Patent US570298A successfully refreshed from Google Patents.
US4078124A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laminated non-woven sheet
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1972-11-06
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Granted: 1978-03-07
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Expires: 1992-11-06
Abstract
Abstract A laminated non-woven sheet battery separator is made from non-woven mats of melt-blown thermoplastic polymer fibers. The non-woven sheets may be produced by either point welding or using adhesives to laminate at least one non-woven mat having a high strip tensile strength to at least one non-woven mat having a high tear resistance so that the sheets have both high strip tensile strength and high tear resistance.
Inventors
- 👤 James S. Prentice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:09
CPC Classifications
B; B32; B32B; B32B5/00; B32B5/22; B32B5/24; B32B5/26; B32B29/00; B32B29/02; B32B37/00; B32B37/10; D; D04; D04H; D04H1/00; D04H1/40; D04H1/54; D04H1/559; D04H1/56; D04H3/00; D04H3/08; D04H3/16; H; H01; H01M; H01M50/00; H01M50/40; H01M50/409; H01M50/411; H01M50/414; H01M50/44; H01M50/463; H01M50/489; H01M50/494; B32B2262/00; B32B2262/02; B32B2305/00; B32B2305/10; B32B2305/20; B32B2307/00; B32B2307/50; B32B2307/54; B32B2307/582; B32B2307/5825; B32B2309/00; B32B2309/02; B32B2457/00; B32B2457/10; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24826; Y10T442/00; Y10T442/60; Y10T442/69; Y10T442/692
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
247 words
A process for making a strong tear-resistant, non-woven sheet battery separator having a strip tensile strength of at least 400 dm 2 , which comprises the steps of: a) forming at least two dissimilar non-woven mats (A) and (B) comprised of the same thermoplastic polymer fibers and made by a melt-blown process, but having major differences in tear strength and tensile strength properties; and b) laminating at least one mat (A) with at least one mat (B), wherein said mat (A) has a strip tensile strength greater than 5000 m and a tear resistance of less than 300 dm 2 , and wherein said mat (A) has been prepared with air/polymer rates of more than 140, has a relatively high degree of self-bonding and has a fiber diameter of from 1 to 10 microns; and said mat (B) has a tear resistance of at least 1000 dm 2 and a tensile strength of less than 2000 m and wherein said mat (B) has been prepared with air to polymer rates of less than 50, has fiber diameters of about 10 to 40 microns and is relatively low in self-bonding but high in entanglements, wherein said mat (A) having the high strip tensile strength is obtained by heating under pressure at a temperature between about 270° to about 320° F and said mat (B) having a tear resistance at least 1000 dm 2 is obtained by heating under pressure at temperatures between about 200° to about 245° F.
Claim 2
Dependent Claim
247 words
A process for making a strong tear-resistant, non-woven sheet battery separator having a strip tensile strength of at least 400 dm 2 , which comprises the steps of: a) forming at least two dissimilar non-woven mats (A) and (B) comprised of the same thermoplastic polymer fibers and made by a melt-blown process, but having major differences in tear strength and tensile strength properties; and b) laminating at least one mat (A) with at least one mat (B), wherein said mat (A) has a strip tensile strength greater than 5000 m and a tear resistance of less than 300 dm 2 , and wherein said mat (A) has been prepared with air/polymer rates of more than 140, has a relatively high degree of self-bonding and has a fiber diameter of from 1 to 10 microns; and said mat (B) has a tear resistance of at least 1000 dm 2 and a tensile strength of less than 2000 m and wherein said mat (B) has been prepared with air to polymer rates of less than 50, has fiber diameters of about 10 to 40 microns and is relatively low in self-bonding but high in entanglements, wherein said mat (A) having the high strip tensile strength is obtained by heating under pressure at a temperature between about 270° to about 320° F and said mat (B) having a tear resistance at least 1000 dm 2 is obtained by heating under pressure at temperatures between about 200° to about 245° F.
Claim 3
Dependent Claim
34 words
A process according to claim 1 wherein said mat (A) having a high strip tensile strength is obtained by pressing it against a flat plate at temperatures between about 280° to about 300° F.
Claim 4
Dependent Claim
87 words
In a battery, a positive plate, a negative plate and a non-woven sheet of melt-blown thermoplastic fibers, said non-woven sheet positioned between and separating said positive and said negative plates and comprising a plurality of dissimilar non-woven mates laminated into said sheet, at least one of said mats (A) being comprised of fibers having diameters between 1-10 microns and having a strip tensile strength greater than 4000 m, and at least one other of said mats (B) having a tear resistance greater than 400 dm 2 .
Claim 5
Dependent Claim
87 words
In a battery, a positive plate, a negative plate and a non-woven sheet of melt-blown thermoplastic fibers, said non-woven sheet positioned between and separating said positive and said negative plates and comprising a plurality of dissimilar non-woven mates laminated into said sheet, at least one of said mats (A) being comprised of fibers having diameters between 1-10 microns and having a strip tensile strength greater than 4000 m, and at least one other of said mats (B) having a tear resistance greater than 400 dm 2 .
Claim 6
Dependent Claim
123 words
The battery of claim 3 wherein said non-woven mats (A) and (B) are comprised of fibers of the same thermoplastic polymer but having major differences in tear strength and tensile strength properties; mat (A) having a strip tensile strength greater than 5000 m and a tear resistance of less than 300 dm 2 , having been prepared with air/polymer rates of more than 140 and having a relatively high degree of self-bonding; and mat (B) having a tear resistance of at least 1000 dm 2 and a tensile strength of less than 2000 m, having been prepared with air to polymer rates of less than 50, having a diameter of about 10-40 microns and being relatively low in self-bonding but high in entanglements.
Claim 7
Dependent Claim
13 words
The battery of claim 3 wherein the fibers of mat (A) are fusion-bonded.
Claim 8
Dependent Claim
17 words
The battery of claim 3 wherein mat (A) is directly laminated to mat (B) by point welding.
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) | 1981-03-06 | 1981-09-05 | 1982-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-06 | 1985-09-05 | 1986-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-06 | 1989-09-05 | 1990-03-07 | $7700.00 | Window Closed / Lapsed |