| 摘要 |
A semipermeable membrane of a polyaryl ether sulfone having repeating units of the formula, <IMAGE> wherein Ar1 and Ar2 independently represent <IMAGE> wherein X, Y and Z independently represents an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, a chlorine atom or a bromine atom; and l, m and n independently represent zero or an integer of 1 to 4, and having a contact angle of its surface to water of at most 65 DEG .
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