Perfluorinated polymers
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United States of America Patent
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Jul 1, 2008
Grant Date -
May 31, 2007
app pub date -
Dec 19, 2006
filing date -
Apr 15, 2003
priority date (Note) -
Expired
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Abstract
Amorphous perfluorinated homopolymers and copolymers of perfluorodioxoles of formula (IA): ##STR00001## wherein R'.sub.F is equal to R.sub.F or OR.sub.F wherein R.sub.F is a linear or branched perfluoroalkyl radical having 1-5 carbon atoms; X.sub.1 and X.sub.2, equal to or different from each other, are F, CF.sub.3; said polymers having a dioxole content.gtoreq.95% by moles, having the following property combination: Tg, measured according to the ASTM 3418 (DSC) method, from 180.degree. C. to 195.degree. C.; intrinsic viscosity, measured at the temperature of 30.degree. C. in perfluoroheptane (Galden.RTM. D80) according to the ASTM D 2857-87 method, from 13 cc/g to 100 cc/g.
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