Stock material or miscellaneous articles – Hollow or container type article – Polymer or resin containing
Patent
1993-12-01
1995-08-01
Cannon, James C.
Stock material or miscellaneous articles
Hollow or container type article
Polymer or resin containing
43 4498, 55527, 55528, 55529, 55DIG5, 128DIG14, 174110FC, 20415761, 20415763, 20419211, 20419236, 21050024, 210508, 2105101, 427534, 427551, 427554, 427569, 428 364, 428 369, 428 3692, 428224, 4283084, 4283115, 428376, 428398, 428409, 428422, 600 36, 606231, 623 1, 623 8, 623 11, 623 12, 623 66, 623901, 216 67, 216 58, A01K 9100, A61F 201, A61F 204, A61F 206, A61F 252, A61L 2700, B01D 3916, B32B 3300
Patent
active
054379008
ABSTRACT:
Porous expanded polytetrafluoroethylene material having a microstructure of nodes interconnected by fibrils wherein a surface of the material has been modified to have increased hydrophobicity as indicated by having a water droplet roll-off angle of less than about 10 degrees in comparison to a typical roll-off angle of greater than about 12 degrees for the unmodified material. Under magnification, the surface morphology may be indistinguishable from that of the unmodified precursor material. The modification is preferably done by exposing the surface to radio frequency gas plasma discharge with a reactive etching gas for a lengthy amount of time such as about ten minutes. If surface etching is continued beyond a time adequate to produce the highly hydrophobic behavior, then the surface morphology includes the appearance of broken fibrils. Still further treatment results in complete removal of fibrils from the surface so that under magnification the surface has the appearance of freestanding node portions not interconnected by fibrils but rather having open valleys disposed between the freestanding node portions.
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Cannon James C.
House Wayne D.
W. L. Gore & Associates, Inc.
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