US4539277A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ion exchange membrane and process for producing the same
Assignee: Japan Atomic Energy Agency
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Filing: 1983-11-15
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Granted: 1985-09-03
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Expires: 2003-11-15
Abstract
Abstract A separator membrane for use in secondary alkali batteries having a non-ion selective hydrophilic group and ion exchange group said membrane having an electrical resistance which, when said membrane is heated in 12NaOH for 30 minutes at a temperature between about 20 DEG and 100 DEG C., varies from the initial value for 20 DEG C. by an amount between 10% and about 24% and the process thereof are herein disclosed.
Inventors
- 👤 Isao Ishigaki
- 👤 Takanobu Sugo
- 👤 Jiro Okamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:25
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/20; C08J5/22; C08J5/2206; C08J5/2218; H; H01; H01M; H01M50/00; H01M50/40; H01M50/409; H01M50/411; H01M50/414; H01M50/417; H01M50/423; H01M50/489; H01M50/497; H01M2300/00; H01M2300/0002; H01M2300/0014; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y02P; Y02P70/00; Y02P70/50
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
71 words
A separator membrane for use in secondary alkali batteries, said membrane comprising a hydrocarbon-or non-fluorine halogen-containing polymer substrate having a non-ion selective hydrophilic group and ion exchange group, said membrane having an electrical resistance which, when said membrane is heated in 12N NaOH for 30 minutes at a temperature between about 20° and 100° C., varies from the initial value for 20° C. by an amount between 10% and about 24%.
Claim 2
Dependent Claim
71 words
A separator membrane for use in secondary alkali batteries, said membrane comprising a hydrocarbon-or non-fluorine halogen-containing polymer substrate having a non-ion selective hydrophilic group and ion exchange group, said membrane having an electrical resistance which, when said membrane is heated in 12N NaOH for 30 minutes at a temperature between about 20° and 100° C., varies from the initial value for 20° C. by an amount between 10% and about 24%.
Claim 3
Dependent Claim
27 words
A separator membrane according to claim 1, wherein said substrate is selected from the group consisting of polyethylene, polypropylene, polybutadiene, polyethylene terephthalate, polyvinyl chloride, polyamide and polyester.
Claim 4
Dependent Claim
30 words
A separator membrane according to claim 1, wherein said non-ion selective hydrophilic group is provided by the grafting onto said substrate of a hydrophilic vinyl compound containing an hydroxyl group.
Claim 5
Dependent Claim
37 words
A separator membrane according to claim 3, wherein said monomer is selected from the group consisting of 2-hydroxyethyl methacrylate, 2-hydroxyethyl acrylate, alkyl alcohol, polyethylene glycol acrylate, polyethylene glycol methacrylate, polyethylene glycol diacrylate, polyethylene glycol dimethacrylate, and N-vinyl-pyrrolidone.
Claim 6
Dependent Claim
49 words
A separator membrane according to claim 1, wherein said non-ion selectric hydrophilic group is provided by grafting onto said substrate a monomer selected from the group consisting of vinyl acetate, allyl acetate and allyl formate, and converting said grafted monomer to non-ion selectric hydrophilic groups by hydrolysis after grafting.
References Cited (Backward Citations)
US4200538A
Cited
US4302334A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-09-02 | 1989-03-04 | 1989-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-02 | 1993-03-04 | 1993-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-02 | 1997-03-04 | 1997-09-03 | $7700.00 | Window Closed / Lapsed |