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US 8,524,794 B2Granted
Hydrophilic membranes
AssigneeSiemens Industry, Inc.
InventorsHeinz-Joachim Muller, Daniel Mullette
Life of this patent
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Abstract
A method of coating a polymer comprising the step of treating the polymer with an activating agent to produce a reactive polymer, for example treating a polymer bearing at least one X (halogen) group and at least one H with base to eliminate HX. The reactive polymer is then reacted with a reactive coating, for example PVP, preferably in the presence of an initiator like persulfate anions, to produce a coated polymer, which may be hydrophilic in nature.
Claims19
A method of making a hydrophilic asymmetric membrane comprising:
- forming an activated asymmetric membrane by exposing a surface of an asymmetric membrane comprising poly(ethylene chlorotrifluoroethylene) to an activating agent under conditions suitable for generating a reactive surface on the asymmetric membrane;
- and
- forming a hydrophilic asymmetric membrane by reacting a reactive coating on the surface of the activated asymmetric membrane.
A hydrophilic asymmetric membrane comprising:
- an asymmetric membrane comprising poly(ethylene chlorotrifluoroethylene);
- and
- a hydrophilic coating comprising polyvinylpyrrolidone (PVP) crosslinked to a surface of the asymmetric membrane.
Dependencies are inferred from the claim text.