Combination surfactant systems for use in carbon dioxide-based cleaning formulations
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United States of America Patent
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Mar 13, 2001
Grant Date -
N/A
app pub date -
May 27, 1999
filing date -
May 28, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for dry-cleaning garments or fabrics in carbon dioxide comprises contacting a garment or fabric article to be cleaned with a liquid dry cleaning composition for a time sufficient to clean the article, said liquid dry-cleaning composition comprising a mixture of carbon dioxide, water, a first surfactant, and a second surfactant, and then separating the article from the liquid dry cleaning composition. The first surfactant comprises a CO.sub.2 -philic group covalently joined to a hydrophilic group; and the second surfactant comprising a CO.sub.2 -philic group covalently joined to a lipophilic group. In the alternative, a single surfactant containing all three of a CO.sub.2 -philic group, a lipophilic group, and a hydrophilic group covalently joined to one another may also be employed. Systems useful for carrying out the foregoing are also disclosed.
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