W. L. Gore & Associates, Inc.

Other

Jeffery B Bowman

James D Lewis

Daniel E Hubis

Richard A Staley

Stephen C Newman

Porous polytetrafluoroethylene materials having high strength and coarse microstructure are produced by densifying the materials after removal of lubricant and then stretching. The term, 'coarse,' is used to indicate that the nodes are larger, the fibrils are longer, and the effective pore size is larger than conventional materials of the same matrix tensile strength. Densification can be achieved through the use of such devices as a densification die, a calender machine, or a press. This invention can be used to produce all kinds of shaped articles.

High strength porous polytetrafluoroethylene product having a coarse

Process for producing a high strength porous polytetrafluoroethylene

A porous polytetrafluoroethylene (PTFE) article which is made up of a number of smaller articles with a microstructure of nodes interconnected by fibrils, these articles having been joined to one another such that their microstructure is virtually unaltered across the join. A process for producing such a PTFE article by closely abutting small-shaped PTFE segments and applying a force perpendicular to the seam while heating to a temperature above the crystalline melt point of the segments.

Composite polytetrafluoroethylene article and a process for making the

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Flagstaff, AZ, United States of America

Jeffery B Bowman