US4113922A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Trifluorostyrene sulfonic acid membranes
Assignee: Occidental Chemical Corp
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Filing: 1977-11-10
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Granted: 1978-09-12
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Expires: 1997-11-10
Abstract
Abstract This disclosure is directed to fluorocarbon polymers, polymeric membranes, and electrochemical cells and processes. The polymers and membranes are produced by radiation techniques to provide improved products. For example, α,β,β-trifluorostyrene in an inert organic solvent is grafted onto an inert film, such as tetrafluoroethylene-hexafluoropropylene copolymer, by irradiation, i.e. with Co-60 gamma radiation at a dose of several Mrad. The grafted film is then sulfonated, preferably in a chlorosulfonic acid bath. The resulting film is useful as a membrane or diaphragm in various electrochemical cells such as chlor-alkali or fuel cells.
Inventors
- 👤 Vincent F. D'Agostino
- 👤 Joseph Y. Lee
- 👤 Edward H. Cook, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:50
CPC Classifications
B; B01; B01D; B01D71/00; B01D71/06; B01D71/30; B01D71/32; B01D67/00; B01D67/0081; B01D67/0093; B01D67/00931; C; C08; C08F; C08F291/00; C08J; C08J5/00; C08J5/20; C08J5/22; C08J5/2206; C08J5/2218; C08J5/2231; C08J5/2243; C08J5/225; C08J7/00; C08J7/12; C08J7/16; H; H01; H01M; H01M8/00; H01M8/10; H01M8/1016; H01M8/1018; H01M8/102; H01M8/1023; H01M8/1039; H01M8/1058; H01M8/106; H01M8/1069; H01M8/1086; H01M8/1088; B01D2323/00; B01D2323/38; B01D2323/385; C08J2327/00; C08J2327/02; C08J2327/12; H01M8/1004; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50; Y02P; Y02P70/00; Y02P70/50
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
27 words
In a fuel cell, the improvement comprising a separator having: a. an inert polymeric base film; and b. sulfonated α, β, β-trifluorostyrene irradiation grafted on said film.
Claim 2
Dependent Claim
27 words
In a fuel cell, the improvement comprising a separator having: a. an inert polymeric base film; and b. sulfonated α, β, β-trifluorostyrene irradiation grafted on said film.
Claim 3
Dependent Claim
37 words
The fuel cell of claim 1 wherein said inert polymeric base film is selected from the group consisting of polypropylene film, polyethylene film, polytetrafluoroethylene film, polytrifluorochloroethylene film, tetrafluoroethylenehexafluoropropylene copolymer film, tetrafluoroethylene-ethylene copolymer film and laminated films thereof.
Claim 4
Dependent Claim
20 words
The fuel cell of claim 1 wherein the percentage graft is in the range of about 3 to about 50%.
Claim 5
Dependent Claim
20 words
The fuel cell of claim 3, wherein the percentage sulfonation is in the range of about 5 to about 25%.
Claim 6
Dependent Claim
34 words
In a fuel cell, the improvement comprising a separator having: a. an inert polymeric film b. a perfluoro vinyl monomer irradiation-grafted on said film, and c. a pendant ion-exchange group on said vinyl monomer.
Claim 7
Dependent Claim
34 words
In a fuel cell, the improvement comprising a separator having: a. an inert polymeric film b. a perfluoro vinyl monomer irradiation-grafted on said film, and c. a pendant ion-exchange group on said vinyl monomer.
References Cited (Backward Citations)
US3592695A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-09-11 | 1982-03-13 | 1982-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-11 | 1986-03-13 | 1986-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-11 | 1990-03-13 | 1990-09-12 | $7700.00 | Window Closed / Lapsed |