Patent · US Expired

Preparation of perfluorinated vinyl ethers having a sulfonyl fluoride end-group

US6624328B1 · kind B1 · utility

110Cited by
37References
17Claims
0Family size

Assignee

Inventor

Key dates

Filing dateDec 17, 2002
Grant dateSep 23, 2003
Priority date—
Expiry dateDec 17, 2022

Classification

  • Technology area (CPC C)Chemistry; Metallurgy
  • CPC primaryC25B3/28
  • WIPO fieldOrganic fine chemistry
  • WIPO sectorChemistry

Abstract

A method is provided for making a perfluorinated vinyl ether having a sulfonyl fluoride end-group according to the formula FSO2—(CF2)n—O—CF═CF2, where n is 2-5, comprising the steps of: a) fluorination of: to produce FSO2—(CF2)(n−1)—COF; b) reaction of FSO2—(CF2)(n−1)—COF with hexafluoropropylene oxide (HFPO) to produce FSO2—(CF2)(n)—O—CF(CF3)—COF; c) reaction of FSO2—(CF2)(n)—O—CF(CF3)—COF with a salt of a metal cation M+P, where p is the valence of M, to produce (FSO2—(CF2)(n)—O—CF(CF3)—COO−)pM+P; and d) thermal cracking of FSO2—(CF2)(n)—O—CF(CF3)—COO−)pM+P to produce FSO2—(CF2)(n)—O—CF═CF2.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.