Nippon Shokubai Kagaku Kogyo Co., Ltd.

Tetsuzo Hayashi

Hiroya Kobayashi

Ryoichi Oshiumi

Shuzo Fukuchi

A composite semipermeable membrane comprising a porous support and a crosslinked thin film formed on said porous support, said crosslinked thin film being formed by reacting compound (A) which is at least one compound selected from the group consisting of polyalkylenimines and polyalkylenimine derivatives, compound (B) which is at least one compound selected from a group of compounds typified by piperazine, 2,5-dimethylpiperazine, 4-aminomethylpiperidine and 1,4,8,11-tetraazacyclotetradecane, and compound (C) as a crosslinking agent which is a compound having in one molecule two or more functional groups capable of reacting with amino groups; and a process for preparing said composite semipermeable membrane.

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Osaka, Japan

Tetsuzo Hayashi