US 11,654,400 B2
Porous hollow fiber membrane and method for producing porous hollow fiber membrane
Yuki Miki, Tokyo (JP); and Daisuke Okamura, Tokyo (JP)
Assigned to ASAHI KASEI KABUSHIKI KAISHA, Tokyo (JP)
Appl. No. 16/348,268
Filed by ASAHI KASEI KABUSHIKI KAISHA, Tokyo (JP)
PCT Filed Oct. 26, 2017, PCT No. PCT/JP2017/038805
§ 371(c)(1), (2) Date May 8, 2019,
PCT Pub. No. WO2018/088232, PCT Pub. Date May 17, 2018.
Claims priority of application No. JP2016-218598 (JP), filed on Nov. 9, 2016.
Prior Publication US 2019/0314767 A1, Oct. 17, 2019
Int. Cl. B01D 69/02 (2006.01); B01D 69/14 (2006.01); B01D 69/08 (2006.01); B01D 67/00 (2006.01); B01D 71/34 (2006.01); B01D 71/02 (2006.01); C08J 9/26 (2006.01)
CPC B01D 69/02 (2013.01) [B01D 67/0016 (2013.01); B01D 67/0079 (2013.01); B01D 69/081 (2013.01); B01D 69/087 (2013.01); B01D 69/148 (2013.01); B01D 71/027 (2013.01); B01D 71/34 (2013.01); C08J 9/26 (2013.01); B01D 2325/02 (2013.01); B01D 2325/04 (2013.01); C08J 2327/16 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A porous hollow fiber membrane made of a thermoplastic resin and having a pre-filtration side and a filtration side, wherein the porous hollow fiber membrane has:
a membrane thickness of 0.050 mm or larger and 0.25 mm or smaller,
a strength coefficient K of 1.7 or more, where the strength coefficient K is defined as K=(compressive strength)/((membrane thickness)/(inside diameter/2))3, and
a rate of pure water permeation of 1200 L/m2/hr or more, and
wherein a coefficient of variation in a thickness of a backbone forming a surface on the filtration side is 70% or less, and
the thickness of the backbone is a shortest distance between adjacent pores measured in a direction perpendicular to a longitudinal direction on the surface of the filtration side of the hollow fiber membrane.