Dense polytetrafluoroethylene articles
AssigneeW. L. Gore & Associates, Inc.
InventorsJohn B. Knox, William E. Delaney, III, John M. Connelly, Jr.
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Abstract
This invention provides a densified previously expanded PTFE article having remnants of a fibril and node structure and a process for producing the article. A PTFE shape is compressed through the application of heat and pressure while the shape itself is under a vacuum, thus forming the densified ePTFE article. The densified PTFE article exhibits increased flexural strength. A diaphragm containing the densified ePTFE article as one layer is also disclosed.
Claims4
A material consisting essentially of a sintered, densified expanded polytetrafluoroethylene having remnants of a fibril and node structure as characterized by peaks at about 327.degree. C. and about 380.degree. C. in a thermogram of differential scanning calorimetry in the course of temperature rise of 10.degree. C./min, having a density of 2.10 gm/cc or greater and being substantially free of pores.
Dependencies are inferred from the claim text.