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US 6,824,718 B2Granted
Process of making a fibrous electret web
Assignee3M Innovative Properties Company
InventorsPhilip D. Eitzman, Alan D. Rousseau
Life of this patent
Estimating the term…
Abstract
A method for imparting an electrostatic charge to a nonwoven fibrous web 20. The fibrous web 20 is contacted with a liquid solution that includes water and a non-aqueous water soluble component, followed by 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.
Claims41
A method of making a fibrous electret web, which method comprises:
- applying a liquid solution that contains water and a nonaqueous water-soluble component to a fibrous fluid-permeable web;
- and then substantially drying the web to create a fibrous fluid-permeable electret web.
Dependencies are inferred from the claim text.