Green fabrication of polytetrafluoroethylene and expanded polytetrafluoroethylene and uses thereof
AssigneeWisconsin Alumni Research Foundation
InventorsLih-Sheng Turng, Yiyang Xu, Yu-Jyun Lin, Dong-Fang Wang
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Abstract
Green, fast and easy evaporating organic solvent for use as a lubricant in the processing of polytetrafluoroethylene (PTFE) and expanded polytetrafluoroethylene (ePTFE) products and processes of using the solvents to fabricate the products are disclosed herein. The products can be used in the field of bio- and medical applications, such as for use in 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.
Claims15
A method of preparing an extruded product, the method comprising:
- dissolving a target additive into an organic solvent to form a target-solvent solution;
- immersing a polytetrafluoroethylene (PTFE) powder in the target-solvent solution to form a blend, wherein the organic solvent is present in the blend in an amount of from about 10% by weight to about 30% by weight;
- preforming the blend;
- extruding the preformed blend to form a product;
- and
- evaporating the target-solvent solution from the extruded product.
A method for preparing an extruded product, the method comprising:
- dissolving a target additive into an organic solvent to form a target-solvent solution, wherein the target additive is present in the target-solvent solution in an amount of from about 0.1% by weight to about 5% by weight;
- immersing a sintered extruded polytetrafluoroethylene (PTFE) product in the target-solvent solution to form a wetted PTFE product;
- and
- evaporating the target-solvent solution from the extruded product.
Dependencies are inferred from the claim text.