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US 11,499,016 B2Granted
Polysulfone-urethane copolymer, membranes and products incorporating same, and methods for making and using same
AssigneeFresenius Medical Care Holdings, Inc.
InventorsGeoffrey Russell, James White, Jiunn Teo, Kevin Hudson, Monica Hall, Praveen Kosaraju
Life of this patent
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Abstract
A polysulfone-urethane copolymer is disclosed, which can be used as a membrane polymer, e.g., a matrix polymer, a pore forming agent, or both, while enhancing a membrane's blood compatibility. Methods are disclosed for forming the copolymer and incorporating the copolymer in membranes (e.g., spun hollow fibers, flat membranes) and other products.
Claims21
A method for preparing a polysulfone-urethane copolymer, comprising
- 1) reacting an aromatic diol and a dihalodiphenyl sulfone to form a polysulfone block, and control the stoichiometry so that the polysulfone block has dihalodiphenyl end groups,
- 2) reacting at least one oligo- or polyurethane block with an aromatic dihydroxyl compound which end caps the at least one oligo- or polyurethane block to form an encapped oligo- or polyurethane block, and
- 3) reacting the polysulfone block and the end-capped oligo- or polyurethane block to form the polysulfone-urethane copolymer.
Dependencies are inferred from the claim text.