FILTER MEDIA COMPRISING ADSORPTIVE PARTICLES
Filter media comprising adsorptive particles are generally described. In some embodiments, the adsorptive particles are present in a relatively large amount, in a layer discrete from one or more other layers and/or fiber webs also present in the filter media, and/or in a layer that comprises a relatively low amount of fibers. In some embodiments, the filter media further comprises a non-woven fiber web comprising fibers with relatively small diameters.
1 . A filter media, comprising:
a first non-woven fiber web, wherein the first non-woven fiber web comprises fibers having an average fiber diameter of less than or equal to 1 micron; and
a layer comprising adsorptive particles, wherein the layer comprising adsorptive particles is discrete from the first non-woven fiber web.
2 . A filter media, comprising:
a first non-woven fiber web, wherein the first non-woven fiber web comprises fibers having an average fiber diameter of less than or equal to 1 micron; and
a layer comprising adsorptive particles, wherein fibers make up less than or equal to 20 wt % of the layer comprising adsorptive particles.
3 . A filter media, comprising:
a first non-woven fiber web, wherein the first non-woven fiber web comprises fibers having an average fiber diameter of less than or equal to 1 micron; and
a layer comprising adsorptive particles in an amount such that the adsorptive particles have a basis weight of greater than or equal to 90 g/m 2 and less than or equal to 1000 g/m 2 .
4 - 6 . (canceled)
7 . The filter media of claim 1 , wherein the adsorptive particles are configured to remove a species from air by adsorption.
8 . (canceled)
9 . The filter media of claim 7 , wherein the species comprises a volatile organic compound, an acidic gas, a basic gas, an aldehyde, and/or benzene.
10 . The filter media of claim 7 , wherein the species comprises SO 2 , NO x , toluene, n butane, H 2 S, and/or ammonia.
11 - 12 . (canceled)
13 . The filter media of claim 1 , wherein the adsorptive particles comprise activated carbon.
14 . The filter media of claim 13 , wherein the activated carbon is surface treated.
15 - 25 . (canceled)
26 . The filter media of claim 1 , wherein the layer comprising adsorptive particles further comprises a binder.
27 . The filter media of claim 26 , wherein the binder comprises an adhesive.
28 . The filter media of claim 26 , wherein the binder comprises bicomponent fibers.
29 - 33 . (canceled)
34 . The filter media of claim 1 , wherein the first non-woven fiber web is surface-modified to have an oleophobic coating, a hydrophobic coating, and/or a fluorinated coating.
35 - 36 . (canceled)
37 . The filter media of claim 1 , wherein the first non-woven fiber web is charged.
38 . (canceled)
39 . The filter media of claim 1 , wherein the filter media comprises a second non-woven fiber web.
40 . The filter media of claim 39 , wherein the second non-woven fiber web is a meltblown fiber web, a spunbond fiber web, a carded fiber web, or a wetlaid fiber web.
41 - 42 . (canceled)
43 . The filter media of claim 39 , wherein the second non-woven fiber web comprises acrylic and poly(propylene) fibers.
44 - 62 . (canceled)
63 . The filter media of claim 39 , wherein the second non-woven fiber web comprises is an electret charge.
64 . (canceled)
65 . The filter media of claim 39 , wherein the second non-woven fiber web is a charged, meltblown non-woven fiber web.
66 - 84 . (canceled)
85 . The filter media of claim 39 , wherein the second non-woven fiber web comprises staple fibers.
86 . The filter media of claim 39 , wherein the second non-woven fiber web comprises two types of fibers having different dielectric constants.