A strong water-permeable thin composite membrane

B - Operations – Transporting – 01 – D

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Details

B01D 69/12 (2006.01) B01D 69/10 (2006.01) B01D 69/14 (2006.01) B01D 71/32 (2006.01)

Patent

CA 2208455

The present invention is directed to strong water-permeable thin composite membranes comprised of a microporous polymeric film component and a hydrogel material component. The microporous polymeric film component functions primarily to provide mechanical support to the hydrogel material component. The film component also functions to filter large molecular weight solutes and cells. Preferably, the microporous polymeric film component is in the form of a laminate of two or more layers of microporous polymeric film oriented in different directions. The microporous polymeric film component has void spaces impregnated with the hydrogel material component to form an interpenetrating network therewith. The hydrogel material component provides a means whereby movement of water, aqueous fluids, and aqueous solutes through the composite membrane is controlled. Permeable composite membranes of the present invention have a thickness less than about 100 microns, preferably less than about 50 microns, more preferably less than about 5 microns, and most preferably less than about 1.0 micron.

La présente invention concerne des membranes composites fines et résistantes perméables à l'eau constituées d'un film polymère microporeux et d'un hydrogel. La fonction première du film polymère microporeux est de fournir un support mécanique à l'hydrogel. Le film a aussi pour fonction de filtrer les solutés et cellules de poids moléculaire élevé. De préférence, le film polymère microporeux se présente sous la forme d'un stratifié formé de deux ou plusieurs couches de film polymère microporeux orientées dans des directions différentes. Le film polymère microporeux comporte des espaces interstitiels imprégnés d'hydrogel avec lequel il constitue un réseau interconnecté. L'hydrogel permet de réguler le passage d'eau, de fluides aqueux et de solutés aqueux à travers la membrane composite. Les membranes composites perméables de la présente invention ont une épaisseur inférieure à environ 100 microns, de préférence inférieure à environ 50 microns, de préférence encore inférieure à environ 5 microns, et idéalement inférieure à environ 1,0 micron.

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