US 12,138,595 B2
Composite semipermeable membrane
Yuta Amano, Ehime (JP); Shunsuke Tabayashi, Ehime (JP); Ryosuke Okanishi, Ehime (JP); Takashi Yoshino, Ehime (JP); Takao Sasaki, Ehime (JP); Hiroki Minehara, Shiga (JP); and Masaki Higashi, Ehime (JP)
Assigned to TORAY INDUSTRIES, INC., Tokyo (JP)
Appl. No. 18/287,795
Filed by TORAY INDUSTRIES, INC., Tokyo (JP)
PCT Filed Apr. 22, 2022, PCT No. PCT/JP2022/018639
§ 371(c)(1), (2) Date Oct. 20, 2023,
PCT Pub. No. WO2022/225062, PCT Pub. Date Oct. 27, 2022.
Claims priority of application No. 2021-072382 (JP), filed on Apr. 22, 2021.
Prior Publication US 2024/0198293 A1, Jun. 20, 2024
Int. Cl. B01D 69/02 (2006.01); B01D 69/10 (2006.01); B01D 69/12 (2006.01)
CPC B01D 69/02 (2013.01) [B01D 69/10 (2013.01); B01D 69/12 (2013.01); B01D 2325/04 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A composite semipermeable membrane comprising:
a support membrane; and
a separation functional layer provided on the support membrane, wherein
the separation functional layer comprises a plurality of protrusions formed of a thin membrane, and
at least a part of the plurality of protrusions has a ratio (Wa/Wb) of larger than 1.3 and 2.0 or less in cross sections at arbitrary ten positions each having a length of 2.0 μm in a membrane surface direction of the support membrane, provided that Wa is a maximum width of the protrusion and Wb is a root width of the protrusion.