# US 2023/0056539 A1 · Articles comprising binders, cross-linking agents and/or other components, and related methods > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2023/0056539 A1 - Document ID: US20230056539A1 - Status: Published application - Kind: A1 - Application number: 17/394,983 - Filed: 2021-08-05 - Published: 2023-02-23 - Earliest claimed: 2021-08-05 - Assignees: Hollingsworth & Vose Company - Applicants: Hollingsworth & Vose Company - Inventors: Douglas M. Guimond; Mark Snyder - Web page: https://patentgrep.com/patent/US20230056539A1 ## CPC - B01D 39/1615: {of natural origin} - B01D 39/10: Filter screens essentially made of metal - B01D 39/1623: {of synthetic origin} - B01D 39/163: {sintered or bonded} - B01D 39/18: the material being cellulose or derivatives thereof ({cork or peat B01D39/1646} ; making filter paper D21F11/14) - B01D 39/2024: {otherwise bonded, e.g. by resins} - B01D 2239/04: Additives and treatments of the filtering material - B01D 2239/0464: Impregnants - B01D 2239/064: The fibres being mixed - B01D 2239/065: More than one layer present in the filtering material - B01D 2239/069: Special geometry of layers - B01D 2239/083: Binders between layers of the filter - B01D 2239/086: Binders between particles or fibres - B01D 2239/10: Filtering material manufacturing - B01D 2239/1216: Pore size - B01D 2239/1258: Permeability - B01D 2239/1291: Other parameters - B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28) ## Abstract Articles comprising binders, cross-linking agents and/or other components, and related methods are generally disclosed. ## Claims ### Claim 1 An article, comprising: cotton fibers; a cross-linking agent; a binder resin; and an additive. ### Claim at position 2 2-19. (canceled) ### Claim 20 A filter medium, comprising: a first phase comprising a first plurality of fibers and a second plurality of fibers different from the first plurality of fibers; a second phase comprising a third plurality of fibers and a fourth plurality of fibers different from the third plurality of fibers, the third plurality of fibers being the same as or different from the first or second plurality of fibers and the fourth plurality of fibers being the same as or different from the first or second plurality of fibers; and a transition phase between the first and second phases, wherein the transition phase comprises at least a portion of the first plurality of fibers, at least a portion of the second plurality of fibers, at least a portion of the third plurality of fibers, and at least a portion of the fourth plurality of fibers, and wherein at least a portion of the first plurality of fibers, at least a portion of the second plurality of fibers, at least a portion of the third plurality of fibers, and at least a portion of the fourth plurality of fibers are intermingled with each other; wherein the air permeability of the first plurality of fibers is higher than the air permeability of the second plurality of fibers, and the air permeability of the third plurality of fibers is higher than the air permeability of the fourth plurality of fibers; wherein a weight ratio of the first plurality of fibers to the second plurality of fibers is from 50:50 to 97:3; wherein the first and second phases form a wet laid structure; wherein the first, second, third, and fourth pluralities of fibers are wet laid; wherein the basis weight ratio of the first phase to the second phase is from 30:70 to 70:30; wherein the filter medium has a dust holding capacity from 1 g to 3 g measured according to a Palas flat sheet test; and wherein the filter medium has a mean flow pore size of at least 25 microns and at most 1000 microns. ### Claim 21 A filter medium, comprising: a first phase comprising a first plurality of fibers and a second plurality of fibers different from the first plurality of fibers; a second phase comprising a third plurality of fibers and a fourth plurality of fibers different from the third plurality of fibers, the third plurality of fibers being the same as or different from the first or second plurality of fibers and the fourth plurality of fibers being the same as or different from the first or second plurality of fibers; and a transition phase between the first and second phases, wherein the transition phase comprises at least a portion of the first plurality of fibers, at least a portion of the second plurality of fibers, at least a portion of the third plurality of fibers, and at least a portion of the fourth plurality of fibers, and wherein at least a portion of the first plurality of fibers, at least a portion of the second plurality of fibers, at least a portion of the third plurality of fibers, and at least a portion of the fourth plurality of fibers are intermingled with each other; wherein the air permeability of the first plurality of fibers is higher than the air permeability of the second plurality of fibers, and the air permeability of the third plurality of fibers is higher than the air permeability of the fourth plurality of fibers; wherein a weight ratio of the first plurality of fibers to the second plurality of fibers is from 50:50 to 97:3; wherein the first and second phases form a wet laid structure; wherein the first, second, third, and fourth pluralities of fibers are wet laid; wherein the basis weight ratio of the first phase to the second phase is from 30:70 to 70:30; and wherein the filter medium has a dust holding capacity from 1 g to 3 g measured according to a Palas flat sheet test. ### Claim 22 (depends on 20) The filter medium of claim 20, wherein the air permeability of the second or fourth plurality of fibers is from 5 CFM to 50 CFM. ### Claim 23 (depends on 20) The filter medium of claim 20, wherein the air permeability of the second plurality of fibers is from 15 CFM to 25 CFM. ### Claim 24 (depends on 20) The filter medium of claim 20, wherein the air permeability of the first or third plurality of fibers is from 50 CFM to 350 CFM. ### Claim 25 (depends on 20) The filter medium of claim 20, wherein the air permeability of the first or third plurality of fibers is from 100 CFM to 200 CFM. ### Claim 26 (depends on 20) The filter medium of claim 20, wherein the filter medium comprises a binder. ### Claim 27 (depends on 26) The filter medium of claim 26, wherein the binder is at most 35% of the basis weight of the filter medium. ### Claim 28 (depends on 26) The filter medium of claim 26, wherein the binder is at most 25% of the basis weight of the filter medium. ### Claim 29 (depends on 27) The filter medium of claim 27, wherein the binder comprises a material selected from the group consisting of polyvinyl acetate, an epoxy, a polyester, a polyvinyl alcohol, and/or an acrylic. ### Claim 30 (depends on 20) The filter medium of claim 20, wherein each of the first, second, third, and fourth fibers are formed of an organic polymeric material. ### Claim 31 (depends on 20) The filter medium of claim 20, wherein the filter medium has an air permeability of 2 CFM to 200 CFM. ### Claim 32 (depends on 20) The filter medium of claim 20, wherein the weight ratio of first to second phase is from 40:60 to 60:40. ### Claim 33 (depends on 20) The filter medium of claim 20, wherein the first phase comprises a mixture of softwood fibers and hardwood fibers. ### Claim 34 (depends on 20) The filter medium of claim 20, wherein the first or third plurality of fibers have an average fiber length from 1.5 mm to 6 mm. ### Claim 35 (depends on 20) The filter medium of claim 20, wherein the second or fourth plurality of fibers have an average fiber length of from 0.5 mm to 2 mm. ### Claim 36 (depends on 20) The filter medium of claim 20, wherein at least two of the first, second, third and fourth pluralities of fibers are either hardwood or softwood fibers. ### Claim 37 (depends on 20) The filter medium of claim 20, wherein the filter medium includes a weight ratio of the first and second pluralities of fibers of from 50:50 to 90:10, and a weight ratio of the third and fourth pluralities of fibers of from 10:90 to 50:50. ### Claim 38 (depends on 20) The filter medium of claim 20, wherein the filter medium has a mean flow pore size of from 25 microns to 125 microns.