Dry cleaning methods and compositions
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United States of America Patent
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Mar 13, 2001
Grant Date -
N/A
app pub date -
Jan 19, 1999
filing date -
Aug 27, 1997
priority date (Note) -
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Abstract
A method for dry-cleaning articles such as fabrics and clothing in carbon dioxide comprises contacting an article to be cleaned with a liquid dry cleaning composition for a time sufficient to clean the fabric. The liquid dry-cleaning composition comprises a mixture of carbon dioxide, a surfactant, and an organic co-solvent. After the contacting step, the article is separated from the liquid dry cleaning composition. The method is preferably carried out at ambient temperature. The surfactant is preferably one that does not contain a CO.sub.2 -philic group. The organic co-solvent is preferably an alkane and has a flash point above 140.degree. F.
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