The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 09, 2017
Filed:
Dec. 19, 2014
W. L. Gore & Associates, Inc., Newark, DE (US);
W. L. Gore & Associates Gmbh, Putzbrunn, DE;
Lawrence A. Ford, München, DE;
Michael E. Kennedy, Oxford, PA (US);
Shaofeng Ran, Kennett Square, PA (US);
Todd S. Sayler, Bear, DE (US);
Gregory J. Shafer, Oxford, PA (US);
W. L. Gore & Associates, Inc., Newark, DE (US);
W. L. Gore & Associates GmbH, Putzbrunn, DE;
Abstract
A dense article that includes a dense TFE copolymer film is provided. The dense TFE copolymer film includes a first endotherm between about 50° C. and about 300° C., a second endotherm between about 320° C. and about 350° C., and a third endotherm between about 350° C. and about 400° C. To form the dense article, a core shell TFE copolymer is formed into a pellet, ram extruded into a tape, dried into a dried preform, and then stretched into a dense TFE copolymer film that exhibits improved physical and mechanical properties. The dense TFE copolymer film is produced directly from the dried preform at a deformation temperature less than about 335° C. and without increasing the porosity of the dried preform, as would conventionally be done in expansion processes. The dense TFE copolymer films have a methane permeability less than about 20 μg*micron/cm/min. The dense articles have a void volume less than about 20%.