450,000, the molecular weight distribution Mw/Mn is 7 to 12 and Mz/Mn is 20 to 40, and the value of a difference obtained by subtracting a differential distribution value when the logarithmic molecular weight Log(M)=6 from a differential distribution value when Log(M)=4.5 on a molecular weight distribution curve thereof is 8% to 20%. The ultrathin biaxially stretched polypropylene film for a capacitor has superior heat resistance performance and withstands voltage performance.

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Patent Owner(s)

  • OJI HOLDINGS CORPORATION

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Ishiwata, Tadakazu Chiba, JP 17 36
Shishido, Yuichi Otsu, JP 3 18

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