US5079272A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Porous membrane formed from interpenetrating polymer network having hydrophilic surface
Assignee: EMD Millipore Corp
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Filing: 1989-11-30
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Granted: 1992-01-07
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Expires: 2009-11-30
Abstract
Abstract A porous membrane is formed from an interpenetrating polymer network of a hydrophobic polymer and a polymerized and crosslinked hydrophilic monomeric composition. A solution of the polymer and monomeric composition is cast, exposed to ultraviolet radiation, coagulated and dried. The resulting dried membrane is annealed in order to render its surface hydrophilic.
Inventors
- 👤 Anthony E. Allegrezza, Jr.
- 👤 Ellen C. Bellantoni
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:19
CPC Classifications
B; B01; B01D; B01D67/00; B01D67/0002; B01D67/0006; B01D67/0009; B01D67/0011; B01D67/00111; B01D67/0081; B01D67/0083; B01D69/00; B01D69/14; B01D69/141; B01D71/00; B01D71/06; B01D71/30; B01D71/32; B01D71/34; B01D2323/00; B01D2323/30; B01D2323/38; B01D2323/385; B01D2325/00; B01D2325/36; Y; Y10; Y10S; Y10S525/00; Y10S525/903
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
81 words
A porous membrane having a water wettable surface which comprises a porous interpenetrating polymer network of a hydrophobic fluorinated hydrocarbon polymer and a hydrophilic cross-linked polymer, formed from a monomer selected from the group consisting of an hydroxylalkyl acrylate, an hydroxylalkyl methacrylate and N-vinylpyrrolidone, said membrane having a hydrophilic surface formed from said hydrophobic polymer in semi-crystalline form and said hydrophilic polymer, said surface being entirely wettable with an aqueous liquid within a time period of less than about 1 minute.
Claim 2
Dependent Claim
81 words
A porous membrane having a water wettable surface which comprises a porous interpenetrating polymer network of a hydrophobic fluorinated hydrocarbon polymer and a hydrophilic cross-linked polymer, formed from a monomer selected from the group consisting of an hydroxylalkyl acrylate, an hydroxylalkyl methacrylate and N-vinylpyrrolidone, said membrane having a hydrophilic surface formed from said hydrophobic polymer in semi-crystalline form and said hydrophilic polymer, said surface being entirely wettable with an aqueous liquid within a time period of less than about 1 minute.
Claim 3
Dependent Claim
20 words
The porous membrane of claim 1 wherein said membrane has a maximum pore size between about 0.01 and 0.1 microns.
Claim 4
Dependent Claim
102 words
The porous membranes of claim 2 wherein said membrane has an isopropyl alcohol bubble point of between about 40 psi and about 140 psi, a water flux of above about 3500 gallons per foot per day at 25 psi for a membrane having a bubble point of about 40 psi, a water flux of above about 1000 gallons per foot per day at 25 psi for a membrane having a bubble point of about 80 psi, and a water flux above about 1000 gallons per foot per day at 25 psi for a membrane having a bubble point of about 140 psi.
Claim 5
Dependent Claim
18 words
The membrane of any one of claims 1, 2 or 3 wherein the hydrophobic polymer is polyvinylidene fluoride.
Claim 6
Dependent Claim
22 words
The porous membrane of any one of claims 1, 2, or 3 wherein said hydrophilic polymer is formed from an hydroxylalkyl acrylate.
References Cited (Backward Citations)
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1995-01-06 | 1995-07-08 | 1996-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-01-06 | 1999-07-08 | 2000-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-01-06 | 2003-07-08 | 2004-01-07 | $7700.00 | Window Closed / Lapsed |