Method for synthesizing perfluorinated ether compounds via polyesters
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United States of America Patent
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Jul 21, 1992
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N/A
app pub date -
Jan 16, 1991
filing date -
Mar 31, 1982
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Expired
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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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