公开(公告)号：US3912834A

公开(公告)日：1975-10-14

申请号：US36155773

申请日：1973-05-18

申请人： KANEGAFUCHI CHEMICAL IND

发明人： IMAI SATOSHI ,  EGUCHI TAMIYUKI ,  SHIMOKAWA MASAAKI

IPC分类号： B01D67/00 ,  C25B13/04 ,  B01D13/04 ,  D06M13/54 ,  D06M15/32

CPC分类号： B01D69/10 ,  Y10T442/2033

摘要： A selectively permeable composite membrane is produced by providing a solution of a film-forming polymer, impregnating a liquid in which the film-forming polymer is insoluble to a porous backing material to the extent that at least one of surfaces of the backing material remains substantially free from the liquid while other portions thereof become wet, applying the solution of film-forming polymer to the surface of backing material to form a layer thereof, and gelling said layer of solution to form a membrane thereof.