Use of (perfluoroalkyl)ethylenes as cleaning or drying agents, and compositions which can be used for this purpose
AssigneeSociete Atochem
InventorsDaniel Desbiendras, Jean-Jacques Martin, Pascal Michaud
Life of this patent
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Abstract
To replace 1,1,2-trichloro-1,2,2-trifluoroethane (F113) in its applications to the cleaning and drying of solid surfaces, the invention propose to employ a (perfluoroalkyl) ethylene of formula: R.sub.f CH.dbd.CH.sub.2 in which R.sub.f denotes a linear or branched perfluoroalkyl radical containing from 3 to 6 carbon atoms. In contrast to F113, (perfluoroalkyl)ethylenes are not liable to degrade stratospheric ozone.
Claims20
Process for cleaning a solid surface which comprises removing grease or flux residue by contacting said solid surface with an effective amount of (perfluoroalkyl) ethylene of formula:
- R.sub.f CH.dbd.CH.sub.2 (I)
- in which R.sub.f denotes a linear or branched perfluoroalkyl radical containing from 3 to 6 carbon atoms.
Process for cleaning a solid surface which comprises removing grease or flux residue by contacting said solid surface with a mixture of an effective amount of (perfluoroalkyl) ethylene or formula:
- R.sub.f CH.dbd.CH.sub.2 (I)
- in which R.sub.f denotes a linear or branched perfluoroalkyl radical containing from 3 to 6 carbon atoms and an effective amount of at least one organic solvent selected from the group consisting of alcohols, ketones, esters, ethers, acetals and chlorinated hydrocarbons or hydrocarbons.
Method for drying a solid surface comprising removing water from said solid surface by contacting said solid surface with an effective amount of (perfluoroalkyl)ethylene of formula:
- R.sub.f CH.dbd.CH.sub.2 (I)
- in which R.sub.f denotes a linear or branched perfluoroalkyl radical containing from 3 to 6 carbon atoms admixed with an effective amount of at least one surface-active agent.
Dependencies are inferred from the claim text.