The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 26, 2006
Filed:
Jun. 17, 2002
Applicants:
Kazuhiro Ono, Otsu, JP;
Kan Fujihara, Otsu, JP;
Kiyokazu Akahori, Otsu, JP;
Inventors:
Assignee:
Kaneka Corporation, Kyoto, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08G 69/26 (2006.01);
U.S. Cl.
CPC ...
Abstract
A polyimide film according to the present invention satisfies Condition (1) in which a tear propagation resistance variation Cis not more than 1.0 g, and/or Condition (2) in which a swelling coefficient Cafter being dipped in an alkaline solution is not more than 20.0. By satisfying these conditions, workability of the polyimide film can be improved and working defects can be effectively prevented, thereby improving productivity of each step.