Back to results
US 8,790,449 B2Granted
Electret webs with charge-enhancing additives
Assignee3M Innovative Properties Company
InventorsFuming B. Li, John M. Sebastian, Marvin E. Jones, Daniel A. Japuntich
Life of this patent
Estimating the term…
Abstract
Electret webs are presented which include a blend of a thermoplastic resin and a charge-enhancing additive. The charge-enhancing additives include a heterocyclic imide material which is free of fluorinated groups. The webs prepared from the blends may be in the form of films or non-woven fibrous webs. Non-woven microfiber webs are useful as filtration media.
Claims20
An electret web comprising:
- a thermoplastic resin;
- and
- a charge-enhancing additive comprising a heterocyclic imide material which is free of fluorinated groups.
An electret filter medium comprising:
- a non-woven microfiber web comprising a blend of:
- a thermoplastic resin;
- and
- a charge-enhancing additive comprising a heterocyclic imide material which is free of fluorinated groups.
1 more element
A method of preparing an electret web comprising:
- providing a thermoplastic material;
- providing a charge-enhancing additive comprising a heterocyclic imide material which is free of fluorinated groups;
- hot melt mixing the thermoplastic material and the charge-enhancing additive to yield a thermoplastic blend;
- forming a web;
- and
- electrostatically charging the web.
3 more elements
Dependencies are inferred from the claim text.