公开(公告)号：EP4129457A1

公开(公告)日：2023-02-08

申请号：EP21782001.8

申请日：2021-03-30

申请人： TOYOBO CO., LTD.

发明人： SHIBUYA, Masafumi ,  OHKAME, Takashi

IPC分类号： B01D71/52 ,  B01D71/68 ,  B01D71/82

摘要： [Problem] Provided is a semipermeable membrane that achieves chemical resistance (chlorine resistance, acid resistance, alkali resistance), membrane performance, and membrane strength by sulfonating a polyphenylene-based semipermeable membrane base material under specific conditions. [Solution] A polyphenylene-based semipermeable membrane that is composed of a material containing a polyphenylene-based resin, wherein the semipermeable membrane has a first surface of which at least a portion is sulfonated, and wherein, when concentration distribution of elemental sulfur derived from a sulfonic acid group is measured by elemental analysis in a cross section in a thickness direction of the semipermeable membrane, a ratio of a sulfonated layer obtained by the following expression is 50% or less: Ratio of Sulfonated Layer (%) = Sulfonated Layer Thickness / (Sulfonated Layer Thickness + Non-Sulfonated Layer Thickness) × 100.

公开(公告)号：EP4029595A1

公开(公告)日：2022-07-20

申请号：EP20862648.1

申请日：2020-09-11

申请人： TOYOBO CO., LTD.

发明人： OHKAME, Takashi ,  SHIBUYA, Masafumi

IPC分类号： B01D69/10 ,  B01D69/12 ,  B01D71/38 ,  B01D71/52 ,  B01D71/82 ,  B32B27/00 ,  B32B27/30 ,  C08J9/36

摘要： A composite membrane comprising a supporting membrane that includes polyphenylene oxide and a separation layer that is disposed on one main surface of the supporting membrane, wherein the polyphenylene oxide is sulfonated on the one main surface of the supporting membrane and the separation layer includes polyvinyl alcohol having an ionic functional group.