IP Library › Granted Patent US 12,749,768
Granted Patent B2
US 12,749,768 · App. 18/327,762 · Granted Sep 29, 2026

Fine glass fibers and fiber webs, separators, and pasting papers comprising them

Inventors: Nicolas Clement (Littleton, MA); Amogh N. Karwa (Lexington, MA); John A. Wertz (Hollis, NH); John J. Herrington, III (Corvallis, OR); Asif Masih Sharazi (Bonaire, GA)
Assignee: Hollingsworth & Vose Company
H01M50/44H01M50/437H01M50/494
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Quick Facts
Patent No.
US 12,749,768
App. No.
18/327,762
Granted
Sep 29, 2026
Kind
B2
Abstract

Fine glass fibers, as well as fiber webs, separators, and pasting papers comprising the fine glass fibers, are generally described. In some embodiments, the fine glass fibers have a relatively high BET specific surface area (e.g., greater than or equal to 1.6 m 2 /g) while maintaining a relatively low aspect ratio (e.g., less than or equal to 80).

Claims (41)

1 . A battery separator, comprising:

a fiber web comprising fine glass fibers;

wherein the fine glass fibers have an average diameter of less than 1.6 microns, an average aspect ratio of less than or equal to 80, and an average BET specific surface area of greater than or equal to 1.6 m 2 /g; and

wherein the fiber web has a basis weight of greater than or equal to 20 g/m 2 and less than or equal to 600 g/m 2 .

2 . The battery separator of claim 1 , wherein the fiber web further comprises coarse glass fibers, and wherein the coarse glass fibers have an average diameter of greater than or equal to 1.6 microns.

3 . The battery separator of claim 2 , wherein the coarse glass fibers comprise microglass fibers.

4 . The battery separator of claim 2 , wherein the fiber web comprises greater than 0 wt % and less than or equal to 80 wt % coarse glass fibers.

5 . The battery separator of claim 1 , wherein the fiber web further comprises strengthening fibers.

6 . The battery separator of claim 5 , wherein the strengthening fibers comprise synthetic fibers.

7 . The battery separator of claim 6 , wherein the strengthening fibers comprise bicomponent fibers.

8 . The battery separator of claim 5 , wherein the fiber web comprises greater than 0 wt % and less than or equal to 40 wt % strengthening fibers.

9 . The battery separator of claim 5 , wherein the strengthening fibers comprise chopped strand glass fibers.

10 . The battery separator of claim 9 , wherein the fiber web comprises greater than 0 wt % and less than or equal to 40 wt % of the chopped strand glass fibers.

11 . The battery separator of claim 1 , wherein the fine glass fibers comprise microglass fibers.

12 . The battery separator of claim 1 , wherein the fine glass fibers have an average aspect ratio of greater than or equal to 10.

13 . The battery separator of claim 1 , wherein the fine glass fibers have an average BET specific surface area of less than or equal to 5.0 m 2 /g.

14 . The battery separator of claim 1 , wherein the fiber web comprises greater than or equal to 5 wt % and less than or equal to 100 wt % fine glass fibers.

15 . The battery separator of claim 1 , wherein the fine glass fibers have an average diameter of greater than or equal to 0.3 microns and less than 1.6 microns.

16 . The battery separator of claim 1 , wherein the fine glass fibers have an average length of greater than or equal to 0.01 mm and less than or equal to 0.3 mm.

17 . The battery separator of claim 1 , wherein the fiber web has a tensile strength in the machine direction of greater than or equal to 0.3 lbs/inch and less than or equal to 20 lbs/inch.

18 . The battery separator of claim 1 , wherein the fiber web has a BET specific surface area of greater than or equal to 0.5 m 2 /g and less than or equal to 4 m 2 /g.

19 . A pasting paper for use in a battery, comprising:

a fiber web comprising fine glass fibers;

wherein the fine glass fibers have an average diameter of less than 1.6 microns, an average aspect ratio of less than or equal to 80 and an average BET specific surface area of greater than or equal to 1.6 m 2 /g; and

wherein the pasting paper has a thickness of greater than or equal to 0.1 mm and less than or equal to 0.5 mm.

20 . The pasting paper of claim 19 , wherein the fiber web further comprises coarse glass fibers, and wherein the coarse glass fibers have an average diameter of greater than or equal to 1.6 microns.

21 . The pasting paper of claim 19 , wherein the fiber web further comprises strengthening fibers.

22 . The pasting paper of claim 21 , wherein the strengthening fibers comprise chopped strand glass fibers.

23 . The pasting paper of claim 22 , wherein the fiber web comprises greater than 0 wt % and less than or equal to 40 wt % of the chopped strand glass fibers.

24 . The pasting paper of claim 22 , wherein the chopped strand glass fibers have an average diameter of greater than or equal to 3 microns and less than or equal to 30 microns.

25 . The pasting paper of claim 22 , wherein the chopped strand glass fibers have an average length of greater than or equal to 2 mm and less than or equal to 50 mm.

26 . The pasting paper of claim 19 , wherein the pasting paper has a basis weight of greater than or equal to 5 g/m 2 and less than or equal to 100 g/m 2 .

27 . The pasting paper of claim 19 , wherein the pasting paper has an electrical resistance of greater than or equal to 5 milliΩ·cm 2 and less than or equal to 100 milliΩ·cm 2 .

28 . The pasting paper of claim 19 , wherein the pasting paper has an air permeability of greater than or equal to 2 CFM and less than or equal to 1300 CFM.

29 . A plurality of glass fibers comprising fine glass fibers having an average diameter of less than 1.6 microns, an average aspect ratio of less than or equal to 80, and an average BET specific surface area of greater than or equal to 1.6 m 2 /g.

30 . The plurality of glass fibers of claim 29 , wherein the fine glass fibers comprise microglass fibers.

31 . The plurality of glass fibers of claim 29 , wherein the fine glass fibers are produced by a flame blowing process and/or a rotary spinning process.

32 . The plurality of glass fibers of claim 29 , wherein the fine glass fibers have an average aspect ratio of greater than or equal to 10 and less than or equal to 80.

33 . The plurality of glass fibers of claim 29 , wherein the fine glass fibers have an average BET specific surface area of greater than or equal to 1.6 m 2 /g and less than or equal to 5.0 m 2 /g.

34 . The plurality of glass fibers of claim 29 , wherein the fine glass fibers have an average diameter of greater than or equal to 0.3 microns and less than 1.6 microns.

35 . The plurality of glass fibers of claim 29 , wherein the fine glass fibers have an average length of greater than or equal to 0.01 mm and less than or equal to 0.3 mm.

Assignments (2)
SECURITY INTEREST Recorded Jan 5, 2026
From: HOLLINGSWORTH & VOSE COMPANY
To: BANK OF AMERICA, N.A., AS COLLATERAL AGENT
Reel/Frame 073361/0046 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Dec 28, 2023
From: CLEMENT, NICOLAS; KARWA, AMOGH N.; WERTZ, JOHN A.; HERRINGTON, JOHN J., III; SHARAZI, ASIF MASIH
To: HOLLINGSWORTH & VOSE COMPANY
Reel/Frame 066142/0139 →
Continuity (1)
Related Publication 20240405366A1 · Dec 5, 2024
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