Porous membrane with low steam permeability

Details Porous membrane with low steam permeability Porous membrane with low steam permeability

1997-11-21

2000-01-04

Fortuna, Ana

Liquid purification or separation

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Material

210490, 21050042, 21050038, 96 4, 96 7, 96 11, B01D 2900

Patent

active

06010628&

ABSTRACT:
A membrane for dry metal-air chemical current sources which posses high oxygen permeability and provide high barrier properties toward water vapor. The invention includes a semipermeable porous asymmetric membrane based on vinylidene fluoride polymer comprising copolymer of vinylidene fluoride with tetrafluoroethylene at 8-70% mass content of tetrafluoroethylene, the membrane pore size being 0.0015-0.030 .mu.m, and the volume porosity being 35-60%, wherein said asymmetric membrane has a more dense porous structure on one side of the membrane than on another side of said membrane, and wherein the water vapor permeability is not more than 0.178 mg/h. cm.sup.2 and the oxygen permeability is not less than 2.70 m.sup.3 /m.sup.2 atm h.

REFERENCES:
patent: 4869859 (1989-09-01), Itoh et al.
patent: 4900626 (1990-02-01), Fabre
patent: 5013339 (1991-05-01), Mahoney et al.
patent: 5354587 (1994-10-01), Abayasekara
Patent Abstracts of Japan, vol. 17, No. 145, Mar. 24, 1993 & JP 04 312771 A (Toshiba Battery Co., LTD.), Nov. 4, 1992. Abstract.
Database WPI, Week 9218, Derwent Publications Ltd., London, GB; AN 92-148409, XP002078746 & SU 1 327 518 A (Synth. Resin. Res. Ins.), Jul. 30, 1991. Abstract.
Database WPI, Week 9525, Derwent Publications, Ltd., London, G.B.; AN 95-188623 & JP 07 105991 A (Matsushita Denki Sangyo KK), Apr. 21, 1995. Abstract.

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