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Polypropylene film for capacitor

A polypropylene film and capacitor technology, applied in the direction of fixed capacitor dielectric, fixed capacitor parts, thin material processing, etc., can solve the problems of no example, no inspiration, unsatisfied, etc., to improve resistance, long life and long-term Durable, high dielectric breakdown strength effect

Active Publication Date: 2013-09-25
OJI HLDG CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this document neither exemplifies nor suggests long-term withstand voltage at high temperature and high voltage loads.
[0013] In this way, the stringent requirements for long-term durability (capacitor life performance) at high temperatures and higher voltage loads from the capacitor industry that has progressed significantly have not yet been met even with the above technologies.

Method used

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  • Polypropylene film for capacitor
  • Polypropylene film for capacitor
  • Polypropylene film for capacitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0159] Add 5000ppm IRGANOX (registered trademark) 1010, 20ppm 2,5-dimethyl-2,5-di(t-butylperoxy)hexyl as secondary antioxidant to resin E manufactured by Prime Polymer Co., Ltd. Alkanes were melt-kneaded in a granulator, and the raw resin A whose molecular weight distribution was adjusted by peroxidative decomposition treatment was supplied to the extruder, melted at a resin temperature of 250°C, and extruded through a T-die. , was coiled to a metal drum whose surface temperature was maintained at 95° C. and solidified to produce a cast green sheet with a thickness of about 140 μm. Next, the unstretched cast green sheet was stretched to 5 times in the moving direction at a temperature of 140° C., immediately cooled to room temperature, and then stretched in the width direction at a temperature of 165° C. 10 times, a very thin biaxially stretched polypropylene film with a thickness of 2.8 μm was obtained. Table 1 summarizes the molecular characteristics of the obtained thin fi...

Embodiment 2

[0161] Instead of the raw resin A of Example 1, a raw resin B in which IRGANOX (registered trademark) 1010 as a secondary antioxidant was added to the molecular weight distribution adjustment resin B subjected to peroxidative decomposition treatment in the same manner as in Example 1 was supplied to The extruder was carried out in the same manner as in Example 1 except for this, and a very thin biaxially stretched polypropylene film having a thickness of 2.8 μm was obtained. Table 1 summarizes the molecular characteristics of the obtained thin film and the physical property values ​​of the thin film. In addition, the evaluation results as capacitor films are summarized in Table 2. It should be noted that the difference in molecular weight differential distribution, molecular weight (Mw), molecular weight distribution (Mw / Mn), percentage of meso pentads, and residual secondary antioxidant in Table 1 are analytical values ​​of the film.

Embodiment 3

[0163] Instead of the raw resin A of Example 1, a raw resin C in which 5500 ppm of IRGANOX (registered trademark) 1010 was added as a secondary antioxidant to the molecular weight distribution adjustment resin C subjected to peroxidative decomposition treatment was supplied to the extruder, except Except for this, a very thin biaxially stretched polypropylene film having a thickness of 2.8 μm was obtained in the same manner as in Example 1. Table 1 summarizes the molecular characteristics of the obtained thin film and the physical property values ​​of the thin film. In addition, the evaluation results as capacitor films are summarized in Table 2. It should be noted that the difference in molecular weight differential distribution, molecular weight (Mw), molecular weight distribution (Mw / Mn), percentage of meso pentads, and residual secondary antioxidant in Table 1 are analytical values ​​of the film.

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Abstract

Provided is a biaxially stretched polypropylene film for capacitors which is ultrathin and is excellent in terms of heat resistance, withstand voltage performance, and long-term durability. The biaxially stretched polypropylene film has such a degree of stereoregularity that the mesopentad content ([mmmm]), determined by high-temperature nuclear magnetic resonance (high-temperature NMR) spectroscopy, is 94% or greater but less than 98%. This film, in an examination by gel permeation chromatography (GPC), has a weight-average molecular weight (Mw) of 250,000-450,000 and a molecular-weight distribution (Mw / Mn) of 4-7 and gives a molecular-weight distribution curve in which the difference obtained by subtracting the differentiated distribution value corresponding to a logarithmic molecular weight, Log(M), of 6 from the differentiated distribution value corresponding to a Log(M) of 4.5 is 9-15%. The film is produced using a raw polypropylene resin in which the constitution concerning molecular-weight distribution has been regulated by degrading the polypropylene resin with a peroxide.

Description

technical field [0001] The present invention relates to the improvement of the heat resistance and voltage resistance of ultra-thin capacitor films used in electronic and electrical equipment, and in more detail, to the voltage resistance characteristics at high temperature (improvement of breakdown voltage value) or under load Biaxially oriented polypropylene film for capacitors with a very thin film thickness, which is suitable for high-capacity capacitors with excellent long-term durability at high temperatures under high voltage (ie, long life, high life performance). Background technique [0002] Biaxially oriented polypropylene films are widely used as dielectric films for capacitors due to their excellent electrical properties such as withstand voltage performance and low dielectric loss properties, as well as high moisture resistance. [0003] Polypropylene film for capacitors is preferably used for high-voltage capacitors, filters for various switching power supplie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G4/18C08J5/18C08L23/12
CPCC08J5/18C08J2323/12C08L23/12Y10T428/24355H01G4/18
Inventor 石渡忠和松尾祥宜宍户雄一
Owner OJI HLDG CORP
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