Liquid/supercritical cleaning with decreased polymer damage
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United States of America Patent
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Dec 6, 1994
Grant Date -
N/A
app pub date -
Jul 13, 1992
filing date -
Jul 13, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention provides a cleaning method in which a solvent such as densified carbon dioxide can be used for rapid and efficient cleaning, but with decreased damage to solid components such as buttons. The method comprises contacting a substrate to be cleaned with a first fluid, removing the first fluid from contact with the substrate while replacing with a second fluid, and recovering the substrate substantially free of the first and second fluids and from the contaminant. The first fluid is a densified gas while the second fluid is a compressed gas. A preferred embodiment of the method includes the use of a pretreatment designed for compatibility with the densified first fluid.
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