Porous filter media and membrane support means
AssigneeThe Dow Chemical Company
InventorCharles F. Diehl
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.
Claims11
A method for filtering fluids comprising passing fluid containing filterable material through at least one porous filter medium comprising a densified random fiber composite sheet which has been expanded, by heating, in a direction normal to the plane of the sheet and which comprises a heat fusible polymer, reinforcing fibers, and a binder.
Dependencies are inferred from the claim text.