Polypropylene film and film capacitor

A polypropylene film and breakdown voltage technology, applied in the field of polypropylene film, can solve the problems of low withstand voltage, low stretching ratio, unevenness, etc., achieve high withstand voltage and reliability, and suppress insulation breakdown voltage. , the effect of less insulation defects
CN106574061AActive Publication Date: 2017-04-19TORAY IND INC
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
TORAY IND INC
Publication Date
2017-04-19

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Abstract

A polypropylene film wherein, a percentage (125R%) calculated by measuring the dielectric breakdown voltage (V / [mu]m) of the film at 30 points in a 125 DEG C atmosphere, and dividing the difference between the maximum value and the minimum value among 20 points obtained by respectively excluding the 5 points having the greatest breakdown voltage and the 5 points having the lowest, by the average value of these 20 points is less than 50%; and a percentage (23R%) calculated by measuring the dielectric breakdown voltage (V / [mu]m) of the film at 30 points in a 23 DEG C atmosphere, and dividing the difference between the maximum value and the minimum value among 20 points obtained by respectively excluding the 5 points having the greatest breakdown voltage and the 5 points having the lowest, by the average value of these 20 points is less than 20%. The present invention relates to a polypropylene film having few insulation defects and minimal variance of dielectric breakdown voltage in high-temperature environments, and in particular there is provided a polypropylene film that exhibits high withstand voltage and reliability in high-voltage capacitor applications.
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Description

technical field

[0001] The present invention relates to a polypropylene film suitable for packaging, industrial use, etc., and more specifically, it relates to the use as a capacitor dielectric with less insulation defects and suppression of uneven dielectric breakdown voltage in high-temperature environments, especially for use in high-voltage capacitors A polypropylene film capable of exhibiting high withstand voltage and reliability. Background technique

[0002] Polypropylene films are excellent in transparency, mechanical properties, electrical properties, etc., and thus are used in various applications such as packaging applications, tape applications, cable packaging, and electrical applications including capacitors.

[0003] Among them, the use in capacitors is not limited to DC applications and AC applications because of its excellent withstand voltage characteristics and low loss characteristics, and it is particularly preferably used in high-voltage capacitors. ...

Claims

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