Hydrophilic membranes
AssigneeW. L. Gore & Associates, Inc.
InventorsDilip R. Abayasekara, Robert L. Henn
Life of this patent
Estimating the term…
Abstract
Normally hydrophobic fluoropolymer porous membranes having continuous pores are rendered hydrophilic by coating the pore interior with a mixture of at least one fluoroaliphatic surfactant and at least one hydrophilic but substantially water-insoluble polyurethane.
Claims7
A water-permeable hydrophilic membrane comprising a porous fluoropolymeric membrane having continuous pores from one side to the other, in which the membrane interior is coated with a mixture of a fluoroaliphatic surfactant and a hydrophilic, substantially water insoluble polyurethane.
Process for preparing a hydrophilic membrane which comprises subjecting a hydrophilic fluoropolymeric membrane having continuous pores from one side to the other to a solution of a fluoroaliphatic surfactant and a hydrophilic, substantially waterinsoluble polyurethane in an organic solvent and then drying the resulting membrane to remove solvent.
Dependencies are inferred from the claim text.