C - Chemistry – Metallurgy – 11 – D
Patent
C - Chemistry, Metallurgy
11
D
134/31
C11D 7/50 (2006.01) C09K 3/30 (2006.01) C11D 17/00 (2006.01) H05K 1/02 (2006.01) C11D 7/26 (2006.01) C11D 7/28 (2006.01) H05K 3/26 (2006.01)
Patent
CA 2327002
A propellant-rich aerosol cleaner for use with electrical circuit boards and electrical connector components includes a solvent having a low or no ozone depletion potential and a propellant. The solvent is present in a concentration of at most about 50 percent by weight and preferably about 40 percent, and the propellant is present in a concentration of at least about 50 percent by weight and preferably about 60 percent, of the cleaner. The cleaner exhibits a cleaning characteristic of about 0.25 milligrams of soil per gram of cleaner delivered and exhibits low to no residual flammability. In one formulation, the solvent is n- propyl bromide and is present in a concentration of about 40 weight percent. In another formulation, the solvent is trichloroethylene and is present in a concentration of about 20 weight percent. An alternate formulation includes a solvent that is a blend of TCE or trans 1,2-dichloroethylene at a concentration of about 7 to 9 percent by weight and HFE at a concentration of about 21 percent by weight. A preferred propellant is tetrafluoroethane, an HFC liquefied gas, in a concentration of about 60 to 80 weight percent.
Finlayson & Singlehurst
Illinois Tool Works Inc.
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