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Patent Searching and Data


Title:
DENSE ARTICLES FORMED FROM TETRAFLUROETHYLENE CORE SHELL COPOLYMERS AND METHODS OF MAKING THE SAME
Document Type and Number:
WIPO Patent Application WO/2016/099914
Kind Code:
A8
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 20μg*micron/cm2/min. The dense articles have a void volume less than about 20%.

Inventors:
FORD, Lawrence, A. (Höchlstr. 3, Munchen, Munchen, DE)
KENNEDY, Michael, E. (109 McBerty Court, Oxford, PA, 19363, US)
RAN, Shaofeng (273 Avonwood Road, Kennett Square, PA, 19348, US)
SAYLER, Todd, S. (604 Aster Court, Bear, DE, 19701, US)
SHAFER, Gregory, J. (210 Wilson Mill Road, Oxford, PA, 19363, US)
Application Number:
US2015/063609
Publication Date:
January 12, 2017
Filing Date:
December 03, 2015
Export Citation:
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Assignee:
W.L. GORE & ASSOCIATES, INC. (555 Paper Mill Road, Newark, DE, 19711, US)
W.L. GORE & ASSOCIATES GMBH (Herrmann-Oberth-Strasse 22, Putzbrunn, Putzbrunn, DE)
International Classes:
C08J5/18; B29C55/00; C08F214/26; C08F259/08; C08L27/18
Attorney, Agent or Firm:
MILLER, Amy et al. (W.L. Gore & Associates, Inc.551 Paper Mill Road,P.O. Box 920, Newark DE, 19714-9206, US)
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