| 摘要 |
<p>A desirable reverse osmosis membrane which is particularly useful in water purification includes a thin, active layer (20) of a relatively inert, film forming, polymer which is capable of dissolving a limited amount of water, said active layer being used in association with a porous support (12). This active layer is disposed on a hydrogel layer (16) which serves to facilitate the movement of water away from the active layer generally toward the pores in the support. Preferably the support used is an asymmetric layer or membrane in which the porosity increases with the distance away from the hydrogel layer. The complete membrane can be manufactured through the use of solvent solutions which are successively applied to the support layer or membrane and from which the solvent is removed.</p> |
