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US 8,757,395 B2Granted
Porous PTFE materials and articles produced therefrom
AssigneeW. L. Gore & Associates, Inc.
InventorsJohn E. Bacino, Alex R. Hobson, Jason J. Strid
Life of this patent
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Abstract
Novel porous PTFE membranes are described possessing a unique combination of high strength, low flow resistance, and small pore size. Additionally, unique constructions with superior filtration and venting properties incorporating porous PTFE membranes are described.
Claims27
An article comprising:
- an expanded polytetrafluoroethylene (ePTFE) membrane having a Gurley versus bubble point equal to or below the line defined by the equation log(Gurley)=2.6×10−3(Bubble Point)−0.59, said ePTFE membrane having a surface area of at least 20 m2/g,
- wherein the bubble point of said ePTFE membrane is greater than or equal to the intersection of the line defined by the equation log(Gurley)=2.6×10−3(Bubble Point)−0.59 and the line defined by the equation log(Gurley) 5.13×10−3(Bubble Point))−1.58, and
- wherein the bubble point of said ePTFE membrane is less than or equal to about 877 kPa.
An article comprising:
- an expanded polytetrafluoroethylene (ePTFE) membrane having a Gurley versus bubble point equal to or below the line defined by the equation log(Gurley)=2.6×10−3(Bubble Point)−0.59 and a product of matrix tensile strengths in two orthogonal directions of at least 1.3×105 MPa2, said ePTFE membrane having a first side and a second side,
- wherein the bubble point of said ePTFE membrane is greater than or equal to the intersection of the line defined by the equation log(Gurley)=2.6×10−3(Bubble Point)−0.59 and the line defined by the equation log(Gurley) 5.13×10−3(Bubble Point))−1.58, and
- wherein the bubble point of said ePTFE membrane is less than or equal to about 877 kPa.
An article comprising:
- an expanded polytetrafluoroethylene (ePTFE) membrane having a Gurley versus bubble point equal to or below the line defined by the equation log(Gurley)=2.6×10−3(Bubble Point)−0.59 and a light transmission of at least 50%,
- wherein the bubble point of said ePTFE membrane is greater than or equal to the intersection of the line defined by the equation log(Gurley)=2.6×10−3(Bubble Point)−0.59 and the line defined by the equation log(Gurley) 5.13×10−3(Bubble Point))−1.58, and
- wherein the bubble point of said ePTFE membrane is less than or equal to about 877 kPa.
An article comprising:
- an expanded polytetrafluoroethylene (ePTFE) membrane having a Gurley versus bubble point equal to or below the line defined by the equation log(Gurley)=2.6×10−3(Bubble Point)−0.59, said ePTFE membrane having a first side and a second side,
- wherein the bubble point of said ePTFE membrane is greater than or equal to the intersection of the line defined by the equation log(Gurley)=2.6×10−3(Bubble Point)−0.59 and the line defined by the equation log(Gurley) 5.13×10−3(Bubble Point))−1.58,
- wherein the bubble point of said ePTFE membrane is less than or equal to about 877 kPa,
- wherein said ePTFE membrane has a surface area of at least 20 m2/g,
- wherein said ePTFE membrane a light transmission of at least 50%, and
- wherein a product of matrix tensile strengths in two orthogonal directions of at least 1.3×105 MPa2.
3 more elements
Dependencies are inferred from the claim text.