DETAILED DESCRIPTION OF THE INVENTION Except in the operating and comparative examples, or where otherwise explicitly indicated, all numbers in this description indicating amounts of material or conditions of reaction, physical properties of materials and/or use are to be understood as modified by the word "about.
" All amounts are by weight of the composition, unless otherwise specified.
The term "skin" as used herein includes the skin on the body, face and scalp.
The inventive compositions contain fluorocarbons which are fluorinated compounds that may or may not contain heteroatoms such as nitrogen, oxygen, sulfur, or another halogen.
The fluorocarbons of the invention are dense, inert, hydrophobic liquids with a high capacity for dissolving carbon dioxide or oxygen (the more fluorinated the fluorocarbon the higher its capacity for dissolving a gas).
Moreover, for the purpose of the invention fluorocarbons will be selected so that they are liquid (not gas and not solid) at room temperature, i.
e.
their boiling point is higher than 40 C.
and preferably higher than 60 C.
Thus, in practice fluorocarbons of the invention will have at least 6 carbon atoms and preferably 8 to 10 carbon atoms.
Within these conditions, fluorocarbons have generally a low viscosity so that they are pourable like water or fluid oils used as emollients for cosmetic purpose.
Preferably, the fluorocarbons included in the inventive compositions are not charged (i.
e.
, non-ionic), because non-charged fluorocarbons are more inert and also should deliver CO.
sub.
2 better.
The fluorocarbons of the invention can have straight chains (e.
g.
, perfluorooctane, perfluorodecane), or may contain some ring structures (perfluorodecalin), they may contain heteroatoms such as other halogens (perfluorooctylbromide, perfluorodecylbromide, perfluorooctyliodide), nitrogen (perfluorotripropylamine, perfluoro-tributylamine), or hydrogen (bis-(F-butyl)-ethene or F-44E).
Preferably, the fluorocarbon of the invention is a perfluorinated ether (e
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