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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.:

US 8980421 B1

PDFFull Text
Date of Patent:
Mar. 17, 2015

Filed:

Apr. 04, 2011

Porous polyimide membrane and process for production thereof

Applicants:

Shyusei Ohya, Chiba, JP;

Hiroshi Shimazaki, Chiba, JP;

Makoto Babazono, Chiba, JP;

Yoshiaki Watanabe, Chiba, JP;

Dai Yokoyama, Chiba, JP;

Yuuichi Fujii, Chiba, JP;

Makoto Matsuo, Chiba, JP;

Inventors:

Shyusei Ohya, Chiba, JP;

Hiroshi Shimazaki, Chiba, JP;

Makoto Babazono, Chiba, JP;

Yoshiaki Watanabe, Chiba, JP;

Dai Yokoyama, Chiba, JP;

Yuuichi Fujii, Chiba, JP;

Makoto Matsuo, Chiba, JP;

Assignee:

Ube Industries, Ltd., Ube-shi, JP;

Attorney:

Oblon, McClelland, Maier & Neustadt, L.L.P.

Primary Examiner:

Hai Vo

Int. Cl.
CPC ...
B32B 3/26 (2006.01); B29C 71/02 (2006.01); C08G 69/26 (2006.01); B29C 41/24 (2006.01); B01D 67/00 (2006.01); B01D 71/64 (2006.01); B29K 79/00 (2006.01); B29K 105/04 (2006.01); H01M 2/16 (2006.01);
U.S. Cl.
CPC ...
B29C 41/24 (2013.01); B01D 67/0006 (2013.01); B01D 67/0093 (2013.01); B01D 71/64 (2013.01); B01D 2325/02 (2013.01); B01D 2325/025 (2013.01); B29K 2079/08 (2013.01); B29K 2105/04 (2013.01); H01M 2/1653 (2013.01); H01M 2/1686 (2013.01);
Abstract

A porous polyimide film having a three-layer structure that comprises two surface layers (a) and (b) and a macrovoid layer sandwiched between the surfaces layers (a) and (b). The macrovoid layer has a partition wall bonding to the surface layers (a) and (b), and multiple macrovoids each surrounded by the partition wall and the surface layers (a) and (b) and having a mean pore size in the film plane direction of from 10 to 500 μm. The partition wall of the macrovoid layer has a thickness of from 0.1 to 50 μm and has multiple pores having a mean pore size of from 0.01 to 50 μm. The surface layers (a) and (b) each have a thickness of from 0.1 to 50 μm, at least one of the surface layers has multiple pores having a mean pore size of from more than 5 μm to 200 μm, and the other surface layer has multiple pores having a mean pore size of from 0.01 to 200 μm. The pores in the partition wall of the macrovoid layer as well as in the surface layers (a) and (b) communicate with each other and further communicate with the macrovoids. The film has a total thickness of from 5 to 500 μm and a porosity of from 60 to 95%.

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