Preparation of perfluorinated vinyl ethers having a sulfonyl fluoride end-group
Assignee3M Innovative Properties Company
InventorMiguel Antonio Guerra
Life of this patent
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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.
Claims17
A method of 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.
Dependencies are inferred from the claim text.