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US 5,158,721 AGranted
Porous membrane formed from interpenetrating polymer network having hydrophilic surface
AssigneeMillipore Corporation
InventorsAnthony E. Allegrezza, Jr., Ellen C. Bellantoni
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Abstract
A porous membrane is formed from an interpenetrating polymer network of a hydrophobic polymer and a polymerized and crosslinked hydrophilic monomeric composition. A solution of the polymer and monomeric composition is cast, exposed to ultraviolet radiation, coagulated and dried. The resulting dried membrane is annealed in order to render its surface hydrophilic.
Claims7
The process for forming a porous membrane having a water wettable surface formed of an interpenetrating polymer network of a semi-crystalline hydrophobic polymer, and a cross-linked hydrophilic second polymer which comprises:
- (a) forming a solution of said hydrophobic polymer, a monomeric composition precursor of said hydrophilic polymer, a crosslinking agent for said monomeric composition and a photoinitiator for said monomer composition,
- (b) casting said solution on a substrate,
- (c) exposing said cast solution to ultraviolet radiation to polymerize and cross-link said monomeric composition,
- (d) coagulating said cast solution,
- (e) removing solvent from said coagulated solution to form a dried porous membrane, and
- (f) annealing said dried porous membrane to render the surface of said membrane water wettable.
3 more elements
Dependencies are inferred from the claim text.