Patent US4389494A successfully refreshed from Google Patents.
US4389494A
Expired / Lapsed
US
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Process for producing a membrane for electrolysis by forming removable thin layer upon electrode
Assignee: AGC Inc
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Filing: 1981-07-15
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Granted: 1983-06-21
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Expires: 2001-07-15
Abstract
Abstract An ion exchange membrane for an electrolysis is produced by forming a removable thin layer on a surface of a perforated electrode; forming a layer of a thermoplastic fluorinated polymer having ion exchange groups or functional groups convertible to ion exchange groups on said removable thin layer; converting said layer of a thermoplastic fluorinated polymer into a liquid impermeable membrane; and removing said removable thin layer, and if necessary, converting said functional groups into ion exchange groups.
Inventors
- 👤 Manabu Suhara
- 👤 Tomoki Gunjima
- 👤 Haruhisa Miyake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:16
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/20; C08J5/22; C08J5/2206; C08J5/2218; C08J5/2231; C08J5/2237; C25; C25B; C25B13/00; C25B9/00; C25B9/17; C25B9/19; C08J2327/00; C08J2327/02; C08J2327/12; C08J2327/18
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
98 words
A process for producing an ion exchange membrane for electrolysis which comprises forming a removable thin layer of polyacrylate, polyvinylalcohol optionally mixed with inorganic fiber on a surface of a perforated electrode; forming a layer of a thermoplastic fluorinated polymer having ion exchange groups or functional groups convertible to ion exchange groups on said removable thin layer; converting said layer of a thermoplastic fluorinated polymer into a liquid impermeable membrane; and removing said removable thin layer by treating with an aqueous solution of an alkali metal hydroxide, and if necessary, converting said functional groups into ion exchange groups.
Claim 2
Dependent Claim
98 words
A process for producing an ion exchange membrane for electrolysis which comprises forming a removable thin layer of polyacrylate, polyvinylalcohol optionally mixed with inorganic fiber on a surface of a perforated electrode; forming a layer of a thermoplastic fluorinated polymer having ion exchange groups or functional groups convertible to ion exchange groups on said removable thin layer; converting said layer of a thermoplastic fluorinated polymer into a liquid impermeable membrane; and removing said removable thin layer by treating with an aqueous solution of an alkali metal hydroxide, and if necessary, converting said functional groups into ion exchange groups.
Claim 3
Dependent Claim
36 words
The process according to claim 1 wherein said removable thin layer contains a a metal and said thin layer of said metal is removed by treating with an aqueous solution of an acid or a base.
Claim 4
Dependent Claim
54 words
The process according to claim 1 wherein said thermoplastic fluorinated polymer having ion exchange groups or functional groups convertible to ion exchange groups is used in a form of an aqueous dispersion of said fluorinated polymer which is converted into an organic medium dispersion by replacing said aqueous solution to a hydrophilic organic medium.
Claim 5
Dependent Claim
30 words
The process according to claim 1 or 3 wherein said fluorinated polymer layer is converted into a liquid impermeable membrane by heating it at 40° to 160° C. thin layer.
Claim 6
Dependent Claim
31 words
The process according to claim 3 wherein a liquid permeability of said liquid impermeable membrane is upto 0.3 cc/cm 2 . minute under a pressure difference of 100 cmH 2 O.
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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) | 1986-06-20 | 1986-12-20 | 1987-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-20 | 1990-12-20 | 1991-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-20 | 1994-12-20 | 1995-06-21 | $7700.00 | Window Closed / Lapsed |