US 12,447,427 B2
Filter media, filters, and methods for making the same
Shaune John Hanley, Montreal (CA); Cloé Bouchard-Aubin, Pointe-Claire (CA); Natalie Page, Pointe-Claire (CA); and François Drolet, Pointe-Claire (CA)
Assigned to Resolute FP Canada, Inc., Montreal (CA)
Appl. No. 17/442,723
Filed by Resolute FP Canada, Inc., Montreal (CA)
PCT Filed Mar. 26, 2020, PCT No. PCT/US2020/024876
§ 371(c)(1), (2) Date Sep. 24, 2021,
PCT Pub. No. WO2020/198428, PCT Pub. Date Oct. 1, 2020.
Claims priority of provisional application 62/824,030, filed on Mar. 26, 2019.
Prior Publication US 2022/0161170 A1, May 26, 2022
Int. Cl. B01D 39/00 (2006.01); B01D 39/18 (2006.01)
CPC B01D 39/18 (2013.01) [B01D 2239/0266 (2013.01); B01D 2239/0457 (2013.01); B01D 2239/10 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A filter media consisting of:
a single layer of 50% or greater of a cellulosic pulp fiber, by weight of the filter media, a bonding material, and 3% or greater of a flame-resistant treatment composition, by weight of the filter media, the flame-resistant treatment composition consisting of citric acid, sodium hypophosphite, and combinations thereof;
wherein the filter media has a MERV (ed. 2017) rating of 7 or greater,
wherein the filter media has an initial pressure drop from 0.02 inH2O to 0.45 inH2O at an air flow rate of 110 ft/min, a thickness of 800 μm to 3200 μm, a permeability of 200 cubic ft/min (CFM) to 1000 CFM at 0.5 inH2O, and a density of 0.03 g/cm3 to 0.10 g/cm3,
wherein the filter media has a dust holding capacity of 30 g/sq.ft. to 50 g/sq.ft. measured at an air flow rate of 110 ft/min and a final pressure drop of 1.0 inH2O, and
whereby, when the filter media is converted to a filter, the filter meets the flammability requirements defined by UL 900 (8th ed. 2015).