Air filter for removing particulate matter and volatile organic compounds
The present invention relates to an air filter for removing contaminants from air. Such a filter is useful in removing particulate matter, as well as volatile organic compounds (VOC's). In particular, the air filter of the present invention includes a reticulated foam substrate having a gel applied thereto. The substrate may be used alone or in combination with an electrostatic filter, which helps to trap smaller particles (i.e., less than 3 microns in diameter). The substrate itself may trap larger particles (i.e., greater than 3 microns in diameter).
1 . An air filter for removing contaminants from air, comprising a substrate having a gel applied thereto, wherein the substrate comprises a reticulated foam.
2 . An air filter for removing contaminants from air, comprising:
(a) an electrostatic filter; and
(b) a substrate having one side disposed in contact with the electrostatic filter, wherein the substrate has a gel applied thereto.
3 . The air filter of claim 1 , wherein the reticulated foam is either polyester or polyurethane.
4 . The air filter of claims 1 or 2 , wherein the gel comprises a polyacrylamide polymer.
5 . The air filter of claim 4 , wherein the polyacrylamide is a homopolymer, and the gel comprises 90% of the polyacrylamide homopolymer and 10% copolymer.
6 . The air filter of claim 5 , wherein the copolymer comprises a monomer having anti-microbial activity.
7 . The air filter of claims 1 or 2 , wherein the gel further comprises sequestrant.
8 . The air filter of claim 7 , wherein the sequestrant is an ion-exchange resin in the acid form.
9 . The air filter of claim 1 , further comprising an electrostatic filter disposed in contact with one side of the substrate.
10 . The air filter of claims 1 or 2 , further comprising a post-filter disposed in contact with the side of the substrate opposite the electrostatic filter.
11 . The air filter of claims 1 or 2 , wherein the substrate further includes a surfactant for adhering the gel to the substrate.
12 . A method of removing contaminants from air, comprising filtering air through an air filter including a substrate comprising a reticulated foam having a gel applied thereto.
13 . A method of removing contaminants from air, comprising filtering air through an air filter including a substrate and an electrostatic filter disposed in contact with one side of the substrate, such that air flow is directed serially to the electrostatic filter first and then through the substrate.
14 . The method of claims 12 or 13 , wherein the filtering step comprises removing volatile organic compounds from the air.
15 . The method of claim 11 , wherein the filtering step comprises removing particulates from the air.
16 . An air filter for removing contaminants from the air, comprising:
(a) a tackified, perforated medium; and
(b) a sequestrant disposed on the tackified medium.
17 . The air filter of claim 16 , wherein the tackified medium comprises a tape.
18 . The air filter of claim 16 , wherein the sequestrant comprises a plurality of beads disposed on one side of the tackified medium.
19 . The air filter of claim 18 , wherein the beads comprise an ion exchange medium.
20 . The air filter of claim 18 , further including a substrate disposed on the other side of the tackified medium.
21 . The air filter of claim 16 , wherein the tackified medium comprises a plurality of sheets of paper, disposed about a cylinderin pin-wheel like manner to form lamellae.
22 . The air filter of claim 16 , wherein the sequestrant is disposed on both sides of the paper.