	US 12,434,202 B2
	Composite semipermeable membrane
Harutoki Shimura, Shiga (JP); Takaaki Yasuda, Shiga (JP); and Shinya Mitsui, Shiga (JP)
Assigned to TORAY INDUSTRIES, INC., Tokyo (JP)
Appl. No. 18/269,385
Filed by TORAY INDUSTRIES, INC., Tokyo (JP)
PCT Filed Dec. 24, 2021, PCT No. PCT/JP2021/048432 § 371(c)(1), (2) Date Jun. 23, 2023, PCT Pub. No. WO2022/138975, PCT Pub. Date Jun. 30, 2022.
Claims priority of application No. 2020-216354 (JP), filed on Dec. 25, 2020.
Prior Publication US 2024/0100487 A1, Mar. 28, 2024
Int. Cl. B01D 53/22 (2006.01); B01D 69/02 (2006.01); B01D 69/10 (2006.01); B01D 69/12 (2006.01); B01D 71/56 (2006.01)

CPC B01D 69/10 (2013.01) [B01D 69/02 (2013.01); B01D 69/1214 (2022.08); B01D 71/56 (2013.01); B01D 2325/43 (2022.08)]

7 Claims

1. A composite semipermeable membrane, comprising:

a microporous support layer; and

a separation functional layer provided on the microporous support layer,

wherein

the separation functional layer comprises a crosslinked wholly aromatic polyamide which is a polycondensation product of a polyfunctional aromatic amine and a polyfunctional aromatic acid chloride and contains amino groups and carboxyl groups, and

in positive secondary ions measured on a surface of the separation functional layer by time-of-flight secondary ion mass spectrometry, when (count number of m/z=104.03)/(count number of m/z=108.06) is denoted by a, and a molar ratio (carboxyl group/amino group) of the carboxyl groups to the amino groups, which is obtained by analyzing the entire separation functional layer by ¹³C solid state NMR, is denoted by b, the following formulae (1) and (2) are satisfied:

a≥5.0 (1); and

a/b≥4.3 (2).