US5217802A
Expired / Lapsed
US
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Hydrophobic polymeric membrane composites
Assignee: EMD Millipore Corp
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Filing: 1992-03-17
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Granted: 1993-06-08
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Expires: 2012-03-17
Abstract
Abstract A composite porous membrane is formed from a porous polymeric substrate having its entire surface modified with a cross-linked polymer which results in a hydrophobic and oleophobic surface. The composite membrane retains substantially all of its other original properties. The cross-linked polymer is formed in situ on the polymeric substrate from a reactant system comprising an ethylenically unsaturated monomer having at least one fluoroalkyl group, a cross-linker, and, if needed, a polymerization initiator, dissolved in a nonpolar and or weakly polar solvent system. The membrane substrate saturated with the reactant system is exposed to a suitable energy source to effect polymerization and cross linking of the monomer.
Inventors
- 👤 Louis M. Scarmoutzos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:29
CPC Classifications
B; B01; B01D; B01D67/00; B01D67/0081; B01D67/0088; C; C08; C08J; C08J9/00; C08J9/36; C08J9/40; C08J9/405; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249954; Y10T428/249955; Y10T428/249958; Y10T428/249978; Y10T428/249979; Y10T428/249987; Y10T428/249991; Y10T428/249992
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
139 words
The process for forming a composite porous membrane formed from a porous membrane substrate having an average pore size between about 0.001 and 10 microns formed of a first polymer, said substrate having a surface which is modified on its entire surface with a cross-linked second polymer such that it does not wet with solvents whose surface tension is greater than about 21 dynes/cm, said composite porous membrane having essentially the same porous configuration as said porous membrane substrate which comprises: contacting said porous membrane substrate with a solution of a polymerizable fluorine containing monomer and a cross-linking agent for said monomer in a nonpolar or weakly polar solvent system under conditions to polymerize said monomer and to cross-link said second polymer in situ over the entire surface of said first polymer and to avoid plugging of said pores.
Claim 2
Dependent Claim
139 words
The process for forming a composite porous membrane formed from a porous membrane substrate having an average pore size between about 0.001 and 10 microns formed of a first polymer, said substrate having a surface which is modified on its entire surface with a cross-linked second polymer such that it does not wet with solvents whose surface tension is greater than about 21 dynes/cm, said composite porous membrane having essentially the same porous configuration as said porous membrane substrate which comprises: contacting said porous membrane substrate with a solution of a polymerizable fluorine containing monomer and a cross-linking agent for said monomer in a nonpolar or weakly polar solvent system under conditions to polymerize said monomer and to cross-link said second polymer in situ over the entire surface of said first polymer and to avoid plugging of said pores.
Claim 3
Dependent Claim
12 words
The process of claim 1 wherein said first polymer is a polyamide.
Claim 4
Dependent Claim
12 words
The process of claim 1 wherein said first polymer is a cellulosic.
Claim 5
Dependent Claim
12 words
The process of claim 1 wherein the first polymer is polyvinylidene fluoride.
Claim 6
Dependent Claim
14 words
The process of claim 1 wherein the first polymer is a fluorinated hydrocarbon polymer.
Claim 7
Dependent Claim
13 words
The process of claim 1 wherein the first polymer is a polyolefinic hydrocarbon.
Claim 8
Dependent Claim
12 words
The process of claim 1 wherein the first polymer is a polysulfone.
Claim 9
Dependent Claim
12 words
The process of claim 1 wherein the first polymer is a polyester.
Claim 10
Dependent Claim
12 words
The process of claim 1 wherein the first polymer is a polycarbonate.
Claim 11
Dependent Claim
12 words
The process of claim 1 wherein the first polymer is a polyurethane.
Claim 12
Dependent Claim
24 words
The process of any one of claims 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10 wherein said solvent is a siloxane.
Claim 13
Dependent Claim
23 words
The process of any one of claims 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10 wherein said solvent is hexamethyldisiloxane.
Claim 14
Dependent Claim
11 words
The process of claim 1 wherein said monomer is a fluoroacrylate.
Claim 15
Dependent Claim
11 words
The process of claim 1 wherein said monomer is a fluoroalkylsiloxane.
Claim 16
Dependent Claim
12 words
The process of claim 1 wherein said monomer is a fluorinated styrene.
Claim 17
Dependent Claim
11 words
The process of claim 1 wherein said monomer is a fluoroolefin.
References Cited (Backward Citations)
US4954256A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-06-07 | 1996-12-07 | 1997-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-06-07 | 2000-12-07 | 2001-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-06-07 | 2004-12-07 | 2005-06-08 | $7700.00 | Window Closed / Lapsed |