Patent ID: 11891489
Assignee: ZEON CORPORATION
Field: Other special machines (Mechanical engineering)
Classification: CPC C  B  H | IPC B  C  H

Claim 1:
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%.