Membrane with increased surface area
AssigneeSartorius Stedim Biotech GmbH
InventorsAshok Mundrigi, Jahnavi Gowda, Ramesh Mundlamuri, Thomas Loewe, Holger Linne, Sebastian Handt
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Abstract
The present invention relates to a micro-porous filtration membrane with performance enhancing projections as well as a method for producing the same.
Claims15
A micro-porous filtration membrane comprising a plurality of three-dimensional projections extending from a second main surface of the membrane and originating from the micro-porous filtration membrane itself in a flat disc shape characterized in that the micro-porous structure of the material constituting the filtration membrane is substantially not compressed and in that the three-dimensional projections are formed by stamping from a first main surface of the membrane opposite to the second main surface of the membrane upon which corresponding recesses are formed on the first main surface, wherein the three-dimensional projection on the second main surface of the membrane is the negative stamping shape of the positive stamping shape of the three-dimensional projection stamped from the first main surface of the membrane, wherein the microporous filtration membrane is a multi-layer membrane comprising at least two different membrane layers having different pore sizes such that a first membrane layer on the non-filtrate side has a larger pore size compared to a second membrane layer on the filtrate side, wherein at least one of the first or second membrane layers comprises a plurality of said three dimensional projections, and wherein said at least one of the first or second membrane layers comprising the plurality of said three dimensional projections is made from polyether sulfone or polyvinylidene difluoride or a cellulose derivate or a combination thereof.
A micro-porous, multi-layer filtration membrane comprising:
- at least one first porous membrane layer comprising first main surface and a second main surface, a plurality of three-dimensional projections extending from the second main surface of the at least one first porous membrane layer, and a plurality of corresponding recesses present on the first main surface of the at least one first porous member layer, wherein the three-dimensional projections and corresponding recesses of the at least one first porous membrane layer are formed by stamping the first main surface opposite to the second main surface of the at least one first porous membrane layer;
- and
- at least one second porous membrane layer disposed on the first main surface or on the second main surface of the at least one first porous membrane layer,
- wherein the at least one first porous membrane layer and the at least one second porous membrane layer have different pore sizes such that the at least one first porous membrane layer or the at least one second porous membrane layer on a non-filtrate side of the filtration membrane has a larger pore size compared to the other membrane layer on a filtrate side of the filtration membrane, wherein the filtration membrane has a micro-porous structure that is substantially not compressed, and wherein said at least one of the first or second membrane layers comprising the plurality of said three dimensional projections is made from polyether sulfone or polyvinylidene difluoride or a cellulose derivate or a combination thereof.
Dependencies are inferred from the claim text.