Film for capacitor and method of producing same

Patent metadata

Field	Value
Publication number	US-11891489-B2
Application number	US-201916970627-A
Country	US
Kind code	B2
Filing date	Feb 15, 2019
Priority date	Feb 28, 2018
Publication date	Feb 6, 2024
Grant date	Feb 6, 2024

Abstract

Provided is a film for a capacitor that can improve dielectric strength retention at high temperatures and can also improve metal vapor deposition properties and formability. The film for a capacitor contains a hydrogenated dicyclopentadiene ring-opened polymer that is crystalline and has a heat shrinkage ratio of not less than 0.01% and not more than 1.0% when heated at 200° C. for 10 minutes, a plane orientation factor of 0.01 or more, a density of 1.03×10 6 g/m 3 or more, and a thickness of 15.0 μm or less.

First claim

The invention claimed is:

1. A film for a capacitor comprising a hydrogenated dicyclopentadiene ring-opened polymer that is crystalline, and having:
a heat shrinkage ratio of not less than 0.01% and not more than 1.0% when heated at 200° C. for 10 minutes;
a plane orientation factor of 0.01 or more;
a density of 1.03×10 6 g/m 3 or more; and
a thickness of 15.0 μm or less.

2. A method of producing the film for a capacitor according to claim 1 , comprising:
a stretching treatment step of performing stretching treatment of an unstretched film under conditions of a stretching temperature of not lower than a glass-transition temperature Tg of the hydrogenated dicyclopentadiene ring-opened polymer and not higher than a melting point Tm of the hydrogenated dicyclopentadiene ring-opened polymer and a stretching ratio of not less than 1.5 times and not more than 10 times;
a heat treatment step of performing heat treatment of a stretched film that has been stretched through the stretching treatment step under conditions of a heating temperature of not lower than 150° C. and not higher than 240° C. and a heating time of not less than 0.1 minutes and not more than 600 minutes; and
a relaxation treatment step of performing relaxation treatment of the stretched film that has been heated through the heat treatment step under conditions of a relaxation temperature of not lower than 150° C. and not higher than 240° C. and a relaxation time of not less than 0.1 minutes and not more than 600 minutes with a reduction ratio of film fixed width of more than 0% and not more than 20%.

Assignees

• Zeon Corp

Inventors

• Kato Ayako
• Miyazawa Shinsuke

Classifications

• C08J5/18 Primary

  Manufacture of films or sheets · CPC title

• B29C55/02

  of plates or sheets · CPC title

• C08G61/08

  of carbocyclic compounds containing one or more carbon-to-carbon double bonds in the ring · CPC title

• H01G4/18 Primary

  of synthetic material, e.g. derivatives of cellulose (H01G4/16 takes precedence) · CPC title

• C08G2261/3325

  derived from other polycyclic systems · CPC title