High melting point perfluorinated tetrafluoroethylene polymers dissolved in supercritical carbon dioxide at elevated temperatures and high pressures. The solutions are useful for making foams, spun-bonded or paper-like webs, or for purification of polymers....http://www.google.com.au/patents/US5530049?utm_source=gb-gplus-sharePatent US5530049 - Solutions of perfluorinated polymers in CO.sub.2
