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US 2020/0222858 A1Published application
Filter membrane and device
AssigneeGambro Lundia AB
InventorsRalf MENDA, Evelyn HARTMANN, Carina ZWEIGART, Bernd BAUER, Michael SCHUSTER
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Abstract
The present disclosure relates to a microporous hollow fiber filter membrane having a large inner diameter and a thin wall. The fiber can be used for sterile filtration of liquids or removal of particles from liquids. The disclosure further relates to a method for producing the membrane and a filter device comprising the membrane.
Claims22
A porous hollow fiber membrane comprising i) polyethersulfone;
- ii)polyvinylpyrrolidone;
- and iii) a polymer bearing ammonium groups, wherein the polymer bearing ammonium groups is selected from the group consisting of polyalkyleneoxides bearing ammonium groups, polyvinylpyridines bearing ammonium groups, and copolymers of vinylpyridine and styrene bearing ammonium groups;
- wherein the membrane has a sponge-like structure, and
- wherein the membrane comprises a mean flow pore size, determined by capillary flow porometry, which is larger than about 0.2 μm.
1 more element
A continuous solvent phase inversion spinning process for preparing a porous hollow fiber membrane, said process comprising the steps of
- a) dissolving i) at least one polyethersulfone, ii) at least one polyvinylpyrrolidone, and iii) at least one polymer bearing ammonium groups in N-methyl-2-pyrrolidone to form a polymer solution;
- b) extruding the polymer solution through an outer ring slit of a nozzle with two concentric openings into a precipitation bath;
- simultaneously
- c) extruding a center fluid through the inner opening of the nozzle;
- d) washing the membrane obtained;
- and subsequently
- e) drying the membrane;
- wherein the polymer solution comprises i) between about 15 wt % to about 20 wt %, relative to the total weight of the polymer solution, of polyethersulfone;
- ii) from 10 wt % to 15 wt %, relative to the total weight of the polymer solution, of polyvinylpyrrolidone;
- and iii) between about 0.03 wt % to about 2 wt %, relative to the total weight of the solution, of at least one polymer bearing ammonium groups, wherein the polymer bearing ammonium groups is selected from the group consisting of polyalkyleneoxides bearing ammonium groups, polyvinylpyridines bearing ammonium groups, and copolymers of vinylpyridine and styrene bearing ammonium groups.
7 more elements
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Dependencies are inferred from the claim text.