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:
Apr. 27, 2010
Filed:
Oct. 13, 2004
Applicants:
Shunsuke Noumi, Ibaraki, JP;
Yutaka Yamamura, Ibaraki, JP;
Seiryu Nakayama, Ibaraki, JP;
Inventors:
Assignee:
Nitto Denko Corporation, Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B32B 3/26 (2006.01); C08J 9/28 (2006.01);
U.S. Cl.
CPC ...
Abstract
A porous film which has a crosslinked structure and, due to this structure, has excellent resistance to film breakage at high temperatures and excellent transverse-direction shape retention even at high temperatures, uses of the film are provided. The porous film comprises a crosslinked material of a resin composition containing a polyolefin. The film has a peak of shrinkage force in a transverse direction (TD) at a temperature region of the shutdown temperature or higher of the film, and the shrinkage force as measured at the peak being 80 N/cmor lower.