Biaxially oriented film for electrical insulation and film capacitor made using biaxially oriented film for electrical insulation
AssigneeTeijin Dupont Films Japan Limited
InventorTetsuo Yoshida
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Abstract
Disclosed is a biaxially oriented film for electrical insulation having even better withstand voltage characteristics than before together with excellent film-forming properties. The biaxially oriented film for electrical insulation of the invention is a film that includes a substrate layer containing a crystalline thermoplastic resin as a main component. The substrate layer contains a phenolic stabilizer in an amount of 0.001 wt % or more and 3 wt % or less based on the weight of the substrate layer. The phenolic stabilizer is an alkylenebisamide-type hindered phenol.
Claims17
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/μm or more.
A film capacitor made using 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,
- the film being 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 alkylenebisamide-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],
- the film comprising a coating layer on one side or both sides of the substrate layer, the coating layer containing a silicone compound in an amount of more than 20 wt % to 50 wt % based on the weight of the coating layer,
- the film further comprising 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/μm or more.
Dependencies are inferred from the claim text.