US5232600A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrophobic membranes
Assignee: Pall Corp
•
Filing: 1992-10-23
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Granted: 1993-08-03
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Expires: 2012-10-23
Abstract
Abstract A process for the preparation of a microporous polymeric membrane is provided which includes polymerizing a polymerizable fluorine-containing monomer in the presence of a microporous polymeric membrane substrate such that the fluorine-containing monomer forms a polymeric superstrate that is permanently chemically bonded to all surfaces of the membrane. A device is also provided for processing fluids which incorporates a microporous polymeric membrane having a CWST of less than about 28 dynes/cm and includes a microporous polymeric membrane substrate formed from a material such as a fluoropolymer and, permanently chemically bonded to all portions of the surface thereof is a superstrate, which may be a polymer or copolymer derived from a monomer(s), having an ethylenically unsaturated group and a perfluoroalkyl group. A gas filtration/drying process, a method of venting a gas from a vessel and a method of separating a gas from a liquid in a gas/liquid mixture using a microporous polymeric membrane having a CWST less than about 28 dynes/cm which includes a microporous polymeric membrane substrate and a superstrate fluoropolymer permanently chemically bonded to all portions of the membrane substrate are also provided.
Inventors
- 👤 Peter J. Degen
- 👤 Isaac Rothman
- 👤 Thomas C. Gsell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:50
CPC Classifications
B; B01; B01D; B01D67/00; B01D67/0081; B01D67/0093; B01D19/00; B01D19/0031; C; C08; C08J; C08J9/00; C08J9/36; C08J9/40; C08J9/405
Claims Analysis
Total Claims: 37
Claim 1
Independent Claim
46 words
A process for the preparation of a microporous polymeric membrane which comprises polymerizing a polymerizable fluorine-containing monomer in the presence of a microporous polymeric membrane substrate such that the fluorine-containing monomer forms a polymeric superstrate that is permanently chemically bonded to all surfaces of the membrane.
Claim 2
Dependent Claim
46 words
A process for the preparation of a microporous polymeric membrane which comprises polymerizing a polymerizable fluorine-containing monomer in the presence of a microporous polymeric membrane substrate such that the fluorine-containing monomer forms a polymeric superstrate that is permanently chemically bonded to all surfaces of the membrane.
Claim 3
Dependent Claim
26 words
A process according to claim 1 in which the membrane is contacted with a solution of the fluorine-containing monomer which is then subjected to polymerization conditions.
Claim 4
Dependent Claim
40 words
A process according to claim 1 in which the polymerizable fluorine-containing monomer is polymerized in the presence of a non-fluorine-containing ethylenically unsaturated monomer so as to form a copolymer that is permanently chemically bonded to the surfaces of the membrane.
Claim 5
Dependent Claim
18 words
A process according to claim 1 in which the polymerization is effected under the influence of ionizing radiation.
Claim 6
Dependent Claim
13 words
A process according to claim 4 in which the ionizing radiation is γ-radiation.
Claim 7
Dependent Claim
23 words
A process according to claim 5 in which an ionizing radiation dose rate of from about 5 to about 100 krad/hr is used.
Claim 8
Dependent Claim
20 words
A process according to claim 6 in which the radiation dose rate is from about 5 to about 15 krad/hr.
Claim 9
Dependent Claim
18 words
A process according to claim 4 in which the ionizing radiation is provided by a 60 Co source.
Claim 10
Dependent Claim
18 words
A process according to claim 1 in which the microporous polymeric membrane is formed from a fluorine-containing polymer.
Claim 11
Dependent Claim
13 words
A process according to claim 9 wherein said fluorine-containing polymer is poly(vinylidene fluoride).
Claim 12
Dependent Claim
17 words
A process according to claim 1 in which the microporous polymeric membrane is formed from a polyamide.
Claim 13
Dependent Claim
34 words
A process according to claim 1 wherein said microporous polymeric membrane substrate is formed from a material selected from the group consisting of polyolefins, polyamides, polyesters, polyurethanes, polysulfones, poly(vinylidene fluoride); polytetrafluoroethylene and perfluoroalkoxy resins.
Claim 14
Dependent Claim
25 words
A process according to claim 1 wherein said microporous polymeric membrane substrate comprises a hydrophobic material having a CWST of less than about 35 dynes/cm.
Claim 15
Independent Claim
41 words
A device for processing fluids which incorporates a microporous polymeric membrane having a CWST of less than about 28 dynes/cm and comprising a microporous polymeric membrane substrate and, permanently chemically bonded to all portions of the surface thereof, a superstrate fluoropolymer.
Claim 16
Independent Claim
41 words
A device for processing fluids which incorporates a microporous polymeric membrane having a CWST of less than about 28 dynes/cm and comprising a microporous polymeric membrane substrate and, permanently chemically bonded to all portions of the surface thereof, a superstrate fluoropolymer.
Claim 17
Dependent Claim
28 words
A device according to claim 14 wherein said microporous polymeric membrane substrate is formed from a material selected from the group consisting of polyolefins, polyamides, polyesters, polyurethanes, polysulfones,
Claim 18
Independent Claim
53 words
A device for processing fluids which incorporates a microporous polymeric membrane having a CWST of less than about 28 dynes/cm and comprising a microporous, fluoropolymeric membrane substrate and, permanently chemically bonded to all portions of the surface thereof, a superstrate (co)polymer of a monomer having an ethylenically unsaturated group and a perfluoroalkyl group.
Claim 19
Independent Claim
53 words
A device for processing fluids which incorporates a microporous polymeric membrane having a CWST of less than about 28 dynes/cm and comprising a microporous, fluoropolymeric membrane substrate and, permanently chemically bonded to all portions of the surface thereof, a superstrate (co)polymer of a monomer having an ethylenically unsaturated group and a perfluoroalkyl group.
Claim 20
Dependent Claim
42 words
A gas filtration/drying process which comprises passing a gas through a microporous polymeric membrane having a CWST less than about 28 dynes/cm comprising a microporous polymeric membrane substrate and permanently chemically bonded to all portions of the surface thereof, a superstrate fluoropolymer.
Claim 21
Dependent Claim
42 words
A gas filtration/drying process which comprises passing a gas through a microporous polymeric membrane having a CWST less than about 28 dynes/cm comprising a microporous polymeric membrane substrate and permanently chemically bonded to all portions of the surface thereof, a superstrate fluoropolymer.
Claim 22
Independent Claim
49 words
A method of venting a gas from a vessel which comprises allowing the gas to vent through a microporous polymeric membrane having a CWST less than about 28 dynes/cm comprising a microporous polymeric membrane substrate and permanently chemically bonded to all portions of the surface thereof, a superstrate fluoropolymer.
Claim 23
Independent Claim
49 words
A method of venting a gas from a vessel which comprises allowing the gas to vent through a microporous polymeric membrane having a CWST less than about 28 dynes/cm comprising a microporous polymeric membrane substrate and permanently chemically bonded to all portions of the surface thereof, a superstrate fluoropolymer.
Claim 24
Dependent Claim
41 words
A method of venting a gas from a vessel according to claim 18 wherein said microporous polymeric membrane substrate is formed from a material selected from the group consisting of polyolefins, polyamides, polyesters, polyurethanes, polysulfones, poly(vinylidene fluoride); polytetrafluoroethylene and perfluoroalkoxy resins.
Claim 25
Dependent Claim
22 words
A method of venting a gas from a vessel according to claim 18 wherein said microporous polymeric membrane substrate is poly(vinylidene fluoride).
Claim 26
Dependent Claim
21 words
A method of venting a gas from a vessel according to claim 18 wherein said superstrate fluoropolymer comprises a fluoroalkanesulfonamidoethyl acrylate.
Claim 27
Dependent Claim
21 words
A method of venting a gas from a vessel according to claim 21 wherein said superstrate fluoropolymer comprises a 2-(n-ethylperfluorooctanesulfonamido)ethyl acrylate.
Claim 28
Dependent Claim
36 words
A gas filtration/drying process according to claim 17 wherein said microporous polymeric membrane substrate is formed from a material selected from the group consisting of polyolefins, polyamides, polyesters, polyurethanes, polysulfones, poly(vinylidene fluoride); polytetrafluoroethylene and perfluoroalkoxy resins.
Claim 29
Dependent Claim
17 words
A gas filtration/drying process according to claim 17 wherein said microporous polymeric membrane substrate is poly(vinylidene fluoride).
Claim 30
Dependent Claim
16 words
A gas filtration/drying process according to claim 17 wherein said superstrate fluoropolymer comprises a fluoroalkanesulfonamidoethyl acrylate.
Claim 31
Dependent Claim
16 words
A gas filtration/drying process according to claim 25 wherein said superstrate fluoropolymer comprises a 2-(N-ethylperfluorooctanesulfonamido)ethyl acrylate.
Claim 32
Independent Claim
53 words
A method of separating a gas from a liquid in a gas/liquid mixture which comprises allowing the gas to pass through a microporous polymeric membrane having a CWST less than about 28 dynes/cm comprising a microporous polymeric membrane substrate and permanently chemically bonded to all portions of the surface thereof, a superstrate fluoropolymer.
Claim 33
Independent Claim
53 words
A method of separating a gas from a liquid in a gas/liquid mixture which comprises allowing the gas to pass through a microporous polymeric membrane having a CWST less than about 28 dynes/cm comprising a microporous polymeric membrane substrate and permanently chemically bonded to all portions of the surface thereof, a superstrate fluoropolymer.
Claim 34
Dependent Claim
46 words
A method of separating a gas from a liquid in a gas/liquid mixture according to claim 27 wherein said microporous polymeric membrane substrate is formed from a material selected from the group consisting of polyolefins, polyamides, polyesters, polyurethanes, polysulfones, poly(vinylidene fluoride); polytetrafluoroethylene and and perfluoroalkoxy resins.
Claim 35
Dependent Claim
26 words
A method of separating a gas from a liquid in a gas/liquid mixture according to claim 27 wherein said microporous polymeric membrane substrate is poly(vinylidene fluoride).
Claim 36
Dependent Claim
25 words
A method of separating a gas from a liquid in a gas/liquid mixture according to claim 27 wherein said superstrate fluoropolymer comprises a fluoroalkanesulfonamidoethyl acrylate.
Claim 37
Dependent Claim
25 words
A method of separating a gas from a liquid in a gas/liquid mixture according to claim 30 wherein said superstrate fluoropolymer comprises a 2-(N-ethylperfluorooctanesulfonamido)ethyl acrylate.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-08-02 | 1997-02-01 | 1997-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-02 | 2001-02-01 | 2001-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-02 | 2005-02-01 | 2005-08-03 | $7700.00 | Window Closed / Lapsed |