| 摘要 |
PROBLEM TO BE SOLVED: To provide an amphoteric ionic polyketone porous membrane useful as a filter for filtration that has heat resistance, chemical resistance and organic solvent resistance and besides, can remove both cationic and anionic impurities, and to provide a filter in which the polyketone porous membrane is used as the filter medium.SOLUTION: A polyketone porous membrane is provided which is composed of polyketone comprising 1-oxo-trimethylene repeating unit represented by the following chemical formula (1), and which satisfies the following conditions: (1) the porosity is 5 to 90%; (2) the zeta potential at pH=1 to 3 is +5 mV to +80 mV; and (3) the zeta potential at pH=11 to 14 is -80 mV to -5 mV, and a filter for filtration is provided which comprises a polyketone porous membrane. |
