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US 11,896,932 B2Granted
Fluorinated filter membrane, filters, and methods
AssigneeEntegris, Inc.
InventorsJames A. Hamzik, Nicholas Josef Filipancic
Life of this patent
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Abstract
Described are filtration membranes that include a porous fluoropolymer membrane and thermally stable ionic groups; filters and filter components that include these filtration membranes; methods of making the filtration membranes, filters, and filter components; and method of using a filtration membrane, filter component, or filter to remove unwanted material from fluid.
Claims15
A filter component comprising:
- a filtration membrane comprising
- a porous fluoropolymer membrane,
- a hydrophilic crosslinked coating placed directly on the porous fluoropolymer membrane, wherein the hydrophilic crosslinked coating comprises thermally stable ionic groups, at least one ionic group-containing reactive compound, and at least one nonionic group-containing reactive compound, and
- an edge;
- and
- a fluoropolymer end piece,
- wherein the edge of the filtration membrane is potted to the end piece with a melt-processable fluoropolymer to provide a fluid-tight seal along the edge, and
- wherein, after exposure of the filtration membrane to a temperature of at least 240 degrees Celsius for a time sufficient to soften the melt-processable fluoropolymer so that the edge of the filtration membrane is potted to the end piece, the filtration membrane contains at least 50 percent of an amount of ionic groups present on the filtration membrane before the exposure.
5 more elements
A filter component comprising:
- a filtration membrane comprising:
- a porous fluoropolymer membrane,
- thermally stable ionic groups, at least one ionic group-containing reactive compound, and at least one nonionic group-containing reactive compound grafted to the porous fluoropolymer membrane, and
- an edge;
- and
- a fluoropolymer end piece, wherein the edge of the filtration membrane is potted to the end piece with a melt-processable fluoropolymer to provide a fluid-tight seal along the edge, and
- wherein, after exposure of the filtration membrane to a temperature of at least 240 degrees Celsius for a time sufficient to soften the melt-processable fluoropolymer so that the edge of the filtration membrane is potted to the end piece, the filtration membrane contains at least 50 percent of an amount of ionic groups present on the filtration membrane before the exposure.
4 more elements
Dependencies are inferred from the claim text.