Hydrophobic porous membranes and process for the manufacture the

Details Hydrophobic porous membranes and process for the manufacture the Hydrophobic porous membranes and process for the manufacture the

1993-07-22

1995-04-04

Dawson, Robert A.

Liquid purification or separation

Filter

Supported, shaped or superimposed formed mediums

21050035, 21050036, 210506, 427245, 4273935, 264 451, 264 455, 521 31, 521 53, B01D 2900

Patent

active

054034833

ABSTRACT:
Disclosed is a hydrophobic porous membrane with a polymer having fluorinated alkyl side chains held in physical contact with the surface of a polyolefin porous membrane in which the fluorinated alkyl side chains of the polymer are crystallized, as well as its manufacturing process. Also disclosed is a hydrophobic porous membrane with a fluorinated crosslinked polymer from a fluorinated monomer with a fluorinated alkyl side chain and a crosslinking monomer held in physical contact with the surface of a polyolefin porous membrane, in which the fluorinated alkyl side chains of the fluorinated crosslinked polymer are crystallized, as well as its manufacturing process. These porous membranes use polyolefin porous membranes having a higher mechanical strength and lower costs than the fluorinated polymer porous membranes and still provide superior hydrophobicity over polytetrafluoroethylene type membranes.

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Database WPI, Derwent Publications Ltd., AN-87-353185, JP-A-62 257 844, Nov. 10, 1987.

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