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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 (DE)
KENNEDY MICHAEL E (US)
RAN SHAOFENG (US)
SAYLER TODD S (US)
SHAFER GREGORY J (US)
Application Number:
US2015/063609
Publication Date:
January 12, 2017
Filing Date:
December 03, 2015
Export Citation:
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Assignee:
GORE & ASS (US)
GORE W L & ASS GMBH (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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