Daicel Corporation

Ryoshu Suzuki

Kiyoshi Ishii

Hitoshi Tsugaya

Zenjiro Honda

A semipermeable membrane composed of a water-insoluble, cross-linked, membrane-forming polymer (hereinafter referred to as 'polymer (II)') which is obtained by partially converting the hydroxyl groups of a polymer represented by the following formula (hereinafter referred to as 'polymer (I)'): ##STR1## wherein R and R' are halogen, nitro, methyl or ethyl,

Semipermeable membrane

A semipermeable membrane composed of a water-insoluble, membrane-forming polymer (hereinafter referred to as 'polymer (II)') which is obtained by partially converting the hydroxyl groups of a polymer represented by the following formula (hereinafter referred to as 'polymer (I)'): ##STR1## wherein R and R' are halogen, nitro, methyl or ethyl, X stands for a divalent group selected from methylene, ethylene, isopropylidene, ether (--O--), carbonyl (--CO--), sulfide (--S--), sulfoxide (--SO--) and sulfone (--SO.sub.2 --), l and m are integers of from 0 to 4, p is 0 or 1, and n is an integer of from 100 to 1000, to sulfuric acid groups or alkali metal, ammonium or nitrogen-containing basic organic compound salts thereof.

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Saitama, Japan

Ryoshu Suzuki