C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
117/88.5
C08J 9/34 (2006.01) B01D 69/02 (2006.01) B01D 69/12 (2006.01)
Patent
CA 1182959
ABSTRACT There is disclosed an improved reverse osmosis membrane which is particularly useful in water purification. This membrane includes a thin, active layer of a relatively inert, film forming, polymer, which is capable of dissolving a limited amount of water. The active layer is used in association with a porous support. This active layer is disposed on a hydrogen layer which serves to facilitate the movement of water away from the active layer generally to- ward the pores in the support. The support used is an asymmetric layer or membrane in which the porosity increases with the distance from the hydrogen layer. The complete membrane may be made by employing solvent solutions which are successively applied to the support layer or membrane and from which the solvent is removed. The film forming polymer may be selected from the group consisting of hydro- philic, partially hydrolyzed polyvinyl ester, epoxy and phenolic polymers. An active layer of cellulose triacetate in association with a porous polyvinylidene fluoride is exemplary of a reverse osmosis membrane.
386782
Brunswick Corporation
Meredith & Finlayson
LandOfFree
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