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Biaxially oriented film for electrical insulation and film capacitor made using biaxially oriented film for electrical insulation

  • US 9,754,721 B2
  • Filed: 10/26/2010
  • Issued: 09/05/2017
  • Est. Priority Date: 10/28/2009
  • Status: Active Grant
First Claim
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1. A process for producing a film capacitor comprising forming the film capacitor with a biaxially oriented film for electrical insulation comprising a substrate layer containing crystalline thermoplastic resin as a main component, wherein the crystalline thermoplastic resin is a polyethylene naphthalene dicarboxylate alone or in combination with syndiotactic polystyrene,wherein the polyethylene naphthalene dicarboxylate is present in an amount of 60 wt % or more based on the total amount of the crystalline thermoplastic resin,wherein the film is characterized in that the substrate layer contains a phenolic stabilizer in an amount of 0.3 wt % or more and 1.5 wt % or less based on the weight of the substrate layer, and the phenolic stabilizer is an alkylene bisamide-type hindered phenol,wherein the alkylene bisamide-type hindered phenol is N,N′

  • -hexane-1,6-diylbis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionamide],wherein the film comprises a coating layer on one side or both sides of the substrate layer, the coating layer containing a silicone compound in an amount of 1 to 50 wt % based on the weight of the coating layer,wherein the film further comprises a metal layer on the coating layer,wherein the phenolic stabilizer is melt-kneaded with polymerized polyester,wherein a breakdown voltage of the film at 25°

    C. is 450V/μ

    m or more.

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