Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acids and salts thereof
Patent
1991-01-16
1992-07-21
Evans, J. E.
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acids and salts thereof
560180, 568677, 568683, C07C 5109, C07C 5502, C07C 6700, C07C 6963
Patent
active
051324555
ABSTRACT:
This invention relates to perfluoroether compounds, and to a general method for creating such compounds. It has been found that such compounds may be created by a three-step method which may be performed using a wide variety of ester starting materials. The first step of the three-step process comprises partial fluorination of a selected polyester compound. This may be performed by contacting the selected polyester with fluorine gas under predetermined conditions until a desired level of partial fluorination is achieved.
The second step of this three-step process involves indirect fluorination to convert the partially fluorinated polyester into partially fluorinated polyether compounds. This step may be conducted by contacting the partially fluorinated polyester with SF.sub.4.
The third step of the three-step synethetic process comprises direct fluorination of the partially fluorinated polyether compound at conditions which essentially complete the perfluorinated polyether compound.
By careful selection of the polyester starting compound, this invention provides a general, widely-applicable method of creating perfluoropolyether compounds with selected repeating units and moieties.
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Gerhardt, G., "The Synthesis of Fluorocarbon Monomers and Polymers by Direct Fluorination", Massachusetts Institute of Technology Doctoral Thesis, Jun. 1978.
Persico et al., "Synthesis of Perfluoropolyethers via Hydrocarbon Polyesters: A New General Method", J. Amer. Chem. Soc., 107:1197-1201 (1985).
Persico, D. F. and R. J. Lagow, J. Polymer Sci. 29:233-242 (1991).
Persico, D. F., "New Directions in Elemental Fluorine Chemistry: Novel Fluorocarbons and Perfluoropolymers for Specialized Applications", Doctoral Thesis, Univ. Of Texas at Austin, Chapter VI, May, 1985.
Evans J. E.
Exfluor Research Corporation
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