Patent ID: 7005545

Claim:
A process for producing a fluorinated fluorosulfonylalkyl vinyl ether represented by general formula (2): CF 2 ═CFO(CF 2 CF(CF 3 )O) n CF 2 CF 2 SO 2 F (2) wherein n is an integer from 0 to 10, comprising fluorinating a perfluorovinylether sulfonate with SF 4 and HF, the perfluorovinylether sulfonate being represented by general formula (1): CF 2 ═CFO(CF 2 CF(CF 3 )O) n CF 2 CF 2 SO 3 M (1) wherein M is Ma or Mb 1/2 , provided that Ma is an alkali metal and Mb is an alkaline earth metal; and n is as defined above.