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:
Jan. 13, 2015
Filed:
Apr. 16, 2007
Satoshi Shiki, Tokyo, JP;
Hiroyoshi Ohya, Tokyo, JP;
Noboru Kubota, Tokyo, JP;
Makiko Hattori, Tokyo, JP;
Satoshi Shiki, Tokyo, JP;
Hiroyoshi Ohya, Tokyo, JP;
Noboru Kubota, Tokyo, JP;
Makiko Hattori, Tokyo, JP;
Asahi Kasei Chemicals Corporation, Tokyo, JP;
Abstract
The present invention provides a PVDF porous film and method for producing it, which has high water permeability and high chemical resistance to washing chemicals and the like that has been difficult to realize with conventional polymer porous films, and which can be used over a prolonged period of time, and a method of producing the same and the like. Namely, the present invention provides a porous film in which the degree of crystallization of the PVDF resin is 50% or more but not more than 90%, and the product of the degree of crystallization of the PVDF resin and the specific surface area of the film is 300 (%·m/g) or more but not more than 2000 (%·m/g).