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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 9409377 B1

PDFFull Text
Date of Patent:
Aug. 09, 2016

Filed:

Apr. 28, 2010

Composite membrane support and composite membrane using the same

Applicants:

Minoru Yoshida, Tokyo, JP;

Ikuo Ueno, Tokyo, JP;

Norihisa Matsuo, Tokyo, JP;

Hirotoshi Ishizuka, Kusatsu, JP;

Hiroki Fujioka, Kusatsu, JP;

Mieko Nishi, Kusatsu, JP;

Inventors:

Minoru Yoshida, Tokyo, JP;

Ikuo Ueno, Tokyo, JP;

Norihisa Matsuo, Tokyo, JP;

Hirotoshi Ishizuka, Kusatsu, JP;

Hiroki Fujioka, Kusatsu, JP;

Mieko Nishi, Kusatsu, JP;

Assignees:

ASAHI KASEI FIBERS CORPORATION, Osaka-Shi, JP;

NITTO DENKO CORPORATION, Ibaraki-Shi, JP;

Attorney:

Finnegan, Henderson, Farabow, Garrett & Dunner, L.L.P.

Primary Examiner:

Dirk Bass

Int. Cl.
CPC ...
B41M 5/00 (2006.01); B29C 70/08 (2006.01); B32B 5/26 (2006.01); B01D 63/10 (2006.01); B01D 69/10 (2006.01); B01D 69/12 (2006.01); B32B 5/02 (2006.01); D04H 1/559 (2012.01); D04H 3/02 (2006.01); D04H 3/14 (2012.01);
U.S. Cl.
CPC ...
B32B 5/26 (2013.01); B01D 63/10 (2013.01); B01D 69/10 (2013.01); B01D 69/12 (2013.01); B32B 5/022 (2013.01); D04H 1/559 (2013.01); D04H 3/02 (2013.01); D04H 3/14 (2013.01); B32B 2250/03 (2013.01); B32B 2250/20 (2013.01); B32B 2250/40 (2013.01); B32B 2255/02 (2013.01); B32B 2255/26 (2013.01); B32B 2255/28 (2013.01); B32B 2262/0276 (2013.01); B32B 2262/0284 (2013.01); B32B 2305/026 (2013.01); B32B 2305/20 (2013.01); B32B 2305/28 (2013.01); B32B 2307/726 (2013.01); Y10T 442/609 (2015.04); Y10T 442/66 (2015.04);
Abstract

An object of the present invention is to provide a composite membrane support composed of a dry process thermoplastic resin filaments nonwoven fabric having a significantly high uniformity to enable formation of a porous layer free from strike-through or a defect such as pinhole at the film formation, producing no skin layer defect at the formation of a skin layer, and being excellent in the mechanical strength and dimensional stability at high temperatures, and a high-performance composite membrane and a composite membrane element each using the composite membrane support. The composite membrane support of the present invention is a laminate dry process thermoplastic resin filaments nonwoven fabric comprising three or more layers containing at least a meltblown fiber layer as an interlayer and spunbond fiber layers on both sides of the interlayer, wherein the average value of air flow resistance is from 2.0 to 30.0 kPa·s/m and the ratio between the average value and the standard deviation of air flow resistance is 0.6 or less.

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