Claims
- 1. A process for preparing a fluorine-containing polyether which comprises the steps of:
- a. reacting perfluoroglutaryl chloride with 1,5-hexafluoropentane diol in the presence of a catalytic amount of dimethylformamide so as to obtain a fluorinated polyester; and
- b. reacting the fluorinated polyester with sulfur tetrafluoride in the presence of hydrogen fluoride, thereby obtaining a fluorine-containing polyether product.
- 2. The process according to claim 1 in which substantially equimolar amounts of perfluoroglutaryl chloride and 1,5-hexafluoropentane diol are reacted in the presence of about 0.5 to 10 milliliters of dimethylformamide per mole of either of the aforementioned reactants at a temperature ranging from about room temperature to 200.degree. C. for a period of about 1 to 24 hours.
- 3. The process according to claim 2 in which the fluorinated polyester is reacted with a molar excess of sulfur tetrafluoride in the presence of 0.5 to 2 moles of hydrogen fluoride per mole of polyester at a temperature in the range of about 50.degree. to 160.degree. C. for a period of about 2 to 24 hours.
RIGHTS OF THE GOVERNMENT
The invention described herein may be manufactured and used by or for the Government of the United States for all governmental purposes without the payment of any royalty.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
3452103 |
Trischler |
Jun 1969 |
|
3492374 |
Le Bleu et al. |
Jan 1970 |
|
3699145 |
Sianesi et al. |
Oct 1972 |
|