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US 11,998,878 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.
Claims18
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 that is not cured and comprises coagulated polymer precipitated onto the outer surface,
- wherein the porous polymeric filter layer has a porosity in a range from 60% to 85%,
- wherein the porous polymeric filter layer includes pores having an average pore size in a range from 10 nanometers to 8 microns,
- wherein the composite hollow fiber filter membrane exhibits a retention that exceeds 90% for monolayer coverages of 0.5%, 1.0%, 1.5%, and 2.0%,
- wherein the coagulated polymer is selected from the group consisting of polyimides, polyamides, polyamide-imides, and polysulfones,
- wherein the hollow fiber support (in the absence of the porous polymeric filter layer) has a thickness of from about 20 to 200 microns and is thicker than the porous polymeric filter layer,
- wherein the composite hollow fiber filter membrane is configured to filter a solvent selected from the group consisting of propylene glycol methyl ether (PGME), propylene glycol methylether acetate (PGMEA), and cyclohexanone, and
- wherein the porous polymeric filter layer is resistant to the solvent selected from the group consisting of propylene glycol methyl ether (PGME), propylene glycol methylether acetate (PGMEA), and cyclohexanone.
11 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 comprising a polymer selected from the group consisting of polyimides, polyamides, polyamide-imides, and polysulfones dissolved in solvent and excluding curing reagents, 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 precipitated onto the outer surface and penetrating partially into a thickness of the polymeric, microporous, hollow fiber support,
- wherein the porous polymeric filter layer has a porosity in a range from 60% to 85%,
- wherein the porous polymeric filter layer includes pores having an average pore size in a range from 10 nanometers to 8 microns,
- wherein the composite hollow fiber filter membrane exhibits a retention that exceeds 90 for monolayer coverages of 0.5%, 1.0%, 1.5%, and 2.0% %,
- wherein the polymeric, microporous, hollow fiber support (in the absence of the porous polymeric filter layer) has a thickness of from about 20 to 200 microns and is thicker than the porous polymeric filter layer,
- wherein the composite hollow fiber filter membrane is configured to filter a solvent selected from the group consisting of propylene glycol methyl ether (PGME), propylene glycol methylether acetate (PGMEA), and cyclohexanone, and
- wherein the porous polymeric filter layer is resistant to the solvent selected from the group consisting of propylene glycol methyl ether (PGME), propylene glycol methylether acetate (PGMEA), and cyclohexanone.
5 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 that is not cured and comprises coagulated polymer precipitated onto the outer surface,
- wherein the porous polymeric filter layer has a porosity in a range from 60% to 85%,
- wherein the porous polymeric filter layer includes pores having an average pore size in a range from 10 nanometers to 8 microns,
- wherein the composite hollow fiber filter membrane exhibits a retention that exceeds 90 for monolayer coverages of 0.5%, 1.0%, 1.5%, and 2.0% %,
- wherein the coagulated polymer is selected from the group consisting of polyimides, polyamides, polyamide-imides, and poly sulfones,
- wherein the hollow fiber support (in the absence of the porous polymeric filter layer) has a thickness of from about 20 to 200 microns and is thicker than the porous polymeric filter layer,
- wherein the composite hollow fiber filter membrane is configured to filter a solvent selected from the group consisting of propylene glycol methyl ether (PGME), propylene glycol methylether acetate (PGMEA), and cyclohexanone, and
- wherein the porous polymeric filter layer is resistant to the solvent selected from the group consisting of propylene glycol methyl ether (PGME), propylene glycol methylether acetate (PGMEA), and cyclohexanone.
11 more elements
Dependencies are inferred from the claim text.