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US 6,406,657 B1Granted
Method and apparatus for making a fibrous electret web using a wetting liquid and an aqueous polar liquid
Assignee3M Innovative Properties Company
InventorsPhilip D. Eitzman, Alan D. Rousseau
Life of this patent
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Abstract
A method for imparting an electrostatic charge to a nonwoven fibrous web 20. The fibrous web 20 is wetted with a wetting liquid 24, followed by being saturated with an aqueous polar liquid 30 and drying 31. The resulting dried product is an electret article 43 that could be used as an air filter in, for example, a respirator 50.
Claims46
A method of making a fibrous electret web, which method comprises:
- wetting a fibrous web, which web contains nonconductive polymeric fibers, with a wetting liquid;
- saturating the wetted web in an aqueous polar liquid;
- and then
- substantially drying the web.
1 more element
Dependencies are inferred from the claim text.