US 12,172,133 B2
Porous hollow fiber membrane
Akihiro Hayashi, Otsu (JP); Kaori Akaike, Tokyo (JP); Suguru Ushiro, Otsu (JP); and Yoshiyuki Ueno, Otsu (JP)
Assigned to TORAY INDUSTRIES, INC., Tokyo (JP)
Appl. No. 17/049,806
Filed by TORAY INDUSTRIES, INC., Tokyo (JP)
PCT Filed May 24, 2019, PCT No. PCT/JP2019/020597
§ 371(c)(1), (2) Date Oct. 22, 2020,
PCT Pub. No. WO2019/225730, PCT Pub. Date Nov. 28, 2019.
Claims priority of application No. 2018-099331 (JP), filed on May 24, 2018.
Prior Publication US 2021/0213394 A1, Jul. 15, 2021
Int. Cl. B01D 69/02 (2006.01); B01D 63/02 (2006.01); B01D 69/08 (2006.01); B01D 71/38 (2006.01); B01D 71/40 (2006.01); B01D 71/62 (2006.01); B01D 71/68 (2006.01); C08J 9/26 (2006.01)
CPC B01D 69/02 (2013.01) [B01D 63/031 (2022.08); B01D 69/08 (2013.01); B01D 71/381 (2022.08); B01D 71/40 (2013.01); B01D 71/62 (2013.01); B01D 71/68 (2013.01); C08J 9/26 (2013.01); B01D 2317/02 (2013.01); B01D 2319/04 (2013.01); B01D 2325/023 (2013.01); B01D 2325/04 (2013.01); B01D 2325/341 (2022.08); B01D 2325/36 (2013.01); B01D 2325/38 (2013.01); C08J 2381/06 (2013.01); C08J 2439/06 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A porous hollow fiber membrane containing a polysulfone-based polymer as a main component, which has an asymmetric structure in which the membrane has an inner surface side that is dense and has an outer surface side that is coarse, wherein
an average of a minor axis diameter of pores of the membrane inner surface is 20 nm or more and 40 nm or less,
the membrane inner surface has an open porosity of 5% or more and 30% or less,
the membrane outer surface, the membrane inner surface and an interior of the membrane all support a coating of a polymer including a monocarboxylic acid vinyl ester unit, and
an average of a ratio (ACOO)/(ACC) of a peak area (ACOO) of an infrared absorption spectrum derived from an ester group to a peak area (ACC) of an infrared absorption spectrum derived from a benzene ring of the polysulfone-based polymer is 0.01 or more and 1 or less for the each of the inner surface and the outer surface, when the measurement is performed on surface of the outer surface and the inner surface of the porous hollow fiber membrane by infrared microspectroscopy.