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US 12,409,422 B2Granted
Composite hollow fiber and related methods and products
AssigneeEntegris, Inc.
InventorSina Bonyadi
Life of this patent
Estimating the term…
Abstract
Described are composite hollow fibers filter membranes that include a porous polymeric hollow fiber support and a filter layer; methods of making the composite hollow fibers and using the composite hollow fibers as a filter membrane; methods of making a filter component or filter from the composite hollow fiber, and filter components and filters that contain the composite hollow fibers as filter membranes.
Claims10
A composite hollow fiber filter membrane comprising:
- a polymeric, microporous, hollow fiber support comprising:
- an outer surface,
- an inner surface,
- a thickness extending between the outer surface and the inner surface, and micropores;
- and
- a porous polymeric filter layer comprising coagulated polymer contacting the outer surface,
- wherein the porous polymeric filter layer includes pores having an average pore size that is smaller than an average pore size of the micropores of the hollow fiber support,
- wherein the hollow fiber support is thicker than the porous polymeric filter layer, and
- wherein the porous polymeric filter layer is resistant to solvent selected from the group consisting of propylene glycol methyl ether (PGME), propylene glycol methylether acetate (PGMEA), and cyclohexanone,
- wherein the composite hollow fiber filter membrane has a liquid flux of at least 30 LMH/bar and a bubble point in a range from 50-500 psi measured using ethoxy-nonafluorobutane (HFE 7200) at a temperature of 25 degrees Celsius.
7 more elements
A method of preparing a composite hollow fiber filter membrane comprising a polymeric, microporous, hollow fiber support and a porous polymeric filter layer, the method comprising:
- placing a polymer solution coating on an outer surface of the polymeric, microporous, hollow fiber support, the polymer solution coating comprising polymer dissolved in solvent, and
- contacting the polymer solution coating with coagulation solution to cause dissolved polymer of the polymer solution coating to form a layer of coagulated polymer on the outer surface, the layer of coagulated polymer contacting the outer surface and penetrating not more than partially into a thickness of the polymeric, microporous, hollow fiber support,
- wherein the porous polymeric filter layer includes pores having an average pore size that is smaller than an average pore size of micropores of the polymeric, microporous hollow fiber support,
- wherein the polymeric, microporous, hollow fiber support is thicker than the porous polymeric filter layer, and
- wherein the porous polymeric filter layer is resistant to solvent selected from the group consisting of propylene glycol methyl ether (PGME), propylene glycol methylether acetate (PGMEA), and cyclohexanone,
- wherein the composite hollow fiber filter membrane has a liquid flux of at least 30 LMH/bar and a bubble point in a range from 50-500 psi measured using ethoxy-nonafluorobutane (HFE 7200) at a temperature of 25 degrees Celsius.
3 more elements
A filter comprising a composite hollow fiber filter membrane comprising:
- a polymeric, microporous, hollow fiber support comprising:
- an outer surface,
- an inner surface,
- a thickness extending between the outer surface and the inner surface, and micropores;
- and
- a porous polymeric filter layer comprising coagulated polymer contacting the outer surface,
- wherein the porous polymeric filter layer includes pores having an average pore size that is smaller than an average pore size of the micropores of the polymeric, microporous, hollow fiber support,
- wherein the polymeric, microporous, hollow fiber support is thicker than the porous polymeric filter layer, and
- wherein the porous polymeric filter layer is resistant to solvent selected from the group consisting of propylene glycol methyl ether (PGME), propylene glycol methylether acetate (PGMEA), and cyclohexanone,
- wherein the composite hollow fiber filter membrane has a liquid flux of at least 30 LMH/bar and a bubble point in a range from 50-500 psi measured using ethoxy-nonafluorobutane (HFE 7200) at a temperature of 25 degrees Celsius.
7 more elements
Dependencies are inferred from the claim text.