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1. (WO2017001457) MILIEU FILTRANT ET PROCÉDÉS DE PRODUCTION CORRESPONDANTS
Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

CLAIMS

1 . A filter medium comprising : a splittable multicomponent fiber, wherein at least a portion of the splittable multicomponent fiber is present in the filter medium in split form as at least a first split component having a diameter of less than or equal to about 2 μπι and a second split component having a diameter of about 1 μπι to about 5 μΓη; and a monocomponent fiber having a diameter of greater than or equal to about 5 μιτι.

2. The filter medium of claim 1 , wherein the splittable multicomponent fiber has a configuration selected from the group consisting of side-by-side, islands-in-the-sea, segmented pie, segmented cross and tipped multi-lobal.

3. The filter medium of claim 1 , wherein the splittable multicomponent fiber is a bicomponent fiber.

4. The filter medium of claim 1 , wherein the splittable multicomponent fiber has a length of less than or equal to about 3 inches.

5. The filter medium of claim 1 , wherein the splittable multicomponent fiber is present in the filter medium in amount of about 1 0-90 wt%.

6. The filter medium of claim 1 , wherein the monocomponent fiber is present in the filter medium in amount of about 10-90 wt%.

7. The filter medium of claim 1 , wherein the first split component is present in a weight ratio of about 1 0-90% of the splittable multicomponent fiber.

8. The filter medium of claim 1 , wherein the second split component is present in a weight ratio of about 10-90% of the splittable multicomponent fiber.

9. The filter medium of claim 1 , wherein the first split component has a diameter of less than or equal to about 1 μιτι.

10. The filter medium of claim 1 , wherein the first split component and the second split component comprise a material independently selected from the group consisting of a polymeric material, a ceramic material, titania, glass, alumina and silica.

11 .The filter medium of claim 1 , wherein the first split component and the second split component comprise a polymeric material selected from the group consisting of a polyolefin , a polyester, a polyamide, a polyacrylate, and a vinyl polymer.

12. The filter medium of claim 1 , wherein the first split component comprises nylon.

13. The filter medium of claim 1 , wherein the second split component comprises polyester.

14. The filter medium of claim 1 , wherein the monocomponent fiber comprises a material selected from the group consisting of a polymeric material, a ceramic material, titania, glass, alumina and silica.

15. The filter medium of claim 1 , wherein the monocomponent fiber comprises polyester.

16. The filter medium of claim 1 , wherein the monocomponent fiber has length of less than or equal to about 3 inches.

17. The filter medium of claim 1 , wherein the filter medium has a weight basis of about 50 gsm to about 300 gsm.

18. The filter medium of claim 1 , wherein the splittable multicomponent fiber has a split ratio of at least about 10%.

19. The filter medium of claim 1 , wherein the splittable multicomponent fiber is responsive to mechanical splitting.

20. The filter medium of claim 1 , wherein the splittable multicomponent fiber and the monocomponent fiber are present as a mixture.

21 .A method of preparing the filter medium of claim 1 comprising : blending the splittable multicomponent fiber with the monocomponent fiber; and mechanically splitting the splittable multicomponent fiber into the first split component and the second split component.

22. The method of claim 21 , wherein mechanically splitting the splittable multicomponent fiber comprises hydroentangling, needlepunching and/or carding.

23. The method of claim 21 , wherein blending the splittable multicomponent fiber with the monocomponent fiber comprises carding, air-laying and/or wet-laying.

24. The method of claim 21 , further comprising bonding the multicomponent fiber with the monocomponent fiber.

25. The method of claim 24, wherein bonding the multicomponent fiber with the monocomponent fiber comprises needlepunching and/or hydroentangling.

26. The method of claim 21 , further comprising adding a binder fiber and/or resin.

27. A nonwoven material blend comprising : a splittable multicomponent fiber capable of splitting with a mechanical force into at least a first split component having a diameter of less than or equal to about 2 μπι and a second split component having a diameter of about 1 μπι to about 5 μπι ; and a monocomponent fiber having a diameter of greater than or equal to about 5 μπι.