发明名称 |
Dense Articles Formed From Tetrafluoroethylene Core Shell Copolymers and Methods of Making The Same |
摘要 |
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/cm2/min. The dense articles have a void volume less than about 20%. |
申请公布号 |
US2016177001(A1) |
申请公布日期 |
2016.06.23 |
申请号 |
US201414577597 |
申请日期 |
2014.12.19 |
申请人 |
W. L. Gore & Associates, Inc. ;W. L. Gore & Associates GmbH |
发明人 |
Ford Lawrence A.;Kennedy Michael E.;Ran Shaofeng;Sayler Todd S.;Shafer Gregory J. |
分类号 |
C08F214/26;C08J9/00;B29C55/02;B32B27/08;B32B15/085;B29C55/00;C09D127/18;B32B27/32 |
主分类号 |
C08F214/26 |
代理机构 |
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代理人 |
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主权项 |
1. A dense article comprising:
a dense TFE copolymer film having 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. |
地址 |
Newark DE US |