Direct crosslinking process for preparing perfluoroalkyl-cross-linked fluoropolymer having perfluoroether pendant groups
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United States of America Patent
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Nov 1, 2016
Grant Date -
Sep 3, 2015
app pub date -
Sep 26, 2013
filing date -
Sep 28, 2012
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Abstract
This invention pertains to a novel thermal process for converting a fluoropolymer having cyano-functionalized perfluoroether pendant groups into a novel perfluoroalkyl-crosslinked fluoropolymer having perfluoroether pendant groups. The process comprises heating the fluoropolymer having cyano-functionalized perfluoroether pendant groups in the presence of Cl—F to a temperature in the range of 200 to 300° C. The fluoropolymer having cyano-functionalized perfluoroether pendant groups can first be formed into a shaped article, and the shaped article then subject to treatment in situ with Cl—F.
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