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US 8,011,517 B2Granted
Composite membranes with performance enhancing layers
AssigneeInternational Business Machines Corporation
InventorsRobert David Allen, James Lupton Hedrick, Young-Hye Na, Alshakim Nelson, Ratnam Sooriyakumaran
Life of this patent
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Abstract
A composite membrane includes a filtration membrane with a surface; and a layer on the surface of the filtration membrane. The layer includes a polymer including a poly(ethylene glycol) moiety cross-linked with an ammonium salt or a precursor of an ammonium salt.
Claims11
A method for making a composite membrane, comprising:
- applying a coating composition to a surface of a filtration membrane, wherein the coating composition comprises:
- a hydrophilic compound (A) selected from at least one of PEG-methacrylates, PEG-acrylates, PEG-diacrylate, PEG-dimethacrylate, or PEG-diepoxides;
- a polymerizable compound (B) selected from monomers with the formula [(RNR1R2R3)+X−], wherein R is a (meth)acryl functional group, N is nitrogen, R1-R3, which may be the same or different, may be hydrogen or alkyl, and X is a halide, wherein the ratio by weight of the compound (A) to the compound (B) is about 1:1 to about 3:1;
- and
- about 50 wt % to about 80 wt % water;
- and
- curing the composition to form a layer on the membrane.
4 more elements
A composite membrane comprising:
- a filtration membrane selected from the group consisting of microfiltration (MF), ultrafiltration (UF), nanofilitration (NF), reverse osmosis (RO), forward osmosis (FO), and combinations thereof;
- a layer on the membrane, wherein the layer comprises the cured reaction product of:
- a hydrophilic compound (A) selected from at least one of PEG-methacrylates, PEG-acrylates, PEG-diacrylate, PEG-dimethacrylate, or PEG-diepoxides;
- a polymerizable compound (B) selected from monomers with the formula [(RNR1R2R3)+X−], wherein R is a (meth)acryl functional group, N is nitrogen, R1-R3, which may be the same or different, may be hydrogen or alkyl, and X is a halide, wherein the ratio by weight of the compound (A) to the compound (B) is about 1:1 to about 3:1;
- and
- about 50 wt % to about 80 wt % water.
3 more elements
Dependencies are inferred from the claim text.