SEMIPERMEABLE MEMBRANE AND ITS MANUFACTURE

Japanese Patent JP3646362

B2

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.

Uete Takao
Toshihiro Ikeda
Yoshinari Fusaoka

JP21068895A

May 11, 2005

August 18, 1995

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TORAY INDUSTRIES,INC.

B01D69/12; B01D71/56; B01D71/82; (IPC1-7): B01D71/56; B01D69/12; B01D71/82

JP6044334B2
JP531183A
JP63126504A
JP494726A
JP60232209A
JP4100524A

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