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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 10799837 B1

PDFFull Text
Date of Patent:
Oct. 13, 2020

Filed:

Jan. 27, 2017

Separation membrane

Applicant:

Toray Industries, Inc., Tokyo, JP;

Inventors:

Gohei Yamamura, Shiga, JP;

Koichi Takada, Shiga, JP;

Hiroki Tomioka, Shiga, JP;

Assignee:

TORAY INDUSTRIES, INC., Tokyo, JP;

Attorney:

Birch, Stewart, Kolash & Birch, LLP

Primary Examiner:

Ana M Fortuna

Int. Cl.
CPC ...
B01D 69/08 (2006.01); B01D 69/02 (2006.01); B01D 67/00 (2006.01); B01D 69/10 (2006.01); B01D 69/12 (2006.01); B01D 71/12 (2006.01); B01D 71/48 (2006.01); B01D 71/56 (2006.01); B01D 61/02 (2006.01);
U.S. Cl.
CPC ...
B01D 69/08 (2013.01); B01D 67/003 (2013.01); B01D 67/0013 (2013.01); B01D 69/02 (2013.01); B01D 69/085 (2013.01); B01D 69/087 (2013.01); B01D 61/025 (2013.01); B01D 69/10 (2013.01); B01D 69/12 (2013.01); B01D 71/12 (2013.01); B01D 71/48 (2013.01); B01D 71/56 (2013.01); B01D 2323/20 (2013.01); B01D 2325/02 (2013.01); B01D 2325/022 (2013.01); B01D 2325/023 (2013.01); B01D 2325/24 (2013.01);
Abstract

The problem addressed by the present invention is to provide a separation membrane with superior permeation performance and separation performance and having few occurrences of defects. The present invention relates to a separation membrane wherein: the separation membrane has a layer (I) with a thickness of 0.5-100 μm; letting, in a cross-section in the direction of thickness of the layer (I), region a be a region with a depth of 50-150 nm from a surface (surface A), region b a region with a depth of 50-150 nm from the other surface (surface B), and region c a region with a thickness of 100 nm where the depth from both surfaces is the same, the average pore diameter Pa for region a and the average pore diameter Pb for region b are both 0.3-3.0 nm and the average pore diameter Pc for region c is 3.0 nm or less; and the percentage of open area Ha for region a, the percentage of open area Hb for region b, and the percentage of open area Hc for region c satisfy the following equations. 2Hc<Ha 2Hc<Hb

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