| 摘要 |
<p>A composite hollow fiber membrane having a composite structure comprising a thin homogeneous film sandwiched between porous support layers, wherein the ratio of the oxygen permeability to the nitrogen permeability of the film is 1.1 or higher and the change of that ratio through immersion in a chemical in accordance with JIS K 7114 is within ±10 %, and which does not leak the chemical at all even when degassed.</p> |
