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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 11794150 B1

PDFFull Text
Date of Patent:
Oct. 24, 2023

Filed:

Dec. 23, 2020

Separation membrane and method for producing separation membrane

Applicant:

Toray Industries, Inc., Tokyo, JP;

Inventors:

Hiroki Eimura, Otsu, JP;

Koichi Takada, Otsu, JP;

Marina Otsuka, Otsu, JP;

Masayuki Hanakawa, Otsu, JP;

Assignee:

TORAY INDUSTRIES, INC., Tokyo, JP;

Attorney:

RatnerPrestia

Primary Examiner:

Krishnan S Menon

Int. Cl.
CPC ...
B01D 69/02 (2006.01); B01D 65/08 (2006.01); B01D 67/00 (2006.01); B01D 69/08 (2006.01); B01D 71/22 (2006.01); B01D 71/34 (2006.01); B01D 71/40 (2006.01); B01D 71/44 (2006.01); B01D 71/48 (2006.01); B01D 71/52 (2006.01); B01D 71/56 (2006.01); B01D 71/66 (2006.01);
U.S. Cl.
CPC ...
B01D 69/02 (2013.01); B01D 65/08 (2013.01); B01D 67/0009 (2013.01); B01D 67/0083 (2013.01); B01D 69/08 (2013.01); B01D 71/22 (2013.01); B01D 71/34 (2013.01); B01D 71/40 (2013.01); B01D 71/44 (2013.01); B01D 71/48 (2013.01); B01D 71/52 (2013.01); B01D 71/56 (2013.01); B01D 71/66 (2013.01); B01D 2323/12 (2013.01); B01D 2325/022 (2013.01); B01D 2325/0283 (2022.08); B01D 2325/04 (2013.01); B01D 2325/20 (2013.01); B01D 2325/24 (2013.01);
Abstract

The present invention relates to a separation membrane including a thermoplastic polymer selected from a cellulose ester and a polyamide, in which, when regions obtained by dividing a cross-sectional surface perpendicular to a longitudinal direction of the separation membrane into 5 at an equal interval are defined as regions 1 to 5, all the regions 1 to 5 have a number average pore diameter changing rate αof −0.25 to 0.25, and at least one of the regions 1 to 5 is a region P that satisfies conditions (a) and (b): (a) a value of area average pore diameter D/number average pore diameter Dis 2.50 to 6.00; and (b) a number average W of fine pores that are located at a distance smaller than Lfrom a center of respective coarse pores is 10 to 30.

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