Porous filter media and membrane support means
AssigneeThe Dow Chemical Company
InventorsRitchie A. Wessling, Larry D. Yats, Alan F. Burmester
Life of this patent
Estimating the term…
Abstract
A method for filtering liquid or gaseous materials where the filtration is conducted with a porous filter media prepared from an aqueous wet-laid, lofted fiber-reinforced composite sheet, the composite sheet comprising a heat fusible polymer, reinforcing fibers and a binder. The random fiber composite sheet can be selectively lofted or recompressed to form filter media having variable porosity. Also, a membrane support means prepared by applying or treating the fiber-reinforced composite sheet with a discriminating membrane layer.
Claims14
A method for preparing a composite membrane comprising the application or formation of a membrane discriminating layer on at least one major surface of a fiber-reinforced composite sheet and heating and expanding said fiber-reinforced composite sheet to obtain a predetermined degree of porosity either before or after application of the membrane discriminating layer.
A supported membrane comprising a membrane discriminating layer on at least one major surface of a lofted fiber-reinforced porous composite sheet.
Dependencies are inferred from the claim text.