Methods of making polytetrafluoroethylene/polymer composites and uses thereof

Patent metadata

Field	Value
Publication number	US-12173125-B2
Application number	US-202016744497-A
Country	US
Kind code	B2
Filing date	Jan 16, 2020
Priority date	Jan 16, 2020
Publication date	Dec 24, 2024
Grant date	Dec 24, 2024

Abstract

Methods of making polytetrafluoroethylene (PTFE)/polymer composites are disclosed herein. The products can be used in the field of bio- and medical applications, such as for use in artificial blood vessels, vascular grafts, cardiovascular and soft tissue patches, facial implants, surgical sutures, and endovascular prosthesis, and for any products known in the aerospace, electronics, fabrics, filtration, industrial and sealant arts.

First claim

What is claimed is:

1. A process for preparing a polytetrafluoroethylene (PTFE)/polymer composite product, the process comprising: dissolving a polymer with a solvent to form a polymer solution; immersing a PTFE material into the polymer solution to uniformly coat the PTFE material with the polymer solution; evaporating the solvent from the PTFE/polymer solution by heating the PTFE/polymer solution to a temperature of from 60° C. to about 200° C. for a period of from about 0.5 minutes to about 120 minutes to form a PTFE/polymer blend; adding a lubricant to the PTFE/polymer blend; and extruding the PTFE/polymer blend.

2. The process as set forth in claim 1 , wherein the solvent is a biocompatible lower alkyl (C 1 -C 10 ) alcohol selected from the group consisting of methanol, ethanol, isopropanol, and combinations thereof.

3. The process as set forth in claim 1 , wherein the solvent is selected from the group consisting of acetic acid, ethyl acetate, acetonitrile, chloroform, benzene, methylbenzene, dimethylbenzene, acetone, 2-butanone, cyclopentanone, pentane, n-hexane, cyclohexane, heptane, dichloromethane, dichloroethane, trichloroethane, tetrachloromethane, tetrachloroethane, trimethylpentane, 1,4-dioxane, ether, dimethyl sulfoxide (DMSO), dimethylformamide (DMF), tetrahydrofuran (THF), and combinations thereof.

4. The process as set forth in claim 1 , wherein the polymer is selected from the group consisting of polylactic acid (PLA), polycaprolactone (PCL), thermoplastic polyurethane (TPU), polyvinyl alcohol (PVA), poly(ethylene oxide) (PEO), polycarbonate (PC), polystyrene (PS), polyamide (PA), polyacrylonitrile (PAN), and combinations thereof.

5. The process as set forth in claim 1 , wherein the lubricant is the same as the solvent.

6. The process as set forth in claim 1 , wherein the solvent is further mixed with water before dissolving the polymer and the solvent/water mixture has a weight ratio of 70:30.

7. The process as set forth in claim 1 , wherein immersing the PTFE material comprises roll blending the PTFE material and the polymer solution for a period of from about 30 minutes to about 120 minutes.

8. The process as set forth in claim 7 further comprising soaking the blend for a period of from about 30 minutes to about 48 hours after rolling.

9. The process as set forth in claim 1 further comprising preforming the PTFE/polymer blend and extruding the preformed blend to form an extruded composite product.

10. The process as set forth in claim 9 comprising preforming the PTFE/polymer blend at a pressure of from about 1 MPa to about 30 MPa.

11. The process as set forth in claim 1 further comprising expanding the extruded product.

12. The process as set forth in claim 11 , wherein the expanding is conducted at a temperature of from about 25° C. to about 340° C.

13. The process as set forth in claim 11 , wherein the extruded product is expanded at a rate of from about 1 mm/min to about 1000 mm/min.

14. The process as set forth in claim 11 , wherein the extruded product is expanded at an expansion ratio of from about 100% to about 800%.

15. The process as set forth in claim 1 further comprising dissolving a target material in the polymer solution.

Assignees

• Wisconsin Alumni Res Found

Inventors

• Turng Lih-Sheng
• Xu Yiyang
• Wang Dongfang

Classifications

• B29C48/023

  Extruding materials comprising incompatible ingredients · CPC title

• C08J2201/0462

  using organic solvents · CPC title

• C08J9/26

  by elimination of a solid phase from a macromolecular composition or article, e.g. leaching out · CPC title

• C08J2207/10

  Medical applications, e.g. biocompatible scaffolds · CPC title

• C08J2201/046

  Elimination of a polymeric phase · CPC title