Fluoropolymers and membranes comprising fluoropolymers (II)
AssigneePall Corporation
InventorsFrank Okezie Onyemauwa, Hassan Ait-Haddou
Life of this patent
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Abstract
Disclosed are a copolymer, porous membranes made from the copolymer, and a method of treating fluids to remove metal ions using the porous membranes, for example, from fluids originating in the microelectronics industry, wherein the copolymer includes monomeric units I and II, wherein monomeric unit I is of the formula A-X—CH2—B, wherein A is Rf—(CH2)n, Rf is a perfluoro alkyl group of the formula CF3—(CF2)x—, wherein x is 3-12, n is 1-6, X is O or S, and B is vinylphenyl, and monomeric unit II is vinylpyridine.
Claims14
A porous membrane comprising a copolymer disposed on a porous polymeric support, wherein the porous polymeric support is selected from PVC/PAN, polysulfone, polyethersulfone, PET, PPS, PPSU (polyphenyl sulfone), PTFE, PVF (polyvinyl fluoride), PCTFE (polychlorotrifluoroethylene), FEP (fluorinated ethylene-propylene), ETFE (polyethylenetetrafluoroethylene), ECTFE (poly ethylenechlorotrifluoroethylene), PFPE (perfluoropolyether), PFSA (perfluorosulfonic acid), and perfluoropolyoxetane,
- wherein the copolymer is a copolymer of monomeric units I and II,
- wherein monomeric unit I is of the formula
- wherein A is Rf—(CH2)n, Rf is a perfluoro alkyl group of the formula CF3—(CF2)x—, wherein x is 3-12, n is 1-6, and X is S,
- and monomeric unit II is vinylpyridine;
- wherein the porous membrane has a critical wetting surface tension (CWST) of 23 dynes/cm or less.
Dependencies are inferred from the claim text.