Modified membranes
First Claim
1. A method of preparing a microporous polymeric membrane comprising the steps of:
- blending a polymeric membrane forming material and a reactivity modifying agent comprising polymeric anhydride in an amount such that a combined precursor to the microporous polymeric membrane forms a single phase mixture and thereby obtaining a blended material having between 3.1% and 3.4% polymeric anhydride; and
casting the microporous 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.
259 Citations
42 Claims
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1. A method of preparing a microporous polymeric membrane comprising the steps of:
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blending a polymeric membrane forming material and a reactivity modifying agent comprising polymeric anhydride in an amount such that a combined precursor to the microporous polymeric membrane forms a single phase mixture and thereby obtaining a blended material having between 3.1% and 3.4% polymeric anhydride; and casting the microporous 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, 32)
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31. A method of preparing a porous polymeric membrane, the method comprising the steps of:
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blending a polymeric membrane forming material and a polymeric anhydride into a single phase blended material; casting a porous polymeric membrane from the blended material; and chemically modifying at least a portion of the polymeric anhydride blended into the polymeric porous membrane forming material with one or more substances selected from the group consisting of tetraethylenepentamine, tris-(hydroxymethyl) aminomethane, sulfuric acid, polyethylene glycol, and calcium carbonate.
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33. A method of modifying a surface of a microporous polymer membrane comprising the steps of:
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blending a reactivity modifying agent comprising a poly (methyl vinyl ether/maleic anhydride) with a polymeric membrane forming material, wherein the reactivity modifying agent is blended in an amount such that a combined precursor to the porous polymeric membrane forms a single phase mixture; and casting the microporous membrane. - View Dependent Claims (34, 35, 36, 37, 38)
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39. A method of preparing a microporous polymeric membrane, comprising acts of:
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blending poly(methyl vinyl ether/maleic anhydride) and a polysulfone in an amount such that a combined precursor to the microporous polymeric membrane forms a single phase mixture and thereby obtaining a blended material; and casting the microporous polymeric membrane from the blended material.
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40. A method of preparing a microporous polymeric membrane, comprising acts of:
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blending poly(methyl vinyl ether/maleic anhydride) and polyvinylidene fluoride in an amount such that a combined precursor to the microporous polymeric membrane forms a single phase mixture and thereby obtaining a blended material; and casting the microporous polymeric membrane from the blended material. - View Dependent Claims (41, 42)
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Specification