Patent US4273840A successfully refreshed from Google Patents.
US4273840A
Expired / Lapsed
US
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Battery separator and method of producing the same
Assignee: Japan Atomic Energy Agency
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Filing: 1980-02-04
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Granted: 1981-06-16
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Expires: 2000-02-04
Abstract
Abstract A battery separator composed of a composite sheet of film to which a monomer having a hydrophilic or electrolytic group is grafted is disclosed. Said film consists of a first polymeric layer containing a substance capable of catching a metal ion dissolved from a positive or negative active material and a second polymeric layer integrally bonded to either one or both sides of the first polymeric layer and which contains no such substance or contains it in a smaller amount that that contained in said first polymeric layer. Also disclosed is a method of producing a battery separator by irradiating such composite sheet of film with ionizing radiation and immersing the irradiated film in a solution of a monomer containing a hydrophilic or electrolytic group or bringing it into contact with the monomer solution to thereby graft the monomer to the film.
Inventors
- 👤 Sueo Machi
- 👤 Isao Ishigaki
- 👤 Takanobu Sugo
- 👤 Kazuo Murata
- 👤 Shiro Tanso
- 👤 Keizi Senoo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:37
CPC Classifications
H; H01; H01M; H01M50/00; H01M50/40; H01M50/489; H01M50/409; H01M50/411; H01M50/414; H01M50/417; H01M50/449; H01M50/451; H01M50/454; H01M50/457; H01M2300/00; H01M2300/0002; H01M2300/0014; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
87 words
A battery separator comprising: a first layer of polymer having two major sides and containing a substance capable of catching a positive or negative active material in a metal ionic form, at least one second layer integrally bonded to at least one of said sides of the first layer of polymer forming a composite sheet of film and which contains no more such substance than that contained in said first layer of polymer, and a monomer having hydrophilic or electrolytic group grafted to said sheet of film.
Claim 2
Dependent Claim
87 words
A battery separator comprising: a first layer of polymer having two major sides and containing a substance capable of catching a positive or negative active material in a metal ionic form, at least one second layer integrally bonded to at least one of said sides of the first layer of polymer forming a composite sheet of film and which contains no more such substance than that contained in said first layer of polymer, and a monomer having hydrophilic or electrolytic group grafted to said sheet of film.
Claim 3
Dependent Claim
27 words
A battery separator according to claim 1 wherein said substance capable of catching a positive or negative active material in a metal ionic form is a sulfide.
Claim 4
Dependent Claim
13 words
A battery separator according to claim 2, wherein said polymer is a polyolefin.
Claim 5
Dependent Claim
31 words
A battery separator according to claim 3, wherein said first and second layers are made integral by bonding them together with at least one of them being in a molten state.
Claim 6
Dependent Claim
31 words
A battery separator according to claim 2, wherein said first and second layers are made integral by bonding them together with at least one of them being in a molten state.
Claim 7
Dependent Claim
31 words
A battery separator according to claim 1, wherein said second layer of polymer is completely free of substances capable of catching positive or negative active material in a metal ionic form.
Claim 8
Dependent Claim
30 words
A battery separator according to claims 1 or 6 wherein said substance capable of catching a positive or negative active material in a metal ionic form is a calcium compound.
Claim 9
Dependent Claim
18 words
A battery separator according to any one of claims 1 to 7 wherein the polymer is a polyolefin.
Claim 10
Dependent Claim
31 words
A battery separator according to claim 8, wherein said first and second layers are made integral by bonding them together with at least one of them being in a molten state.
Claim 11
Dependent Claim
13 words
A battery separator according to claim 7, wherein said polymer is a polyolefin.
Claim 12
Dependent Claim
31 words
A battery separator according to claim 10, wherein said first and second layers are made integral by bonding them together with at least one of them being in a molten state.
Claim 13
Dependent Claim
31 words
A battery separator according to claim 7, wherein said first and second layers are made integral by bonding them together with at least one of them being in a molten state.
Claim 14
Dependent Claim
34 words
A battery separator according to claims 1 or 6 wherein said first and second polymeric layers are made integral by bonding them together with at least one of them being in a molten state.
Claim 15
Dependent Claim
34 words
A battery separator according to claim 1 or 6, wherein said at least one second layer of polymer consists of two such layers, respectively bonded to respective said major sides of said first layer.
Claim 16
Independent Claim
120 words
A method of producing the battery separator in form of a composite sheet of film having a first layer of polymer with two major sides and containing a substance capable of catching a positive or negative active material in a metal ionic form and at least one second layer of polymer integrally bonded to at least one of the major sides of the first layer of polymer and which contains no more such substance than that contained in the first layer of polymer, the method comprising irradiating the sheet of film with ionizing radiation and immersing the irradiated sheet in a solution of a monomer containing a hydrophilic or electrolytic group to graft the monomer to the sheet of film.
Claim 17
Independent Claim
120 words
A method of producing the battery separator in form of a composite sheet of film having a first layer of polymer with two major sides and containing a substance capable of catching a positive or negative active material in a metal ionic form and at least one second layer of polymer integrally bonded to at least one of the major sides of the first layer of polymer and which contains no more such substance than that contained in the first layer of polymer, the method comprising irradiating the sheet of film with ionizing radiation and immersing the irradiated sheet in a solution of a monomer containing a hydrophilic or electrolytic group to graft the monomer to the sheet of film.
Claim 18
Dependent Claim
32 words
A method according to claim 15, including providing said second layer of polymer as a layer completely free of substances capable of catching positive or negative active material in metal ionic form.
Claim 19
Independent Claim
122 words
A method of producing the battery separator in form of a composite sheet of film having a first layer of polymer with two major sides and containing a substance capable of catching a positive or negative active material in a metal ionic form and at least one second layer of polymer integrally bonded to at least one of the major sides of the first layer of polymer and which contains no more such substance than that contained in the first layer of polymer, the method comprising irradiating the sheet of film with ionizing radiation, and bringing the irradiated sheet into contact with a solution of a monomer containing a hydrophilic or electrolytic group to graft the monomer to the sheet of film.
Claim 20
Independent Claim
122 words
A method of producing the battery separator in form of a composite sheet of film having a first layer of polymer with two major sides and containing a substance capable of catching a positive or negative active material in a metal ionic form and at least one second layer of polymer integrally bonded to at least one of the major sides of the first layer of polymer and which contains no more such substance than that contained in the first layer of polymer, the method comprising irradiating the sheet of film with ionizing radiation, and bringing the irradiated sheet into contact with a solution of a monomer containing a hydrophilic or electrolytic group to graft the monomer to the sheet of film.
Claim 21
Dependent Claim
33 words
A method according to claim 17, including providing said second layer of polymer as a layer completely free of substances capable of catching positive or negative active material in a metal ionic form.
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) | 1984-06-15 | 1984-12-15 | 1985-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-15 | 1988-12-15 | 1989-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-15 | 1992-12-15 | 1993-06-16 | $7700.00 | Window Closed / Lapsed |