	US 12,263,451 B2
	Hydrophilic porous membrane and method for producing hydrophilic porous membrane
Akihiro Ishii, Minami-ashigara (JP); Tetsuro Mitsui, Minami-ashigara (JP); and Takeshi Umehara, Minami-ashigara (JP)
Assigned to FUJIFILM Corporation, Tokyo (JP)
Filed by FUJIFILM Corporation, Tokyo (JP)
Filed on Dec. 10, 2020, as Appl. No. 17/117,251.
Application 17/117,251 is a continuation of application No. PCT/JP2019/023623, filed on Jun. 14, 2019.
Claims priority of application No. 2018-114754 (JP), filed on Jun. 15, 2018.
Prior Publication US 2021/0086139 A1, Mar. 25, 2021
Int. Cl. B01D 67/00 (2006.01); B01D 69/02 (2006.01); B01D 69/06 (2006.01); B01D 71/22 (2006.01); B01D 71/44 (2006.01); B01D 71/68 (2006.01)

CPC B01D 67/0088 (2013.01) [B01D 69/02 (2013.01); B01D 69/06 (2013.01); B01D 71/22 (2013.01); B01D 71/441 (2022.08); B01D 71/68 (2013.01); B01D 2323/02 (2013.01); B01D 2325/023 (2013.01); B01D 2325/04 (2013.01); B01D 2325/36 (2013.01)]

17 Claims

1. A hydrophilic porous membrane comprising a porous membrane and a hydroxypropyl cellulose retained in the porous membrane,

wherein the porous membrane contains polysulfone,

the porous membrane has a pore size distribution in a thickness direction, and the pore size distribution has a structure which is asymmetric in the thickness direction,

the hydroxypropyl cellulose has a weight-average molecular weight of 30,000 or more and less than 110,000,

a content of the hydroxypropyl cellulose is more than 0.1% by mass and less than 0.5% by mass with respect to a mass of the hydrophilic porous membrane, and

the hydrophilic porous membrane retains the hydroxypropyl cellulose on an entire surface of the porous membrane.