Electret webs with charge-enhancing additives
Assignee3M Innovative Properties Company
InventorsFuming B. Li, Feng Bai, John M. Sebastian, Marvin E. Jones
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Abstract
Electret webs are presented which include a blend of a thermoplastic resin and a charge-enhancing additive. The charge-enhancing additives include N-substituted amino carbocyclic aromatic materials. 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 an N-substituted amino carbocyclic aromatic material.
An electret filter medium comprising:
- a non-woven microfiber web comprising a blend of:
- a thermoplastic resin;
- and
- a charge-enhancing additive comprising an N-substituted amino carbocyclic aromatic material.
The electret filter medium of claim wherein the N-substituted amino carbocyclic aromatic material comprises the structures (c)-(f):
- or combinations thereof.
A method of preparing an electret web comprising:
- providing a thermoplastic material;
- providing a charge-enhancing additive comprising an N-substituted amino carbocyclic aromatic material;
- hot melt mixing the thermoplastic material and the charge-enhancing additive to yield a thermoplastic blend;
- melt blowing the thermoplastic blend to form a microfiber web;
- and
- electrostatically charging the web.
Dependencies are inferred from the claim text.