초록 ▼

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,

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.

대표청구항 ▼

[ What is claimed is:] [1.] A charge-modified integral polymer membrane, said membrane comprising a hydrophobic polymer, said membrane being initially hydrophobic, said initially hydrophobic membrane being rendered hydrophilic by charge-modification, said charge modification resulting from contactin

[ What is claimed is:] [1.] A charge-modified integral polymer membrane, said membrane comprising a hydrophobic polymer, said membrane being initially hydrophobic, said initially hydrophobic membrane being rendered hydrophilic by charge-modification, said charge modification resulting from contacting said membrane with at least one polymeric wetting agent, said wetting agent comprising an agent selected from the group consisting of polyvinylalcohols, hydroxypropylcellulose, hydroxypropylmethylcellulose, and methylcellulose, said charge-modification further resulting from crosslinking to said membrane at least one polymeric cationic charge-modifying agent.