Combination surfactant systems for use in carbon dioxide-based cleaning formulations
US6297206A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 23, 2001 |
| Grant date | Oct 2, 2001 |
| Priority date | — |
| Expiry date | Jan 23, 2021 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD06L1/04
- WIPO fieldChemical engineering
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.