Methods for the production of fluoropolymer fibers

Patent metadata

Field	Value
Publication number	US-10087554-B2
Application number	US-201214004049-A
Country	US
Kind code	B2
Filing date	Mar 9, 2012
Priority date	Mar 9, 2011
Publication date	Oct 2, 2018
Grant date	Oct 2, 2018

Abstract

A method of producing fibers, includes placing a composition that includes one or more fluoropolymers in the body of a fiber producing device and rotating the device at a speed sufficient to eject material from the fiber producing device to form fluoropolymer microfibers and/or nanofibers.

First claim

What is claimed is:

1. A method of producing fibers, comprising:
mixing one or more fluoropolymers with a solvent to produce a composition comprising a solution of the one or more fluoropolymers in the solvent;
placing the composition comprising one or more fluoropolymers into a fiber producing device, the fiber producing device comprising a body comprising a concave cavity and one or more openings in communication with the concave cavity, wherein the composition is placed into the concave cavity of the body;
rotating the fiber producing device at a speed of at least about 500 rpm, wherein rotation of the fiber producing device causes the composition in the concave cavity of the body of the fiber producing device to be passed from the concave cavity of the body through one or more of the openings to produce microfibers and/or nanofibers comprising one or more of the fluoropolymers; and
collecting at least a portion of the produced microfibers and/or nanofibers;
wherein the microfibers and/or nanofibers are created without subjecting the fibers, during their creation, to an externally applied electric field.

2. The method of claim 1 , wherein the fiber producing device comprises at least two opposing openings.

3. The method of claim 1 , wherein the fiber producing device comprises one or more needles coupled to one or more of the openings.

4. The method of claim 1 , further comprising coupling the fiber producing device to a driver, and activating the driver, wherein the driver rotates the fiber producing device.

5. The method of claim 1 , further comprising placing the fiber producing device in a chamber, and controlling the environment inside the chamber.

6. The method of claim 1 , further comprising collecting fibers on a collection device surrounding at least a portion of the fiber producing device.

7. The method of claim 6 , wherein an intermediate wall at least partially surrounds the collection device, and wherein the intermediate wall has a greater height than the collection device.

8. The method of claim 1 , further comprising collecting fibers on one or more collection rods surrounding at least a portion of the fiber producing device.

9. The method of claim 1 , wherein one or more of the fluoropolymers comprise a polytetrafluoroethylene polymer.

10. The method of claim 1 , wherein one or more of the fluoropolymers are dissolved in a fluorinated solvent.

11. The method of claim 1 , wherein the fibers are produced at room temperature.

12. The method of claim 1 , wherein the composition consists essentially of one or more fluoropolymers in a solvent.

13. The method of claim 1 , wherein the composition consists of one or more fluoropolymers in a solvent.

14. The method of claim 1 , where the solvent used to form the solution is a fluorinated solvent.

15. The method of claim 1 , wherein the fiber producing device comprises a plurality of syringe couplings coupled to one or more of the openings in the body, and a plurality of needles removably coupled to the syringe couplings, wherein rotation of the fiber producing device causes the composition in the fiber producing device to be passed through the plurality of needles to produce microfibers and/or nanofibers comprising one or more of the fluoropolymers.

Assignees

• Lozano Karen
• Rane Yatinkumar
• Bell Nelson
• Univ Texas

Inventors

• Lozano Karen
• Rane Yatinkumar
• Bell Nelson

Classifications

• B29C41/045

  the axis being placed vertically, e.g. spin casting · CPC title

• D01D5/18 Primary

  by means of rotating spinnerets · CPC title

• D01F6/12

  from polymers of fluorinated hydrocarbons · CPC title

• C08F14/185

  Monomers containing fluorine not covered by the groups C08F14/20 - C08F14/28 · CPC title

• Y10T428/249921

  Web or sheet containing structurally defined element or component · CPC title