Composite porous membranes
AssigneeHoechst Celanese Corporation
InventorKaren A. Donato
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Abstract
The composite membrane is disclosed having a microporous support which is coated with an aqueous polyeurethane dispersion composition wherein the microporous support is surface treated. A process for making and a process for using the membrane is also disclosed.
Claims3
An improved membrane delay process comprising the steps of (i) feeding a fluid to be delayed into a membrane containing apparatus and (ii) delaying the passage of the fluid across the membrane, the improvement comprising the use of a composite membrane having substantially no pore filling, said membrane comprising a microporous support and an aqueous dispersed polyeurethane coated thereon wherein the aqueous dispersed polyeurethane does not penetrate into said pores.
Dependencies are inferred from the claim text.