Oji Holdings Corporation

Akihiro Kakehi

Masahiro Nakata

Tadakazu Ishiwata

Yoshinori Matsuo

Yoshimune Okuyama

Tatsuji Ishida

Kazuo Ikeda

Yoshikazu Fujishiro

Masahiro Yoda

Yuichi Shishido

Takeshi Tominaga

Michiko Sueyoshi

Shigeo Murase

Katsuyuki Moritaka

Kazuyuki Hiate

Takumi Suei

Provided is a technique of obtaining films with higher dielectric breakdown strength at high temperatures and folding resistance. A resin composition comprises (1) a syndiotactic polystyrene resin, (2) a polyphenylene ether resin, and (3) at least one member selected from the group consisting of styrene-based thermoplastic elastomers and atactic polystyrene resins, wherein the content of the polyphenylene ether resin in the resin composition is 6 mass % or more.

Resin composition suitable for use as film for film capacitor

In a metallized film, n electrode portions, which are metal deposition portions, are formed in parallel on one surface of a dielectric filmhaving a film width corresponding to n capacitor elements, n being an even number of 2 or more. Each electrode portionis provided with a plurality of inclined marginsand, which are metal non-deposition portions extending at an angle with respect to a film width direction, at a regular interval in a film length direction. Across a center line Lc virtually extending in the film length direction at the center in the film width direction, the inclined marginsof the electrode portionlocated on one side in the film width direction, and the inclined marginsof the electrode portionlocated on the other side in the film width direction are inclined in opposite directions so as to be line-symmetric with respect to the center line Lc.

Metallized film, metallized film roll, plate roll

A polypropylene film which has a crystallite size of not more than 12.2 nm, the crystallite size being determined using Scherrer's equation from a full width at half maximum of the reflection peak from (040) plane of &#x3b1; crystal measured by a wide-angle X-ray diffraction method, and a volume resistivity of not lower than 6&#xd7;10&#x3a9;&#xb7;cm, the volume resistivity being calculated in accordance with equation I from a current value that is measured 1 minute after applying a voltage at a potential gradient of 200 V/&#x3bc;m in an environment at 100&#xb0; C. Equation I: volume resistivity=[(effective electrode area)&#xd7;(applied voltage)]/[(polypropylene film thickness)&#xd7;(current value)].

Polypropylene film, metal layer-integrated polypropylene film, and film capacitor

The present invention relates to a biaxially stretched polypropylene film for capacitor. The biaxially stretched polypropylene film for capacitor of the present invention can suppress an increase in tan &#x3b4; and a decrease in the electrostatic capacitance even when the capacitor is used at a high voltage and an elevated temperature for a long duration.

Biaxially stretched polypropylene film for capacitors, metallized film, and capacitor

A film for a capacitor having a plurality of layers, the film for capacitors satisfying the following relational expression (1): Cmo/Cmu&#x2265;1.1 wherein Cmu is an oxygen gas permeability coefficient of the film for the capacitor, and Cmo is an oxygen gas permeability coefficient of an equivalent film that would be obtained if the film for the capacitor were to be formed as a uniform single layer, and having a thickness of 1 to 35 &#x3bc;m.

Film for capacitor and process for producing same

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.

Biaxially stretched polypropylene film for capacitor

The present invention addresses the problem of providing a biaxially stretched polypropylene film for capacitors, which has high voltage resistance and excellent breakdown properties. The present invention also addresses the problem of providing a biaxially stretched polypropylene film for capacitors, which can be used suitably in a high-capacity capacitor to which a high voltage is to be applied under a higher temperature, and which preferably has a small thickness. The present invention relates to a biaxially stretched polypropylene film for capacitors, wherein a polypropylene resin which constitutes the polypropylene film has a number average molecular weight of 40,000 to 100,000 inclusive and a Z average molecular weight of 950,000 to 1,500,000 includes wherein, in a molecular weight distribution curve, the value of the difference obtained by subtracting a differential distribution value at a logarithmic molecular weight Log (M) of 6.0 from a differential distribution value at a logarithmic molecular weight Log (M) of 4.5 is &#x2212;15 to 11% inclusive.

Biaxially stretched polypropylene film for capacitors

The present invention addresses the problem of providing a biaxially stretched polypropylene film for capacitors, which has high voltage resistance and excellent breakdown properties. The present invention also addresses the problem of providing a biaxially stretched polypropylene film for capacitors, which can be used suitably in a high-capacity capacitor to which a high voltage is to be applied under a higher temperature, and which preferably has a small thickness. The present invention relates to a bi-axially stretched polypropylene film for capacitors, wherein a polypropylene resin which constitutes the polypropylene film has a number average molecular weight of 40,000 to 100,000 inclusive and a Z average molecular weight of 950,000 to 1,500,000 inclusive, wherein, in a molecular weight distribution curve, the value of the difference obtained by subtracting a differential distribution value at a logarithmic molecular weight Log (M) of 6.0 from a differential distribution value at a logarithmic molecular weight Log (M) of 4.5 is &#x2212;15 to 11% inclusive.

Growing community of inventors

Tokyo, Japan

Akihiro Kakehi