US5403483A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrophobic porous membranes and process for the manufacture thereof
Assignee: Mitsubishi Chemical Corp
•
Filing: 1993-07-22
•
Granted: 1995-04-04
•
Expires: 2013-07-22
Abstract
Abstract Disclosed is a hydrophobic porous membrane with a polymer having fluorinated alkyl side chains held in physical contact with the surface of a polyolefin porous membrane in which the fluorinated alkyl side chains of the polymer are crystallized, as well as its manufacturing process. Also disclosed is a hydrophobic porous membrane with a fluorinated crosslinked polymer from a fluorinated monomer with a fluorinated alkyl side chain and a crosslinking monomer held in physical contact with the surface of a polyolefin porous membrane, in which the fluorinated alkyl side chains of the fluorinated crosslinked polymer are crystallized, as well as its manufacturing process. These porous membranes use polyolefin porous membranes having a higher mechanical strength and lower costs than the fluorinated polymer porous membranes and still provide superior hydrophobicity over polytetrafluoroethylene type membranes.
Inventors
- 👤 Kazuaki Hayashida
- 👤 Takao Miyamori
- 👤 Jun Kamo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:59
CPC Classifications
B; B01; B01D; B01D67/00; B01D67/0081; B01D67/0088; B01D39/00; B01D39/08; B01D39/083; B01D2239/00; B01D2239/04; B01D2239/0414; B01D2239/0428; B01D2239/0464; B01D2239/0471; B01D2239/06; B01D2239/0604; B01D2239/0618
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
44 words
A hydrophobic porous membrane comprising a polyolefin porous membrane and a polymer having a fluorinated alkyl side chains, wherein the polymer is held in physical contact with the surface of said polyolefin porous membrane and the fluoroalkyl side chains of said polymer are crystallized.
Claim 2
Dependent Claim
44 words
A hydrophobic porous membrane comprising a polyolefin porous membrane and a polymer having a fluorinated alkyl side chains, wherein the polymer is held in physical contact with the surface of said polyolefin porous membrane and the fluoroalkyl side chains of said polymer are crystallized.
Claim 3
Dependent Claim
32 words
A hydrophobic porous membrane as set forth in claim 1 in which the polymer having fluorinated alkyl side chains is a polymer of a fluorinated alkyl methacrylate or a fluorinated alkyl acrylate.
Claim 4
Dependent Claim
48 words
A hydrophobic porous membrane as set forth in claim 1 in which the polymer having fluorinated alkyl side chains is a polymer of a fluorinated alkyl methacrylate or a fluorinated alkyl acrylate having at least 7, but not more than 15 carbon atoms in the ester moiety thereof.
Claim 5
Dependent Claim
45 words
A hydrophobic porous membrane as set forth in claim 1 in which the polymer having fluorinated alkyl side chains is a polymer of a perfluoroalkylethyl methacrylate or perfluoroalkylethyl acrylate having at least 7, but not more than 15 carbon atoms in the ester moiety thereof.
Claim 6
Dependent Claim
23 words
A hydrophobic porous membrane as set forth in claim 1 in which the polyolefin porous membrane is a polyethylene or polypropylene porous membrane.
Claim 7
Dependent Claim
27 words
A hydrophobic porous membrane as set forth in claim 1 in which the polyolefin porous membrane is a polyethylene hollow fiber membrane or polypropylene hollow fiber membrane.
Claim 8
Dependent Claim
21 words
A hydrophobic porous membrane as set forth in claim 1 in which the polyolefin porous membrane is a polyolefin flat membrane.
Claim 9
Dependent Claim
21 words
A hydrophobic porous membrane as set forth in claim 1 in which the polyolefin porous membrane is a polyolefin woven membrane.
Claim 10
Dependent Claim
57 words
A hydrophobic porous membrane comprising a polyolefin porous membrane and a fluorinated crosslinked polymer from a fluorinated monomer having a fluorinated alkyl side chain and a crosslinking monomer, wherein the polymer is held in physical contact with the surface of said polyolefin porous membrane and the fluorinated alkyl side chains of said fluorinated crosslinked polymer are crystallized.
Claim 11
Dependent Claim
57 words
A hydrophobic porous membrane comprising a polyolefin porous membrane and a fluorinated crosslinked polymer from a fluorinated monomer having a fluorinated alkyl side chain and a crosslinking monomer, wherein the polymer is held in physical contact with the surface of said polyolefin porous membrane and the fluorinated alkyl side chains of said fluorinated crosslinked polymer are crystallized.
Claim 12
Dependent Claim
30 words
A hydrophobic porous membrane as set forth in claim 7 in which the fluorinated monomer having a fluorinated alkyl side chain is a fluorinated alkyl methacrylate or fluorinated alkyl acrylate.
Claim 13
Dependent Claim
46 words
A hydrophobic porous membrane as set forth in claim 7 in which the fluorinated monomer having a fluorinated alkyl side chain is a fluorinated alkyl methacrylate or fluorinated alkyl acrylate having at least 7, but not more than 15, carbon atoms in the ester moiety thereof.
Claim 14
Dependent Claim
44 words
A hydrophobic porous membrane as set forth in claim 7 in which the fluorinated monomer having a fluorinated alkyl side chain is a perfluoroalkylethyl methacrylate or perfluoroalkylethyl acrylate having at least 7, but not more than 15, carbon atoms in the ester moiety thereof.
Claim 15
Dependent Claim
22 words
A hydrophobic porous membrane as set forth in claim 7 in which the crosslinking monomer is a polyfunctional methacrylate or polyfunctional acrylate.
Claim 16
Dependent Claim
23 words
A hydrophobic porous membrane as set forth in claim 7 in which the polyolefin porous membrane is a polyethylene or propylenc porous membrane.
Claim 17
Dependent Claim
28 words
A hydrophobic porous membrane as set forth in claim 7 in which the polyolefin porous membrane is a polyethylene hollow fiber membrane or a polypropylene hollow fiber membrane.
Claim 18
Dependent Claim
21 words
A hydrophobic porous membrane as set forth in claim 7 in which the polyolefin porous membrane is a polyolefin flat membrane.
Claim 19
Dependent Claim
21 words
A hydrophobic porous membrane as set forth in claim 7 in which the polyolefin porous membrane is a polyolefin wovcn membrane.
Claim 20
Dependent Claim
43 words
A process for the manufacture of a hydrophobic porous membrane, comprising the steps of holding a polymer having fluorinated alkyl side chains in physical contact with the surface of a polyolefin porous membrane and heat treating, thereby crystallizing said fluorinated alkyl side chains.
Claim 21
Dependent Claim
43 words
A process for the manufacture of a hydrophobic porous membrane, comprising the steps of holding a polymer having fluorinated alkyl side chains in physical contact with the surface of a polyolefin porous membrane and heat treating, thereby crystallizing said fluorinated alkyl side chains.
Claim 22
Dependent Claim
64 words
A process for the manufacture of a hydrophobic porous membrane, comprising the steps of adhering a monomer having a fluorinated alkyl side chain to the surface of a polyolefin porous membrane, polymerizing in situ to hold the polymer having fluorinated alkyl side chains in physical contact with the surface of the polyolefin porous membrane, and heat treating, thereby crystallizing said fluorinated alkyl side chains.
Claim 23
Dependent Claim
64 words
A process for the manufacture of a hydrophobic porous membrane, comprising the steps of adhering a monomer having a fluorinated alkyl side chain to the surface of a polyolefin porous membrane, polymerizing in situ to hold the polymer having fluorinated alkyl side chains in physical contact with the surface of the polyolefin porous membrane, and heat treating, thereby crystallizing said fluorinated alkyl side chains.
Claim 24
Dependent Claim
53 words
A process for the manufacture of a hydrophobic porous membrane, comprising the steps holding a fluorinated crosslinked polymer from a fluorinated monomer having a fluorinated alkyl side chain and a crosslinking monomer in physical contact with the surface of a polyolefin porous membrane, and heat treating, thereby crystallizing said fluorinated alkyl side chains.
Claim 25
Dependent Claim
53 words
A process for the manufacture of a hydrophobic porous membrane, comprising the steps holding a fluorinated crosslinked polymer from a fluorinated monomer having a fluorinated alkyl side chain and a crosslinking monomer in physical contact with the surface of a polyolefin porous membrane, and heat treating, thereby crystallizing said fluorinated alkyl side chains.
Claim 26
Dependent Claim
80 words
A process for the manufacture of a hydrophobic porous membrane, comprising the steps adhering a fluorinated monomer having a fluorinated alkyl side chain and a crosslinking monomer to the surface of a polyolefin porous membrane, polymerizing in situ to hold the fluorinated crosslinked polymer composed of the fluorinated monomer having a fluorinated alkyl side chain and the crosslinking monomer in physical contact with the surface of the polyolefin porous membrane, and heat treating, thereby crystallizing said fluorinated alkyl side chains.
Claim 27
Dependent Claim
80 words
A process for the manufacture of a hydrophobic porous membrane, comprising the steps adhering a fluorinated monomer having a fluorinated alkyl side chain and a crosslinking monomer to the surface of a polyolefin porous membrane, polymerizing in situ to hold the fluorinated crosslinked polymer composed of the fluorinated monomer having a fluorinated alkyl side chain and the crosslinking monomer in physical contact with the surface of the polyolefin porous membrane, and heat treating, thereby crystallizing said fluorinated alkyl side chains.
References Cited (Backward Citations)
US4055696A
Cited
US4217198A
Cited
JPS5742919A
Cited
EP0183989A2
Cited
US4964991A
Cited
US4618533A
Cited
US4695592A
Cited
US4917793A
Cited
FR2608452A1
Cited
US4961853A
Cited
US5102552A
Cited
US4941792A
Cited
EP0398601A1
Cited
US4954256A
Cited
US5232600A
Cited
WO1991001791A1
Cited
US5232642A
Cited
US5286382A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-04-03 | 1998-10-03 | 1999-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-04-03 | 2002-10-03 | 2003-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-04-03 | 2006-10-03 | 2007-04-04 | $7700.00 | Window Closed / Lapsed |