Polypropylene film, polypropylene film integrated with metal layer, film capacitor, and film roll

By controlling the surface properties and wetting tension differences of polypropylene films, and combining biaxially stretched films composed of specific resins, the problems of high-temperature voltage withstand capability and short-circuit faults were solved, resulting in film capacitors with superior high-temperature voltage withstand capability, suppressed short-circuit faults, and clearer metal vapor deposition patterns.

CN122206733APending Publication Date: 2026-06-12OJI HLDG CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
OJI HLDG CORP
Filing Date
2024-11-18
Publication Date
2026-06-12

AI Technical Summary

Technical Problem

Existing polypropylene films have insufficient voltage resistance and reliability at high temperatures, making them prone to short-circuit faults. Furthermore, the metal vapor deposition patterns are not clear, affecting the safety and reliability of capacitors.

Method used

By controlling the surface properties and wetting tension differences of the polypropylene film, ensuring that the product of Sds and Ssc, Sz value, Sz value and wetting tension difference of the first and second sides are within a specific range, and by combining linear and long-chain branched polypropylene resins, biaxially stretched films are formed to improve voltage resistance and pattern clarity.

Benefits of technology

The high-temperature performance significantly improves the voltage withstand capability of film capacitors, suppresses short-circuit faults, ensures clear metal vapor deposition patterns, and enhances the safety and reliability of capacitors.

✦ Generated by Eureka AI based on patent content.

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    Figure SMS_1
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    Figure SMS_2
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    Figure SMS_3
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Abstract

The objective of this invention is to provide a polypropylene film that enables the production of a film capacitor with excellent safety, characterized by suppressed short-circuit faults. Preferably, a polypropylene film is provided that enables the production of a film capacitor with superior voltage withstand at high temperatures, suppressed short-circuit faults, and clearer metal vapor deposition patterns. This objective is achieved by a polypropylene film characterized by having a first side and a second side, wherein (a) among the surface properties parameters specified by EUR 15178N, (1) when the side with the larger product of Sds and Ssc values ​​is designated as the first side and the side with the smaller product as the second side, the product of the first side is 0.0089 (1 / μm). 3 ) or above and 0.0200 (1 / μm) 3 (a) and (b) when the Sz value of the first surface and the Sz value of the second surface are 1.0000 μm or more and are less than the bulk thickness of the film; and / or (b) when the surface with high wetting tension as measured by JIS K6768:1999 is designated as the first surface and the surface with low wetting tension is designated as the second surface, the ratio of the Sbi value of the first surface to the Sbi value of the second surface is 1.00 or less.
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Citation Information

Patent Citations

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

    WO2013146367A1