Abstract: This invention relates to a process for preparing perfluoroalkoxysulphonic compounds having formula: ##STR1## wherein R.sub.f represents a perfluoroalkyl or perfluoroethereal group, X represents F, OH or OM, in which M is an alkaline cation, an alkaline-earth cation, or X represents NR.sub.1 R.sub.2, in which R.sub.1 and R.sub.2, independently of each other, represent H or an alkyl group containing from 1 to 5 carbon atoms and p is a number selected from 1 to 2, characterized in that the perfluoro vinyl sulphonyl fluoride of formula (II) CF.sub.2 =CF--SO.sub.2 F is reacted with a hypofluorite of formula (III):R.sub.f (OF).sub.r (III)wherein R.sub.f is the same as defined above, and r represents 1 or 2, optionally in an inert solvent, at a temperature approximately ranging from -140.degree. C. to +40.degree. C.

Abstract: Peroxy perfluoropolyoxyalkylenes are prepared with high yields by carrying out the photo-oxidation of tetrafluoroethylene with molecular oxygen, by means of ultraviolet radiations, operating in the presence of pentafluorochloroethane as a solvent for tetrafluoroethylene.Thus, it is possible to obtain peroxy perfluoropolyoxyalkylenes having a viscosity at 20.degree. C. ranging from 300,000 to 8,000,000 cSt and endowed with a peroxide content not higher than 4.Such perfluoropolyoxyalkylenes provide, through chemical reduction, perfluoropolyoxyalkylenes endowed with a functionality higher than 1.9 and at the same time with a high molecular weight.

Abstract: This invention relates to a process for preparing perfluoroalkoxysulphonic compounds having formula: ##STR1## wherein R.sub.f represents a perfluoroalkyl or perfluoroethereal group, X represents F, OH or OM, in which M is an alkaline cation, an alkaline-earth cation, or X represents NR.sub.1 R.sub.2, in which R.sub.1 and R.sub.2, independently of each other, represent H or an alkyl group containing from 1 to 5 carbon atoms and p is a number selected from 1 to 2, characterized in that the perfluoro vinyl sulphonyl fluoride of formula (II) CF.sub.2 =CF--SO.sub.2 F is reacted with a hypofluorite of formula (III):R.sub.f (OF).sub.r (III)wherein R.sub.f is the same as defined above, and r represents 1 or 2, optionally in an inert solvent, at a temperature approximately ranging from -140.degree. C. to +40.degree. C.

Abstract: The invention relates to new peroxide perfluoropolyethers having formula: ##STR1## wherein: A and B are end groups,X represents a (R'O).sub.m R" group where R' is selected from the class consisting of ##STR2## and R" is a perfluoroalkyl group; the value of "m" ranging from 0 to 6. The invention relates also to processes for preparing said perfluoropolyethers and other classes of non peroxide perfluoropolyethers derived therefrom.

Abstract: The invention relates to new peroxide perfluoropolyethers having formula: ##STR1## wherein: A and B are end groups,X represents a (R'O).sub.m R" group where R' is selected from the class consisting of --CF.sub.2 --, --CF.sub.2 --CF.sub.2 -- and ##STR2## and R" is a perfluoroalkyl group; the value of "m" ranging from 0 to 6. The invention relates also to processes for preparing said perfluoropolyethers and other classes of non peroxide perfluoropolyethers derived therefrom.

Abstract: The invention relates to new peroxide perfluoropolyethers having formula: ##STR1## wherein: A and B are end groups,X represents a (R'O).sub.m R" group where R' is selected from the class consisting of ##STR2## and R" is a perfluoroalkyl group; the value of "m" ranging from 0 to 6. The invention relates also to processes for preparing said perfluoropolyethers and other classes of non peroxide perfluoropolyethers derived therefrom.