US4743349A
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US
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Electrically conductive fibrous web substrate and cathodic element comprised thereof
Assignee: Arkema France SA
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Filing: 1986-09-12
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Granted: 1988-05-10
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Expires: 2006-09-12
Abstract
Abstract Bonded, coherent fibrous web substrates well adopted as cathodic elements for electrolytic cells and advantageously incorporating an electrocatalytic agent, include a web matrix which comprises a plurality of fibers, at least a portion of which comprising electrically conductive fibers, e.g., carbon fibers, said plurality of fibers being coherently bonded together with a fluorine-containing polymer, and said web substrate having a resistivity of up to about 0.4 OMEGA .cm.
Inventors
- 👤 Jean Bachot
- 👤 Jean Grosbois
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:46
CPC Classifications
C; C25; C25B; C25B11/00; C25B11/04; C25B11/051; C25B11/073; C25B11/091; C25B11/095; C25B11/042; C25B11/048; Y; Y10; Y10T; Y10T442/00; Y10T442/60; Y10T442/69; Y10T442/692
Claims Analysis
Total Claims: 43
Claim 1
Independent Claim
61 words
A bonded, coherent fibrous web substrate including a fibrous web matrix which comprises a plurality of fibers, at least a portion of which comprising electrically conductive fibers, and a binder consisting of a fluorine-containing polymer, said plurality of fibers being coherently bonded together with said fluorine-containing polymer, and said web substrate having a resistivity of up to about 0.4 Ω cm.
Claim 2
Dependent Claim
61 words
A bonded, coherent fibrous web substrate including a fibrous web matrix which comprises a plurality of fibers, at least a portion of which comprising electrically conductive fibers, and a binder consisting of a fluorine-containing polymer, said plurality of fibers being coherently bonded together with said fluorine-containing polymer, and said web substrate having a resistivity of up to about 0.4 Ω cm.
Claim 3
Dependent Claim
17 words
The web substrate as defined by claim 1, having a resistivity of up to 0.1 Ω. cm.
Claim 4
Dependent Claim
30 words
The web substrate as defined by claim 1, said conductive fibers comprising filamentary elements having diameters of less than about 1 mm and lengths in excess of about 0.5 mm.
Claim 5
Dependent Claim
33 words
The web substrate as defined by claim 3, said conductive fibers comprising filamentary elements having diameters ranging from about 10 -5 to 0.1 mm and lengths ranging from about 1 to 20 mm.
Claim 6
Dependent Claim
46 words
The web substrate as defined by claim 1, said web matrix comprising electrically non-conductive fibers having a resistivity in excess of 0.4 ω. cm, the diameters of which being less than about 1 mm and the lengths of which being in excess of about 0.5 mm.
Claim 7
Dependent Claim
30 words
The web substrate as defined by claim 5, said non-conductive fibers having diameters ranging from about 10 -5 to 0.1 mm and lengths ranging from about 1 to 20 mm.
Claim 8
Dependent Claim
14 words
The web substrate as defined by claim 5, said conductive fibers comprising carbon fibers.
Claim 9
Dependent Claim
14 words
The web substrate as defined by claim 5, said non-conductive fibers comprising asbestos fibers.
Claim 10
Dependent Claim
32 words
The web substrate as defined by claim 5, the weight of said non-conductive fibers comprising up to 90% by weight of the total weight of said conductive fibers plus said non-conductive fibers.
Claim 11
Dependent Claim
32 words
The web substrate as defined by claim 9, the weight of said non-conductive fibers comprising from 20 to 70% by weight of the total weight of said conductive fibers plus non-conductive fibers.
Claim 12
Dependent Claim
14 words
The web substrate as defined by claim 1, said conductive fibers comprising carbon fibers.
Claim 13
Dependent Claim
16 words
The web substrate as defined by claim 1, said binder comprising a fluorinated homo- or copolyolefin.
Claim 14
Dependent Claim
22 words
The web substrate as defined by claim 12, at least some of the fluorinated monomer units comprising said polyolefin being completely fluorosubstituted.
Claim 15
Dependent Claim
37 words
The web substrate as defined by claim 12, at least some of the fluorinated monomer units comprising said polyolefin being completely halosubstituted with fluorine atoms and at least one chlorine, bromine or iodine atoms, or combination thereof.
Claim 16
Dependent Claim
21 words
The web substrate as defined by claim 12, said fluoropolymer comprising tetrafluoroethylene, hexafluoropropylene, chlorotrifluoroethylene or bromotrifluoroethylene monomer units, or combination thereof.
Claim 17
Dependent Claim
29 words
The web substrate as defined by claim 12, said fluoropolymer comprising up to 75% of ethylenically unsaturated monomer units having at least as many fluorine atoms as carbon atoms.
Claim 18
Dependent Claim
25 words
The web substrate as defined by claim 1, said fluorine-containing polymer binder comprising up to 60% by weight of the total weight of said web.
Claim 19
Dependent Claim
26 words
The web substrate as defined by claim 17, said fluorine-containing polymer binder comprising from 5 to 50% by weight of the total weight of said web.
Claim 20
Dependent Claim
14 words
The web substrate as defined by claim 1, comprising at least one electrocatalytic agent.
Claim 21
Dependent Claim
25 words
The web substrate as defined by claim 19, said at least one electrocatalytic agent comprising particulates having particle sizes ranging from 1 to 100 μm.
Claim 22
Dependent Claim
31 words
The web substrate as defined by claim 20, said electrocatalytic particulates comprising a platinum group metal, or a nickel-zinc, nickel-aluminum, titanium-nickel, molybdenum-nickel, sulfur-nickel, nickel-phosphorus, cobalt-molybdenum, or lanthanum-nickel alloy, or pair thereof.
Claim 23
Dependent Claim
28 words
The web substrate as defined by claim 19, said at least one electrocatalytic agent comprising up to 50% by weight of the total weight of the bonded web.
Claim 24
Dependent Claim
29 words
The web substrate as defined by claim 22, said at least one electrocatalytic agent comprising from 1 to 30% by weight of the total weight of the bonded web.
Claim 25
Dependent Claim
17 words
The web substrate as defined by claim 19, further comprising hydrophilic agents, conductive powders or nonconductive powders.
Claim 26
Dependent Claim
44 words
A web substrate as defined by claim 1 produced by a process comprising formulating a liquid suspension which comprises said fibers and said fluorine-containing polymer binder, forming a fibrous web by elimination of the liquid medium therefrom, and drying the fibrous web thus formed.
Claim 27
Dependent Claim
31 words
The web substrate defined by claim 25, said liquid suspension comprising at least one additive selected from among non-conductive fibers, conductive powder, non-conductive powder, hydrophilic agent, pore-forming agent, and catalytic agent.
Claim 28
Dependent Claim
45 words
The web substrate defined by claim 25, said liquid suspension being formulated by incorporating a dispersion of the fluorine-containing polymer binder into a dispersion of said fibers, the fibers being dispersed in from 1/5 to 1/2 of the final amount of the liquid dispersion medium.
Claim 29
Dependent Claim
24 words
The web substrate defined by claim 25, said fibrous web being formed by filtering said suspension through a highly porous material under programmed vacuum.
Claim 30
Dependent Claim
40 words
The web substrate of claim 28, wherein additives such as conductive powders, nonconductive powders, nonconductive fibers, hydrophilic agents, pore-forming agents and catalytic agents are in suspension and are introduced into said formed web by filtering the suspension through the web.
Claim 31
Dependent Claim
62 words
The web substrate defined by claim 25, comprising drying said fibrous web for from 1 to 24 hours at a temperature of from 70° to 120° C. and thence coherently bonding same by heating said dried web at a temperature from 5° to 50° C. higher than the melting or softening point of said fluorine-containing polymer for from 2 to 60 minutes.
Claim 32
Dependent Claim
12 words
A cathodic element comprising the web substrate as defined by claim 1.
Claim 33
Dependent Claim
12 words
The cathodic element as defined by claim 31, comprising an electrocatalytic agent.
Claim 34
Dependent Claim
13 words
The cathodic element as defined by claim 31, comprising an electrolysis diaphragm separator.
Claim 35
Dependent Claim
27 words
In an electrolytic cell comprising a cathode and an anode, the improvement which comprises utilizing as the cathode therefor, the cathodic element as defined by claim 31.
Claim 36
Dependent Claim
24 words
A cathodic element comprising a composite of an elementary cathode which includes a metallic surface and the web substrate as defined by claim 1.
Claim 37
Dependent Claim
39 words
The web substrate of claim 1, further comprising a pore forming agent of an alkali metal salt, an alkaline metal salt or amphoteric alumina or silica, which pore forming agents are removable by leaching or chemical or thermal decomposition.
Claim 38
Dependent Claim
32 words
The web substrate of claim 36, wherein the particle size of the pore-forming agent is rom 5-50 μm and used so as to provide a porosity of at least 90% or more.
Claim 39
Dependent Claim
30 words
The web substrate of claim 36, wherein the particle size of the pore-forming agent is from 5-50 μm and used so as to provide a porosity of 90% or less.
Claim 40
Dependent Claim
17 words
The web substrate as defined by claim 1, further comprising hydrophilic agents, conductive powders or nonconductive powders.
Claim 41
Dependent Claim
15 words
The web substrate as defined by claim 39, wherein the hydrophilic agent is sodium dioctylsulfosuccinate.
Claim 42
Dependent Claim
104 words
A bonded, coherent fibrous web substrate including a fibrous web matrix which comprises a plurality of fibers, at least a portion of which comprise electrically conductive fibers, and a binder consisting of a fluorine-containing polymer, said plurality of fibers being coherently bonded together with said fluorine-containing polymer, and said web substrate having a resistivity of up to about 0.4 Ω cm, wherein said web matrix comprises electrically non-conductive fibers having a resistivity in excess of 0.4 Ω cm, the diameters of which being less than about 1 mm and the lengths of which being in excess of about 0.5 mm and electrically conductive fibers.
Claim 43
Dependent Claim
104 words
A bonded, coherent fibrous web substrate including a fibrous web matrix which comprises a plurality of fibers, at least a portion of which comprise electrically conductive fibers, and a binder consisting of a fluorine-containing polymer, said plurality of fibers being coherently bonded together with said fluorine-containing polymer, and said web substrate having a resistivity of up to about 0.4 Ω cm, wherein said web matrix comprises electrically non-conductive fibers having a resistivity in excess of 0.4 Ω cm, the diameters of which being less than about 1 mm and the lengths of which being in excess of about 0.5 mm and electrically conductive fibers.
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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) | 1991-05-10 | 1991-11-09 | 1992-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-10 | 1995-11-09 | 1996-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-10 | 1999-11-09 | 2000-05-10 | $7700.00 | Window Closed / Lapsed |