US 12,186,711 B2
Composite semipermeable membrane
Shunsuke Tabayashi, Ehime (JP); Ryosuke Okanishi, Ehime (JP); Yuta Amano, 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. 18/287,800
Filed by TORAY INDUSTRIES, INC., Tokyo (JP)
PCT Filed Apr. 22, 2022, PCT No. PCT/JP2022/018640
§ 371(c)(1), (2) Date Oct. 20, 2023,
PCT Pub. No. WO2022/225063, PCT Pub. Date Oct. 27, 2022.
Claims priority of application No. 2021-072383 (JP), filed on Apr. 22, 2021.
Prior Publication US 2024/0198294 A1, Jun. 20, 2024
Int. Cl. B01D 69/12 (2006.01); B01D 69/02 (2006.01); B01D 69/10 (2006.01)
CPC B01D 69/12 (2013.01) [B01D 69/02 (2013.01); B01D 69/10 (2013.01); B01D 2325/04 (2013.01); B01D 2325/06 (2013.01)] 6 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 thin membrane,
the thin membrane has a fold structure comprising a plurality of protrusions,
an actual length L of the thin membrane per 1 μm length of the support membrane in a cross-sectional direction perpendicular to a membrane surface is 3.0 μm or more and 100 μm or les,
a thickness of the thin membrane in the protrusion is 15 nm or more and 30 nm or less,
the fold structure comprises a protrusion having a height of 200 nm or more and a protrusion having a height of 10 nm or more and less than 200 nm, and
a ratio (N/M) is 1/20 or more and ½ or less, wherein N is the number of the protrusions having the height of 200 nm or more and M is the number of the protrusions having the height of 10 nm or more.