Filter medium for deactivating allergens

Patent metadata

Field	Value
Publication number	US-10315146-B2
Application number	US-201615336844-A
Country	US
Kind code	B2
Filing date	Oct 28, 2016
Priority date	Nov 2, 2015
Publication date	Jun 11, 2019
Grant date	Jun 11, 2019

Abstract

Filter medium, comprising at least one acid-functionalized layer, characterized in that the acid-functionalized layer has a first acid with a pks 1 value of 0 to 7 and a C8 to C18 fatty acid as the second acid.

First claim

The invention claimed is:

1. A filter medium, comprising:
an acid-functionalized layer,
wherein the acid-functionalized layer comprises a first acid with a pK a1 value of 0 to 7 and a second acid comprising a C8 to C18 fatty acid.

2. The medium of claim 1 , wherein the first acid comprises a fruit acid.

3. The medium of claim 1 , wherein the second acid comprises a C8 to C16 fatty acid.

4. The medium of claim 1 , wherein the second acid is caprylic acid, pelargonic acid, capric acid, undecanoic acid, lauric acid, tridecanoic acid, myristic acid, pentadecanoic acid, palmitic acid, or a mixture thereof.

5. The medium of claim 1 , wherein a ratio between the first acid and the second acid in the filter medium is in a range of from 10.000:1 to 1:1.

6. The medium of claim 1 , wherein the acid-functionalized layer comprises the first acid in a quantity of 0.1 wt. % to 30 wt. %,
and/or
wherein the acid-functionalized layer comprises the second acid in a quantity of less than 10 wt. %,
in each case based on the total weight of the acid-functionalized layer.

7. The medium of claim 1 , wherein the acid-functionalized layer is an impregnated and/or coated non-woven fabric.

8. The medium of claim 1 , wherein the acid-functionalized layer comprises a surface-active substance as wetting agent, applied before and/or at the same time as an application of the second acid.

9. The medium of claim 1 , wherein the acid-functionalized layer comprises a fungicidal substance, applied before and/or at the same time as the application of the fatty acid.

10. A method of producing a supply air filter for a building, a car interior supply air filter, and/or room air filter, the method comprising contacting the medium of claim 1 with the filter.

11. A filter arrangement, comprising:
A) a particle-filtering region comprising (a1) a particle filter carrier layer, and (a2) a microfiber layer and/or membrane filter layer arranged on the particle filter carrier layer, and, optionally, (a3), a cover layer arranged on a side of the microfiber layer and/or membrane filter layer remote from the particle filter carrier layer; and/or
B) an absorbing region comprising (b1) an adsorption layer, and (b2) an adsorption carrier layer arranged on the adsorption layer ( 2 a ),
wherein at least one of the particle filter carrier layer, microfiber layer, membrane filter layer, cover layer, adsorption layer, and adsorption carrier layer is formed from the medium of claim 1 .

12. The arrangement of claim 11 , wherein the adsorption layer comprises an adsorbent comprising an activated carbon particles, ion exchanger, zeolite, or a mixture of two or more of any of these.

13. The arrangement of claim 11 , wherein the adsorption carrier layer and/or the particle filter layer comprises a non-woven fabric, comprising
spunbonded non-wovens having an average fiber diameter within a range of 20 to 60 μm, and/or
staple fiber non-wovens having an average fiber diameter of 10 to 50 μm, and/or
wherein the microfiber layer and/or the membrane filter layer comprises a non-woven fabric, and/or
wherein the cover layer comprises a non-woven fabric.

14. The medium of claim 1 , configured to filtering gas particles.

15. The medium of claim 1 , wherein the first acid comprises malic acid, fumaric acid, gluconic acid, glycolic acid, mandelic acid, lactic acid, oxalic acid, salicylic acid, α-hydroxycaprylic acid, tartaric acid, citric acid, or a mixture thereof.

16. The medium of claim 1 , wherein the second acid comprises a C16 fatty acid, C12 to C14 fatty acids, C8, C10, C12 fatty acids and mixtures thereof.

17. The medium of claim 1 , wherein the second acid comprises a C12 to C14 fatty acid.

18. The medium of claim 1 , wherein the second acid comprises a C8 fatty acid, C10 fatty acid, C12 fatty acid, or a mixtures of two or more of any of these.

19. The medium of claim 1 , wherein a ratio between the first acid and the second acid in the filter medium is in a range of from 100:1 to 5:1.

Assignees

• Freudenberg Carl Kg

Inventors

• Schacht Heiko
• Haefner Uwe
• Staudenmayer Oliver

Classifications

• B01D46/0036

  by adsorption or absorption · CPC title

• B01D46/521

  using folded, pleated material · CPC title

• B01D46/0028 Primary

  provided with antibacterial or antifungal means · CPC title

• B01D46/0038

  with means for influencing the odor, e.g. deodorizing substances · CPC title

• B01D24/007

  with multiple filtering elements in series connection · CPC title