Perfluoroalkyl sulfide sulfone polysulfone and polysulfide diols

A bis-perfluoroalkyldiol of the formula I ##STR11## wherein R.sub.1 is a direct bond, a linear or branched alkylene of up to 6 carbon atoms, alkyleneoxyalkylene of up to 6 carbon atoms, alkylenethioalkylene of up to 6 carbon atoms, alkyleneoxy of up to 6 carbon atoms, alkenyleneoxyalkylene of up to 6 carbon atoms, alkylenethioalkyleneoxyalkylene of up to 9 carbon atoms, carbonamidoalkylene where the alkylene moiety contains up to 6 carbon atoms and the amido nitrogen is unsubstituted or further substituted by lower alkyl, sulfonamidoalklyene wherein the alkylene moiety contains up to 6 carbon atoms and the amido nitrogen is unsubstituted or further substituted by lower alkyl;

• carbonamidoalkylenethioalkylene wherein the carbonamidoalkylene moiety is as defined hereinabove and the thioalkylene moiety contains up to 6 carbon atoms, or sulfonamidoalkylenethioalkylene wherein the sulfonamidoalkylene moiety is as defined hereinabove and the thioalkylene moiety contains up to 6 carbon atoms,
• R.sub.x, R.sub.y and R.sub.z are independently of each other hydrogen or an alkyl group with 1-5 carbon atoms,
• h is 1 or2,
• g is 0, 1, or 2, with the proviso that when h is 2, g is 0,
• d is 0 or 1,
• D is an alkylene group with 2 to 10 carbon atoms, a dialkylene ether group with 4 to 10 carbon atoms, or pentaerythritol diacetate or dipropionate, and R.sub.F is a monovalent, perfluorinated, alkyl or alkenyl, linear, branched or cyclic organic radical having 3 to 20 fully fluorinated carbon atoms, and each R.sub.F radical is the same or different, with the proviso that when R.sub.1 is --CH.sub.2 --, h is 1 and g and d are 0, R.sub.x is methyl or each R.sub.F group is linear.