Microfiltration membrane
AssigneeEMD Millipore Corporation
InventorsJijun Ge, Xiaozhu Zhou
Life of this patent
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Abstract
The present application relates to a multizone, unsupported, microporous, high throughput membrane. The membrane includes a first microporous zone, a second microporous zone, and a third microporous zone, where the third microporous zone is positioned between the first and second microporous zones, with the first, second, and third microporous zones being integral with one another. Further aspects of the present application include a process for making the membrane and a filtration cartridge with the membrane of the present application.
Claims26
A multizone, unsupported, microporous, high throughput filtration membrane having a bubble point (in psi) of from about 15 to 50 and a breaking strain of at least 20%, comprising:
- a first microporous zone which is symmetric or asymmetric, wherein pore sizes range from 0.02 to 20 μm;
- a second microporous zone which is symmetric or asymmetric, wherein pore sizes range from 0.05 to 200 μm;
- and
- a third microporous zone which is asymmetric, wherein pore sizes range from 0.01 to 0.8 μm, wherein the third microporous zone is positioned between the first and second microporous zones with the first, second, and third microporous zones being integral with one another and wherein the membrane has a throughput (in L/m2), when measured using whey broth, which is greater than −11.65x+1088.5, where x is the bubble point (in psi), or a throughput, when using EMD Soy broth, which is greater than −20.23x+1369.4, where x is the bubble point (in psi).
A multizone, unsupported, microporous, high throughput filtration membrane comprising:
- a first microporous zone which is symmetric or asymmetric, wherein pore sizes range from 0.02 to 20 μm;
- a second microporous zone which is symmetric or asymmetric, wherein pore sizes range from 0.05 to 200 μm;
- and
- a third microporous zone which is asymmetric, wherein pore sizes range from 0.01 to 0.8 μm, wherein the third microporous zone is positioned between the first and second microporous zones with the first, second, and third microporous zones being integral with one another and wherein the first, second, and/or third microporous zones comprise a blend of a first polymer selected from the group consisting of PVDF, polyamides, polyimides, polyether sulphones, polysulphones, polyaryl sulphones, PVC, PET, polycarbonates, cellulose, regenerated cellulose, cellulose esters, polystyrenes, polyetherimides, acrylic polymers, methacrylic polymers, and copolymers of acrylic or methacrylic polymers, and a second polymer wherein the second polymer is selected from one or more hydrophilic polymers from the group consisting of polyacrylic acid, polyvinylalcohol, polyvinylacetate, polyvinylpyrrolidone, polyethyleneglycol, polyvinylpyridine, polyethyleneimine, and polyoxazoline and wherein the membrane has a breaking strain of at least 20%, and has a throughput (in L/m2), when measured using whey broth, which is greater than −11.65x+1088.5, where x is a bubble point (in psi), or a throughput, when using EMD Soy broth, which is greater than −20.23x+1369.4, where x is a bubble point (in psi).
An unsupported, microporous, high throughput filtration three-layer membrane having an asymmetric first microporous zone, wherein pore sizes range from 0.02 to 20 μm;
- a second asymmetric microporous zone, wherein pore sizes range from 0.05 to 200 μm;
- and
- a third asymmetric microporous zone, wherein pore sizes range from 0.01 to 0.8 μm, with a breaking strain of at least 20%, and having a bubble point (in psi) of from about 15 to 50, wherein the membrane has a throughput (in L/m2), when measured using whey broth, which is greater than −11.65x+1088.5, where x is the bubble point (in psi), or a throughput, when using EMD Soy broth, which is greater than −20.23x+1369.4, where x is the bubble point (in psi).
Dependencies are inferred from the claim text.