Process for producing perfluorocarboxylic acid fluoride
AssigneeShin-Etsu Chemical Co., Ltd.
InventorsMasayuki Oyama, Kazutoshi Munezawa, Hitoshi Kinami
Life of this patent
Estimating the term…
Abstract
A process of producing a perfluorocarboxylic acid fluoride having the formula (1): ##STR1## wherein n is an integer of at least 2, comprising effecting oligomerization of hexafluoropropylene oxide in the presence of an alkali metal fluoride a sulfone or a mixture of a sulfone with an ether having the formula (2): CH.sub.3 O(CH.sub.2 CH.sub.2 O).sub.m CH.sub.3 (2) where m is an integer of 2 to 6. This process makes it possible to improve production yield of hexafluoropropylene oxide oligomers remarkably, and to raise a reaction temperature for the oligomerization, as compared with conventional methods, thereby shortening reaction time therefor.
Claims6
A process of producing a perfluorocarboxylic acid fluoride represented by the following general formula (1):
- ##STR4## wherein n is an integer of at least 2, comprising effecting oligomerization of hexafluoropropylene oxide in the presence of a catalyst and a solvent, wherein said catalyst is an alkali metal fluoride and said solvent is a sulfone or a mixture of a sulfone with an ether expressed by the following general formula (2):
- CH.sub.3 O(CH.sub.2 CH.sub.2 O).sub.m CH.sub.3 (2)
- where m is an integer of 2 to 6.
Dependencies are inferred from the claim text.