Dielectric film

Patent metadata

Field	Value
Publication number	US-10529494-B2
Application number	US-201515512920-A
Country	US
Kind code	B2
Filing date	Sep 24, 2015
Priority date	Sep 30, 2014
Publication date	Jan 7, 2020
Grant date	Jan 7, 2020

Abstract

The present invention is a film capacitor comprising a dielectric film and a metal layer, the dielectric film being a resin film obtained by stretching an unstretched film produced using a crystalline hydrogenated dicyclopentadiene ring-opening polymer, and heating the resulting stretched film, and the resin film having a softening point of 250 to 320° C., a thermal shrinkage ratio of 0.01 to 5.0% when heated at 200° C. for 10 minutes, a loss tangent (tan δ) of 0.0001 to 0.0010, and a coefficient of static friction of 0.01 to 1.00. The present invention provides a film capacitor that includes a resin film as a dielectric film, the resin film exhibiting excellent heat resistance, excellent withstand voltage properties, and excellent workability.

First claim

The invention claimed is:

1. A dielectric film comprising a resin film obtained by stretching an unstretched film produced using a crystalline hydrogenated dicyclopentadiene ring-opening polymer, and heating the resulting stretched film, wherein
a ratio of racemo diads in the crystalline hydrogenated dicyclopentadiene ring-opening polymer is 60% or more,
the resin film has a softening point of 250 to 320° C., a thermal shrinkage ratio of 0.01 to 5.0% when heated at 200° C. for 10 minutes, a loss tangent (tan δ) of 0.0001 to 0.0010, and a coefficient of static friction of 0.01 to 1.00, and
the resin film is obtained by stretching the unstretched film at a stretching temperature of 95 to 135° C., a stretching ratio of 1.2 to 10, and a stretching speed of 100 to 30,000 mm/min, and heating the resulting stretched film at a heating temperature of 150 to 240° C. for a heating time of 0.1 to 600 minutes.

Assignees

• Zeon Corp

Inventors

• Miyazawa Shinsuke
• Kato Ayako

Classifications

• C08J5/18

  Manufacture of films or sheets · CPC title

• B29C55/14

  successively · CPC title

• B32B2457/16

  Capacitors · CPC title

• H01G4/33 Primary

  Thin- or thick-film capacitors {(thin- or thick-film circuits; capacitors without a potential-jump or surface barrier specially adapted for integrated circuits, details thereof, multistep manufacturing processes therefor)} · CPC title

• B29K2045/00

  Use of polymers of unsaturated cyclic compounds having no unsaturated aliphatic groups in a side-chain, e.g. coumarone-indene resins or derivatives thereof, as moulding material · CPC title