Patent US5137633A successfully refreshed from Google Patents.
US5137633A
Expired / Lapsed
US
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Hydrophobic membrane having hydrophilic and charged surface and process
Assignee: EMD Millipore Corp
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Filing: 1991-06-26
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Granted: 1992-08-11
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Expires: 2011-06-26
Abstract
Abstract The surface of a hydrophobic porous substrate is modified with an interpolymeric network of a hydrophilic crosslinked polymer and a crosslinked-polyamine epichlorohydrin resin having fixed positive charges. The hydrophobic substrate is contacted with a reaction system comprising a solution of (a) monomer precursor to the hydrophilic polymer, a nonionic or cationic polymerization initiator and a crosslinking agent and (b) a precursor to the crosslinked positively charged resin. The monomer is polymerized and cross-linked by free radical polymerization followed by heating the contacted substrate to form the charged resin.
Inventors
- 👤 David Wang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:03
CPC Classifications
B; B01; B01D; B01D67/00; B01D67/0081; B01D67/0088; B01D39/00; B01D39/14; B01D39/16; B01D39/1607; B01D39/1623; B01D67/0093; B01D67/00933; G; G01; G01N; G01N27/00; G01N27/26; G01N27/416; G01N27/447; G01N27/44704; G01N27/44717; B01D2239/00; B01D2239/04; B01D2239/0414; B01D2239/0421; B01D2239/0428; B01D2239/0464; B01D2239/0471; B01D2239/12; B01D2239/1216; B01D2323/00; B01D2323/30
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
103 words
A porous hydrophobic filter substrate having its surface modified with a coating to render the surface hydrophilic and modified with positive charges, said coating comprising an interpenetrating polymeric network comprising: (a) a first polymeric composition of a polyamide polyamine epichlorohydrin cationic charge modifying agent having tertiary amine or quaternary ammonium groups crosslinked in situ on said surface and (b) a crosslinked polymer formed from a monomer polymerized in situ on said surface with a nonionic or cationic free radical initiator and crosslinked in situ on said substrate, said composite porous substrate having essentially the same porous configuration as said hydrophobic porous filter substrate.
Claim 2
Dependent Claim
103 words
A porous hydrophobic filter substrate having its surface modified with a coating to render the surface hydrophilic and modified with positive charges, said coating comprising an interpenetrating polymeric network comprising: (a) a first polymeric composition of a polyamide polyamine epichlorohydrin cationic charge modifying agent having tertiary amine or quaternary ammonium groups crosslinked in situ on said surface and (b) a crosslinked polymer formed from a monomer polymerized in situ on said surface with a nonionic or cationic free radical initiator and crosslinked in situ on said substrate, said composite porous substrate having essentially the same porous configuration as said hydrophobic porous filter substrate.
Claim 3
Dependent Claim
14 words
The modified filter substrate of claim 1 wherein said substrate is a porous membrane.
Claim 4
Dependent Claim
18 words
The modified filter substrate of claim 2 having an average pore size between about 0.05 and 10 microns.
Claim 5
Dependent Claim
15 words
The modified filter substrate of claim 1 wherein said substrate is a porous nonwoven substrate.
Claim 6
Dependent Claim
18 words
The modified hydrophobic filter substrate of claim 1 wherein said crosslinked second polymer is derived from an acrylate.
Claim 7
Dependent Claim
24 words
The modified hydrophobic filter substrate of any one of claims 1, 2, 3 or 4 wherein said hydrophobic substrate is a fluorinated ethylene polymer.
Claim 8
Dependent Claim
22 words
The modified hydrophobic filter substrate of any one of claims 1, 2, 3 or 4 wherein said hydrophobic substrate is polyvinylidene fluoride.
Claim 9
Dependent Claim
22 words
The modified hydrophobic filter substrate of any one of claims 1, 2, 3 or 4 wherein said hydrophobic substrate is a polyolefin.
Claim 10
Dependent Claim
22 words
The modified hydrophobic filter substrate of any one of claims 1, 2, 3 or 4 wherein said hydrophobic substrate is a polyester.
Claim 11
Dependent Claim
22 words
The modified hydrophobic filter substrate of any one of claims 1, 2, 3 or 4 wherein said hydrophobic substrate is a polysulfone.
Claim 12
Dependent Claim
22 words
The modified hydrophobic filter substrate of any one of claims 1, 2, 3 or 4 wherein said hydrophobic substrate is a polyetherimide.
Claim 13
Dependent Claim
23 words
The modified hydrophobic filter substrate of any one of claims 1, 2, 3 or 4 wherein said hydrophobic substrate is a polyethylene sulfone.
Claim 14
Dependent Claim
95 words
The process for forming the surface modified substrate of claim 1 which comprises; (A) contacting a hydrophobic porous substrate with a solution of (a) a polymerizable hydrophilic monomer, a cross-linking agent for said hydrophilic monomer and a nonionic or cationic polymerization initiator for said monomer and (b) a long chain polyamine-epichlorohydrin reaction product, (B) polymerizing and cross-linking said monomer by free radical polymerization in situ on said substrate and (C) cross linking said polyamine epichlorohydrin charge modifying agent to produce a crosslinked polymer having tertiary amine and quaternary ammonium groups in situ on said substrate.
Claim 15
Dependent Claim
14 words
The process of claim 13 wherein said hydrophilic monomer also comprises said cross-linking agent.
Claim 16
Dependent Claim
16 words
The process of any one of claim 13 or 14 wherein said substrate is a membrane.
Claim 17
Dependent Claim
18 words
The process of any one of claims 13 or 14 wherein said substrate is a porous nonwoven substrate.
References Cited (Backward Citations)
US4908236A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-08-11 | 1996-02-10 | 1996-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-08-11 | 2000-02-10 | 2000-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-08-11 | 2004-02-10 | 2004-08-11 | $7700.00 | Window Closed / Lapsed |