Oligohexafluoropropylene oxide derivatives represented by the general formula (I): ##STR1## wherein R.sub.f represents a perfluoroalkyl group having 1 to 10 carbon atoms and n is an integer of 0 to 100 or the general formula (II): ##STR2## wherein R.sub.f ' represents a perfluoroalkylene group having...http://www.google.de/patents/US5278340?utm_source=gb-gplus-sharePatent US5278340 - Oligohexafluoropropylene oxide derivative and process of producing the same
