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US 8,978,899 B2Granted
Fluoropolymer fine fiber
AssigneeDonaldson Company, Inc.
InventorsIsmael Ferrer, Chuanfang Yang
Life of this patent
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Abstract
A layer of fluoropolymer fine fiber can be made. The fine fiber can be made by electrospinning from a solvent or a solvent blend. The layers of the invention are useful in general filtration of fluid streams including gaseous and liquid streams. The fine fiber layers are also useful as hydrophobic filtration layers that can be used to separate water from a hydrocarbon stream.
Claims55
A fine fiber layer comprising a fine fiber, the fine fiber comprising a fluoropolymer comprising;
- a polymer comprising tetrafluoroethylene and hexafluoropropylene;
- a polymer comprising tetrafluoroethylene and a perfluorovinyl ether;
- a polymer comprising hexafluoropropylene, tetrafluoroethylene, and ethylene;
- a polymer comprising vinylidene fluoride, trifluoroethylene, and tetrafluoroethylene;
- or
- a polymer comprising a fluorinated acrylic monomer, wherein the fluorinated acrylic monomer is a fluorinated acrylate or methacrylate;
- the fine fiber comprising a fine fiber diameter of about 0.1 microns to 0.5 microns, the fine fiber layer comprising a thickness of about 0.2 microns to about 30 microns and a basis weight of about 0.01 grams per square meter to less than 10 grams per square meter.
4 more elements
A fine fiber layer, comprising a fine fiber comprising a fluoropolymer comprising;
- a polymer comprising tetrafluoroethylene and hexafluoropropylene;
- a polymer comprising tetrafluoroethylene and a perfluorovinyl ether;
- a polymer comprising hexafluoropropylene, tetrafluoroethylene, and ethylene;
- a polymer comprising vinylidene fluoride, trifluoroethylene, and tetrafluoroethylene;
- or
- a polymer comprising a fluorinated acrylic monomer, wherein the fluorinated acrylic monomer is a fluorinated acrylate or methacrylate;
- the fine fiber comprising a diameter of about 0.1 microns to 0.5 microns, the fine fiber layer comprising a thickness of about 0.3 microns to about 5 microns when the fine fiber layer is viewed at an angle 90° from the angle of fiber deposition, a basis weight of about 0.1 grams per square meter to about 2 grams per square meter, and air permeability of about 0.1 m3/min/m2 to 1.0 m3/min/m2.
4 more elements
Dependencies are inferred from the claim text.