Cartridge filter and method of making same
AssigneeAMF Incorporated
InventorsMichael Kilty, Allan Pernigotti
Life of this patent
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Abstract
Cartridge filters of enhanced capture potential for fine contaminants, prepared by selective interaction of melamine formaldehyde bonding resin and polyamido/polyamine-epichlorhydrin charge modifier.
Claims18
A cartridge filter comprising an integral at least semi-rigid self-supporting porous thick-walled tubular element consisting essentially of fibrous material bonded with a melamine-formaldehyde resin, the surfaces of the bonded fibrous material being modified with a polyamido/polyamine-epichlorhydrin cationic resin.
A method for the treatment of bonded cartridge filters comprising impregnating a dry preformed at least semi-rigid self-supporting thick-walled tubular filter element comprising fibrous material bonded into an integral porous structure with a melamine-formaldehyde resin with an aqueous solution of a polyamido/polyamine-epichlorhydrin cationic resin to provide a surface coating on the bonded fibrous surfaces sufficient to enhance filtration efficiency, and drying and curing the impregnated structure at a temperature of at least about 300.degree. F.
A method for the preparation of cartridge filters comprising bonding a fibrous structure into an at least semi-rigid self-supporting porous thick-walled tubular element with a melamine-formaldehyde resin, treating the surfaces of the bonded interfelted fibrous structure with a polyamido/polyamine-epichlorhydrin resin, and drying and curing the treated structure at a temperature of at least about 300.degree. F. to remove essentially all water.
Dependencies are inferred from the claim text.