Copolymerizable fluorinated compounds, a process for their preparation and thermoplastic fluoropolymers obtainable therefrom

A 2-allyl-perfluoroalkyl-trifluorovinyl ether of the formula (I) wherein R1F and R2F represent either -CF3 or, together, (CF2)n where n=2 or 3, is produced by a) reacting hexafluoropropene oxide with a 2-allyl-substituted perfluorocycloketone or perfluoroketone, b) subjecting the resulting 2-(allylperfluorocycloalkoxy)- or 2-(allylperfluyoro-alkoxy)-perfluoropropanoic acid fluoride to alkaline saponification thereby to form the corresponding sodium salt, c) and decarboxylating the sodium salt at about 150 DEG -350 DEG C. Polymers thereof produce amorphous, transparent coatings or molded items with glass transition temperatures between 60 DEG and 150 DEG C. and have good solubility characteristics in a number of organic solvents. A 2-allyl-perfluoroalkyl-trifluorovinyl ether of the formula (I) wherein R1F and R2F represent either -CF3 or, together, (CF2)n where n=2 or 3, is produced by a) reacting hexafluoropropene oxide with a 2-allyl-substituted perfluorocycloketone or perfluoroketone, b) subjecting the resulting 2-(allylperfluorocycloalkoxy)- or 2-(allylperfluyoro-alkoxy)-perfluoropropanoic acid fluoride to alkaline saponification thereby to form the corresponding sodium salt, c) and decarboxylating the sodium salt at about 150 DEG -350 DEG C. Polymers thereof produce amorphous, transparent coatings or molded items with glass transition temperatures between 60 DEG and 150 DEG C. and have good solubility characteristics in a number of organic solvents.