Modified membranes
First Claim
1. A method of preparing a porous polymeric membrane, the method comprising the steps of:
- blending a reactivity modifying agent with a polymeric membrane forming material whereby a blended material is obtained, wherein the reactivity modifying agent comprises an anhydride; and
casting a porous polymeric membrane from the blended material.
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Accused Products
Abstract
A porous polymeric membrane formed from a blend of a polymeric membrane forming material, such as polyvinylidene fluoride or polysulfone and a polymeric reactivity modifying agent adapted to modify the surface active properties of the porous polymeric membrane. The reactivity modifying agent is preferably a linear polymeric anhydride, such as poly(alkyl vinyl ether/maleic anhydride). The surface activity modifications include modification of the hydrophilicity/hydrophobicity balance of the membrane, or hydrolysis followed by reaction with a polyamine to form a crosslinked polyamide layer. Such modified membranes have use as reverse osmosis membranes.
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Citations
43 Claims
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1. A method of preparing a porous polymeric membrane, the method comprising the steps of:
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blending a reactivity modifying agent with a polymeric membrane forming material whereby a blended material is obtained, wherein the reactivity modifying agent comprises an anhydride; and
casting a porous polymeric membrane from the blended material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 43)
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37. A method of modifying a surface of a porous polymer membrane comprising the steps of:
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i) blending a reactivity modifying agent comprising an anhydride with a polymeric membrane forming material; and
ii) casting a modified membrane. - View Dependent Claims (38, 39, 40, 41, 42)
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Specification