Patent ID: 6841091

Claim:
A water-removing dewetting composition, consisting essentially of a solution of between 0.01 and 0.5% by weight of at least one surface-active agent in a mixture of at least one fluorinated solvent and from 2% to 30% by weight of at least one water-immiscible polyfluorinated alcohol of formula: R f —(CH 2 ) n —OH (I) in which n is equal to 1 or 2 and R f represents a linear or branched perfluoroalkyl radical containing from 4 to 8 carbon atoms, wherein said composition does not exhibit a flash point under standard determination conditions (ASTM standard D 3828), further wherein the fluorinated solvent is selected from the group consisting of 1,1,1,3,3-pentafluorobutane, 1,1,1,2,2,4,4-heptafluorobutane, 1,1,1,2,3,4,4,5,5,5-decafluoropentane, 1,1,1,2,2,3,3,4,4-nonafluorohexane, 1H-perfluorohexane, n-perfluorohexane, (perfluorobutyl) ethylene and perfluoro (methylmorpholine); further wherein the surface-active agent is a cationic surface-active agent obtained by reaction of a mono- or dialkylphosphoric acid of formula: (RO) p (HO) 2-p PO 2 H (II) in which p is a number ranging from 1 to 2 and R denotes a linear or branched alkyl radical containing from 1 to 18 carbon atoms, with a quaternary ammonium chloride of formula: R′ 2 N + R″ 2 Cl − (III) in which R′ and R″, which are identical or different, each represent a hydrogen atom or an alkyl or hydroxyalkyl radical containing 1 to 4 carbon atoms, and a fluorinated amine of formula: R f —X—NR 1 R 2 (IV) in which R f represents a linear perfluoroalkyl radical containing from 2 to 20 carbon atoms, X represents a divalent bridge and the symbols R 1 and R 2 , which are identical or different, each represent a hydrogen atom or an alkyl or hydroxyalkyl radical containing 1 to 4 carbon atoms.