| 摘要 |
Liquid-water displacement composition consisting essentially of a normally liquid chlorofluorocarbon having at least two carbon atoms, a boiling point of at least about 28 DEG C., a density of at least about 1.3 grams/cc at 20 DEG C. and a solubility parameter of less than about 8 and such an amount of surfactant dissolved therein as to impart water displacement characteristics to the composition, said surfactant being soluble in a water displacing amount in said normally liquid chlorofluorocarbon and being a tetraalkyl ammonium compound having a water extractability from the composition of not more than 30 weight %, preferably not more than 10 weight %, most preferably not more than 5 weight %, the cationic moiety of the surfactant being of the formula RmN(+)Rn' wherein m is 2 or 3, n is 1 or 2, the sum of m and n is 4, R is C6-18 alkyl and R' is C1-2 alkyl, said composition having an aqueous emulsion separation time of not more than 8 minutes, preferably not more than 5 minutes, and being able to dry a standard lead frame for electronic applications to a moisture level of not more than 8.5 weight %. |
