Polymer, polymer microfiber, polymer nanofiber and applications including filter structures
AssigneeDonaldson Company, Inc.
InventorsHoo Y. Chung, John R. B. Hall, Mark A. Gogins, Douglas G. Crofoot, Thomas M. Weik
Life of this patent
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Abstract
Disclosed are improved polymer materials. Also disclosed are fine fiber materials that can be made from the improved polymeric materials in the form of microfiber and nanofiber structures. The microfiber and nanofiber structures can be used in a variety of useful applications including the formation of filter materials.
Claims69
A filter media comprising a fine fiber layer having a basis weight of 0.0001 to 24 gm/m2 and a melt blown substrate, the fine fiber comprising a polymer comprising the reaction product of a polyvinyl alcohol and a crosslinking agent, the fiber having a fiber size of about 0.01 to 0.5 micron, the substrate comprising a filtration medium;
- wherein after exposure to air at 140° F. and 100% relative humidity for 1 to 16 hours at least 50% of the fine fiber remains substantially unchanged.
A filter media comprising a fine fiber layer having a fiber size of about 0.01 to 0.5 micron and a basis weight of 0.0001 to 24 gm/m2 and a filtration substrate having a basis weight of about 8 to 200 grams/meter2, the fine fiber comprising a polymer selected from the group consisting of:
- (a) a blend of a hydrophobic additive and a nylon 66, the fine fiber having a fiber size of about 0.01 to 0.5 micron;
- (b) a blend of a hydrophobic additive and a polymer comprising a blend of at least two different nylon polymers, the fine fiber having a fiber size of about 0.01 to 0.5 micron;
- (c) a blend of a hydrophobic additive and a nylon polymer comprising a nylon other than a copolymner formed from a cyclic lactam and a C6-10 diamine monomer or a C6-10 diacid monomer, the fine fiber having a fiber size of about 0.01 to 0.5 micron;
- or
- (d) mixtures thereof;
- wherein after exposure to air at 140° F. and 100% relative humidity for 1 to 16 hours at least 50% of the fine fiber remains substantially unchanged;
- the substrate comprising a filtration medium.
A filter media comprising a fine fiber layer having a fiber size of about 0.01 to 0.5 micron and a basis weight of 0.0001 to 24 gm/m2 and a filtration substrate having a basis weight of about 8 to 200 grams/meter2, the fine fiber comprising the reaction product of a polymer resin and a cross linking agent;
- wherein after exposure to air at 140° F. and 100% relative humidity for 1 to 16 hours at least 50% of the fine fiber remains substantially unchanged.
A filter media comprising a fine fiber layer having a fiber size of about 0.01 to 0.5 micron and a basis weight of 0.0001 to 24 gm/m2 and a filtration substrate having a basis weight of about 8 to 200 grams/meter2, the fine fiber comprising an electrospun fiber comprising the reaction product of a polymer resin and a crosslinking agent;
- wherein after exposure to air at 140° F. and 100% relative humidity for I to 16 hours at least 50% of the fine fiber remains substantially unchanged.
A filter media comprising a fine fiber layer having a fiber size of about 0.01 to 2 micron end a basis weight of 0.0001 to 24 gm/m2, the layer having a thickness of about 1 to 100 times the fiber diameter, and a non-woven filtration substrate, the fine fiber layer comprising the reaction product of a polyurethane polymer and a crosslinking agent;
- wherein the fiber, when exposed to an air stream having a temperature of about 140° F. and a relative humidity of about 100%, greater than about 50% of the fiber survives for more than 1–16 hours.
A filter media comprising a fine fiber layer having a fiber size of about 0.01 to 2 microns and a basis weight of 0.0001 to 24 gm/m2, the layer having a thickness of about 1 to 100 times the fiber diameter, and a non-woven substrate, the fine fiber layer comprising a polyurethane polymer and a resinous additive comprising an oligomer having a molecular weight of about 500 to 3000 and an aromatic character;
- wherein the additive miscible in the polymer and wherein the fiber, when exposed to an air stream having a temperature of about 140° F. and a relative humidity of about 100%, greater than about 50% of the fiber survives for more than 1–16 hours.
A filter media comprising a fine fiber layer having a fiber size of about 0.01 to 2 micron and a basis weight of 0.0001 to 24 gm/m2, the layer having a thickness of about 1 to 100 times the fiber diameter, and a non-woven filtration substrate, the fine fiber layer comprising the reaction product of an addition polymer and a crosslinking agent;
- wherein the fiber, whcn exposed to an air stream having a temperature of about 140° F. and a relative humidity of about 100%, greater than about 50% of the fiber survives for more than 1–16 hours.
A fiber media comprising a fine fiber layer having a fiber size of about 0.01 to 2 micron and a basis weight of 0.0001 to 24 gm/m2, the layer having a thickness of about 1 to 100 times the fiber diameter and a non-woven filtration substrate, the fine fiber layer the reaction product of a condensation polymer and a crosslinking agent;
- wherein the fiber, when exposed to an air stream having a temperature of about 140° F. and a relative humidity of about 100%, greater than about 50% of the fiber survives for more than 1–16 hours.
Dependencies are inferred from the claim text.