EP0398601A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Hydrophobic membranes
Assignee: Pall Corp
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Filing: 1990-05-11
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Granted: —
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Expires: 2010-05-11
Abstract
Abstract A hydrophobic polymeric microporous membrane having a CWST of less than about 28 dynes/cm is obtained by forming a (co)polymer of a fluorine-containing ethylenically unsaturated monomer that is permanently chemically bonded to a microporous membrane substrate.
Inventors
- 👤 Peter John Degen
- 👤 Isaac Rothman
- 👤 Thomas Charles Gsell
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 05:52
CPC Classifications
B; B01; B01D; B01D67/00; B01D67/0081; B01D67/0093; B01D67/00931; B01D19/00; B01D19/0031; C; C08; C08J; C08J9/00; C08J9/36; C08J9/40; C08J9/405
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
32 words
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 2
Dependent Claim
32 words
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 3
Dependent Claim
29 words
A microporous polymeric membrane according to claim 1 in which the superstrate fluoropolymer is formed by (co)polymerization of a monomer containing an ethylenically unsaturated group and a fluoroalkyl group.
Claim 4
Dependent Claim
16 words
A microporous polymeric membrane according to claim 2 in which the monomer comprises a perfluoroalkyl group.
Claim 5
Dependent Claim
24 words
A microporous polymeric membrane according to claim 2 in which the monomer is selected from the group consisting of perfluoroalkanesulfonamidoethyl acrylates and perfluoroalkanesulfonamidoethyl methacrylates.
Claim 6
Dependent Claim
31 words
A microporous polymeric membrane according to claim 1 in which the polymer from which the substrate membrane is made is selected from the group consisting of polyamides, polyolefins, and fluorine-containing polymers.
Claim 7
Dependent Claim
24 words
A microporous polymeric membrane according to claim 1 in which the superstrate fluoropolymer is a copolymer of a non-fluorine-containing monomer and a fluorine-containing monomer.
Claim 8
Dependent Claim
32 words
A microporous polymeric membrane according to claim 6 in which the non-fluorine-containing monomer is an ethylenically unsaturated monomer is selected from the group consisting of unsaturated acids and esters of such acids.
Claim 9
Dependent Claim
27 words
A microporous polymeric membrane according to claim 7 in which the ethylenically unsaturated monomer is selected from esters of acrylic and methacrylic acids with a C₁-C₁₈ alcohol.
Claim 10
Dependent Claim
44 words
A microporous polymeric membrane having a CWST less than about 28 dynes/cm 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 11
Dependent Claim
44 words
A microporous polymeric membrane having a CWST less than about 28 dynes/cm 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 12
Dependent Claim
34 words
A microporous polymeric membrane according to claim 9 in which the superstrate polymer is a copolymer of a non-fluorine-containing ethylenically unsaturated monomer and a monomer having an ethylenically unsaturated group and a perfluoroalkyl group.
Claim 13
Dependent Claim
33 words
The microporous polymeric membrane according to claim 1 wherein said membrane possesses an air flow resistance that does not differ significantly from the air flow resistance of the ungrafted microporous polymeric membrane substrate.
Claim 14
Dependent Claim
22 words
The microporous polymeric membrane according to claim 1 wherein said microporous polymeric membrane retains an essentially unchanged CWST after exposure to trichlorotri-fluoroethane.
Claim 15
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 16
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 17
Dependent Claim
26 words
A process according to claim 13 in which the membrane is contacted with a solution of the fluorine-containing monomer which is then subjected to polymerization conditions.
Claim 18
Dependent Claim
40 words
A process according to claim 13 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 19
Dependent Claim
18 words
A process according to claim 13 in which the polymerization is effected under the influence of ionizing radiation.
Claim 20
Dependent Claim
18 words
A process according to claim 13 in which the microporous polymeric membrane is formed from a fluorine-containing polymer.
Claim 21
Dependent Claim
15 words
A device for processing fluids which incorporates a microporous polymeric membrane according to claim 1.
Claim 22
Dependent Claim
16 words
A gas filtration/drying process which comprises passing a gas through a membrane according to claim 1.
Claim 23
Dependent Claim
23 words
A method of venting a gas from a vessel which comprises allowing the gas to vent through a membrane according to claim 1.
Claim 24
Dependent Claim
27 words
A method of separating a gas from a liquid in a gas/liquid mixture which comprises allowing the gas to pass through a membrane according to claim 1.
References Cited (Backward Citations)
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