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AssigneeTerumo Kabushiki Kaisha
InventorsNoriyuki Koyama, Shinsuke Yokomati, Yasushi Nemoto, Makoto Ohnishi
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A hydrophilic porous membrane is obtained by covering porous membrane substrate with a non-ionic, amino-acid-based or non-ionic fluorine-based surface active agent. For the covering, the porous membrane substrate is immersed in a solution containing the surface active agent and then drying the membrane substrate. A different hydrophilic porous membrane is obtained by providing the surfaces of a porous membrane substrate and inner pore surfaces with a polar group and then covering the membrane substrate with a hydrophilic polymer film. For this covering, after introduction of the polar group to the surfaces of the porous membrane substrate and inner pore surfaces, the membrane substrate is immersed in a solution containing a hydrophilic substance and then dried. In a liquid filter using any of these hydrophilic porous membrane, the porous membrane is disposed in a housing such as to divide the housing inner space into two sub-spaces respectively communicating with a liquid inlet and a filtrate outlet provided on the housing.
A hydrophilic porous membrane comprising a porous membrane substrate based on fluorine having innumerable pores, surfaces of said porous membrane substrate and inner pore surfaces being covered by a non-ionic surface active agent based on fluorine, wherein the hydrophilic porous membrane contains 7.5 to 12.5% by weight of said non-ionic surface active agent based on fluorine with respect to the weight of said porous membrane substrate based on fluorine.
A hydrophilic porous membrane comprising a hydrophobic porous membrane substrate with innumerable pores, surfaces of said porous membrane substrate and inner porous surfaces being provided with a polar group, said porous membrane substrate being covered by a hydrophilic polymer film.
Dependencies are inferred from the claim text.