Porous articles having an expanded fluoropolymer and a coherent irregular network are described. In one embodiment, the coherent irregular network is attached to the expanded fluoropolymer at only a portion of the adjacent region. In another aspect of the invention the coherent irregular network is
Porous articles having an expanded fluoropolymer and a coherent irregular network are described. In one embodiment, the coherent irregular network is attached to the expanded fluoropolymer at only a portion of the adjacent region. In another aspect of the invention the coherent irregular network is a free standing film. The coherent irregular network in one embodiment has a surface roughness defined by an Sp value of greater than 35 um.
대표청구항▼
1. A porous article comprising: a porous expanded polytetrafluoroethylene (ePTFE) membrane; anda coherent irregular network comprising particles of at least one thermoplastic fluoropolymer fused together;wherein a surface of said porous ePTFE membrane comprises at least one adjacent region at which
1. A porous article comprising: a porous expanded polytetrafluoroethylene (ePTFE) membrane; anda coherent irregular network comprising particles of at least one thermoplastic fluoropolymer fused together;wherein a surface of said porous ePTFE membrane comprises at least one adjacent region at which said coherent irregular network is attachedwherein the coherent irregular network comprises open areas, andwherein at least one of the open areas is greater than about 100 μm in size. 2. The porous article of claim 1 having a specific resistance of less than about 2400 krayls and greater than about 0.24 krayls. 3. The porous article of claim 1, wherein the coherent irregular network comprises a plurality of voids and is affixed to said porous ePTFE membrane at only a portion of the at least one adjacent region. 4. The porous article of claim 1, wherein the coherent irregular network comprises bridging. 5. The porous article of claim 1, wherein the coherent irregular network is greater than about 5 μm thick. 6. The porous article of claim 1, wherein the coherent irregular network is greater than about 5 μm thick and less than about 500 μm thick. 7. The porous article of claim 1 having a Sp value greater than about 35 μm on at least one surface. 8. The porous article of claim 1, wherein the particles of the at least one thermoplastic fluoropolymer have an MFI between 0.3 g/10 min and 10g/10 min when tested at 372 ° C. and 2.16 kg load. 9. The porous article of claim 1, wherein the particles of the at least one thermoplastic fluoropolymer consist essentially of fluorinated ethylene propylene (FEP). 10. The porous article of claim 9, wherein the FEP has a MFI of less than 1.0 g/10 min when tested at 372° C. and 2.16 kg load. 11. The porous article of claim 1, wherein the coherent irregular network has a BET surface area of at least about 0.35 m2/g. 12. The porous article of claim 1, wherein the coherent irregular network has a BET surface area between about 0.25 m2/g and about 5 m2/g. 13. The porous article of claim 1 having a percent area shrinkage of less than about 20%. 14. The porous article of claim 1, having a percent area shrinkage of less than about 5%. 15. The porous article of claim 1, further comprising a hydrophilic coating and wherein the porous article is hydrophilic. 16. The porous article of claim 1, further comprising an oleophobic coating and wherein the porous article is oleophobic. 17. The porous article of claim 1 in the form of a sheet. 18. The porous article of claim 1, further comprising a support layer. 19. The porous article of claim 18, wherein the support layer is affixed to said coherent irregular network. 20. The porous article of claim 18, wherein the support layer is affixed to said porous ePTFE membrane. 21. The porous article of claim 1, wherein the coherent irregular network further comprises a pattern. 22. The porous article of claim 21, wherein the coherent irregular network is in a linear pattern. 23. The porous article of claim 21, wherein the coherent irregular network is in a discrete pattern. 24. The porous article of claim 21, wherein the coherent irregular network is in a connected pattern. 25. The porous article of claim 1, wherein a ratio of thickness of the porous membrane to the coherent irregular network ranges from about 1:10 to about 1:200. 26. A porous article comprising: a porous expanded polytetrafluoroethyIene (ePTFE) membrane;a first coherent irregular network comprising particles of at least one thermoplastic fluoropolymer fused together, said first coherent irregular network being attached to one side of said porous ePTFE membrane; anda second coherent irregular network comprising particles of at least one thermoplastic fluoropolymer fused together, said second coherent irregular network being attached to said eTPFE membrane on a side opposing said first coherent irregular network;wherein at least one of the first coherent irregular network and second coherent irregular network comprises open areas and,wherein at least one of the open areas is greater than about 100 μm in size. 27. The porous article of claim 26, wherein said first coherent irregular network and said ePTFE membrane have an attached area ratio between about 0.05 to 0.25. 28. The porous article of claim 26, wherein a surface of said porous ePTFE membrane comprises at least one adjacent at which at least one of said first coherent irregular network or said second coherent irregular network is attached. 29. The porous article of claim 26, wherein at least one of said first coherent irregular network and said second coherent irregular network further comprises a thermoplastic polymer. 30. The porous article of claim 26, wherein said second coherent irregular network and said ePTFE membrane have an attached area ratio between about 0.05 to 0.25. 31. A porous article comprising: a porous expanded fluoropolymer membrane: anda coherent irregular network comprising particles of at least one thermoplastic polymer fused together,wherein a surface of said porous expanded fluoropolymer membrane comprises at least one adjacent region at which said coherent irregular network is attached,wherein the coherent irregular network is attached to said expanded fluoropolymer membrane at only a portion of the adjacent region,wherein the coherent irregular network comprises open areas,wherein at least one of the open areas is greater than about 100 μm in size,wherein said at least one thermoplastic polymer is a thermoplastic fluoropolymer, andwherein the particles of the at least one thermoplastic fluoropolymer have an MFI between 0.3 g/10 min and 10g/10 min when tested at 372° C. and 2.16 kg load. 32. The porous article of claim 31, wherein the at least one thermoplastic polymer further comprises a first thermoplastic polymer and a second thermoplastic polymer. 33. The porous article of claim 32, wherein the first thermoplastic polymer and has a lower melting point than the second thermoplastic polymer. 34. The porous article of claim 31, wherein the at least one thermoplastic polymer further comprises a plurality of thermoplastic polymers. 35. The porous article of claim 31, having a specific resistance of less than about 2400 krayls and greater than about 0.24 krayls. 36. The porous article of claim 31, wherein said expanded fluoropolymer membrane is expanded polytetrafluoroethylene (ePTFE). 37. The porous article of claim 31, wherein the coherent irregular network comprises bridging. 38. The porous article of claim 31, wherein the coherent irregular network is greater than about 5μm thick. 39. The porous article of claim 31, wherein the coherent irregular network is greater than about 5 μm thick and less than about 500 μm thick. 40. The porous article of claim 31, having a Sp value greater than about 35 μm on at least one surface. 41. The porous article of claim 31, wherein the particles of the at least one thermoplastic fluoropolymer consist essentially of fluorinated ethylene propylene (FEP). 42. The porous article of claim 41, wherein the FEP has a MFI of less than 1.0 g/10 min when tested at 372° C. and 2.16 kg load. 43. The porous article of claim 31, wherein the coherent irregular network has a BET surface area of at least about 0.35 m2/g. 44. The porous article of claim 31, wherein the coherent irregular network has a BET surface area between about 0.25 m2/g and about 5 m2/g. 45. The porous article of claim 31. having a percent area shrinkage of less than about 20%. 46. The porous article of claim 31, having a percent area shrinkage of less than about 5%. 47. The porous article of claim 31, further comprising a hydrophilic coating and wherein the porous article is hydrophilic. 48. The porous article of claim 31, further comprising an oleophobic coating and wherein the porous article is oleophobic. 49. The porous article of claim 31, further comprising a support layer. 50. The porous article of claim 49, wherein the support layer is affixed to said coherent irregular network. 51. The porous article of claim 49, wherein the support layer is affixed to said porous expanded fluoropolymer membrane. 52. The porous article of claim 31 , wherein said coherent irregular network and said porous expanded fluoropolymer membrane have an attached area ratio between about 0.05 to 0.25. 53. A porous article comprising: a porous expanded fluoropolymer membrane; anda coherent irregular network comprising particles of at least one thermoplastic polymer fused together;wherein a surface of said porous expanded fluoropolymer membrane comprises at least one adjacent region at which said coherent irregular network is attached,wherein the coherent irregular network is attached to said expanded fluoropolymer membrane at only a portion of the adjacent region,wherein said coherent irregular network and said expanded fluoropolymer membrane have an attached area ratio between about 0.05 to 0.25,wherein said coherent irregular network comprises open areas,wherein at least one of the open areas is greater than about 100 μm in size,wherein said at least one thermoplastic polymer is a thermoplastic fluoropolymer, andwherein the particles of the at least one thermoplastic fluoropolymer have an MFI between 0.3 g/10 min and 10g/10 min when tested at 372° C. and 2.16 kg load. 54. The porous article of claim 53, wherein the at least one thermoplastic polymer further comprises a first thermoplastic polymer and a second thermoplastic polymer. 55. The porous article of claim 54, wherein the first thermoplastic polymer and has a lower melting point than the second thermoplastic polymer. 56. The porous article of claim 53, wherein the at least one thermoplastic polymer further comprises a plurality of thermoplastic polymers. 57. The porous article of claim 53, having a specific resistance of less than about 2400 krayls and greater than about 0.24 krayls. 58. The porous article of claim 53, wherein said expanded fluoropolymer membrane is expanded polytetrafluoroethylene (ePTFE). 59. The porous article of claim 53. wherein the coherent irregular network comprises bridging. 60. The porous article of claim 53, wherein the coherent irregular network is greater than about 5 μm thick. 61. The porous article of claim 53, wherein the coherent irregular network is greater than about 5 μm thick and less than about 500 μm thick. 62. The porous article of claim 53, having a Sp value greater than about 35 μm on at least one surface. 63. The porous article of claim 53, wherein the particles of the at least one thermoplastic fluoropolymer consist essentially of fluorinated ethylene propylene (FEP). 64. The porous article of claim 63, wherein the FEP has a MFI of less than 1.0 g/10 min when tested at 372° C. and 2.16 kg load. 65. The porous article of claim 53, wherein the coherent irregular network has a BET surface area of at least about 0.35 m2/g. 66. The porous article of claim 53, wherein the coherent irregular network has a BET surface area between about 0.25 m2/g and about 5 m2/g. 67. The porous article of claim 53, having a percent area shrinkage of less than about 20%. 68. The porous article of claim 53, having a percent area shrinkage of less than about 5%. 69. The porous article of claim 53 further comprising a hydrophilic coating and wherein the porous article is hydrophilic. 70. The porous article of claim 53, further comprising an oleophobic coating and wherein the porous article is oleophobic. 71. The porous article of claim 53, further comprising a support layer. 72. The porous article of claim 71, wherein the support layer is affixed to said coherent irregular network. 73. The porous article of claim 71 , wherein the support layer is affixed to said porous expanded fluoropolymer membrane.
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