Polymer blend, polymer solution composition and fibers spun from the polymer blend and filtration applications thereof
AssigneeDonaldson Company, Inc.
InventorVeli Kalayci
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Abstract
The invention relates to a web or filter structure such as the filtration media comprising a collection of fiber comprising a first polymer and a second polymer in a fine fiber or fine fiber web structure. The combination of two polymers provides improved fiber rheology in that the fiber has excellent temperature and mechanical stability. The combination of polymers imparts the properties of elasticity or tackiness, which is desirable for adhering particles to the fiber web, with high temperature resistance.
Claims58
A fine fiber comprising and a first polymer comprising a polyurethane and a second polymer, wherein there is about 0.1 to 0.99 parts of the second polymer per part of the first polymer, wherein the fiber has a diameter of about 0.001 to 5 microns and the first polymer and the second polymer are miscible.
A fine fiber comprising a polyamide polymer and a polyurethane polymer, wherein there is about 0.1 to 0.99 parts of a polyamide polymer per part of the polyurethane polymer, wherein the fiber has a diameter of about 0.001 to 5 microns and the polyamide and the polyurethane are miscible.
The fiber of 30 wherein the particle is an activated carbon.
A method of forming a fine fiber layer comprising the steps of
- (a) forming a solution of a first polymer comprising a polyurethane and a second polymer;
- (b) electrospinning the solution onto a substrate to form a fine fiber layer;
- and
- (c) drying the layer sufficiently to remove substantially all the solvent from the layer.
Dependencies are inferred from the claim text.