US5158844A
Expired / Lapsed
US
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Battery separator
Assignee: AHLSTROM DEXTER LLC
•
Filing: 1991-03-07
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Granted: 1992-10-27
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Expires: 2011-03-07
Abstract
Abstract A battery separator in the form of a nonwoven fibrous web of water dispersible fibers incorporates up to 65% by weight of fibers having a high cross-sectional aspect ratio. The high aspect ratio fibers include collapsible hollow fibers and ribbon fibers that have a width five to ten times greater than their thickness. These fibers provide reduced thickness at the same basis weight and a synergistic reduction in shrinkage when combined with lower denier solid fibers.
Inventors
- 👤 Vicky L. Hagens
- 👤 Richard P. James
- 👤 Vaughan R. Annis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:20
CPC Classifications
H; H01; H01M; H01M50/00; H01M50/40; H01M50/409; H01M50/411; H01M50/414; H01M50/44; H01M50/429; H01M50/4295; H01M50/489; H01M50/491; H01M50/494; H01M2300/00; H01M2300/0002; H01M2300/0014; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
59 words
In a battery separator for an electric storage cell comprising a nonwoven web consisting essentially of water dispersible fibers bonded with a minor amount of a synthetic binder, the improvement wherein the water-dispersible fibers include at least 5 percent by weight of synthetic fibers having a cross-sectional aspect ratio of greater than 2 uniformly distributed throughout the nonwoven web.
Claim 2
Dependent Claim
59 words
In a battery separator for an electric storage cell comprising a nonwoven web consisting essentially of water dispersible fibers bonded with a minor amount of a synthetic binder, the improvement wherein the water-dispersible fibers include at least 5 percent by weight of synthetic fibers having a cross-sectional aspect ratio of greater than 2 uniformly distributed throughout the nonwoven web.
Claim 3
Dependent Claim
16 words
The separator of claim 1 wherein a major portion of the water dispersible fibers is cellulosic.
Claim 4
Dependent Claim
16 words
The separator of claim 1 wherein a major portion of the water dispersible fibers is synthetic.
Claim 5
Dependent Claim
20 words
The separator of claim 1 wherein the high cross-sectional aspect fibers constitute up to 100% of the water dispersible fibers.
Claim 6
Dependent Claim
36 words
The separator of claim 1 wherein the water dispersible fibers are a mixture of cellulosic and synthetic fibers, said high cross-sectional aspect fibers comprising 5-60% by weight of the total fiber content of the nonwoven web.
Claim 7
Dependent Claim
22 words
The separator of claim 5 wherein the web has a thickness increase of substantially less than 10 percent in a alkaline environment.
Claim 8
Dependent Claim
23 words
The separator of claim 1 wherein said high aspect fibers are selected from the group consisting of ribbon fibers and collapsed hollow fibers.
Claim 9
Dependent Claim
26 words
The separator of claim 1 wherein the high aspect fibers are collapsed hollow fibers and comprise 10% to 45% of the fiber content of the web.
Claim 10
Dependent Claim
24 words
The separator of claim 1 wherein the high aspect fibers have a width to thickness ratio in a range extending from 2 to 20.
Claim 11
Dependent Claim
26 words
The separator of claim 1 wherein the high aspect fibers are cellulosic fibers having a width to thickness ratio greater than 2 and less than 10.
Claim 12
Dependent Claim
32 words
The separator of claim 1 wherein the high aspect fibers have a denier in the range of 0.5 to 15 dpf. and a length within the range of 2 to 30 mm.
Claim 13
Dependent Claim
24 words
The separator of claim 1 wherein the binder constitutes less than 30% by weight of the nonwoven web and is comprised of binder fibers.
Claim 14
Dependent Claim
13 words
The separator of claim 1 wherein the binder is a soluble thermoplastic material.
Claim 15
Dependent Claim
17 words
The separator of claim 1 wherein the binder constitutes 3 to 20% by weight of the web.
Claim 16
Dependent Claim
26 words
The separator of claim 1 wherein the web has a thickness of less than 10 mils and an average pore size of less than 100 microns.
Claim 17
Dependent Claim
85 words
In a battery separator for an electric storage cell comprising a nonwoven web consisting essentially of water dispersable fibers bonded with a minor amount of a synthetic binder, the improvement wherein the water dispersable fibers include regular fibers and at least five percent by weight of high cross-sectional aspect ratio fibers of the same composition uniformly distributed throughout the nonwoven web, the high aspect ratio fibers being collapsed hollow fibers and the regular fibers being of a lower denier than the high aspect ratio fibers.
Claim 18
Dependent Claim
85 words
In a battery separator for an electric storage cell comprising a nonwoven web consisting essentially of water dispersable fibers bonded with a minor amount of a synthetic binder, the improvement wherein the water dispersable fibers include regular fibers and at least five percent by weight of high cross-sectional aspect ratio fibers of the same composition uniformly distributed throughout the nonwoven web, the high aspect ratio fibers being collapsed hollow fibers and the regular fibers being of a lower denier than the high aspect ratio fibers.
References Cited (Backward Citations)
US3121658A
Cited
US3418405A
Cited
US3476602A
Cited
US3573994A
Cited
US3557962A
Cited
US3626045A
Cited
US3914501A
Cited
US3716411A
Cited
US3915750A
Cited
US3791868A
Cited
US4130689A
Cited
US4242411A
Cited
US4279979A
Cited
US4224386A
Cited
US4286030A
Cited
US4746586A
Cited
US4734344A
Cited
US4767687A
Cited
US4812145A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-10-27 | 1996-04-27 | 1996-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-10-27 | 2000-04-27 | 2000-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-10-27 | 2004-04-27 | 2004-10-27 | $7700.00 | Window Closed / Lapsed |