# US 11,896,932 B2 · Fluorinated filter membrane, filters, and methods > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,896,932 B2 - Document ID: US11896932B2 - Status: Granted - Kind: B2 - Application number: 16/354,443 - Filed: 2019-03-15 - Published: 2019-09-19 - Granted: 2024-02-13 - Earliest claimed: 2018-03-15 - Assignees: Entegris, Inc. - Applicants: Entegris, Inc. - Inventors: James A. Hamzik; Nicholas Josef Filipancic - Web page: https://patentgrep.com/patent/US11896932B2 ## CPC - B01D 63/08: Flat membrane modules - B01D 67/0006: {by chemical reactions (in-situ polymerisation, polycondensation, cross-linking or reaction for manufacturing composite membranes B01D69/125)} - B01D 63/067: {with pleated membranes} - B01D 63/14: Pleat-type membrane modules - B01D 67/0088: {Physical treatment with compounds, e.g. swelling, coating or impregnation} - B01D 67/0093: {Chemical modification} - B01D 69/02: characterised by their properties - B01D 69/1216: {Three or more layers} - B01D 69/1251: {by interfacial polymerisation} - B01D 71/36: Polytetrafluoroethylene - B01D 69/105: {Support pretreatment} - B01D 2313/041: Gaskets or O-rings - B01D 2323/30: Cross-linking - B01D 2323/345: UV-treatment - B01D 2325/14: Membrane materials having negatively charged functional groups - B01D 2325/16: Membrane materials having positively charged functional groups - B01D 2325/22: Thermal or heat-resistance properties - B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28) ## 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. ## Claims ### Claim 1 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. ### Claim 2 (depends on 1) The filter component of claim 1, wherein the ionic groups comprise negatively charged ionic groups. ### Claim 3 (depends on 2) The filter component of any of claim 2, wherein the ionic groups are selected from: an ionic sulfur-containing group and an ionic phosphorus-containing group. ### Claim 4 (depends on 3) The filter component of claim 3, wherein the ionic groups are selected from a phosphonic acid and a sulfonate. ### Claim 5 (depends on 1) The filter component of claim 1, wherein the ionic groups comprise positively charged ionic groups. ### Claim 6 (depends on 5) The filter component of claim 5, wherein the ionic group is groups comprise an imidazole. ### Claim 7 (depends on 1) The filter component of claim 1, wherein the ionic group-containing reactive compound is selected from 1-vinyl imidazole, vinyl pyridine, vinyl sulfonic acid, sodium vinyl sulfonate, vinyl phosphonic acid, and sodium 4-vinylbenzenesulfonate. ### Claim 8 (depends on 1) The filter component of claim 1, wherein the non-ionic group-containing reactive compound is selected from: methylene bis acrylamide, 2-(dimethylamino)ethyl methacrylate, and 1,4-Butanediol divinyl ether. ### Claim 9 (depends on 1) A filter that includes a filter component of claim 1, the filter comprising: a fluoropolymer housing surrounding the membrane, an inlet that allows fluid to flow into the fluoropolymer housing, an outlet that allows the fluid to flow out of the housing after the fluid passes through the membrane. ### Claim 10 (depends on 1) The filter component of claim 1, wherein the porous fluoropolymer membrane has a pore size in a range of from about 0.001 microns to about 0.05 microns. ### Claim 11 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. ### Claim 12 (depends on 11) The filtration membrane of claim 11, wherein the ionic groups comprise negatively charged ionic groups. ### Claim 13 (depends on 11) The filtration membrane of claim 11, wherein the ionic groups are selected from: an ionic sulfur-containing group and an ionic phosphorus-containing group. ### Claim 14 (depends on 11) The filtration membrane of claim 11, wherein the ionic groups comprise positively charged ionic groups. ### Claim 15 (depends on 14) The filtration membrane of claim 14, wherein the ionic groups comprise an imidazole.