Nippon Steel Corporation

Nippon Steel Chemical Co., Ltd.

Takerou Teramoto

Masao Sakashita

Shingo Kazama

Masaya Furukawa

Tsutomu Kaneta

Kazuto Shiraishi

A separation membrane comprising a soluble aromatic polysulfone having the formula --(X--Y)--, wherein X and Y comprise the constituent unit shown below, and the inherent viscosity (.eta..sub.inh) based on the value of a solution of 0.5 g of the polysulfone dissolved in 100 ml of N-methyl-2-pyrrolidone measured at 30.degree. C. is 0.4 or more: ##STR1## wherein R.sub.1 -R.sub.4 are each either H, CH.sub.3 or C.sub.2 H.sub.5, and R.sub.5 -R.sub.6 are each either H, Cl, or NO.sub.2.

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Kawasaki, Japan

Takerou Teramoto