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US 4,686,024 AGranted
Novel perfluoro chemicals and polyfluorinated compounds and process for production of the same
AssigneeThe Green Cross Corporation
InventorsKirby V. Scherer, Jr., Taizo Ono, Kouichi Yamanouchi, Kazumasa Yokoyama
Life of this patent
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Abstract
The present invention relates to novel perfluoro chemicals (PFC), particularly perfluorocyclic ethers and polyfluorinated compounds containing a few chlorine atoms and to a method for the preparation thereof.
Claims3
A liquid phase fluorination method for substituting all of the hydrogen atom(s) contained in a partially fluorinated or non-fluorinated compound by fluorine wherein
- (a) the fluorination is carried out at -75.degree. to +100.degree. C. in an inert liquid medium;
- (b) the inert liquid medium is F-hexane or 1,1,2-trichloro- 1,2,2-trifluoroethane or a mixture thereof;
- (c) undiluted F.sub.2 is used;
- (d) the F.sub.2 is maintained in stoichiometric excess at all times, so that the intermediate carbon radicals react with F.sub.2 rather than each other;
- (e) the compound to be fluorinated, diluterd with said inert liquid medium, is metered in slowly with vigorous stirring, so that it is rapidly diluted by the solvent and its concentration is kept low compared to F.sub.2, and so that efficient heat dispersal occurs and
- (f) UV illumination is used to initiate fluorination
- (g) continuing said fluorination until substantial perfluorination has been completed.
4 more elements
Dependencies are inferred from the claim text.