Porous PTFE materials and articles produced therefrom
First Claim
Patent Images
1. An article comprising a porous 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 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.
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Citations
87 Claims
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1. An article comprising a porous 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 surface area of at least 20 m2/g. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- 10−
- 10. An article comprising a porous PTFE membrane having a light transmission of at least 50% and a porosity of at least 50%.
- 13. An article comprising a porous PTFE membrane having a surface area of at least 20 m2/g.
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16. An article comprising a porous PTFE membrane having a bubble point of at least 448 kPa and a Gurley versus bubble point equal to or below the line defined by the equation log (Gurley)=2.60×
- 10−
3 (Bubble Point)−
0.54. - View Dependent Claims (17, 18, 19)
- 10−
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20. 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 (21, 22, 23)
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24. An article comprising a porous 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 (25, 26, 27, 28, 29)
- 10−
- 30. An article comprising a porous PTFE membrane having a water entry pressure versus Gurley number equal to or above the line defined by the equation WEP=3(Gurley)+2500
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37. An article 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. - View Dependent Claims (38, 39, 40)
- 3.5×
- 41. An article comprising a porous PTFE membrane having a water flux rate versus mean flow pore size equal to or above the line defined by the equation log (water flux rate)=16.9 (mean flow pore size)−
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45. An article 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. - View Dependent Claims (46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56)
- 3.5×
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57. 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 (58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68)
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69. An article 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
- View Dependent Claims (70, 71, 72)
- 73. 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 1250 kPa and a Gurley number up to 200 seconds.
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76. (canceled)
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79. An article comprising a porous 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)−
1.22 and a light transmission of at least 50%. - View Dependent Claims (80, 81, 82)
- 10−
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83. 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; and
flowing a fluid containing particle through said filter;
thereby filtering said particles from said fluid.
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84. 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 mean flow pore size equal to or above the line defined by the equation log (water flux rate)=16.9 (mean flow pore size)−
1.85; and
flowing a fluid containing contaminants through said filter;
thereby filtering said particles from said fluid.
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85. 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; and
flowing a fluid containing particle through said filter;
thereby filtering said particles from said fluid. - View Dependent Claims (87)
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86. 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; and
flowing a fluid containing particle through said filter;
thereby filtering said particles from said fluid.
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Specification