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US 6,565,748 B1Granted
Cationically charge-modified membranes
AssigneePall Corporation
InventorsI-fan Wang, Robert Zepf
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AssigneePall Corporation
InventorsI-fan Wang, Robert Zepf
Estimating the term…
The present invention relates to cationically charge-modified membranes and methods of preparing such membranes. In one major aspect of the invention, the membranes are hydrophobic membranes that are treated with one or more polymeric wetting agents to render the membranes substantially hydrophilic, followed by treatment with one or more charge-modifying agents, the agents causing the membranes to possess a fixed formal positive charge. In another major aspect of the invention, a cationic membrane is formed from casting in a film a mixed polymer solution comprising a sulfone polymer and a copolymer of vinylpyrrolidone and a cationic imidazolinium compound, and quenching the film in an aqueous bath to produce a coagulated membrane. The membrane can be further cationically charge-modified with one or more charge-modifying agents.
A charge-modified polymer membrane, said membrane comprising a hydrophobic polymer, said membrane being rendered hydrophilic by charge-modification, said charge modification resulting from contacting said membrane with at least one polymeric wetting agent and at least one cationic charge modifying agent comprising a polyamine free of any epoxide or epichlorohydrin chemical crosslinking substituents, said charge-modification further resulting from crosslinking to said membrane said cationic charge-modifying agent, wherein said polymeric wetting agent is polyvinylalcohol or a cellulosic polymer comprising a hydrophilic functional group.
A charge-modified polymer membrane, said membrane comprising a hydrophobic polymer, said membrane being rendered hydrophilic by charge-modification, said charge modification resulting from contacting said membrane with at least one polymeric wetting agent and at least one cationic charge modifying agent comprising a polyamine free of any epoxide or epichlorohydrin chemical crosslinking substituents, said charge-modification further resulting from crosslinking to said membrane said cationic charge-modifying agent, wherein said polymer is a sulfone polymer, said sulfone polymer being selected from the group consisting of polysulfone, polyarylsulfone, and polyethersulfone.
A charge-modified polymer membrane, said membrane comprising a hydrophobic polymer, said membrane being rendered hydrophilic by charge-modification, said charge modification resulting from contacting said membrane with at least one polymeric wetting agent and at least one cationic charge modifying agent comprising a polyamine free of any epoxide or epichlorohydrin chemical crosslinking substituents, said charge-modification further resulting from crosslinking to said membrane said cationic charge-modifying-agent, wherein said membrane comprises a cast polymer membrane.
A charge-modified polymer membrane, said membrane comprising a hydrophobic polymer, said membrane being rendered hydrophilic by charge-modification, said charge modification resulting from contacting said membrane with at least one polymeric wetting agent and at least one cationic charge modifying agent comprising a polyamine free of any epoxide or epichlorohydrin chemical crosslinking substituents, said charge-modification further resulting from crosslinking to said membrane said cationic charge-modifying agent, wherein said membrane comprises a melt-blown polymer membrane.
A method of preparing a charge-modified polymer membrane, comprising:
A method of preparing a charge-modified polymer membrane, comprising:
A method of preparing a charge-modified polymer membrane, comprising:
Dependencies are inferred from the claim text.