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Title:
SEMIPERMEABLE MEMBRANE AND ITS MANUFACTURE
Document Type and Number:
Japanese Patent JP3646362
Kind Code:
B2
Abstract:

PROBLEM TO BE SOLVED: To improve the water penetrability of a semipermeable membrane and manufacture a membrane of high selective penetrability by providing sulfonic acid and a functional group of specified structure as a semipermeable membrane.
SOLUTION: Sulfonic acid is introduced into an asymmetrical membrane or a composite semipermeable membrane provided with a reactive group such as epoxy or aziridine and manufactured preliminarily. A semipermeable membrane based on a formula thus provided (In the formula, -R1 represents -HO, -NH2 or the like, -R2 represents a hydrogen atom or a substituent or a non-substituent aliphatic group or an aromatic group, M represents hydrogen ions or metal anodic ions, (n) represents an integer of 1 or more.) is provided with high selectivity and also high water penetrability. The semipermeable membrane is composed of polyamide and a composite semipermeable membrane consisting of a separating function layer and a microporous supporting membrane. The semipermeable membrane is manufactured by reacting a compound, which reacts with sulfonic acid and a reactive group (for instance, one kind of epoxy, aziridine, episulfide, halogenated alkyl, amino and carboxylic acid) with the semipermeable membrane having the reactive group.


Inventors:
Uete Takao
Toshihiro Ikeda
Yoshinari Fusaoka
Application Number:
JP21068895A
Publication Date:
May 11, 2005
Filing Date:
August 18, 1995
Export Citation:
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Assignee:
TORAY INDUSTRIES,INC.
International Classes:
B01D69/12; B01D71/56; B01D71/82; (IPC1-7): B01D71/56; B01D69/12; B01D71/82
Domestic Patent References:
JP6044334B2
JP531183A
JP63126504A
JP494726A
JP60232209A
JP4100524A