US4076571A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of bonding electrolytic diaphragms of perfluorosulfonic acid resins
Assignee: Olin Corp
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Filing: 1976-10-19
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Granted: 1978-02-28
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Expires: 1996-10-19
Abstract
Abstract A method of restoring elasticity to heat sealed portions of an elecrolytic diaphragm comprised of a perfluorosulfonic acid resin in the alkali metal ion form comprises contacting the heat sealed sections with an aqueous fluid.
Inventors
- 👤 Steven J. Specht
- 👤 John O. Adams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:20
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/12; B29; B29C; B29C65/00; B29C65/48; B29C66/00; B29C66/70; B29C66/72; B29C66/723; B32B27/28; B32B27/286; H; H01; H01G; H01G9/00; H01G9/004; H01G9/02; B29C66/71; B32B2309/00; B32B2309/08; B32B2309/10; B32B2309/105; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/3154
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
57 words
In a method for heat sealing an electrolytic diaphragm comprised of a perfluorosulfonic acid resin in the alkali metal ion form, said method comprising heat sealing juxtaposed sections of said electrolytic diaphragm, the improvement which comprises contacting said heat sealed sections of said electrolytic diaphragm with an aqueous fluid to restore elasticity to said heat sealed sections.
Claim 2
Dependent Claim
57 words
In a method for heat sealing an electrolytic diaphragm comprised of a perfluorosulfonic acid resin in the alkali metal ion form, said method comprising heat sealing juxtaposed sections of said electrolytic diaphragm, the improvement which comprises contacting said heat sealed sections of said electrolytic diaphragm with an aqueous fluid to restore elasticity to said heat sealed sections.
Claim 3
Dependent Claim
12 words
The method of claim 1 in which said aqueous fluid is water.
Claim 4
Dependent Claim
12 words
The method of claim 1 in which said aqueous fluid is steam.
Claim 5
Dependent Claim
22 words
The method of claim 1 in which said aqueous fluid is a solution containing at least 10 percent by weight of water.
Claim 6
Dependent Claim
16 words
The method of claim 4 in which said aqueous fluid is a solution of ethyl alcohol.
Claim 7
Dependent Claim
66 words
The method of claim 2 in which said perfluorosulfonic acid resin is comprised of a hydrolyzed copolymer of a perfluoroolefin and a fluorosulfonated perfluorovinyl ether of the formula CF 2 ═CFOR f SO 2 F where R f is a bifunctional perfluorinated radical having from 1 to about 8 carbon atoms; and said hydrolyzed copolymer having an equivalent weight of from about 900 to about 1,600.
Claim 8
Dependent Claim
14 words
The method of claim 6 in which said alkali metal is sodium or potassium.
Claim 9
Dependent Claim
15 words
The method of claim 7 in which said fluorosulfonated perfluorovinyl ether is perfluoro (3,6-dioxa-4-methyl-7-octenesulfonyl fluoride).
Claim 10
Dependent Claim
18 words
The method of claim 6 in which said perfluorosulfonic acid resin is attached to a polytetrafluoroethylene support material.
Claim 11
Independent Claim
140 words
A method for heat sealing two sections of an electrolytic diaphragm material comprised of a hydrolyzed copolymer of a perfluoroolefin and a fluorosulfonated perfluorovinyl ether of the formula CF 2 ═CFOR f SO 2 F where R f is a bifunctional perfluoroalkyl radical having from 1 to about 8 carbon atoms, said hydrolyzed copolymer having an equivalent weight of from about 900 to about 1,600, said hydrolyzed copolymer being in the alkali metal ion form, said method comprising: (a) contacting two juxtaposed sections of said diaphragm materials, (b) applying heat under controlled conditions to said sections to provide a temperature of from about 200° to about 370° C., (c) applying pressure to said heated sections of from about 1 to about 10 kg/cm 2 to heat seal said sections, and (d) contacting said heat sealed sections with an aqueous fluid.
Claim 12
Independent Claim
140 words
A method for heat sealing two sections of an electrolytic diaphragm material comprised of a hydrolyzed copolymer of a perfluoroolefin and a fluorosulfonated perfluorovinyl ether of the formula CF 2 ═CFOR f SO 2 F where R f is a bifunctional perfluoroalkyl radical having from 1 to about 8 carbon atoms, said hydrolyzed copolymer having an equivalent weight of from about 900 to about 1,600, said hydrolyzed copolymer being in the alkali metal ion form, said method comprising: (a) contacting two juxtaposed sections of said diaphragm materials, (b) applying heat under controlled conditions to said sections to provide a temperature of from about 200° to about 370° C., (c) applying pressure to said heated sections of from about 1 to about 10 kg/cm 2 to heat seal said sections, and (d) contacting said heat sealed sections with an aqueous fluid.
Claim 13
Dependent Claim
12 words
The method of claim 10 in which said aqueous fluid is water.
Claim 14
Dependent Claim
22 words
The method of claim 11 in which said fluorosulfonated perfluorovinyl ether is perfluoro(3,6-dioxa-4-methyl-7-octenesulfonyl fluoride) and said alkali metal is sodium or potassium.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-27 | 1981-08-29 | 1982-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-27 | 1985-08-29 | 1986-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-27 | 1989-08-29 | 1990-02-28 | $7700.00 | Window Closed / Lapsed |