Hydrophobic membrane having hydrophilic and charged surface and process
AssigneeMillipore Corporation
InventorDavid Wang
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Abstract
The surface of a hydrophobic porous substrate is modified with an interpolymeric network of a hydrophilic crosslinked polymer and a crosslinked-polyamine epichlorohydrin resin having fixed positive charges. The hydrophobic substrate is contacted with a reaction system comprising a solution of (a) monomer precursor to the hydrophilic polymer, a nonionic or cationic polymerization initiator and a crosslinking agent and (b) a precursor to the crosslinked positively charged resin. The monomer is polymerized and cross-linked by free radical polymerization followed by heating the contacted substrate to form the charged resin.
Claims16
A porous hydrophobic filter substrate having its surface modified with a coating to render the surface hydrophilic and modified with positive charges, said coating comprising an interpenetrating polymeric network comprising:
- (a) a first polymeric composition of a polyamide polyamine epichlorohydrin cationic charge modifying agent having tertiary amine or quaternary ammonium groups crosslinked in situ on said surface and
- (b) a crosslinked polymer formed from a monomer polymerized in situ on said surface with a nonionic or cationic free radical initiator and crosslinked in situ on said substrate,
- said composite porous substrate having essentially the same porous configuration as said hydrophobic porous filter substrate.
Dependencies are inferred from the claim text.