Porous PTFE Materials and Articles Produced Therefrom
First Claim
Patent Images
1. An article comprising an expanded PTFE membrane having a Gurley versus bubble point equal to or below the line defined by the equation log(Gurley)=5.13×
- 10−
3(Bubble Point)−
1.26 and a PTFE membrane surface area of at least 20 m2/g.
1 Assignment
0 Petitions
Accused Products
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.
47 Citations
32 Claims
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1. An article comprising an expanded PTFE membrane having a Gurley versus bubble point equal to or below the line defined by the equation log(Gurley)=5.13×
- 10−
3(Bubble Point)−
1.26 and a PTFE membrane surface area of at least 20 m2/g. - View Dependent Claims (2, 3, 4)
- 10−
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5. An article comprising an expanded PTFE membrane having a Gurley versus bubble point equal to or below the line defined by the equation log(Gurley)=5.13×
- 10−
3(Bubble Point)−
1.26 and a product of matrix tensile strengths in two orthogonal directions of at least 1.3×
105 MPa2. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13)
- 10−
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14. An article comprising an expanded PTFE membrane having a Gurley versus bubble point equal to or below the line defined by the equation log(Gurley)=5.13×
- 10−
3(Bubble Point)−
1.26 and a light transmission of at least 50%. - View Dependent Claims (15, 16, 17, 18)
- 10−
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19. A porous PTFE membrane having a product of matrix tensile strengths in two orthogonal directions of at least 1.3×
- 105 MPa2.
- 20. An article comprising a porous PTFE membrane having a surface area of at least 20 m2/g.
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23. A porous PTFE membrane having a product of matrix tensile strengths in two orthogonal directions of at least 1.3×
- 105 MPa2.
- View Dependent Claims (24)
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25. An article comprising a composite of at least one porous PTFE membrane and at least one additional layer, said composite further being instantly wettable with water, said composite having a water flux rate versus bubble point equal to or greater than the line defined by the equation log(Water Flux Rate)=−
- 0.01(Bubble Point)+1.3
- View Dependent Claims (26)
- 27. An article comprising at least one porous PTFE membrane having an oil rating of at least 2, said article having a water entry pressure above 500 kPa and a Gurley number up to 350 seconds.
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30. A method of filtering a fluid comprising:
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providing a filter comprising a porous PTFE membrane having a water flux rate versus bubble point equal to or above the line defined by the equation log(Water Flux Rate)=−
3.5×
10−
3(Bubble Point)+1.3; andflowing a fluid containing particle through said filter; thereby filtering said particles from said fluid.
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31. A method of filtering a fluid comprising:
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providing a filter comprising a composite of at least one porous PTFE membrane and at least one additional layer, said composite having a water flux rate versus bubble point equal to or above the line defined by the equation log(Water Flux Rate)=−
3.5×
10−
3(Bubble Point)+1.3; andflowing a fluid containing particle through said filter; thereby filtering said particles from said fluid.
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32. A method of filtering a fluid comprising:
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providing a filter comprising a porous PTFE membrane instantly wettable with water, said membrane having a water flux rate versus bubble point equal to or above the line defined by the equation log(Water Flux Rate)=−
0.01(Bubble Point)+1.3; andflowing a fluid containing particle through said filter; thereby filtering said particles from said fluid.
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Specification