Hydrophilic porous membrane, method of manufacturing the same an

Details Hydrophilic porous membrane, method of manufacturing the same an Hydrophilic porous membrane, method of manufacturing the same an

1992-12-23

1994-01-18

Spear, Frank

Coating processes

Foraminous product produced

Microporous coating

210490, 21050036, B01D 6700

Patent

active

052798569

ABSTRACT:
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.

REFERENCES:
patent: 4203847 (1980-05-01), Grandine, 2nd
patent: 4289600 (1981-09-01), Lazarz et al.
patent: 4399035 (1983-08-01), Nohmi et al.
patent: 4844811 (1989-07-01), Gotlieb et al.

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