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

1989-05-01

1993-04-20

Spear, Frank

Liquid purification or separation

Filter

Supported, shaped or superimposed formed mediums

21050036, B01D 7134

Patent

active

052039978

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: 4113912 (1978-09-01), Okita
patent: 4203847 (1980-05-01), Grandine
patent: 4280970 (1981-07-01), Kesting
patent: 4399035 (1983-08-01), Hohmi et al.
patent: 4470859 (1984-09-01), Benezra et al.
patent: 4501793 (1985-02-01), Sarada
patent: 4776959 (1988-10-01), Kasai et al.
patent: 4844811 (1989-07-01), Gotlieb et al.

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