Method of dry cleaning fabrics using densified liquid carbon dioxide
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United States of America Patent
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Nov 4, 1997
Grant Date -
N/A
app pub date -
Aug 20, 1996
filing date -
Mar 6, 1995
priority date (Note) -
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Abstract
A method of dry cleaning fabrics using a dry cleaning system is described. The system comprises densified carbon dioxide, preferably in a liquid phase, and a selected surfactant which is soluble in the densified CO.sub.2. The surfactant has a polysiloxane, a branched polyalkylene oxide or a halocarbon group which is a functional CO.sub.2 -philic moiety connected to a CO.sub.2 -phobic functional moiety. The surfactant either exhibits an HLB of less than 15 or has a ratio of siloxyl to substituted siloxyl groups of greater than 0.5:1.
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