Patent US4217198A successfully refreshed from Google Patents.
US4217198A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coated perfluorosulfonic acid resin membranes and a method for their preparation
Assignee: Olin Corp
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Filing: 1979-03-23
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Granted: 1980-08-12
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Expires: 1999-03-23
Abstract
Abstract An improved cation-exchange membrane for use in electrolytic processes which is comprised of a film of a perfluorosulfonic acid resin having a fluoroalkyl resin coating. The improved membrane is produced by applying an uncured fluoroalkyl resin in liquid form to a surface of the film and curing the fluoroalkyl resin to provide a solid coating on the surface of the film. The improved membrane provides efficient ion separation properties at reduced costs for energy.
Inventors
- 👤 Igor V. Kadija
- 👤 Kenneth E. Woodard, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:31
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/20; C08J5/22; C08J5/2287; C08J5/2293; C08J2327/00; C08J2327/02; C08J2327/12
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
21 words
A membrane for use in electrolytic processes comprised of a film of a perfluorosulfonic acid resin having a fluoroalkyl resin coating.
Claim 2
Dependent Claim
21 words
A membrane for use in electrolytic processes comprised of a film of a perfluorosulfonic acid resin having a fluoroalkyl resin coating.
Claim 3
Dependent Claim
22 words
The membrane of claim 1 in which said perfluorosulfonic acid resin has an equivalent weight of from about 900 to about 1600.
Claim 4
Dependent Claim
34 words
The membrane of claim 2 in which said perfluorosulfonic acid resin is coated with said fluoroalkyl resin in an amount of from about 0.5 to about 15 grams per square meter of said membrane.
Claim 5
Dependent Claim
27 words
The membrane of claim 3 in which said fluoroalkyl resin includes a fluoroalkyl group having from about 3 to about 15 carbon atoms in said alkyl group.
Claim 6
Dependent Claim
22 words
The membrane of claim 4 in which said perfluorosulfonic acid resin has an equivalent weight of from about 1100 to about 1500.
Claim 7
Dependent Claim
33 words
The membrane of claim 5 in which said perfluorosulfonic acid resin is coated with said fluoroalkyl resin in an amount of from about 2 to about 10 grams per square meter of membrane.
Claim 8
Dependent Claim
49 words
A process for producing membranes for use in electrolysis processes which comprises applying an uncured fluoroalkyl resin to the surface of a film of a perfluorosulfonic acid resin to provide a coating of said fluoroalkyl resin and curing said fluoroalkyl resin to provide a solid coating on said surface.
Claim 9
Dependent Claim
49 words
A process for producing membranes for use in electrolysis processes which comprises applying an uncured fluoroalkyl resin to the surface of a film of a perfluorosulfonic acid resin to provide a coating of said fluoroalkyl resin and curing said fluoroalkyl resin to provide a solid coating on said surface.
Claim 10
Dependent Claim
39 words
The process of claim 7 in which said surface of said film of perfluorosulfonic acid resin is maintained at a temperature in the range from ambient to about 200° C. for a sufficient time to cure said fluoroalkyl resin.
Claim 11
Dependent Claim
25 words
The process of claim 7 in which said fluoroalkyl resin is applied to said surface of said film of perfluorosulfonic acid resin in aerosol form.
Claim 12
Dependent Claim
23 words
An electrolytic cell for the electrolysis of aqueous solutions of alkali metal chlorides employing the coated membrane of claims 1, 3, or 6.
References Cited (Backward Citations)
US3849521A
Cited
US3838104A
Cited
US3997507A
Cited
US3909378A
Cited
FR2300144B1
Cited
US4100340A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-08-12 | 1984-02-11 | 1984-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-12 | 1988-02-11 | 1988-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-12 | 1992-02-11 | 1992-08-12 | $7700.00 | Window Closed / Lapsed |