US4865739A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing a porous mineral membrane on a mineral support
Assignee: CARBONE LORRAINE NORTH AMERICA
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Filing: 1987-06-18
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Granted: 1989-09-12
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Expires: 2007-06-18
Abstract
Abstract The invention relates to a process for preparing mineral and in particular, carbon-containing membranes on a porous mineral support. According to the process, at least one layer of a stable emulsion of mineral particles in a solution containing a thermosetting resin is deposited on a permeable, porous, mineral support. The resin undergoes a polycondensation treatment followed by coking, and the coke formed insures the mechanical connection of the mineral particles both to one another and to the support. The membranes produced according to the invention can be used in separating processes, particularly in microfiltration and ultrafiltration.
Inventors
- 👤 Jean-Michel Bauer
- 👤 Maurice Bontems
- 👤 Denis Desmicht
- 👤 Jacques Maire
- 👤 Serge Mollet
- 👤 Maurice Verna
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:22
CPC Classifications
B; B01; B01D; B01D69/00; B01D69/02; B01D63/00; B01D63/06; B01D63/062; B01D67/00; B01D67/0079; B01D67/00793; B01D69/10; B01D69/108; B01D69/12; B01D69/1214; B01D69/1216; B01D69/14; B01D69/141; B01D69/148; B01D71/00; B01D71/02; B01D71/021; B01D71/0215; B01D71/06; B01D71/38; B01D71/381; C; C04; C04B; C04B35/00; C04B35/71; C04B35/78; C04B35/80; C04B35/83; C04B41/00; C04B41/009; C04B41/45; C04B41/50; C04B41/5001; C04B41/80; C04B41/81; C04B41/85; B01D2323/00; B01D2323/15; B01D2323/218; B01D2323/2182; B01D2323/21827; B01D2323/21828; B01D2325/00; B01D2325/02; B01D2325/022
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
121 words
Process for producing a permeable, porous, mineral membrane, comprising depositing on a permeable, porous, mineral support a first layer of a stable emulsion of mineral particles in a solution containing a cokable thermosetting resin which emulsion does not penetrate the support, and carrying out a polycondensation treatment of the first layer of resin, depositing on said support and first polycondensed layer at least one further layer of a stable emulsion of mineral particles in a solution containing a cokable thermosetting resin and carrying out a polycondensation treatment for each further deposited layer, followed by coking of the resin layers on the support, the coked formed ensuring the mechanical connection of the mineral particles both to one another and to the support.
Claim 2
Dependent Claim
121 words
Process for producing a permeable, porous, mineral membrane, comprising depositing on a permeable, porous, mineral support a first layer of a stable emulsion of mineral particles in a solution containing a cokable thermosetting resin which emulsion does not penetrate the support, and carrying out a polycondensation treatment of the first layer of resin, depositing on said support and first polycondensed layer at least one further layer of a stable emulsion of mineral particles in a solution containing a cokable thermosetting resin and carrying out a polycondensation treatment for each further deposited layer, followed by coking of the resin layers on the support, the coked formed ensuring the mechanical connection of the mineral particles both to one another and to the support.
Claim 3
Dependent Claim
20 words
Process according to claim 1, wherein the mineral particles are selected from the group consisting of ceramic and carbon materials.
Claim 4
Dependent Claim
17 words
A process according to claim 2, wherein the mineral particles of said first layer comprise fibrous material.
Claim 5
Dependent Claim
24 words
A process according to claim 3, wherein a plurality of further layers are deposited, and each succeeding layer contains mineral particles of decreasing size.
Claim 6
Dependent Claim
19 words
Process according to claim 1 or 2, wherein the particles are in the form of small fibres or grains.
Claim 7
Dependent Claim
14 words
Process according to claim 5, wherein the particles are in the form of trichites.
Claim 8
Dependent Claim
44 words
Process according to claim 1 or 2, wherein the emulsion is of the engobe type and is obtained by mixing mineral particles in a polyvinyl alcohol to which has been added a defloculating agent, and that a thermosetting resin is added to this mixture.
Claim 9
Dependent Claim
13 words
Process according to claim 7, wherein the deflocculating agent is an ammonium salt.
Claim 10
Dependent Claim
30 words
Process according to claim 1 or 2, wherein the emulsion is obtained from a master paste of a paint based on mineral particles in a solution containing a thermosetting resin.
Claim 11
Dependent Claim
29 words
Process according to claim 1, wherein the mineral particles of the emulsions have different grain size distributions between the individual layers, decreasing as the distance from the support increases.
Claim 12
Dependent Claim
21 words
Process according to claim 10, wherein the mineral particles of the emulsions are made from different materials for the individual layers.
Claim 13
Dependent Claim
21 words
Process according to claim 1, wherein the mineral particles of the emulsions are made from different materials for the individual layers.
Claim 14
Dependent Claim
14 words
Process according to claim 1 or 2, wherein the mineral support is of carbon.
Claim 15
Dependent Claim
25 words
Process according to claim 13, wherein the carbon of the support is selected from the group consisting of polygranular carbons and carbon fibre/carbon matrix composites.
Claim 16
Dependent Claim
16 words
Process according to claim 1 or 2, wherein the mineral support is of a ceramic material.
Claim 17
Dependent Claim
12 words
Mineral membrane obtained according to the process of claim 1 or 2.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-09-11 | 1993-03-13 | 1993-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-11 | 1997-03-13 | 1997-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-11 | 2001-03-13 | 2001-09-12 | $7700.00 | Window Closed / Lapsed |