IP Library › Granted Patent US 12,434,180
Granted Patent B2
US 12,434,180 · App. 18/379,478 · Granted Oct 7, 2025

Nonwoven filtration media including microfibrillated cellulose fibers

Inventors: Janelle M. Hampton (Burnsville, MN); Derek Owen Jones (Andover, MN); Suresh Laxman Shenoy (Bloomington, MN)
Assignee: Donaldson Company, Inc.
B01D39/1607B01D39/1615B01D39/1623B01D39/18B01D39/2017D04H1/425D04H1/43828D04H1/43835D04H1/43838B01D2239/064B01D2239/1233
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Quick Facts
Patent No.
US 12,434,180
App. No.
18/379,478
Granted
Oct 7, 2025
Kind
B2
Abstract

A nonwoven filtration medium that includes a fibrous base media including synthetic and/or natural fibers and microfibrillated cellulose fibers.

Claims (22)

1. A nonwoven filtration medium comprising:

a fibrous base media comprising polyester fibers and bicomponent fibers; and

a layer comprising microfibrillated cellulose fibers disposed on a surface of the fibrous base media, wherein a majority of the microfibrillated cellulose fibers have a lateral dimension of up to 4 microns.

2. The nonwoven filtration medium of claim 1 , wherein the microfibrillated cellulose fibers have a lateral dimension of 700 nm to 4 microns.

3. The nonwoven filtration medium of claim 1 , wherein the microfibrillated cellulose fibers are used in an amount effective to increase the strength and/or filtration efficiency of the base media compared to the base media without the microfibrillated cellulose fibers.

4. The nonwoven filtration medium of claim 1 , wherein the microfibrillated cellulose fibers are present in an amount of 1 wt-% to 49 wt-% based on the total weight of the nonwoven filtration medium.

5. The nonwoven filtration medium of claim 1 , wherein the base media comprises electrospun fibers.

6. The nonwoven filtration medium of claim 1 wherein the polyester fibers have an average lateral dimension of up to 15 microns.

7. The nonwoven filtration medium of claim 1 , wherein the base media comprises fibers having an average lateral dimension of at least 0.5 microns.

8. The nonwoven filtration medium of claim 1 wherein the base media comprises at least 10 wt-% fiberglass fiber.

9. The nonwoven filtration medium of claim 1 , wherein the base media comprises fiberglass fibers.

10. The nonwoven filtration medium of claim 1 , wherein the nonwoven filtration medium has a strength that is greater than that of the base media without the microfibrillated cellulose fibers.

11. The nonwoven filtration medium of claim 1 which possesses an average filtration efficiency that is at least 5% greater than that of the base media without the microfibrillated cellulose fibers, according to the LEFS Test.

12. The nonwoven filtration medium of claim 1 suitable for air or liquid filtration.

13. The nonwoven filtration medium of claim 1 , wherein the nonwoven filtration medium does not comprise resin.

14. The nonwoven filtration medium of claim 1 , wherein the bicomponent fibers comprise sheath-core bicomponent fibers.

15. The nonwoven filtration medium of claim 14 , wherein the sheath-core bicomponent fibers comprise a sheath is formed of a first material and a core formed of a second material, and wherein the first material has a lower melting point than the second material.

16. The nonwoven filtration medium of claim 15 , wherein the bicomponent fibers comprise a polyolefin sheath and a polyester core.

17. The nonwoven filtration medium of claim 1 , wherein the bicomponent fibers are held together without an additional resin in addition to resins present in the fibers.

18. A filter element comprising a nonwoven filtration medium of claim 1 .

19. The filter element of claim 18 , wherein the filter element is a flat-panel filter.

20. The filter element of claim 18 wherein the filter element is a cartridge filter.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Apr 24, 2024
From: HAMPTON, JANELLE M.; JONES, DEREK OWEN; SHENOY, SURESH LAXMAN
To: DONALDSON COMPANY, INC.
Reel/Frame 067207/0334 →
Continuity (5)
Continuation 17132146 · Dec 23, 2020
Continuation 16541911 · Aug 15, 2019
Continuation 14773977
Provisional Application 61775536 · Mar 9, 2013
Related Publication 20240109011A1 · Apr 4, 2024
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