US4287276A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkaline battery with separator of high surface area
Assignee: Daramic LLC
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Filing: 1979-06-08
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Granted: 1981-09-01
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Expires: 1999-06-08
Abstract
Abstract The instant invention is directed to battery separator membranes useful in alkaline battery systems formed from a homogeneous admixture of a polyolefin, a plasticizer, and a filler selected from particulate material having a surface area of from 100 to 385 m2/cc and a pore volume of at least 0.075 cc/gm.
Inventors
- 👤 Joseph T. Lundquist, Jr.
- 👤 Christian B. Lundsager
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:29
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22; C08K3/02; C08K3/04; C08K5/00; C08K5/0008; C08K5/0016; H; H01; H01M; H01M50/00; H01M50/40; H01M50/409; H01M50/411; H01M50/414; H01M50/417; H01M50/489; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y02P; Y02P70/00; Y02P70/50
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
110 words
In an alkaline battery system having positive electrodes, negative electrodes, an alkaline electrolyte and separator membrane positioned between positive and negative electrode pairs, wherein the improvement comprising separator membranes, each having a thickness of less than about 10 mils and formed from an admixture of from 7 to 30 weight percent polyolefin having an average molecular weight of at least 100,000; from 0 to 15 weight percent plasticizer; and from 50 to 93 weight percent of a filler selected from titania, alumina, magnesium hydroxide or calcium hydroxide, said filler having a surface area of from 100 to 385 m 2 /cc and a pore volume of at least 0.075 cc/gm.
Claim 2
Dependent Claim
110 words
In an alkaline battery system having positive electrodes, negative electrodes, an alkaline electrolyte and separator membrane positioned between positive and negative electrode pairs, wherein the improvement comprising separator membranes, each having a thickness of less than about 10 mils and formed from an admixture of from 7 to 30 weight percent polyolefin having an average molecular weight of at least 100,000; from 0 to 15 weight percent plasticizer; and from 50 to 93 weight percent of a filler selected from titania, alumina, magnesium hydroxide or calcium hydroxide, said filler having a surface area of from 100 to 385 m 2 /cc and a pore volume of at least 0.075 cc/gm.
Claim 3
Dependent Claim
32 words
The system of claim 1 wherein the separator composition further contains up to 10 weight percent of a conductive carbon black having a surface area of at least 100 m 2 /cc.
Claim 4
Dependent Claim
34 words
The system of claim 1 or 2 wherein the filler is titania having a surface area of from 125 to 385 m 2 /cc and a pore volume of from 0.08 to 0.8 cc/gm.
Claim 5
Dependent Claim
34 words
The system of claim 1 or 2 wherein the filler is alumina having a surface area of from 125 to 385 m 2 /cc and a pore volume of from 0.08 to 0.8 cc/gm.
Claim 6
Dependent Claim
35 words
The system of claim 1 or 2 wherein the filler is magnesium hydroxide having a surface area of from 125 to 385 m 2 /cc and a pore volume of from 0.08 to 0.8 cc/gm.
Claim 7
Dependent Claim
35 words
The system of claim 1 or 2 wherein the filler is calcium hydroxide having a surface area of from 125 to 385 m 2 /cc and a pore volume of from 0.08 to 0.8 cc/gm.
Claim 8
Dependent Claim
34 words
The system of claim 1 or 2 wherein the filler is titania having a surface area of from 180 to 325 m 2 /cc and a pore volume of from 0.1 to 0.4 cc/gm.
Claim 9
Dependent Claim
33 words
The system of claim 1 or 2 wherein the filler is titania having a surface area from 200 to 300 m 2 /cc and a pore volume of from 0.1 to 0.4 cc/gm.
Claim 10
Dependent Claim
44 words
The system of claim 1 or 2 wherein the polyolefin comprises a major amount of a polyolefin having an average molecular weight of from 100,000 to 500,000 and a minor amount of a polyolefin having an average molecular weight of from 500,000 to 2,000,000.
Claim 11
Dependent Claim
49 words
The system of claim 1 or 2 wherein the polyolefin is a mixture of from 5 to 95 percent of a polyolefin having an average molecular weight of from 100,000 to 500,000 and the remaining amount being a polyolefin having an average molecular weight of from 500,000 to 2,000,000.
Claim 12
Dependent Claim
17 words
The system of claim 1 or 2 wherein the system is a Ni-Zn secondary alkaline battery system.
Claim 13
Dependent Claim
17 words
The system of claim 1 or 2 wherein the system is a Ni-Fe secondary alkaline battery system.
Claim 14
Dependent Claim
50 words
The system of claim 1 or 2 wherein the polyolefin is a copolymer selected from the group consisting of copolymers of a mixture of hydrocarbon olefinic monomers or copolymers of a mixture of at least 90 weight percent hydrocarbon olefinic monomer and up to 10 percent acrylic acid or ester.
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) | 1984-08-31 | 1985-03-02 | 1985-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-31 | 1989-03-02 | 1989-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-31 | 1993-03-02 | 1993-09-01 | $7700.00 | Window Closed / Lapsed |